diff --git a/src/init.cpp b/src/init.cpp
index 4119faf96..b28ba592b 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -1,2513 +1,2512 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2016 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #if defined(HAVE_CONFIG_H)
 #include <config/bitcoin-config.h>
 #endif
 
 #include <init.h>
 
 #include <addrman.h>
 #include <amount.h>
 #include <banman.h>
 #include <chain.h>
 #include <chainparams.h>
 #include <checkpoints.h>
 #include <compat/sanity.h>
 #include <config.h>
 #include <consensus/validation.h>
 #include <flatfile.h>
 #include <fs.h>
 #include <httprpc.h>
 #include <httpserver.h>
 #include <index/txindex.h>
 #include <key.h>
 #include <miner.h>
 #include <net.h>
 #include <net_processing.h>
 #include <netbase.h>
 #include <policy/policy.h>
 #include <rpc/blockchain.h>
 #include <rpc/register.h>
 #include <rpc/server.h>
 #include <scheduler.h>
 #include <script/scriptcache.h>
 #include <script/sigcache.h>
 #include <script/standard.h>
 #include <timedata.h>
 #include <torcontrol.h>
 #include <txdb.h>
 #include <txmempool.h>
 #include <ui_interface.h>
 #include <util/moneystr.h>
 #include <util/system.h>
 #include <validation.h>
 #include <validationinterface.h>
 #include <walletinitinterface.h>
 #include <warnings.h>
 
 #include <boost/algorithm/string/classification.hpp>
 #include <boost/algorithm/string/replace.hpp>
 #include <boost/algorithm/string/split.hpp>
-#include <boost/bind.hpp>
 #include <boost/interprocess/sync/file_lock.hpp>
 #include <boost/thread.hpp>
 
 #if ENABLE_ZMQ
 #include <zmq/zmqnotificationinterface.h>
 #endif
 
 #ifndef WIN32
 #include <csignal>
 #endif
 #include <cstdint>
 #include <cstdio>
 #include <memory>
 
 static const bool DEFAULT_PROXYRANDOMIZE = true;
 static const bool DEFAULT_REST_ENABLE = false;
 static const bool DEFAULT_STOPAFTERBLOCKIMPORT = false;
 
 // Dump addresses to banlist.dat every 15 minutes (900s)
 static constexpr int DUMP_BANS_INTERVAL = 60 * 15;
 
 std::unique_ptr<CConnman> g_connman;
 std::unique_ptr<PeerLogicValidation> peerLogic;
 std::unique_ptr<BanMan> g_banman;
 
 #if !(ENABLE_WALLET)
 class DummyWalletInit : public WalletInitInterface {
 public:
     void AddWalletOptions() const override {}
     bool ParameterInteraction() const override { return true; }
     void RegisterRPC(CRPCTable &) const override {}
     bool Verify(const CChainParams &chainParams) const override { return true; }
     bool Open(const CChainParams &chainParams) const override {
         LogPrintf("No wallet support compiled in!\n");
         return true;
     }
     void Start(CScheduler &scheduler) const override {}
     void Flush() const override {}
     void Stop() const override {}
     void Close() const override {}
 };
 
 const WalletInitInterface &g_wallet_init_interface = DummyWalletInit();
 #endif
 
 #if ENABLE_ZMQ
 static CZMQNotificationInterface *pzmqNotificationInterface = nullptr;
 #endif
 
 #ifdef WIN32
 // Win32 LevelDB doesn't use filedescriptors, and the ones used for accessing
 // block files don't count towards the fd_set size limit anyway.
 #define MIN_CORE_FILEDESCRIPTORS 0
 #else
 #define MIN_CORE_FILEDESCRIPTORS 150
 #endif
 
 //////////////////////////////////////////////////////////////////////////////
 //
 // Shutdown
 //
 
 //
 // Thread management and startup/shutdown:
 //
 // The network-processing threads are all part of a thread group created by
 // AppInit() or the Qt main() function.
 //
 // A clean exit happens when StartShutdown() or the SIGTERM signal handler sets
 // fRequestShutdown, which triggers the DetectShutdownThread(), which interrupts
 // the main thread group. DetectShutdownThread() then exits, which causes
 // AppInit() to continue (it .joins the shutdown thread). Shutdown() is then
 // called to clean up database connections, and stop other threads that should
 // only be stopped after the main network-processing threads have exited.
 //
 // Shutdown for Qt is very similar, only it uses a QTimer to detect
 // fRequestShutdown getting set, and then does the normal Qt shutdown thing.
 //
 
 std::atomic<bool> fRequestShutdown(false);
 
 void StartShutdown() {
     fRequestShutdown = true;
 }
 bool ShutdownRequested() {
     return fRequestShutdown;
 }
 
 /**
  * This is a minimally invasive approach to shutdown on LevelDB read errors from
  * the chainstate, while keeping user interface out of the common library, which
  * is shared between bitcoind, and bitcoin-qt and non-server tools.
  */
 class CCoinsViewErrorCatcher final : public CCoinsViewBacked {
 public:
     explicit CCoinsViewErrorCatcher(CCoinsView *view)
         : CCoinsViewBacked(view) {}
     bool GetCoin(const COutPoint &outpoint, Coin &coin) const override {
         try {
             return CCoinsViewBacked::GetCoin(outpoint, coin);
         } catch (const std::runtime_error &e) {
             uiInterface.ThreadSafeMessageBox(
                 _("Error reading from database, shutting down."), "",
                 CClientUIInterface::MSG_ERROR);
             LogPrintf("Error reading from database: %s\n", e.what());
             // Starting the shutdown sequence and returning false to the caller
             // would be interpreted as 'entry not found' (as opposed to unable
             // to read data), and could lead to invalid interpretation. Just
             // exit immediately, as we can't continue anyway, and all writes
             // should be atomic.
             abort();
         }
     }
     // Writes do not need similar protection, as failure to write is handled by
     // the caller.
 };
 
 static std::unique_ptr<CCoinsViewErrorCatcher> pcoinscatcher;
 static std::unique_ptr<ECCVerifyHandle> globalVerifyHandle;
 
 static boost::thread_group threadGroup;
 static CScheduler scheduler;
 
 void Interrupt() {
     InterruptHTTPServer();
     InterruptHTTPRPC();
     InterruptRPC();
     InterruptREST();
     InterruptTorControl();
     InterruptMapPort();
     if (g_connman) {
         g_connman->Interrupt();
     }
     if (g_txindex) {
         g_txindex->Interrupt();
     }
 }
 
 void Shutdown() {
     LogPrintf("%s: In progress...\n", __func__);
     static CCriticalSection cs_Shutdown;
     TRY_LOCK(cs_Shutdown, lockShutdown);
     if (!lockShutdown) {
         return;
     }
 
     /// Note: Shutdown() must be able to handle cases in which initialization
     /// failed part of the way, for example if the data directory was found to
     /// be locked. Be sure that anything that writes files or flushes caches
     /// only does this if the respective module was initialized.
     RenameThread("bitcoin-shutoff");
     g_mempool.AddTransactionsUpdated(1);
 
     StopHTTPRPC();
     StopREST();
     StopRPC();
     StopHTTPServer();
     g_wallet_init_interface.Flush();
     StopMapPort();
 
     // Because these depend on each-other, we make sure that neither can be
     // using the other before destroying them.
     if (peerLogic) {
         UnregisterValidationInterface(peerLogic.get());
     }
     if (g_connman) {
         g_connman->Stop();
     }
     if (g_txindex) {
         g_txindex->Stop();
     }
 
     StopTorControl();
 
     // After everything has been shut down, but before things get flushed, stop
     // the CScheduler/checkqueue threadGroup
     threadGroup.interrupt_all();
     threadGroup.join_all();
 
     // After the threads that potentially access these pointers have been
     // stopped, destruct and reset all to nullptr.
     peerLogic.reset();
     g_connman.reset();
     g_banman.reset();
     g_txindex.reset();
 
     if (g_is_mempool_loaded &&
         gArgs.GetArg("-persistmempool", DEFAULT_PERSIST_MEMPOOL)) {
         DumpMempool();
     }
 
     // FlushStateToDisk generates a ChainStateFlushed callback, which we should
     // avoid missing
     if (pcoinsTip != nullptr) {
         FlushStateToDisk();
     }
 
     // After there are no more peers/RPC left to give us new data which may
     // generate CValidationInterface callbacks, flush them...
     GetMainSignals().FlushBackgroundCallbacks();
 
     // Any future callbacks will be dropped. This should absolutely be safe - if
     // missing a callback results in an unrecoverable situation, unclean
     // shutdown would too. The only reason to do the above flushes is to let the
     // wallet catch up with our current chain to avoid any strange pruning edge
     // cases and make next startup faster by avoiding rescan.
 
     {
         LOCK(cs_main);
         if (pcoinsTip != nullptr) {
             FlushStateToDisk();
         }
         pcoinsTip.reset();
         pcoinscatcher.reset();
         pcoinsdbview.reset();
         pblocktree.reset();
     }
     g_wallet_init_interface.Stop();
 
 #if ENABLE_ZMQ
     if (pzmqNotificationInterface) {
         UnregisterValidationInterface(pzmqNotificationInterface);
         delete pzmqNotificationInterface;
         pzmqNotificationInterface = nullptr;
     }
 #endif
 
 #ifndef WIN32
     try {
         fs::remove(GetPidFile());
     } catch (const fs::filesystem_error &e) {
         LogPrintf("%s: Unable to remove pidfile: %s\n", __func__, e.what());
     }
 #endif
     UnregisterAllValidationInterfaces();
     GetMainSignals().UnregisterBackgroundSignalScheduler();
     GetMainSignals().UnregisterWithMempoolSignals(g_mempool);
     g_wallet_init_interface.Close();
     globalVerifyHandle.reset();
     ECC_Stop();
     LogPrintf("%s: done\n", __func__);
 }
 
 /**
  * Signal handlers are very limited in what they are allowed to do.
  * The execution context the handler is invoked in is not guaranteed,
  * so we restrict handler operations to just touching variables:
  */
 static void HandleSIGTERM(int) {
     fRequestShutdown = true;
 }
 
 static void HandleSIGHUP(int) {
     GetLogger().m_reopen_file = true;
 }
 
 #ifndef WIN32
 static void registerSignalHandler(int signal, void (*handler)(int)) {
     struct sigaction sa;
     sa.sa_handler = handler;
     sigemptyset(&sa.sa_mask);
     sa.sa_flags = 0;
     sigaction(signal, &sa, NULL);
 }
 #endif
 
 static void OnRPCStarted() {
     uiInterface.NotifyBlockTip.connect(&RPCNotifyBlockChange);
 }
 
 static void OnRPCStopped() {
     uiInterface.NotifyBlockTip.disconnect(&RPCNotifyBlockChange);
     RPCNotifyBlockChange(false, nullptr);
     g_best_block_cv.notify_all();
     LogPrint(BCLog::RPC, "RPC stopped.\n");
 }
 
 void SetupServerArgs() {
     const auto defaultBaseParams =
         CreateBaseChainParams(CBaseChainParams::MAIN);
     const auto testnetBaseParams =
         CreateBaseChainParams(CBaseChainParams::TESTNET);
     const auto defaultChainParams = CreateChainParams(CBaseChainParams::MAIN);
     const auto testnetChainParams =
         CreateChainParams(CBaseChainParams::TESTNET);
 
     // Set all of the args and their help
     // When adding new options to the categories, please keep and ensure
     // alphabetical ordering. Do not translate _(...) -help-debug options, Many
     // technical terms, and only a very small audience, so is unnecessary stress
     // to translators.
     gArgs.AddArg("-?", _("Print this help message and exit"), false,
                  OptionsCategory::OPTIONS);
     gArgs.AddArg("-version", _("Print version and exit"), false,
                  OptionsCategory::OPTIONS);
     gArgs.AddArg("-alertnotify=<cmd>",
                  _("Execute command when a relevant alert is received or we "
                    "see a really long fork (%s in cmd is replaced by message)"),
                  false, OptionsCategory::OPTIONS);
     gArgs.AddArg(
         "-assumevalid=<hex>",
         strprintf(
             _("If this block is in the chain assume that it and its ancestors "
               "are valid and potentially skip their script verification (0 to "
               "verify all, default: %s, testnet: %s)"),
             defaultChainParams->GetConsensus().defaultAssumeValid.GetHex(),
             testnetChainParams->GetConsensus().defaultAssumeValid.GetHex()),
         false, OptionsCategory::OPTIONS);
     gArgs.AddArg("-blocksdir=<dir>",
                  _("Specify directory to hold blocks subdirectory for *.dat "
                    "files (default: <datadir>)"),
                  false, OptionsCategory::OPTIONS);
     gArgs.AddArg("-blocknotify=<cmd>",
                  _("Execute command when the best block changes (%s in cmd is "
                    "replaced by block hash)"),
                  false, OptionsCategory::OPTIONS);
     gArgs.AddArg(
         "-blockreconstructionextratxn=<n>",
         strprintf(_("Extra transactions to keep in memory for compact block "
                     "reconstructions (default: %u)"),
                   DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN),
         false, OptionsCategory::OPTIONS);
     gArgs.AddArg(
         "-blocksonly",
         strprintf(_("Whether to operate in a blocks only mode (default: %d)"),
                   DEFAULT_BLOCKSONLY),
         true, OptionsCategory::OPTIONS);
     gArgs.AddArg("-conf=<file>",
                  strprintf(_("Specify configuration file. Relative paths will "
                              "be prefixed by datadir location. (default: %s)"),
                            BITCOIN_CONF_FILENAME),
                  false, OptionsCategory::OPTIONS);
     gArgs.AddArg("-datadir=<dir>", _("Specify data directory"), false,
                  OptionsCategory::OPTIONS);
     gArgs.AddArg(
         "-dbbatchsize",
         strprintf("Maximum database write batch size in bytes (default: %u)",
                   nDefaultDbBatchSize),
         true, OptionsCategory::OPTIONS);
     gArgs.AddArg(
         "-dbcache=<n>",
         strprintf(
             _("Set database cache size in megabytes (%d to %d, default: %d)"),
             nMinDbCache, nMaxDbCache, nDefaultDbCache),
         false, OptionsCategory::OPTIONS);
     gArgs.AddArg(
         "-debuglogfile=<file>",
         strprintf(
             _("Specify location of debug log file. Relative paths will be "
               "prefixed by a net-specific datadir location. (default: %s)"),
             DEFAULT_DEBUGLOGFILE),
         false, OptionsCategory::OPTIONS);
     gArgs.AddArg("-feefilter",
                  strprintf("Tell other nodes to filter invs to us by "
                            "our mempool min fee (default: %d)",
                            DEFAULT_FEEFILTER),
                  true, OptionsCategory::OPTIONS);
     gArgs.AddArg("-finalizationdelay=<n>",
                  strprintf("Set the minimum amount of time to wait between a "
                            "block header reception and the block finalization. "
                            "Unit is seconds (default: %d)",
                            DEFAULT_MIN_FINALIZATION_DELAY),
                  false, OptionsCategory::OPTIONS);
     gArgs.AddArg(
         "-includeconf=<file>",
         _("Specify additional configuration file, relative to the -datadir "
           "path (only useable from configuration file, not command line)"),
         false, OptionsCategory::OPTIONS);
     gArgs.AddArg(
         "-maxreorgdepth=<n>",
         strprintf("Configure at what depth blocks are considered final "
                   "(default: %d). Use -1 to disable.",
                   DEFAULT_MAX_REORG_DEPTH),
         false, OptionsCategory::OPTIONS);
     gArgs.AddArg("-loadblock=<file>",
                  _("Imports blocks from external blk000??.dat file on startup"),
                  false, OptionsCategory::OPTIONS);
     gArgs.AddArg("-maxmempool=<n>",
                  strprintf(_("Keep the transaction memory pool "
                              "below <n> megabytes (default: %u)"),
                            DEFAULT_MAX_MEMPOOL_SIZE),
                  false, OptionsCategory::OPTIONS);
     gArgs.AddArg("-maxorphantx=<n>",
                  strprintf(_("Keep at most <n> unconnectable "
                              "transactions in memory (default: %u)"),
                            DEFAULT_MAX_ORPHAN_TRANSACTIONS),
                  false, OptionsCategory::OPTIONS);
     gArgs.AddArg("-mempoolexpiry=<n>",
                  strprintf(_("Do not keep transactions in the mempool "
                              "longer than <n> hours (default: %u)"),
                            DEFAULT_MEMPOOL_EXPIRY),
                  false, OptionsCategory::OPTIONS);
     gArgs.AddArg(
         "-minimumchainwork=<hex>",
         strprintf(
             "Minimum work assumed to exist on a valid chain in hex "
             "(default: %s, testnet: %s)",
             defaultChainParams->GetConsensus().nMinimumChainWork.GetHex(),
             testnetChainParams->GetConsensus().nMinimumChainWork.GetHex()),
         true, OptionsCategory::OPTIONS);
     gArgs.AddArg(
         "-par=<n>",
         strprintf(_("Set the number of script verification threads (%u to %d, "
                     "0 = auto, <0 = leave that many cores free, default: %d)"),
                   -GetNumCores(), MAX_SCRIPTCHECK_THREADS,
                   DEFAULT_SCRIPTCHECK_THREADS),
         false, OptionsCategory::OPTIONS);
     gArgs.AddArg("-persistmempool",
                  strprintf(_("Whether to save the mempool on shutdown "
                              "and load on restart (default: %u)"),
                            DEFAULT_PERSIST_MEMPOOL),
                  false, OptionsCategory::OPTIONS);
 #ifndef WIN32
     gArgs.AddArg(
         "-pid=<file>",
         strprintf(_("Specify pid file. Relative paths will be prefixed by a "
                     "net-specific datadir location. (default: %s)"),
                   BITCOIN_PID_FILENAME),
         false, OptionsCategory::OPTIONS);
 #endif
     gArgs.AddArg(
         "-prune=<n>",
         strprintf(
             _("Reduce storage requirements by enabling pruning (deleting) of "
               "old blocks. This allows the pruneblockchain RPC to be called to "
               "delete specific blocks, and enables automatic pruning of old "
               "blocks if a target size in MiB is provided. This mode is "
               "incompatible with -txindex and -rescan. "
               "Warning: Reverting this setting requires re-downloading the "
               "entire blockchain. "
               "(default: 0 = disable pruning blocks, 1 = allow manual pruning "
               "via RPC, >%u = automatically prune block files to stay under "
               "the specified target size in MiB)"),
             MIN_DISK_SPACE_FOR_BLOCK_FILES / 1024 / 1024),
         false, OptionsCategory::OPTIONS);
     gArgs.AddArg("-reindex-chainstate",
                  _("Rebuild chain state from the currently indexed blocks"),
                  false, OptionsCategory::OPTIONS);
     gArgs.AddArg("-reindex",
                  _("Rebuild chain state and block index from the blk*.dat "
                    "files on disk"),
                  false, OptionsCategory::OPTIONS);
 #ifndef WIN32
     gArgs.AddArg(
         "-sysperms",
         _("Create new files with system default permissions, instead of umask "
           "077 (only effective with disabled wallet functionality)"),
         false, OptionsCategory::OPTIONS);
 #endif
     gArgs.AddArg("-txindex",
                  strprintf(_("Maintain a full transaction index, used by the "
                              "getrawtransaction rpc call (default: %d)"),
                            DEFAULT_TXINDEX),
                  false, OptionsCategory::OPTIONS);
     gArgs.AddArg("-usecashaddr",
                  _("Use Cash Address for destination encoding instead "
                    "of base58 (activate by default on Jan, 14)"),
                  false, OptionsCategory::OPTIONS);
 
     gArgs.AddArg(
         "-addnode=<ip>",
         _("Add a node to connect to and attempt to keep the connection open "
           "(see the `addnode` RPC command help for more info)"),
         false, OptionsCategory::CONNECTION);
     gArgs.AddArg(
         "-banscore=<n>",
         strprintf(
             _("Threshold for disconnecting misbehaving peers (default: %u)"),
             DEFAULT_BANSCORE_THRESHOLD),
         false, OptionsCategory::CONNECTION);
     gArgs.AddArg("-bantime=<n>",
                  strprintf(_("Number of seconds to keep misbehaving peers from "
                              "reconnecting (default: %u)"),
                            DEFAULT_MISBEHAVING_BANTIME),
                  false, OptionsCategory::CONNECTION);
     gArgs.AddArg("-bind=<addr>",
                  _("Bind to given address and always listen on it. Use "
                    "[host]:port notation for IPv6"),
                  false, OptionsCategory::CONNECTION);
     gArgs.AddArg("-connect=<ip>",
                  _("Connect only to the specified node(s); -connect=0 disables "
                    "automatic connections (the rules for this peer are the "
                    "same as for -addnode)"),
                  false, OptionsCategory::CONNECTION);
     gArgs.AddArg("-discover",
                  _("Discover own IP addresses (default: 1 when listening and "
                    "no -externalip or -proxy)"),
                  false, OptionsCategory::CONNECTION);
     gArgs.AddArg("-dns",
                  _("Allow DNS lookups for -addnode, -seednode and -connect") +
                      " " + strprintf(_("(default: %d)"), DEFAULT_NAME_LOOKUP),
                  false, OptionsCategory::CONNECTION);
     gArgs.AddArg("-dnsseed",
                  _("Query for peer addresses via DNS lookup, if low on "
                    "addresses (default: 1 unless -connect used)"),
                  false, OptionsCategory::CONNECTION);
     gArgs.AddArg("-enablebip61",
                  strprintf(_("Send reject messages per BIP61 (default: %u)"),
                            DEFAULT_ENABLE_BIP61),
                  false, OptionsCategory::CONNECTION);
 
     gArgs.AddArg("-externalip=<ip>", _("Specify your own public address"),
                  false, OptionsCategory::CONNECTION);
     gArgs.AddArg(
         "-forcednsseed",
         strprintf(
             _("Always query for peer addresses via DNS lookup (default: %d)"),
             DEFAULT_FORCEDNSSEED),
         false, OptionsCategory::CONNECTION);
     gArgs.AddArg("-listen",
                  _("Accept connections from outside (default: 1 if no -proxy "
                    "or -connect)"),
                  false, OptionsCategory::CONNECTION);
     gArgs.AddArg(
         "-listenonion",
         strprintf(_("Automatically create Tor hidden service (default: %d)"),
                   DEFAULT_LISTEN_ONION),
         false, OptionsCategory::CONNECTION);
     gArgs.AddArg(
         "-maxconnections=<n>",
         strprintf(_("Maintain at most <n> connections to peers (default: %u)"),
                   DEFAULT_MAX_PEER_CONNECTIONS),
         false, OptionsCategory::CONNECTION);
     gArgs.AddArg("-maxreceivebuffer=<n>",
                  strprintf(_("Maximum per-connection receive buffer, <n>*1000 "
                              "bytes (default: %u)"),
                            DEFAULT_MAXRECEIVEBUFFER),
                  false, OptionsCategory::CONNECTION);
     gArgs.AddArg("-maxsendbuffer=<n>",
                  strprintf(_("Maximum per-connection send buffer, <n>*1000 "
                              "bytes (default: %u)"),
                            DEFAULT_MAXSENDBUFFER),
                  false, OptionsCategory::CONNECTION);
     gArgs.AddArg(
         "-maxtimeadjustment",
         strprintf(_("Maximum allowed median peer time offset adjustment. Local "
                     "perspective of time may be influenced by peers forward or "
                     "backward by this amount. (default: %u seconds)"),
                   DEFAULT_MAX_TIME_ADJUSTMENT),
         false, OptionsCategory::CONNECTION);
     gArgs.AddArg("-onion=<ip:port>",
                  strprintf(_("Use separate SOCKS5 proxy to reach peers via Tor "
                              "hidden services (default: %s)"),
                            "-proxy"),
                  false, OptionsCategory::CONNECTION);
     gArgs.AddArg(
         "-onlynet=<net>",
         _("Only connect to nodes in network <net> (ipv4, ipv6 or onion)"),
         false, OptionsCategory::CONNECTION);
     gArgs.AddArg("-peerbloomfilters",
                  strprintf(_("Support filtering of blocks and transaction with "
                              "bloom filters (default: %d)"),
                            DEFAULT_PEERBLOOMFILTERS),
                  false, OptionsCategory::CONNECTION);
     gArgs.AddArg("-permitbaremultisig",
                  strprintf(_("Relay non-P2SH multisig (default: %d)"),
                            DEFAULT_PERMIT_BAREMULTISIG),
                  false, OptionsCategory::CONNECTION);
     gArgs.AddArg(
         "-port=<port>",
         strprintf(
             _("Listen for connections on <port> (default: %u or testnet: %u)"),
             defaultChainParams->GetDefaultPort(),
             testnetChainParams->GetDefaultPort()),
         false, OptionsCategory::CONNECTION);
     gArgs.AddArg("-proxy=<ip:port>", _("Connect through SOCKS5 proxy"), false,
                  OptionsCategory::CONNECTION);
     gArgs.AddArg(
         "-proxyrandomize",
         strprintf(_("Randomize credentials for every proxy connection. This "
                     "enables Tor stream isolation (default: %d)"),
                   DEFAULT_PROXYRANDOMIZE),
         false, OptionsCategory::CONNECTION);
     gArgs.AddArg(
         "-seednode=<ip>",
         _("Connect to a node to retrieve peer addresses, and disconnect"),
         false, OptionsCategory::CONNECTION);
     gArgs.AddArg("-timeout=<n>",
                  strprintf(_("Specify connection timeout in milliseconds "
                              "(minimum: 1, default: %d)"),
                            DEFAULT_CONNECT_TIMEOUT),
                  false, OptionsCategory::CONNECTION);
     gArgs.AddArg("-torcontrol=<ip>:<port>",
                  strprintf(_("Tor control port to use if onion listening "
                              "enabled (default: %s)"),
                            DEFAULT_TOR_CONTROL),
                  false, OptionsCategory::CONNECTION);
     gArgs.AddArg("-torpassword=<pass>",
                  _("Tor control port password (default: empty)"), false,
                  OptionsCategory::CONNECTION);
 #ifdef USE_UPNP
 #if USE_UPNP
     gArgs.AddArg("-upnp",
                  _("Use UPnP to map the listening port (default: 1 when "
                    "listening and no -proxy)"),
                  false, OptionsCategory::CONNECTION);
 #else
     gArgs.AddArg(
         "-upnp",
         strprintf(_("Use UPnP to map the listening port (default: %u)"), 0),
         false, OptionsCategory::CONNECTION);
 #endif
 #endif
     gArgs.AddArg("-whitebind=<addr>",
                  _("Bind to given address and whitelist peers connecting to "
                    "it. Use [host]:port notation for IPv6"),
                  false, OptionsCategory::CONNECTION);
     gArgs.AddArg("-whitelist=<IP address or network>",
                  _("Whitelist peers connecting from the given IP address (e.g. "
                    "1.2.3.4) or CIDR notated network (e.g. 1.2.3.0/24). Can be "
                    "specified multiple times.") +
                      " " +
                      _("Whitelisted peers cannot be DoS banned and their "
                        "transactions are always relayed, even if they are "
                        "already in the mempool, useful e.g. for a gateway"),
                  false, OptionsCategory::CONNECTION);
     gArgs.AddArg(
         "-maxuploadtarget=<n>",
         strprintf(_("Tries to keep outbound traffic under the given target (in "
                     "MiB per 24h), 0 = no limit (default: %d)"),
                   DEFAULT_MAX_UPLOAD_TARGET),
         false, OptionsCategory::CONNECTION);
 
     g_wallet_init_interface.AddWalletOptions();
 
 #if ENABLE_ZMQ
     gArgs.AddArg("-zmqpubhashblock=<address>",
                  _("Enable publish hash block in <address>"), false,
                  OptionsCategory::ZMQ);
     gArgs.AddArg("-zmqpubhashtx=<address>",
                  _("Enable publish hash transaction in <address>"), false,
                  OptionsCategory::ZMQ);
     gArgs.AddArg("-zmqpubrawblock=<address>",
                  _("Enable publish raw block in <address>"), false,
                  OptionsCategory::ZMQ);
     gArgs.AddArg("-zmqpubrawtx=<address>",
                  _("Enable publish raw transaction in <address>"), false,
                  OptionsCategory::ZMQ);
 #endif
 
     gArgs.AddArg(
         "-checkblocks=<n>",
         strprintf(
             _("How many blocks to check at startup (default: %u, 0 = all)"),
             DEFAULT_CHECKBLOCKS),
         true, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-checklevel=<n>",
                  strprintf(_("How thorough the block verification of "
                              "-checkblocks is (0-4, default: %u)"),
                            DEFAULT_CHECKLEVEL),
                  true, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg(
         "-checkblockindex",
         strprintf("Do a full consistency check for mapBlockIndex, "
                   "setBlockIndexCandidates, chainActive and mapBlocksUnlinked "
                   "occasionally. (default: %u)",
                   defaultChainParams->DefaultConsistencyChecks()),
         true, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-checkmempool=<n>",
                  strprintf("Run checks every <n> transactions (default: %u)",
                            defaultChainParams->DefaultConsistencyChecks()),
                  true, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-checkpoints",
                  strprintf("Only accept block chain matching built-in "
                            "checkpoints (default: %d)",
                            DEFAULT_CHECKPOINTS_ENABLED),
                  true, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-deprecatedrpc=<method>",
                  "Allows deprecated RPC method(s) to be used", true,
                  OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-dropmessagestest=<n>",
                  "Randomly drop 1 of every <n> network messages", true,
                  OptionsCategory::DEBUG_TEST);
     gArgs.AddArg(
         "-stopafterblockimport",
         strprintf("Stop running after importing blocks from disk (default: %d)",
                   DEFAULT_STOPAFTERBLOCKIMPORT),
         true, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-stopatheight",
                  strprintf("Stop running after reaching the given height in "
                            "the main chain (default: %u)",
                            DEFAULT_STOPATHEIGHT),
                  true, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-limitancestorcount=<n>",
                  strprintf("Do not accept transactions if number of in-mempool "
                            "ancestors is <n> or more (default: %u)",
                            DEFAULT_ANCESTOR_LIMIT),
                  true, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg(
         "-limitancestorsize=<n>",
         strprintf("Do not accept transactions whose size with all in-mempool "
                   "ancestors exceeds <n> kilobytes (default: %u)",
                   DEFAULT_ANCESTOR_SIZE_LIMIT),
         true, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg(
         "-limitdescendantcount=<n>",
         strprintf("Do not accept transactions if any ancestor would have <n> "
                   "or more in-mempool descendants (default: %u)",
                   DEFAULT_DESCENDANT_LIMIT),
         true, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg(
         "-limitdescendantsize=<n>",
         strprintf("Do not accept transactions if any ancestor would have more "
                   "than <n> kilobytes of in-mempool descendants (default: %u).",
                   DEFAULT_DESCENDANT_SIZE_LIMIT),
         true, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-addrmantest", "Allows to test address relay on localhost",
                  true, OptionsCategory::DEBUG_TEST);
 
     gArgs.AddArg("-debug=<category>",
                  strprintf(_("Output debugging information (default: %u, "
                              "supplying <category> is optional)"),
                            0) +
                      ". " +
                      _("If <category> is not supplied or if <category> = 1, "
                        "output all debugging information.") +
                      _("<category> can be:") + " " + ListLogCategories() + ".",
                  false, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg(
         "-debugexclude=<category>",
         strprintf(_("Exclude debugging information for a category. Can be used "
                     "in conjunction with -debug=1 to output debug logs for all "
                     "categories except one or more specified categories.")),
         false, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-help-debug",
                  _("Show all debugging options (usage: --help -help-debug)"),
                  false, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg(
         "-logips",
         strprintf(_("Include IP addresses in debug output (default: %d)"),
                   DEFAULT_LOGIPS),
         false, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg(
         "-logtimestamps",
         strprintf(_("Prepend debug output with timestamp (default: %d)"),
                   DEFAULT_LOGTIMESTAMPS),
         false, OptionsCategory::DEBUG_TEST);
 
     gArgs.AddArg(
         "-logtimemicros",
         strprintf("Add microsecond precision to debug timestamps (default: %d)",
                   DEFAULT_LOGTIMEMICROS),
         true, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg(
         "-mocktime=<n>",
         "Replace actual time with <n> seconds since epoch (default: 0)", true,
         OptionsCategory::DEBUG_TEST);
     gArgs.AddArg(
         "-maxsigcachesize=<n>",
         strprintf("Limit size of signature cache to <n> MiB (default: %u)",
                   DEFAULT_MAX_SIG_CACHE_SIZE),
         true, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg(
         "-maxscriptcachesize=<n>",
         strprintf("Limit size of script cache to <n> MiB (default: %u)",
                   DEFAULT_MAX_SCRIPT_CACHE_SIZE),
         true, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-maxtipage=<n>",
                  strprintf("Maximum tip age in seconds to consider node in "
                            "initial block download (default: %u)",
                            DEFAULT_MAX_TIP_AGE),
                  true, OptionsCategory::DEBUG_TEST);
 
     gArgs.AddArg(
         "-printtoconsole",
         _("Send trace/debug info to console instead of debug.log file"), false,
         OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-printpriority",
                  strprintf("Log transaction priority and fee per kB when "
                            "mining blocks (default: %d)",
                            DEFAULT_PRINTPRIORITY),
                  true, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-shrinkdebugfile",
                  _("Shrink debug.log file on client startup (default: 1 when "
                    "no -debug)"),
                  false, OptionsCategory::DEBUG_TEST);
 
     gArgs.AddArg("-uacomment=<cmt>",
                  _("Append comment to the user agent string"), false,
                  OptionsCategory::DEBUG_TEST);
 
     SetupChainParamsBaseOptions();
 
     gArgs.AddArg(
         "-acceptnonstdtxn",
         strprintf(
             "Relay and mine \"non-standard\" transactions (%sdefault: %u)",
             "testnet/regtest only; ", defaultChainParams->RequireStandard()),
         true, OptionsCategory::NODE_RELAY);
     gArgs.AddArg("-excessiveblocksize=<n>",
                  strprintf(_("Do not accept blocks larger than this limit, in "
                              "bytes (default: %d)"),
                            DEFAULT_MAX_BLOCK_SIZE),
                  true, OptionsCategory::NODE_RELAY);
     gArgs.AddArg(
         "-dustrelayfee=<amt>",
         strprintf("Fee rate (in %s/kB) used to defined dust, the value of an "
                   "output such that it will cost about 1/3 of its value in "
                   "fees at this fee rate to spend it. (default: %s)",
                   CURRENCY_UNIT, FormatMoney(DUST_RELAY_TX_FEE)),
         true, OptionsCategory::NODE_RELAY);
     gArgs.AddArg("-limitfreerelay=<n>",
                  strprintf("Continuously rate-limit free transactions to "
                            "<n>*1000 bytes per minute (default: %u)",
                            DEFAULT_LIMITFREERELAY),
                  true, OptionsCategory::NODE_RELAY);
     gArgs.AddArg("-relaypriority",
                  strprintf("Require high priority for relaying free or low-fee "
                            "transactions (default: %d)",
                            DEFAULT_RELAYPRIORITY),
                  true, OptionsCategory::NODE_RELAY);
 
     gArgs.AddArg("-bytespersigop",
                  strprintf(_("Equivalent bytes per sigop in transactions for "
                              "relay and mining (default: %u)"),
                            DEFAULT_BYTES_PER_SIGOP),
                  false, OptionsCategory::NODE_RELAY);
     gArgs.AddArg(
         "-datacarrier",
         strprintf(_("Relay and mine data carrier transactions (default: %d)"),
                   DEFAULT_ACCEPT_DATACARRIER),
         false, OptionsCategory::NODE_RELAY);
     gArgs.AddArg("-datacarriersize",
                  strprintf(_("Maximum size of data in data carrier "
                              "transactions we relay and mine (default: %u)"),
                            MAX_OP_RETURN_RELAY),
                  false, OptionsCategory::NODE_RELAY);
     gArgs.AddArg(
         "-minrelaytxfee=<amt>",
         strprintf(
             _("Fees (in %s/kB) smaller than this are considered zero fee for "
               "relaying, mining and transaction creation (default: %s)"),
             CURRENCY_UNIT, FormatMoney(DEFAULT_MIN_RELAY_TX_FEE_PER_KB)),
         false, OptionsCategory::NODE_RELAY);
     gArgs.AddArg(
         "-whitelistrelay",
         strprintf(_("Accept relayed transactions received from whitelisted "
                     "peers even when not relaying transactions (default: %d)"),
                   DEFAULT_WHITELISTRELAY),
         false, OptionsCategory::NODE_RELAY);
     gArgs.AddArg(
         "-whitelistforcerelay",
         strprintf(_("Force relay of transactions from whitelisted peers even "
                     "if they violate local relay policy (default: %d)"),
                   DEFAULT_WHITELISTFORCERELAY),
         false, OptionsCategory::NODE_RELAY);
 
     // Not sure this really belongs here, but it will do for now.
     // FIXME: This doesn't work anyways.
     gArgs.AddArg("-excessutxocharge=<amt>",
                  strprintf(_("Fees (in %s/kB) to charge per utxo created for "
                              "relaying, and mining (default: %s)"),
                            CURRENCY_UNIT, FormatMoney(DEFAULT_UTXO_FEE)),
                  true, OptionsCategory::NODE_RELAY);
 
     gArgs.AddArg("-blockmaxsize=<n>",
                  strprintf(_("Set maximum block size in bytes (default: %d)"),
                            DEFAULT_MAX_GENERATED_BLOCK_SIZE),
                  false, OptionsCategory::BLOCK_CREATION);
     gArgs.AddArg(
         "-blockprioritypercentage=<n>",
         strprintf(_("Set maximum percentage of a block reserved to "
                     "high-priority/low-fee transactions (default: %d)"),
                   DEFAULT_BLOCK_PRIORITY_PERCENTAGE),
         false, OptionsCategory::BLOCK_CREATION);
     gArgs.AddArg(
         "-blockmintxfee=<amt>",
         strprintf(_("Set lowest fee rate (in %s/kB) for transactions to be "
                     "included in block creation. (default: %s)"),
                   CURRENCY_UNIT, FormatMoney(DEFAULT_BLOCK_MIN_TX_FEE_PER_KB)),
         false, OptionsCategory::BLOCK_CREATION);
 
     gArgs.AddArg("-blockversion=<n>",
                  "Override block version to test forking scenarios", true,
                  OptionsCategory::BLOCK_CREATION);
 
     gArgs.AddArg("-server", _("Accept command line and JSON-RPC commands"),
                  false, OptionsCategory::RPC);
     gArgs.AddArg("-rest",
                  strprintf(_("Accept public REST requests (default: %d)"),
                            DEFAULT_REST_ENABLE),
                  false, OptionsCategory::RPC);
     gArgs.AddArg(
         "-rpcbind=<addr>[:port]",
         _("Bind to given address to listen for JSON-RPC connections. This "
           "option is ignored unless -rpcallowip is also passed. Port is "
           "optional and overrides -rpcport. Use [host]:port notation for IPv6. "
           "This option can be specified multiple times (default: 127.0.0.1 and "
           "::1 i.e., localhost, or if -rpcallowip has been specified, 0.0.0.0 "
           "and :: i.e., all addresses)"),
         false, OptionsCategory::RPC);
     gArgs.AddArg(
         "-rpccookiefile=<loc>",
         _("Location of the auth cookie. Relative paths will be prefixed by a "
           "net-specific datadir location. (default: data dir)"),
         false, OptionsCategory::RPC);
     gArgs.AddArg("-rpcuser=<user>", _("Username for JSON-RPC connections"),
                  false, OptionsCategory::RPC);
     gArgs.AddArg("-rpcpassword=<pw>", _("Password for JSON-RPC connections"),
                  false, OptionsCategory::RPC);
     gArgs.AddArg(
         "-rpcauth=<userpw>",
         _("Username and hashed password for JSON-RPC connections. The field "
           "<userpw> comes in the format: <USERNAME>:<SALT>$<HASH>. A canonical "
           "python script is included in share/rpcuser. The client then "
           "connects normally using the "
           "rpcuser=<USERNAME>/rpcpassword=<PASSWORD> pair of arguments. This "
           "option can be specified multiple times"),
         false, OptionsCategory::RPC);
     gArgs.AddArg(
         "-rpcport=<port>",
         strprintf(_("Listen for JSON-RPC connections on <port> (default: %u or "
                     "testnet: %u)"),
                   defaultBaseParams->RPCPort(), testnetBaseParams->RPCPort()),
         false, OptionsCategory::RPC);
     gArgs.AddArg("-rpcallowip=<ip>",
                  _("Allow JSON-RPC connections from specified source. Valid "
                    "for <ip> are a single IP (e.g. 1.2.3.4), a network/netmask "
                    "(e.g. 1.2.3.4/255.255.255.0) or a network/CIDR (e.g. "
                    "1.2.3.4/24). This option can be specified multiple times"),
                  false, OptionsCategory::RPC);
     gArgs.AddArg(
         "-rpcthreads=<n>",
         strprintf(
             _("Set the number of threads to service RPC calls (default: %d)"),
             DEFAULT_HTTP_THREADS),
         false, OptionsCategory::RPC);
     gArgs.AddArg(
         "-rpccorsdomain=value",
         "Domain from which to accept cross origin requests (browser enforced)",
         false, OptionsCategory::RPC);
 
     gArgs.AddArg("-rpcworkqueue=<n>",
                  strprintf("Set the depth of the work queue to service RPC "
                            "calls (default: %d)",
                            DEFAULT_HTTP_WORKQUEUE),
                  true, OptionsCategory::RPC);
     gArgs.AddArg("-rpcservertimeout=<n>",
                  strprintf("Timeout during HTTP requests (default: %d)",
                            DEFAULT_HTTP_SERVER_TIMEOUT),
                  true, OptionsCategory::RPC);
 
     // Hidden options
     gArgs.AddArg("-rpcssl", "", false, OptionsCategory::HIDDEN);
     gArgs.AddArg("-benchmark", "", false, OptionsCategory::HIDDEN);
     gArgs.AddArg("-h", "", false, OptionsCategory::HIDDEN);
     gArgs.AddArg("-help", "", false, OptionsCategory::HIDDEN);
     gArgs.AddArg("-socks", "", false, OptionsCategory::HIDDEN);
     gArgs.AddArg("-tor", "", false, OptionsCategory::HIDDEN);
     gArgs.AddArg("-debugnet", "", false, OptionsCategory::HIDDEN);
     gArgs.AddArg("-whitelistalwaysrelay", "", false, OptionsCategory::HIDDEN);
     gArgs.AddArg("-blockminsize", "", false, OptionsCategory::HIDDEN);
     gArgs.AddArg("-dbcrashratio", "", false, OptionsCategory::HIDDEN);
     gArgs.AddArg("-forcecompactdb", "", false, OptionsCategory::HIDDEN);
     gArgs.AddArg("-usehd", "", false, OptionsCategory::HIDDEN);
     gArgs.AddArg("-parkdeepreorg", "", false, OptionsCategory::HIDDEN);
     gArgs.AddArg("-replayprotectionactivationtime", "", false,
                  OptionsCategory::HIDDEN);
 
     // TODO remove after the Nov 2019 upgrade
     gArgs.AddArg("-gravitonactivationtime", "", false, OptionsCategory::HIDDEN);
 }
 
 std::string LicenseInfo() {
     const std::string URL_SOURCE_CODE =
         "<https://github.com/Bitcoin-ABC/bitcoin-abc>";
     const std::string URL_WEBSITE = "<https://www.bitcoinabc.org>";
 
     return CopyrightHolders(
                strprintf(_("Copyright (C) %i-%i"), 2009, COPYRIGHT_YEAR) +
                " ") +
            "\n" + "\n" +
            strprintf(_("Please contribute if you find %s useful. "
                        "Visit %s for further information about the software."),
                      PACKAGE_NAME, URL_WEBSITE) +
            "\n" +
            strprintf(_("The source code is available from %s."),
                      URL_SOURCE_CODE) +
            "\n" + "\n" + _("This is experimental software.") + "\n" +
            strprintf(_("Distributed under the MIT software license, see the "
                        "accompanying file %s or %s"),
                      "COPYING", "<https://opensource.org/licenses/MIT>") +
            "\n" + "\n" +
            strprintf(_("This product includes software developed by the "
                        "OpenSSL Project for use in the OpenSSL Toolkit %s and "
                        "cryptographic software written by Eric Young and UPnP "
                        "software written by Thomas Bernard."),
                      "<https://www.openssl.org>") +
            "\n";
 }
 
 static void BlockNotifyCallback(bool initialSync,
                                 const CBlockIndex *pBlockIndex) {
     if (initialSync || !pBlockIndex) {
         return;
     }
 
     std::string strCmd = gArgs.GetArg("-blocknotify", "");
     if (!strCmd.empty()) {
         boost::replace_all(strCmd, "%s", pBlockIndex->GetBlockHash().GetHex());
         std::thread t(runCommand, strCmd);
         // thread runs free
         t.detach();
     }
 }
 
 static bool fHaveGenesis = false;
 static Mutex g_genesis_wait_mutex;
 static std::condition_variable g_genesis_wait_cv;
 
 static void BlockNotifyGenesisWait(bool, const CBlockIndex *pBlockIndex) {
     if (pBlockIndex != nullptr) {
         {
             LOCK(g_genesis_wait_mutex);
             fHaveGenesis = true;
         }
         g_genesis_wait_cv.notify_all();
     }
 }
 
 struct CImportingNow {
     CImportingNow() {
         assert(fImporting == false);
         fImporting = true;
     }
 
     ~CImportingNow() {
         assert(fImporting == true);
         fImporting = false;
     }
 };
 
 // If we're using -prune with -reindex, then delete block files that will be
 // ignored by the reindex.  Since reindexing works by starting at block file 0
 // and looping until a blockfile is missing, do the same here to delete any
 // later block files after a gap. Also delete all rev files since they'll be
 // rewritten by the reindex anyway. This ensures that vinfoBlockFile is in sync
 // with what's actually on disk by the time we start downloading, so that
 // pruning works correctly.
 static void CleanupBlockRevFiles() {
     std::map<std::string, fs::path> mapBlockFiles;
 
     // Glob all blk?????.dat and rev?????.dat files from the blocks directory.
     // Remove the rev files immediately and insert the blk file paths into an
     // ordered map keyed by block file index.
     LogPrintf("Removing unusable blk?????.dat and rev?????.dat files for "
               "-reindex with -prune\n");
     fs::path blocksdir = GetBlocksDir();
     for (fs::directory_iterator it(blocksdir); it != fs::directory_iterator();
          it++) {
         if (fs::is_regular_file(*it) &&
             it->path().filename().string().length() == 12 &&
             it->path().filename().string().substr(8, 4) == ".dat") {
             if (it->path().filename().string().substr(0, 3) == "blk") {
                 mapBlockFiles[it->path().filename().string().substr(3, 5)] =
                     it->path();
             } else if (it->path().filename().string().substr(0, 3) == "rev") {
                 remove(it->path());
             }
         }
     }
 
     // Remove all block files that aren't part of a contiguous set starting at
     // zero by walking the ordered map (keys are block file indices) by keeping
     // a separate counter. Once we hit a gap (or if 0 doesn't exist) start
     // removing block files.
     int nContigCounter = 0;
     for (const std::pair<const std::string, fs::path> &item : mapBlockFiles) {
         if (atoi(item.first) == nContigCounter) {
             nContigCounter++;
             continue;
         }
         remove(item.second);
     }
 }
 
 static void ThreadImport(const Config &config,
                          std::vector<fs::path> vImportFiles) {
     RenameThread("bitcoin-loadblk");
     ScheduleBatchPriority();
 
     {
         CImportingNow imp;
 
         // -reindex
         if (fReindex) {
             int nFile = 0;
             while (true) {
                 FlatFilePos pos(nFile, 0);
                 if (!fs::exists(GetBlockPosFilename(pos))) {
                     // No block files left to reindex
                     break;
                 }
                 FILE *file = OpenBlockFile(pos, true);
                 if (!file) {
                     // This error is logged in OpenBlockFile
                     break;
                 }
                 LogPrintf("Reindexing block file blk%05u.dat...\n",
                           (unsigned int)nFile);
                 LoadExternalBlockFile(config, file, &pos);
                 nFile++;
             }
             pblocktree->WriteReindexing(false);
             fReindex = false;
             LogPrintf("Reindexing finished\n");
             // To avoid ending up in a situation without genesis block, re-try
             // initializing (no-op if reindexing worked):
             LoadGenesisBlock(config.GetChainParams());
         }
 
         // hardcoded $DATADIR/bootstrap.dat
         fs::path pathBootstrap = GetDataDir() / "bootstrap.dat";
         if (fs::exists(pathBootstrap)) {
             FILE *file = fsbridge::fopen(pathBootstrap, "rb");
             if (file) {
                 fs::path pathBootstrapOld = GetDataDir() / "bootstrap.dat.old";
                 LogPrintf("Importing bootstrap.dat...\n");
                 LoadExternalBlockFile(config, file);
                 RenameOver(pathBootstrap, pathBootstrapOld);
             } else {
                 LogPrintf("Warning: Could not open bootstrap file %s\n",
                           pathBootstrap.string());
             }
         }
 
         // -loadblock=
         for (const fs::path &path : vImportFiles) {
             FILE *file = fsbridge::fopen(path, "rb");
             if (file) {
                 LogPrintf("Importing blocks file %s...\n", path.string());
                 LoadExternalBlockFile(config, file);
             } else {
                 LogPrintf("Warning: Could not open blocks file %s\n",
                           path.string());
             }
         }
 
         // scan for better chains in the block chain database, that are not yet
         // connected in the active best chain
         CValidationState state;
         if (!ActivateBestChain(config, state)) {
             LogPrintf("Failed to connect best block (%s)\n",
                       FormatStateMessage(state));
             StartShutdown();
             return;
         }
 
         if (gArgs.GetBoolArg("-stopafterblockimport",
                              DEFAULT_STOPAFTERBLOCKIMPORT)) {
             LogPrintf("Stopping after block import\n");
             StartShutdown();
             return;
         }
     } // End scope of CImportingNow
     if (gArgs.GetArg("-persistmempool", DEFAULT_PERSIST_MEMPOOL)) {
         LoadMempool(config);
     }
     g_is_mempool_loaded = !fRequestShutdown;
 }
 
 /** Sanity checks
  *  Ensure that Bitcoin is running in a usable environment with all
  *  necessary library support.
  */
 static bool InitSanityCheck() {
     if (!ECC_InitSanityCheck()) {
         InitError(
             "Elliptic curve cryptography sanity check failure. Aborting.");
         return false;
     }
 
     if (!glibc_sanity_test() || !glibcxx_sanity_test()) {
         return false;
     }
 
     if (!Random_SanityCheck()) {
         InitError("OS cryptographic RNG sanity check failure. Aborting.");
         return false;
     }
 
     return true;
 }
 
 static bool AppInitServers(Config &config,
                            HTTPRPCRequestProcessor &httpRPCRequestProcessor) {
     RPCServerSignals::OnStarted(&OnRPCStarted);
     RPCServerSignals::OnStopped(&OnRPCStopped);
     if (!InitHTTPServer(config)) {
         return false;
     }
     if (!StartRPC()) {
         return false;
     }
     if (!StartHTTPRPC(config, httpRPCRequestProcessor)) {
         return false;
     }
     if (gArgs.GetBoolArg("-rest", DEFAULT_REST_ENABLE) && !StartREST()) {
         return false;
     }
     if (!StartHTTPServer()) {
         return false;
     }
     return true;
 }
 
 // Parameter interaction based on rules
 void InitParameterInteraction() {
     // when specifying an explicit binding address, you want to listen on it
     // even when -connect or -proxy is specified.
     if (gArgs.IsArgSet("-bind")) {
         if (gArgs.SoftSetBoolArg("-listen", true)) {
             LogPrintf(
                 "%s: parameter interaction: -bind set -> setting -listen=1\n",
                 __func__);
         }
     }
     if (gArgs.IsArgSet("-whitebind")) {
         if (gArgs.SoftSetBoolArg("-listen", true)) {
             LogPrintf("%s: parameter interaction: -whitebind set -> setting "
                       "-listen=1\n",
                       __func__);
         }
     }
 
     if (gArgs.IsArgSet("-connect")) {
         // when only connecting to trusted nodes, do not seed via DNS, or listen
         // by default.
         if (gArgs.SoftSetBoolArg("-dnsseed", false)) {
             LogPrintf("%s: parameter interaction: -connect set -> setting "
                       "-dnsseed=0\n",
                       __func__);
         }
         if (gArgs.SoftSetBoolArg("-listen", false)) {
             LogPrintf("%s: parameter interaction: -connect set -> setting "
                       "-listen=0\n",
                       __func__);
         }
     }
 
     if (gArgs.IsArgSet("-proxy")) {
         // to protect privacy, do not listen by default if a default proxy
         // server is specified.
         if (gArgs.SoftSetBoolArg("-listen", false)) {
             LogPrintf(
                 "%s: parameter interaction: -proxy set -> setting -listen=0\n",
                 __func__);
         }
         // to protect privacy, do not use UPNP when a proxy is set. The user may
         // still specify -listen=1 to listen locally, so don't rely on this
         // happening through -listen below.
         if (gArgs.SoftSetBoolArg("-upnp", false)) {
             LogPrintf(
                 "%s: parameter interaction: -proxy set -> setting -upnp=0\n",
                 __func__);
         }
         // to protect privacy, do not discover addresses by default
         if (gArgs.SoftSetBoolArg("-discover", false)) {
             LogPrintf("%s: parameter interaction: -proxy set -> setting "
                       "-discover=0\n",
                       __func__);
         }
     }
 
     if (!gArgs.GetBoolArg("-listen", DEFAULT_LISTEN)) {
         // do not map ports or try to retrieve public IP when not listening
         // (pointless)
         if (gArgs.SoftSetBoolArg("-upnp", false)) {
             LogPrintf(
                 "%s: parameter interaction: -listen=0 -> setting -upnp=0\n",
                 __func__);
         }
         if (gArgs.SoftSetBoolArg("-discover", false)) {
             LogPrintf(
                 "%s: parameter interaction: -listen=0 -> setting -discover=0\n",
                 __func__);
         }
         if (gArgs.SoftSetBoolArg("-listenonion", false)) {
             LogPrintf("%s: parameter interaction: -listen=0 -> setting "
                       "-listenonion=0\n",
                       __func__);
         }
     }
 
     if (gArgs.IsArgSet("-externalip")) {
         // if an explicit public IP is specified, do not try to find others
         if (gArgs.SoftSetBoolArg("-discover", false)) {
             LogPrintf("%s: parameter interaction: -externalip set -> setting "
                       "-discover=0\n",
                       __func__);
         }
     }
 
     // disable whitelistrelay in blocksonly mode
     if (gArgs.GetBoolArg("-blocksonly", DEFAULT_BLOCKSONLY)) {
         if (gArgs.SoftSetBoolArg("-whitelistrelay", false)) {
             LogPrintf("%s: parameter interaction: -blocksonly=1 -> setting "
                       "-whitelistrelay=0\n",
                       __func__);
         }
     }
 
     // Forcing relay from whitelisted hosts implies we will accept relays from
     // them in the first place.
     if (gArgs.GetBoolArg("-whitelistforcerelay", DEFAULT_WHITELISTFORCERELAY)) {
         if (gArgs.SoftSetBoolArg("-whitelistrelay", true)) {
             LogPrintf("%s: parameter interaction: -whitelistforcerelay=1 -> "
                       "setting -whitelistrelay=1\n",
                       __func__);
         }
     }
 
     // Warn if network-specific options (-addnode, -connect, etc) are
     // specified in default section of config file, but not overridden
     // on the command line or in this network's section of the config file.
     gArgs.WarnForSectionOnlyArgs();
 }
 
 static std::string ResolveErrMsg(const char *const optname,
                                  const std::string &strBind) {
     return strprintf(_("Cannot resolve -%s address: '%s'"), optname, strBind);
 }
 
 void InitLogging() {
     BCLog::Logger &logger = GetLogger();
     logger.m_print_to_console = gArgs.GetBoolArg("-printtoconsole", false);
     logger.m_log_timestamps =
         gArgs.GetBoolArg("-logtimestamps", DEFAULT_LOGTIMESTAMPS);
     logger.m_log_time_micros =
         gArgs.GetBoolArg("-logtimemicros", DEFAULT_LOGTIMEMICROS);
 
     fLogIPs = gArgs.GetBoolArg("-logips", DEFAULT_LOGIPS);
 
     LogPrintf("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
     LogPrintf("%s version %s\n", CLIENT_NAME, FormatFullVersion());
 }
 
 namespace { // Variables internal to initialization process only
 
 int nMaxConnections;
 int nUserMaxConnections;
 int nFD;
 ServiceFlags nLocalServices = ServiceFlags(NODE_NETWORK | NODE_NETWORK_LIMITED);
 } // namespace
 
 [[noreturn]] static void new_handler_terminate() {
     // Rather than throwing std::bad-alloc if allocation fails, terminate
     // immediately to (try to) avoid chain corruption. Since LogPrintf may
     // itself allocate memory, set the handler directly to terminate first.
     std::set_new_handler(std::terminate);
     LogPrintf("Error: Out of memory. Terminating.\n");
 
     // The log was successful, terminate now.
     std::terminate();
 };
 
 bool AppInitBasicSetup() {
 // Step 1: setup
 #ifdef _MSC_VER
     // Turn off Microsoft heap dump noise
     _CrtSetReportMode(_CRT_WARN, _CRTDBG_MODE_FILE);
     _CrtSetReportFile(_CRT_WARN, CreateFileA("NUL", GENERIC_WRITE, 0, nullptr,
                                              OPEN_EXISTING, 0, 0));
     // Disable confusing "helpful" text message on abort, Ctrl-C
     _set_abort_behavior(0, _WRITE_ABORT_MSG | _CALL_REPORTFAULT);
 #endif
 #ifdef WIN32
 // Enable Data Execution Prevention (DEP)
 // Minimum supported OS versions: WinXP SP3, WinVista >= SP1, Win Server 2008
 // A failure is non-critical and needs no further attention!
 #ifndef PROCESS_DEP_ENABLE
 // We define this here, because GCCs winbase.h limits this to _WIN32_WINNT >=
 // 0x0601 (Windows 7), which is not correct. Can be removed, when GCCs winbase.h
 // is fixed!
 #define PROCESS_DEP_ENABLE 0x00000001
 #endif
     typedef BOOL(WINAPI * PSETPROCDEPPOL)(DWORD);
     PSETPROCDEPPOL setProcDEPPol = (PSETPROCDEPPOL)GetProcAddress(
         GetModuleHandleA("Kernel32.dll"), "SetProcessDEPPolicy");
     if (setProcDEPPol != nullptr) {
         setProcDEPPol(PROCESS_DEP_ENABLE);
     }
 #endif
 
     if (!SetupNetworking()) {
         return InitError("Initializing networking failed");
     }
 
 #ifndef WIN32
     if (!gArgs.GetBoolArg("-sysperms", false)) {
         umask(077);
     }
 
     // Clean shutdown on SIGTERM
     registerSignalHandler(SIGTERM, HandleSIGTERM);
     registerSignalHandler(SIGINT, HandleSIGTERM);
 
     // Reopen debug.log on SIGHUP
     registerSignalHandler(SIGHUP, HandleSIGHUP);
 
     // Ignore SIGPIPE, otherwise it will bring the daemon down if the client
     // closes unexpectedly
     signal(SIGPIPE, SIG_IGN);
 #endif
 
     std::set_new_handler(new_handler_terminate);
 
     return true;
 }
 
 bool AppInitParameterInteraction(Config &config) {
     const CChainParams &chainparams = config.GetChainParams();
     // Step 2: parameter interactions
 
     // also see: InitParameterInteraction()
 
     if (!fs::is_directory(GetBlocksDir())) {
         return InitError(
             strprintf(_("Specified blocks directory \"%s\" does not exist.\n"),
                       gArgs.GetArg("-blocksdir", "").c_str()));
     }
 
     // if using block pruning, then disallow txindex
     if (gArgs.GetArg("-prune", 0)) {
         if (gArgs.GetBoolArg("-txindex", DEFAULT_TXINDEX)) {
             return InitError(_("Prune mode is incompatible with -txindex."));
         }
     }
 
     // if space reserved for high priority transactions is misconfigured
     // stop program execution and warn the user with a proper error message
     const int64_t blkprio = gArgs.GetArg("-blockprioritypercentage",
                                          DEFAULT_BLOCK_PRIORITY_PERCENTAGE);
     if (!config.SetBlockPriorityPercentage(blkprio)) {
         return InitError(_("Block priority percentage has to belong to the "
                            "[0..100] interval."));
     }
 
     // -bind and -whitebind can't be set when not listening
     size_t nUserBind =
         gArgs.GetArgs("-bind").size() + gArgs.GetArgs("-whitebind").size();
     if (nUserBind != 0 && !gArgs.GetBoolArg("-listen", DEFAULT_LISTEN)) {
         return InitError(
             "Cannot set -bind or -whitebind together with -listen=0");
     }
 
     // Make sure enough file descriptors are available
     int nBind = std::max(nUserBind, size_t(1));
     nUserMaxConnections =
         gArgs.GetArg("-maxconnections", DEFAULT_MAX_PEER_CONNECTIONS);
     nMaxConnections = std::max(nUserMaxConnections, 0);
 
     // Trim requested connection counts, to fit into system limitations
     nMaxConnections =
         std::max(std::min(nMaxConnections,
                           (int)(FD_SETSIZE - nBind - MIN_CORE_FILEDESCRIPTORS -
                                 MAX_ADDNODE_CONNECTIONS)),
                  0);
     nFD = RaiseFileDescriptorLimit(nMaxConnections + MIN_CORE_FILEDESCRIPTORS +
                                    MAX_ADDNODE_CONNECTIONS);
     if (nFD < MIN_CORE_FILEDESCRIPTORS) {
         return InitError(_("Not enough file descriptors available."));
     }
     nMaxConnections =
         std::min(nFD - MIN_CORE_FILEDESCRIPTORS - MAX_ADDNODE_CONNECTIONS,
                  nMaxConnections);
 
     if (nMaxConnections < nUserMaxConnections) {
         InitWarning(strprintf(_("Reducing -maxconnections from %d to %d, "
                                 "because of system limitations."),
                               nUserMaxConnections, nMaxConnections));
     }
 
     // Step 3: parameter-to-internal-flags
     if (gArgs.IsArgSet("-debug")) {
         // Special-case: if -debug=0/-nodebug is set, turn off debugging
         // messages
         const std::vector<std::string> &categories = gArgs.GetArgs("-debug");
         if (find(categories.begin(), categories.end(), std::string("0")) ==
             categories.end()) {
             for (const auto &cat : categories) {
                 BCLog::LogFlags flag = BCLog::NONE;
                 if (!GetLogCategory(flag, cat)) {
                     InitWarning(
                         strprintf(_("Unsupported logging category %s=%s."),
                                   "-debug", cat));
                     continue;
                 }
                 GetLogger().EnableCategory(flag);
             }
         }
     }
 
     // Now remove the logging categories which were explicitly excluded
     for (const std::string &cat : gArgs.GetArgs("-debugexclude")) {
         BCLog::LogFlags flag = BCLog::NONE;
         if (!GetLogCategory(flag, cat)) {
             InitWarning(strprintf(_("Unsupported logging category %s=%s."),
                                   "-debugexclude", cat));
             continue;
         }
         GetLogger().DisableCategory(flag);
     }
 
     // Check for -debugnet
     if (gArgs.GetBoolArg("-debugnet", false)) {
         InitWarning(
             _("Unsupported argument -debugnet ignored, use -debug=net."));
     }
     // Check for -socks - as this is a privacy risk to continue, exit here
     if (gArgs.IsArgSet("-socks")) {
         return InitError(
             _("Unsupported argument -socks found. Setting SOCKS version isn't "
               "possible anymore, only SOCKS5 proxies are supported."));
     }
     // Check for -tor - as this is a privacy risk to continue, exit here
     if (gArgs.GetBoolArg("-tor", false)) {
         return InitError(_("Unsupported argument -tor found, use -onion."));
     }
 
     if (gArgs.GetBoolArg("-benchmark", false)) {
         InitWarning(
             _("Unsupported argument -benchmark ignored, use -debug=bench."));
     }
 
     if (gArgs.GetBoolArg("-whitelistalwaysrelay", false)) {
         InitWarning(_("Unsupported argument -whitelistalwaysrelay ignored, use "
                       "-whitelistrelay and/or -whitelistforcerelay."));
     }
 
     if (gArgs.IsArgSet("-blockminsize")) {
         InitWarning("Unsupported argument -blockminsize ignored.");
     }
 
     // Checkmempool and checkblockindex default to true in regtest mode
     int ratio = std::min<int>(
         std::max<int>(
             gArgs.GetArg("-checkmempool",
                          chainparams.DefaultConsistencyChecks() ? 1 : 0),
             0),
         1000000);
     if (ratio != 0) {
         g_mempool.setSanityCheck(1.0 / ratio);
     }
     fCheckBlockIndex = gArgs.GetBoolArg("-checkblockindex",
                                         chainparams.DefaultConsistencyChecks());
     fCheckpointsEnabled =
         gArgs.GetBoolArg("-checkpoints", DEFAULT_CHECKPOINTS_ENABLED);
     if (fCheckpointsEnabled) {
         LogPrintf("Checkpoints will be verified.\n");
     } else {
         LogPrintf("Skipping checkpoint verification.\n");
     }
 
     hashAssumeValid = uint256S(
         gArgs.GetArg("-assumevalid",
                      chainparams.GetConsensus().defaultAssumeValid.GetHex()));
     if (!hashAssumeValid.IsNull()) {
         LogPrintf("Assuming ancestors of block %s have valid signatures.\n",
                   hashAssumeValid.GetHex());
     } else {
         LogPrintf("Validating signatures for all blocks.\n");
     }
 
     if (gArgs.IsArgSet("-minimumchainwork")) {
         const std::string minChainWorkStr =
             gArgs.GetArg("-minimumchainwork", "");
         if (!IsHexNumber(minChainWorkStr)) {
             return InitError(strprintf(
                 "Invalid non-hex (%s) minimum chain work value specified",
                 minChainWorkStr));
         }
         nMinimumChainWork = UintToArith256(uint256S(minChainWorkStr));
     } else {
         nMinimumChainWork =
             UintToArith256(chainparams.GetConsensus().nMinimumChainWork);
     }
     LogPrintf("Setting nMinimumChainWork=%s\n", nMinimumChainWork.GetHex());
     if (nMinimumChainWork <
         UintToArith256(chainparams.GetConsensus().nMinimumChainWork)) {
         LogPrintf("Warning: nMinimumChainWork set below default value of %s\n",
                   chainparams.GetConsensus().nMinimumChainWork.GetHex());
     }
 
     // mempool limits
     int64_t nMempoolSizeMax =
         gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000;
     int64_t nMempoolSizeMin =
         gArgs.GetArg("-limitdescendantsize", DEFAULT_DESCENDANT_SIZE_LIMIT) *
         1000 * 40;
     if (nMempoolSizeMax < 0 || nMempoolSizeMax < nMempoolSizeMin) {
         return InitError(strprintf(_("-maxmempool must be at least %d MB"),
                                    std::ceil(nMempoolSizeMin / 1000000.0)));
     }
 
     // -par=0 means autodetect, but nScriptCheckThreads==0 means no concurrency
     nScriptCheckThreads = gArgs.GetArg("-par", DEFAULT_SCRIPTCHECK_THREADS);
     if (nScriptCheckThreads <= 0) {
         nScriptCheckThreads += GetNumCores();
     }
     if (nScriptCheckThreads <= 1) {
         nScriptCheckThreads = 0;
     } else if (nScriptCheckThreads > MAX_SCRIPTCHECK_THREADS) {
         nScriptCheckThreads = MAX_SCRIPTCHECK_THREADS;
     }
 
     // Configure excessive block size.
     const uint64_t nProposedExcessiveBlockSize =
         gArgs.GetArg("-excessiveblocksize", DEFAULT_MAX_BLOCK_SIZE);
     if (!config.SetMaxBlockSize(nProposedExcessiveBlockSize)) {
         return InitError(
             _("Excessive block size must be > 1,000,000 bytes (1MB)"));
     }
 
     // Check blockmaxsize does not exceed maximum accepted block size.
     const uint64_t nProposedMaxGeneratedBlockSize =
         gArgs.GetArg("-blockmaxsize", DEFAULT_MAX_GENERATED_BLOCK_SIZE);
     if (nProposedMaxGeneratedBlockSize > config.GetMaxBlockSize()) {
         auto msg = _("Max generated block size (blockmaxsize) cannot exceed "
                      "the excessive block size (excessiveblocksize)");
         return InitError(msg);
     }
 
     // block pruning; get the amount of disk space (in MiB) to allot for block &
     // undo files
     int64_t nPruneArg = gArgs.GetArg("-prune", 0);
     if (nPruneArg < 0) {
         return InitError(
             _("Prune cannot be configured with a negative value."));
     }
     nPruneTarget = (uint64_t)nPruneArg * 1024 * 1024;
     if (nPruneArg == 1) {
         // manual pruning: -prune=1
         LogPrintf("Block pruning enabled.  Use RPC call "
                   "pruneblockchain(height) to manually prune block and undo "
                   "files.\n");
         nPruneTarget = std::numeric_limits<uint64_t>::max();
         fPruneMode = true;
     } else if (nPruneTarget) {
         if (nPruneTarget < MIN_DISK_SPACE_FOR_BLOCK_FILES) {
             return InitError(
                 strprintf(_("Prune configured below the minimum of %d MiB.  "
                             "Please use a higher number."),
                           MIN_DISK_SPACE_FOR_BLOCK_FILES / 1024 / 1024));
         }
         LogPrintf("Prune configured to target %uMiB on disk for block and undo "
                   "files.\n",
                   nPruneTarget / 1024 / 1024);
         fPruneMode = true;
     }
 
     nConnectTimeout = gArgs.GetArg("-timeout", DEFAULT_CONNECT_TIMEOUT);
     if (nConnectTimeout <= 0) {
         nConnectTimeout = DEFAULT_CONNECT_TIMEOUT;
     }
 
     // Obtain the amount to charge excess UTXO
     if (gArgs.IsArgSet("-excessutxocharge")) {
         Amount n = Amount::zero();
         auto parsed = ParseMoney(gArgs.GetArg("-excessutxocharge", ""), n);
         if (!parsed || Amount::zero() > n) {
             return InitError(AmountErrMsg(
                 "excessutxocharge", gArgs.GetArg("-excessutxocharge", "")));
         }
         config.SetExcessUTXOCharge(n);
     } else {
         config.SetExcessUTXOCharge(DEFAULT_UTXO_FEE);
     }
 
     if (gArgs.IsArgSet("-minrelaytxfee")) {
         Amount n = Amount::zero();
         auto parsed = ParseMoney(gArgs.GetArg("-minrelaytxfee", ""), n);
         if (!parsed || n == Amount::zero()) {
             return InitError(AmountErrMsg("minrelaytxfee",
                                           gArgs.GetArg("-minrelaytxfee", "")));
         }
         // High fee check is done afterward in WalletParameterInteraction()
         ::minRelayTxFee = CFeeRate(n);
     }
 
     // Sanity check argument for min fee for including tx in block
     // TODO: Harmonize which arguments need sanity checking and where that
     // happens.
     if (gArgs.IsArgSet("-blockmintxfee")) {
         Amount n = Amount::zero();
         if (!ParseMoney(gArgs.GetArg("-blockmintxfee", ""), n)) {
             return InitError(AmountErrMsg("blockmintxfee",
                                           gArgs.GetArg("-blockmintxfee", "")));
         }
     }
 
     // Feerate used to define dust.  Shouldn't be changed lightly as old
     // implementations may inadvertently create non-standard transactions.
     if (gArgs.IsArgSet("-dustrelayfee")) {
         Amount n = Amount::zero();
         auto parsed = ParseMoney(gArgs.GetArg("-dustrelayfee", ""), n);
         if (!parsed || Amount::zero() == n) {
             return InitError(AmountErrMsg("dustrelayfee",
                                           gArgs.GetArg("-dustrelayfee", "")));
         }
         dustRelayFee = CFeeRate(n);
     }
 
     fRequireStandard =
         !gArgs.GetBoolArg("-acceptnonstdtxn", !chainparams.RequireStandard());
     if (chainparams.RequireStandard() && !fRequireStandard) {
         return InitError(
             strprintf("acceptnonstdtxn is not currently supported for %s chain",
                       chainparams.NetworkIDString()));
     }
     nBytesPerSigOp = gArgs.GetArg("-bytespersigop", nBytesPerSigOp);
 
     if (!g_wallet_init_interface.ParameterInteraction()) {
         return false;
     }
 
     fIsBareMultisigStd =
         gArgs.GetBoolArg("-permitbaremultisig", DEFAULT_PERMIT_BAREMULTISIG);
     fAcceptDatacarrier =
         gArgs.GetBoolArg("-datacarrier", DEFAULT_ACCEPT_DATACARRIER);
 
     // Option to startup with mocktime set (used for regression testing):
     SetMockTime(gArgs.GetArg("-mocktime", 0)); // SetMockTime(0) is a no-op
 
     if (gArgs.GetBoolArg("-peerbloomfilters", DEFAULT_PEERBLOOMFILTERS)) {
         nLocalServices = ServiceFlags(nLocalServices | NODE_BLOOM);
     }
 
     // Signal Bitcoin Cash support.
     // TODO: remove some time after the hardfork when no longer needed
     // to differentiate the network nodes.
     nLocalServices = ServiceFlags(nLocalServices | NODE_BITCOIN_CASH);
 
     nMaxTipAge = gArgs.GetArg("-maxtipage", DEFAULT_MAX_TIP_AGE);
 
     return true;
 }
 
 static bool LockDataDirectory(bool probeOnly) {
     // Make sure only a single Bitcoin process is using the data directory.
     fs::path datadir = GetDataDir();
     if (!DirIsWritable(datadir)) {
         return InitError(strprintf(
             _("Cannot write to data directory '%s'; check permissions."),
             datadir.string()));
     }
     if (!LockDirectory(datadir, ".lock", probeOnly)) {
         return InitError(strprintf(_("Cannot obtain a lock on data directory "
                                      "%s. %s is probably already running."),
                                    datadir.string(), _(PACKAGE_NAME)));
     }
     return true;
 }
 
 bool AppInitSanityChecks() {
     // Step 4: sanity checks
 
     // Initialize elliptic curve code
     std::string sha256_algo = SHA256AutoDetect();
     LogPrintf("Using the '%s' SHA256 implementation\n", sha256_algo);
     RandomInit();
     ECC_Start();
     globalVerifyHandle.reset(new ECCVerifyHandle());
 
     // Sanity check
     if (!InitSanityCheck()) {
         return InitError(strprintf(
             _("Initialization sanity check failed. %s is shutting down."),
             _(PACKAGE_NAME)));
     }
 
     // Probe the data directory lock to give an early error message, if possible
     // We cannot hold the data directory lock here, as the forking for daemon()
     // hasn't yet happened, and a fork will cause weird behavior to it.
     return LockDataDirectory(true);
 }
 
 bool AppInitLockDataDirectory() {
     // After daemonization get the data directory lock again and hold on to it
     // until exit. This creates a slight window for a race condition to happen,
     // however this condition is harmless: it will at most make us exit without
     // printing a message to console.
     if (!LockDataDirectory(false)) {
         // Detailed error printed inside LockDataDirectory
         return false;
     }
     return true;
 }
 
 bool AppInitMain(Config &config, RPCServer &rpcServer,
                  HTTPRPCRequestProcessor &httpRPCRequestProcessor) {
     // Step 4a: application initialization
     const CChainParams &chainparams = config.GetChainParams();
 
 #ifndef WIN32
     CreatePidFile(GetPidFile(), getpid());
 #endif
 
     BCLog::Logger &logger = GetLogger();
 
     bool default_shrinkdebugfile = logger.DefaultShrinkDebugFile();
     if (gArgs.GetBoolArg("-shrinkdebugfile", default_shrinkdebugfile)) {
         // Do this first since it both loads a bunch of debug.log into memory,
         // and because this needs to happen before any other debug.log printing.
         logger.ShrinkDebugFile();
     }
 
     if (logger.m_print_to_file) {
         if (!logger.OpenDebugLog()) {
             return InitError(strprintf("Could not open debug log file %s",
                                        logger.GetDebugLogPath().string()));
         }
     }
 
     if (!logger.m_log_timestamps) {
         LogPrintf("Startup time: %s\n", FormatISO8601DateTime(GetTime()));
     }
     LogPrintf("Default data directory %s\n", GetDefaultDataDir().string());
     LogPrintf("Using data directory %s\n", GetDataDir().string());
     LogPrintf(
         "Using config file %s\n",
         GetConfigFile(gArgs.GetArg("-conf", BITCOIN_CONF_FILENAME)).string());
     LogPrintf("Using at most %i automatic connections (%i file descriptors "
               "available)\n",
               nMaxConnections, nFD);
 
     // Warn about relative -datadir path.
     if (gArgs.IsArgSet("-datadir") &&
         !fs::path(gArgs.GetArg("-datadir", "")).is_absolute()) {
         LogPrintf("Warning: relative datadir option '%s' specified, which will "
                   "be interpreted relative to the current working directory "
                   "'%s'. This is fragile, because if bitcoin is started in the "
                   "future from a different location, it will be unable to "
                   "locate the current data files. There could also be data "
                   "loss if bitcoin is started while in a temporary "
                   "directory.\n",
                   gArgs.GetArg("-datadir", ""), fs::current_path().string());
     }
 
     InitSignatureCache();
     InitScriptExecutionCache();
 
     LogPrintf("Using %u threads for script verification\n",
               nScriptCheckThreads);
     if (nScriptCheckThreads) {
         for (int i = 0; i < nScriptCheckThreads - 1; i++) {
             threadGroup.create_thread(&ThreadScriptCheck);
         }
     }
 
     // Start the lightweight task scheduler thread
     CScheduler::Function serviceLoop =
-        boost::bind(&CScheduler::serviceQueue, &scheduler);
-    threadGroup.create_thread(boost::bind(&TraceThread<CScheduler::Function>,
-                                          "scheduler", serviceLoop));
+        std::bind(&CScheduler::serviceQueue, &scheduler);
+    threadGroup.create_thread(std::bind(&TraceThread<CScheduler::Function>,
+                                        "scheduler", serviceLoop));
 
     GetMainSignals().RegisterBackgroundSignalScheduler(scheduler);
     GetMainSignals().RegisterWithMempoolSignals(g_mempool);
 
     /**
      * Register RPC commands regardless of -server setting so they will be
      * available in the GUI RPC console even if external calls are disabled.
      */
     RegisterAllRPCCommands(config, rpcServer, tableRPC);
     g_wallet_init_interface.RegisterRPC(tableRPC);
 
     /**
      * Start the RPC server.  It will be started in "warmup" mode and not
      * process calls yet (but it will verify that the server is there and will
      * be ready later).  Warmup mode will be completed when initialisation is
      * finished.
      */
     if (gArgs.GetBoolArg("-server", false)) {
         uiInterface.InitMessage.connect(SetRPCWarmupStatus);
         if (!AppInitServers(config, httpRPCRequestProcessor)) {
             return InitError(
                 _("Unable to start HTTP server. See debug log for details."));
         }
     }
 
     // Step 5: verify wallet database integrity
     if (!g_wallet_init_interface.Verify(chainparams)) {
         return false;
     }
 
     // Step 6: network initialization
 
     // Note that we absolutely cannot open any actual connections
     // until the very end ("start node") as the UTXO/block state
     // is not yet setup and may end up being set up twice if we
     // need to reindex later.
 
     assert(!g_banman);
     g_banman = std::make_unique<BanMan>(
         GetDataDir() / "banlist.dat", config.GetChainParams(), &uiInterface,
         gArgs.GetArg("-bantime", DEFAULT_MISBEHAVING_BANTIME));
     assert(!g_connman);
     g_connman = std::make_unique<CConnman>(
         config, GetRand(std::numeric_limits<uint64_t>::max()),
         GetRand(std::numeric_limits<uint64_t>::max()));
 
     peerLogic.reset(new PeerLogicValidation(
         g_connman.get(), g_banman.get(), scheduler,
         gArgs.GetBoolArg("-enablebip61", DEFAULT_ENABLE_BIP61)));
     RegisterValidationInterface(peerLogic.get());
 
     // sanitize comments per BIP-0014, format user agent and check total size
     std::vector<std::string> uacomments;
     for (const std::string &cmt : gArgs.GetArgs("-uacomment")) {
         if (cmt != SanitizeString(cmt, SAFE_CHARS_UA_COMMENT))
             return InitError(strprintf(
                 _("User Agent comment (%s) contains unsafe characters."), cmt));
         uacomments.push_back(cmt);
     }
     const std::string strSubVersion =
         FormatSubVersion(CLIENT_NAME, CLIENT_VERSION, uacomments);
     if (strSubVersion.size() > MAX_SUBVERSION_LENGTH) {
         return InitError(strprintf(
             _("Total length of network version string (%i) exceeds maximum "
               "length (%i). Reduce the number or size of uacomments."),
             strSubVersion.size(), MAX_SUBVERSION_LENGTH));
     }
 
     if (gArgs.IsArgSet("-onlynet")) {
         std::set<enum Network> nets;
         for (const std::string &snet : gArgs.GetArgs("-onlynet")) {
             enum Network net = ParseNetwork(snet);
             if (net == NET_UNROUTABLE) {
                 return InitError(strprintf(
                     _("Unknown network specified in -onlynet: '%s'"), snet));
             }
             nets.insert(net);
         }
         for (int n = 0; n < NET_MAX; n++) {
             enum Network net = (enum Network)n;
             if (!nets.count(net)) SetLimited(net);
         }
     }
 
     // Check for host lookup allowed before parsing any network related
     // parameters
     fNameLookup = gArgs.GetBoolArg("-dns", DEFAULT_NAME_LOOKUP);
 
     bool proxyRandomize =
         gArgs.GetBoolArg("-proxyrandomize", DEFAULT_PROXYRANDOMIZE);
     // -proxy sets a proxy for all outgoing network traffic
     // -noproxy (or -proxy=0) as well as the empty string can be used to not set
     // a proxy, this is the default
     std::string proxyArg = gArgs.GetArg("-proxy", "");
     SetLimited(NET_ONION);
     if (proxyArg != "" && proxyArg != "0") {
         CService proxyAddr;
         if (!Lookup(proxyArg.c_str(), proxyAddr, 9050, fNameLookup)) {
             return InitError(strprintf(
                 _("Invalid -proxy address or hostname: '%s'"), proxyArg));
         }
 
         proxyType addrProxy = proxyType(proxyAddr, proxyRandomize);
         if (!addrProxy.IsValid()) {
             return InitError(strprintf(
                 _("Invalid -proxy address or hostname: '%s'"), proxyArg));
         }
 
         SetProxy(NET_IPV4, addrProxy);
         SetProxy(NET_IPV6, addrProxy);
         SetProxy(NET_ONION, addrProxy);
         SetNameProxy(addrProxy);
         // by default, -proxy sets onion as reachable, unless -noonion later
         SetLimited(NET_ONION, false);
     }
 
     // -onion can be used to set only a proxy for .onion, or override normal
     // proxy for .onion addresses.
     // -noonion (or -onion=0) disables connecting to .onion entirely. An empty
     // string is used to not override the onion proxy (in which case it defaults
     // to -proxy set above, or none)
     std::string onionArg = gArgs.GetArg("-onion", "");
     if (onionArg != "") {
         if (onionArg == "0") {     // Handle -noonion/-onion=0
             SetLimited(NET_ONION); // set onions as unreachable
         } else {
             CService onionProxy;
             if (!Lookup(onionArg.c_str(), onionProxy, 9050, fNameLookup)) {
                 return InitError(strprintf(
                     _("Invalid -onion address or hostname: '%s'"), onionArg));
             }
             proxyType addrOnion = proxyType(onionProxy, proxyRandomize);
             if (!addrOnion.IsValid()) {
                 return InitError(strprintf(
                     _("Invalid -onion address or hostname: '%s'"), onionArg));
             }
             SetProxy(NET_ONION, addrOnion);
             SetLimited(NET_ONION, false);
         }
     }
 
     // see Step 2: parameter interactions for more information about these
     fListen = gArgs.GetBoolArg("-listen", DEFAULT_LISTEN);
     fDiscover = gArgs.GetBoolArg("-discover", true);
     fRelayTxes = !gArgs.GetBoolArg("-blocksonly", DEFAULT_BLOCKSONLY);
 
     for (const std::string &strAddr : gArgs.GetArgs("-externalip")) {
         CService addrLocal;
         if (Lookup(strAddr.c_str(), addrLocal, GetListenPort(), fNameLookup) &&
             addrLocal.IsValid()) {
             AddLocal(addrLocal, LOCAL_MANUAL);
         } else {
             return InitError(ResolveErrMsg("externalip", strAddr));
         }
     }
 
 #if ENABLE_ZMQ
     pzmqNotificationInterface = CZMQNotificationInterface::Create();
 
     if (pzmqNotificationInterface) {
         RegisterValidationInterface(pzmqNotificationInterface);
     }
 #endif
     // unlimited unless -maxuploadtarget is set
     uint64_t nMaxOutboundLimit = 0;
     uint64_t nMaxOutboundTimeframe = MAX_UPLOAD_TIMEFRAME;
 
     if (gArgs.IsArgSet("-maxuploadtarget")) {
         nMaxOutboundLimit =
             gArgs.GetArg("-maxuploadtarget", DEFAULT_MAX_UPLOAD_TARGET) * 1024 *
             1024;
     }
 
     // Step 7: load block chain
 
     fReindex = gArgs.GetBoolArg("-reindex", false);
     bool fReindexChainState = gArgs.GetBoolArg("-reindex-chainstate", false);
 
     // cache size calculations
     int64_t nTotalCache = (gArgs.GetArg("-dbcache", nDefaultDbCache) << 20);
     // total cache cannot be less than nMinDbCache
     nTotalCache = std::max(nTotalCache, nMinDbCache << 20);
     // total cache cannot be greater than nMaxDbcache
     nTotalCache = std::min(nTotalCache, nMaxDbCache << 20);
     int64_t nBlockTreeDBCache =
         std::min(nTotalCache / 8, nMaxBlockDBCache << 20);
     nTotalCache -= nBlockTreeDBCache;
     int64_t nTxIndexCache =
         std::min(nTotalCache / 8, gArgs.GetBoolArg("-txindex", DEFAULT_TXINDEX)
                                       ? nMaxTxIndexCache << 20
                                       : 0);
     nTotalCache -= nTxIndexCache;
     // use 25%-50% of the remainder for disk cache
     int64_t nCoinDBCache =
         std::min(nTotalCache / 2, (nTotalCache / 4) + (1 << 23));
     // cap total coins db cache
     nCoinDBCache = std::min(nCoinDBCache, nMaxCoinsDBCache << 20);
     nTotalCache -= nCoinDBCache;
     // the rest goes to in-memory cache
     nCoinCacheUsage = nTotalCache;
     int64_t nMempoolSizeMax =
         gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000;
     LogPrintf("Cache configuration:\n");
     LogPrintf("* Using %.1fMiB for block index database\n",
               nBlockTreeDBCache * (1.0 / 1024 / 1024));
     if (gArgs.GetBoolArg("-txindex", DEFAULT_TXINDEX)) {
         LogPrintf("* Using %.1fMiB for transaction index database\n",
                   nTxIndexCache * (1.0 / 1024 / 1024));
     }
     LogPrintf("* Using %.1fMiB for chain state database\n",
               nCoinDBCache * (1.0 / 1024 / 1024));
     LogPrintf("* Using %.1fMiB for in-memory UTXO set (plus up to %.1fMiB of "
               "unused mempool space)\n",
               nCoinCacheUsage * (1.0 / 1024 / 1024),
               nMempoolSizeMax * (1.0 / 1024 / 1024));
 
     int64_t nStart = 0;
     bool fLoaded = false;
     while (!fLoaded && !fRequestShutdown) {
         bool fReset = fReindex;
         std::string strLoadError;
 
         uiInterface.InitMessage(_("Loading block index..."));
 
         LOCK(cs_main);
 
         nStart = GetTimeMillis();
         do {
             try {
                 UnloadBlockIndex();
                 pcoinsTip.reset();
                 pcoinsdbview.reset();
                 pcoinscatcher.reset();
                 pblocktree.reset(
                     new CBlockTreeDB(nBlockTreeDBCache, false, fReset));
 
                 if (fReset) {
                     pblocktree->WriteReindexing(true);
                     // If we're reindexing in prune mode, wipe away unusable
                     // block files and all undo data files
                     if (fPruneMode) {
                         CleanupBlockRevFiles();
                     }
                 }
 
                 if (fRequestShutdown) {
                     break;
                 }
 
                 // LoadBlockIndex will load fHavePruned if we've ever removed a
                 // block file from disk.
                 // Note that it also sets fReindex based on the disk flag!
                 // From here on out fReindex and fReset mean something
                 // different!
                 if (!LoadBlockIndex(config)) {
                     strLoadError = _("Error loading block database");
                     break;
                 }
 
                 // If the loaded chain has a wrong genesis, bail out immediately
                 // (we're likely using a testnet datadir, or the other way
                 // around).
                 if (!mapBlockIndex.empty() &&
                     !LookupBlockIndex(
                         chainparams.GetConsensus().hashGenesisBlock)) {
                     return InitError(_("Incorrect or no genesis block found. "
                                        "Wrong datadir for network?"));
                 }
 
                 // Check for changed -prune state.  What we are concerned about
                 // is a user who has pruned blocks in the past, but is now
                 // trying to run unpruned.
                 if (fHavePruned && !fPruneMode) {
                     strLoadError =
                         _("You need to rebuild the database using -reindex to "
                           "go back to unpruned mode.  This will redownload the "
                           "entire blockchain");
                     break;
                 }
 
                 // At this point blocktree args are consistent with what's on
                 // disk. If we're not mid-reindex (based on disk + args), add a
                 // genesis block on disk (otherwise we use the one already on
                 // disk).
                 // This is called again in ThreadImport after the reindex
                 // completes.
                 if (!fReindex && !LoadGenesisBlock(chainparams)) {
                     strLoadError = _("Error initializing block database");
                     break;
                 }
 
                 // At this point we're either in reindex or we've loaded a
                 // useful block tree into mapBlockIndex!
 
                 pcoinsdbview.reset(new CCoinsViewDB(
                     nCoinDBCache, false, fReset || fReindexChainState));
                 pcoinscatcher.reset(
                     new CCoinsViewErrorCatcher(pcoinsdbview.get()));
 
                 // If necessary, upgrade from older database format.
                 // This is a no-op if we cleared the coinsviewdb with -reindex
                 // or -reindex-chainstate
                 if (!pcoinsdbview->Upgrade()) {
                     strLoadError = _("Error upgrading chainstate database");
                     break;
                 }
 
                 // ReplayBlocks is a no-op if we cleared the coinsviewdb with
                 // -reindex or -reindex-chainstate
                 if (!ReplayBlocks(chainparams.GetConsensus(),
                                   pcoinsdbview.get())) {
                     strLoadError =
                         _("Unable to replay blocks. You will need to rebuild "
                           "the database using -reindex-chainstate.");
                     break;
                 }
 
                 // The on-disk coinsdb is now in a good state, create the cache
                 pcoinsTip.reset(new CCoinsViewCache(pcoinscatcher.get()));
 
                 bool is_coinsview_empty = fReset || fReindexChainState ||
                                           pcoinsTip->GetBestBlock().IsNull();
                 if (!is_coinsview_empty) {
                     // LoadChainTip sets chainActive based on pcoinsTip's best
                     // block
                     if (!LoadChainTip(config)) {
                         strLoadError = _("Error initializing block database");
                         break;
                     }
                     assert(chainActive.Tip() != nullptr);
                 }
 
                 if (!fReset) {
                     // Note that RewindBlockIndex MUST run even if we're about
                     // to -reindex-chainstate. It both disconnects blocks based
                     // on chainActive, and drops block data in mapBlockIndex
                     // based on lack of available witness data.
                     uiInterface.InitMessage(_("Rewinding blocks..."));
                     if (!RewindBlockIndex(config)) {
                         strLoadError = _("Unable to rewind the database to a "
                                          "pre-fork state. You will need to "
                                          "redownload the blockchain");
                         break;
                     }
                 }
 
                 if (!is_coinsview_empty) {
                     uiInterface.InitMessage(_("Verifying blocks..."));
                     if (fHavePruned &&
                         gArgs.GetArg("-checkblocks", DEFAULT_CHECKBLOCKS) >
                             MIN_BLOCKS_TO_KEEP) {
                         LogPrintf(
                             "Prune: pruned datadir may not have more than %d "
                             "blocks; only checking available blocks\n",
                             MIN_BLOCKS_TO_KEEP);
                     }
 
                     CBlockIndex *tip = chainActive.Tip();
                     RPCNotifyBlockChange(true, tip);
                     if (tip && tip->nTime >
                                    GetAdjustedTime() + MAX_FUTURE_BLOCK_TIME) {
                         strLoadError = _(
                             "The block database contains a block which appears "
                             "to be from the future. This may be due to your "
                             "computer's date and time being set incorrectly. "
                             "Only rebuild the block database if you are sure "
                             "that your computer's date and time are correct");
                         break;
                     }
 
                     if (!CVerifyDB().VerifyDB(
                             config, pcoinsdbview.get(),
                             gArgs.GetArg("-checklevel", DEFAULT_CHECKLEVEL),
                             gArgs.GetArg("-checkblocks",
                                          DEFAULT_CHECKBLOCKS))) {
                         strLoadError = _("Corrupted block database detected");
                         break;
                     }
                 }
             } catch (const std::exception &e) {
                 LogPrintf("%s\n", e.what());
                 strLoadError = _("Error opening block database");
                 break;
             }
 
             fLoaded = true;
         } while (false);
 
         if (!fLoaded && !fRequestShutdown) {
             // first suggest a reindex
             if (!fReset) {
                 bool fRet = uiInterface.ThreadSafeQuestion(
                     strLoadError + ".\n\n" +
                         _("Do you want to rebuild the block database now?"),
                     strLoadError + ".\nPlease restart with -reindex or "
                                    "-reindex-chainstate to recover.",
                     "",
                     CClientUIInterface::MSG_ERROR |
                         CClientUIInterface::BTN_ABORT);
                 if (fRet) {
                     fReindex = true;
                     fRequestShutdown = false;
                 } else {
                     LogPrintf("Aborted block database rebuild. Exiting.\n");
                     return false;
                 }
             } else {
                 return InitError(strLoadError);
             }
         }
     }
 
     // As LoadBlockIndex can take several minutes, it's possible the user
     // requested to kill the GUI during the last operation. If so, exit.
     // As the program has not fully started yet, Shutdown() is possibly
     // overkill.
     if (fRequestShutdown) {
         LogPrintf("Shutdown requested. Exiting.\n");
         return false;
     }
     if (fLoaded) {
         LogPrintf(" block index %15dms\n", GetTimeMillis() - nStart);
     }
 
     // Encoded addresses using cashaddr instead of base58.
     // We do this by default to avoid confusion with BTC addresses.
     config.SetCashAddrEncoding(gArgs.GetBoolArg("-usecashaddr", true));
 
     // Step 8: load indexers
     if (gArgs.GetBoolArg("-txindex", DEFAULT_TXINDEX)) {
         g_txindex = std::make_unique<TxIndex>(nTxIndexCache, false, fReindex);
         g_txindex->Start();
     }
 
     // Step 9: load wallet
     if (!g_wallet_init_interface.Open(chainparams)) {
         return false;
     }
 
     // Step 10: data directory maintenance
 
     // if pruning, unset the service bit and perform the initial blockstore
     // prune after any wallet rescanning has taken place.
     if (fPruneMode) {
         LogPrintf("Unsetting NODE_NETWORK on prune mode\n");
         nLocalServices = ServiceFlags(nLocalServices & ~NODE_NETWORK);
         if (!fReindex) {
             uiInterface.InitMessage(_("Pruning blockstore..."));
             PruneAndFlush();
         }
     }
 
     // Step 11: import blocks
     if (!CheckDiskSpace(GetDataDir())) {
         InitError(
             strprintf(_("Error: Disk space is low for %s"), GetDataDir()));
         return false;
     }
     if (!CheckDiskSpace(GetBlocksDir())) {
         InitError(
             strprintf(_("Error: Disk space is low for %s"), GetBlocksDir()));
         return false;
     }
 
     // Either install a handler to notify us when genesis activates, or set
     // fHaveGenesis directly.
     // No locking, as this happens before any background thread is started.
     if (chainActive.Tip() == nullptr) {
         uiInterface.NotifyBlockTip.connect(BlockNotifyGenesisWait);
     } else {
         fHaveGenesis = true;
     }
 
     if (gArgs.IsArgSet("-blocknotify")) {
         uiInterface.NotifyBlockTip.connect(BlockNotifyCallback);
     }
 
     std::vector<fs::path> vImportFiles;
     for (const std::string &strFile : gArgs.GetArgs("-loadblock")) {
         vImportFiles.push_back(strFile);
     }
 
     threadGroup.create_thread(
-        boost::bind(&ThreadImport, std::ref(config), vImportFiles));
+        std::bind(&ThreadImport, std::ref(config), vImportFiles));
 
     // Wait for genesis block to be processed
     {
         WAIT_LOCK(g_genesis_wait_mutex, lock);
         // We previously could hang here if StartShutdown() is called prior to
         // ThreadImport getting started, so instead we just wait on a timer to
         // check ShutdownRequested() regularly.
         while (!fHaveGenesis && !ShutdownRequested()) {
             g_genesis_wait_cv.wait_for(lock, std::chrono::milliseconds(500));
         }
         uiInterface.NotifyBlockTip.disconnect(BlockNotifyGenesisWait);
     }
 
     if (ShutdownRequested()) {
         return false;
     }
 
     // Step 12: start node
 
     int chain_active_height;
 
     //// debug print
     {
         LOCK(cs_main);
         LogPrintf("mapBlockIndex.size() = %u\n", mapBlockIndex.size());
         chain_active_height = chainActive.Height();
     }
     LogPrintf("nBestHeight = %d\n", chain_active_height);
 
     if (gArgs.GetBoolArg("-listenonion", DEFAULT_LISTEN_ONION)) {
         StartTorControl();
     }
 
     Discover();
 
     // Map ports with UPnP
     if (gArgs.GetBoolArg("-upnp", DEFAULT_UPNP)) {
         StartMapPort();
     }
 
     CConnman::Options connOptions;
     connOptions.nLocalServices = nLocalServices;
     connOptions.nMaxConnections = nMaxConnections;
     connOptions.nMaxOutbound =
         std::min(MAX_OUTBOUND_CONNECTIONS, connOptions.nMaxConnections);
     connOptions.nMaxAddnode = MAX_ADDNODE_CONNECTIONS;
     connOptions.nMaxFeeler = 1;
     connOptions.nBestHeight = chain_active_height;
     connOptions.uiInterface = &uiInterface;
     connOptions.m_banman = g_banman.get();
     connOptions.m_msgproc = peerLogic.get();
     connOptions.nSendBufferMaxSize =
         1000 * gArgs.GetArg("-maxsendbuffer", DEFAULT_MAXSENDBUFFER);
     connOptions.nReceiveFloodSize =
         1000 * gArgs.GetArg("-maxreceivebuffer", DEFAULT_MAXRECEIVEBUFFER);
     connOptions.m_added_nodes = gArgs.GetArgs("-addnode");
 
     connOptions.nMaxOutboundTimeframe = nMaxOutboundTimeframe;
     connOptions.nMaxOutboundLimit = nMaxOutboundLimit;
 
     for (const std::string &strBind : gArgs.GetArgs("-bind")) {
         CService addrBind;
         if (!Lookup(strBind.c_str(), addrBind, GetListenPort(), false)) {
             return InitError(ResolveErrMsg("bind", strBind));
         }
         connOptions.vBinds.push_back(addrBind);
     }
 
     for (const std::string &strBind : gArgs.GetArgs("-whitebind")) {
         CService addrBind;
         if (!Lookup(strBind.c_str(), addrBind, 0, false)) {
             return InitError(ResolveErrMsg("whitebind", strBind));
         }
         if (addrBind.GetPort() == 0) {
             return InitError(strprintf(
                 _("Need to specify a port with -whitebind: '%s'"), strBind));
         }
         connOptions.vWhiteBinds.push_back(addrBind);
     }
 
     for (const auto &net : gArgs.GetArgs("-whitelist")) {
         CSubNet subnet;
         LookupSubNet(net.c_str(), subnet);
         if (!subnet.IsValid()) {
             return InitError(strprintf(
                 _("Invalid netmask specified in -whitelist: '%s'"), net));
         }
         connOptions.vWhitelistedRange.push_back(subnet);
     }
 
     connOptions.vSeedNodes = gArgs.GetArgs("-seednode");
 
     // Initiate outbound connections unless connect=0
     connOptions.m_use_addrman_outgoing = !gArgs.IsArgSet("-connect");
     if (!connOptions.m_use_addrman_outgoing) {
         const auto connect = gArgs.GetArgs("-connect");
         if (connect.size() != 1 || connect[0] != "0") {
             connOptions.m_specified_outgoing = connect;
         }
     }
     if (!g_connman->Start(scheduler, connOptions)) {
         return false;
     }
 
     // Step 13: finished
 
     SetRPCWarmupFinished();
     uiInterface.InitMessage(_("Done loading"));
 
     g_wallet_init_interface.Start(scheduler);
 
     scheduler.scheduleEvery(
         [] {
             g_banman->DumpBanlist();
             return true;
         },
         DUMP_BANS_INTERVAL * 1000);
 
     return true;
 }
diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
index b8cd5e8a4..76959d1e4 100644
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -1,1340 +1,1342 @@
 // Copyright (c) 2011-2016 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #if defined(HAVE_CONFIG_H)
 #include <config/bitcoin-config.h>
 #endif
 
 #include <qt/bitcoingui.h>
 
 #include <chain.h>
 #include <chainparams.h>
 #include <config.h>
 #include <init.h>
 #include <interfaces/handler.h>
 #include <interfaces/node.h>
 #include <qt/bitcoinunits.h>
 #include <qt/clientmodel.h>
 #include <qt/guiconstants.h>
 #include <qt/guiutil.h>
 #ifdef Q_OS_MAC
 #include <qt/macdockiconhandler.h>
 #endif
 #include <qt/modaloverlay.h>
 #include <qt/networkstyle.h>
 #include <qt/notificator.h>
 #include <qt/openuridialog.h>
 #include <qt/optionsdialog.h>
 #include <qt/optionsmodel.h>
 #include <qt/platformstyle.h>
 #include <qt/rpcconsole.h>
 #include <qt/utilitydialog.h>
 #ifdef ENABLE_WALLET
 #include <qt/walletframe.h>
 #include <qt/walletmodel.h>
 #include <qt/walletview.h>
 #endif // ENABLE_WALLET
 #include <ui_interface.h>
 #include <util/system.h>
 
 #include <QAction>
 #include <QApplication>
 #include <QComboBox>
 #include <QDateTime>
 #include <QDesktopWidget>
 #include <QDragEnterEvent>
 #include <QListWidget>
 #include <QMenuBar>
 #include <QMessageBox>
 #include <QMimeData>
 #include <QProgressDialog>
 #include <QSettings>
 #include <QShortcut>
 #include <QStackedWidget>
 #include <QStatusBar>
 #include <QStyle>
 #include <QTimer>
 #include <QToolBar>
 #include <QUrlQuery>
 #include <QVBoxLayout>
 
 #include <iostream>
 
 const std::string BitcoinGUI::DEFAULT_UIPLATFORM =
 #if defined(Q_OS_MAC)
     "macosx"
 #elif defined(Q_OS_WIN)
     "windows"
 #else
     "other"
 #endif
     ;
 
 BitcoinGUI::BitcoinGUI(interfaces::Node &node, const Config *configIn,
                        const PlatformStyle *_platformStyle,
                        const NetworkStyle *networkStyle, QWidget *parent)
     : QMainWindow(parent), enableWallet(false), m_node(node),
       platformStyle(_platformStyle), config(configIn) {
     QSettings settings;
     if (!restoreGeometry(settings.value("MainWindowGeometry").toByteArray())) {
         // Restore failed (perhaps missing setting), center the window
         move(QApplication::desktop()->availableGeometry().center() -
              frameGeometry().center());
     }
 
     QString windowTitle = tr(PACKAGE_NAME) + " - ";
 #ifdef ENABLE_WALLET
     enableWallet = WalletModel::isWalletEnabled();
 #endif // ENABLE_WALLET
     if (enableWallet) {
         windowTitle += tr("Wallet");
     } else {
         windowTitle += tr("Node");
     }
     windowTitle += " " + networkStyle->getTitleAddText();
 #ifndef Q_OS_MAC
     QApplication::setWindowIcon(networkStyle->getTrayAndWindowIcon());
     setWindowIcon(networkStyle->getTrayAndWindowIcon());
 #else
     MacDockIconHandler::instance()->setIcon(networkStyle->getAppIcon());
 #endif
     setWindowTitle(windowTitle);
 
     rpcConsole = new RPCConsole(node, _platformStyle, 0);
     helpMessageDialog = new HelpMessageDialog(node, this, false);
 #ifdef ENABLE_WALLET
     if (enableWallet) {
         /** Create wallet frame and make it the central widget */
         walletFrame = new WalletFrame(_platformStyle, this);
         setCentralWidget(walletFrame);
     } else
 #endif // ENABLE_WALLET
     {
         /**
          * When compiled without wallet or -disablewallet is provided,  the
          * central widget is the rpc console.
          */
         setCentralWidget(rpcConsole);
     }
 
     // Accept D&D of URIs
     setAcceptDrops(true);
 
     // Create actions for the toolbar, menu bar and tray/dock icon
     // Needs walletFrame to be initialized
     createActions();
 
     // Create application menu bar
     createMenuBar();
 
     // Create the toolbars
     createToolBars();
 
     // Create system tray icon and notification
     createTrayIcon(networkStyle);
 
     // Create status bar
     statusBar();
 
     // Disable size grip because it looks ugly and nobody needs it
     statusBar()->setSizeGripEnabled(false);
 
     // Status bar notification icons
     QFrame *frameBlocks = new QFrame();
     frameBlocks->setContentsMargins(0, 0, 0, 0);
     frameBlocks->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Preferred);
     QHBoxLayout *frameBlocksLayout = new QHBoxLayout(frameBlocks);
     frameBlocksLayout->setContentsMargins(3, 0, 3, 0);
     frameBlocksLayout->setSpacing(3);
     unitDisplayControl = new UnitDisplayStatusBarControl(platformStyle);
     labelWalletEncryptionIcon = new QLabel();
     labelWalletHDStatusIcon = new QLabel();
     connectionsControl = new GUIUtil::ClickableLabel();
     labelBlocksIcon = new GUIUtil::ClickableLabel();
     if (enableWallet) {
         frameBlocksLayout->addStretch();
         frameBlocksLayout->addWidget(unitDisplayControl);
         frameBlocksLayout->addStretch();
         frameBlocksLayout->addWidget(labelWalletEncryptionIcon);
         frameBlocksLayout->addWidget(labelWalletHDStatusIcon);
     }
     frameBlocksLayout->addStretch();
     frameBlocksLayout->addWidget(connectionsControl);
     frameBlocksLayout->addStretch();
     frameBlocksLayout->addWidget(labelBlocksIcon);
     frameBlocksLayout->addStretch();
 
     // Progress bar and label for blocks download
     progressBarLabel = new QLabel();
     progressBarLabel->setVisible(false);
     progressBar = new GUIUtil::ProgressBar();
     progressBar->setAlignment(Qt::AlignCenter);
     progressBar->setVisible(false);
 
     // Override style sheet for progress bar for styles that have a segmented
     // progress bar, as they make the text unreadable (workaround for issue
     // #1071)
     // See https://doc.qt.io/qt-5/gallery.html
     QString curStyle = QApplication::style()->metaObject()->className();
     if (curStyle == "QWindowsStyle" || curStyle == "QWindowsXPStyle") {
         progressBar->setStyleSheet(
             "QProgressBar { background-color: #e8e8e8; border: 1px solid grey; "
             "border-radius: 7px; padding: 1px; text-align: center; } "
             "QProgressBar::chunk { background: QLinearGradient(x1: 0, y1: 0, "
             "x2: 1, y2: 0, stop: 0 #FF8000, stop: 1 orange); border-radius: "
             "7px; margin: 0px; }");
     }
 
     statusBar()->addWidget(progressBarLabel);
     statusBar()->addWidget(progressBar);
     statusBar()->addPermanentWidget(frameBlocks);
 
     // Install event filter to be able to catch status tip events
     // (QEvent::StatusTip)
     this->installEventFilter(this);
 
     // Initially wallet actions should be disabled
     setWalletActionsEnabled(false);
 
     // Subscribe to notifications from core
     subscribeToCoreSignals();
 
     connect(connectionsControl, SIGNAL(clicked(QPoint)), this,
             SLOT(toggleNetworkActive()));
 
     modalOverlay = new ModalOverlay(this->centralWidget());
 #ifdef ENABLE_WALLET
     if (enableWallet) {
         connect(walletFrame, SIGNAL(requestedSyncWarningInfo()), this,
                 SLOT(showModalOverlay()));
         connect(labelBlocksIcon, SIGNAL(clicked(QPoint)), this,
                 SLOT(showModalOverlay()));
         connect(progressBar, SIGNAL(clicked(QPoint)), this,
                 SLOT(showModalOverlay()));
     }
 #endif
 }
 
 BitcoinGUI::~BitcoinGUI() {
     // Unsubscribe from notifications from core
     unsubscribeFromCoreSignals();
 
     QSettings settings;
     settings.setValue("MainWindowGeometry", saveGeometry());
     // Hide tray icon, as deleting will let it linger until quit (on Ubuntu)
     if (trayIcon) {
         trayIcon->hide();
     }
 #ifdef Q_OS_MAC
     delete appMenuBar;
     MacDockIconHandler::cleanup();
 #endif
 
     delete rpcConsole;
 }
 
 void BitcoinGUI::createActions() {
     QActionGroup *tabGroup = new QActionGroup(this);
 
     overviewAction =
         new QAction(platformStyle->SingleColorIcon(":/icons/overview"),
                     tr("&Overview"), this);
     overviewAction->setStatusTip(tr("Show general overview of wallet"));
     overviewAction->setToolTip(overviewAction->statusTip());
     overviewAction->setCheckable(true);
     overviewAction->setShortcut(QKeySequence(Qt::ALT + Qt::Key_1));
     tabGroup->addAction(overviewAction);
 
     sendCoinsAction = new QAction(
         platformStyle->SingleColorIcon(":/icons/send"), tr("&Send"), this);
     sendCoinsAction->setStatusTip(tr("Send coins to a Bitcoin address"));
     sendCoinsAction->setToolTip(sendCoinsAction->statusTip());
     sendCoinsAction->setCheckable(true);
     sendCoinsAction->setShortcut(QKeySequence(Qt::ALT + Qt::Key_2));
     tabGroup->addAction(sendCoinsAction);
 
     sendCoinsMenuAction =
         new QAction(platformStyle->TextColorIcon(":/icons/send"),
                     sendCoinsAction->text(), this);
     sendCoinsMenuAction->setStatusTip(sendCoinsAction->statusTip());
     sendCoinsMenuAction->setToolTip(sendCoinsMenuAction->statusTip());
 
     receiveCoinsAction = new QAction(
         platformStyle->SingleColorIcon(":/icons/receiving_addresses"),
         tr("&Receive"), this);
     receiveCoinsAction->setStatusTip(
         tr("Request payments (generates QR codes and %1: URIs)")
             .arg(QString::fromStdString(
                 config->GetChainParams().CashAddrPrefix())));
     receiveCoinsAction->setToolTip(receiveCoinsAction->statusTip());
     receiveCoinsAction->setCheckable(true);
     receiveCoinsAction->setShortcut(QKeySequence(Qt::ALT + Qt::Key_3));
     tabGroup->addAction(receiveCoinsAction);
 
     receiveCoinsMenuAction =
         new QAction(platformStyle->TextColorIcon(":/icons/receiving_addresses"),
                     receiveCoinsAction->text(), this);
     receiveCoinsMenuAction->setStatusTip(receiveCoinsAction->statusTip());
     receiveCoinsMenuAction->setToolTip(receiveCoinsMenuAction->statusTip());
 
     historyAction =
         new QAction(platformStyle->SingleColorIcon(":/icons/history"),
                     tr("&Transactions"), this);
     historyAction->setStatusTip(tr("Browse transaction history"));
     historyAction->setToolTip(historyAction->statusTip());
     historyAction->setCheckable(true);
     historyAction->setShortcut(QKeySequence(Qt::ALT + Qt::Key_4));
     tabGroup->addAction(historyAction);
 
 #ifdef ENABLE_WALLET
     // These showNormalIfMinimized are needed because Send Coins and Receive
     // Coins can be triggered from the tray menu, and need to show the GUI to be
     // useful.
     connect(overviewAction, SIGNAL(triggered()), this,
             SLOT(showNormalIfMinimized()));
     connect(overviewAction, SIGNAL(triggered()), this,
             SLOT(gotoOverviewPage()));
     connect(sendCoinsAction, SIGNAL(triggered()), this,
             SLOT(showNormalIfMinimized()));
     connect(sendCoinsAction, SIGNAL(triggered()), this,
             SLOT(gotoSendCoinsPage()));
     connect(sendCoinsMenuAction, SIGNAL(triggered()), this,
             SLOT(showNormalIfMinimized()));
     connect(sendCoinsMenuAction, SIGNAL(triggered()), this,
             SLOT(gotoSendCoinsPage()));
     connect(receiveCoinsAction, SIGNAL(triggered()), this,
             SLOT(showNormalIfMinimized()));
     connect(receiveCoinsAction, SIGNAL(triggered()), this,
             SLOT(gotoReceiveCoinsPage()));
     connect(receiveCoinsMenuAction, SIGNAL(triggered()), this,
             SLOT(showNormalIfMinimized()));
     connect(receiveCoinsMenuAction, SIGNAL(triggered()), this,
             SLOT(gotoReceiveCoinsPage()));
     connect(historyAction, SIGNAL(triggered()), this,
             SLOT(showNormalIfMinimized()));
     connect(historyAction, SIGNAL(triggered()), this, SLOT(gotoHistoryPage()));
 #endif // ENABLE_WALLET
 
     quitAction = new QAction(platformStyle->TextColorIcon(":/icons/quit"),
                              tr("E&xit"), this);
     quitAction->setStatusTip(tr("Quit application"));
     quitAction->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_Q));
     quitAction->setMenuRole(QAction::QuitRole);
     aboutAction = new QAction(platformStyle->TextColorIcon(":/icons/about"),
                               tr("&About %1").arg(tr(PACKAGE_NAME)), this);
     aboutAction->setStatusTip(
         tr("Show information about %1").arg(tr(PACKAGE_NAME)));
     aboutAction->setMenuRole(QAction::AboutRole);
     aboutAction->setEnabled(false);
     aboutQtAction =
         new QAction(platformStyle->TextColorIcon(":/icons/about_qt"),
                     tr("About &Qt"), this);
     aboutQtAction->setStatusTip(tr("Show information about Qt"));
     aboutQtAction->setMenuRole(QAction::AboutQtRole);
     optionsAction = new QAction(platformStyle->TextColorIcon(":/icons/options"),
                                 tr("&Options..."), this);
     optionsAction->setStatusTip(
         tr("Modify configuration options for %1").arg(tr(PACKAGE_NAME)));
     optionsAction->setMenuRole(QAction::PreferencesRole);
     optionsAction->setEnabled(false);
     toggleHideAction =
         new QAction(platformStyle->TextColorIcon(":/icons/about"),
                     tr("&Show / Hide"), this);
     toggleHideAction->setStatusTip(tr("Show or hide the main Window"));
 
     encryptWalletAction =
         new QAction(platformStyle->TextColorIcon(":/icons/lock_closed"),
                     tr("&Encrypt Wallet..."), this);
     encryptWalletAction->setStatusTip(
         tr("Encrypt the private keys that belong to your wallet"));
     encryptWalletAction->setCheckable(true);
     backupWalletAction =
         new QAction(platformStyle->TextColorIcon(":/icons/filesave"),
                     tr("&Backup Wallet..."), this);
     backupWalletAction->setStatusTip(tr("Backup wallet to another location"));
     changePassphraseAction =
         new QAction(platformStyle->TextColorIcon(":/icons/key"),
                     tr("&Change Passphrase..."), this);
     changePassphraseAction->setStatusTip(
         tr("Change the passphrase used for wallet encryption"));
     signMessageAction =
         new QAction(platformStyle->TextColorIcon(":/icons/edit"),
                     tr("Sign &message..."), this);
     signMessageAction->setStatusTip(
         tr("Sign messages with your Bitcoin addresses to prove you own them"));
     verifyMessageAction =
         new QAction(platformStyle->TextColorIcon(":/icons/verify"),
                     tr("&Verify message..."), this);
     verifyMessageAction->setStatusTip(
         tr("Verify messages to ensure they were signed with specified Bitcoin "
            "addresses"));
 
     openRPCConsoleAction =
         new QAction(platformStyle->TextColorIcon(":/icons/debugwindow"),
                     tr("&Debug window"), this);
     openRPCConsoleAction->setStatusTip(
         tr("Open debugging and diagnostic console"));
     // initially disable the debug window menu item
     openRPCConsoleAction->setEnabled(false);
 
     usedSendingAddressesAction =
         new QAction(platformStyle->TextColorIcon(":/icons/address-book"),
                     tr("&Sending addresses..."), this);
     usedSendingAddressesAction->setStatusTip(
         tr("Show the list of used sending addresses and labels"));
     usedReceivingAddressesAction =
         new QAction(platformStyle->TextColorIcon(":/icons/address-book"),
                     tr("&Receiving addresses..."), this);
     usedReceivingAddressesAction->setStatusTip(
         tr("Show the list of used receiving addresses and labels"));
 
     openAction = new QAction(platformStyle->TextColorIcon(":/icons/open"),
                              tr("Open &URI..."), this);
     openAction->setStatusTip(
         tr("Open a %1: URI or payment request")
             .arg(QString::fromStdString(
                 config->GetChainParams().CashAddrPrefix())));
 
     showHelpMessageAction =
         new QAction(platformStyle->TextColorIcon(":/icons/info"),
                     tr("&Command-line options"), this);
     showHelpMessageAction->setMenuRole(QAction::NoRole);
     showHelpMessageAction->setStatusTip(
         tr("Show the %1 help message to get a list with possible Bitcoin "
            "command-line options")
             .arg(tr(PACKAGE_NAME)));
 
     connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
     connect(aboutAction, SIGNAL(triggered()), this, SLOT(aboutClicked()));
     connect(aboutQtAction, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
     connect(optionsAction, SIGNAL(triggered()), this, SLOT(optionsClicked()));
     connect(toggleHideAction, SIGNAL(triggered()), this, SLOT(toggleHidden()));
     connect(showHelpMessageAction, SIGNAL(triggered()), this,
             SLOT(showHelpMessageClicked()));
     connect(openRPCConsoleAction, SIGNAL(triggered()), this,
             SLOT(showDebugWindow()));
     // prevents an open debug window from becoming stuck/unusable on client
     // shutdown
     connect(quitAction, SIGNAL(triggered()), rpcConsole, SLOT(hide()));
 
 #ifdef ENABLE_WALLET
     if (walletFrame) {
         connect(encryptWalletAction, SIGNAL(triggered(bool)), walletFrame,
                 SLOT(encryptWallet(bool)));
         connect(backupWalletAction, SIGNAL(triggered()), walletFrame,
                 SLOT(backupWallet()));
         connect(changePassphraseAction, SIGNAL(triggered()), walletFrame,
                 SLOT(changePassphrase()));
         connect(signMessageAction, SIGNAL(triggered()), this,
                 SLOT(gotoSignMessageTab()));
         connect(verifyMessageAction, SIGNAL(triggered()), this,
                 SLOT(gotoVerifyMessageTab()));
         connect(usedSendingAddressesAction, SIGNAL(triggered()), walletFrame,
                 SLOT(usedSendingAddresses()));
         connect(usedReceivingAddressesAction, SIGNAL(triggered()), walletFrame,
                 SLOT(usedReceivingAddresses()));
         connect(openAction, SIGNAL(triggered()), this, SLOT(openClicked()));
     }
 #endif // ENABLE_WALLET
 
     new QShortcut(QKeySequence(Qt::CTRL + Qt::SHIFT + Qt::Key_C), this,
                   SLOT(showDebugWindowActivateConsole()));
     new QShortcut(QKeySequence(Qt::CTRL + Qt::SHIFT + Qt::Key_D), this,
                   SLOT(showDebugWindow()));
 }
 
 void BitcoinGUI::createMenuBar() {
 #ifdef Q_OS_MAC
     // Create a decoupled menu bar on Mac which stays even if the window is
     // closed
     appMenuBar = new QMenuBar();
 #else
     // Get the main window's menu bar on other platforms
     appMenuBar = menuBar();
 #endif
 
     // Configure the menus
     QMenu *file = appMenuBar->addMenu(tr("&File"));
     if (walletFrame) {
         file->addAction(openAction);
         file->addAction(backupWalletAction);
         file->addAction(signMessageAction);
         file->addAction(verifyMessageAction);
         file->addSeparator();
         file->addAction(usedSendingAddressesAction);
         file->addAction(usedReceivingAddressesAction);
         file->addSeparator();
     }
     file->addAction(quitAction);
 
     QMenu *settings = appMenuBar->addMenu(tr("&Settings"));
     if (walletFrame) {
         settings->addAction(encryptWalletAction);
         settings->addAction(changePassphraseAction);
         settings->addSeparator();
     }
     settings->addAction(optionsAction);
 
     QMenu *help = appMenuBar->addMenu(tr("&Help"));
     if (walletFrame) {
         help->addAction(openRPCConsoleAction);
     }
     help->addAction(showHelpMessageAction);
     help->addSeparator();
     help->addAction(aboutAction);
     help->addAction(aboutQtAction);
 }
 
 void BitcoinGUI::createToolBars() {
     if (walletFrame) {
         QToolBar *toolbar = addToolBar(tr("Tabs toolbar"));
         appToolBar = toolbar;
         toolbar->setContextMenuPolicy(Qt::PreventContextMenu);
         toolbar->setMovable(false);
         toolbar->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
         toolbar->addAction(overviewAction);
         toolbar->addAction(sendCoinsAction);
         toolbar->addAction(receiveCoinsAction);
         toolbar->addAction(historyAction);
         overviewAction->setChecked(true);
 
 #ifdef ENABLE_WALLET
         QWidget *spacer = new QWidget();
         spacer->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
         toolbar->addWidget(spacer);
 
         m_wallet_selector = new QComboBox();
         connect(m_wallet_selector, SIGNAL(currentIndexChanged(const QString &)),
                 this, SLOT(setCurrentWallet(const QString &)));
 #endif
     }
 }
 
 void BitcoinGUI::setClientModel(ClientModel *_clientModel) {
     this->clientModel = _clientModel;
     if (_clientModel) {
         // Create system tray menu (or setup the dock menu) that late to prevent
         // users from calling actions, while the client has not yet fully loaded
         createTrayIconMenu();
 
         // Keep up to date with client
         updateNetworkState();
         connect(_clientModel, SIGNAL(numConnectionsChanged(int)), this,
                 SLOT(setNumConnections(int)));
         connect(_clientModel, SIGNAL(networkActiveChanged(bool)), this,
                 SLOT(setNetworkActive(bool)));
 
         modalOverlay->setKnownBestHeight(
             _clientModel->getHeaderTipHeight(),
             QDateTime::fromTime_t(_clientModel->getHeaderTipTime()));
         setNumBlocks(m_node.getNumBlocks(),
                      QDateTime::fromTime_t(m_node.getLastBlockTime()),
                      m_node.getVerificationProgress(), false);
         connect(_clientModel,
                 SIGNAL(numBlocksChanged(int, QDateTime, double, bool)), this,
                 SLOT(setNumBlocks(int, QDateTime, double, bool)));
 
         // Receive and report messages from client model
         connect(_clientModel, SIGNAL(message(QString, QString, unsigned int)),
                 this, SLOT(message(QString, QString, unsigned int)));
 
         // Show progress dialog
         connect(_clientModel, SIGNAL(showProgress(QString, int)), this,
                 SLOT(showProgress(QString, int)));
 
         rpcConsole->setClientModel(_clientModel);
 #ifdef ENABLE_WALLET
         if (walletFrame) {
             walletFrame->setClientModel(_clientModel);
         }
 #endif // ENABLE_WALLET
         unitDisplayControl->setOptionsModel(_clientModel->getOptionsModel());
 
         OptionsModel *optionsModel = _clientModel->getOptionsModel();
         if (optionsModel) {
             // be aware of the tray icon disable state change reported by the
             // OptionsModel object.
             connect(optionsModel, SIGNAL(hideTrayIconChanged(bool)), this,
                     SLOT(setTrayIconVisible(bool)));
 
             // initialize the disable state of the tray icon with the current
             // value in the model.
             setTrayIconVisible(optionsModel->getHideTrayIcon());
         }
     } else {
         // Disable possibility to show main window via action
         toggleHideAction->setEnabled(false);
         if (trayIconMenu) {
             // Disable context menu on tray icon
             trayIconMenu->clear();
         }
         // Propagate cleared model to child objects
         rpcConsole->setClientModel(nullptr);
 #ifdef ENABLE_WALLET
         if (walletFrame) {
             walletFrame->setClientModel(nullptr);
         }
 #endif // ENABLE_WALLET
         unitDisplayControl->setOptionsModel(nullptr);
     }
 }
 
 #ifdef ENABLE_WALLET
 bool BitcoinGUI::addWallet(WalletModel *walletModel) {
     if (!walletFrame) return false;
     const QString name = walletModel->getWalletName();
     setWalletActionsEnabled(true);
     m_wallet_selector->addItem(name);
     if (m_wallet_selector->count() == 2) {
         m_wallet_selector_label = new QLabel();
         m_wallet_selector_label->setText(tr("Wallet:") + " ");
         m_wallet_selector_label->setBuddy(m_wallet_selector);
         appToolBar->addWidget(m_wallet_selector_label);
         appToolBar->addWidget(m_wallet_selector);
     }
     rpcConsole->addWallet(walletModel);
     return walletFrame->addWallet(walletModel);
 }
 
 bool BitcoinGUI::setCurrentWallet(const QString &name) {
     if (!walletFrame) return false;
     return walletFrame->setCurrentWallet(name);
 }
 
 void BitcoinGUI::removeAllWallets() {
     if (!walletFrame) return;
     setWalletActionsEnabled(false);
     walletFrame->removeAllWallets();
 }
 #endif // ENABLE_WALLET
 
 void BitcoinGUI::setWalletActionsEnabled(bool enabled) {
     overviewAction->setEnabled(enabled);
     sendCoinsAction->setEnabled(enabled);
     sendCoinsMenuAction->setEnabled(enabled);
     receiveCoinsAction->setEnabled(enabled);
     receiveCoinsMenuAction->setEnabled(enabled);
     historyAction->setEnabled(enabled);
     encryptWalletAction->setEnabled(enabled);
     backupWalletAction->setEnabled(enabled);
     changePassphraseAction->setEnabled(enabled);
     signMessageAction->setEnabled(enabled);
     verifyMessageAction->setEnabled(enabled);
     usedSendingAddressesAction->setEnabled(enabled);
     usedReceivingAddressesAction->setEnabled(enabled);
     openAction->setEnabled(enabled);
 }
 
 void BitcoinGUI::createTrayIcon(const NetworkStyle *networkStyle) {
 #ifndef Q_OS_MAC
     trayIcon = new QSystemTrayIcon(this);
     QString toolTip = tr("%1 client").arg(tr(PACKAGE_NAME)) + " " +
                       networkStyle->getTitleAddText();
     trayIcon->setToolTip(toolTip);
     trayIcon->setIcon(networkStyle->getTrayAndWindowIcon());
     trayIcon->hide();
 #endif
 
     notificator =
         new Notificator(QApplication::applicationName(), trayIcon, this);
 }
 
 void BitcoinGUI::createTrayIconMenu() {
 #ifndef Q_OS_MAC
     // return if trayIcon is unset (only on non-Mac OSes)
     if (!trayIcon) return;
 
     trayIconMenu = new QMenu(this);
     trayIcon->setContextMenu(trayIconMenu);
 
     connect(trayIcon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)),
             this, SLOT(trayIconActivated(QSystemTrayIcon::ActivationReason)));
 #else
     // Note: On Mac, the dock icon is used to provide the tray's functionality.
     MacDockIconHandler *dockIconHandler = MacDockIconHandler::instance();
     dockIconHandler->setMainWindow(static_cast<QMainWindow *>(this));
     trayIconMenu = dockIconHandler->dockMenu();
 #endif
 
     // Configuration of the tray icon (or dock icon) icon menu
     trayIconMenu->addAction(toggleHideAction);
     trayIconMenu->addSeparator();
     trayIconMenu->addAction(sendCoinsMenuAction);
     trayIconMenu->addAction(receiveCoinsMenuAction);
     trayIconMenu->addSeparator();
     trayIconMenu->addAction(signMessageAction);
     trayIconMenu->addAction(verifyMessageAction);
     trayIconMenu->addSeparator();
     trayIconMenu->addAction(optionsAction);
     trayIconMenu->addAction(openRPCConsoleAction);
 #ifndef Q_OS_MAC // This is built-in on Mac
     trayIconMenu->addSeparator();
     trayIconMenu->addAction(quitAction);
 #endif
 }
 
 #ifndef Q_OS_MAC
 void BitcoinGUI::trayIconActivated(QSystemTrayIcon::ActivationReason reason) {
     if (reason == QSystemTrayIcon::Trigger) {
         // Click on system tray icon triggers show/hide of the main window
         toggleHidden();
     }
 }
 #endif
 
 void BitcoinGUI::optionsClicked() {
     if (!clientModel || !clientModel->getOptionsModel()) return;
 
     OptionsDialog dlg(this, enableWallet);
     dlg.setModel(clientModel->getOptionsModel());
     dlg.exec();
 }
 
 void BitcoinGUI::aboutClicked() {
     if (!clientModel) return;
 
     HelpMessageDialog dlg(m_node, this, true);
     dlg.exec();
 }
 
 void BitcoinGUI::showDebugWindow() {
     rpcConsole->showNormal();
     rpcConsole->show();
     rpcConsole->raise();
     rpcConsole->activateWindow();
 }
 
 void BitcoinGUI::showDebugWindowActivateConsole() {
     rpcConsole->setTabFocus(RPCConsole::TAB_CONSOLE);
     showDebugWindow();
 }
 
 void BitcoinGUI::showHelpMessageClicked() {
     helpMessageDialog->show();
 }
 
 #ifdef ENABLE_WALLET
 void BitcoinGUI::openClicked() {
     OpenURIDialog dlg(config->GetChainParams(), this);
     if (dlg.exec()) {
         Q_EMIT receivedURI(dlg.getURI());
     }
 }
 
 void BitcoinGUI::gotoOverviewPage() {
     overviewAction->setChecked(true);
     if (walletFrame) walletFrame->gotoOverviewPage();
 }
 
 void BitcoinGUI::gotoHistoryPage() {
     historyAction->setChecked(true);
     if (walletFrame) walletFrame->gotoHistoryPage();
 }
 
 void BitcoinGUI::gotoReceiveCoinsPage() {
     receiveCoinsAction->setChecked(true);
     if (walletFrame) walletFrame->gotoReceiveCoinsPage();
 }
 
 void BitcoinGUI::gotoSendCoinsPage(QString addr) {
     sendCoinsAction->setChecked(true);
     if (walletFrame) walletFrame->gotoSendCoinsPage(addr);
 }
 
 void BitcoinGUI::gotoSignMessageTab(QString addr) {
     if (walletFrame) walletFrame->gotoSignMessageTab(addr);
 }
 
 void BitcoinGUI::gotoVerifyMessageTab(QString addr) {
     if (walletFrame) walletFrame->gotoVerifyMessageTab(addr);
 }
 #endif // ENABLE_WALLET
 
 void BitcoinGUI::updateNetworkState() {
     int count = clientModel->getNumConnections();
     QString icon;
     switch (count) {
         case 0:
             icon = ":/icons/connect_0";
             break;
         case 1:
         case 2:
         case 3:
             icon = ":/icons/connect_1";
             break;
         case 4:
         case 5:
         case 6:
             icon = ":/icons/connect_2";
             break;
         case 7:
         case 8:
         case 9:
             icon = ":/icons/connect_3";
             break;
         default:
             icon = ":/icons/connect_4";
             break;
     }
 
     QString tooltip;
 
     if (m_node.getNetworkActive()) {
         tooltip = tr("%n active connection(s) to Bitcoin network", "", count) +
                   QString(".<br>") + tr("Click to disable network activity.");
     } else {
         tooltip = tr("Network activity disabled.") + QString("<br>") +
                   tr("Click to enable network activity again.");
         icon = ":/icons/network_disabled";
     }
 
     // Don't word-wrap this (fixed-width) tooltip
     tooltip = QString("<nobr>") + tooltip + QString("</nobr>");
     connectionsControl->setToolTip(tooltip);
 
     connectionsControl->setPixmap(platformStyle->SingleColorIcon(icon).pixmap(
         STATUSBAR_ICONSIZE, STATUSBAR_ICONSIZE));
 }
 
 void BitcoinGUI::setNumConnections(int count) {
     updateNetworkState();
 }
 
 void BitcoinGUI::setNetworkActive(bool networkActive) {
     updateNetworkState();
 }
 
 void BitcoinGUI::updateHeadersSyncProgressLabel() {
     int64_t headersTipTime = clientModel->getHeaderTipTime();
     int headersTipHeight = clientModel->getHeaderTipHeight();
     int estHeadersLeft =
         (GetTime() - headersTipTime) /
         config->GetChainParams().GetConsensus().nPowTargetSpacing;
     if (estHeadersLeft > HEADER_HEIGHT_DELTA_SYNC) {
         progressBarLabel->setText(
             tr("Syncing Headers (%1%)...")
                 .arg(QString::number(100.0 /
                                          (headersTipHeight + estHeadersLeft) *
                                          headersTipHeight,
                                      'f', 1)));
     }
 }
 
 void BitcoinGUI::setNumBlocks(int count, const QDateTime &blockDate,
                               double nVerificationProgress, bool header) {
     if (modalOverlay) {
         if (header) {
             modalOverlay->setKnownBestHeight(count, blockDate);
         } else {
             modalOverlay->tipUpdate(count, blockDate, nVerificationProgress);
         }
     }
     if (!clientModel) {
         return;
     }
 
     // Prevent orphan statusbar messages (e.g. hover Quit in main menu, wait
     // until chain-sync starts -> garbled text)
     statusBar()->clearMessage();
 
     // Acquire current block source
     enum BlockSource blockSource = clientModel->getBlockSource();
     switch (blockSource) {
         case BlockSource::NETWORK:
             if (header) {
                 updateHeadersSyncProgressLabel();
                 return;
             }
             progressBarLabel->setText(tr("Synchronizing with network..."));
             updateHeadersSyncProgressLabel();
             break;
         case BlockSource::DISK:
             if (header) {
                 progressBarLabel->setText(tr("Indexing blocks on disk..."));
             } else {
                 progressBarLabel->setText(tr("Processing blocks on disk..."));
             }
             break;
         case BlockSource::REINDEX:
             progressBarLabel->setText(tr("Reindexing blocks on disk..."));
             break;
         case BlockSource::NONE:
             if (header) {
                 return;
             }
             progressBarLabel->setText(tr("Connecting to peers..."));
             break;
     }
 
     QString tooltip;
 
     QDateTime currentDate = QDateTime::currentDateTime();
     qint64 secs = blockDate.secsTo(currentDate);
 
     tooltip = tr("Processed %n block(s) of transaction history.", "", count);
 
     // Set icon state: spinning if catching up, tick otherwise
     if (secs < MAX_BLOCK_TIME_GAP) {
         tooltip = tr("Up to date") + QString(".<br>") + tooltip;
         labelBlocksIcon->setPixmap(
             platformStyle->SingleColorIcon(":/icons/synced")
                 .pixmap(STATUSBAR_ICONSIZE, STATUSBAR_ICONSIZE));
 
 #ifdef ENABLE_WALLET
         if (walletFrame) {
             walletFrame->showOutOfSyncWarning(false);
             modalOverlay->showHide(true, true);
         }
 #endif // ENABLE_WALLET
 
         progressBarLabel->setVisible(false);
         progressBar->setVisible(false);
     } else {
         QString timeBehindText = GUIUtil::formatNiceTimeOffset(secs);
 
         progressBarLabel->setVisible(true);
         progressBar->setFormat(tr("%1 behind").arg(timeBehindText));
         progressBar->setMaximum(1000000000);
         progressBar->setValue(nVerificationProgress * 1000000000.0 + 0.5);
         progressBar->setVisible(true);
 
         tooltip = tr("Catching up...") + QString("<br>") + tooltip;
         if (count != prevBlocks) {
             labelBlocksIcon->setPixmap(
                 platformStyle
                     ->SingleColorIcon(QString(":/movies/spinner-%1")
                                           .arg(spinnerFrame, 3, 10, QChar('0')))
                     .pixmap(STATUSBAR_ICONSIZE, STATUSBAR_ICONSIZE));
             spinnerFrame = (spinnerFrame + 1) % SPINNER_FRAMES;
         }
         prevBlocks = count;
 
 #ifdef ENABLE_WALLET
         if (walletFrame) {
             walletFrame->showOutOfSyncWarning(true);
             modalOverlay->showHide();
         }
 #endif // ENABLE_WALLET
 
         tooltip += QString("<br>");
         tooltip +=
             tr("Last received block was generated %1 ago.").arg(timeBehindText);
         tooltip += QString("<br>");
         tooltip += tr("Transactions after this will not yet be visible.");
     }
 
     // Don't word-wrap this (fixed-width) tooltip
     tooltip = QString("<nobr>") + tooltip + QString("</nobr>");
 
     labelBlocksIcon->setToolTip(tooltip);
     progressBarLabel->setToolTip(tooltip);
     progressBar->setToolTip(tooltip);
 }
 
 void BitcoinGUI::message(const QString &title, const QString &message,
                          unsigned int style, bool *ret) {
     // default title
     QString strTitle = tr("Bitcoin");
     // Default to information icon
     int nMBoxIcon = QMessageBox::Information;
     int nNotifyIcon = Notificator::Information;
 
     QString msgType;
 
     // Prefer supplied title over style based title
     if (!title.isEmpty()) {
         msgType = title;
     } else {
         switch (style) {
             case CClientUIInterface::MSG_ERROR:
                 msgType = tr("Error");
                 break;
             case CClientUIInterface::MSG_WARNING:
                 msgType = tr("Warning");
                 break;
             case CClientUIInterface::MSG_INFORMATION:
                 msgType = tr("Information");
                 break;
             default:
                 break;
         }
     }
     // Append title to "Bitcoin - "
     if (!msgType.isEmpty()) {
         strTitle += " - " + msgType;
     }
 
     // Check for error/warning icon
     if (style & CClientUIInterface::ICON_ERROR) {
         nMBoxIcon = QMessageBox::Critical;
         nNotifyIcon = Notificator::Critical;
     } else if (style & CClientUIInterface::ICON_WARNING) {
         nMBoxIcon = QMessageBox::Warning;
         nNotifyIcon = Notificator::Warning;
     }
 
     // Display message
     if (style & CClientUIInterface::MODAL) {
         // Check for buttons, use OK as default, if none was supplied
         QMessageBox::StandardButton buttons;
         if (!(buttons = (QMessageBox::StandardButton)(
                   style & CClientUIInterface::BTN_MASK)))
             buttons = QMessageBox::Ok;
 
         showNormalIfMinimized();
         QMessageBox mBox(static_cast<QMessageBox::Icon>(nMBoxIcon), strTitle,
                          message, buttons, this);
         int r = mBox.exec();
         if (ret != nullptr) {
             *ret = r == QMessageBox::Ok;
         }
     } else
         notificator->notify(static_cast<Notificator::Class>(nNotifyIcon),
                             strTitle, message);
 }
 
 void BitcoinGUI::changeEvent(QEvent *e) {
     QMainWindow::changeEvent(e);
 #ifndef Q_OS_MAC // Ignored on Mac
     if (e->type() == QEvent::WindowStateChange) {
         if (clientModel && clientModel->getOptionsModel() &&
             clientModel->getOptionsModel()->getMinimizeToTray()) {
             QWindowStateChangeEvent *wsevt =
                 static_cast<QWindowStateChangeEvent *>(e);
             if (!(wsevt->oldState() & Qt::WindowMinimized) && isMinimized()) {
                 QTimer::singleShot(0, this, SLOT(hide()));
                 e->ignore();
             } else if ((wsevt->oldState() & Qt::WindowMinimized) &&
                        !isMinimized()) {
                 QTimer::singleShot(0, this, SLOT(show()));
                 e->ignore();
             }
         }
     }
 #endif
 }
 
 void BitcoinGUI::closeEvent(QCloseEvent *event) {
 #ifndef Q_OS_MAC // Ignored on Mac
     if (clientModel && clientModel->getOptionsModel()) {
         if (!clientModel->getOptionsModel()->getMinimizeOnClose()) {
             // close rpcConsole in case it was open to make some space for the
             // shutdown window
             rpcConsole->close();
 
             QApplication::quit();
         } else {
             QMainWindow::showMinimized();
             event->ignore();
         }
     }
 #else
     QMainWindow::closeEvent(event);
 #endif
 }
 
 void BitcoinGUI::showEvent(QShowEvent *event) {
     // enable the debug window when the main window shows up
     openRPCConsoleAction->setEnabled(true);
     aboutAction->setEnabled(true);
     optionsAction->setEnabled(true);
 }
 
 #ifdef ENABLE_WALLET
 void BitcoinGUI::incomingTransaction(const QString &date, int unit,
                                      const Amount amount, const QString &type,
                                      const QString &address,
                                      const QString &label,
                                      const QString &walletName) {
     // On new transaction, make an info balloon
     QString msg = tr("Date: %1\n").arg(date) +
                   tr("Amount: %1\n")
                       .arg(BitcoinUnits::formatWithUnit(unit, amount, true));
     if (m_node.getWallets().size() > 1 && !walletName.isEmpty()) {
         msg += tr("Wallet: %1\n").arg(walletName);
     }
     msg += tr("Type: %1\n").arg(type);
     if (!label.isEmpty()) {
         msg += tr("Label: %1\n").arg(label);
     } else if (!address.isEmpty()) {
         msg += tr("Address: %1\n").arg(address);
     }
     message(amount < Amount::zero() ? tr("Sent transaction")
                                     : tr("Incoming transaction"),
             msg, CClientUIInterface::MSG_INFORMATION);
 }
 #endif // ENABLE_WALLET
 
 void BitcoinGUI::dragEnterEvent(QDragEnterEvent *event) {
     // Accept only URIs
     if (event->mimeData()->hasUrls()) {
         event->acceptProposedAction();
     }
 }
 
 void BitcoinGUI::dropEvent(QDropEvent *event) {
     if (event->mimeData()->hasUrls()) {
         for (const QUrl &uri : event->mimeData()->urls()) {
             Q_EMIT receivedURI(uri.toString());
         }
     }
     event->acceptProposedAction();
 }
 
 bool BitcoinGUI::eventFilter(QObject *object, QEvent *event) {
     // Catch status tip events
     if (event->type() == QEvent::StatusTip) {
         // Prevent adding text from setStatusTip(), if we currently use the
         // status bar for displaying other stuff
         if (progressBarLabel->isVisible() || progressBar->isVisible()) {
             return true;
         }
     }
     return QMainWindow::eventFilter(object, event);
 }
 
 #ifdef ENABLE_WALLET
 bool BitcoinGUI::handlePaymentRequest(const SendCoinsRecipient &recipient) {
     // URI has to be valid
     if (walletFrame && walletFrame->handlePaymentRequest(recipient)) {
         showNormalIfMinimized();
         gotoSendCoinsPage();
         return true;
     }
     return false;
 }
 
 void BitcoinGUI::setHDStatus(int hdEnabled) {
     labelWalletHDStatusIcon->setPixmap(
         platformStyle
             ->SingleColorIcon(hdEnabled ? ":/icons/hd_enabled"
                                         : ":/icons/hd_disabled")
             .pixmap(STATUSBAR_ICONSIZE, STATUSBAR_ICONSIZE));
     labelWalletHDStatusIcon->setToolTip(
         hdEnabled ? tr("HD key generation is <b>enabled</b>")
                   : tr("HD key generation is <b>disabled</b>"));
 
     // eventually disable the QLabel to set its opacity to 50%
     labelWalletHDStatusIcon->setEnabled(hdEnabled);
 }
 
 void BitcoinGUI::setEncryptionStatus(int status) {
     switch (status) {
         case WalletModel::Unencrypted:
             labelWalletEncryptionIcon->hide();
             encryptWalletAction->setChecked(false);
             changePassphraseAction->setEnabled(false);
             encryptWalletAction->setEnabled(true);
             break;
         case WalletModel::Unlocked:
             labelWalletEncryptionIcon->show();
             labelWalletEncryptionIcon->setPixmap(
                 platformStyle->SingleColorIcon(":/icons/lock_open")
                     .pixmap(STATUSBAR_ICONSIZE, STATUSBAR_ICONSIZE));
             labelWalletEncryptionIcon->setToolTip(
                 tr("Wallet is <b>encrypted</b> and currently <b>unlocked</b>"));
             encryptWalletAction->setChecked(true);
             changePassphraseAction->setEnabled(true);
             encryptWalletAction->setEnabled(
                 false); // TODO: decrypt currently not supported
             break;
         case WalletModel::Locked:
             labelWalletEncryptionIcon->show();
             labelWalletEncryptionIcon->setPixmap(
                 platformStyle->SingleColorIcon(":/icons/lock_closed")
                     .pixmap(STATUSBAR_ICONSIZE, STATUSBAR_ICONSIZE));
             labelWalletEncryptionIcon->setToolTip(
                 tr("Wallet is <b>encrypted</b> and currently <b>locked</b>"));
             encryptWalletAction->setChecked(true);
             changePassphraseAction->setEnabled(true);
             encryptWalletAction->setEnabled(
                 false); // TODO: decrypt currently not supported
             break;
     }
 }
 
 void BitcoinGUI::updateWalletStatus() {
     if (!walletFrame) {
         return;
     }
     WalletView *const walletView = walletFrame->currentWalletView();
     if (!walletView) {
         return;
     }
     WalletModel *const walletModel = walletView->getWalletModel();
     setEncryptionStatus(walletModel->getEncryptionStatus());
     setHDStatus(walletModel->wallet().hdEnabled());
 }
 #endif // ENABLE_WALLET
 
 void BitcoinGUI::showNormalIfMinimized(bool fToggleHidden) {
     if (!clientModel) {
         return;
     }
 
     // activateWindow() (sometimes) helps with keyboard focus on Windows
     if (isHidden()) {
         show();
         activateWindow();
     } else if (isMinimized()) {
         showNormal();
         activateWindow();
     } else if (GUIUtil::isObscured(this)) {
         raise();
         activateWindow();
     } else if (fToggleHidden) {
         hide();
     }
 }
 
 void BitcoinGUI::toggleHidden() {
     showNormalIfMinimized(true);
 }
 
 void BitcoinGUI::detectShutdown() {
     if (m_node.shutdownRequested()) {
         if (rpcConsole) {
             rpcConsole->hide();
         }
         qApp->quit();
     }
 }
 
 void BitcoinGUI::showProgress(const QString &title, int nProgress) {
     if (nProgress == 0) {
         progressDialog = new QProgressDialog(title, "", 0, 100);
         progressDialog->setWindowModality(Qt::ApplicationModal);
         progressDialog->setMinimumDuration(0);
         progressDialog->setCancelButton(0);
         progressDialog->setAutoClose(false);
         progressDialog->setValue(0);
     } else if (progressDialog) {
         if (nProgress == 100) {
             progressDialog->close();
             progressDialog->deleteLater();
         } else {
             progressDialog->setValue(nProgress);
         }
     }
 }
 
 void BitcoinGUI::setTrayIconVisible(bool fHideTrayIcon) {
     if (trayIcon) {
         trayIcon->setVisible(!fHideTrayIcon);
     }
 }
 
 void BitcoinGUI::showModalOverlay() {
     if (modalOverlay &&
         (progressBar->isVisible() || modalOverlay->isLayerVisible())) {
         modalOverlay->toggleVisibility();
     }
 }
 
 static bool ThreadSafeMessageBox(BitcoinGUI *gui, const std::string &message,
                                  const std::string &caption,
                                  unsigned int style) {
     bool modal = (style & CClientUIInterface::MODAL);
     // The SECURE flag has no effect in the Qt GUI.
     // bool secure = (style & CClientUIInterface::SECURE);
     style &= ~CClientUIInterface::SECURE;
     bool ret = false;
     // In case of modal message, use blocking connection to wait for user to
     // click a button
     QMetaObject::invokeMethod(gui, "message",
                               modal ? GUIUtil::blockingGUIThreadConnection()
                                     : Qt::QueuedConnection,
                               Q_ARG(QString, QString::fromStdString(caption)),
                               Q_ARG(QString, QString::fromStdString(message)),
                               Q_ARG(unsigned int, style), Q_ARG(bool *, &ret));
     return ret;
 }
 
 void BitcoinGUI::subscribeToCoreSignals() {
     // Connect signals to client
     m_handler_message_box = m_node.handleMessageBox(
-        boost::bind(ThreadSafeMessageBox, this, _1, _2, _3));
+        std::bind(ThreadSafeMessageBox, this, std::placeholders::_1,
+                  std::placeholders::_2, std::placeholders::_3));
     m_handler_question = m_node.handleQuestion(
-        boost::bind(ThreadSafeMessageBox, this, _1, _3, _4));
+        std::bind(ThreadSafeMessageBox, this, std::placeholders::_1,
+                  std::placeholders::_3, std::placeholders::_4));
 }
 
 void BitcoinGUI::unsubscribeFromCoreSignals() {
     // Disconnect signals from client
     m_handler_message_box->disconnect();
     m_handler_question->disconnect();
 }
 
 void BitcoinGUI::toggleNetworkActive() {
     m_node.setNetworkActive(!m_node.getNetworkActive());
 }
 
 UnitDisplayStatusBarControl::UnitDisplayStatusBarControl(
     const PlatformStyle *platformStyle)
     : optionsModel(0), menu(0) {
     createContextMenu();
     setToolTip(tr("Unit to show amounts in. Click to select another unit."));
     QList<BitcoinUnits::Unit> units = BitcoinUnits::availableUnits();
     int max_width = 0;
     const QFontMetrics fm(font());
     for (const BitcoinUnits::Unit unit : units) {
         max_width = qMax(max_width, fm.width(BitcoinUnits::name(unit)));
     }
     setMinimumSize(max_width, 0);
     setAlignment(Qt::AlignRight | Qt::AlignVCenter);
     setStyleSheet(QString("QLabel { color : %1 }")
                       .arg(platformStyle->SingleColor().name()));
 }
 
 /** So that it responds to button clicks */
 void UnitDisplayStatusBarControl::mousePressEvent(QMouseEvent *event) {
     onDisplayUnitsClicked(event->pos());
 }
 
 /** Creates context menu, its actions, and wires up all the relevant signals for
  * mouse events. */
 void UnitDisplayStatusBarControl::createContextMenu() {
     menu = new QMenu(this);
     for (BitcoinUnits::Unit u : BitcoinUnits::availableUnits()) {
         QAction *menuAction = new QAction(QString(BitcoinUnits::name(u)), this);
         menuAction->setData(QVariant(u));
         menu->addAction(menuAction);
     }
     connect(menu, SIGNAL(triggered(QAction *)), this,
             SLOT(onMenuSelection(QAction *)));
 }
 
 /** Lets the control know about the Options Model (and its signals) */
 void UnitDisplayStatusBarControl::setOptionsModel(OptionsModel *_optionsModel) {
     if (_optionsModel) {
         this->optionsModel = _optionsModel;
 
         // be aware of a display unit change reported by the OptionsModel
         // object.
         connect(_optionsModel, SIGNAL(displayUnitChanged(int)), this,
                 SLOT(updateDisplayUnit(int)));
 
         // initialize the display units label with the current value in the
         // model.
         updateDisplayUnit(_optionsModel->getDisplayUnit());
     }
 }
 
 /** When Display Units are changed on OptionsModel it will refresh the display
  * text of the control on the status bar */
 void UnitDisplayStatusBarControl::updateDisplayUnit(int newUnits) {
     setText(BitcoinUnits::name(newUnits));
 }
 
 /** Shows context menu with Display Unit options by the mouse coordinates */
 void UnitDisplayStatusBarControl::onDisplayUnitsClicked(const QPoint &point) {
     QPoint globalPos = mapToGlobal(point);
     menu->exec(globalPos);
 }
 
 /** Tells underlying optionsModel to update its current display unit. */
 void UnitDisplayStatusBarControl::onMenuSelection(QAction *action) {
     if (action) {
         optionsModel->setDisplayUnit(action->data());
     }
 }
diff --git a/src/qt/clientmodel.cpp b/src/qt/clientmodel.cpp
index f555cc9df..bfb612724 100644
--- a/src/qt/clientmodel.cpp
+++ b/src/qt/clientmodel.cpp
@@ -1,266 +1,268 @@
 // Copyright (c) 2011-2016 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <qt/clientmodel.h>
 
 #include <chain.h>
 #include <chainparams.h>
 #include <checkpoints.h>
 #include <clientversion.h>
 #include <config.h>
 #include <interfaces/handler.h>
 #include <interfaces/node.h>
 #include <net.h>
 #include <qt/bantablemodel.h>
 #include <qt/guiconstants.h>
 #include <qt/guiutil.h>
 #include <qt/peertablemodel.h>
 #include <txmempool.h>
 #include <ui_interface.h>
 #include <util/system.h>
 #include <validation.h>
 #include <warnings.h>
 
 #include <QDebug>
 #include <QTimer>
 
 #include <cstdint>
 
 class CBlockIndex;
 
 static int64_t nLastHeaderTipUpdateNotification = 0;
 static int64_t nLastBlockTipUpdateNotification = 0;
 
 ClientModel::ClientModel(interfaces::Node &node, OptionsModel *_optionsModel,
                          QObject *parent)
     : QObject(parent), m_node(node), optionsModel(_optionsModel),
       peerTableModel(0), banTableModel(0), pollTimer(0) {
     cachedBestHeaderHeight = -1;
     cachedBestHeaderTime = -1;
     peerTableModel = new PeerTableModel(m_node, this);
     banTableModel = new BanTableModel(m_node, this);
     pollTimer = new QTimer(this);
     connect(pollTimer, SIGNAL(timeout()), this, SLOT(updateTimer()));
     pollTimer->start(MODEL_UPDATE_DELAY);
 
     subscribeToCoreSignals();
 }
 
 ClientModel::~ClientModel() {
     unsubscribeFromCoreSignals();
 }
 
 int ClientModel::getNumConnections(unsigned int flags) const {
     CConnman::NumConnections connections = CConnman::CONNECTIONS_NONE;
 
     if (flags == CONNECTIONS_IN) {
         connections = CConnman::CONNECTIONS_IN;
     } else if (flags == CONNECTIONS_OUT) {
         connections = CConnman::CONNECTIONS_OUT;
     } else if (flags == CONNECTIONS_ALL) {
         connections = CConnman::CONNECTIONS_ALL;
     }
 
     return m_node.getNodeCount(connections);
 }
 
 int ClientModel::getHeaderTipHeight() const {
     if (cachedBestHeaderHeight == -1) {
         // make sure we initially populate the cache via a cs_main lock
         // otherwise we need to wait for a tip update
         int height;
         int64_t blockTime;
         if (m_node.getHeaderTip(height, blockTime)) {
             cachedBestHeaderHeight = height;
             cachedBestHeaderTime = blockTime;
         }
     }
     return cachedBestHeaderHeight;
 }
 
 int64_t ClientModel::getHeaderTipTime() const {
     if (cachedBestHeaderTime == -1) {
         int height;
         int64_t blockTime;
         if (m_node.getHeaderTip(height, blockTime)) {
             cachedBestHeaderHeight = height;
             cachedBestHeaderTime = blockTime;
         }
     }
     return cachedBestHeaderTime;
 }
 
 void ClientModel::updateTimer() {
     // no locking required at this point
     // the following calls will acquire the required lock
     Q_EMIT mempoolSizeChanged(m_node.getMempoolSize(),
                               m_node.getMempoolDynamicUsage());
     Q_EMIT bytesChanged(m_node.getTotalBytesRecv(), m_node.getTotalBytesSent());
 }
 
 void ClientModel::updateNumConnections(int numConnections) {
     Q_EMIT numConnectionsChanged(numConnections);
 }
 
 void ClientModel::updateNetworkActive(bool networkActive) {
     Q_EMIT networkActiveChanged(networkActive);
 }
 
 void ClientModel::updateAlert() {
     Q_EMIT alertsChanged(getStatusBarWarnings());
 }
 
 enum BlockSource ClientModel::getBlockSource() const {
     if (m_node.getReindex()) {
         return BlockSource::REINDEX;
     } else if (m_node.getImporting()) {
         return BlockSource::DISK;
     } else if (getNumConnections() > 0) {
         return BlockSource::NETWORK;
     }
 
     return BlockSource::NONE;
 }
 
 QString ClientModel::getStatusBarWarnings() const {
     return QString::fromStdString(m_node.getWarnings("gui"));
 }
 
 OptionsModel *ClientModel::getOptionsModel() {
     return optionsModel;
 }
 
 PeerTableModel *ClientModel::getPeerTableModel() {
     return peerTableModel;
 }
 
 BanTableModel *ClientModel::getBanTableModel() {
     return banTableModel;
 }
 
 QString ClientModel::formatFullVersion() const {
     return QString::fromStdString(FormatFullVersion());
 }
 
 QString ClientModel::formatSubVersion() const {
     return QString::fromStdString(userAgent(GetConfig()));
 }
 
 bool ClientModel::isReleaseVersion() const {
     return CLIENT_VERSION_IS_RELEASE;
 }
 
 QString ClientModel::formatClientStartupTime() const {
     return QDateTime::fromTime_t(GetStartupTime()).toString();
 }
 
 QString ClientModel::dataDir() const {
     return GUIUtil::boostPathToQString(GetDataDir());
 }
 
 QString ClientModel::blocksDir() const {
     return GUIUtil::boostPathToQString(GetBlocksDir());
 }
 
 void ClientModel::updateBanlist() {
     banTableModel->refresh();
 }
 
 // Handlers for core signals
 static void ShowProgress(ClientModel *clientmodel, const std::string &title,
                          int nProgress) {
     // emits signal "showProgress"
     QMetaObject::invokeMethod(clientmodel, "showProgress", Qt::QueuedConnection,
                               Q_ARG(QString, QString::fromStdString(title)),
                               Q_ARG(int, nProgress));
 }
 
 static void NotifyNumConnectionsChanged(ClientModel *clientmodel,
                                         int newNumConnections) {
     // Too noisy: qDebug() << "NotifyNumConnectionsChanged: " +
     // QString::number(newNumConnections);
     QMetaObject::invokeMethod(clientmodel, "updateNumConnections",
                               Qt::QueuedConnection,
                               Q_ARG(int, newNumConnections));
 }
 
 static void NotifyNetworkActiveChanged(ClientModel *clientmodel,
                                        bool networkActive) {
     QMetaObject::invokeMethod(clientmodel, "updateNetworkActive",
                               Qt::QueuedConnection, Q_ARG(bool, networkActive));
 }
 
 static void NotifyAlertChanged(ClientModel *clientmodel) {
     qDebug() << "NotifyAlertChanged";
     QMetaObject::invokeMethod(clientmodel, "updateAlert", Qt::QueuedConnection);
 }
 
 static void BannedListChanged(ClientModel *clientmodel) {
     qDebug() << QString("%1: Requesting update for peer banlist").arg(__func__);
     QMetaObject::invokeMethod(clientmodel, "updateBanlist",
                               Qt::QueuedConnection);
 }
 
 static void BlockTipChanged(ClientModel *clientmodel, bool initialSync,
                             int height, int64_t blockTime,
                             double verificationProgress, bool fHeader) {
     // lock free async UI updates in case we have a new block tip
     // during initial sync, only update the UI if the last update
     // was > 250ms (MODEL_UPDATE_DELAY) ago
     int64_t now = 0;
     if (initialSync) {
         now = GetTimeMillis();
     }
 
     int64_t &nLastUpdateNotification = fHeader
                                            ? nLastHeaderTipUpdateNotification
                                            : nLastBlockTipUpdateNotification;
 
     if (fHeader) {
         // cache best headers time and height to reduce future cs_main locks
         clientmodel->cachedBestHeaderHeight = height;
         clientmodel->cachedBestHeaderTime = blockTime;
     }
     // if we are in-sync, update the UI regardless of last update time
     if (!initialSync || now - nLastUpdateNotification > MODEL_UPDATE_DELAY) {
         // pass an async signal to the UI thread
         QMetaObject::invokeMethod(
             clientmodel, "numBlocksChanged", Qt::QueuedConnection,
             Q_ARG(int, height),
             Q_ARG(QDateTime, QDateTime::fromTime_t(blockTime)),
             Q_ARG(double, verificationProgress), Q_ARG(bool, fHeader));
         nLastUpdateNotification = now;
     }
 }
 
 void ClientModel::subscribeToCoreSignals() {
     // Connect signals to client
-    m_handler_show_progress =
-        m_node.handleShowProgress(boost::bind(ShowProgress, this, _1, _2));
+    m_handler_show_progress = m_node.handleShowProgress(std::bind(
+        ShowProgress, this, std::placeholders::_1, std::placeholders::_2));
     m_handler_notify_num_connections_changed =
-        m_node.handleNotifyNumConnectionsChanged(
-            boost::bind(NotifyNumConnectionsChanged, this, _1));
+        m_node.handleNotifyNumConnectionsChanged(std::bind(
+            NotifyNumConnectionsChanged, this, std::placeholders::_1));
     m_handler_notify_network_active_changed =
         m_node.handleNotifyNetworkActiveChanged(
-            boost::bind(NotifyNetworkActiveChanged, this, _1));
+            std::bind(NotifyNetworkActiveChanged, this, std::placeholders::_1));
     m_handler_notify_alert_changed =
-        m_node.handleNotifyAlertChanged(boost::bind(NotifyAlertChanged, this));
+        m_node.handleNotifyAlertChanged(std::bind(NotifyAlertChanged, this));
     m_handler_banned_list_changed =
-        m_node.handleBannedListChanged(boost::bind(BannedListChanged, this));
-    m_handler_notify_block_tip = m_node.handleNotifyBlockTip(
-        boost::bind(BlockTipChanged, this, _1, _2, _3, _4, false));
-    m_handler_notify_header_tip = m_node.handleNotifyHeaderTip(
-        boost::bind(BlockTipChanged, this, _1, _2, _3, _4, true));
+        m_node.handleBannedListChanged(std::bind(BannedListChanged, this));
+    m_handler_notify_block_tip = m_node.handleNotifyBlockTip(std::bind(
+        BlockTipChanged, this, std::placeholders::_1, std::placeholders::_2,
+        std::placeholders::_3, std::placeholders::_4, false));
+    m_handler_notify_header_tip = m_node.handleNotifyHeaderTip(std::bind(
+        BlockTipChanged, this, std::placeholders::_1, std::placeholders::_2,
+        std::placeholders::_3, std::placeholders::_4, true));
 }
 
 void ClientModel::unsubscribeFromCoreSignals() {
     // Disconnect signals from client
     m_handler_show_progress->disconnect();
     m_handler_notify_num_connections_changed->disconnect();
     m_handler_notify_network_active_changed->disconnect();
     m_handler_notify_alert_changed->disconnect();
     m_handler_banned_list_changed->disconnect();
     m_handler_notify_block_tip->disconnect();
     m_handler_notify_header_tip->disconnect();
 }
diff --git a/src/qt/splashscreen.cpp b/src/qt/splashscreen.cpp
index 05b04ff36..0aa69c560 100644
--- a/src/qt/splashscreen.cpp
+++ b/src/qt/splashscreen.cpp
@@ -1,245 +1,247 @@
 // Copyright (c) 2011-2016 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #if defined(HAVE_CONFIG_H)
 #include <config/bitcoin-config.h>
 #endif
 
 #include <qt/splashscreen.h>
 
 #include <qt/networkstyle.h>
 
 #include <clientversion.h>
 #include <init.h>
 #include <interfaces/handler.h>
 #include <interfaces/node.h>
 #include <interfaces/wallet.h>
 #include <ui_interface.h>
 #include <util/system.h>
 #include <version.h>
 
 #include <QApplication>
 #include <QCloseEvent>
 #include <QDesktopWidget>
 #include <QPainter>
 #include <QRadialGradient>
 
 SplashScreen::SplashScreen(interfaces::Node &node, Qt::WindowFlags f,
                            const NetworkStyle *networkStyle)
     : QWidget(0, f), curAlignment(0), m_node(node) {
     // set reference point, paddings
     int paddingRight = 50;
     int paddingTop = 50;
     int titleVersionVSpace = 17;
     int titleCopyrightVSpace = 40;
 
     float fontFactor = 1.0;
     float devicePixelRatio = 1.0;
 #if QT_VERSION > 0x050100
     devicePixelRatio =
         static_cast<QGuiApplication *>(QCoreApplication::instance())
             ->devicePixelRatio();
 #endif
 
     // define text to place
     QString titleText = tr(PACKAGE_NAME);
     QString versionText =
         QString("Version %1").arg(QString::fromStdString(FormatFullVersion()));
     QString copyrightText = QString::fromUtf8(
         CopyrightHolders(strprintf("\xc2\xA9 %u-%u ", 2009, COPYRIGHT_YEAR))
             .c_str());
     QString titleAddText = networkStyle->getTitleAddText();
 
     QString font = QApplication::font().toString();
 
     // create a bitmap according to device pixelratio
     QSize splashSize(634 * devicePixelRatio, 320 * devicePixelRatio);
     pixmap = QPixmap(splashSize);
 
 #if QT_VERSION > 0x050100
     // change to HiDPI if it makes sense
     pixmap.setDevicePixelRatio(devicePixelRatio);
 #endif
 
     QPainter pixPaint(&pixmap);
     pixPaint.setPen(QColor(100, 100, 100));
 
     // draw a slightly radial gradient
     QRadialGradient gradient(QPoint(0, 0),
                              splashSize.width() / devicePixelRatio);
     gradient.setColorAt(0, Qt::white);
     gradient.setColorAt(1, QColor(247, 247, 247));
     QRect rGradient(QPoint(0, 0), splashSize);
     pixPaint.fillRect(rGradient, gradient);
 
     // draw the bitcoin icon, expected size of PNG: 1024x1024
     QRect rectIcon(QPoint(-10, -100), QSize(430, 430));
 
     const QSize requiredSize(1024, 1024);
     QPixmap icon(networkStyle->getAppIcon().pixmap(requiredSize));
 
     pixPaint.drawPixmap(rectIcon, icon);
 
     // check font size and drawing with
     pixPaint.setFont(QFont(font, 33 * fontFactor));
     QFontMetrics fm = pixPaint.fontMetrics();
     int titleTextWidth = fm.width(titleText);
     if (titleTextWidth > 176) {
         fontFactor = fontFactor * 176 / titleTextWidth;
     }
 
     pixPaint.setFont(QFont(font, 33 * fontFactor));
     fm = pixPaint.fontMetrics();
     titleTextWidth = fm.width(titleText);
     pixPaint.drawText(pixmap.width() / devicePixelRatio - titleTextWidth -
                           paddingRight,
                       paddingTop, titleText);
 
     pixPaint.setFont(QFont(font, 15 * fontFactor));
 
     // if the version string is to long, reduce size
     fm = pixPaint.fontMetrics();
     int versionTextWidth = fm.width(versionText);
     if (versionTextWidth > titleTextWidth + paddingRight - 10) {
         pixPaint.setFont(QFont(font, 10 * fontFactor));
         titleVersionVSpace -= 5;
     }
     pixPaint.drawText(pixmap.width() / devicePixelRatio - titleTextWidth -
                           paddingRight + 2,
                       paddingTop + titleVersionVSpace, versionText);
 
     // draw copyright stuff
     {
         pixPaint.setFont(QFont(font, 10 * fontFactor));
         const int x =
             pixmap.width() / devicePixelRatio - titleTextWidth - paddingRight;
         const int y = paddingTop + titleCopyrightVSpace;
         QRect copyrightRect(x, y, pixmap.width() - x - paddingRight,
                             pixmap.height() - y);
         pixPaint.drawText(copyrightRect,
                           Qt::AlignLeft | Qt::AlignTop | Qt::TextWordWrap,
                           copyrightText);
     }
 
     // draw additional text if special network
     if (!titleAddText.isEmpty()) {
         QFont boldFont = QFont(font, 10 * fontFactor);
         boldFont.setWeight(QFont::Bold);
         pixPaint.setFont(boldFont);
         fm = pixPaint.fontMetrics();
         int titleAddTextWidth = fm.width(titleAddText);
         pixPaint.drawText(pixmap.width() / devicePixelRatio -
                               titleAddTextWidth - 10,
                           15, titleAddText);
     }
 
     pixPaint.end();
 
     // Set window title
     setWindowTitle(titleText + " " + titleAddText);
 
     // Resize window and move to center of desktop, disallow resizing
     QRect r(QPoint(), QSize(pixmap.size().width() / devicePixelRatio,
                             pixmap.size().height() / devicePixelRatio));
     resize(r.size());
     setFixedSize(r.size());
     move(QApplication::desktop()->screenGeometry().center() - r.center());
 
     subscribeToCoreSignals();
     installEventFilter(this);
 }
 
 SplashScreen::~SplashScreen() {
     unsubscribeFromCoreSignals();
 }
 
 bool SplashScreen::eventFilter(QObject *obj, QEvent *ev) {
     if (ev->type() == QEvent::KeyPress) {
         QKeyEvent *keyEvent = static_cast<QKeyEvent *>(ev);
         if (keyEvent->text()[0] == 'q') {
             m_node.startShutdown();
         }
     }
     return QObject::eventFilter(obj, ev);
 }
 
 void SplashScreen::slotFinish(QWidget *mainWin) {
     Q_UNUSED(mainWin);
 
     /* If the window is minimized, hide() will be ignored. */
     /* Make sure we de-minimize the splashscreen window before hiding */
     if (isMinimized()) showNormal();
     hide();
     deleteLater(); // No more need for this
 }
 
 static void InitMessage(SplashScreen *splash, const std::string &message) {
     QMetaObject::invokeMethod(splash, "showMessage", Qt::QueuedConnection,
                               Q_ARG(QString, QString::fromStdString(message)),
                               Q_ARG(int, Qt::AlignBottom | Qt::AlignHCenter),
                               Q_ARG(QColor, QColor(55, 55, 55)));
 }
 
 static void ShowProgress(SplashScreen *splash, const std::string &title,
                          int nProgress, bool resume_possible) {
     InitMessage(splash, title + std::string("\n") +
                             (resume_possible
                                  ? _("(press q to shutdown and continue later)")
                                  : _("press q to shutdown")) +
                             strprintf("\n%d", nProgress) + "%");
 }
 #ifdef ENABLE_WALLET
 void SplashScreen::ConnectWallet(std::unique_ptr<interfaces::Wallet> wallet) {
     m_connected_wallet_handlers.emplace_back(wallet->handleShowProgress(
-        boost::bind(ShowProgress, this, _1, _2, false)));
+        std::bind(ShowProgress, this, std::placeholders::_1,
+                  std::placeholders::_2, false)));
     m_connected_wallets.emplace_back(std::move(wallet));
 }
 #endif
 
 void SplashScreen::subscribeToCoreSignals() {
     // Connect signals to client
-    m_handler_init_message =
-        m_node.handleInitMessage(boost::bind(InitMessage, this, _1));
-    m_handler_show_progress =
-        m_node.handleShowProgress(boost::bind(ShowProgress, this, _1, _2, _3));
+    m_handler_init_message = m_node.handleInitMessage(
+        std::bind(InitMessage, this, std::placeholders::_1));
+    m_handler_show_progress = m_node.handleShowProgress(
+        std::bind(ShowProgress, this, std::placeholders::_1,
+                  std::placeholders::_2, std::placeholders::_3));
 #ifdef ENABLE_WALLET
     m_handler_load_wallet = m_node.handleLoadWallet(
         [this](std::unique_ptr<interfaces::Wallet> wallet) {
             ConnectWallet(std::move(wallet));
         });
 #endif
 }
 
 void SplashScreen::unsubscribeFromCoreSignals() {
     // Disconnect signals from client
     m_handler_init_message->disconnect();
     m_handler_show_progress->disconnect();
     for (auto &handler : m_connected_wallet_handlers) {
         handler->disconnect();
     }
     m_connected_wallet_handlers.clear();
     m_connected_wallets.clear();
 }
 
 void SplashScreen::showMessage(const QString &message, int alignment,
                                const QColor &color) {
     curMessage = message;
     curAlignment = alignment;
     curColor = color;
     update();
 }
 
 void SplashScreen::paintEvent(QPaintEvent *event) {
     QPainter painter(this);
     painter.drawPixmap(0, 0, pixmap);
     QRect r = rect().adjusted(5, 5, -5, -5);
     painter.setPen(curColor);
     painter.drawText(r, curAlignment, curMessage);
 }
 
 void SplashScreen::closeEvent(QCloseEvent *event) {
     // allows an "emergency" shutdown during startup
     m_node.startShutdown();
     event->ignore();
 }
diff --git a/src/qt/transactiontablemodel.cpp b/src/qt/transactiontablemodel.cpp
index 446519b48..ec210b83a 100644
--- a/src/qt/transactiontablemodel.cpp
+++ b/src/qt/transactiontablemodel.cpp
@@ -1,769 +1,771 @@
 // Copyright (c) 2011-2016 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <qt/transactiontablemodel.h>
 
 #include <core_io.h>
 #include <interfaces/handler.h>
 #include <interfaces/node.h>
 #include <qt/addresstablemodel.h>
 #include <qt/guiconstants.h>
 #include <qt/guiutil.h>
 #include <qt/optionsmodel.h>
 #include <qt/platformstyle.h>
 #include <qt/transactiondesc.h>
 #include <qt/transactionrecord.h>
 #include <qt/walletmodel.h>
 #include <sync.h>
 #include <uint256.h>
 #include <util/system.h>
 #include <validation.h>
 
 #include <QColor>
 #include <QDateTime>
 #include <QDebug>
 #include <QIcon>
 #include <QList>
 
 // Amount column is right-aligned it contains numbers
 static int column_alignments[] = {
     Qt::AlignLeft | Qt::AlignVCenter, /* status */
     Qt::AlignLeft | Qt::AlignVCenter, /* watchonly */
     Qt::AlignLeft | Qt::AlignVCenter, /* date */
     Qt::AlignLeft | Qt::AlignVCenter, /* type */
     Qt::AlignLeft | Qt::AlignVCenter, /* address */
     Qt::AlignRight | Qt::AlignVCenter /* amount */
 };
 
 // Comparison operator for sort/binary search of model tx list
 struct TxLessThan {
     bool operator()(const TransactionRecord &a,
                     const TransactionRecord &b) const {
         return a.txid < b.txid;
     }
     bool operator()(const TransactionRecord &a, const TxId &b) const {
         return a.txid < b;
     }
     bool operator()(const TxId &a, const TransactionRecord &b) const {
         return a < b.txid;
     }
 };
 
 // Private implementation
 class TransactionTablePriv {
 public:
     TransactionTablePriv(TransactionTableModel *_parent) : parent(_parent) {}
 
     TransactionTableModel *parent;
 
     /* Local cache of wallet.
      * As it is in the same order as the CWallet, by definition this is sorted
      * by sha256.
      */
     QList<TransactionRecord> cachedWallet;
 
     /**
      * Query entire wallet anew from core.
      */
     void refreshWallet(interfaces::Wallet &wallet) {
         qDebug() << "TransactionTablePriv::refreshWallet";
         cachedWallet.clear();
         for (const auto &wtx : wallet.getWalletTxs()) {
             if (TransactionRecord::showTransaction()) {
                 cachedWallet.append(
                     TransactionRecord::decomposeTransaction(wtx));
             }
         }
     }
 
     /**
      * Update our model of the wallet incrementally, to synchronize our model of
      * the wallet with that of the core.
      * Call with transaction that was added, removed or changed.
      */
     void updateWallet(interfaces::Wallet &wallet, const TxId &txid, int status,
                       bool showTransaction) {
         qDebug() << "TransactionTablePriv::updateWallet: " +
                         QString::fromStdString(txid.ToString()) + " " +
                         QString::number(status);
 
         // Find bounds of this transaction in model
         QList<TransactionRecord>::iterator lower = qLowerBound(
             cachedWallet.begin(), cachedWallet.end(), txid, TxLessThan());
         QList<TransactionRecord>::iterator upper = qUpperBound(
             cachedWallet.begin(), cachedWallet.end(), txid, TxLessThan());
         int lowerIndex = (lower - cachedWallet.begin());
         int upperIndex = (upper - cachedWallet.begin());
         bool inModel = (lower != upper);
 
         if (status == CT_UPDATED) {
             // Not in model, but want to show, treat as new.
             if (showTransaction && !inModel) {
                 status = CT_NEW;
             }
             // In model, but want to hide, treat as deleted.
             if (!showTransaction && inModel) {
                 status = CT_DELETED;
             }
         }
 
         qDebug() << "    inModel=" + QString::number(inModel) +
                         " Index=" + QString::number(lowerIndex) + "-" +
                         QString::number(upperIndex) +
                         " showTransaction=" + QString::number(showTransaction) +
                         " derivedStatus=" + QString::number(status);
 
         switch (status) {
             case CT_NEW:
                 if (inModel) {
                     qWarning() << "TransactionTablePriv::updateWallet: "
                                   "Warning: Got CT_NEW, but transaction is "
                                   "already in model";
                     break;
                 }
                 if (showTransaction) {
                     // Find transaction in wallet
                     interfaces::WalletTx wtx = wallet.getWalletTx(txid);
                     if (!wtx.tx) {
                         qWarning() << "TransactionTablePriv::updateWallet: "
                                       "Warning: Got CT_NEW, but transaction is "
                                       "not in wallet";
                         break;
                     }
                     // Added -- insert at the right position
                     QList<TransactionRecord> toInsert =
                         TransactionRecord::decomposeTransaction(wtx);
                     /* only if something to insert */
                     if (!toInsert.isEmpty()) {
                         parent->beginInsertRows(QModelIndex(), lowerIndex,
                                                 lowerIndex + toInsert.size() -
                                                     1);
                         int insert_idx = lowerIndex;
                         for (const TransactionRecord &rec : toInsert) {
                             cachedWallet.insert(insert_idx, rec);
                             insert_idx += 1;
                         }
                         parent->endInsertRows();
                     }
                 }
                 break;
             case CT_DELETED:
                 if (!inModel) {
                     qWarning() << "TransactionTablePriv::updateWallet: "
                                   "Warning: Got CT_DELETED, but transaction is "
                                   "not in model";
                     break;
                 }
                 // Removed -- remove entire transaction from table
                 parent->beginRemoveRows(QModelIndex(), lowerIndex,
                                         upperIndex - 1);
                 cachedWallet.erase(lower, upper);
                 parent->endRemoveRows();
                 break;
             case CT_UPDATED:
                 // Miscellaneous updates -- nothing to do, status update will
                 // take care of this, and is only computed for visible
                 // transactions.
                 break;
         }
     }
 
     int size() { return cachedWallet.size(); }
 
     TransactionRecord *index(interfaces::Wallet &wallet, int idx) {
         if (idx >= 0 && idx < cachedWallet.size()) {
             TransactionRecord *rec = &cachedWallet[idx];
 
             // Get required locks upfront. This avoids the GUI from getting
             // stuck if the core is holding the locks for a longer time - for
             // example, during a wallet rescan.
             //
             // If a status update is needed (blocks came in since last check),
             // update the status of this transaction from the wallet. Otherwise,
             // simply re-use the cached status.
             interfaces::WalletTxStatus wtx;
             int numBlocks;
             int64_t block_time;
             if (wallet.tryGetTxStatus(rec->txid, wtx, numBlocks, block_time) &&
                 rec->statusUpdateNeeded(numBlocks)) {
                 rec->updateStatus(wtx, numBlocks, block_time);
             }
             return rec;
         }
         return 0;
     }
 
     QString describe(interfaces::Node &node, interfaces::Wallet &wallet,
                      TransactionRecord *rec, int unit) {
         return TransactionDesc::toHTML(node, wallet, rec, unit);
     }
 
     QString getTxHex(interfaces::Wallet &wallet, TransactionRecord *rec) {
         auto tx = wallet.getTx(rec->txid);
         if (tx) {
             std::string strHex = EncodeHexTx(*tx);
             return QString::fromStdString(strHex);
         }
         return QString();
     }
 };
 
 TransactionTableModel::TransactionTableModel(
     const PlatformStyle *_platformStyle, WalletModel *parent)
     : QAbstractTableModel(parent), walletModel(parent),
       priv(new TransactionTablePriv(this)),
       fProcessingQueuedTransactions(false), platformStyle(_platformStyle) {
     columns << QString() << QString() << tr("Date") << tr("Type") << tr("Label")
             << BitcoinUnits::getAmountColumnTitle(
                    walletModel->getOptionsModel()->getDisplayUnit());
     priv->refreshWallet(walletModel->wallet());
 
     connect(walletModel->getOptionsModel(), SIGNAL(displayUnitChanged(int)),
             this, SLOT(updateDisplayUnit()));
 
     subscribeToCoreSignals();
 }
 
 TransactionTableModel::~TransactionTableModel() {
     unsubscribeFromCoreSignals();
     delete priv;
 }
 
 /** Updates the column title to "Amount (DisplayUnit)" and emits
  * headerDataChanged() signal for table headers to react. */
 void TransactionTableModel::updateAmountColumnTitle() {
     columns[Amount] = BitcoinUnits::getAmountColumnTitle(
         walletModel->getOptionsModel()->getDisplayUnit());
     Q_EMIT headerDataChanged(Qt::Horizontal, Amount, Amount);
 }
 
 void TransactionTableModel::updateTransaction(const QString &hash, int status,
                                               bool showTransaction) {
     TxId updated;
     updated.SetHex(hash.toStdString());
 
     priv->updateWallet(walletModel->wallet(), updated, status, showTransaction);
 }
 
 void TransactionTableModel::updateConfirmations() {
     // Blocks came in since last poll.
     // Invalidate status (number of confirmations) and (possibly) description
     // for all rows. Qt is smart enough to only actually request the data for
     // the visible rows.
     Q_EMIT dataChanged(index(0, Status), index(priv->size() - 1, Status));
     Q_EMIT dataChanged(index(0, ToAddress), index(priv->size() - 1, ToAddress));
 }
 
 int TransactionTableModel::rowCount(const QModelIndex &parent) const {
     Q_UNUSED(parent);
     return priv->size();
 }
 
 int TransactionTableModel::columnCount(const QModelIndex &parent) const {
     Q_UNUSED(parent);
     return columns.length();
 }
 
 QString
 TransactionTableModel::formatTxStatus(const TransactionRecord *wtx) const {
     QString status;
 
     switch (wtx->status.status) {
         case TransactionStatus::OpenUntilBlock:
             status = tr("Open for %n more block(s)", "", wtx->status.open_for);
             break;
         case TransactionStatus::OpenUntilDate:
             status = tr("Open until %1")
                          .arg(GUIUtil::dateTimeStr(wtx->status.open_for));
             break;
         case TransactionStatus::Unconfirmed:
             status = tr("Unconfirmed");
             break;
         case TransactionStatus::Abandoned:
             status = tr("Abandoned");
             break;
         case TransactionStatus::Confirming:
             status = tr("Confirming (%1 of %2 recommended confirmations)")
                          .arg(wtx->status.depth)
                          .arg(TransactionRecord::RecommendedNumConfirmations);
             break;
         case TransactionStatus::Confirmed:
             status = tr("Confirmed (%1 confirmations)").arg(wtx->status.depth);
             break;
         case TransactionStatus::Conflicted:
             status = tr("Conflicted");
             break;
         case TransactionStatus::Immature:
             status =
                 tr("Immature (%1 confirmations, will be available after %2)")
                     .arg(wtx->status.depth)
                     .arg(wtx->status.depth + wtx->status.matures_in);
             break;
         case TransactionStatus::NotAccepted:
             status = tr("Generated but not accepted");
             break;
     }
 
     return status;
 }
 
 QString
 TransactionTableModel::formatTxDate(const TransactionRecord *wtx) const {
     if (wtx->time) {
         return GUIUtil::dateTimeStr(wtx->time);
     }
     return QString();
 }
 
 /**
  * Look up address in address book, if found return label (address)  otherwise
  * just return (address)
  */
 QString TransactionTableModel::lookupAddress(const std::string &address,
                                              bool tooltip) const {
     QString label = walletModel->getAddressTableModel()->labelForAddress(
         QString::fromStdString(address));
     QString description;
     if (!label.isEmpty()) {
         description += label;
     }
     if (label.isEmpty() || tooltip) {
         description +=
             QString(" (") + QString::fromStdString(address) + QString(")");
     }
     return description;
 }
 
 QString
 TransactionTableModel::formatTxType(const TransactionRecord *wtx) const {
     switch (wtx->type) {
         case TransactionRecord::RecvWithAddress:
             return tr("Received with");
         case TransactionRecord::RecvFromOther:
             return tr("Received from");
         case TransactionRecord::SendToAddress:
         case TransactionRecord::SendToOther:
             return tr("Sent to");
         case TransactionRecord::SendToSelf:
             return tr("Payment to yourself");
         case TransactionRecord::Generated:
             return tr("Mined");
         default:
             return QString();
     }
 }
 
 QVariant
 TransactionTableModel::txAddressDecoration(const TransactionRecord *wtx) const {
     switch (wtx->type) {
         case TransactionRecord::Generated:
             return QIcon(":/icons/tx_mined");
         case TransactionRecord::RecvWithAddress:
         case TransactionRecord::RecvFromOther:
             return QIcon(":/icons/tx_input");
         case TransactionRecord::SendToAddress:
         case TransactionRecord::SendToOther:
             return QIcon(":/icons/tx_output");
         default:
             return QIcon(":/icons/tx_inout");
     }
 }
 
 QString TransactionTableModel::formatTxToAddress(const TransactionRecord *wtx,
                                                  bool tooltip) const {
     QString watchAddress;
     if (tooltip) {
         // Mark transactions involving watch-only addresses by adding "
         // (watch-only)"
         watchAddress = wtx->involvesWatchAddress
                            ? QString(" (") + tr("watch-only") + QString(")")
                            : "";
     }
 
     switch (wtx->type) {
         case TransactionRecord::RecvFromOther:
             return QString::fromStdString(wtx->address) + watchAddress;
         case TransactionRecord::RecvWithAddress:
         case TransactionRecord::SendToAddress:
         case TransactionRecord::Generated:
             return lookupAddress(wtx->address, tooltip) + watchAddress;
         case TransactionRecord::SendToOther:
             return QString::fromStdString(wtx->address) + watchAddress;
         case TransactionRecord::SendToSelf:
         default:
             return tr("(n/a)") + watchAddress;
     }
 }
 
 QVariant
 TransactionTableModel::addressColor(const TransactionRecord *wtx) const {
     // Show addresses without label in a less visible color
     switch (wtx->type) {
         case TransactionRecord::RecvWithAddress:
         case TransactionRecord::SendToAddress:
         case TransactionRecord::Generated: {
             QString label =
                 walletModel->getAddressTableModel()->labelForAddress(
                     QString::fromStdString(wtx->address));
             if (label.isEmpty()) return COLOR_BAREADDRESS;
         } break;
         case TransactionRecord::SendToSelf:
             return COLOR_BAREADDRESS;
         default:
             break;
     }
     return QVariant();
 }
 
 QString TransactionTableModel::formatTxAmount(
     const TransactionRecord *wtx, bool showUnconfirmed,
     BitcoinUnits::SeparatorStyle separators) const {
     QString str =
         BitcoinUnits::format(walletModel->getOptionsModel()->getDisplayUnit(),
                              wtx->credit + wtx->debit, false, separators);
     if (showUnconfirmed) {
         if (!wtx->status.countsForBalance) {
             str = QString("[") + str + QString("]");
         }
     }
     return QString(str);
 }
 
 QVariant
 TransactionTableModel::txStatusDecoration(const TransactionRecord *wtx) const {
     switch (wtx->status.status) {
         case TransactionStatus::OpenUntilBlock:
         case TransactionStatus::OpenUntilDate:
             return COLOR_TX_STATUS_OPENUNTILDATE;
         case TransactionStatus::Unconfirmed:
             return QIcon(":/icons/transaction_0");
         case TransactionStatus::Abandoned:
             return QIcon(":/icons/transaction_abandoned");
         case TransactionStatus::Confirming:
             switch (wtx->status.depth) {
                 case 1:
                     return QIcon(":/icons/transaction_1");
                 case 2:
                     return QIcon(":/icons/transaction_2");
                 case 3:
                     return QIcon(":/icons/transaction_3");
                 case 4:
                     return QIcon(":/icons/transaction_4");
                 default:
                     return QIcon(":/icons/transaction_5");
             };
         case TransactionStatus::Confirmed:
             return QIcon(":/icons/transaction_confirmed");
         case TransactionStatus::Conflicted:
             return QIcon(":/icons/transaction_conflicted");
         case TransactionStatus::Immature: {
             int total = wtx->status.depth + wtx->status.matures_in;
             int part = (wtx->status.depth * 4 / total) + 1;
             return QIcon(QString(":/icons/transaction_%1").arg(part));
         }
         case TransactionStatus::NotAccepted:
             return QIcon(":/icons/transaction_0");
         default:
             return COLOR_BLACK;
     }
 }
 
 QVariant TransactionTableModel::txWatchonlyDecoration(
     const TransactionRecord *wtx) const {
     if (wtx->involvesWatchAddress) {
         return QIcon(":/icons/eye");
     }
 
     return QVariant();
 }
 
 QString
 TransactionTableModel::formatTooltip(const TransactionRecord *rec) const {
     QString tooltip = formatTxStatus(rec) + QString("\n") + formatTxType(rec);
     if (rec->type == TransactionRecord::RecvFromOther ||
         rec->type == TransactionRecord::SendToOther ||
         rec->type == TransactionRecord::SendToAddress ||
         rec->type == TransactionRecord::RecvWithAddress) {
         tooltip += QString(" ") + formatTxToAddress(rec, true);
     }
     return tooltip;
 }
 
 QVariant TransactionTableModel::data(const QModelIndex &index, int role) const {
     if (!index.isValid()) {
         return QVariant();
     }
 
     TransactionRecord *rec =
         static_cast<TransactionRecord *>(index.internalPointer());
 
     switch (role) {
         case RawDecorationRole:
             switch (index.column()) {
                 case Status:
                     return txStatusDecoration(rec);
                 case Watchonly:
                     return txWatchonlyDecoration(rec);
                 case ToAddress:
                     return txAddressDecoration(rec);
             }
             break;
         case Qt::DecorationRole: {
             QIcon icon = qvariant_cast<QIcon>(index.data(RawDecorationRole));
             return platformStyle->TextColorIcon(icon);
         }
         case Qt::DisplayRole:
             switch (index.column()) {
                 case Date:
                     return formatTxDate(rec);
                 case Type:
                     return formatTxType(rec);
                 case ToAddress:
                     return formatTxToAddress(rec, false);
                 case Amount:
                     return formatTxAmount(rec, true,
                                           BitcoinUnits::separatorAlways);
             }
             break;
         case Qt::EditRole:
             // Edit role is used for sorting, so return the unformatted values
             switch (index.column()) {
                 case Status:
                     return QString::fromStdString(rec->status.sortKey);
                 case Date:
                     return rec->time;
                 case Type:
                     return formatTxType(rec);
                 case Watchonly:
                     return (rec->involvesWatchAddress ? 1 : 0);
                 case ToAddress:
                     return formatTxToAddress(rec, true);
                 case Amount:
                     return qint64((rec->credit + rec->debit) / SATOSHI);
             }
             break;
         case Qt::ToolTipRole:
             return formatTooltip(rec);
         case Qt::TextAlignmentRole:
             return column_alignments[index.column()];
         case Qt::ForegroundRole:
             // Use the "danger" color for abandoned transactions
             if (rec->status.status == TransactionStatus::Abandoned) {
                 return COLOR_TX_STATUS_DANGER;
             }
             // Non-confirmed (but not immature) as transactions are grey
             if (!rec->status.countsForBalance &&
                 rec->status.status != TransactionStatus::Immature) {
                 return COLOR_UNCONFIRMED;
             }
             if (index.column() == Amount &&
                 (rec->credit + rec->debit) < ::Amount::zero()) {
                 return COLOR_NEGATIVE;
             }
             if (index.column() == ToAddress) {
                 return addressColor(rec);
             }
             break;
         case TypeRole:
             return rec->type;
         case DateRole:
             return QDateTime::fromTime_t(static_cast<uint>(rec->time));
         case WatchonlyRole:
             return rec->involvesWatchAddress;
         case WatchonlyDecorationRole:
             return txWatchonlyDecoration(rec);
         case LongDescriptionRole:
             return priv->describe(
                 walletModel->node(), walletModel->wallet(), rec,
                 walletModel->getOptionsModel()->getDisplayUnit());
         case AddressRole:
             return QString::fromStdString(rec->address);
         case LabelRole:
             return walletModel->getAddressTableModel()->labelForAddress(
                 QString::fromStdString(rec->address));
         case AmountRole:
             return qint64((rec->credit + rec->debit) / SATOSHI);
         case TxIDRole:
             return rec->getTxID();
         case TxHashRole:
             return QString::fromStdString(rec->txid.ToString());
         case TxHexRole:
             return priv->getTxHex(walletModel->wallet(), rec);
         case TxPlainTextRole: {
             QString details;
             QDateTime date =
                 QDateTime::fromTime_t(static_cast<uint>(rec->time));
             QString txLabel =
                 walletModel->getAddressTableModel()->labelForAddress(
                     QString::fromStdString(rec->address));
 
             details.append(date.toString("M/d/yy HH:mm"));
             details.append(" ");
             details.append(formatTxStatus(rec));
             details.append(". ");
             if (!formatTxType(rec).isEmpty()) {
                 details.append(formatTxType(rec));
                 details.append(" ");
             }
             if (!rec->address.empty()) {
                 if (txLabel.isEmpty()) {
                     details.append(tr("(no label)") + " ");
                 } else {
                     details.append("(");
                     details.append(txLabel);
                     details.append(") ");
                 }
                 details.append(QString::fromStdString(rec->address));
                 details.append(" ");
             }
             details.append(
                 formatTxAmount(rec, false, BitcoinUnits::separatorNever));
             return details;
         }
         case ConfirmedRole:
             return rec->status.countsForBalance;
         case FormattedAmountRole:
             // Used for copy/export, so don't include separators
             return formatTxAmount(rec, false, BitcoinUnits::separatorNever);
         case StatusRole:
             return rec->status.status;
     }
     return QVariant();
 }
 
 QVariant TransactionTableModel::headerData(int section,
                                            Qt::Orientation orientation,
                                            int role) const {
     if (orientation == Qt::Horizontal) {
         if (role == Qt::DisplayRole) {
             return columns[section];
         } else if (role == Qt::TextAlignmentRole) {
             return column_alignments[section];
         } else if (role == Qt::ToolTipRole) {
             switch (section) {
                 case Status:
                     return tr("Transaction status. Hover over this field to "
                               "show number of confirmations.");
                 case Date:
                     return tr(
                         "Date and time that the transaction was received.");
                 case Type:
                     return tr("Type of transaction.");
                 case Watchonly:
                     return tr("Whether or not a watch-only address is involved "
                               "in this transaction.");
                 case ToAddress:
                     return tr(
                         "User-defined intent/purpose of the transaction.");
                 case Amount:
                     return tr("Amount removed from or added to balance.");
             }
         }
     }
     return QVariant();
 }
 
 QModelIndex TransactionTableModel::index(int row, int column,
                                          const QModelIndex &parent) const {
     Q_UNUSED(parent);
     TransactionRecord *data = priv->index(walletModel->wallet(), row);
     if (data) {
         return createIndex(row, column,
                            priv->index(walletModel->wallet(), row));
     }
     return QModelIndex();
 }
 
 void TransactionTableModel::updateDisplayUnit() {
     // emit dataChanged to update Amount column with the current unit
     updateAmountColumnTitle();
     Q_EMIT dataChanged(index(0, Amount), index(priv->size() - 1, Amount));
 }
 
 // queue notifications to show a non freezing progress dialog e.g. for rescan
 struct TransactionNotification {
 public:
     TransactionNotification() {}
     TransactionNotification(TxId _txid, ChangeType _status,
                             bool _showTransaction)
         : txid(_txid), status(_status), showTransaction(_showTransaction) {}
 
     void invoke(QObject *ttm) {
         QString strHash = QString::fromStdString(txid.GetHex());
         qDebug() << "NotifyTransactionChanged: " + strHash +
                         " status= " + QString::number(status);
         QMetaObject::invokeMethod(ttm, "updateTransaction",
                                   Qt::QueuedConnection, Q_ARG(QString, strHash),
                                   Q_ARG(int, status),
                                   Q_ARG(bool, showTransaction));
     }
 
 private:
     TxId txid;
     ChangeType status;
     bool showTransaction;
 };
 
 static bool fQueueNotifications = false;
 static std::vector<TransactionNotification> vQueueNotifications;
 
 static void NotifyTransactionChanged(TransactionTableModel *ttm,
                                      const TxId &txid, ChangeType status) {
     // Find transaction in wallet
     // Determine whether to show transaction or not (determine this here so that
     // no relocking is needed in GUI thread)
     bool showTransaction = TransactionRecord::showTransaction();
 
     TransactionNotification notification(txid, status, showTransaction);
 
     if (fQueueNotifications) {
         vQueueNotifications.push_back(notification);
         return;
     }
     notification.invoke(ttm);
 }
 
 static void ShowProgress(TransactionTableModel *ttm, const std::string &title,
                          int nProgress) {
     if (nProgress == 0) {
         fQueueNotifications = true;
     }
 
     if (nProgress == 100) {
         fQueueNotifications = false;
         if (vQueueNotifications.size() > 10) {
             // prevent balloon spam, show maximum 10 balloons
             QMetaObject::invokeMethod(ttm, "setProcessingQueuedTransactions",
                                       Qt::QueuedConnection, Q_ARG(bool, true));
         }
 
         for (size_t i = 0; i < vQueueNotifications.size(); ++i) {
             if (vQueueNotifications.size() - i <= 10) {
                 QMetaObject::invokeMethod(
                     ttm, "setProcessingQueuedTransactions",
                     Qt::QueuedConnection, Q_ARG(bool, false));
             }
 
             vQueueNotifications[i].invoke(ttm);
         }
 
         // clear
         std::vector<TransactionNotification>().swap(vQueueNotifications);
     }
 }
 
 void TransactionTableModel::subscribeToCoreSignals() {
     // Connect signals to wallet
     m_handler_transaction_changed =
         walletModel->wallet().handleTransactionChanged(
-            boost::bind(NotifyTransactionChanged, this, _1, _2));
-    m_handler_show_progress = walletModel->wallet().handleShowProgress(
-        boost::bind(ShowProgress, this, _1, _2));
+            std::bind(NotifyTransactionChanged, this, std::placeholders::_1,
+                      std::placeholders::_2));
+    m_handler_show_progress =
+        walletModel->wallet().handleShowProgress(std::bind(
+            ShowProgress, this, std::placeholders::_1, std::placeholders::_2));
 }
 
 void TransactionTableModel::unsubscribeFromCoreSignals() {
     // Disconnect signals from wallet
     m_handler_transaction_changed->disconnect();
     m_handler_show_progress->disconnect();
 }
diff --git a/src/qt/walletmodel.cpp b/src/qt/walletmodel.cpp
index a7bc3482e..6df254bae 100644
--- a/src/qt/walletmodel.cpp
+++ b/src/qt/walletmodel.cpp
@@ -1,477 +1,480 @@
 // Copyright (c) 2011-2016 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <qt/walletmodel.h>
 
 #include <cashaddrenc.h>
 #include <interfaces/handler.h>
 #include <interfaces/node.h>
 #include <key_io.h>
 #include <qt/addresstablemodel.h>
 #include <qt/guiconstants.h>
 #include <qt/paymentserver.h>
 #include <qt/recentrequeststablemodel.h>
 #include <qt/transactiontablemodel.h>
 #include <ui_interface.h>
 #include <util/system.h> // for GetBoolArg
 #include <wallet/coincontrol.h>
 #include <wallet/wallet.h>
 
 #include <QDebug>
 #include <QSet>
 #include <QTimer>
 
 #include <cstdint>
 
 WalletModel::WalletModel(std::unique_ptr<interfaces::Wallet> wallet,
                          interfaces::Node &node,
                          const PlatformStyle *platformStyle,
                          OptionsModel *_optionsModel, QObject *parent)
     : QObject(parent), m_wallet(std::move(wallet)), m_node(node),
       optionsModel(_optionsModel), addressTableModel(0),
       transactionTableModel(0), recentRequestsTableModel(0),
       cachedEncryptionStatus(Unencrypted), cachedNumBlocks(0) {
     fHaveWatchOnly = m_wallet->haveWatchOnly();
     addressTableModel = new AddressTableModel(this);
     transactionTableModel = new TransactionTableModel(platformStyle, this);
     recentRequestsTableModel = new RecentRequestsTableModel(this);
 
     // This timer will be fired repeatedly to update the balance
     pollTimer = new QTimer(this);
     connect(pollTimer, SIGNAL(timeout()), this, SLOT(pollBalanceChanged()));
     pollTimer->start(MODEL_UPDATE_DELAY);
 
     subscribeToCoreSignals();
 }
 
 WalletModel::~WalletModel() {
     unsubscribeFromCoreSignals();
 }
 
 void WalletModel::updateStatus() {
     EncryptionStatus newEncryptionStatus = getEncryptionStatus();
 
     if (cachedEncryptionStatus != newEncryptionStatus) {
         Q_EMIT encryptionStatusChanged();
     }
 }
 
 void WalletModel::pollBalanceChanged() {
     // Try to get balances and return early if locks can't be acquired. This
     // avoids the GUI from getting stuck on periodical polls if the core is
     // holding the locks for a longer time - for example, during a wallet
     // rescan.
     interfaces::WalletBalances new_balances;
     int numBlocks = -1;
     if (!m_wallet->tryGetBalances(new_balances, numBlocks)) {
         return;
     }
 
     if (fForceCheckBalanceChanged || m_node.getNumBlocks() != cachedNumBlocks) {
         fForceCheckBalanceChanged = false;
 
         // Balance and number of transactions might have changed
         cachedNumBlocks = m_node.getNumBlocks();
 
         checkBalanceChanged(new_balances);
         if (transactionTableModel) {
             transactionTableModel->updateConfirmations();
         }
     }
 }
 
 void WalletModel::checkBalanceChanged(
     const interfaces::WalletBalances &new_balances) {
     if (new_balances.balanceChanged(m_cached_balances)) {
         m_cached_balances = new_balances;
         Q_EMIT balanceChanged(new_balances);
     }
 }
 
 void WalletModel::updateTransaction() {
     // Balance and number of transactions might have changed
     fForceCheckBalanceChanged = true;
 }
 
 void WalletModel::updateAddressBook(const QString &address,
                                     const QString &label, bool isMine,
                                     const QString &purpose, int status) {
     if (addressTableModel) {
         addressTableModel->updateEntry(address, label, isMine, purpose, status);
     }
 }
 
 void WalletModel::updateWatchOnlyFlag(bool fHaveWatchonly) {
     fHaveWatchOnly = fHaveWatchonly;
     Q_EMIT notifyWatchonlyChanged(fHaveWatchonly);
 }
 
 bool WalletModel::validateAddress(const QString &address) {
     return IsValidDestinationString(address.toStdString(), getChainParams());
 }
 
 WalletModel::SendCoinsReturn
 WalletModel::prepareTransaction(WalletModelTransaction &transaction,
                                 const CCoinControl &coinControl) {
     Amount total = Amount::zero();
     bool fSubtractFeeFromAmount = false;
     QList<SendCoinsRecipient> recipients = transaction.getRecipients();
     std::vector<CRecipient> vecSend;
 
     if (recipients.empty()) {
         return OK;
     }
 
     // Used to detect duplicates
     QSet<QString> setAddress;
     int nAddresses = 0;
 
     // Pre-check input data for validity
     for (const SendCoinsRecipient &rcp : recipients) {
         if (rcp.fSubtractFeeFromAmount) fSubtractFeeFromAmount = true;
 
         // PaymentRequest...
         if (rcp.paymentRequest.IsInitialized()) {
             Amount subtotal = Amount::zero();
             const payments::PaymentDetails &details =
                 rcp.paymentRequest.getDetails();
             for (int i = 0; i < details.outputs_size(); i++) {
                 const payments::Output &out = details.outputs(i);
                 if (out.amount() <= 0) {
                     continue;
                 }
 
                 subtotal += int64_t(out.amount()) * SATOSHI;
                 const uint8_t *scriptStr = (const uint8_t *)out.script().data();
                 CScript scriptPubKey(scriptStr,
                                      scriptStr + out.script().size());
                 Amount nAmount = int64_t(out.amount()) * SATOSHI;
                 CRecipient recipient = {scriptPubKey, nAmount,
                                         rcp.fSubtractFeeFromAmount};
                 vecSend.push_back(recipient);
             }
 
             if (subtotal <= Amount::zero()) {
                 return InvalidAmount;
             }
             total += subtotal;
         } else {
             // User-entered bitcoin address / amount:
             if (!validateAddress(rcp.address)) {
                 return InvalidAddress;
             }
             if (rcp.amount <= Amount::zero()) {
                 return InvalidAmount;
             }
             setAddress.insert(rcp.address);
             ++nAddresses;
 
             CScript scriptPubKey = GetScriptForDestination(
                 DecodeDestination(rcp.address.toStdString(), getChainParams()));
             CRecipient recipient = {scriptPubKey, Amount(rcp.amount),
                                     rcp.fSubtractFeeFromAmount};
             vecSend.push_back(recipient);
 
             total += rcp.amount;
         }
     }
     if (setAddress.size() != nAddresses) {
         return DuplicateAddress;
     }
 
     Amount nBalance = m_wallet->getAvailableBalance(coinControl);
 
     if (total > nBalance) {
         return AmountExceedsBalance;
     }
 
     Amount nFeeRequired = Amount::zero();
     int nChangePosRet = -1;
     std::string strFailReason;
 
     auto &newTx = transaction.getWtx();
     newTx =
         m_wallet->createTransaction(vecSend, coinControl, true /* sign */,
                                     nChangePosRet, nFeeRequired, strFailReason);
     transaction.setTransactionFee(nFeeRequired);
     if (fSubtractFeeFromAmount && newTx) {
         transaction.reassignAmounts(nChangePosRet);
     }
 
     if (!newTx) {
         if (!fSubtractFeeFromAmount && (total + nFeeRequired) > nBalance) {
             return SendCoinsReturn(AmountWithFeeExceedsBalance);
         }
         Q_EMIT message(tr("Send Coins"), QString::fromStdString(strFailReason),
                        CClientUIInterface::MSG_ERROR);
         return TransactionCreationFailed;
     }
 
     // reject absurdly high fee. (This can never happen because the
     // wallet caps the fee at maxTxFee. This merely serves as a
     // belt-and-suspenders check)
     if (nFeeRequired > m_node.getMaxTxFee()) {
         return AbsurdFee;
     }
 
     return SendCoinsReturn(OK);
 }
 
 WalletModel::SendCoinsReturn
 WalletModel::sendCoins(WalletModelTransaction &transaction) {
     /* store serialized transaction */
     QByteArray transaction_array;
 
     std::vector<std::pair<std::string, std::string>> vOrderForm;
     for (const SendCoinsRecipient &rcp : transaction.getRecipients()) {
         if (rcp.paymentRequest.IsInitialized()) {
             // Make sure any payment requests involved are still valid.
             if (PaymentServer::verifyExpired(rcp.paymentRequest.getDetails())) {
                 return PaymentRequestExpired;
             }
 
             // Store PaymentRequests in wtx.vOrderForm in wallet.
             std::string value;
             rcp.paymentRequest.SerializeToString(&value);
             vOrderForm.emplace_back("PaymentRequest", std::move(value));
         } else if (!rcp.message.isEmpty()) {
             // Message from normal bitcoincash:URI
             // (bitcoincash:123...?message=example)
             vOrderForm.emplace_back("Message", rcp.message.toStdString());
         }
     }
 
     auto &newTx = transaction.getWtx();
     std::string rejectReason;
     if (!newTx->commit({} /* mapValue */, std::move(vOrderForm),
                        {} /* fromAccount */, rejectReason)) {
         return SendCoinsReturn(TransactionCommitFailed,
                                QString::fromStdString(rejectReason));
     }
 
     CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
     ssTx << newTx->get();
     transaction_array.append(&(ssTx[0]), ssTx.size());
 
     // Add addresses / update labels that we've sent to the address book, and
     // emit coinsSent signal for each recipient
     for (const SendCoinsRecipient &rcp : transaction.getRecipients()) {
         // Don't touch the address book when we have a payment request
         if (!rcp.paymentRequest.IsInitialized()) {
             std::string strAddress = rcp.address.toStdString();
             CTxDestination dest =
                 DecodeDestination(strAddress, getChainParams());
             std::string strLabel = rcp.label.toStdString();
             // Check if we have a new address or an updated label
             std::string name;
             if (!m_wallet->getAddress(dest, &name, /* is_mine= */ nullptr,
                                       /* purpose= */ nullptr)) {
                 m_wallet->setAddressBook(dest, strLabel, "send");
             } else if (name != strLabel) {
                 // "" means don't change purpose
                 m_wallet->setAddressBook(dest, strLabel, "");
             }
         }
         Q_EMIT coinsSent(this, rcp, transaction_array);
     }
 
     // update balance immediately, otherwise there could be a short noticeable
     // delay until pollBalanceChanged hits
     checkBalanceChanged(m_wallet->getBalances());
 
     return SendCoinsReturn(OK);
 }
 
 OptionsModel *WalletModel::getOptionsModel() {
     return optionsModel;
 }
 
 AddressTableModel *WalletModel::getAddressTableModel() {
     return addressTableModel;
 }
 
 TransactionTableModel *WalletModel::getTransactionTableModel() {
     return transactionTableModel;
 }
 
 RecentRequestsTableModel *WalletModel::getRecentRequestsTableModel() {
     return recentRequestsTableModel;
 }
 
 WalletModel::EncryptionStatus WalletModel::getEncryptionStatus() const {
     if (!m_wallet->isCrypted()) {
         return Unencrypted;
     } else if (m_wallet->isLocked()) {
         return Locked;
     } else {
         return Unlocked;
     }
 }
 
 bool WalletModel::setWalletEncrypted(bool encrypted,
                                      const SecureString &passphrase) {
     if (encrypted) {
         // Encrypt
         return m_wallet->encryptWallet(passphrase);
     } else {
         // Decrypt -- TODO; not supported yet
         return false;
     }
 }
 
 bool WalletModel::setWalletLocked(bool locked, const SecureString &passPhrase) {
     if (locked) {
         // Lock
         return m_wallet->lock();
     } else {
         // Unlock
         return m_wallet->unlock(passPhrase);
     }
 }
 
 bool WalletModel::changePassphrase(const SecureString &oldPass,
                                    const SecureString &newPass) {
     // Make sure wallet is locked before attempting pass change
     m_wallet->lock();
     return m_wallet->changeWalletPassphrase(oldPass, newPass);
 }
 
 // Handlers for core signals
 static void NotifyKeyStoreStatusChanged(WalletModel *walletmodel) {
     qDebug() << "NotifyKeyStoreStatusChanged";
     QMetaObject::invokeMethod(walletmodel, "updateStatus",
                               Qt::QueuedConnection);
 }
 
 static void NotifyAddressBookChanged(WalletModel *walletmodel,
                                      const CTxDestination &address,
                                      const std::string &label, bool isMine,
                                      const std::string &purpose,
                                      ChangeType status) {
     QString strAddress = QString::fromStdString(
         EncodeCashAddr(address, walletmodel->getChainParams()));
     QString strLabel = QString::fromStdString(label);
     QString strPurpose = QString::fromStdString(purpose);
 
     qDebug() << "NotifyAddressBookChanged: " + strAddress + " " + strLabel +
                     " isMine=" + QString::number(isMine) +
                     " purpose=" + strPurpose +
                     " status=" + QString::number(status);
     QMetaObject::invokeMethod(walletmodel, "updateAddressBook",
                               Qt::QueuedConnection, Q_ARG(QString, strAddress),
                               Q_ARG(QString, strLabel), Q_ARG(bool, isMine),
                               Q_ARG(QString, strPurpose), Q_ARG(int, status));
 }
 
 static void NotifyTransactionChanged(WalletModel *walletmodel, const TxId &hash,
                                      ChangeType status) {
     Q_UNUSED(hash);
     Q_UNUSED(status);
     QMetaObject::invokeMethod(walletmodel, "updateTransaction",
                               Qt::QueuedConnection);
 }
 
 static void ShowProgress(WalletModel *walletmodel, const std::string &title,
                          int nProgress) {
     // emits signal "showProgress"
     QMetaObject::invokeMethod(walletmodel, "showProgress", Qt::QueuedConnection,
                               Q_ARG(QString, QString::fromStdString(title)),
                               Q_ARG(int, nProgress));
 }
 
 static void NotifyWatchonlyChanged(WalletModel *walletmodel,
                                    bool fHaveWatchonly) {
     QMetaObject::invokeMethod(walletmodel, "updateWatchOnlyFlag",
                               Qt::QueuedConnection,
                               Q_ARG(bool, fHaveWatchonly));
 }
 
 void WalletModel::subscribeToCoreSignals() {
     // Connect signals to wallet
     m_handler_status_changed = m_wallet->handleStatusChanged(
-        boost::bind(&NotifyKeyStoreStatusChanged, this));
+        std::bind(&NotifyKeyStoreStatusChanged, this));
     m_handler_address_book_changed = m_wallet->handleAddressBookChanged(
-        boost::bind(NotifyAddressBookChanged, this, _1, _2, _3, _4, _5));
+        std::bind(NotifyAddressBookChanged, this, std::placeholders::_1,
+                  std::placeholders::_2, std::placeholders::_3,
+                  std::placeholders::_4, std::placeholders::_5));
     m_handler_transaction_changed = m_wallet->handleTransactionChanged(
-        boost::bind(NotifyTransactionChanged, this, _1, _2));
-    m_handler_show_progress =
-        m_wallet->handleShowProgress(boost::bind(ShowProgress, this, _1, _2));
+        std::bind(NotifyTransactionChanged, this, std::placeholders::_1,
+                  std::placeholders::_2));
+    m_handler_show_progress = m_wallet->handleShowProgress(std::bind(
+        ShowProgress, this, std::placeholders::_1, std::placeholders::_2));
     m_handler_watch_only_changed = m_wallet->handleWatchOnlyChanged(
-        boost::bind(NotifyWatchonlyChanged, this, _1));
+        std::bind(NotifyWatchonlyChanged, this, std::placeholders::_1));
 }
 
 void WalletModel::unsubscribeFromCoreSignals() {
     // Disconnect signals from wallet
     m_handler_status_changed->disconnect();
     m_handler_address_book_changed->disconnect();
     m_handler_transaction_changed->disconnect();
     m_handler_show_progress->disconnect();
     m_handler_watch_only_changed->disconnect();
 }
 
 // WalletModel::UnlockContext implementation
 WalletModel::UnlockContext WalletModel::requestUnlock() {
     bool was_locked = getEncryptionStatus() == Locked;
     if (was_locked) {
         // Request UI to unlock wallet
         Q_EMIT requireUnlock();
     }
     // If wallet is still locked, unlock was failed or cancelled, mark context
     // as invalid
     bool valid = getEncryptionStatus() != Locked;
 
     return UnlockContext(this, valid, was_locked);
 }
 
 WalletModel::UnlockContext::UnlockContext(WalletModel *_wallet, bool _valid,
                                           bool _relock)
     : wallet(_wallet), valid(_valid), relock(_relock) {}
 
 WalletModel::UnlockContext::~UnlockContext() {
     if (valid && relock) {
         wallet->setWalletLocked(true);
     }
 }
 
 void WalletModel::UnlockContext::CopyFrom(const UnlockContext &rhs) {
     // Transfer context; old object no longer relocks wallet
     *this = rhs;
     rhs.relock = false;
 }
 
 void WalletModel::loadReceiveRequests(
     std::vector<std::string> &vReceiveRequests) {
     // receive request
     vReceiveRequests = m_wallet->getDestValues("rr");
 }
 
 bool WalletModel::saveReceiveRequest(const std::string &sAddress,
                                      const int64_t nId,
                                      const std::string &sRequest) {
     CTxDestination dest = DecodeDestination(sAddress, getChainParams());
 
     std::stringstream ss;
     ss << nId;
     // "rr" prefix = "receive request" in destdata
     std::string key = "rr" + ss.str();
 
     return sRequest.empty() ? m_wallet->eraseDestData(dest, key)
                             : m_wallet->addDestData(dest, key, sRequest);
 }
 
 bool WalletModel::isWalletEnabled() {
     return !gArgs.GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET);
 }
 
 QString WalletModel::getWalletName() const {
     return QString::fromStdString(m_wallet->getWalletName());
 }
 
 bool WalletModel::isMultiwallet() {
     return m_node.getWallets().size() > 1;
 }
 
 const CChainParams &WalletModel::getChainParams() const {
     return Params();
 }
diff --git a/src/rpc/server.cpp b/src/rpc/server.cpp
index eb970fe13..01c8c40e6 100644
--- a/src/rpc/server.cpp
+++ b/src/rpc/server.cpp
@@ -1,596 +1,595 @@
 // Copyright (c) 2010 Satoshi Nakamoto
 // Copyright (c) 2009-2016 The Bitcoin Core developers
 // Copyright (c) 2018-2019 The Bitcoin developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <rpc/server.h>
 
 #include <config.h>
 #include <fs.h>
 #include <init.h>
 #include <key_io.h>
 #include <random.h>
 #include <sync.h>
 #include <ui_interface.h>
 #include <util/strencodings.h>
 #include <util/system.h>
 
 #include <univalue.h>
 
 #include <boost/algorithm/string/classification.hpp>
 #include <boost/algorithm/string/split.hpp>
-#include <boost/bind.hpp>
 #include <boost/signals2/signal.hpp>
 
 #include <memory> // for unique_ptr
 #include <set>
 #include <unordered_map>
 
 static bool fRPCRunning = false;
 static bool fRPCInWarmup = true;
 static std::string rpcWarmupStatus("RPC server started");
 static CCriticalSection cs_rpcWarmup;
 /* Timer-creating functions */
 static RPCTimerInterface *timerInterface = nullptr;
 /* Map of name to timer. */
 static std::map<std::string, std::unique_ptr<RPCTimerBase>> deadlineTimers;
 
 UniValue RPCServer::ExecuteCommand(Config &config,
                                    const JSONRPCRequest &request) const {
     // Return immediately if in warmup
     // This is retained from the old RPC implementation because a lot of state
     // is set during warmup that RPC commands may depend on.  This can be
     // safely removed once global variable usage has been eliminated.
     {
         LOCK(cs_rpcWarmup);
         if (fRPCInWarmup) {
             throw JSONRPCError(RPC_IN_WARMUP, rpcWarmupStatus);
         }
     }
 
     std::string commandName = request.strMethod;
     {
         auto commandsReadView = commands.getReadView();
         auto iter = commandsReadView->find(commandName);
         if (iter != commandsReadView.end()) {
             return iter->second.get()->Execute(request);
         }
     }
 
     // TODO Remove the below call to tableRPC.execute() and only call it for
     // context-free RPC commands via an implementation of RPCCommand.
 
     // Check if context-free RPC method is valid and execute it
     return tableRPC.execute(config, request);
 }
 
 void RPCServer::RegisterCommand(std::unique_ptr<RPCCommand> command) {
     if (command != nullptr) {
         const std::string &commandName = command->GetName();
         commands.getWriteView()->insert(
             std::make_pair(commandName, std::move(command)));
     }
 }
 
 static struct CRPCSignals {
     boost::signals2::signal<void()> Started;
     boost::signals2::signal<void()> Stopped;
     boost::signals2::signal<void(const ContextFreeRPCCommand &)> PreCommand;
 } g_rpcSignals;
 
 void RPCServerSignals::OnStarted(std::function<void()> slot) {
     g_rpcSignals.Started.connect(slot);
 }
 
 void RPCServerSignals::OnStopped(std::function<void()> slot) {
     g_rpcSignals.Stopped.connect(slot);
 }
 
 void RPCTypeCheck(const UniValue &params,
                   const std::list<UniValueType> &typesExpected,
                   bool fAllowNull) {
     unsigned int i = 0;
     for (const UniValueType &t : typesExpected) {
         if (params.size() <= i) {
             break;
         }
 
         const UniValue &v = params[i];
         if (!(fAllowNull && v.isNull())) {
             RPCTypeCheckArgument(v, t);
         }
         i++;
     }
 }
 
 void RPCTypeCheckArgument(const UniValue &value,
                           const UniValueType &typeExpected) {
     if (!typeExpected.typeAny && value.type() != typeExpected.type) {
         throw JSONRPCError(RPC_TYPE_ERROR,
                            strprintf("Expected type %s, got %s",
                                      uvTypeName(typeExpected.type),
                                      uvTypeName(value.type())));
     }
 }
 
 void RPCTypeCheckObj(const UniValue &o,
                      const std::map<std::string, UniValueType> &typesExpected,
                      bool fAllowNull, bool fStrict) {
     for (const auto &t : typesExpected) {
         const UniValue &v = find_value(o, t.first);
         if (!fAllowNull && v.isNull()) {
             throw JSONRPCError(RPC_TYPE_ERROR,
                                strprintf("Missing %s", t.first));
         }
 
         if (!(t.second.typeAny || v.type() == t.second.type ||
               (fAllowNull && v.isNull()))) {
             std::string err = strprintf("Expected type %s for %s, got %s",
                                         uvTypeName(t.second.type), t.first,
                                         uvTypeName(v.type()));
             throw JSONRPCError(RPC_TYPE_ERROR, err);
         }
     }
 
     if (fStrict) {
         for (const std::string &k : o.getKeys()) {
             if (typesExpected.count(k) == 0) {
                 std::string err = strprintf("Unexpected key %s", k);
                 throw JSONRPCError(RPC_TYPE_ERROR, err);
             }
         }
     }
 }
 
 Amount AmountFromValue(const UniValue &value) {
     if (!value.isNum() && !value.isStr()) {
         throw JSONRPCError(RPC_TYPE_ERROR, "Amount is not a number or string");
     }
 
     int64_t n;
     if (!ParseFixedPoint(value.getValStr(), 8, &n)) {
         throw JSONRPCError(RPC_TYPE_ERROR, "Invalid amount");
     }
 
     Amount amt = n * SATOSHI;
     if (!MoneyRange(amt)) {
         throw JSONRPCError(RPC_TYPE_ERROR, "Amount out of range");
     }
 
     return amt;
 }
 
 uint256 ParseHashV(const UniValue &v, std::string strName) {
     std::string strHex;
     if (v.isStr()) {
         strHex = v.get_str();
     }
 
     // Note: IsHex("") is false
     if (!IsHex(strHex)) {
         throw JSONRPCError(RPC_INVALID_PARAMETER,
                            strName + " must be hexadecimal string (not '" +
                                strHex + "')");
     }
 
     if (strHex.length() != 64) {
         throw JSONRPCError(RPC_INVALID_PARAMETER,
                            strprintf("%s must be of length %d (not %d)",
                                      strName, 64, strHex.length()));
     }
 
     uint256 result;
     result.SetHex(strHex);
     return result;
 }
 uint256 ParseHashO(const UniValue &o, std::string strKey) {
     return ParseHashV(find_value(o, strKey), strKey);
 }
 std::vector<uint8_t> ParseHexV(const UniValue &v, std::string strName) {
     std::string strHex;
     if (v.isStr()) {
         strHex = v.get_str();
     }
     if (!IsHex(strHex)) {
         throw JSONRPCError(RPC_INVALID_PARAMETER,
                            strName + " must be hexadecimal string (not '" +
                                strHex + "')");
     }
 
     return ParseHex(strHex);
 }
 std::vector<uint8_t> ParseHexO(const UniValue &o, std::string strKey) {
     return ParseHexV(find_value(o, strKey), strKey);
 }
 
 /**
  * Note: This interface may still be subject to change.
  */
 std::string CRPCTable::help(Config &config, const std::string &strCommand,
                             const JSONRPCRequest &helpreq) const {
     std::string strRet;
     std::string category;
     std::set<const ContextFreeRPCCommand *> setDone;
     std::vector<std::pair<std::string, const ContextFreeRPCCommand *>>
         vCommands;
 
     for (const auto &entry : mapCommands) {
         vCommands.push_back(
             std::make_pair(entry.second->category + entry.first, entry.second));
     }
     sort(vCommands.begin(), vCommands.end());
 
     JSONRPCRequest jreq(helpreq);
     jreq.fHelp = true;
     jreq.params = UniValue();
 
     for (const std::pair<std::string, const ContextFreeRPCCommand *> &command :
          vCommands) {
         const ContextFreeRPCCommand *pcmd = command.second;
         std::string strMethod = pcmd->name;
         // We already filter duplicates, but these deprecated screw up the sort
         // order
         if (strMethod.find("label") != std::string::npos) {
             continue;
         }
         if ((strCommand != "" || pcmd->category == "hidden") &&
             strMethod != strCommand) {
             continue;
         }
 
         jreq.strMethod = strMethod;
         try {
             if (setDone.insert(pcmd).second) {
                 pcmd->call(config, jreq);
             }
         } catch (const std::exception &e) {
             // Help text is returned in an exception
             std::string strHelp = std::string(e.what());
             if (strCommand == "") {
                 if (strHelp.find('\n') != std::string::npos) {
                     strHelp = strHelp.substr(0, strHelp.find('\n'));
                 }
 
                 if (category != pcmd->category) {
                     if (!category.empty()) {
                         strRet += "\n";
                     }
                     category = pcmd->category;
                     strRet += "== " + Capitalize(category) + " ==\n";
                 }
             }
             strRet += strHelp + "\n";
         }
     }
     if (strRet == "") {
         strRet = strprintf("help: unknown command: %s\n", strCommand);
     }
 
     strRet = strRet.substr(0, strRet.size() - 1);
     return strRet;
 }
 
 static UniValue help(Config &config, const JSONRPCRequest &jsonRequest) {
     if (jsonRequest.fHelp || jsonRequest.params.size() > 1) {
         throw std::runtime_error(
             "help ( \"command\" )\n"
             "\nList all commands, or get help for a specified command.\n"
             "\nArguments:\n"
             "1. \"command\"     (string, optional) The command to get help on\n"
             "\nResult:\n"
             "\"text\"     (string) The help text\n");
     }
 
     std::string strCommand;
     if (jsonRequest.params.size() > 0) {
         strCommand = jsonRequest.params[0].get_str();
     }
 
     return tableRPC.help(config, strCommand, jsonRequest);
 }
 
 static UniValue stop(const Config &config, const JSONRPCRequest &jsonRequest) {
     // Accept the deprecated and ignored 'detach' boolean argument
     if (jsonRequest.fHelp || jsonRequest.params.size() > 1) {
         throw std::runtime_error("stop\n"
                                  "\nStop Bitcoin server.");
     }
 
     // Event loop will exit after current HTTP requests have been handled, so
     // this reply will get back to the client.
     StartShutdown();
     return "Bitcoin server stopping";
 }
 
 static UniValue uptime(const Config &config,
                        const JSONRPCRequest &jsonRequest) {
     if (jsonRequest.fHelp || jsonRequest.params.size() > 1) {
         throw std::runtime_error("uptime\n"
                                  "\nReturns the total uptime of the server.\n"
                                  "\nResult:\n"
                                  "ttt        (numeric) The number of seconds "
                                  "that the server has been running\n"
                                  "\nExamples:\n" +
                                  HelpExampleCli("uptime", "") +
                                  HelpExampleRpc("uptime", ""));
     }
 
     return GetTime() - GetStartupTime();
 }
 
 /**
  * Call Table
  */
 // clang-format off
 static const ContextFreeRPCCommand vRPCCommands[] = {
     //  category            name                      actor (function)        argNames
     //  ------------------- ------------------------  ----------------------  ----------
     /* Overall control/query calls */
     { "control",            "help",                   help,                   {"command"}  },
     { "control",            "stop",                   stop,                   {}  },
     { "control",            "uptime",                 uptime,                 {}  },
 };
 // clang-format on
 
 CRPCTable::CRPCTable() {
     unsigned int vcidx;
     for (vcidx = 0; vcidx < (sizeof(vRPCCommands) / sizeof(vRPCCommands[0]));
          vcidx++) {
         const ContextFreeRPCCommand *pcmd;
 
         pcmd = &vRPCCommands[vcidx];
         mapCommands[pcmd->name] = pcmd;
     }
 }
 
 const ContextFreeRPCCommand *CRPCTable::
 operator[](const std::string &name) const {
     std::map<std::string, const ContextFreeRPCCommand *>::const_iterator it =
         mapCommands.find(name);
     if (it == mapCommands.end()) {
         return nullptr;
     }
 
     return (*it).second;
 }
 
 bool CRPCTable::appendCommand(const std::string &name,
                               const ContextFreeRPCCommand *pcmd) {
     if (IsRPCRunning()) {
         return false;
     }
 
     // don't allow overwriting for now
     std::map<std::string, const ContextFreeRPCCommand *>::const_iterator it =
         mapCommands.find(name);
     if (it != mapCommands.end()) {
         return false;
     }
 
     mapCommands[name] = pcmd;
     return true;
 }
 
 bool StartRPC() {
     LogPrint(BCLog::RPC, "Starting RPC\n");
     fRPCRunning = true;
     g_rpcSignals.Started();
     return true;
 }
 
 void InterruptRPC() {
     LogPrint(BCLog::RPC, "Interrupting RPC\n");
     // Interrupt e.g. running longpolls
     fRPCRunning = false;
 }
 
 void StopRPC() {
     LogPrint(BCLog::RPC, "Stopping RPC\n");
     deadlineTimers.clear();
     DeleteAuthCookie();
     g_rpcSignals.Stopped();
 }
 
 bool IsRPCRunning() {
     return fRPCRunning;
 }
 
 void SetRPCWarmupStatus(const std::string &newStatus) {
     LOCK(cs_rpcWarmup);
     rpcWarmupStatus = newStatus;
 }
 
 void SetRPCWarmupFinished() {
     LOCK(cs_rpcWarmup);
     assert(fRPCInWarmup);
     fRPCInWarmup = false;
 }
 
 bool RPCIsInWarmup(std::string *outStatus) {
     LOCK(cs_rpcWarmup);
     if (outStatus) {
         *outStatus = rpcWarmupStatus;
     }
     return fRPCInWarmup;
 }
 
 bool IsDeprecatedRPCEnabled(ArgsManager &args, const std::string &method) {
     const std::vector<std::string> enabled_methods =
         args.GetArgs("-deprecatedrpc");
 
     return find(enabled_methods.begin(), enabled_methods.end(), method) !=
            enabled_methods.end();
 }
 
 static UniValue JSONRPCExecOne(Config &config, RPCServer &rpcServer,
                                JSONRPCRequest jreq, const UniValue &req) {
     UniValue rpc_result(UniValue::VOBJ);
 
     try {
         jreq.parse(req);
 
         UniValue result = rpcServer.ExecuteCommand(config, jreq);
         rpc_result = JSONRPCReplyObj(result, NullUniValue, jreq.id);
     } catch (const UniValue &objError) {
         rpc_result = JSONRPCReplyObj(NullUniValue, objError, jreq.id);
     } catch (const std::exception &e) {
         rpc_result = JSONRPCReplyObj(
             NullUniValue, JSONRPCError(RPC_PARSE_ERROR, e.what()), jreq.id);
     }
 
     return rpc_result;
 }
 
 std::string JSONRPCExecBatch(Config &config, RPCServer &rpcServer,
                              const JSONRPCRequest &jreq, const UniValue &vReq) {
     UniValue ret(UniValue::VARR);
     for (size_t i = 0; i < vReq.size(); i++) {
         ret.push_back(JSONRPCExecOne(config, rpcServer, jreq, vReq[i]));
     }
 
     return ret.write() + "\n";
 }
 
 /**
  * Process named arguments into a vector of positional arguments, based on the
  * passed-in specification for the RPC call's arguments.
  */
 static inline JSONRPCRequest
 transformNamedArguments(const JSONRPCRequest &in,
                         const std::vector<std::string> &argNames) {
     JSONRPCRequest out = in;
     out.params = UniValue(UniValue::VARR);
     // Build a map of parameters, and remove ones that have been processed, so
     // that we can throw a focused error if there is an unknown one.
     const std::vector<std::string> &keys = in.params.getKeys();
     const std::vector<UniValue> &values = in.params.getValues();
     std::unordered_map<std::string, const UniValue *> argsIn;
     for (size_t i = 0; i < keys.size(); ++i) {
         argsIn[keys[i]] = &values[i];
     }
     // Process expected parameters.
     int hole = 0;
     for (const std::string &argNamePattern : argNames) {
         std::vector<std::string> vargNames;
         boost::algorithm::split(vargNames, argNamePattern,
                                 boost::algorithm::is_any_of("|"));
         auto fr = argsIn.end();
         for (const std::string &argName : vargNames) {
             fr = argsIn.find(argName);
             if (fr != argsIn.end()) {
                 break;
             }
         }
         if (fr != argsIn.end()) {
             for (int i = 0; i < hole; ++i) {
                 // Fill hole between specified parameters with JSON nulls, but
                 // not at the end (for backwards compatibility with calls that
                 // act based on number of specified parameters).
                 out.params.push_back(UniValue());
             }
             hole = 0;
             out.params.push_back(*fr->second);
             argsIn.erase(fr);
         } else {
             hole += 1;
         }
     }
     // If there are still arguments in the argsIn map, this is an error.
     if (!argsIn.empty()) {
         throw JSONRPCError(RPC_INVALID_PARAMETER,
                            "Unknown named parameter " + argsIn.begin()->first);
     }
     // Return request with named arguments transformed to positional arguments
     return out;
 }
 
 UniValue CRPCTable::execute(Config &config,
                             const JSONRPCRequest &request) const {
     // Return immediately if in warmup
     {
         LOCK(cs_rpcWarmup);
         if (fRPCInWarmup) {
             throw JSONRPCError(RPC_IN_WARMUP, rpcWarmupStatus);
         }
     }
 
     // Check if legacy RPC method is valid.
     // See RPCServer::ExecuteCommand for context-sensitive RPC commands.
     const ContextFreeRPCCommand *pcmd = tableRPC[request.strMethod];
     if (!pcmd) {
         throw JSONRPCError(RPC_METHOD_NOT_FOUND, "Method not found");
     }
 
     g_rpcSignals.PreCommand(*pcmd);
 
     try {
         // Execute, convert arguments to array if necessary
         if (request.params.isObject()) {
             return pcmd->call(config,
                               transformNamedArguments(request, pcmd->argNames));
         } else {
             return pcmd->call(config, request);
         }
     } catch (const std::exception &e) {
         throw JSONRPCError(RPC_MISC_ERROR, e.what());
     }
 }
 
 std::vector<std::string> CRPCTable::listCommands() const {
     std::vector<std::string> commandList;
     for (const auto &i : mapCommands) {
         commandList.emplace_back(i.first);
     }
     return commandList;
 }
 
 std::string HelpExampleCli(const std::string &methodname,
                            const std::string &args) {
     return "> bitcoin-cli " + methodname + " " + args + "\n";
 }
 
 std::string HelpExampleRpc(const std::string &methodname,
                            const std::string &args) {
     return "> curl --user myusername --data-binary '{\"jsonrpc\": \"1.0\", "
            "\"id\":\"curltest\", "
            "\"method\": \"" +
            methodname + "\", \"params\": [" + args +
            "] }' -H 'content-type: text/plain;' http://127.0.0.1:8332/\n";
 }
 
 void RPCSetTimerInterfaceIfUnset(RPCTimerInterface *iface) {
     if (!timerInterface) {
         timerInterface = iface;
     }
 }
 
 void RPCSetTimerInterface(RPCTimerInterface *iface) {
     timerInterface = iface;
 }
 
 void RPCUnsetTimerInterface(RPCTimerInterface *iface) {
     if (timerInterface == iface) {
         timerInterface = nullptr;
     }
 }
 
 void RPCRunLater(const std::string &name, std::function<void()> func,
                  int64_t nSeconds) {
     if (!timerInterface) {
         throw JSONRPCError(RPC_INTERNAL_ERROR,
                            "No timer handler registered for RPC");
     }
     deadlineTimers.erase(name);
     LogPrint(BCLog::RPC, "queue run of timer %s in %i seconds (using %s)\n",
              name, nSeconds, timerInterface->Name());
     deadlineTimers.emplace(
         name, std::unique_ptr<RPCTimerBase>(
                   timerInterface->NewTimer(func, nSeconds * 1000)));
 }
 
 int RPCSerializationFlags() {
     return 0;
 }
 
 CRPCTable tableRPC;
diff --git a/src/test/scheduler_tests.cpp b/src/test/scheduler_tests.cpp
index eab9204d3..4ef230486 100644
--- a/src/test/scheduler_tests.cpp
+++ b/src/test/scheduler_tests.cpp
@@ -1,231 +1,229 @@
 // Copyright (c) 2012-2016 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <scheduler.h>
 
 #include <random.h>
 
 #include <test/test_bitcoin.h>
 
-#include <boost/bind.hpp>
 #include <boost/test/unit_test.hpp>
 
 #include <atomic>
 #include <thread>
 
 BOOST_AUTO_TEST_SUITE(scheduler_tests)
 
 static void microTask(CScheduler &s, boost::mutex &mutex, int &counter,
                       int delta,
                       boost::chrono::system_clock::time_point rescheduleTime) {
     {
         boost::unique_lock<boost::mutex> lock(mutex);
         counter += delta;
     }
     boost::chrono::system_clock::time_point noTime =
         boost::chrono::system_clock::time_point::min();
     if (rescheduleTime != noTime) {
         CScheduler::Function f =
-            boost::bind(&microTask, std::ref(s), std::ref(mutex),
-                        std::ref(counter), -delta + 1, noTime);
+            std::bind(&microTask, std::ref(s), std::ref(mutex),
+                      std::ref(counter), -delta + 1, noTime);
         s.schedule(f, rescheduleTime);
     }
 }
 
 static void MicroSleep(uint64_t n) {
     boost::this_thread::sleep_for(boost::chrono::microseconds(n));
 }
 
 BOOST_AUTO_TEST_CASE(manythreads) {
     // Stress test: hundreds of microsecond-scheduled tasks,
     // serviced by 10 threads.
     //
     // So... ten shared counters, which if all the tasks execute
     // properly will sum to the number of tasks done.
     // Each task adds or subtracts a random amount from one of the
     // counters, and then schedules another task 0-1000
     // microseconds in the future to subtract or add from
     // the counter -random_amount+1, so in the end the shared
     // counters should sum to the number of initial tasks performed.
     CScheduler microTasks;
 
     boost::mutex counterMutex[10];
     int counter[10] = {0};
     FastRandomContext rng{/* fDeterministic */ true};
     // [0, 9]
     auto zeroToNine = [](FastRandomContext &rc) -> int {
         return rc.randrange(10);
     };
     // [-11, 1000]
     auto randomMsec = [](FastRandomContext &rc) -> int {
         return -11 + int(rc.randrange(1012));
     };
     // [-1000, 1000]
     auto randomDelta = [](FastRandomContext &rc) -> int {
         return -1000 + int(rc.randrange(2001));
     };
 
     boost::chrono::system_clock::time_point start =
         boost::chrono::system_clock::now();
     boost::chrono::system_clock::time_point now = start;
     boost::chrono::system_clock::time_point first, last;
     size_t nTasks = microTasks.getQueueInfo(first, last);
     BOOST_CHECK(nTasks == 0);
 
     for (int i = 0; i < 100; ++i) {
         boost::chrono::system_clock::time_point t =
             now + boost::chrono::microseconds(randomMsec(rng));
         boost::chrono::system_clock::time_point tReschedule =
             now + boost::chrono::microseconds(500 + randomMsec(rng));
         int whichCounter = zeroToNine(rng);
-        CScheduler::Function f = boost::bind(
-            &microTask, std::ref(microTasks),
-            std::ref(counterMutex[whichCounter]),
-            std::ref(counter[whichCounter]), randomDelta(rng), tReschedule);
+        CScheduler::Function f = std::bind(&microTask, std::ref(microTasks),
+                                           std::ref(counterMutex[whichCounter]),
+                                           std::ref(counter[whichCounter]),
+                                           randomDelta(rng), tReschedule);
         microTasks.schedule(f, t);
     }
     nTasks = microTasks.getQueueInfo(first, last);
     BOOST_CHECK(nTasks == 100);
     BOOST_CHECK(first < last);
     BOOST_CHECK(last > now);
 
     // As soon as these are created they will start running and servicing the
     // queue
     boost::thread_group microThreads;
     for (int i = 0; i < 5; i++) {
         microThreads.create_thread(
-            boost::bind(&CScheduler::serviceQueue, &microTasks));
+            std::bind(&CScheduler::serviceQueue, &microTasks));
     }
 
     MicroSleep(600);
     now = boost::chrono::system_clock::now();
 
     // More threads and more tasks:
     for (int i = 0; i < 5; i++) {
         microThreads.create_thread(
-            boost::bind(&CScheduler::serviceQueue, &microTasks));
+            std::bind(&CScheduler::serviceQueue, &microTasks));
     }
 
     for (int i = 0; i < 100; i++) {
         boost::chrono::system_clock::time_point t =
             now + boost::chrono::microseconds(randomMsec(rng));
         boost::chrono::system_clock::time_point tReschedule =
             now + boost::chrono::microseconds(500 + randomMsec(rng));
         int whichCounter = zeroToNine(rng);
-        CScheduler::Function f = boost::bind(
-            &microTask, std::ref(microTasks),
-            std::ref(counterMutex[whichCounter]),
-            std::ref(counter[whichCounter]), randomDelta(rng), tReschedule);
+        CScheduler::Function f = std::bind(&microTask, std::ref(microTasks),
+                                           std::ref(counterMutex[whichCounter]),
+                                           std::ref(counter[whichCounter]),
+                                           randomDelta(rng), tReschedule);
         microTasks.schedule(f, t);
     }
 
     // Drain the task queue then exit threads
     microTasks.stop(true);
     // ... wait until all the threads are done
     microThreads.join_all();
 
     int counterSum = 0;
     for (int i = 0; i < 10; i++) {
         BOOST_CHECK(counter[i] != 0);
         counterSum += counter[i];
     }
     BOOST_CHECK_EQUAL(counterSum, 200);
 }
 
 BOOST_AUTO_TEST_CASE(schedule_every) {
     CScheduler scheduler;
 
     boost::condition_variable cvar;
     std::atomic<int> counter{15};
     std::atomic<bool> keepRunning{true};
 
     scheduler.scheduleEvery(
         [&keepRunning, &cvar, &counter, &scheduler]() {
             assert(counter > 0);
             cvar.notify_all();
             if (--counter > 0) {
                 return true;
             }
 
             // We reached the end of our test, make sure nothing run again for
             // 100ms.
             scheduler.scheduleFromNow(
                 [&keepRunning, &cvar]() {
                     keepRunning = false;
                     cvar.notify_all();
                 },
                 100);
 
             // We set the counter to some magic value to check the scheduler
             // empty its queue properly after 120ms.
             scheduler.scheduleFromNow([&counter]() { counter = 42; }, 120);
             return false;
         },
         5);
 
     // Start the scheduler thread.
     std::thread schedulerThread(
         std::bind(&CScheduler::serviceQueue, &scheduler));
 
     boost::mutex mutex;
     boost::unique_lock<boost::mutex> lock(mutex);
     while (keepRunning) {
         cvar.wait(lock);
         BOOST_CHECK(counter >= 0);
     }
 
     BOOST_CHECK_EQUAL(counter, 0);
     scheduler.stop(true);
     schedulerThread.join();
     BOOST_CHECK_EQUAL(counter, 42);
 }
 
 BOOST_AUTO_TEST_CASE(singlethreadedscheduler_ordered) {
     CScheduler scheduler;
 
     // each queue should be well ordered with respect to itself but not other
     // queues
     SingleThreadedSchedulerClient queue1(&scheduler);
     SingleThreadedSchedulerClient queue2(&scheduler);
 
     // create more threads than queues
     // if the queues only permit execution of one task at once then
     // the extra threads should effectively be doing nothing
     // if they don't we'll get out of order behaviour
     boost::thread_group threads;
     for (int i = 0; i < 5; ++i) {
-        threads.create_thread(
-            boost::bind(&CScheduler::serviceQueue, &scheduler));
+        threads.create_thread(std::bind(&CScheduler::serviceQueue, &scheduler));
     }
 
     // these are not atomic, if SinglethreadedSchedulerClient prevents
     // parallel execution at the queue level no synchronization should be
     // required here
     int counter1 = 0;
     int counter2 = 0;
 
     // just simply count up on each queue - if execution is properly ordered
     // then the callbacks should run in exactly the order in which they were
     // enqueued
     for (int i = 0; i < 100; ++i) {
         queue1.AddToProcessQueue([i, &counter1]() {
             bool expectation = i == counter1++;
             assert(expectation);
         });
 
         queue2.AddToProcessQueue([i, &counter2]() {
             bool expectation = i == counter2++;
             assert(expectation);
         });
     }
 
     // finish up
     scheduler.stop(true);
     threads.join_all();
 
     BOOST_CHECK_EQUAL(counter1, 100);
     BOOST_CHECK_EQUAL(counter2, 100);
 }
 
 BOOST_AUTO_TEST_SUITE_END()
diff --git a/src/test/test_bitcoin.cpp b/src/test/test_bitcoin.cpp
index 5a03b7896..e6089a261 100644
--- a/src/test/test_bitcoin.cpp
+++ b/src/test/test_bitcoin.cpp
@@ -1,214 +1,213 @@
 // Copyright (c) 2011-2016 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <test/test_bitcoin.h>
 
 #include <banman.h>
 #include <chain.h>
 #include <chainparams.h>
 #include <config.h>
 #include <consensus/consensus.h>
 #include <consensus/validation.h>
 #include <crypto/sha256.h>
 #include <fs.h>
 #include <key.h>
 #include <logging.h>
 #include <miner.h>
 #include <net_processing.h>
 #include <noui.h>
 #include <pow.h>
 #include <pubkey.h>
 #include <random.h>
 #include <rpc/register.h>
 #include <rpc/server.h>
 #include <script/scriptcache.h>
 #include <script/sigcache.h>
 #include <txdb.h>
 #include <txmempool.h>
 #include <ui_interface.h>
 #include <validation.h>
 
 #include <memory>
 
 FastRandomContext g_insecure_rand_ctx;
 
 std::ostream &operator<<(std::ostream &os, const uint256 &num) {
     os << num.ToString();
     return os;
 }
 
 BasicTestingSetup::BasicTestingSetup(const std::string &chainName)
     : m_path_root(fs::temp_directory_path() / "test_bitcoin" /
                   strprintf("%lu_%i", static_cast<unsigned long>(GetTime()),
                             int(InsecureRandRange(1 << 30)))) {
     SHA256AutoDetect();
     RandomInit();
     ECC_Start();
     SetupEnvironment();
     SetupNetworking();
     InitSignatureCache();
     InitScriptExecutionCache();
 
     // Don't want to write to debug.log file.
     GetLogger().m_print_to_file = false;
 
     fCheckBlockIndex = true;
     SelectParams(chainName);
     noui_connect();
 }
 
 BasicTestingSetup::~BasicTestingSetup() {
     fs::remove_all(m_path_root);
     ECC_Stop();
 }
 
 fs::path BasicTestingSetup::SetDataDir(const std::string &name) {
     fs::path ret = m_path_root / name;
     fs::create_directories(ret);
     gArgs.ForceSetArg("-datadir", ret.string());
     return ret;
 }
 
 TestingSetup::TestingSetup(const std::string &chainName)
     : BasicTestingSetup(chainName) {
     SetDataDir("tempdir");
     const Config &config = GetConfig();
     const CChainParams &chainparams = config.GetChainParams();
 
     // Ideally we'd move all the RPC tests to the functional testing framework
     // instead of unit tests, but for now we need these here.
     RPCServer rpcServer;
     RegisterAllRPCCommands(config, rpcServer, tableRPC);
 
     /**
      * RPC does not come out of the warmup state on its own. Normally, this is
      * handled in bitcoind's init path, but unit tests do not trigger this
      * codepath, so we call it explicitly as part of setup.
      */
     std::string rpcWarmupStatus;
     if (RPCIsInWarmup(&rpcWarmupStatus)) {
         SetRPCWarmupFinished();
     }
 
     ClearDatadirCache();
 
     // We have to run a scheduler thread to prevent ActivateBestChain
     // from blocking due to queue overrun.
-    threadGroup.create_thread(
-        boost::bind(&CScheduler::serviceQueue, &scheduler));
+    threadGroup.create_thread(std::bind(&CScheduler::serviceQueue, &scheduler));
     GetMainSignals().RegisterBackgroundSignalScheduler(scheduler);
 
     g_mempool.setSanityCheck(1.0);
     pblocktree.reset(new CBlockTreeDB(1 << 20, true));
     pcoinsdbview.reset(new CCoinsViewDB(1 << 23, true));
     pcoinsTip.reset(new CCoinsViewCache(pcoinsdbview.get()));
     if (!LoadGenesisBlock(chainparams)) {
         throw std::runtime_error("LoadGenesisBlock failed.");
     }
     {
         CValidationState state;
         if (!ActivateBestChain(config, state)) {
             throw std::runtime_error(strprintf("ActivateBestChain failed. (%s)",
                                                FormatStateMessage(state)));
         }
     }
     nScriptCheckThreads = 3;
     for (int i = 0; i < nScriptCheckThreads - 1; i++) {
         threadGroup.create_thread(&ThreadScriptCheck);
     }
 
     g_banman =
         std::make_unique<BanMan>(GetDataDir() / "banlist.dat", chainparams,
                                  nullptr, DEFAULT_MISBEHAVING_BANTIME);
     // Deterministic randomness for tests.
     g_connman = std::make_unique<CConnman>(config, 0x1337, 0x1337);
 }
 
 TestingSetup::~TestingSetup() {
     threadGroup.interrupt_all();
     threadGroup.join_all();
     GetMainSignals().FlushBackgroundCallbacks();
     GetMainSignals().UnregisterBackgroundSignalScheduler();
     g_connman.reset();
     g_banman.reset();
     UnloadBlockIndex();
     pcoinsTip.reset();
     pcoinsdbview.reset();
     pblocktree.reset();
 }
 
 TestChain100Setup::TestChain100Setup()
     : TestingSetup(CBaseChainParams::REGTEST) {
     // Generate a 100-block chain:
     coinbaseKey.MakeNewKey(true);
     CScript scriptPubKey = CScript() << ToByteVector(coinbaseKey.GetPubKey())
                                      << OP_CHECKSIG;
     for (int i = 0; i < COINBASE_MATURITY; i++) {
         std::vector<CMutableTransaction> noTxns;
         CBlock b = CreateAndProcessBlock(noTxns, scriptPubKey);
         m_coinbase_txns.push_back(b.vtx[0]);
     }
 }
 
 //
 // Create a new block with just given transactions, coinbase paying to
 // scriptPubKey, and try to add it to the current chain.
 //
 CBlock TestChain100Setup::CreateAndProcessBlock(
     const std::vector<CMutableTransaction> &txns, const CScript &scriptPubKey) {
     const Config &config = GetConfig();
     std::unique_ptr<CBlockTemplate> pblocktemplate =
         BlockAssembler(config, g_mempool).CreateNewBlock(scriptPubKey);
     CBlock &block = pblocktemplate->block;
 
     // Replace mempool-selected txns with just coinbase plus passed-in txns:
     block.vtx.resize(1);
     for (const CMutableTransaction &tx : txns) {
         block.vtx.push_back(MakeTransactionRef(tx));
     }
 
     // Order transactions by canonical order
     std::sort(std::begin(block.vtx) + 1, std::end(block.vtx),
               [](const std::shared_ptr<const CTransaction> &txa,
                  const std::shared_ptr<const CTransaction> &txb) -> bool {
                   return txa->GetId() < txb->GetId();
               });
 
     // IncrementExtraNonce creates a valid coinbase and merkleRoot
     {
         LOCK(cs_main);
         unsigned int extraNonce = 0;
         IncrementExtraNonce(config, &block, chainActive.Tip(), extraNonce);
     }
 
     const Consensus::Params &params = config.GetChainParams().GetConsensus();
     while (!CheckProofOfWork(block.GetHash(), block.nBits, params)) {
         ++block.nNonce;
     }
 
     std::shared_ptr<const CBlock> shared_pblock =
         std::make_shared<const CBlock>(block);
     ProcessNewBlock(config, shared_pblock, true, nullptr);
 
     CBlock result = block;
     return result;
 }
 
 TestChain100Setup::~TestChain100Setup() {}
 
 CTxMemPoolEntry TestMemPoolEntryHelper::FromTx(const CMutableTransaction &tx,
                                                CTxMemPool *pool) {
     return FromTx(MakeTransactionRef(tx), pool);
 }
 
 CTxMemPoolEntry TestMemPoolEntryHelper::FromTx(const CTransactionRef &tx,
                                                CTxMemPool *pool) {
     // Hack to assume either it's completely dependent on other mempool txs or
     // not at all.
     Amount inChainValue =
         pool && pool->HasNoInputsOf(*tx) ? tx->GetValueOut() : Amount::zero();
 
     return CTxMemPoolEntry(tx, nFee, nTime, dPriority, nHeight, inChainValue,
                            spendsCoinbase, sigOpCost, lp);
 }
diff --git a/src/test/transaction_tests.cpp b/src/test/transaction_tests.cpp
index f5796cf3e..ddd3be01f 100644
--- a/src/test/transaction_tests.cpp
+++ b/src/test/transaction_tests.cpp
@@ -1,805 +1,805 @@
 // Copyright (c) 2011-2016 The Bitcoin Core developers
 // Copyright (c) 2017-2018 The Bitcoin developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <chainparams.h> // For CChainParams
 #include <checkqueue.h>
 #include <clientversion.h>
 #include <config.h>
 #include <consensus/tx_verify.h>
 #include <consensus/validation.h>
 #include <core_io.h>
 #include <key.h>
 #include <keystore.h>
 #include <policy/policy.h>
 #include <script/script.h>
 #include <script/script_error.h>
 #include <script/sign.h>
 #include <script/standard.h>
 #include <streams.h>
 #include <util/strencodings.h>
 #include <util/system.h>
 #include <validation.h>
 
 #include <test/data/tx_invalid.json.h>
 #include <test/data/tx_valid.json.h>
 #include <test/jsonutil.h>
 #include <test/scriptflags.h>
 #include <test/test_bitcoin.h>
 
 #include <boost/test/unit_test.hpp>
 
 #include <univalue.h>
 
 #include <map>
 #include <string>
 
 typedef std::vector<uint8_t> valtype;
 
 BOOST_FIXTURE_TEST_SUITE(transaction_tests, BasicTestingSetup)
 
 static COutPoint buildOutPoint(const UniValue &vinput) {
     TxId txid;
     txid.SetHex(vinput[0].get_str());
     return COutPoint(txid, vinput[1].get_int());
 }
 
 BOOST_AUTO_TEST_CASE(tx_valid) {
     // Read tests from test/data/tx_valid.json
     // Format is an array of arrays
     // Inner arrays are either [ "comment" ]
     // or [[[prevout hash, prevout index, prevout scriptPubKey], [input 2],
     // ...],"], serializedTransaction, verifyFlags
     // ... where all scripts are stringified scripts.
     //
     // verifyFlags is a comma separated list of script verification flags to
     // apply, or "NONE"
     UniValue tests = read_json(
         std::string(json_tests::tx_valid,
                     json_tests::tx_valid + sizeof(json_tests::tx_valid)));
 
     ScriptError err;
     for (size_t idx = 0; idx < tests.size(); idx++) {
         UniValue test = tests[idx];
         std::string strTest = test.write();
         if (test[0].isArray()) {
             if (test.size() != 3 || !test[1].isStr() || !test[2].isStr()) {
                 BOOST_ERROR("Bad test: " << strTest);
                 continue;
             }
 
             std::map<COutPoint, CScript> mapprevOutScriptPubKeys;
             std::map<COutPoint, Amount> mapprevOutValues;
             UniValue inputs = test[0].get_array();
             bool fValid = true;
             for (size_t inpIdx = 0; inpIdx < inputs.size(); inpIdx++) {
                 const UniValue &input = inputs[inpIdx];
                 if (!input.isArray()) {
                     fValid = false;
                     break;
                 }
                 UniValue vinput = input.get_array();
                 if (vinput.size() < 3 || vinput.size() > 4) {
                     fValid = false;
                     break;
                 }
                 COutPoint outpoint = buildOutPoint(vinput);
                 mapprevOutScriptPubKeys[outpoint] =
                     ParseScript(vinput[2].get_str());
                 if (vinput.size() >= 4) {
                     mapprevOutValues[outpoint] =
                         vinput[3].get_int64() * SATOSHI;
                 }
             }
             if (!fValid) {
                 BOOST_ERROR("Bad test: " << strTest);
                 continue;
             }
 
             std::string transaction = test[1].get_str();
             CDataStream stream(ParseHex(transaction), SER_NETWORK,
                                PROTOCOL_VERSION);
             CTransaction tx(deserialize, stream);
 
             CValidationState state;
             BOOST_CHECK_MESSAGE(tx.IsCoinBase()
                                     ? CheckCoinbase(tx, state)
                                     : CheckRegularTransaction(tx, state),
                                 strTest);
             BOOST_CHECK(state.IsValid());
 
             // Check that CheckCoinbase reject non-coinbase transactions and
             // vice versa.
             BOOST_CHECK_MESSAGE(!(tx.IsCoinBase()
                                       ? CheckRegularTransaction(tx, state)
                                       : CheckCoinbase(tx, state)),
                                 strTest);
             BOOST_CHECK(state.IsInvalid());
 
             PrecomputedTransactionData txdata(tx);
             for (size_t i = 0; i < tx.vin.size(); i++) {
                 if (!mapprevOutScriptPubKeys.count(tx.vin[i].prevout)) {
                     BOOST_ERROR("Bad test: " << strTest);
                     break;
                 }
 
                 Amount amount = Amount::zero();
                 if (mapprevOutValues.count(tx.vin[i].prevout)) {
                     amount = mapprevOutValues[tx.vin[i].prevout];
                 }
 
                 uint32_t verify_flags = ParseScriptFlags(test[2].get_str());
                 BOOST_CHECK_MESSAGE(
                     VerifyScript(
                         tx.vin[i].scriptSig,
                         mapprevOutScriptPubKeys[tx.vin[i].prevout],
                         verify_flags,
                         TransactionSignatureChecker(&tx, i, amount, txdata),
                         &err),
                     strTest);
                 BOOST_CHECK_MESSAGE(err == ScriptError::OK,
                                     ScriptErrorString(err));
             }
         }
     }
 }
 
 BOOST_AUTO_TEST_CASE(tx_invalid) {
     // Read tests from test/data/tx_invalid.json
     // Format is an array of arrays
     // Inner arrays are either [ "comment" ]
     // or [[[prevout hash, prevout index, prevout scriptPubKey], [input 2],
     // ...],"], serializedTransaction, verifyFlags
     // ... where all scripts are stringified scripts.
     //
     // verifyFlags is a comma separated list of script verification flags to
     // apply, or "NONE"
     UniValue tests = read_json(
         std::string(json_tests::tx_invalid,
                     json_tests::tx_invalid + sizeof(json_tests::tx_invalid)));
 
     // Initialize to ScriptError::OK. The tests expect err to be changed to a
     // value other than ScriptError::OK.
     ScriptError err = ScriptError::OK;
     for (size_t idx = 0; idx < tests.size(); idx++) {
         UniValue test = tests[idx];
         std::string strTest = test.write();
         if (test[0].isArray()) {
             if (test.size() != 3 || !test[1].isStr() || !test[2].isStr()) {
                 BOOST_ERROR("Bad test: " << strTest);
                 continue;
             }
 
             std::map<COutPoint, CScript> mapprevOutScriptPubKeys;
             std::map<COutPoint, Amount> mapprevOutValues;
             UniValue inputs = test[0].get_array();
             bool fValid = true;
             for (size_t inpIdx = 0; inpIdx < inputs.size(); inpIdx++) {
                 const UniValue &input = inputs[inpIdx];
                 if (!input.isArray()) {
                     fValid = false;
                     break;
                 }
                 UniValue vinput = input.get_array();
                 if (vinput.size() < 3 || vinput.size() > 4) {
                     fValid = false;
                     break;
                 }
                 COutPoint outpoint = buildOutPoint(vinput);
                 mapprevOutScriptPubKeys[outpoint] =
                     ParseScript(vinput[2].get_str());
                 if (vinput.size() >= 4) {
                     mapprevOutValues[outpoint] =
                         vinput[3].get_int64() * SATOSHI;
                 }
             }
             if (!fValid) {
                 BOOST_ERROR("Bad test: " << strTest);
                 continue;
             }
 
             std::string transaction = test[1].get_str();
             CDataStream stream(ParseHex(transaction), SER_NETWORK,
                                PROTOCOL_VERSION);
             CTransaction tx(deserialize, stream);
 
             CValidationState state;
             fValid = CheckRegularTransaction(tx, state) && state.IsValid();
 
             PrecomputedTransactionData txdata(tx);
             for (size_t i = 0; i < tx.vin.size() && fValid; i++) {
                 if (!mapprevOutScriptPubKeys.count(tx.vin[i].prevout)) {
                     BOOST_ERROR("Bad test: " << strTest);
                     break;
                 }
 
                 Amount amount = Amount::zero();
                 if (0 != mapprevOutValues.count(tx.vin[i].prevout)) {
                     amount = mapprevOutValues[tx.vin[i].prevout];
                 }
 
                 uint32_t verify_flags = ParseScriptFlags(test[2].get_str());
                 fValid = VerifyScript(
                     tx.vin[i].scriptSig,
                     mapprevOutScriptPubKeys[tx.vin[i].prevout], verify_flags,
                     TransactionSignatureChecker(&tx, i, amount, txdata), &err);
             }
             BOOST_CHECK_MESSAGE(!fValid, strTest);
             BOOST_CHECK_MESSAGE(err != ScriptError::OK, ScriptErrorString(err));
         }
     }
 }
 
 BOOST_AUTO_TEST_CASE(basic_transaction_tests) {
     // Random real transaction
     // (e2769b09e784f32f62ef849763d4f45b98e07ba658647343b915ff832b110436)
     uint8_t ch[] = {
         0x01, 0x00, 0x00, 0x00, 0x01, 0x6b, 0xff, 0x7f, 0xcd, 0x4f, 0x85, 0x65,
         0xef, 0x40, 0x6d, 0xd5, 0xd6, 0x3d, 0x4f, 0xf9, 0x4f, 0x31, 0x8f, 0xe8,
         0x20, 0x27, 0xfd, 0x4d, 0xc4, 0x51, 0xb0, 0x44, 0x74, 0x01, 0x9f, 0x74,
         0xb4, 0x00, 0x00, 0x00, 0x00, 0x8c, 0x49, 0x30, 0x46, 0x02, 0x21, 0x00,
         0xda, 0x0d, 0xc6, 0xae, 0xce, 0xfe, 0x1e, 0x06, 0xef, 0xdf, 0x05, 0x77,
         0x37, 0x57, 0xde, 0xb1, 0x68, 0x82, 0x09, 0x30, 0xe3, 0xb0, 0xd0, 0x3f,
         0x46, 0xf5, 0xfc, 0xf1, 0x50, 0xbf, 0x99, 0x0c, 0x02, 0x21, 0x00, 0xd2,
         0x5b, 0x5c, 0x87, 0x04, 0x00, 0x76, 0xe4, 0xf2, 0x53, 0xf8, 0x26, 0x2e,
         0x76, 0x3e, 0x2d, 0xd5, 0x1e, 0x7f, 0xf0, 0xbe, 0x15, 0x77, 0x27, 0xc4,
         0xbc, 0x42, 0x80, 0x7f, 0x17, 0xbd, 0x39, 0x01, 0x41, 0x04, 0xe6, 0xc2,
         0x6e, 0xf6, 0x7d, 0xc6, 0x10, 0xd2, 0xcd, 0x19, 0x24, 0x84, 0x78, 0x9a,
         0x6c, 0xf9, 0xae, 0xa9, 0x93, 0x0b, 0x94, 0x4b, 0x7e, 0x2d, 0xb5, 0x34,
         0x2b, 0x9d, 0x9e, 0x5b, 0x9f, 0xf7, 0x9a, 0xff, 0x9a, 0x2e, 0xe1, 0x97,
         0x8d, 0xd7, 0xfd, 0x01, 0xdf, 0xc5, 0x22, 0xee, 0x02, 0x28, 0x3d, 0x3b,
         0x06, 0xa9, 0xd0, 0x3a, 0xcf, 0x80, 0x96, 0x96, 0x8d, 0x7d, 0xbb, 0x0f,
         0x91, 0x78, 0xff, 0xff, 0xff, 0xff, 0x02, 0x8b, 0xa7, 0x94, 0x0e, 0x00,
         0x00, 0x00, 0x00, 0x19, 0x76, 0xa9, 0x14, 0xba, 0xde, 0xec, 0xfd, 0xef,
         0x05, 0x07, 0x24, 0x7f, 0xc8, 0xf7, 0x42, 0x41, 0xd7, 0x3b, 0xc0, 0x39,
         0x97, 0x2d, 0x7b, 0x88, 0xac, 0x40, 0x94, 0xa8, 0x02, 0x00, 0x00, 0x00,
         0x00, 0x19, 0x76, 0xa9, 0x14, 0xc1, 0x09, 0x32, 0x48, 0x3f, 0xec, 0x93,
         0xed, 0x51, 0xf5, 0xfe, 0x95, 0xe7, 0x25, 0x59, 0xf2, 0xcc, 0x70, 0x43,
         0xf9, 0x88, 0xac, 0x00, 0x00, 0x00, 0x00, 0x00};
     std::vector<uint8_t> vch(ch, ch + sizeof(ch) - 1);
     CDataStream stream(vch, SER_DISK, CLIENT_VERSION);
     CMutableTransaction tx;
     stream >> tx;
     CValidationState state;
     BOOST_CHECK_MESSAGE(CheckRegularTransaction(CTransaction(tx), state) &&
                             state.IsValid(),
                         "Simple deserialized transaction should be valid.");
 
     // Check that duplicate txins fail
     tx.vin.push_back(tx.vin[0]);
     BOOST_CHECK_MESSAGE(!CheckRegularTransaction(CTransaction(tx), state) ||
                             !state.IsValid(),
                         "Transaction with duplicate txins should be invalid.");
 }
 
 //
 // Helper: create two dummy transactions, each with
 // two outputs.  The first has 11 and 50 CENT outputs
 // paid to a TX_PUBKEY, the second 21 and 22 CENT outputs
 // paid to a TX_PUBKEYHASH.
 //
 static std::vector<CMutableTransaction>
 SetupDummyInputs(CBasicKeyStore &keystoreRet, CCoinsViewCache &coinsRet) {
     std::vector<CMutableTransaction> dummyTransactions;
     dummyTransactions.resize(2);
 
     // Add some keys to the keystore:
     CKey key[4];
     for (int i = 0; i < 4; i++) {
         key[i].MakeNewKey(i % 2);
         keystoreRet.AddKey(key[i]);
     }
 
     // Create some dummy input transactions
     dummyTransactions[0].vout.resize(2);
     dummyTransactions[0].vout[0].nValue = 11 * CENT;
     dummyTransactions[0].vout[0].scriptPubKey
         << ToByteVector(key[0].GetPubKey()) << OP_CHECKSIG;
     dummyTransactions[0].vout[1].nValue = 50 * CENT;
     dummyTransactions[0].vout[1].scriptPubKey
         << ToByteVector(key[1].GetPubKey()) << OP_CHECKSIG;
     AddCoins(coinsRet, CTransaction(dummyTransactions[0]), 0);
 
     dummyTransactions[1].vout.resize(2);
     dummyTransactions[1].vout[0].nValue = 21 * CENT;
     dummyTransactions[1].vout[0].scriptPubKey =
         GetScriptForDestination(key[2].GetPubKey().GetID());
     dummyTransactions[1].vout[1].nValue = 22 * CENT;
     dummyTransactions[1].vout[1].scriptPubKey =
         GetScriptForDestination(key[3].GetPubKey().GetID());
     AddCoins(coinsRet, CTransaction(dummyTransactions[1]), 0);
 
     return dummyTransactions;
 }
 
 BOOST_AUTO_TEST_CASE(test_Get) {
     CBasicKeyStore keystore;
     CCoinsView coinsDummy;
     CCoinsViewCache coins(&coinsDummy);
     std::vector<CMutableTransaction> dummyTransactions =
         SetupDummyInputs(keystore, coins);
 
     CMutableTransaction t1;
     t1.vin.resize(3);
     t1.vin[0].prevout = COutPoint(dummyTransactions[0].GetId(), 1);
     t1.vin[0].scriptSig << std::vector<uint8_t>(65, 0);
     t1.vin[1].prevout = COutPoint(dummyTransactions[1].GetId(), 0);
     t1.vin[1].scriptSig << std::vector<uint8_t>(65, 0)
                         << std::vector<uint8_t>(33, 4);
     t1.vin[2].prevout = COutPoint(dummyTransactions[1].GetId(), 1);
     t1.vin[2].scriptSig << std::vector<uint8_t>(65, 0)
                         << std::vector<uint8_t>(33, 4);
     t1.vout.resize(2);
     t1.vout[0].nValue = 90 * CENT;
     t1.vout[0].scriptPubKey << OP_1;
 
     BOOST_CHECK(AreInputsStandard(CTransaction(t1), coins));
     BOOST_CHECK_EQUAL(coins.GetValueIn(CTransaction(t1)),
                       (50 + 21 + 22) * CENT);
 }
 
 static void CreateCreditAndSpend(const CKeyStore &keystore,
                                  const CScript &outscript,
                                  CTransactionRef &output,
                                  CMutableTransaction &input,
                                  bool success = true) {
     CMutableTransaction outputm;
     outputm.nVersion = 1;
     outputm.vin.resize(1);
     outputm.vin[0].prevout = COutPoint();
     outputm.vin[0].scriptSig = CScript();
     outputm.vout.resize(1);
     outputm.vout[0].nValue = SATOSHI;
     outputm.vout[0].scriptPubKey = outscript;
     CDataStream ssout(SER_NETWORK, PROTOCOL_VERSION);
     ssout << outputm;
     ssout >> output;
     BOOST_CHECK_EQUAL(output->vin.size(), 1UL);
     BOOST_CHECK(output->vin[0] == outputm.vin[0]);
     BOOST_CHECK_EQUAL(output->vout.size(), 1UL);
     BOOST_CHECK(output->vout[0] == outputm.vout[0]);
 
     CMutableTransaction inputm;
     inputm.nVersion = 1;
     inputm.vin.resize(1);
     inputm.vin[0].prevout = COutPoint(output->GetId(), 0);
     inputm.vout.resize(1);
     inputm.vout[0].nValue = SATOSHI;
     inputm.vout[0].scriptPubKey = CScript();
     bool ret =
         SignSignature(keystore, *output, inputm, 0, SigHashType().withForkId());
     BOOST_CHECK_EQUAL(ret, success);
     CDataStream ssin(SER_NETWORK, PROTOCOL_VERSION);
     ssin << inputm;
     ssin >> input;
     BOOST_CHECK_EQUAL(input.vin.size(), 1UL);
     BOOST_CHECK(input.vin[0] == inputm.vin[0]);
     BOOST_CHECK_EQUAL(input.vout.size(), 1UL);
     BOOST_CHECK(input.vout[0] == inputm.vout[0]);
 }
 
 static void CheckWithFlag(const CTransactionRef &output,
                           const CMutableTransaction &input, int flags,
                           bool success) {
     ScriptError error;
     CTransaction inputi(input);
     bool ret = VerifyScript(
         inputi.vin[0].scriptSig, output->vout[0].scriptPubKey,
         flags | SCRIPT_ENABLE_SIGHASH_FORKID,
         TransactionSignatureChecker(&inputi, 0, output->vout[0].nValue),
         &error);
     BOOST_CHECK_EQUAL(ret, success);
 }
 
 static CScript PushAll(const std::vector<valtype> &values) {
     CScript result;
     for (const valtype &v : values) {
         if (v.size() == 0) {
             result << OP_0;
         } else if (v.size() == 1 && v[0] >= 1 && v[0] <= 16) {
             result << CScript::EncodeOP_N(v[0]);
         } else {
             result << v;
         }
     }
     return result;
 }
 
 static void ReplaceRedeemScript(CScript &script, const CScript &redeemScript) {
     std::vector<valtype> stack;
     EvalScript(stack, script, SCRIPT_VERIFY_STRICTENC, BaseSignatureChecker());
     BOOST_CHECK(stack.size() > 0);
     stack.back() =
         std::vector<uint8_t>(redeemScript.begin(), redeemScript.end());
     script = PushAll(stack);
 }
 
 BOOST_AUTO_TEST_CASE(test_big_transaction) {
     CKey key;
     key.MakeNewKey(false);
     CBasicKeyStore keystore;
     keystore.AddKeyPubKey(key, key.GetPubKey());
     CScript scriptPubKey = CScript()
                            << ToByteVector(key.GetPubKey()) << OP_CHECKSIG;
 
     std::vector<SigHashType> sigHashes;
     sigHashes.emplace_back(SIGHASH_NONE | SIGHASH_FORKID);
     sigHashes.emplace_back(SIGHASH_SINGLE | SIGHASH_FORKID);
     sigHashes.emplace_back(SIGHASH_ALL | SIGHASH_FORKID);
     sigHashes.emplace_back(SIGHASH_NONE | SIGHASH_FORKID |
                            SIGHASH_ANYONECANPAY);
     sigHashes.emplace_back(SIGHASH_SINGLE | SIGHASH_FORKID |
                            SIGHASH_ANYONECANPAY);
     sigHashes.emplace_back(SIGHASH_ALL | SIGHASH_FORKID | SIGHASH_ANYONECANPAY);
 
     CMutableTransaction mtx;
     mtx.nVersion = 1;
 
     // create a big transaction of 4500 inputs signed by the same key.
     const static size_t OUTPUT_COUNT = 4500;
     mtx.vout.reserve(OUTPUT_COUNT);
 
     for (size_t ij = 0; ij < OUTPUT_COUNT; ij++) {
         size_t i = mtx.vin.size();
         TxId prevId(uint256S("0000000000000000000000000000000000000000000000000"
                              "000000000000100"));
         COutPoint outpoint(prevId, i);
 
         mtx.vin.resize(mtx.vin.size() + 1);
         mtx.vin[i].prevout = outpoint;
         mtx.vin[i].scriptSig = CScript();
 
         mtx.vout.emplace_back(1000 * SATOSHI, CScript() << OP_1);
     }
 
     // sign all inputs
     for (size_t i = 0; i < mtx.vin.size(); i++) {
         bool hashSigned =
             SignSignature(keystore, scriptPubKey, mtx, i, 1000 * SATOSHI,
                           sigHashes.at(i % sigHashes.size()));
         BOOST_CHECK_MESSAGE(hashSigned, "Failed to sign test transaction");
     }
 
     CTransaction tx(mtx);
 
     // check all inputs concurrently, with the cache
     PrecomputedTransactionData txdata(tx);
     boost::thread_group threadGroup;
     CCheckQueue<CScriptCheck> scriptcheckqueue(128);
     CCheckQueueControl<CScriptCheck> control(&scriptcheckqueue);
 
     for (int i = 0; i < 20; i++) {
-        threadGroup.create_thread(boost::bind(
-            &CCheckQueue<CScriptCheck>::Thread, boost::ref(scriptcheckqueue)));
+        threadGroup.create_thread(std::bind(&CCheckQueue<CScriptCheck>::Thread,
+                                            std::ref(scriptcheckqueue)));
     }
 
     std::vector<Coin> coins;
     for (size_t i = 0; i < mtx.vin.size(); i++) {
         CTxOut out;
         out.nValue = 1000 * SATOSHI;
         out.scriptPubKey = scriptPubKey;
         coins.emplace_back(std::move(out), 1, false);
     }
 
     for (size_t i = 0; i < mtx.vin.size(); i++) {
         std::vector<CScriptCheck> vChecks;
         CTxOut &out = coins[tx.vin[i].prevout.GetN()].GetTxOut();
         CScriptCheck check(out.scriptPubKey, out.nValue, tx, i,
                            MANDATORY_SCRIPT_VERIFY_FLAGS, false, txdata);
         vChecks.push_back(CScriptCheck());
         check.swap(vChecks.back());
         control.Add(vChecks);
     }
 
     bool controlCheck = control.Wait();
     BOOST_CHECK(controlCheck);
 
     threadGroup.interrupt_all();
     threadGroup.join_all();
 }
 
 BOOST_AUTO_TEST_CASE(test_witness) {
     CBasicKeyStore keystore, keystore2;
     CKey key1, key2, key3, key1L, key2L;
     CPubKey pubkey1, pubkey2, pubkey3, pubkey1L, pubkey2L;
     key1.MakeNewKey(true);
     key2.MakeNewKey(true);
     key3.MakeNewKey(true);
     key1L.MakeNewKey(false);
     key2L.MakeNewKey(false);
     pubkey1 = key1.GetPubKey();
     pubkey2 = key2.GetPubKey();
     pubkey3 = key3.GetPubKey();
     pubkey1L = key1L.GetPubKey();
     pubkey2L = key2L.GetPubKey();
     keystore.AddKeyPubKey(key1, pubkey1);
     keystore.AddKeyPubKey(key2, pubkey2);
     keystore.AddKeyPubKey(key1L, pubkey1L);
     keystore.AddKeyPubKey(key2L, pubkey2L);
     CScript scriptPubkey1, scriptPubkey2, scriptPubkey1L, scriptPubkey2L,
         scriptMulti;
     scriptPubkey1 << ToByteVector(pubkey1) << OP_CHECKSIG;
     scriptPubkey2 << ToByteVector(pubkey2) << OP_CHECKSIG;
     scriptPubkey1L << ToByteVector(pubkey1L) << OP_CHECKSIG;
     scriptPubkey2L << ToByteVector(pubkey2L) << OP_CHECKSIG;
     std::vector<CPubKey> oneandthree;
     oneandthree.push_back(pubkey1);
     oneandthree.push_back(pubkey3);
     scriptMulti = GetScriptForMultisig(2, oneandthree);
     keystore.AddCScript(scriptPubkey1);
     keystore.AddCScript(scriptPubkey2);
     keystore.AddCScript(scriptPubkey1L);
     keystore.AddCScript(scriptPubkey2L);
     keystore.AddCScript(scriptMulti);
     keystore2.AddCScript(scriptMulti);
     keystore2.AddKeyPubKey(key3, pubkey3);
 
     CTransactionRef output1, output2;
     CMutableTransaction input1, input2;
     SignatureData sigdata;
 
     // Normal pay-to-compressed-pubkey.
     CreateCreditAndSpend(keystore, scriptPubkey1, output1, input1);
     CreateCreditAndSpend(keystore, scriptPubkey2, output2, input2);
     CheckWithFlag(output1, input1, 0, true);
     CheckWithFlag(output1, input1, SCRIPT_VERIFY_P2SH, true);
     CheckWithFlag(output1, input1, STANDARD_SCRIPT_VERIFY_FLAGS, true);
     CheckWithFlag(output1, input2, 0, false);
     CheckWithFlag(output1, input2, SCRIPT_VERIFY_P2SH, false);
     CheckWithFlag(output1, input2, STANDARD_SCRIPT_VERIFY_FLAGS, false);
 
     // P2SH pay-to-compressed-pubkey.
     CreateCreditAndSpend(keystore,
                          GetScriptForDestination(CScriptID(scriptPubkey1)),
                          output1, input1);
     CreateCreditAndSpend(keystore,
                          GetScriptForDestination(CScriptID(scriptPubkey2)),
                          output2, input2);
     ReplaceRedeemScript(input2.vin[0].scriptSig, scriptPubkey1);
     CheckWithFlag(output1, input1, 0, true);
     CheckWithFlag(output1, input1, SCRIPT_VERIFY_P2SH, true);
     CheckWithFlag(output1, input1, STANDARD_SCRIPT_VERIFY_FLAGS, true);
     CheckWithFlag(output1, input2, 0, true);
     CheckWithFlag(output1, input2, SCRIPT_VERIFY_P2SH, false);
     CheckWithFlag(output1, input2, STANDARD_SCRIPT_VERIFY_FLAGS, false);
 
     // Normal pay-to-uncompressed-pubkey.
     CreateCreditAndSpend(keystore, scriptPubkey1L, output1, input1);
     CreateCreditAndSpend(keystore, scriptPubkey2L, output2, input2);
     CheckWithFlag(output1, input1, 0, true);
     CheckWithFlag(output1, input1, SCRIPT_VERIFY_P2SH, true);
     CheckWithFlag(output1, input1, STANDARD_SCRIPT_VERIFY_FLAGS, true);
     CheckWithFlag(output1, input2, 0, false);
     CheckWithFlag(output1, input2, SCRIPT_VERIFY_P2SH, false);
     CheckWithFlag(output1, input2, STANDARD_SCRIPT_VERIFY_FLAGS, false);
 
     // P2SH pay-to-uncompressed-pubkey.
     CreateCreditAndSpend(keystore,
                          GetScriptForDestination(CScriptID(scriptPubkey1L)),
                          output1, input1);
     CreateCreditAndSpend(keystore,
                          GetScriptForDestination(CScriptID(scriptPubkey2L)),
                          output2, input2);
     ReplaceRedeemScript(input2.vin[0].scriptSig, scriptPubkey1L);
     CheckWithFlag(output1, input1, 0, true);
     CheckWithFlag(output1, input1, SCRIPT_VERIFY_P2SH, true);
     CheckWithFlag(output1, input1, STANDARD_SCRIPT_VERIFY_FLAGS, true);
     CheckWithFlag(output1, input2, 0, true);
     CheckWithFlag(output1, input2, SCRIPT_VERIFY_P2SH, false);
     CheckWithFlag(output1, input2, STANDARD_SCRIPT_VERIFY_FLAGS, false);
 
     // Normal 2-of-2 multisig
     CreateCreditAndSpend(keystore, scriptMulti, output1, input1, false);
     CheckWithFlag(output1, input1, 0, false);
     CreateCreditAndSpend(keystore2, scriptMulti, output2, input2, false);
     CheckWithFlag(output2, input2, 0, false);
     BOOST_CHECK(*output1 == *output2);
     UpdateTransaction(
         input1, 0,
         CombineSignatures(output1->vout[0].scriptPubKey,
                           MutableTransactionSignatureChecker(
                               &input1, 0, output1->vout[0].nValue),
                           DataFromTransaction(input1, 0),
                           DataFromTransaction(input2, 0)));
     CheckWithFlag(output1, input1, STANDARD_SCRIPT_VERIFY_FLAGS, true);
 
     // P2SH 2-of-2 multisig
     CreateCreditAndSpend(keystore,
                          GetScriptForDestination(CScriptID(scriptMulti)),
                          output1, input1, false);
     CheckWithFlag(output1, input1, 0, true);
     CheckWithFlag(output1, input1, SCRIPT_VERIFY_P2SH, false);
     CreateCreditAndSpend(keystore2,
                          GetScriptForDestination(CScriptID(scriptMulti)),
                          output2, input2, false);
     CheckWithFlag(output2, input2, 0, true);
     CheckWithFlag(output2, input2, SCRIPT_VERIFY_P2SH, false);
     BOOST_CHECK(*output1 == *output2);
     UpdateTransaction(
         input1, 0,
         CombineSignatures(output1->vout[0].scriptPubKey,
                           MutableTransactionSignatureChecker(
                               &input1, 0, output1->vout[0].nValue),
                           DataFromTransaction(input1, 0),
                           DataFromTransaction(input2, 0)));
     CheckWithFlag(output1, input1, SCRIPT_VERIFY_P2SH, true);
     CheckWithFlag(output1, input1, STANDARD_SCRIPT_VERIFY_FLAGS, true);
 }
 
 BOOST_AUTO_TEST_CASE(test_IsStandard) {
     LOCK(cs_main);
     CBasicKeyStore keystore;
     CCoinsView coinsDummy;
     CCoinsViewCache coins(&coinsDummy);
     std::vector<CMutableTransaction> dummyTransactions =
         SetupDummyInputs(keystore, coins);
 
     CMutableTransaction t;
     t.vin.resize(1);
     t.vin[0].prevout = COutPoint(dummyTransactions[0].GetId(), 1);
     t.vin[0].scriptSig << std::vector<uint8_t>(65, 0);
     t.vout.resize(1);
     t.vout[0].nValue = 90 * CENT;
     CKey key;
     key.MakeNewKey(true);
     t.vout[0].scriptPubKey = GetScriptForDestination(key.GetPubKey().GetID());
 
     std::string reason;
     BOOST_CHECK(IsStandardTx(CTransaction(t), reason));
 
     // Check dust with default relay fee:
     Amount nDustThreshold = 3 * 182 * dustRelayFee.GetFeePerK() / 1000;
     BOOST_CHECK_EQUAL(nDustThreshold, 546 * SATOSHI);
     // dust:
     t.vout[0].nValue = nDustThreshold - SATOSHI;
     BOOST_CHECK(!IsStandardTx(CTransaction(t), reason));
     // not dust:
     t.vout[0].nValue = nDustThreshold;
     BOOST_CHECK(IsStandardTx(CTransaction(t), reason));
 
     // Check dust with odd relay fee to verify rounding:
     // nDustThreshold = 182 * 1234 / 1000 * 3
     dustRelayFee = CFeeRate(1234 * SATOSHI);
     // dust:
     t.vout[0].nValue = (672 - 1) * SATOSHI;
     BOOST_CHECK(!IsStandardTx(CTransaction(t), reason));
     // not dust:
     t.vout[0].nValue = 672 * SATOSHI;
     BOOST_CHECK(IsStandardTx(CTransaction(t), reason));
     dustRelayFee = CFeeRate(DUST_RELAY_TX_FEE);
 
     t.vout[0].scriptPubKey = CScript() << OP_1;
     BOOST_CHECK(!IsStandardTx(CTransaction(t), reason));
 
     // MAX_OP_RETURN_RELAY-byte TX_NULL_DATA (standard)
     t.vout[0].scriptPubKey =
         CScript() << OP_RETURN
                   << ParseHex("646578784062697477617463682e636f2092c558ed52c56d"
                               "8dd14ca76226bc936a84820d898443873eb03d8854b21fa3"
                               "952b99a2981873e74509281730d78a21786d34a38bd1ebab"
                               "822fad42278f7f4420db6ab1fd2b6826148d4f73bb41ec2d"
                               "40a6d5793d66e17074a0c56a8a7df21062308f483dd6e38d"
                               "53609d350038df0a1b2a9ac8332016e0b904f66880dd0108"
                               "81c4e8074cce8e4ad6c77cb3460e01bf0e7e811b5f945f83"
                               "732ba6677520a893d75d9a966cb8f85dc301656b1635c631"
                               "f5d00d4adf73f2dd112ca75cf19754651909becfbe65aed1"
                               "3afb2ab8");
     BOOST_CHECK_EQUAL(MAX_OP_RETURN_RELAY, t.vout[0].scriptPubKey.size());
     BOOST_CHECK(IsStandardTx(CTransaction(t), reason));
 
     // MAX_OP_RETURN_RELAY+1-byte TX_NULL_DATA (non-standard)
     t.vout[0].scriptPubKey =
         CScript() << OP_RETURN
                   << ParseHex("646578784062697477617463682e636f2092c558ed52c56d"
                               "8dd14ca76226bc936a84820d898443873eb03d8854b21fa3"
                               "952b99a2981873e74509281730d78a21786d34a38bd1ebab"
                               "822fad42278f7f4420db6ab1fd2b6826148d4f73bb41ec2d"
                               "40a6d5793d66e17074a0c56a8a7df21062308f483dd6e38d"
                               "53609d350038df0a1b2a9ac8332016e0b904f66880dd0108"
                               "81c4e8074cce8e4ad6c77cb3460e01bf0e7e811b5f945f83"
                               "732ba6677520a893d75d9a966cb8f85dc301656b1635c631"
                               "f5d00d4adf73f2dd112ca75cf19754651909becfbe65aed1"
                               "3afb2ab800");
     BOOST_CHECK_EQUAL(MAX_OP_RETURN_RELAY + 1, t.vout[0].scriptPubKey.size());
     BOOST_CHECK(!IsStandardTx(CTransaction(t), reason));
 
     /**
      * Check when a custom value is used for -datacarriersize .
      */
     unsigned newMaxSize = 90;
     gArgs.ForceSetArg("-datacarriersize", std::to_string(newMaxSize));
 
     // Max user provided payload size is standard
     t.vout[0].scriptPubKey =
         CScript() << OP_RETURN
                   << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909"
                               "a67962e0ea1f61deb649f6bc3f4cef3804678afdb0fe5548"
                               "271967f1a67130b7105cd6a828e03909a67962e0ea1f61de"
                               "b649f6bc3f4cef3877696e64657878");
     BOOST_CHECK_EQUAL(t.vout[0].scriptPubKey.size(), newMaxSize);
     BOOST_CHECK(IsStandardTx(CTransaction(t), reason));
 
     // Max user provided payload size + 1 is non-standard
     t.vout[0].scriptPubKey =
         CScript() << OP_RETURN
                   << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909"
                               "a67962e0ea1f61deb649f6bc3f4cef3804678afdb0fe5548"
                               "271967f1a67130b7105cd6a828e03909a67962e0ea1f61de"
                               "b649f6bc3f4cef3877696e6465787800");
     BOOST_CHECK_EQUAL(t.vout[0].scriptPubKey.size(), newMaxSize + 1);
     BOOST_CHECK(!IsStandardTx(CTransaction(t), reason));
 
     // Clear custom confirguration.
     gArgs.ClearArg("-datacarriersize");
 
     // Data payload can be encoded in any way...
     t.vout[0].scriptPubKey = CScript() << OP_RETURN << ParseHex("");
     BOOST_CHECK(IsStandardTx(CTransaction(t), reason));
     t.vout[0].scriptPubKey = CScript()
                              << OP_RETURN << ParseHex("00") << ParseHex("01");
     BOOST_CHECK(IsStandardTx(CTransaction(t), reason));
     // OP_RESERVED *is* considered to be a PUSHDATA type opcode by IsPushOnly()!
     t.vout[0].scriptPubKey = CScript() << OP_RETURN << OP_RESERVED << -1 << 0
                                        << ParseHex("01") << 2 << 3 << 4 << 5
                                        << 6 << 7 << 8 << 9 << 10 << 11 << 12
                                        << 13 << 14 << 15 << 16;
     BOOST_CHECK(IsStandardTx(CTransaction(t), reason));
     t.vout[0].scriptPubKey = CScript()
                              << OP_RETURN << 0 << ParseHex("01") << 2
                              << ParseHex("fffffffffffffffffffffffffffffffffffff"
                                          "fffffffffffffffffffffffffffffffffff");
     BOOST_CHECK(IsStandardTx(CTransaction(t), reason));
 
     // ...so long as it only contains PUSHDATA's
     t.vout[0].scriptPubKey = CScript() << OP_RETURN << OP_RETURN;
     BOOST_CHECK(!IsStandardTx(CTransaction(t), reason));
 
     // TX_NULL_DATA w/o PUSHDATA
     t.vout.resize(1);
     t.vout[0].scriptPubKey = CScript() << OP_RETURN;
     BOOST_CHECK(IsStandardTx(CTransaction(t), reason));
 
     // Only one TX_NULL_DATA permitted in all cases
     t.vout.resize(2);
     t.vout[0].scriptPubKey =
         CScript() << OP_RETURN
                   << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909"
                               "a67962e0ea1f61deb649f6bc3f4cef38");
     t.vout[1].scriptPubKey =
         CScript() << OP_RETURN
                   << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909"
                               "a67962e0ea1f61deb649f6bc3f4cef38");
     BOOST_CHECK(!IsStandardTx(CTransaction(t), reason));
 
     t.vout[0].scriptPubKey =
         CScript() << OP_RETURN
                   << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909"
                               "a67962e0ea1f61deb649f6bc3f4cef38");
     t.vout[1].scriptPubKey = CScript() << OP_RETURN;
     BOOST_CHECK(!IsStandardTx(CTransaction(t), reason));
 
     t.vout[0].scriptPubKey = CScript() << OP_RETURN;
     t.vout[1].scriptPubKey = CScript() << OP_RETURN;
     BOOST_CHECK(!IsStandardTx(CTransaction(t), reason));
 }
 
 BOOST_AUTO_TEST_CASE(txsize_activation_test) {
     const Config &config = GetConfig();
     const Consensus::Params &params = config.GetChainParams().GetConsensus();
     const int32_t magneticAnomalyActivationHeight =
         params.magneticAnomalyHeight;
 
     // A minimaly sized transction.
     CTransaction minTx;
     CValidationState state;
 
     BOOST_CHECK(ContextualCheckTransaction(
         params, minTx, state, magneticAnomalyActivationHeight - 1, 5678, 1234));
     BOOST_CHECK(!ContextualCheckTransaction(
         params, minTx, state, magneticAnomalyActivationHeight, 5678, 1234));
     BOOST_CHECK_EQUAL(state.GetRejectCode(), REJECT_INVALID);
     BOOST_CHECK_EQUAL(state.GetRejectReason(), "bad-txns-undersize");
 }
 
 BOOST_AUTO_TEST_SUITE_END()
diff --git a/src/torcontrol.cpp b/src/torcontrol.cpp
index 5d172603a..033e4d526 100644
--- a/src/torcontrol.cpp
+++ b/src/torcontrol.cpp
@@ -1,891 +1,902 @@
 // Copyright (c) 2015-2016 The Bitcoin Core developers
 // Copyright (c) 2017 The Zcash developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <torcontrol.h>
 
 #include <crypto/hmac_sha256.h>
 #include <net.h>
 #include <netbase.h>
 #include <util/strencodings.h>
 #include <util/system.h>
 
 #include <boost/algorithm/string/classification.hpp>
 #include <boost/algorithm/string/predicate.hpp>
 #include <boost/algorithm/string/replace.hpp>
 #include <boost/algorithm/string/split.hpp>
-#include <boost/bind.hpp>
 #include <boost/signals2/signal.hpp>
 
 #include <event2/buffer.h>
 #include <event2/bufferevent.h>
 #include <event2/event.h>
 #include <event2/thread.h>
 #include <event2/util.h>
 
 #include <cstdlib>
 #include <deque>
 #include <set>
 #include <vector>
 
 /** Default control port */
 const std::string DEFAULT_TOR_CONTROL = "127.0.0.1:9051";
 /** Tor cookie size (from control-spec.txt) */
 static const int TOR_COOKIE_SIZE = 32;
 /** Size of client/server nonce for SAFECOOKIE */
 static const int TOR_NONCE_SIZE = 32;
 /** For computing serverHash in SAFECOOKIE */
 static const std::string TOR_SAFE_SERVERKEY =
     "Tor safe cookie authentication server-to-controller hash";
 /** For computing clientHash in SAFECOOKIE */
 static const std::string TOR_SAFE_CLIENTKEY =
     "Tor safe cookie authentication controller-to-server hash";
 /** Exponential backoff configuration - initial timeout in seconds */
 static const float RECONNECT_TIMEOUT_START = 1.0;
 /** Exponential backoff configuration - growth factor */
 static const float RECONNECT_TIMEOUT_EXP = 1.5;
 /**
  * Maximum length for lines received on TorControlConnection.
  * tor-control-spec.txt mentions that there is explicitly no limit defined to
  * line length, this is belt-and-suspenders sanity limit to prevent memory
  * exhaustion.
  */
 static const int MAX_LINE_LENGTH = 100000;
 
 /****** Low-level TorControlConnection ********/
 
 /** Reply from Tor, can be single or multi-line */
 class TorControlReply {
 public:
     TorControlReply() { Clear(); }
 
     int code;
     std::vector<std::string> lines;
 
     void Clear() {
         code = 0;
         lines.clear();
     }
 };
 
 /**
  * Low-level handling for Tor control connection.
  * Speaks the SMTP-like protocol as defined in torspec/control-spec.txt
  */
 class TorControlConnection {
 public:
     typedef std::function<void(TorControlConnection &)> ConnectionCB;
     typedef std::function<void(TorControlConnection &, const TorControlReply &)>
         ReplyHandlerCB;
 
     /** Create a new TorControlConnection.
      */
     explicit TorControlConnection(struct event_base *base);
     ~TorControlConnection();
 
     /**
      * Connect to a Tor control port.
      * target is address of the form host:port.
      * connected is the handler that is called when connection is successfully
      * established.
      * disconnected is a handler that is called when the connection is broken.
      * Return true on success.
      */
     bool Connect(const std::string &target, const ConnectionCB &connected,
                  const ConnectionCB &disconnected);
 
     /**
      * Disconnect from Tor control port.
      */
     bool Disconnect();
 
     /**
      * Send a command, register a handler for the reply.
      * A trailing CRLF is automatically added.
      * Return true on success.
      */
     bool Command(const std::string &cmd, const ReplyHandlerCB &reply_handler);
 
     /** Response handlers for async replies */
     boost::signals2::signal<void(TorControlConnection &,
                                  const TorControlReply &)>
         async_handler;
 
 private:
     /** Callback when ready for use */
     std::function<void(TorControlConnection &)> connected;
     /** Callback when connection lost */
     std::function<void(TorControlConnection &)> disconnected;
     /** Libevent event base */
     struct event_base *base;
     /** Connection to control socket */
     struct bufferevent *b_conn;
     /** Message being received */
     TorControlReply message;
     /** Response handlers */
     std::deque<ReplyHandlerCB> reply_handlers;
 
     /** Libevent handlers: internal */
     static void readcb(struct bufferevent *bev, void *ctx);
     static void eventcb(struct bufferevent *bev, short what, void *ctx);
 };
 
 TorControlConnection::TorControlConnection(struct event_base *_base)
     : base(_base), b_conn(nullptr) {}
 
 TorControlConnection::~TorControlConnection() {
     if (b_conn) {
         bufferevent_free(b_conn);
     }
 }
 
 void TorControlConnection::readcb(struct bufferevent *bev, void *ctx) {
     TorControlConnection *self = static_cast<TorControlConnection *>(ctx);
     struct evbuffer *input = bufferevent_get_input(bev);
     size_t n_read_out = 0;
     char *line;
     assert(input);
     // If there is not a whole line to read, evbuffer_readln returns nullptr
     while ((line = evbuffer_readln(input, &n_read_out, EVBUFFER_EOL_CRLF)) !=
            nullptr) {
         std::string s(line, n_read_out);
         free(line);
         // Short line
         if (s.size() < 4) {
             continue;
         }
         // <status>(-|+| )<data><CRLF>
         self->message.code = atoi(s.substr(0, 3));
         self->message.lines.push_back(s.substr(4));
         // '-','+' or ' '
         char ch = s[3];
         if (ch == ' ') {
             // Final line, dispatch reply and clean up
             if (self->message.code >= 600) {
                 // Dispatch async notifications to async handler.
                 // Synchronous and asynchronous messages are never interleaved
                 self->async_handler(*self, self->message);
             } else {
                 if (!self->reply_handlers.empty()) {
                     // Invoke reply handler with message
                     self->reply_handlers.front()(*self, self->message);
                     self->reply_handlers.pop_front();
                 } else {
                     LogPrint(BCLog::TOR,
                              "tor: Received unexpected sync reply %i\n",
                              self->message.code);
                 }
             }
             self->message.Clear();
         }
     }
 
     // Check for size of buffer - protect against memory exhaustion with very
     // long lines. Do this after evbuffer_readln to make sure all full lines
     // have been removed from the buffer. Everything left is an incomplete line.
     if (evbuffer_get_length(input) > MAX_LINE_LENGTH) {
         LogPrintf("tor: Disconnecting because MAX_LINE_LENGTH exceeded\n");
         self->Disconnect();
     }
 }
 
 void TorControlConnection::eventcb(struct bufferevent *bev, short what,
                                    void *ctx) {
     TorControlConnection *self = static_cast<TorControlConnection *>(ctx);
     if (what & BEV_EVENT_CONNECTED) {
         LogPrint(BCLog::TOR, "tor: Successfully connected!\n");
         self->connected(*self);
     } else if (what & (BEV_EVENT_EOF | BEV_EVENT_ERROR)) {
         if (what & BEV_EVENT_ERROR) {
             LogPrint(BCLog::TOR,
                      "tor: Error connecting to Tor control socket\n");
         } else {
             LogPrint(BCLog::TOR, "tor: End of stream\n");
         }
         self->Disconnect();
         self->disconnected(*self);
     }
 }
 
 bool TorControlConnection::Connect(const std::string &target,
                                    const ConnectionCB &_connected,
                                    const ConnectionCB &_disconnected) {
     if (b_conn) {
         Disconnect();
     }
     // Parse target address:port
     struct sockaddr_storage connect_to_addr;
     int connect_to_addrlen = sizeof(connect_to_addr);
     if (evutil_parse_sockaddr_port(target.c_str(),
                                    (struct sockaddr *)&connect_to_addr,
                                    &connect_to_addrlen) < 0) {
         LogPrintf("tor: Error parsing socket address %s\n", target);
         return false;
     }
 
     // Create a new socket, set up callbacks and enable notification bits
     b_conn = bufferevent_socket_new(base, -1, BEV_OPT_CLOSE_ON_FREE);
     if (!b_conn) {
         return false;
     }
     bufferevent_setcb(b_conn, TorControlConnection::readcb, nullptr,
                       TorControlConnection::eventcb, this);
     bufferevent_enable(b_conn, EV_READ | EV_WRITE);
     this->connected = _connected;
     this->disconnected = _disconnected;
 
     // Finally, connect to target
     if (bufferevent_socket_connect(b_conn, (struct sockaddr *)&connect_to_addr,
                                    connect_to_addrlen) < 0) {
         LogPrintf("tor: Error connecting to address %s\n", target);
         return false;
     }
     return true;
 }
 
 bool TorControlConnection::Disconnect() {
     if (b_conn) {
         bufferevent_free(b_conn);
     }
     b_conn = nullptr;
     return true;
 }
 
 bool TorControlConnection::Command(const std::string &cmd,
                                    const ReplyHandlerCB &reply_handler) {
     if (!b_conn) {
         return false;
     }
     struct evbuffer *buf = bufferevent_get_output(b_conn);
     if (!buf) {
         return false;
     }
     evbuffer_add(buf, cmd.data(), cmd.size());
     evbuffer_add(buf, "\r\n", 2);
     reply_handlers.push_back(reply_handler);
     return true;
 }
 
 /****** General parsing utilities ********/
 
 /* Split reply line in the form 'AUTH METHODS=...' into a type
  * 'AUTH' and arguments 'METHODS=...'.
  * Grammar is implicitly defined in https://spec.torproject.org/control-spec by
  * the server reply formats for PROTOCOLINFO (S3.21) and AUTHCHALLENGE (S3.24).
  */
 std::pair<std::string, std::string> SplitTorReplyLine(const std::string &s) {
     size_t ptr = 0;
     std::string type;
     while (ptr < s.size() && s[ptr] != ' ') {
         type.push_back(s[ptr]);
         ++ptr;
     }
     if (ptr < s.size()) {
         // skip ' '
         ++ptr;
     }
     return make_pair(type, s.substr(ptr));
 }
 
 /**
  * Parse reply arguments in the form 'METHODS=COOKIE,SAFECOOKIE
  * COOKIEFILE=".../control_auth_cookie"'.
  * Returns a map of keys to values, or an empty map if there was an error.
  * Grammar is implicitly defined in https://spec.torproject.org/control-spec by
  * the server reply formats for PROTOCOLINFO (S3.21), AUTHCHALLENGE (S3.24),
  * and ADD_ONION (S3.27). See also sections 2.1 and 2.3.
  */
 std::map<std::string, std::string> ParseTorReplyMapping(const std::string &s) {
     std::map<std::string, std::string> mapping;
     size_t ptr = 0;
     while (ptr < s.size()) {
         std::string key, value;
         while (ptr < s.size() && s[ptr] != '=' && s[ptr] != ' ') {
             key.push_back(s[ptr]);
             ++ptr;
         }
         // unexpected end of line
         if (ptr == s.size()) {
             return std::map<std::string, std::string>();
         }
         // The remaining string is an OptArguments
         if (s[ptr] == ' ') {
             break;
         }
         // skip '='
         ++ptr;
         // Quoted string
         if (ptr < s.size() && s[ptr] == '"') {
             // skip opening '"'
             ++ptr;
             bool escape_next = false;
             while (ptr < s.size() && (escape_next || s[ptr] != '"')) {
                 // Repeated backslashes must be interpreted as pairs
                 escape_next = (s[ptr] == '\\' && !escape_next);
                 value.push_back(s[ptr]);
                 ++ptr;
             }
             // unexpected end of line
             if (ptr == s.size()) {
                 return std::map<std::string, std::string>();
             }
             // skip closing '"'
             ++ptr;
             /**
              * Unescape value. Per https://spec.torproject.org/control-spec
              * section 2.1.1:
              *
              * For future-proofing, controller implementors MAY use the
              * following rules to be compatible with buggy Tor implementations
              * and with future ones that implement the spec as intended:
              *
              * Read \n \t \r and \0 ... \377 as C escapes.
              * Treat a backslash followed by any other character as that
              * character.
              */
             std::string escaped_value;
             for (size_t i = 0; i < value.size(); ++i) {
                 if (value[i] == '\\') {
                     // This will always be valid, because if the QuotedString
                     // ended in an odd number of backslashes, then the parser
                     // would already have returned above, due to a missing
                     // terminating double-quote.
                     ++i;
                     if (value[i] == 'n') {
                         escaped_value.push_back('\n');
                     } else if (value[i] == 't') {
                         escaped_value.push_back('\t');
                     } else if (value[i] == 'r') {
                         escaped_value.push_back('\r');
                     } else if ('0' <= value[i] && value[i] <= '7') {
                         size_t j;
                         // Octal escape sequences have a limit of three octal
                         // digits, but terminate at the first character that is
                         // not a valid octal digit if encountered sooner.
                         for (j = 1; j < 3 && (i + j) < value.size() &&
                                     '0' <= value[i + j] && value[i + j] <= '7';
                              ++j) {
                         }
                         // Tor restricts first digit to 0-3 for three-digit
                         // octals. A leading digit of 4-7 would therefore be
                         // interpreted as a two-digit octal.
                         if (j == 3 && value[i] > '3') {
                             j--;
                         }
                         escaped_value.push_back(
                             strtol(value.substr(i, j).c_str(), NULL, 8));
                         // Account for automatic incrementing at loop end
                         i += j - 1;
                     } else {
                         escaped_value.push_back(value[i]);
                     }
                 } else {
                     escaped_value.push_back(value[i]);
                 }
             }
             value = escaped_value;
         } else {
             // Unquoted value. Note that values can contain '=' at will, just no
             // spaces
             while (ptr < s.size() && s[ptr] != ' ') {
                 value.push_back(s[ptr]);
                 ++ptr;
             }
         }
         if (ptr < s.size() && s[ptr] == ' ') {
             // skip ' ' after key=value
             ++ptr;
         }
         mapping[key] = value;
     }
     return mapping;
 }
 
 /**
  * Read full contents of a file and return them in a std::string.
  * Returns a pair <status, string>.
  * If an error occurred, status will be false, otherwise status will be true and
  * the data will be returned in string.
  *
  * @param maxsize Puts a maximum size limit on the file that is read. If the
  * file is larger than this, truncated data
  *         (with len > maxsize) will be returned.
  */
 static std::pair<bool, std::string>
 ReadBinaryFile(const fs::path &filename,
                size_t maxsize = std::numeric_limits<size_t>::max()) {
     FILE *f = fsbridge::fopen(filename, "rb");
     if (f == nullptr) {
         return std::make_pair(false, "");
     }
     std::string retval;
     char buffer[128];
     size_t n;
     while ((n = fread(buffer, 1, sizeof(buffer), f)) > 0) {
         // Check for reading errors so we don't return any data if we couldn't
         // read the entire file (or up to maxsize)
         if (ferror(f)) {
             fclose(f);
             return std::make_pair(false, "");
         }
         retval.append(buffer, buffer + n);
         if (retval.size() > maxsize) {
             break;
         }
     }
     fclose(f);
     return std::make_pair(true, retval);
 }
 
 /**
  * Write contents of std::string to a file.
  * @return true on success.
  */
 static bool WriteBinaryFile(const fs::path &filename, const std::string &data) {
     FILE *f = fsbridge::fopen(filename, "wb");
     if (f == nullptr) {
         return false;
     }
     if (fwrite(data.data(), 1, data.size(), f) != data.size()) {
         fclose(f);
         return false;
     }
     fclose(f);
     return true;
 }
 
 /****** Bitcoin specific TorController implementation ********/
 
 /**
  * Controller that connects to Tor control socket, authenticate, then create
  * and maintain an ephemeral hidden service.
  */
 class TorController {
 public:
     TorController(struct event_base *base, const std::string &target);
     ~TorController();
 
     /** Get name fo file to store private key in */
     fs::path GetPrivateKeyFile();
 
     /** Reconnect, after getting disconnected */
     void Reconnect();
 
 private:
     struct event_base *base;
     std::string target;
     TorControlConnection conn;
     std::string private_key;
     std::string service_id;
     bool reconnect;
     struct event *reconnect_ev;
     float reconnect_timeout;
     CService service;
     /** Cookie for SAFECOOKIE auth */
     std::vector<uint8_t> cookie;
     /** ClientNonce for SAFECOOKIE auth */
     std::vector<uint8_t> clientNonce;
 
     /** Callback for ADD_ONION result */
     void add_onion_cb(TorControlConnection &conn, const TorControlReply &reply);
     /** Callback for AUTHENTICATE result */
     void auth_cb(TorControlConnection &conn, const TorControlReply &reply);
     /** Callback for AUTHCHALLENGE result */
     void authchallenge_cb(TorControlConnection &conn,
                           const TorControlReply &reply);
     /** Callback for PROTOCOLINFO result */
     void protocolinfo_cb(TorControlConnection &conn,
                          const TorControlReply &reply);
     /** Callback after successful connection */
     void connected_cb(TorControlConnection &conn);
     /** Callback after connection lost or failed connection attempt */
     void disconnected_cb(TorControlConnection &conn);
 
     /** Callback for reconnect timer */
     static void reconnect_cb(evutil_socket_t fd, short what, void *arg);
 };
 
 TorController::TorController(struct event_base *_base,
                              const std::string &_target)
     : base(_base), target(_target), conn(base), reconnect(true),
       reconnect_ev(0), reconnect_timeout(RECONNECT_TIMEOUT_START) {
     reconnect_ev = event_new(base, -1, 0, reconnect_cb, this);
     if (!reconnect_ev) {
         LogPrintf(
             "tor: Failed to create event for reconnection: out of memory?\n");
     }
     // Start connection attempts immediately
     if (!conn.Connect(_target,
-                      boost::bind(&TorController::connected_cb, this, _1),
-                      boost::bind(&TorController::disconnected_cb, this, _1))) {
+                      std::bind(&TorController::connected_cb, this,
+                                std::placeholders::_1),
+                      std::bind(&TorController::disconnected_cb, this,
+                                std::placeholders::_1))) {
         LogPrintf("tor: Initiating connection to Tor control port %s failed\n",
                   _target);
     }
     // Read service private key if cached
     std::pair<bool, std::string> pkf = ReadBinaryFile(GetPrivateKeyFile());
     if (pkf.first) {
         LogPrint(BCLog::TOR, "tor: Reading cached private key from %s\n",
                  GetPrivateKeyFile());
         private_key = pkf.second;
     }
 }
 
 TorController::~TorController() {
     if (reconnect_ev) {
         event_free(reconnect_ev);
         reconnect_ev = nullptr;
     }
     if (service.IsValid()) {
         RemoveLocal(service);
     }
 }
 
 void TorController::add_onion_cb(TorControlConnection &_conn,
                                  const TorControlReply &reply) {
     if (reply.code == 250) {
         LogPrint(BCLog::TOR, "tor: ADD_ONION successful\n");
         for (const std::string &s : reply.lines) {
             std::map<std::string, std::string> m = ParseTorReplyMapping(s);
             std::map<std::string, std::string>::iterator i;
             if ((i = m.find("ServiceID")) != m.end()) {
                 service_id = i->second;
             }
             if ((i = m.find("PrivateKey")) != m.end()) {
                 private_key = i->second;
             }
         }
         if (service_id.empty()) {
             LogPrintf("tor: Error parsing ADD_ONION parameters:\n");
             for (const std::string &s : reply.lines) {
                 LogPrintf("    %s\n", SanitizeString(s));
             }
             return;
         }
         service = LookupNumeric(std::string(service_id + ".onion").c_str(),
                                 GetListenPort());
         LogPrintf("tor: Got service ID %s, advertising service %s\n",
                   service_id, service.ToString());
         if (WriteBinaryFile(GetPrivateKeyFile(), private_key)) {
             LogPrint(BCLog::TOR, "tor: Cached service private key to %s\n",
                      GetPrivateKeyFile());
         } else {
             LogPrintf("tor: Error writing service private key to %s\n",
                       GetPrivateKeyFile());
         }
         AddLocal(service, LOCAL_MANUAL);
         // ... onion requested - keep connection open
     } else if (reply.code == 510) { // 510 Unrecognized command
         LogPrintf("tor: Add onion failed with unrecognized command (You "
                   "probably need to upgrade Tor)\n");
     } else {
         LogPrintf("tor: Add onion failed; error code %d\n", reply.code);
     }
 }
 
 void TorController::auth_cb(TorControlConnection &_conn,
                             const TorControlReply &reply) {
     if (reply.code == 250) {
         LogPrint(BCLog::TOR, "tor: Authentication successful\n");
 
         // Now that we know Tor is running setup the proxy for onion addresses
         // if -onion isn't set to something else.
         if (gArgs.GetArg("-onion", "") == "") {
             CService resolved(LookupNumeric("127.0.0.1", 9050));
             proxyType addrOnion = proxyType(resolved, true);
             SetProxy(NET_ONION, addrOnion);
             SetLimited(NET_ONION, false);
         }
 
         // Finally - now create the service
         // No private key, generate one
         if (private_key.empty()) {
             // Explicitly request RSA1024 - see issue #9214
             private_key = "NEW:RSA1024";
         }
         // Request hidden service, redirect port.
         // Note that the 'virtual' port doesn't have to be the same as our
         // internal port, but this is just a convenient choice. TODO; refactor
         // the shutdown sequence some day.
         _conn.Command(strprintf("ADD_ONION %s Port=%i,127.0.0.1:%i",
                                 private_key, GetListenPort(), GetListenPort()),
-                      boost::bind(&TorController::add_onion_cb, this, _1, _2));
+                      std::bind(&TorController::add_onion_cb, this,
+                                std::placeholders::_1, std::placeholders::_2));
     } else {
         LogPrintf("tor: Authentication failed\n");
     }
 }
 
 /** Compute Tor SAFECOOKIE response.
  *
  *    ServerHash is computed as:
  *      HMAC-SHA256("Tor safe cookie authentication server-to-controller hash",
  *                  CookieString | ClientNonce | ServerNonce)
  *    (with the HMAC key as its first argument)
  *
  *    After a controller sends a successful AUTHCHALLENGE command, the
  *    next command sent on the connection must be an AUTHENTICATE command,
  *    and the only authentication string which that AUTHENTICATE command
  *    will accept is:
  *
  *      HMAC-SHA256("Tor safe cookie authentication controller-to-server hash",
  *                  CookieString | ClientNonce | ServerNonce)
  *
  */
 static std::vector<uint8_t>
 ComputeResponse(const std::string &key, const std::vector<uint8_t> &cookie,
                 const std::vector<uint8_t> &clientNonce,
                 const std::vector<uint8_t> &serverNonce) {
     CHMAC_SHA256 computeHash((const uint8_t *)key.data(), key.size());
     std::vector<uint8_t> computedHash(CHMAC_SHA256::OUTPUT_SIZE, 0);
     computeHash.Write(cookie.data(), cookie.size());
     computeHash.Write(clientNonce.data(), clientNonce.size());
     computeHash.Write(serverNonce.data(), serverNonce.size());
     computeHash.Finalize(computedHash.data());
     return computedHash;
 }
 
 void TorController::authchallenge_cb(TorControlConnection &_conn,
                                      const TorControlReply &reply) {
     if (reply.code == 250) {
         LogPrint(BCLog::TOR,
                  "tor: SAFECOOKIE authentication challenge successful\n");
         std::pair<std::string, std::string> l =
             SplitTorReplyLine(reply.lines[0]);
         if (l.first == "AUTHCHALLENGE") {
             std::map<std::string, std::string> m =
                 ParseTorReplyMapping(l.second);
             if (m.empty()) {
                 LogPrintf("tor: Error parsing AUTHCHALLENGE parameters: %s\n",
                           SanitizeString(l.second));
                 return;
             }
             std::vector<uint8_t> serverHash = ParseHex(m["SERVERHASH"]);
             std::vector<uint8_t> serverNonce = ParseHex(m["SERVERNONCE"]);
             LogPrint(BCLog::TOR,
                      "tor: AUTHCHALLENGE ServerHash %s ServerNonce %s\n",
                      HexStr(serverHash), HexStr(serverNonce));
             if (serverNonce.size() != 32) {
                 LogPrintf(
                     "tor: ServerNonce is not 32 bytes, as required by spec\n");
                 return;
             }
 
             std::vector<uint8_t> computedServerHash = ComputeResponse(
                 TOR_SAFE_SERVERKEY, cookie, clientNonce, serverNonce);
             if (computedServerHash != serverHash) {
                 LogPrintf("tor: ServerHash %s does not match expected "
                           "ServerHash %s\n",
                           HexStr(serverHash), HexStr(computedServerHash));
                 return;
             }
 
             std::vector<uint8_t> computedClientHash = ComputeResponse(
                 TOR_SAFE_CLIENTKEY, cookie, clientNonce, serverNonce);
             _conn.Command("AUTHENTICATE " + HexStr(computedClientHash),
-                          boost::bind(&TorController::auth_cb, this, _1, _2));
+                          std::bind(&TorController::auth_cb, this,
+                                    std::placeholders::_1,
+                                    std::placeholders::_2));
         } else {
             LogPrintf("tor: Invalid reply to AUTHCHALLENGE\n");
         }
     } else {
         LogPrintf("tor: SAFECOOKIE authentication challenge failed\n");
     }
 }
 
 void TorController::protocolinfo_cb(TorControlConnection &_conn,
                                     const TorControlReply &reply) {
     if (reply.code == 250) {
         std::set<std::string> methods;
         std::string cookiefile;
         /*
          * 250-AUTH METHODS=COOKIE,SAFECOOKIE
          * COOKIEFILE="/home/x/.tor/control_auth_cookie"
          * 250-AUTH METHODS=NULL
          * 250-AUTH METHODS=HASHEDPASSWORD
          */
         for (const std::string &s : reply.lines) {
             std::pair<std::string, std::string> l = SplitTorReplyLine(s);
             if (l.first == "AUTH") {
                 std::map<std::string, std::string> m =
                     ParseTorReplyMapping(l.second);
                 std::map<std::string, std::string>::iterator i;
                 if ((i = m.find("METHODS")) != m.end()) {
                     boost::split(methods, i->second, boost::is_any_of(","));
                 }
                 if ((i = m.find("COOKIEFILE")) != m.end()) {
                     cookiefile = i->second;
                 }
             } else if (l.first == "VERSION") {
                 std::map<std::string, std::string> m =
                     ParseTorReplyMapping(l.second);
                 std::map<std::string, std::string>::iterator i;
                 if ((i = m.find("Tor")) != m.end()) {
                     LogPrint(BCLog::TOR, "tor: Connected to Tor version %s\n",
                              i->second);
                 }
             }
         }
         for (const std::string &s : methods) {
             LogPrint(BCLog::TOR, "tor: Supported authentication method: %s\n",
                      s);
         }
         // Prefer NULL, otherwise SAFECOOKIE. If a password is provided, use
         // HASHEDPASSWORD
         /* Authentication:
          *   cookie:   hex-encoded ~/.tor/control_auth_cookie
          *   password: "password"
          */
         std::string torpassword = gArgs.GetArg("-torpassword", "");
         if (!torpassword.empty()) {
             if (methods.count("HASHEDPASSWORD")) {
                 LogPrint(BCLog::TOR,
                          "tor: Using HASHEDPASSWORD authentication\n");
                 boost::replace_all(torpassword, "\"", "\\\"");
-                _conn.Command(
-                    "AUTHENTICATE \"" + torpassword + "\"",
-                    boost::bind(&TorController::auth_cb, this, _1, _2));
+                _conn.Command("AUTHENTICATE \"" + torpassword + "\"",
+                              std::bind(&TorController::auth_cb, this,
+                                        std::placeholders::_1,
+                                        std::placeholders::_2));
             } else {
                 LogPrintf("tor: Password provided with -torpassword, but "
                           "HASHEDPASSWORD authentication is not available\n");
             }
         } else if (methods.count("NULL")) {
             LogPrint(BCLog::TOR, "tor: Using NULL authentication\n");
-            _conn.Command("AUTHENTICATE",
-                          boost::bind(&TorController::auth_cb, this, _1, _2));
+            _conn.Command("AUTHENTICATE", std::bind(&TorController::auth_cb,
+                                                    this, std::placeholders::_1,
+                                                    std::placeholders::_2));
         } else if (methods.count("SAFECOOKIE")) {
             // Cookie: hexdump -e '32/1 "%02x""\n"'  ~/.tor/control_auth_cookie
             LogPrint(BCLog::TOR,
                      "tor: Using SAFECOOKIE authentication, "
                      "reading cookie authentication from %s\n",
                      cookiefile);
             std::pair<bool, std::string> status_cookie =
                 ReadBinaryFile(cookiefile, TOR_COOKIE_SIZE);
             if (status_cookie.first &&
                 status_cookie.second.size() == TOR_COOKIE_SIZE) {
                 // _conn.Command("AUTHENTICATE " + HexStr(status_cookie.second),
-                // boost::bind(&TorController::auth_cb, this, _1, _2));
+                // std::bind(&TorController::auth_cb, this,
+                // std::placeholders::_1, std::placeholders::_2));
                 cookie = std::vector<uint8_t>(status_cookie.second.begin(),
                                               status_cookie.second.end());
                 clientNonce = std::vector<uint8_t>(TOR_NONCE_SIZE, 0);
                 GetRandBytes(&clientNonce[0], TOR_NONCE_SIZE);
                 _conn.Command("AUTHCHALLENGE SAFECOOKIE " + HexStr(clientNonce),
-                              boost::bind(&TorController::authchallenge_cb,
-                                          this, _1, _2));
+                              std::bind(&TorController::authchallenge_cb, this,
+                                        std::placeholders::_1,
+                                        std::placeholders::_2));
             } else {
                 if (status_cookie.first) {
                     LogPrintf("tor: Authentication cookie %s is not exactly %i "
                               "bytes, as is required by the spec\n",
                               cookiefile, TOR_COOKIE_SIZE);
                 } else {
                     LogPrintf("tor: Authentication cookie %s could not be "
                               "opened (check permissions)\n",
                               cookiefile);
                 }
             }
         } else if (methods.count("HASHEDPASSWORD")) {
             LogPrintf("tor: The only supported authentication mechanism left "
                       "is password, but no password provided with "
                       "-torpassword\n");
         } else {
             LogPrintf("tor: No supported authentication method\n");
         }
     } else {
         LogPrintf("tor: Requesting protocol info failed\n");
     }
 }
 
 void TorController::connected_cb(TorControlConnection &_conn) {
     reconnect_timeout = RECONNECT_TIMEOUT_START;
     // First send a PROTOCOLINFO command to figure out what authentication is
     // expected
-    if (!_conn.Command(
-            "PROTOCOLINFO 1",
-            boost::bind(&TorController::protocolinfo_cb, this, _1, _2))) {
+    if (!_conn.Command("PROTOCOLINFO 1",
+                       std::bind(&TorController::protocolinfo_cb, this,
+                                 std::placeholders::_1,
+                                 std::placeholders::_2))) {
         LogPrintf("tor: Error sending initial protocolinfo command\n");
     }
 }
 
 void TorController::disconnected_cb(TorControlConnection &_conn) {
     // Stop advertising service when disconnected
     if (service.IsValid()) {
         RemoveLocal(service);
     }
     service = CService();
     if (!reconnect) {
         return;
     }
 
     LogPrint(BCLog::TOR,
              "tor: Not connected to Tor control port %s, trying to reconnect\n",
              target);
 
     // Single-shot timer for reconnect. Use exponential backoff.
     struct timeval time = MillisToTimeval(int64_t(reconnect_timeout * 1000.0));
     if (reconnect_ev) {
         event_add(reconnect_ev, &time);
     }
     reconnect_timeout *= RECONNECT_TIMEOUT_EXP;
 }
 
 void TorController::Reconnect() {
     /* Try to reconnect and reestablish if we get booted - for example, Tor may
      * be restarting.
      */
     if (!conn.Connect(target,
-                      boost::bind(&TorController::connected_cb, this, _1),
-                      boost::bind(&TorController::disconnected_cb, this, _1))) {
+                      std::bind(&TorController::connected_cb, this,
+                                std::placeholders::_1),
+                      std::bind(&TorController::disconnected_cb, this,
+                                std::placeholders::_1))) {
         LogPrintf(
             "tor: Re-initiating connection to Tor control port %s failed\n",
             target);
     }
 }
 
 fs::path TorController::GetPrivateKeyFile() {
     return GetDataDir() / "onion_private_key";
 }
 
 void TorController::reconnect_cb(evutil_socket_t fd, short what, void *arg) {
     TorController *self = static_cast<TorController *>(arg);
     self->Reconnect();
 }
 
 /****** Thread ********/
 static struct event_base *gBase;
 static std::thread torControlThread;
 
 static void TorControlThread() {
     TorController ctrl(gBase, gArgs.GetArg("-torcontrol", DEFAULT_TOR_CONTROL));
 
     event_base_dispatch(gBase);
 }
 
 void StartTorControl() {
     assert(!gBase);
 #ifdef WIN32
     evthread_use_windows_threads();
 #else
     evthread_use_pthreads();
 #endif
     gBase = event_base_new();
     if (!gBase) {
         LogPrintf("tor: Unable to create event_base\n");
         return;
     }
 
     torControlThread = std::thread(
         std::bind(&TraceThread<void (*)()>, "torcontrol", &TorControlThread));
 }
 
 void InterruptTorControl() {
     if (gBase) {
         LogPrintf("tor: Thread interrupt\n");
         event_base_loopbreak(gBase);
     }
 }
 
 void StopTorControl() {
     if (gBase) {
         torControlThread.join();
         event_base_free(gBase);
         gBase = nullptr;
     }
 }
diff --git a/src/validation.cpp b/src/validation.cpp
index 09cb2155e..7025d0bba 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -1,5738 +1,5739 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2016 The Bitcoin Core developers
 // Copyright (c) 2017-2018 The Bitcoin developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <validation.h>
 
 #include <arith_uint256.h>
 #include <blockindexworkcomparator.h>
 #include <blockvalidity.h>
 #include <chainparams.h>
 #include <checkpoints.h>
 #include <checkqueue.h>
 #include <config.h>
 #include <consensus/activation.h>
 #include <consensus/consensus.h>
 #include <consensus/merkle.h>
 #include <consensus/tx_verify.h>
 #include <consensus/validation.h>
 #include <flatfile.h>
 #include <fs.h>
 #include <hash.h>
 #include <index/txindex.h>
 #include <init.h>
 #include <policy/fees.h>
 #include <policy/policy.h>
 #include <pow.h>
 #include <primitives/block.h>
 #include <primitives/transaction.h>
 #include <random.h>
 #include <reverse_iterator.h>
 #include <script/script.h>
 #include <script/scriptcache.h>
 #include <script/sigcache.h>
 #include <script/standard.h>
 #include <timedata.h>
 #include <tinyformat.h>
 #include <txdb.h>
 #include <txmempool.h>
 #include <ui_interface.h>
 #include <undo.h>
 #include <util/moneystr.h>
 #include <util/strencodings.h>
 #include <util/system.h>
 #include <validationinterface.h>
 #include <warnings.h>
 
 #include <boost/algorithm/string/replace.hpp>
 #include <boost/thread.hpp> // boost::this_thread::interruption_point() (mingw)
 
 #include <atomic>
 #include <future>
 #include <sstream>
 #include <thread>
 
 #define MICRO 0.000001
 #define MILLI 0.001
 class ConnectTrace;
 
 /**
  * CChainState stores and provides an API to update our local knowledge of the
  * current best chain and header tree.
  *
  * It generally provides access to the current block tree, as well as functions
  * to provide new data, which it will appropriately validate and incorporate in
  * its state as necessary.
  *
  * Eventually, the API here is targeted at being exposed externally as a
  * consumable libconsensus library, so any functions added must only call
  * other class member functions, pure functions in other parts of the consensus
  * library, callbacks via the validation interface, or read/write-to-disk
  * functions (eventually this will also be via callbacks).
  */
 class CChainState {
 private:
     /**
      * The set of all CBlockIndex entries with BLOCK_VALID_TRANSACTIONS (for
      * itself and all ancestors) and as good as our current tip or better.
      * Entries may be failed, though, and pruning nodes may be missing the data
      * for the block.
      */
     std::set<CBlockIndex *, CBlockIndexWorkComparator> setBlockIndexCandidates;
 
     /**
      * the ChainState CriticalSection
      * A lock that must be held when modifying this ChainState - held in
      * ActivateBestChain()
      */
     CCriticalSection m_cs_chainstate;
 
     /**
      * Every received block is assigned a unique and increasing identifier, so
      * we know which one to give priority in case of a fork.
      * Blocks loaded from disk are assigned id 0, so start the counter at 1.
      */
     std::atomic<int32_t> nBlockSequenceId{1};
     /** Decreasing counter (used by subsequent preciousblock calls). */
     int32_t nBlockReverseSequenceId = -1;
     /** chainwork for the last block that preciousblock has been applied to. */
     arith_uint256 nLastPreciousChainwork = 0;
 
     /**
      * In order to efficiently track invalidity of headers, we keep the set of
      * blocks which we tried to connect and found to be invalid here (ie which
      * were set to BLOCK_FAILED_VALID since the last restart). We can then
      * walk this set and check if a new header is a descendant of something in
      * this set, preventing us from having to walk mapBlockIndex when we try
      * to connect a bad block and fail.
      *
      * While this is more complicated than marking everything which descends
      * from an invalid block as invalid at the time we discover it to be
      * invalid, doing so would require walking all of mapBlockIndex to find all
      * descendants. Since this case should be very rare, keeping track of all
      * BLOCK_FAILED_VALID blocks in a set should be just fine and work just as
      * well.
      *
      * Because we already walk mapBlockIndex in height-order at startup, we go
      * ahead and mark descendants of invalid blocks as FAILED_CHILD at that
      * time, instead of putting things in this set.
      */
     std::set<CBlockIndex *> m_failed_blocks;
 
 public:
     CChain chainActive;
     BlockMap mapBlockIndex;
     std::multimap<CBlockIndex *, CBlockIndex *> mapBlocksUnlinked;
     CBlockIndex *pindexBestInvalid = nullptr;
     CBlockIndex *pindexBestParked = nullptr;
 
     bool LoadBlockIndex(const Config &config, CBlockTreeDB &blocktree);
 
     bool ActivateBestChain(
         const Config &config, CValidationState &state,
         std::shared_ptr<const CBlock> pblock = std::shared_ptr<const CBlock>());
 
     bool AcceptBlockHeader(const Config &config, const CBlockHeader &block,
                            CValidationState &state, CBlockIndex **ppindex);
     bool AcceptBlock(const Config &config,
                      const std::shared_ptr<const CBlock> &pblock,
                      CValidationState &state, bool fRequested,
                      const FlatFilePos *dbp, bool *fNewBlock);
 
     // Block (dis)connection on a given view:
     DisconnectResult DisconnectBlock(const CBlock &block,
                                      const CBlockIndex *pindex,
                                      CCoinsViewCache &view);
     bool ConnectBlock(const CBlock &block, CValidationState &state,
                       CBlockIndex *pindex, CCoinsViewCache &view,
                       const CChainParams &params,
                       BlockValidationOptions options, bool fJustCheck = false)
         EXCLUSIVE_LOCKS_REQUIRED(cs_main);
 
     // Block disconnection on our pcoinsTip:
     bool DisconnectTip(const Config &config, CValidationState &state,
                        DisconnectedBlockTransactions *disconnectpool)
         EXCLUSIVE_LOCKS_REQUIRED(cs_main);
 
     // Manual block validity manipulation:
     bool PreciousBlock(const Config &config, CValidationState &state,
                        CBlockIndex *pindex);
     bool UnwindBlock(const Config &config, CValidationState &state,
                      CBlockIndex *pindex, bool invalidate);
     bool ResetBlockFailureFlags(CBlockIndex *pindex);
     template <typename F>
     void UpdateFlagsForBlock(CBlockIndex *pindexBase, CBlockIndex *pindex, F f);
     template <typename F, typename C>
     void UpdateFlags(CBlockIndex *pindex, F f, C fchild)
         EXCLUSIVE_LOCKS_REQUIRED(cs_main);
     template <typename F>
     void UpdateFlags(CBlockIndex *pindex, F f)
         EXCLUSIVE_LOCKS_REQUIRED(cs_main);
     /** Remove parked status from a block and its descendants. */
     bool UnparkBlockImpl(CBlockIndex *pindex, bool fClearChildren);
 
     bool ReplayBlocks(const Consensus::Params &params, CCoinsView *view);
     bool RewindBlockIndex(const Config &config);
     bool LoadGenesisBlock(const CChainParams &chainparams);
 
     void PruneBlockIndexCandidates();
 
     void UnloadBlockIndex();
 
 private:
     bool ActivateBestChainStep(const Config &config, CValidationState &state,
                                CBlockIndex *pindexMostWork,
                                const std::shared_ptr<const CBlock> &pblock,
                                bool &fInvalidFound, ConnectTrace &connectTrace)
         EXCLUSIVE_LOCKS_REQUIRED(cs_main);
     bool ConnectTip(const Config &config, CValidationState &state,
                     CBlockIndex *pindexNew,
                     const std::shared_ptr<const CBlock> &pblock,
                     ConnectTrace &connectTrace,
                     DisconnectedBlockTransactions &disconnectpool)
         EXCLUSIVE_LOCKS_REQUIRED(cs_main);
 
     CBlockIndex *AddToBlockIndex(const CBlockHeader &block)
         EXCLUSIVE_LOCKS_REQUIRED(cs_main);
     /** Create a new block index entry for a given block hash */
     CBlockIndex *InsertBlockIndex(const uint256 &hash);
     void CheckBlockIndex(const Consensus::Params &consensusParams);
 
     void InvalidBlockFound(CBlockIndex *pindex, const CValidationState &state)
         EXCLUSIVE_LOCKS_REQUIRED(cs_main);
     CBlockIndex *FindMostWorkChain() EXCLUSIVE_LOCKS_REQUIRED(cs_main);
     bool ReceivedBlockTransactions(const CBlock &block, CValidationState &state,
                                    CBlockIndex *pindexNew,
                                    const FlatFilePos &pos)
         EXCLUSIVE_LOCKS_REQUIRED(cs_main);
 
     bool RollforwardBlock(const CBlockIndex *pindex, CCoinsViewCache &inputs,
                           const Consensus::Params &params);
 } g_chainstate;
 
 /**
  * Global state
  */
 CCriticalSection cs_main;
 
 BlockMap &mapBlockIndex = g_chainstate.mapBlockIndex;
 CChain &chainActive = g_chainstate.chainActive;
 CBlockIndex *pindexBestHeader = nullptr;
 Mutex g_best_block_mutex;
 std::condition_variable g_best_block_cv;
 uint256 g_best_block;
 int nScriptCheckThreads = 0;
 std::atomic_bool fImporting(false);
 std::atomic_bool fReindex(false);
 bool fHavePruned = false;
 bool fPruneMode = false;
 bool fIsBareMultisigStd = DEFAULT_PERMIT_BAREMULTISIG;
 bool fRequireStandard = true;
 bool fCheckBlockIndex = false;
 bool fCheckpointsEnabled = DEFAULT_CHECKPOINTS_ENABLED;
 size_t nCoinCacheUsage = 5000 * 300;
 uint64_t nPruneTarget = 0;
 int64_t nMaxTipAge = DEFAULT_MAX_TIP_AGE;
 
 uint256 hashAssumeValid;
 arith_uint256 nMinimumChainWork;
 
 CFeeRate minRelayTxFee = CFeeRate(DEFAULT_MIN_RELAY_TX_FEE_PER_KB);
 Amount maxTxFee = DEFAULT_TRANSACTION_MAXFEE;
 
 CTxMemPool g_mempool;
 std::atomic_bool g_is_mempool_loaded{false};
 
 /** Constant stuff for coinbase transactions we create: */
 CScript COINBASE_FLAGS;
 
 const std::string strMessageMagic = "Bitcoin Signed Message:\n";
 
 // Internal stuff
 namespace {
 CBlockIndex *&pindexBestInvalid = g_chainstate.pindexBestInvalid;
 CBlockIndex *&pindexBestParked = g_chainstate.pindexBestParked;
 
 /**
  * The best finalized block.
  * This block cannot be reorged in any way, shape or form.
  */
 CBlockIndex const *pindexFinalized;
 
 /**
  * All pairs A->B, where A (or one of its ancestors) misses transactions, but B
  * has transactions. Pruned nodes may have entries where B is missing data.
  */
 std::multimap<CBlockIndex *, CBlockIndex *> &mapBlocksUnlinked =
     g_chainstate.mapBlocksUnlinked;
 
 CCriticalSection cs_LastBlockFile;
 std::vector<CBlockFileInfo> vinfoBlockFile;
 int nLastBlockFile = 0;
 /**
  * Global flag to indicate we should check to see if there are block/undo files
  * that should be deleted. Set on startup or if we allocate more file space when
  * we're in prune mode.
  */
 bool fCheckForPruning = false;
 
 /** Dirty block index entries. */
 std::set<const CBlockIndex *> setDirtyBlockIndex;
 
 /** Dirty block file entries. */
 std::set<int> setDirtyFileInfo;
 } // namespace
 
 BlockValidationOptions::BlockValidationOptions(const Config &config)
     : checkPoW(true), checkMerkleRoot(true),
       excessiveBlockSize(config.GetMaxBlockSize()) {}
 
 CBlockIndex *FindForkInGlobalIndex(const CChain &chain,
                                    const CBlockLocator &locator) {
     AssertLockHeld(cs_main);
 
     // Find the first block the caller has in the main chain
     for (const uint256 &hash : locator.vHave) {
         CBlockIndex *pindex = LookupBlockIndex(hash);
         if (pindex) {
             if (chain.Contains(pindex)) {
                 return pindex;
             }
             if (pindex->GetAncestor(chain.Height()) == chain.Tip()) {
                 return chain.Tip();
             }
         }
     }
     return chain.Genesis();
 }
 
 std::unique_ptr<CCoinsViewDB> pcoinsdbview;
 std::unique_ptr<CCoinsViewCache> pcoinsTip;
 std::unique_ptr<CBlockTreeDB> pblocktree;
 
 enum class FlushStateMode { NONE, IF_NEEDED, PERIODIC, ALWAYS };
 
 // See definition for documentation
 static bool FlushStateToDisk(const CChainParams &chainParams,
                              CValidationState &state, FlushStateMode mode,
                              int nManualPruneHeight = 0);
 static void FindFilesToPruneManual(std::set<int> &setFilesToPrune,
                                    int nManualPruneHeight);
 static void FindFilesToPrune(std::set<int> &setFilesToPrune,
                              uint64_t nPruneAfterHeight);
 static FILE *OpenUndoFile(const FlatFilePos &pos, bool fReadOnly = false);
 static FlatFileSeq BlockFileSeq();
 static FlatFileSeq UndoFileSeq();
 static uint32_t GetNextBlockScriptFlags(const Consensus::Params &params,
                                         const CBlockIndex *pindex);
 
 bool TestLockPointValidity(const LockPoints *lp) {
     AssertLockHeld(cs_main);
     assert(lp);
     // If there are relative lock times then the maxInputBlock will be set
     // If there are no relative lock times, the LockPoints don't depend on the
     // chain
     if (lp->maxInputBlock) {
         // Check whether chainActive is an extension of the block at which the
         // LockPoints calculation was valid. If not LockPoints are no longer
         // valid.
         if (!chainActive.Contains(lp->maxInputBlock)) {
             return false;
         }
     }
 
     // LockPoints still valid
     return true;
 }
 
 bool CheckSequenceLocks(const CTransaction &tx, int flags, LockPoints *lp,
                         bool useExistingLockPoints) {
     AssertLockHeld(cs_main);
     AssertLockHeld(g_mempool.cs);
 
     CBlockIndex *tip = chainActive.Tip();
     assert(tip != nullptr);
 
     CBlockIndex index;
     index.pprev = tip;
     // CheckSequenceLocks() uses chainActive.Height()+1 to evaluate height based
     // locks because when SequenceLocks() is called within ConnectBlock(), the
     // height of the block *being* evaluated is what is used. Thus if we want to
     // know if a transaction can be part of the *next* block, we need to use one
     // more than chainActive.Height()
     index.nHeight = tip->nHeight + 1;
 
     std::pair<int, int64_t> lockPair;
     if (useExistingLockPoints) {
         assert(lp);
         lockPair.first = lp->height;
         lockPair.second = lp->time;
     } else {
         // pcoinsTip contains the UTXO set for chainActive.Tip()
         CCoinsViewMemPool viewMemPool(pcoinsTip.get(), g_mempool);
         std::vector<int> prevheights;
         prevheights.resize(tx.vin.size());
         for (size_t txinIndex = 0; txinIndex < tx.vin.size(); txinIndex++) {
             const CTxIn &txin = tx.vin[txinIndex];
             Coin coin;
             if (!viewMemPool.GetCoin(txin.prevout, coin)) {
                 return error("%s: Missing input", __func__);
             }
             if (coin.GetHeight() == MEMPOOL_HEIGHT) {
                 // Assume all mempool transaction confirm in the next block
                 prevheights[txinIndex] = tip->nHeight + 1;
             } else {
                 prevheights[txinIndex] = coin.GetHeight();
             }
         }
         lockPair = CalculateSequenceLocks(tx, flags, &prevheights, index);
         if (lp) {
             lp->height = lockPair.first;
             lp->time = lockPair.second;
             // Also store the hash of the block with the highest height of all
             // the blocks which have sequence locked prevouts. This hash needs
             // to still be on the chain for these LockPoint calculations to be
             // valid.
             // Note: It is impossible to correctly calculate a maxInputBlock if
             // any of the sequence locked inputs depend on unconfirmed txs,
             // except in the special case where the relative lock time/height is
             // 0, which is equivalent to no sequence lock. Since we assume input
             // height of tip+1 for mempool txs and test the resulting lockPair
             // from CalculateSequenceLocks against tip+1. We know
             // EvaluateSequenceLocks will fail if there was a non-zero sequence
             // lock on a mempool input, so we can use the return value of
             // CheckSequenceLocks to indicate the LockPoints validity.
             int maxInputHeight = 0;
             for (int height : prevheights) {
                 // Can ignore mempool inputs since we'll fail if they had
                 // non-zero locks.
                 if (height != tip->nHeight + 1) {
                     maxInputHeight = std::max(maxInputHeight, height);
                 }
             }
             lp->maxInputBlock = tip->GetAncestor(maxInputHeight);
         }
     }
     return EvaluateSequenceLocks(index, lockPair);
 }
 
 /** Convert CValidationState to a human-readable message for logging */
 std::string FormatStateMessage(const CValidationState &state) {
     return strprintf(
         "%s%s (code %i)", state.GetRejectReason(),
         state.GetDebugMessage().empty() ? "" : ", " + state.GetDebugMessage(),
         state.GetRejectCode());
 }
 
 static bool
 IsMagneticAnomalyEnabledForCurrentBlock(const Consensus::Params &params)
     EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
     AssertLockHeld(cs_main);
     return IsMagneticAnomalyEnabled(params, chainActive.Tip());
 }
 
 static bool IsGravitonEnabledForCurrentBlock(const Consensus::Params &params)
     EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
     AssertLockHeld(cs_main);
     return IsGravitonEnabled(params, chainActive.Tip());
 }
 
 // Command-line argument "-replayprotectionactivationtime=<timestamp>" will
 // cause the node to switch to replay protected SigHash ForkID value when the
 // median timestamp of the previous 11 blocks is greater than or equal to
 // <timestamp>. Defaults to the pre-defined timestamp when not set.
 static bool IsReplayProtectionEnabled(const Consensus::Params &params,
                                       int64_t nMedianTimePast) {
     return nMedianTimePast >= gArgs.GetArg("-replayprotectionactivationtime",
                                            params.phononActivationTime);
 }
 
 static bool IsReplayProtectionEnabled(const Consensus::Params &params,
                                       const CBlockIndex *pindexPrev) {
     if (pindexPrev == nullptr) {
         return false;
     }
 
     return IsReplayProtectionEnabled(params, pindexPrev->GetMedianTimePast());
 }
 
 static bool
 IsReplayProtectionEnabledForCurrentBlock(const Consensus::Params &params)
     EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
     AssertLockHeld(cs_main);
     return IsReplayProtectionEnabled(params, chainActive.Tip());
 }
 
 // Used to avoid mempool polluting consensus critical paths if CCoinsViewMempool
 // were somehow broken and returning the wrong scriptPubKeys
 static bool CheckInputsFromMempoolAndCache(
     const CTransaction &tx, CValidationState &state,
     const CCoinsViewCache &view, const CTxMemPool &pool, const uint32_t flags,
     bool cacheSigStore, PrecomputedTransactionData &txdata)
     EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
     AssertLockHeld(cs_main);
 
     // pool.cs should be locked already, but go ahead and re-take the lock here
     // to enforce that mempool doesn't change between when we check the view and
     // when we actually call through to CheckInputs
     LOCK(pool.cs);
 
     assert(!tx.IsCoinBase());
     for (const CTxIn &txin : tx.vin) {
         const Coin &coin = view.AccessCoin(txin.prevout);
 
         // At this point we haven't actually checked if the coins are all
         // available (or shouldn't assume we have, since CheckInputs does). So
         // we just return failure if the inputs are not available here, and then
         // only have to check equivalence for available inputs.
         if (coin.IsSpent()) {
             return false;
         }
 
         const CTransactionRef &txFrom = pool.get(txin.prevout.GetTxId());
         if (txFrom) {
             assert(txFrom->GetId() == txin.prevout.GetTxId());
             assert(txFrom->vout.size() > txin.prevout.GetN());
             assert(txFrom->vout[txin.prevout.GetN()] == coin.GetTxOut());
         } else {
             const Coin &coinFromDisk = pcoinsTip->AccessCoin(txin.prevout);
             assert(!coinFromDisk.IsSpent());
             assert(coinFromDisk.GetTxOut() == coin.GetTxOut());
         }
     }
 
     return CheckInputs(tx, state, view, true, flags, cacheSigStore, true,
                        txdata);
 }
 
 static bool AcceptToMemoryPoolWorker(
     const Config &config, CTxMemPool &pool, CValidationState &state,
     const CTransactionRef &ptx, bool fLimitFree, bool *pfMissingInputs,
     int64_t nAcceptTime, bool fOverrideMempoolLimit, const Amount nAbsurdFee,
     std::vector<COutPoint> &coins_to_uncache, bool test_accept)
     EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
     AssertLockHeld(cs_main);
 
     const Consensus::Params &consensusParams =
         config.GetChainParams().GetConsensus();
 
     const CTransaction &tx = *ptx;
     const TxId txid = tx.GetId();
 
     // mempool "read lock" (held through
     // GetMainSignals().TransactionAddedToMempool())
     LOCK(pool.cs);
     if (pfMissingInputs) {
         *pfMissingInputs = false;
     }
 
     // Coinbase is only valid in a block, not as a loose transaction.
     if (!CheckRegularTransaction(tx, state)) {
         // state filled in by CheckRegularTransaction.
         return false;
     }
 
     // Rather not work on nonstandard transactions (unless -testnet/-regtest)
     std::string reason;
     if (fRequireStandard && !IsStandardTx(tx, reason)) {
         return state.DoS(0, false, REJECT_NONSTANDARD, reason);
     }
 
     // Only accept nLockTime-using transactions that can be mined in the next
     // block; we don't want our mempool filled up with transactions that can't
     // be mined yet.
     CValidationState ctxState;
     if (!ContextualCheckTransactionForCurrentBlock(
             consensusParams, tx, ctxState, STANDARD_LOCKTIME_VERIFY_FLAGS)) {
         // We copy the state from a dummy to ensure we don't increase the
         // ban score of peer for transaction that could be valid in the future.
         return state.DoS(
             0, false, REJECT_NONSTANDARD, ctxState.GetRejectReason(),
             ctxState.CorruptionPossible(), ctxState.GetDebugMessage());
     }
 
     // Is it already in the memory pool?
     if (pool.exists(txid)) {
         return state.Invalid(false, REJECT_DUPLICATE, "txn-already-in-mempool");
     }
 
     // Check for conflicts with in-memory transactions
     for (const CTxIn &txin : tx.vin) {
         auto itConflicting = pool.mapNextTx.find(txin.prevout);
         if (itConflicting != pool.mapNextTx.end()) {
             // Disable replacement feature for good
             return state.Invalid(false, REJECT_DUPLICATE,
                                  "txn-mempool-conflict");
         }
     }
 
     {
         CCoinsView dummy;
         CCoinsViewCache view(&dummy);
 
         LockPoints lp;
         CCoinsViewMemPool viewMemPool(pcoinsTip.get(), pool);
         view.SetBackend(viewMemPool);
 
         // Do all inputs exist?
         for (const CTxIn &txin : tx.vin) {
             if (!pcoinsTip->HaveCoinInCache(txin.prevout)) {
                 coins_to_uncache.push_back(txin.prevout);
             }
 
             if (!view.HaveCoin(txin.prevout)) {
                 // Are inputs missing because we already have the tx?
                 for (size_t out = 0; out < tx.vout.size(); out++) {
                     // Optimistically just do efficient check of cache for
                     // outputs.
                     if (pcoinsTip->HaveCoinInCache(COutPoint(txid, out))) {
                         return state.Invalid(false, REJECT_DUPLICATE,
                                              "txn-already-known");
                     }
                 }
 
                 // Otherwise assume this might be an orphan tx for which we just
                 // haven't seen parents yet.
                 if (pfMissingInputs) {
                     *pfMissingInputs = true;
                 }
 
                 // fMissingInputs and !state.IsInvalid() is used to detect this
                 // condition, don't set state.Invalid()
                 return false;
             }
         }
 
         // Are the actual inputs available?
         if (!view.HaveInputs(tx)) {
             return state.Invalid(false, REJECT_DUPLICATE,
                                  "bad-txns-inputs-spent");
         }
 
         // Bring the best block into scope.
         view.GetBestBlock();
 
         // We have all inputs cached now, so switch back to dummy, so we don't
         // need to keep lock on mempool.
         view.SetBackend(dummy);
 
         // Only accept BIP68 sequence locked transactions that can be mined in
         // the next block; we don't want our mempool filled up with transactions
         // that can't be mined yet. Must keep pool.cs for this unless we change
         // CheckSequenceLocks to take a CoinsViewCache instead of create its
         // own.
         if (!CheckSequenceLocks(tx, STANDARD_LOCKTIME_VERIFY_FLAGS, &lp)) {
             return state.DoS(0, false, REJECT_NONSTANDARD, "non-BIP68-final");
         }
 
         Amount nFees = Amount::zero();
         if (!Consensus::CheckTxInputs(tx, state, view, GetSpendHeight(view),
                                       nFees)) {
             return error("%s: Consensus::CheckTxInputs: %s, %s", __func__,
                          tx.GetId().ToString(), FormatStateMessage(state));
         }
 
         // Check for non-standard pay-to-script-hash in inputs
         if (fRequireStandard && !AreInputsStandard(tx, view)) {
             return state.Invalid(false, REJECT_NONSTANDARD,
                                  "bad-txns-nonstandard-inputs");
         }
 
         int64_t nSigOpsCount =
             GetTransactionSigOpCount(tx, view, STANDARD_SCRIPT_VERIFY_FLAGS);
 
         // nModifiedFees includes any fee deltas from PrioritiseTransaction
         Amount nModifiedFees = nFees;
         double nPriorityDummy = 0;
         pool.ApplyDeltas(txid, nPriorityDummy, nModifiedFees);
 
         Amount inChainInputValue;
         double dPriority =
             view.GetPriority(tx, chainActive.Height(), inChainInputValue);
 
         // Keep track of transactions that spend a coinbase, which we re-scan
         // during reorgs to ensure COINBASE_MATURITY is still met.
         bool fSpendsCoinbase = false;
         for (const CTxIn &txin : tx.vin) {
             const Coin &coin = view.AccessCoin(txin.prevout);
             if (coin.IsCoinBase()) {
                 fSpendsCoinbase = true;
                 break;
             }
         }
 
         CTxMemPoolEntry entry(ptx, nFees, nAcceptTime, dPriority,
                               chainActive.Height(), inChainInputValue,
                               fSpendsCoinbase, nSigOpsCount, lp);
         unsigned int nSize = entry.GetTxSize();
 
         // Check that the transaction doesn't have an excessive number of
         // sigops, making it impossible to mine. Since the coinbase transaction
         // itself can contain sigops MAX_STANDARD_TX_SIGOPS is less than
         // MAX_BLOCK_SIGOPS_PER_MB; we still consider this an invalid rather
         // than merely non-standard transaction.
         if (nSigOpsCount > MAX_STANDARD_TX_SIGOPS) {
             return state.DoS(0, false, REJECT_NONSTANDARD,
                              "bad-txns-too-many-sigops", false,
                              strprintf("%d", nSigOpsCount));
         }
 
         Amount mempoolRejectFee =
             pool.GetMinFee(
                     gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) *
                     1000000)
                 .GetFee(nSize);
         if (mempoolRejectFee > Amount::zero() &&
             nModifiedFees < mempoolRejectFee) {
             return state.DoS(
                 0, false, REJECT_INSUFFICIENTFEE, "mempool min fee not met",
                 false, strprintf("%d < %d", nModifiedFees, mempoolRejectFee));
         }
 
         if (gArgs.GetBoolArg("-relaypriority", DEFAULT_RELAYPRIORITY) &&
             nModifiedFees < minRelayTxFee.GetFee(nSize) &&
             !AllowFree(entry.GetPriority(chainActive.Height() + 1))) {
             // Require that free transactions have sufficient priority to be
             // mined in the next block.
             return state.DoS(0, false, REJECT_INSUFFICIENTFEE,
                              "insufficient priority");
         }
 
         // Continuously rate-limit free (really, very-low-fee) transactions.
         // This mitigates 'penny-flooding' -- sending thousands of free
         // transactions just to be annoying or make others' transactions take
         // longer to confirm.
         if (fLimitFree && nModifiedFees < minRelayTxFee.GetFee(nSize)) {
             static CCriticalSection csFreeLimiter;
             static double dFreeCount;
             static int64_t nLastTime;
             int64_t nNow = GetTime();
 
             LOCK(csFreeLimiter);
 
             // Use an exponentially decaying ~10-minute window:
             dFreeCount *= pow(1.0 - 1.0 / 600.0, double(nNow - nLastTime));
             nLastTime = nNow;
             // -limitfreerelay unit is thousand-bytes-per-minute
             // At default rate it would take over a month to fill 1GB
 
             // NOTE: Use the actual size here, and not the fee size since this
             // is counting real size for the rate limiter.
             if (dFreeCount + nSize >=
                 gArgs.GetArg("-limitfreerelay", DEFAULT_LIMITFREERELAY) * 10 *
                     1000) {
                 return state.DoS(0, false, REJECT_INSUFFICIENTFEE,
                                  "rate limited free transaction");
             }
 
             LogPrint(BCLog::MEMPOOL, "Rate limit dFreeCount: %g => %g\n",
                      dFreeCount, dFreeCount + nSize);
             dFreeCount += nSize;
         }
 
         if (nAbsurdFee != Amount::zero() && nFees > nAbsurdFee) {
             return state.Invalid(false, REJECT_HIGHFEE, "absurdly-high-fee",
                                  strprintf("%d > %d", nFees, nAbsurdFee));
         }
 
         // Calculate in-mempool ancestors, up to a limit.
         CTxMemPool::setEntries setAncestors;
         size_t nLimitAncestors =
             gArgs.GetArg("-limitancestorcount", DEFAULT_ANCESTOR_LIMIT);
         size_t nLimitAncestorSize =
             gArgs.GetArg("-limitancestorsize", DEFAULT_ANCESTOR_SIZE_LIMIT) *
             1000;
         size_t nLimitDescendants =
             gArgs.GetArg("-limitdescendantcount", DEFAULT_DESCENDANT_LIMIT);
         size_t nLimitDescendantSize =
             gArgs.GetArg("-limitdescendantsize",
                          DEFAULT_DESCENDANT_SIZE_LIMIT) *
             1000;
         std::string errString;
         if (!pool.CalculateMemPoolAncestors(
                 entry, setAncestors, nLimitAncestors, nLimitAncestorSize,
                 nLimitDescendants, nLimitDescendantSize, errString)) {
             return state.DoS(0, false, REJECT_NONSTANDARD,
                              "too-long-mempool-chain", false, errString);
         }
 
         // Set extraFlags as a set of flags that needs to be activated.
         uint32_t extraFlags = SCRIPT_VERIFY_NONE;
         if (IsReplayProtectionEnabledForCurrentBlock(consensusParams)) {
             extraFlags |= SCRIPT_ENABLE_REPLAY_PROTECTION;
         }
 
         if (IsMagneticAnomalyEnabledForCurrentBlock(consensusParams)) {
             extraFlags |= SCRIPT_VERIFY_CHECKDATASIG_SIGOPS;
         }
 
         if (IsGravitonEnabledForCurrentBlock(consensusParams)) {
             extraFlags |= SCRIPT_ENABLE_SCHNORR_MULTISIG;
             extraFlags |= SCRIPT_VERIFY_MINIMALDATA;
         }
 
         // Make sure whatever we need to activate is actually activated.
         const uint32_t scriptVerifyFlags =
             STANDARD_SCRIPT_VERIFY_FLAGS | extraFlags;
 
         // Check against previous transactions. This is done last to help
         // prevent CPU exhaustion denial-of-service attacks.
         PrecomputedTransactionData txdata(tx);
         if (!CheckInputs(tx, state, view, true, scriptVerifyFlags, true, false,
                          txdata)) {
             // State filled in by CheckInputs.
             return false;
         }
 
         // Check again against the next block's script verification flags
         // to cache our script execution flags.
         //
         // This is also useful in case of bugs in the standard flags that cause
         // transactions to pass as valid when they're actually invalid. For
         // instance the STRICTENC flag was incorrectly allowing certain CHECKSIG
         // NOT scripts to pass, even though they were invalid.
         //
         // There is a similar check in CreateNewBlock() to prevent creating
         // invalid blocks (using TestBlockValidity), however allowing such
         // transactions into the mempool can be exploited as a DoS attack.
         uint32_t nextBlockScriptVerifyFlags =
             GetNextBlockScriptFlags(consensusParams, chainActive.Tip());
 
         if (!CheckInputsFromMempoolAndCache(tx, state, view, pool,
                                             nextBlockScriptVerifyFlags, true,
                                             txdata)) {
             return error("%s: BUG! PLEASE REPORT THIS! CheckInputs failed "
                          "against next-block but not STANDARD flags %s, %s",
                          __func__, txid.ToString(), FormatStateMessage(state));
         }
 
         if (test_accept) {
             // Tx was accepted, but not added
             return true;
         }
 
         // Store transaction in memory.
         pool.addUnchecked(txid, entry, setAncestors);
 
         // Trim mempool and check if tx was trimmed.
         if (!fOverrideMempoolLimit) {
             pool.LimitSize(
                 gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000,
                 gArgs.GetArg("-mempoolexpiry", DEFAULT_MEMPOOL_EXPIRY) * 60 *
                     60);
             if (!pool.exists(txid)) {
                 return state.DoS(0, false, REJECT_INSUFFICIENTFEE,
                                  "mempool full");
             }
         }
     }
 
     GetMainSignals().TransactionAddedToMempool(ptx);
     return true;
 }
 
 /**
  * (try to) add transaction to memory pool with a specified acceptance time.
  */
 static bool AcceptToMemoryPoolWithTime(
     const Config &config, CTxMemPool &pool, CValidationState &state,
     const CTransactionRef &tx, bool fLimitFree, bool *pfMissingInputs,
     int64_t nAcceptTime, bool fOverrideMempoolLimit, const Amount nAbsurdFee,
     bool test_accept) EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
     std::vector<COutPoint> coins_to_uncache;
     bool res = AcceptToMemoryPoolWorker(
         config, pool, state, tx, fLimitFree, pfMissingInputs, nAcceptTime,
         fOverrideMempoolLimit, nAbsurdFee, coins_to_uncache, test_accept);
     if (!res) {
         for (const COutPoint &outpoint : coins_to_uncache) {
             pcoinsTip->Uncache(outpoint);
         }
     }
 
     // After we've (potentially) uncached entries, ensure our coins cache is
     // still within its size limits
     CValidationState stateDummy;
     FlushStateToDisk(config.GetChainParams(), stateDummy,
                      FlushStateMode::PERIODIC);
     return res;
 }
 
 bool AcceptToMemoryPool(const Config &config, CTxMemPool &pool,
                         CValidationState &state, const CTransactionRef &tx,
                         bool fLimitFree, bool *pfMissingInputs,
                         bool fOverrideMempoolLimit, const Amount nAbsurdFee,
                         bool test_accept) {
     return AcceptToMemoryPoolWithTime(
         config, pool, state, tx, fLimitFree, pfMissingInputs, GetTime(),
         fOverrideMempoolLimit, nAbsurdFee, test_accept);
 }
 
 /**
  * Return transaction in txOut, and if it was found inside a block, its hash is
  * placed in hashBlock. If blockIndex is provided, the transaction is fetched
  * from the corresponding block.
  */
 bool GetTransaction(const Consensus::Params &params, const TxId &txid,
                     CTransactionRef &txOut, uint256 &hashBlock, bool fAllowSlow,
                     CBlockIndex *blockIndex) {
     CBlockIndex *pindexSlow = blockIndex;
 
     LOCK(cs_main);
 
     if (!blockIndex) {
         CTransactionRef ptx = g_mempool.get(txid);
         if (ptx) {
             txOut = ptx;
             return true;
         }
 
         if (g_txindex) {
             return g_txindex->FindTx(txid, hashBlock, txOut);
         }
 
         // use coin database to locate block that contains transaction, and scan
         // it
         if (fAllowSlow) {
             const Coin &coin = AccessByTxid(*pcoinsTip, txid);
             if (!coin.IsSpent()) {
                 pindexSlow = chainActive[coin.GetHeight()];
             }
         }
     }
 
     if (pindexSlow) {
         CBlock block;
         if (ReadBlockFromDisk(block, pindexSlow, params)) {
             for (const auto &tx : block.vtx) {
                 if (tx->GetId() == txid) {
                     txOut = tx;
                     hashBlock = pindexSlow->GetBlockHash();
                     return true;
                 }
             }
         }
     }
 
     return false;
 }
 
 //////////////////////////////////////////////////////////////////////////////
 //
 // CBlock and CBlockIndex
 //
 
 static bool WriteBlockToDisk(const CBlock &block, FlatFilePos &pos,
                              const CMessageHeader::MessageMagic &messageStart) {
     // Open history file to append
     CAutoFile fileout(OpenBlockFile(pos), SER_DISK, CLIENT_VERSION);
     if (fileout.IsNull()) {
         return error("WriteBlockToDisk: OpenBlockFile failed");
     }
 
     // Write index header
     unsigned int nSize = GetSerializeSize(fileout, block);
     fileout << FLATDATA(messageStart) << nSize;
 
     // Write block
     long fileOutPos = ftell(fileout.Get());
     if (fileOutPos < 0) {
         return error("WriteBlockToDisk: ftell failed");
     }
 
     pos.nPos = (unsigned int)fileOutPos;
     fileout << block;
 
     return true;
 }
 
 bool ReadBlockFromDisk(CBlock &block, const FlatFilePos &pos,
                        const Consensus::Params &params) {
     block.SetNull();
 
     // Open history file to read
     CAutoFile filein(OpenBlockFile(pos, true), SER_DISK, CLIENT_VERSION);
     if (filein.IsNull()) {
         return error("ReadBlockFromDisk: OpenBlockFile failed for %s",
                      pos.ToString());
     }
 
     // Read block
     try {
         filein >> block;
     } catch (const std::exception &e) {
         return error("%s: Deserialize or I/O error - %s at %s", __func__,
                      e.what(), pos.ToString());
     }
 
     // Check the header
     if (!CheckProofOfWork(block.GetHash(), block.nBits, params)) {
         return error("ReadBlockFromDisk: Errors in block header at %s",
                      pos.ToString());
     }
 
     return true;
 }
 
 bool ReadBlockFromDisk(CBlock &block, const CBlockIndex *pindex,
                        const Consensus::Params &params) {
     FlatFilePos blockPos;
     {
         LOCK(cs_main);
         blockPos = pindex->GetBlockPos();
     }
 
     if (!ReadBlockFromDisk(block, blockPos, params)) {
         return false;
     }
 
     if (block.GetHash() != pindex->GetBlockHash()) {
         return error("ReadBlockFromDisk(CBlock&, CBlockIndex*): GetHash() "
                      "doesn't match index for %s at %s",
                      pindex->ToString(), pindex->GetBlockPos().ToString());
     }
 
     return true;
 }
 
 Amount GetBlockSubsidy(int nHeight, const Consensus::Params &consensusParams) {
     int halvings = nHeight / consensusParams.nSubsidyHalvingInterval;
     // Force block reward to zero when right shift is undefined.
     if (halvings >= 64) {
         return Amount::zero();
     }
 
     Amount nSubsidy = 50 * COIN;
     // Subsidy is cut in half every 210,000 blocks which will occur
     // approximately every 4 years.
     return ((nSubsidy / SATOSHI) >> halvings) * SATOSHI;
 }
 
 bool IsInitialBlockDownload() {
     // Once this function has returned false, it must remain false.
     static std::atomic<bool> latchToFalse{false};
     // Optimization: pre-test latch before taking the lock.
     if (latchToFalse.load(std::memory_order_relaxed)) {
         return false;
     }
 
     LOCK(cs_main);
     if (latchToFalse.load(std::memory_order_relaxed)) {
         return false;
     }
     if (fImporting || fReindex) {
         return true;
     }
     if (chainActive.Tip() == nullptr) {
         return true;
     }
     if (chainActive.Tip()->nChainWork < nMinimumChainWork) {
         return true;
     }
     if (chainActive.Tip()->GetBlockTime() < (GetTime() - nMaxTipAge)) {
         return true;
     }
     LogPrintf("Leaving InitialBlockDownload (latching to false)\n");
     latchToFalse.store(true, std::memory_order_relaxed);
     return false;
 }
 
 CBlockIndex const *pindexBestForkTip = nullptr;
 CBlockIndex const *pindexBestForkBase = nullptr;
 
 static void AlertNotify(const std::string &strMessage) {
     uiInterface.NotifyAlertChanged();
     std::string strCmd = gArgs.GetArg("-alertnotify", "");
     if (strCmd.empty()) {
         return;
     }
 
     // Alert text should be plain ascii coming from a trusted source, but to be
     // safe we first strip anything not in safeChars, then add single quotes
     // around the whole string before passing it to the shell:
     std::string singleQuote("'");
     std::string safeStatus = SanitizeString(strMessage);
     safeStatus = singleQuote + safeStatus + singleQuote;
     boost::replace_all(strCmd, "%s", safeStatus);
 
     std::thread t(runCommand, strCmd);
     // thread runs free
     t.detach();
 }
 
 static void CheckForkWarningConditions() EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
     AssertLockHeld(cs_main);
     // Before we get past initial download, we cannot reliably alert about forks
     // (we assume we don't get stuck on a fork before finishing our initial
     // sync)
     if (IsInitialBlockDownload()) {
         return;
     }
 
     // If our best fork is no longer within 72 blocks (+/- 12 hours if no one
     // mines it) of our head, drop it
     if (pindexBestForkTip &&
         chainActive.Height() - pindexBestForkTip->nHeight >= 72) {
         pindexBestForkTip = nullptr;
     }
 
     if (pindexBestForkTip ||
         (pindexBestInvalid &&
          pindexBestInvalid->nChainWork >
              chainActive.Tip()->nChainWork +
                  (GetBlockProof(*chainActive.Tip()) * 6))) {
         if (!GetfLargeWorkForkFound() && pindexBestForkBase) {
             std::string warning =
                 std::string("'Warning: Large-work fork detected, forking after "
                             "block ") +
                 pindexBestForkBase->phashBlock->ToString() + std::string("'");
             AlertNotify(warning);
         }
 
         if (pindexBestForkTip && pindexBestForkBase) {
             LogPrintf("%s: Warning: Large fork found\n  forking the "
                       "chain at height %d (%s)\n  lasting to height %d "
                       "(%s).\nChain state database corruption likely.\n",
                       __func__, pindexBestForkBase->nHeight,
                       pindexBestForkBase->phashBlock->ToString(),
                       pindexBestForkTip->nHeight,
                       pindexBestForkTip->phashBlock->ToString());
             SetfLargeWorkForkFound(true);
         } else {
             LogPrintf("%s: Warning: Found invalid chain at least ~6 blocks "
                       "longer than our best chain.\nChain state database "
                       "corruption likely.\n",
                       __func__);
             SetfLargeWorkInvalidChainFound(true);
         }
     } else {
         SetfLargeWorkForkFound(false);
         SetfLargeWorkInvalidChainFound(false);
     }
 }
 
 static void CheckForkWarningConditionsOnNewFork(CBlockIndex *pindexNewForkTip)
     EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
     AssertLockHeld(cs_main);
     // If we are on a fork that is sufficiently large, set a warning flag.
     const CBlockIndex *pfork = chainActive.FindFork(pindexNewForkTip);
 
     // We define a condition where we should warn the user about as a fork of at
     // least 7 blocks with a tip within 72 blocks (+/- 12 hours if no one mines
     // it) of ours. We use 7 blocks rather arbitrarily as it represents just
     // under 10% of sustained network hash rate operating on the fork, or a
     // chain that is entirely longer than ours and invalid (note that this
     // should be detected by both). We define it this way because it allows us
     // to only store the highest fork tip (+ base) which meets the 7-block
     // condition and from this always have the most-likely-to-cause-warning fork
     if (pfork &&
         (!pindexBestForkTip ||
          pindexNewForkTip->nHeight > pindexBestForkTip->nHeight) &&
         pindexNewForkTip->nChainWork - pfork->nChainWork >
             (GetBlockProof(*pfork) * 7) &&
         chainActive.Height() - pindexNewForkTip->nHeight < 72) {
         pindexBestForkTip = pindexNewForkTip;
         pindexBestForkBase = pfork;
     }
 
     CheckForkWarningConditions();
 }
 
 void static InvalidChainFound(CBlockIndex *pindexNew)
     EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
     if (!pindexBestInvalid ||
         pindexNew->nChainWork > pindexBestInvalid->nChainWork) {
         pindexBestInvalid = pindexNew;
     }
 
     // If the invalid chain found is supposed to be finalized, we need to move
     // back the finalization point.
     if (IsBlockFinalized(pindexNew)) {
         pindexFinalized = pindexNew->pprev;
     }
 
     LogPrintf("%s: invalid block=%s  height=%d  log2_work=%.8g  date=%s\n",
               __func__, pindexNew->GetBlockHash().ToString(),
               pindexNew->nHeight,
               log(pindexNew->nChainWork.getdouble()) / log(2.0),
               FormatISO8601DateTime(pindexNew->GetBlockTime()));
     CBlockIndex *tip = chainActive.Tip();
     assert(tip);
     LogPrintf("%s:  current best=%s  height=%d  log2_work=%.8g  date=%s\n",
               __func__, tip->GetBlockHash().ToString(), chainActive.Height(),
               log(tip->nChainWork.getdouble()) / log(2.0),
               FormatISO8601DateTime(tip->GetBlockTime()));
 }
 
 void CChainState::InvalidBlockFound(CBlockIndex *pindex,
                                     const CValidationState &state) {
     if (!state.CorruptionPossible()) {
         pindex->nStatus = pindex->nStatus.withFailed();
         m_failed_blocks.insert(pindex);
         setDirtyBlockIndex.insert(pindex);
         InvalidChainFound(pindex);
     }
 }
 
 void SpendCoins(CCoinsViewCache &view, const CTransaction &tx, CTxUndo &txundo,
                 int nHeight) {
     // Mark inputs spent.
     if (tx.IsCoinBase()) {
         return;
     }
 
     txundo.vprevout.reserve(tx.vin.size());
     for (const CTxIn &txin : tx.vin) {
         txundo.vprevout.emplace_back();
         bool is_spent = view.SpendCoin(txin.prevout, &txundo.vprevout.back());
         assert(is_spent);
     }
 }
 
 void UpdateCoins(CCoinsViewCache &view, const CTransaction &tx, CTxUndo &txundo,
                  int nHeight) {
     SpendCoins(view, tx, txundo, nHeight);
     AddCoins(view, tx, nHeight);
 }
 
 void UpdateCoins(CCoinsViewCache &view, const CTransaction &tx, int nHeight) {
     // Mark inputs spent.
     if (!tx.IsCoinBase()) {
         for (const CTxIn &txin : tx.vin) {
             bool is_spent = view.SpendCoin(txin.prevout);
             assert(is_spent);
         }
     }
 
     // Add outputs.
     AddCoins(view, tx, nHeight);
 }
 
 bool CScriptCheck::operator()() {
     const CScript &scriptSig = ptxTo->vin[nIn].scriptSig;
     return VerifyScript(scriptSig, scriptPubKey, nFlags,
                         CachingTransactionSignatureChecker(ptxTo, nIn, amount,
                                                            cacheStore, txdata),
                         &error);
 }
 
 int GetSpendHeight(const CCoinsViewCache &inputs) {
     LOCK(cs_main);
     CBlockIndex *pindexPrev = LookupBlockIndex(inputs.GetBestBlock());
     return pindexPrev->nHeight + 1;
 }
 
 bool CheckInputs(const CTransaction &tx, CValidationState &state,
                  const CCoinsViewCache &inputs, bool fScriptChecks,
                  const uint32_t flags, bool sigCacheStore,
                  bool scriptCacheStore,
                  const PrecomputedTransactionData &txdata,
                  std::vector<CScriptCheck> *pvChecks)
     EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
     assert(!tx.IsCoinBase());
 
     if (pvChecks) {
         pvChecks->reserve(tx.vin.size());
     }
 
     // Skip script verification when connecting blocks under the assumevalid
     // block. Assuming the assumevalid block is valid this is safe because
     // block merkle hashes are still computed and checked, of course, if an
     // assumed valid block is invalid due to false scriptSigs this optimization
     // would allow an invalid chain to be accepted.
     if (!fScriptChecks) {
         return true;
     }
 
     // First check if script executions have been cached with the same flags.
     // Note that this assumes that the inputs provided are correct (ie that the
     // transaction hash which is in tx's prevouts properly commits to the
     // scriptPubKey in the inputs view of that transaction).
     uint256 hashCacheEntry = GetScriptCacheKey(tx, flags);
     if (IsKeyInScriptCache(hashCacheEntry, !scriptCacheStore)) {
         return true;
     }
 
     for (size_t i = 0; i < tx.vin.size(); i++) {
         const COutPoint &prevout = tx.vin[i].prevout;
         const Coin &coin = inputs.AccessCoin(prevout);
         assert(!coin.IsSpent());
 
         // We very carefully only pass in things to CScriptCheck which are
         // clearly committed to by tx's hash. This provides a sanity
         // check that our caching is not introducing consensus failures through
         // additional data in, eg, the coins being spent being checked as a part
         // of CScriptCheck.
         const CScript &scriptPubKey = coin.GetTxOut().scriptPubKey;
         const Amount amount = coin.GetTxOut().nValue;
 
         // Verify signature
         CScriptCheck check(scriptPubKey, amount, tx, i, flags, sigCacheStore,
                            txdata);
         if (pvChecks) {
             pvChecks->push_back(std::move(check));
         } else if (!check()) {
             ScriptError scriptError = check.GetScriptError();
             // Compute flags without the optional standardness flags.
             // This differs from MANDATORY_SCRIPT_VERIFY_FLAGS as it contains
             // additional upgrade flags (see AcceptToMemoryPoolWorker variable
             // extraFlags).
             uint32_t mandatoryFlags =
                 flags & ~STANDARD_NOT_MANDATORY_VERIFY_FLAGS;
             if (flags != mandatoryFlags) {
                 // Check whether the failure was caused by a non-mandatory
                 // script verification check. If so, don't trigger DoS
                 // protection to avoid splitting the network on the basis of
                 // relay policy disagreements.
                 CScriptCheck check2(scriptPubKey, amount, tx, i, mandatoryFlags,
                                     sigCacheStore, txdata);
                 if (check2()) {
                     return state.Invalid(
                         false, REJECT_NONSTANDARD,
                         strprintf("non-mandatory-script-verify-flag (%s)",
                                   ScriptErrorString(scriptError)));
                 }
                 // update the error message to reflect the mandatory violation.
                 scriptError = check2.GetScriptError();
             }
 
             // Before banning, we need to check whether the transaction would
             // be valid on the other side of the upgrade, so as to avoid
             // splitting the network between upgraded and non-upgraded nodes.
             CScriptCheck check3(scriptPubKey, amount, tx, i,
                                 mandatoryFlags ^ SCRIPT_ENABLE_SCHNORR_MULTISIG,
                                 sigCacheStore, txdata);
             if (check3()) {
                 return state.Invalid(
                     false, REJECT_INVALID,
                     strprintf("upgrade-conditional-script-failure (%s)",
                               ScriptErrorString(scriptError)));
             }
 
             // Failures of other flags indicate a transaction that is invalid in
             // new blocks, e.g. a invalid P2SH. We DoS ban such nodes as they
             // are not following the protocol. That said during an upgrade
             // careful thought should be taken as to the correct behavior - we
             // may want to continue peering with non-upgraded nodes even after
             // soft-fork super-majority signaling has occurred.
             return state.DoS(
                 100, false, REJECT_INVALID,
                 strprintf("mandatory-script-verify-flag-failed (%s)",
                           ScriptErrorString(scriptError)));
         }
     }
 
     if (scriptCacheStore && !pvChecks) {
         // We executed all of the provided scripts, and were told to cache the
         // result. Do so now.
         AddKeyInScriptCache(hashCacheEntry);
     }
 
     return true;
 }
 
 namespace {
 
 bool UndoWriteToDisk(const CBlockUndo &blockundo, FlatFilePos &pos,
                      const uint256 &hashBlock,
                      const CMessageHeader::MessageMagic &messageStart) {
     // Open history file to append
     CAutoFile fileout(OpenUndoFile(pos), SER_DISK, CLIENT_VERSION);
     if (fileout.IsNull()) {
         return error("%s: OpenUndoFile failed", __func__);
     }
 
     // Write index header
     unsigned int nSize = GetSerializeSize(fileout, blockundo);
     fileout << FLATDATA(messageStart) << nSize;
 
     // Write undo data
     long fileOutPos = ftell(fileout.Get());
     if (fileOutPos < 0) {
         return error("%s: ftell failed", __func__);
     }
     pos.nPos = (unsigned int)fileOutPos;
     fileout << blockundo;
 
     // calculate & write checksum
     CHashWriter hasher(SER_GETHASH, PROTOCOL_VERSION);
     hasher << hashBlock;
     hasher << blockundo;
     fileout << hasher.GetHash();
 
     return true;
 }
 
 static bool UndoReadFromDisk(CBlockUndo &blockundo, const CBlockIndex *pindex) {
     FlatFilePos pos = pindex->GetUndoPos();
     if (pos.IsNull()) {
         return error("%s: no undo data available", __func__);
     }
 
     // Open history file to read
     CAutoFile filein(OpenUndoFile(pos, true), SER_DISK, CLIENT_VERSION);
     if (filein.IsNull()) {
         return error("%s: OpenUndoFile failed", __func__);
     }
 
     // Read block
     uint256 hashChecksum;
     // We need a CHashVerifier as reserializing may lose data
     CHashVerifier<CAutoFile> verifier(&filein);
     try {
         verifier << pindex->pprev->GetBlockHash();
         verifier >> blockundo;
         filein >> hashChecksum;
     } catch (const std::exception &e) {
         return error("%s: Deserialize or I/O error - %s", __func__, e.what());
     }
 
     // Verify checksum
     if (hashChecksum != verifier.GetHash()) {
         return error("%s: Checksum mismatch", __func__);
     }
 
     return true;
 }
 
 /** Abort with a message */
 static bool AbortNode(const std::string &strMessage,
                       const std::string &userMessage = "") {
     SetMiscWarning(strMessage);
     LogPrintf("*** %s\n", strMessage);
     uiInterface.ThreadSafeMessageBox(
         userMessage.empty() ? _("Error: A fatal internal error occurred, see "
                                 "debug.log for details")
                             : userMessage,
         "", CClientUIInterface::MSG_ERROR);
     StartShutdown();
     return false;
 }
 
 static bool AbortNode(CValidationState &state, const std::string &strMessage,
                       const std::string &userMessage = "") {
     AbortNode(strMessage, userMessage);
     return state.Error(strMessage);
 }
 
 } // namespace
 
 /** Restore the UTXO in a Coin at a given COutPoint. */
 DisconnectResult UndoCoinSpend(const Coin &undo, CCoinsViewCache &view,
                                const COutPoint &out) {
     bool fClean = true;
 
     if (view.HaveCoin(out)) {
         // Overwriting transaction output.
         fClean = false;
     }
 
     if (undo.GetHeight() == 0) {
         // Missing undo metadata (height and coinbase). Older versions included
         // this information only in undo records for the last spend of a
         // transactions' outputs. This implies that it must be present for some
         // other output of the same tx.
         const Coin &alternate = AccessByTxid(view, out.GetTxId());
         if (alternate.IsSpent()) {
             // Adding output for transaction without known metadata
             return DISCONNECT_FAILED;
         }
 
         // This is somewhat ugly, but hopefully utility is limited. This is only
         // useful when working from legacy on disck data. In any case, putting
         // the correct information in there doesn't hurt.
         const_cast<Coin &>(undo) = Coin(undo.GetTxOut(), alternate.GetHeight(),
                                         alternate.IsCoinBase());
     }
 
     // The potential_overwrite parameter to AddCoin is only allowed to be false
     // if we know for sure that the coin did not already exist in the cache. As
     // we have queried for that above using HaveCoin, we don't need to guess.
     // When fClean is false, a coin already existed and it is an overwrite.
     view.AddCoin(out, std::move(undo), !fClean);
 
     return fClean ? DISCONNECT_OK : DISCONNECT_UNCLEAN;
 }
 
 /**
  * Undo the effects of this block (with given index) on the UTXO set represented
  * by coins. When FAILED is returned, view is left in an indeterminate state.
  */
 DisconnectResult CChainState::DisconnectBlock(const CBlock &block,
                                               const CBlockIndex *pindex,
                                               CCoinsViewCache &view) {
     CBlockUndo blockUndo;
     if (!UndoReadFromDisk(blockUndo, pindex)) {
         error("DisconnectBlock(): failure reading undo data");
         return DISCONNECT_FAILED;
     }
 
     return ApplyBlockUndo(blockUndo, block, pindex, view);
 }
 
 DisconnectResult ApplyBlockUndo(const CBlockUndo &blockUndo,
                                 const CBlock &block, const CBlockIndex *pindex,
                                 CCoinsViewCache &view) {
     bool fClean = true;
 
     if (blockUndo.vtxundo.size() + 1 != block.vtx.size()) {
         error("DisconnectBlock(): block and undo data inconsistent");
         return DISCONNECT_FAILED;
     }
 
     // First, restore inputs.
     for (size_t i = 1; i < block.vtx.size(); i++) {
         const CTransaction &tx = *(block.vtx[i]);
         const CTxUndo &txundo = blockUndo.vtxundo[i - 1];
         if (txundo.vprevout.size() != tx.vin.size()) {
             error("DisconnectBlock(): transaction and undo data inconsistent");
             return DISCONNECT_FAILED;
         }
 
         for (size_t j = 0; j < tx.vin.size(); j++) {
             const COutPoint &out = tx.vin[j].prevout;
             const Coin &undo = txundo.vprevout[j];
             DisconnectResult res = UndoCoinSpend(undo, view, out);
             if (res == DISCONNECT_FAILED) {
                 return DISCONNECT_FAILED;
             }
             fClean = fClean && res != DISCONNECT_UNCLEAN;
         }
     }
 
     // Second, revert created outputs.
     for (const auto &ptx : block.vtx) {
         const CTransaction &tx = *ptx;
         const TxId &txid = tx.GetId();
         const bool is_coinbase = tx.IsCoinBase();
 
         // Check that all outputs are available and match the outputs in the
         // block itself exactly.
         for (size_t o = 0; o < tx.vout.size(); o++) {
             if (tx.vout[o].scriptPubKey.IsUnspendable()) {
                 continue;
             }
 
             COutPoint out(txid, o);
             Coin coin;
             bool is_spent = view.SpendCoin(out, &coin);
             if (!is_spent || tx.vout[o] != coin.GetTxOut() ||
                 uint32_t(pindex->nHeight) != coin.GetHeight() ||
                 is_coinbase != coin.IsCoinBase()) {
                 // transaction output mismatch
                 fClean = false;
             }
         }
     }
 
     // Move best block pointer to previous block.
     view.SetBestBlock(block.hashPrevBlock);
 
     return fClean ? DISCONNECT_OK : DISCONNECT_UNCLEAN;
 }
 
 static void FlushBlockFile(bool fFinalize = false) {
     LOCK(cs_LastBlockFile);
 
     FlatFilePos block_pos_old(nLastBlockFile,
                               vinfoBlockFile[nLastBlockFile].nSize);
     FlatFilePos undo_pos_old(nLastBlockFile,
                              vinfoBlockFile[nLastBlockFile].nUndoSize);
 
     bool status = true;
     status &= BlockFileSeq().Flush(block_pos_old, fFinalize);
     status &= UndoFileSeq().Flush(undo_pos_old, fFinalize);
     if (!status) {
         AbortNode("Flushing block file to disk failed. This is likely the "
                   "result of an I/O error.");
     }
 }
 
 static bool FindUndoPos(CValidationState &state, int nFile, FlatFilePos &pos,
                         unsigned int nAddSize);
 
 static bool WriteUndoDataForBlock(const CBlockUndo &blockundo,
                                   CValidationState &state, CBlockIndex *pindex,
                                   const CChainParams &chainparams) {
     // Write undo information to disk
     if (pindex->GetUndoPos().IsNull()) {
         FlatFilePos _pos;
         if (!FindUndoPos(
                 state, pindex->nFile, _pos,
                 ::GetSerializeSize(blockundo, SER_DISK, CLIENT_VERSION) + 40)) {
             return error("ConnectBlock(): FindUndoPos failed");
         }
         if (!UndoWriteToDisk(blockundo, _pos, pindex->pprev->GetBlockHash(),
                              chainparams.DiskMagic())) {
             return AbortNode(state, "Failed to write undo data");
         }
 
         // update nUndoPos in block index
         pindex->nUndoPos = _pos.nPos;
         pindex->nStatus = pindex->nStatus.withUndo();
         setDirtyBlockIndex.insert(pindex);
     }
 
     return true;
 }
 
 static CCheckQueue<CScriptCheck> scriptcheckqueue(128);
 
 void ThreadScriptCheck() {
     RenameThread("bitcoin-scriptch");
     scriptcheckqueue.Thread();
 }
 
 int32_t ComputeBlockVersion(const CBlockIndex *pindexPrev,
                             const Consensus::Params &params) {
     int32_t nVersion = VERSIONBITS_TOP_BITS;
     return nVersion;
 }
 
 // Returns the script flags which should be checked for the block after
 // the given block.
 static uint32_t GetNextBlockScriptFlags(const Consensus::Params &params,
                                         const CBlockIndex *pindex) {
     uint32_t flags = SCRIPT_VERIFY_NONE;
 
     // Start enforcing P2SH (BIP16)
     if ((pindex->nHeight + 1) >= params.BIP16Height) {
         flags |= SCRIPT_VERIFY_P2SH;
     }
 
     // Start enforcing the DERSIG (BIP66) rule.
     if ((pindex->nHeight + 1) >= params.BIP66Height) {
         flags |= SCRIPT_VERIFY_DERSIG;
     }
 
     // Start enforcing CHECKLOCKTIMEVERIFY (BIP65) rule.
     if ((pindex->nHeight + 1) >= params.BIP65Height) {
         flags |= SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY;
     }
 
     // Start enforcing CSV (BIP68, BIP112 and BIP113) rule.
     if ((pindex->nHeight + 1) >= params.CSVHeight) {
         flags |= SCRIPT_VERIFY_CHECKSEQUENCEVERIFY;
     }
 
     // If the UAHF is enabled, we start accepting replay protected txns
     if (IsUAHFenabled(params, pindex)) {
         flags |= SCRIPT_VERIFY_STRICTENC;
         flags |= SCRIPT_ENABLE_SIGHASH_FORKID;
     }
 
     // If the DAA HF is enabled, we start rejecting transaction that use a high
     // s in their signature. We also make sure that signature that are supposed
     // to fail (for instance in multisig or other forms of smart contracts) are
     // null.
     if (IsDAAEnabled(params, pindex)) {
         flags |= SCRIPT_VERIFY_LOW_S;
         flags |= SCRIPT_VERIFY_NULLFAIL;
     }
 
     // When the magnetic anomaly fork is enabled, we start accepting
     // transactions using the OP_CHECKDATASIG opcode and it's verify
     // alternative. We also start enforcing push only signatures and
     // clean stack.
     if (IsMagneticAnomalyEnabled(params, pindex)) {
         flags |= SCRIPT_VERIFY_CHECKDATASIG_SIGOPS;
         flags |= SCRIPT_VERIFY_SIGPUSHONLY;
         flags |= SCRIPT_VERIFY_CLEANSTACK;
     }
 
     if (IsGravitonEnabled(params, pindex)) {
         flags |= SCRIPT_ENABLE_SCHNORR_MULTISIG;
         flags |= SCRIPT_VERIFY_MINIMALDATA;
     }
 
     // We make sure this node will have replay protection during the next hard
     // fork.
     if (IsReplayProtectionEnabled(params, pindex)) {
         flags |= SCRIPT_ENABLE_REPLAY_PROTECTION;
     }
 
     return flags;
 }
 
 static int64_t nTimeCheck = 0;
 static int64_t nTimeForks = 0;
 static int64_t nTimeVerify = 0;
 static int64_t nTimeConnect = 0;
 static int64_t nTimeIndex = 0;
 static int64_t nTimeCallbacks = 0;
 static int64_t nTimeTotal = 0;
 static int64_t nBlocksTotal = 0;
 
 /**
  * Apply the effects of this block (with given index) on the UTXO set
  * represented by coins. Validity checks that depend on the UTXO set are also
  * done; ConnectBlock() can fail if those validity checks fail (among other
  * reasons).
  */
 bool CChainState::ConnectBlock(const CBlock &block, CValidationState &state,
                                CBlockIndex *pindex, CCoinsViewCache &view,
                                const CChainParams &params,
                                BlockValidationOptions options, bool fJustCheck)
     EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
     AssertLockHeld(cs_main);
     assert(pindex);
     assert(*pindex->phashBlock == block.GetHash());
     int64_t nTimeStart = GetTimeMicros();
 
     const Consensus::Params &consensusParams = params.GetConsensus();
 
     // Check it again in case a previous version let a bad block in
     // NOTE: We don't currently (re-)invoke ContextualCheckBlock() or
     // ContextualCheckBlockHeader() here. This means that if we add a new
     // consensus rule that is enforced in one of those two functions, then we
     // may have let in a block that violates the rule prior to updating the
     // software, and we would NOT be enforcing the rule here. Fully solving
     // upgrade from one software version to the next after a consensus rule
     // change is potentially tricky and issue-specific (see RewindBlockIndex()
     // for one general approach that was used for BIP 141 deployment).
     // Also, currently the rule against blocks more than 2 hours in the future
     // is enforced in ContextualCheckBlockHeader(); we wouldn't want to
     // re-enforce that rule here (at least until we make it impossible for
     // GetAdjustedTime() to go backward).
     if (!CheckBlock(block, state, consensusParams,
                     options.withCheckPoW(!fJustCheck)
                         .withCheckMerkleRoot(!fJustCheck))) {
         if (state.CorruptionPossible()) {
             // We don't write down blocks to disk if they may have been
             // corrupted, so this should be impossible unless we're having
             // hardware problems.
             return AbortNode(state, "Corrupt block found indicating potential "
                                     "hardware failure; shutting down");
         }
         return error("%s: Consensus::CheckBlock: %s", __func__,
                      FormatStateMessage(state));
     }
 
     // Verify that the view's current state corresponds to the previous block
     uint256 hashPrevBlock =
         pindex->pprev == nullptr ? uint256() : pindex->pprev->GetBlockHash();
     assert(hashPrevBlock == view.GetBestBlock());
 
     // Special case for the genesis block, skipping connection of its
     // transactions (its coinbase is unspendable)
     if (block.GetHash() == consensusParams.hashGenesisBlock) {
         if (!fJustCheck) {
             view.SetBestBlock(pindex->GetBlockHash());
         }
 
         return true;
     }
 
     nBlocksTotal++;
 
     bool fScriptChecks = true;
     if (!hashAssumeValid.IsNull()) {
         // We've been configured with the hash of a block which has been
         // externally verified to have a valid history. A suitable default value
         // is included with the software and updated from time to time. Because
         // validity relative to a piece of software is an objective fact these
         // defaults can be easily reviewed. This setting doesn't force the
         // selection of any particular chain but makes validating some faster by
         // effectively caching the result of part of the verification.
         BlockMap::const_iterator it = mapBlockIndex.find(hashAssumeValid);
         if (it != mapBlockIndex.end()) {
             if (it->second->GetAncestor(pindex->nHeight) == pindex &&
                 pindexBestHeader->GetAncestor(pindex->nHeight) == pindex &&
                 pindexBestHeader->nChainWork >= nMinimumChainWork) {
                 // This block is a member of the assumed verified chain and an
                 // ancestor of the best header. The equivalent time check
                 // discourages hash power from extorting the network via DOS
                 // attack into accepting an invalid block through telling users
                 // they must manually set assumevalid. Requiring a software
                 // change or burying the invalid block, regardless of the
                 // setting, makes it hard to hide the implication of the demand.
                 // This also avoids having release candidates that are hardly
                 // doing any signature verification at all in testing without
                 // having to artificially set the default assumed verified block
                 // further back. The test against nMinimumChainWork prevents the
                 // skipping when denied access to any chain at least as good as
                 // the expected chain.
                 fScriptChecks =
                     (GetBlockProofEquivalentTime(
                          *pindexBestHeader, *pindex, *pindexBestHeader,
                          consensusParams) <= 60 * 60 * 24 * 7 * 2);
             }
         }
     }
 
     int64_t nTime1 = GetTimeMicros();
     nTimeCheck += nTime1 - nTimeStart;
     LogPrint(BCLog::BENCH, "    - Sanity checks: %.2fms [%.2fs (%.2fms/blk)]\n",
              MILLI * (nTime1 - nTimeStart), nTimeCheck * MICRO,
              nTimeCheck * MILLI / nBlocksTotal);
 
     // Do not allow blocks that contain transactions which 'overwrite' older
     // transactions, unless those are already completely spent. If such
     // overwrites are allowed, coinbases and transactions depending upon those
     // can be duplicated to remove the ability to spend the first instance --
     // even after being sent to another address. See BIP30 and
     // http://r6.ca/blog/20120206T005236Z.html for more information. This logic
     // is not necessary for memory pool transactions, as AcceptToMemoryPool
     // already refuses previously-known transaction ids entirely. This rule was
     // originally applied to all blocks with a timestamp after March 15, 2012,
     // 0:00 UTC. Now that the whole chain is irreversibly beyond that time it is
     // applied to all blocks except the two in the chain that violate it. This
     // prevents exploiting the issue against nodes during their initial block
     // download.
     bool fEnforceBIP30 = !((pindex->nHeight == 91842 &&
                             pindex->GetBlockHash() ==
                                 uint256S("0x00000000000a4d0a398161ffc163c503763"
                                          "b1f4360639393e0e4c8e300e0caec")) ||
                            (pindex->nHeight == 91880 &&
                             pindex->GetBlockHash() ==
                                 uint256S("0x00000000000743f190a18c5577a3c2d2a1f"
                                          "610ae9601ac046a38084ccb7cd721")));
 
     // Once BIP34 activated it was not possible to create new duplicate
     // coinbases and thus other than starting with the 2 existing duplicate
     // coinbase pairs, not possible to create overwriting txs. But by the time
     // BIP34 activated, in each of the existing pairs the duplicate coinbase had
     // overwritten the first before the first had been spent. Since those
     // coinbases are sufficiently buried its no longer possible to create
     // further duplicate transactions descending from the known pairs either. If
     // we're on the known chain at height greater than where BIP34 activated, we
     // can save the db accesses needed for the BIP30 check.
     assert(pindex->pprev);
     CBlockIndex *pindexBIP34height =
         pindex->pprev->GetAncestor(consensusParams.BIP34Height);
     // Only continue to enforce if we're below BIP34 activation height or the
     // block hash at that height doesn't correspond.
     fEnforceBIP30 =
         fEnforceBIP30 &&
         (!pindexBIP34height ||
          !(pindexBIP34height->GetBlockHash() == consensusParams.BIP34Hash));
 
     if (fEnforceBIP30) {
         for (const auto &tx : block.vtx) {
             for (size_t o = 0; o < tx->vout.size(); o++) {
                 if (view.HaveCoin(COutPoint(tx->GetId(), o))) {
                     return state.DoS(
                         100,
                         error("ConnectBlock(): tried to overwrite transaction"),
                         REJECT_INVALID, "bad-txns-BIP30");
                 }
             }
         }
     }
 
     // Start enforcing BIP68 (sequence locks).
     int nLockTimeFlags = 0;
     if (pindex->nHeight >= consensusParams.CSVHeight) {
         nLockTimeFlags |= LOCKTIME_VERIFY_SEQUENCE;
     }
 
     const uint32_t flags =
         GetNextBlockScriptFlags(consensusParams, pindex->pprev);
 
     int64_t nTime2 = GetTimeMicros();
     nTimeForks += nTime2 - nTime1;
     LogPrint(BCLog::BENCH, "    - Fork checks: %.2fms [%.2fs (%.2fms/blk)]\n",
              MILLI * (nTime2 - nTime1), nTimeForks * MICRO,
              nTimeForks * MILLI / nBlocksTotal);
 
     CBlockUndo blockundo;
 
     CCheckQueueControl<CScriptCheck> control(fScriptChecks ? &scriptcheckqueue
                                                            : nullptr);
 
     std::vector<int> prevheights;
     Amount nFees = Amount::zero();
     int nInputs = 0;
 
     // Sigops counting. We need to do it again because of P2SH.
     uint64_t nSigOpsCount = 0;
     const uint64_t currentBlockSize =
         ::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION);
     const uint64_t nMaxSigOpsCount = GetMaxBlockSigOpsCount(currentBlockSize);
 
     blockundo.vtxundo.reserve(block.vtx.size() - 1);
 
     for (const auto &ptx : block.vtx) {
         const CTransaction &tx = *ptx;
 
         nInputs += tx.vin.size();
 
         if (tx.IsCoinBase()) {
             // We've already checked for sigops count before P2SH in CheckBlock.
             nSigOpsCount += GetSigOpCountWithoutP2SH(tx, flags);
         }
 
         // We do not need to throw when a transaction is duplicated. If they are
         // in the same block, CheckBlock will catch it, and if they are in a
         // different block, it'll register as a double spend or BIP30 violation.
         // In both cases, we get a more meaningful feedback out of it.
         AddCoins(view, tx, pindex->nHeight, true);
     }
 
     for (const auto &ptx : block.vtx) {
         const CTransaction &tx = *ptx;
         if (tx.IsCoinBase()) {
             continue;
         }
 
         Amount txfee = Amount::zero();
         if (!Consensus::CheckTxInputs(tx, state, view, pindex->nHeight,
                                       txfee)) {
             return error("%s: Consensus::CheckTxInputs: %s, %s", __func__,
                          tx.GetId().ToString(), FormatStateMessage(state));
         }
         nFees += txfee;
         if (!MoneyRange(nFees)) {
             return state.DoS(
                 100,
                 error("%s: accumulated fee in the block out of range.",
                       __func__),
                 REJECT_INVALID, "bad-txns-accumulated-fee-outofrange");
         }
 
         // Check that transaction is BIP68 final BIP68 lock checks (as
         // opposed to nLockTime checks) must be in ConnectBlock because they
         // require the UTXO set.
         prevheights.resize(tx.vin.size());
         for (size_t j = 0; j < tx.vin.size(); j++) {
             prevheights[j] = view.AccessCoin(tx.vin[j].prevout).GetHeight();
         }
 
         if (!SequenceLocks(tx, nLockTimeFlags, &prevheights, *pindex)) {
             return state.DoS(
                 100,
                 error("%s: contains a non-BIP68-final transaction", __func__),
                 REJECT_INVALID, "bad-txns-nonfinal");
         }
 
         // GetTransactionSigOpCount counts 2 types of sigops:
         // * legacy (always)
         // * p2sh (when P2SH enabled in flags and excludes coinbase)
         auto txSigOpsCount = GetTransactionSigOpCount(tx, view, flags);
         if (txSigOpsCount > MAX_TX_SIGOPS_COUNT) {
             return state.DoS(100, false, REJECT_INVALID, "bad-txn-sigops");
         }
 
         nSigOpsCount += txSigOpsCount;
         if (nSigOpsCount > nMaxSigOpsCount) {
             return state.DoS(100, error("ConnectBlock(): too many sigops"),
                              REJECT_INVALID, "bad-blk-sigops");
         }
 
         // Don't cache results if we're actually connecting blocks (still
         // consult the cache, though).
         bool fCacheResults = fJustCheck;
 
         std::vector<CScriptCheck> vChecks;
         if (!CheckInputs(tx, state, view, fScriptChecks, flags, fCacheResults,
                          fCacheResults, PrecomputedTransactionData(tx),
                          &vChecks)) {
             return error("ConnectBlock(): CheckInputs on %s failed with %s",
                          tx.GetId().ToString(), FormatStateMessage(state));
         }
 
         control.Add(vChecks);
 
         blockundo.vtxundo.push_back(CTxUndo());
         SpendCoins(view, tx, blockundo.vtxundo.back(), pindex->nHeight);
     }
 
     int64_t nTime3 = GetTimeMicros();
     nTimeConnect += nTime3 - nTime2;
     LogPrint(BCLog::BENCH,
              "      - Connect %u transactions: %.2fms (%.3fms/tx, %.3fms/txin) "
              "[%.2fs (%.2fms/blk)]\n",
              (unsigned)block.vtx.size(), MILLI * (nTime3 - nTime2),
              MILLI * (nTime3 - nTime2) / block.vtx.size(),
              nInputs <= 1 ? 0 : MILLI * (nTime3 - nTime2) / (nInputs - 1),
              nTimeConnect * MICRO, nTimeConnect * MILLI / nBlocksTotal);
 
     Amount blockReward =
         nFees + GetBlockSubsidy(pindex->nHeight, consensusParams);
     if (block.vtx[0]->GetValueOut() > blockReward) {
         return state.DoS(100,
                          error("ConnectBlock(): coinbase pays too much "
                                "(actual=%d vs limit=%d)",
                                block.vtx[0]->GetValueOut(), blockReward),
                          REJECT_INVALID, "bad-cb-amount");
     }
 
     if (!control.Wait()) {
         return state.DoS(100, false, REJECT_INVALID, "blk-bad-inputs", false,
                          "parallel script check failed");
     }
 
     int64_t nTime4 = GetTimeMicros();
     nTimeVerify += nTime4 - nTime2;
     LogPrint(
         BCLog::BENCH,
         "    - Verify %u txins: %.2fms (%.3fms/txin) [%.2fs (%.2fms/blk)]\n",
         nInputs - 1, MILLI * (nTime4 - nTime2),
         nInputs <= 1 ? 0 : MILLI * (nTime4 - nTime2) / (nInputs - 1),
         nTimeVerify * MICRO, nTimeVerify * MILLI / nBlocksTotal);
 
     if (fJustCheck) {
         return true;
     }
 
     if (!WriteUndoDataForBlock(blockundo, state, pindex, params)) {
         return false;
     }
 
     if (!pindex->IsValid(BlockValidity::SCRIPTS)) {
         pindex->RaiseValidity(BlockValidity::SCRIPTS);
         setDirtyBlockIndex.insert(pindex);
     }
 
     assert(pindex->phashBlock);
     // add this block to the view's block chain
     view.SetBestBlock(pindex->GetBlockHash());
 
     int64_t nTime5 = GetTimeMicros();
     nTimeIndex += nTime5 - nTime4;
     LogPrint(BCLog::BENCH, "    - Index writing: %.2fms [%.2fs (%.2fms/blk)]\n",
              MILLI * (nTime5 - nTime4), nTimeIndex * MICRO,
              nTimeIndex * MILLI / nBlocksTotal);
 
     int64_t nTime6 = GetTimeMicros();
     nTimeCallbacks += nTime6 - nTime5;
     LogPrint(BCLog::BENCH, "    - Callbacks: %.2fms [%.2fs (%.2fms/blk)]\n",
              MILLI * (nTime6 - nTime5), nTimeCallbacks * MICRO,
              nTimeCallbacks * MILLI / nBlocksTotal);
 
     return true;
 }
 
 /**
  * Update the on-disk chain state.
  * The caches and indexes are flushed depending on the mode we're called with if
  * they're too large, if it's been a while since the last write, or always and
  * in all cases if we're in prune mode and are deleting files.
  *
  * If FlushStateMode::NONE is used, then FlushStateToDisk(...) won't do anything
  * besides checking if we need to prune.
  */
 static bool FlushStateToDisk(const CChainParams &chainparams,
                              CValidationState &state, FlushStateMode mode,
                              int nManualPruneHeight) {
     int64_t nMempoolUsage = g_mempool.DynamicMemoryUsage();
     LOCK(cs_main);
     static int64_t nLastWrite = 0;
     static int64_t nLastFlush = 0;
     std::set<int> setFilesToPrune;
     bool full_flush_completed = false;
     try {
         {
             bool fFlushForPrune = false;
             bool fDoFullFlush = false;
             LOCK(cs_LastBlockFile);
             if (fPruneMode && (fCheckForPruning || nManualPruneHeight > 0) &&
                 !fReindex) {
                 if (nManualPruneHeight > 0) {
                     FindFilesToPruneManual(setFilesToPrune, nManualPruneHeight);
                 } else {
                     FindFilesToPrune(setFilesToPrune,
                                      chainparams.PruneAfterHeight());
                     fCheckForPruning = false;
                 }
                 if (!setFilesToPrune.empty()) {
                     fFlushForPrune = true;
                     if (!fHavePruned) {
                         pblocktree->WriteFlag("prunedblockfiles", true);
                         fHavePruned = true;
                     }
                 }
             }
             int64_t nNow = GetTimeMicros();
             // Avoid writing/flushing immediately after startup.
             if (nLastWrite == 0) {
                 nLastWrite = nNow;
             }
             if (nLastFlush == 0) {
                 nLastFlush = nNow;
             }
             int64_t nMempoolSizeMax =
                 gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000;
             int64_t cacheSize = pcoinsTip->DynamicMemoryUsage();
             int64_t nTotalSpace =
                 nCoinCacheUsage +
                 std::max<int64_t>(nMempoolSizeMax - nMempoolUsage, 0);
             // The cache is large and we're within 10% and 10 MiB of the limit,
             // but we have time now (not in the middle of a block processing).
             bool fCacheLarge =
                 mode == FlushStateMode::PERIODIC &&
                 cacheSize > std::max((9 * nTotalSpace) / 10,
                                      nTotalSpace -
                                          MAX_BLOCK_COINSDB_USAGE * 1024 * 1024);
             // The cache is over the limit, we have to write now.
             bool fCacheCritical =
                 mode == FlushStateMode::IF_NEEDED && cacheSize > nTotalSpace;
             // It's been a while since we wrote the block index to disk. Do this
             // frequently, so we don't need to redownload after a crash.
             bool fPeriodicWrite =
                 mode == FlushStateMode::PERIODIC &&
                 nNow > nLastWrite + (int64_t)DATABASE_WRITE_INTERVAL * 1000000;
             // It's been very long since we flushed the cache. Do this
             // infrequently, to optimize cache usage.
             bool fPeriodicFlush =
                 mode == FlushStateMode::PERIODIC &&
                 nNow > nLastFlush + (int64_t)DATABASE_FLUSH_INTERVAL * 1000000;
             // Combine all conditions that result in a full cache flush.
             fDoFullFlush = (mode == FlushStateMode::ALWAYS) || fCacheLarge ||
                            fCacheCritical || fPeriodicFlush || fFlushForPrune;
             // Write blocks and block index to disk.
             if (fDoFullFlush || fPeriodicWrite) {
                 // Depend on nMinDiskSpace to ensure we can write block index
                 if (!CheckDiskSpace(GetBlocksDir())) {
                     return AbortNode(state, "Disk space is low!",
                                      _("Error: Disk space is low!"));
                 }
 
                 // First make sure all block and undo data is flushed to disk.
                 FlushBlockFile();
                 // Then update all block file information (which may refer to
                 // block and undo files).
                 {
                     std::vector<std::pair<int, const CBlockFileInfo *>> vFiles;
                     vFiles.reserve(setDirtyFileInfo.size());
                     for (int i : setDirtyFileInfo) {
                         vFiles.push_back(std::make_pair(i, &vinfoBlockFile[i]));
                     }
 
                     setDirtyFileInfo.clear();
 
                     std::vector<const CBlockIndex *> vBlocks;
                     vBlocks.reserve(setDirtyBlockIndex.size());
                     for (const CBlockIndex *cbi : setDirtyBlockIndex) {
                         vBlocks.push_back(cbi);
                     }
 
                     setDirtyBlockIndex.clear();
 
                     if (!pblocktree->WriteBatchSync(vFiles, nLastBlockFile,
                                                     vBlocks)) {
                         return AbortNode(
                             state, "Failed to write to block index database");
                     }
                 }
 
                 // Finally remove any pruned files
                 if (fFlushForPrune) {
                     UnlinkPrunedFiles(setFilesToPrune);
                 }
                 nLastWrite = nNow;
             }
             // Flush best chain related state. This can only be done if the
             // blocks / block index write was also done.
             if (fDoFullFlush && !pcoinsTip->GetBestBlock().IsNull()) {
                 // Typical Coin structures on disk are around 48 bytes in size.
                 // Pushing a new one to the database can cause it to be written
                 // twice (once in the log, and once in the tables). This is
                 // already an overestimation, as most will delete an existing
                 // entry or overwrite one. Still, use a conservative safety
                 // factor of 2.
                 if (!CheckDiskSpace(GetDataDir(),
                                     48 * 2 * 2 * pcoinsTip->GetCacheSize())) {
                     return AbortNode(state, "Disk space is low!",
                                      _("Error: Disk space is low!"));
                 }
 
                 // Flush the chainstate (which may refer to block index
                 // entries).
                 if (!pcoinsTip->Flush()) {
                     return AbortNode(state, "Failed to write to coin database");
                 }
                 nLastFlush = nNow;
                 full_flush_completed = true;
             }
         }
 
         if (full_flush_completed) {
             // Update best block in wallet (so we can detect restored wallets).
             GetMainSignals().ChainStateFlushed(chainActive.GetLocator());
         }
     } catch (const std::runtime_error &e) {
         return AbortNode(state, std::string("System error while flushing: ") +
                                     e.what());
     }
     return true;
 }
 
 void FlushStateToDisk() {
     CValidationState state;
     const CChainParams &chainparams = Params();
     if (!FlushStateToDisk(chainparams, state, FlushStateMode::ALWAYS)) {
         LogPrintf("%s: failed to flush state (%s)\n", __func__,
                   FormatStateMessage(state));
     }
 }
 
 void PruneAndFlush() {
     CValidationState state;
     fCheckForPruning = true;
     const CChainParams &chainparams = Params();
     if (!FlushStateToDisk(chainparams, state, FlushStateMode::NONE)) {
         LogPrintf("%s: failed to flush state (%s)\n", __func__,
                   FormatStateMessage(state));
     }
 }
 
 /** Check warning conditions and do some notifications on new chain tip set. */
 static void UpdateTip(const Config &config, CBlockIndex *pindexNew) {
     // New best block
     g_mempool.AddTransactionsUpdated(1);
 
     {
         LOCK(g_best_block_mutex);
         g_best_block = pindexNew->GetBlockHash();
         g_best_block_cv.notify_all();
     }
 
     LogPrintf(
         "%s: new best=%s height=%d version=0x%08x log2_work=%.8g tx=%lu "
         "date='%s' progress=%f cache=%.1fMiB(%utxo)\n",
         __func__, pindexNew->GetBlockHash().ToString(), pindexNew->nHeight,
         pindexNew->nVersion, log(pindexNew->nChainWork.getdouble()) / log(2.0),
         (unsigned long)pindexNew->nChainTx,
         FormatISO8601DateTime(pindexNew->GetBlockTime()),
         GuessVerificationProgress(config.GetChainParams().TxData(), pindexNew),
         pcoinsTip->DynamicMemoryUsage() * (1.0 / (1 << 20)),
         pcoinsTip->GetCacheSize());
 }
 
 /**
  * Disconnect chainActive's tip.
  * After calling, the mempool will be in an inconsistent state, with
  * transactions from disconnected blocks being added to disconnectpool. You
  * should make the mempool consistent again by calling updateMempoolForReorg.
  * with cs_main held.
  *
  * If disconnectpool is nullptr, then no disconnected transactions are added to
  * disconnectpool (note that the caller is responsible for mempool consistency
  * in any case).
  */
 bool CChainState::DisconnectTip(const Config &config, CValidationState &state,
                                 DisconnectedBlockTransactions *disconnectpool)
     EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
     CBlockIndex *pindexDelete = chainActive.Tip();
     const Consensus::Params &consensusParams =
         config.GetChainParams().GetConsensus();
 
     assert(pindexDelete);
 
     // Read block from disk.
     std::shared_ptr<CBlock> pblock = std::make_shared<CBlock>();
     CBlock &block = *pblock;
     if (!ReadBlockFromDisk(block, pindexDelete, consensusParams)) {
         return AbortNode(state, "Failed to read block");
     }
 
     // Apply the block atomically to the chain state.
     int64_t nStart = GetTimeMicros();
     {
         CCoinsViewCache view(pcoinsTip.get());
         assert(view.GetBestBlock() == pindexDelete->GetBlockHash());
         if (DisconnectBlock(block, pindexDelete, view) != DISCONNECT_OK) {
             return error("DisconnectTip(): DisconnectBlock %s failed",
                          pindexDelete->GetBlockHash().ToString());
         }
 
         bool flushed = view.Flush();
         assert(flushed);
     }
 
     LogPrint(BCLog::BENCH, "- Disconnect block: %.2fms\n",
              (GetTimeMicros() - nStart) * MILLI);
 
     // Write the chain state to disk, if necessary.
     if (!FlushStateToDisk(config.GetChainParams(), state,
                           FlushStateMode::IF_NEEDED)) {
         return false;
     }
 
     // If this block is deactivating a fork, we move all mempool transactions
     // in front of disconnectpool for reprocessing in a future
     // updateMempoolForReorg call
     if (pindexDelete->pprev != nullptr &&
         GetNextBlockScriptFlags(consensusParams, pindexDelete) !=
             GetNextBlockScriptFlags(consensusParams, pindexDelete->pprev)) {
         LogPrint(BCLog::MEMPOOL,
                  "Disconnecting mempool due to rewind of upgrade block\n");
         if (disconnectpool) {
             disconnectpool->importMempool(g_mempool);
         }
         g_mempool.clear();
     }
 
     if (disconnectpool) {
         disconnectpool->addForBlock(block.vtx);
     }
 
     // If the tip is finalized, then undo it.
     if (pindexFinalized == pindexDelete) {
         pindexFinalized = pindexDelete->pprev;
     }
 
     chainActive.SetTip(pindexDelete->pprev);
 
     // Update chainActive and related variables.
     UpdateTip(config, pindexDelete->pprev);
     // Let wallets know transactions went from 1-confirmed to
     // 0-confirmed or conflicted:
     GetMainSignals().BlockDisconnected(pblock);
     return true;
 }
 
 static int64_t nTimeReadFromDisk = 0;
 static int64_t nTimeConnectTotal = 0;
 static int64_t nTimeFlush = 0;
 static int64_t nTimeChainState = 0;
 static int64_t nTimePostConnect = 0;
 
 struct PerBlockConnectTrace {
     CBlockIndex *pindex = nullptr;
     std::shared_ptr<const CBlock> pblock;
     std::shared_ptr<std::vector<CTransactionRef>> conflictedTxs;
     PerBlockConnectTrace()
         : conflictedTxs(std::make_shared<std::vector<CTransactionRef>>()) {}
 };
 
 /**
  * Used to track blocks whose transactions were applied to the UTXO state as a
  * part of a single ActivateBestChainStep call.
  *
  * This class also tracks transactions that are removed from the mempool as
  * conflicts (per block) and can be used to pass all those transactions through
  * SyncTransaction.
  *
  * This class assumes (and asserts) that the conflicted transactions for a given
  * block are added via mempool callbacks prior to the BlockConnected()
  * associated with those transactions. If any transactions are marked
  * conflicted, it is assumed that an associated block will always be added.
  *
  * This class is single-use, once you call GetBlocksConnected() you have to
  * throw it away and make a new one.
  */
 class ConnectTrace {
 private:
     std::vector<PerBlockConnectTrace> blocksConnected;
     CTxMemPool &pool;
     boost::signals2::scoped_connection m_connNotifyEntryRemoved;
 
 public:
     explicit ConnectTrace(CTxMemPool &_pool) : blocksConnected(1), pool(_pool) {
         m_connNotifyEntryRemoved = pool.NotifyEntryRemoved.connect(
-            boost::bind(&ConnectTrace::NotifyEntryRemoved, this, _1, _2));
+            std::bind(&ConnectTrace::NotifyEntryRemoved, this,
+                      std::placeholders::_1, std::placeholders::_2));
     }
 
     void BlockConnected(CBlockIndex *pindex,
                         std::shared_ptr<const CBlock> pblock) {
         assert(!blocksConnected.back().pindex);
         assert(pindex);
         assert(pblock);
         blocksConnected.back().pindex = pindex;
         blocksConnected.back().pblock = std::move(pblock);
         blocksConnected.emplace_back();
     }
 
     std::vector<PerBlockConnectTrace> &GetBlocksConnected() {
         // We always keep one extra block at the end of our list because blocks
         // are added after all the conflicted transactions have been filled in.
         // Thus, the last entry should always be an empty one waiting for the
         // transactions from the next block. We pop the last entry here to make
         // sure the list we return is sane.
         assert(!blocksConnected.back().pindex);
         assert(blocksConnected.back().conflictedTxs->empty());
         blocksConnected.pop_back();
         return blocksConnected;
     }
 
     void NotifyEntryRemoved(CTransactionRef txRemoved,
                             MemPoolRemovalReason reason) {
         assert(!blocksConnected.back().pindex);
         if (reason == MemPoolRemovalReason::CONFLICT) {
             blocksConnected.back().conflictedTxs->emplace_back(
                 std::move(txRemoved));
         }
     }
 };
 
 static bool FinalizeBlockInternal(const Config &config, CValidationState &state,
                                   const CBlockIndex *pindex) {
     AssertLockHeld(cs_main);
     if (pindex->nStatus.isInvalid()) {
         // We try to finalize an invalid block.
         return state.DoS(100,
                          error("%s: Trying to finalize invalid block %s",
                                __func__, pindex->GetBlockHash().ToString()),
                          REJECT_INVALID, "finalize-invalid-block");
     }
 
     // Check that the request is consistent with current finalization.
     if (pindexFinalized && !AreOnTheSameFork(pindex, pindexFinalized)) {
         return state.DoS(
             20,
             error("%s: Trying to finalize block %s which conflicts "
                   "with already finalized block",
                   __func__, pindex->GetBlockHash().ToString()),
             REJECT_AGAINST_FINALIZED, "bad-fork-prior-finalized");
     }
 
     if (IsBlockFinalized(pindex)) {
         // The block is already finalized.
         return true;
     }
 
     // We have a new block to finalize.
     pindexFinalized = pindex;
     return true;
 }
 
 static const CBlockIndex *FindBlockToFinalize(const Config &config,
                                               CBlockIndex *pindexNew) {
     AssertLockHeld(cs_main);
 
     const int32_t maxreorgdepth =
         gArgs.GetArg("-maxreorgdepth", DEFAULT_MAX_REORG_DEPTH);
 
     const int64_t finalizationdelay =
         gArgs.GetArg("-finalizationdelay", DEFAULT_MIN_FINALIZATION_DELAY);
 
     // Find our candidate.
     // If maxreorgdepth is < 0 pindex will be null and auto finalization
     // disabled
     const CBlockIndex *pindex =
         pindexNew->GetAncestor(pindexNew->nHeight - maxreorgdepth);
 
     int64_t now = GetTime();
 
     // If the finalization delay is not expired since the startup time,
     // finalization should be avoided. Header receive time is not saved to disk
     // and so cannot be anterior to startup time.
     if (now < (GetStartupTime() + finalizationdelay)) {
         return nullptr;
     }
 
     // While our candidate is not eligible (finalization delay not expired), try
     // the previous one.
     while (pindex && (pindex != pindexFinalized)) {
         // Check that the block to finalize is known for a long enough time.
         // This test will ensure that an attacker could not cause a block to
         // finalize by forking the chain with a depth > maxreorgdepth.
         // If the block is loaded from disk, header receive time is 0 and the
         // block will be finalized. This is safe because the delay since the
         // node startup is already expired.
         auto headerReceivedTime = pindex->GetHeaderReceivedTime();
 
         // If finalization delay is <= 0, finalization always occurs immediately
         if (now >= (headerReceivedTime + finalizationdelay)) {
             return pindex;
         }
 
         pindex = pindex->pprev;
     }
 
     return nullptr;
 }
 
 /**
  * Connect a new block to chainActive. pblock is either nullptr or a pointer to
  * a CBlock corresponding to pindexNew, to bypass loading it again from disk.
  *
  * The block is always added to connectTrace (either after loading from disk or
  * by copying pblock) - if that is not intended, care must be taken to remove
  * the last entry in blocksConnected in case of failure.
  */
 bool CChainState::ConnectTip(const Config &config, CValidationState &state,
                              CBlockIndex *pindexNew,
                              const std::shared_ptr<const CBlock> &pblock,
                              ConnectTrace &connectTrace,
                              DisconnectedBlockTransactions &disconnectpool) {
     AssertLockHeld(cs_main);
 
     const CChainParams &params = config.GetChainParams();
     const Consensus::Params &consensusParams = params.GetConsensus();
 
     assert(pindexNew->pprev == chainActive.Tip());
     // Read block from disk.
     int64_t nTime1 = GetTimeMicros();
     std::shared_ptr<const CBlock> pthisBlock;
     if (!pblock) {
         std::shared_ptr<CBlock> pblockNew = std::make_shared<CBlock>();
         if (!ReadBlockFromDisk(*pblockNew, pindexNew, consensusParams)) {
             return AbortNode(state, "Failed to read block");
         }
         pthisBlock = pblockNew;
     } else {
         pthisBlock = pblock;
     }
 
     const CBlock &blockConnecting = *pthisBlock;
 
     // Apply the block atomically to the chain state.
     int64_t nTime2 = GetTimeMicros();
     nTimeReadFromDisk += nTime2 - nTime1;
     int64_t nTime3;
     LogPrint(BCLog::BENCH, "  - Load block from disk: %.2fms [%.2fs]\n",
              (nTime2 - nTime1) * MILLI, nTimeReadFromDisk * MICRO);
     {
         CCoinsViewCache view(pcoinsTip.get());
         bool rv = ConnectBlock(blockConnecting, state, pindexNew, view, params,
                                BlockValidationOptions(config));
         GetMainSignals().BlockChecked(blockConnecting, state);
         if (!rv) {
             if (state.IsInvalid()) {
                 InvalidBlockFound(pindexNew, state);
             }
 
             return error("ConnectTip(): ConnectBlock %s failed (%s)",
                          pindexNew->GetBlockHash().ToString(),
                          FormatStateMessage(state));
         }
 
         // Update the finalized block.
         const CBlockIndex *pindexToFinalize =
             FindBlockToFinalize(config, pindexNew);
         if (pindexToFinalize &&
             !FinalizeBlockInternal(config, state, pindexToFinalize)) {
             state.SetCorruptionPossible();
             return error("ConnectTip(): FinalizeBlock %s failed (%s)",
                          pindexNew->GetBlockHash().ToString(),
                          FormatStateMessage(state));
         }
 
         nTime3 = GetTimeMicros();
         nTimeConnectTotal += nTime3 - nTime2;
         LogPrint(BCLog::BENCH,
                  "  - Connect total: %.2fms [%.2fs (%.2fms/blk)]\n",
                  (nTime3 - nTime2) * MILLI, nTimeConnectTotal * MICRO,
                  nTimeConnectTotal * MILLI / nBlocksTotal);
         bool flushed = view.Flush();
         assert(flushed);
     }
 
     int64_t nTime4 = GetTimeMicros();
     nTimeFlush += nTime4 - nTime3;
     LogPrint(BCLog::BENCH, "  - Flush: %.2fms [%.2fs (%.2fms/blk)]\n",
              (nTime4 - nTime3) * MILLI, nTimeFlush * MICRO,
              nTimeFlush * MILLI / nBlocksTotal);
 
     // Write the chain state to disk, if necessary.
     if (!FlushStateToDisk(config.GetChainParams(), state,
                           FlushStateMode::IF_NEEDED)) {
         return false;
     }
 
     int64_t nTime5 = GetTimeMicros();
     nTimeChainState += nTime5 - nTime4;
     LogPrint(BCLog::BENCH,
              "  - Writing chainstate: %.2fms [%.2fs (%.2fms/blk)]\n",
              (nTime5 - nTime4) * MILLI, nTimeChainState * MICRO,
              nTimeChainState * MILLI / nBlocksTotal);
 
     // Remove conflicting transactions from the mempool.;
     g_mempool.removeForBlock(blockConnecting.vtx, pindexNew->nHeight);
     disconnectpool.removeForBlock(blockConnecting.vtx);
 
     // If this block is activating a fork, we move all mempool transactions
     // in front of disconnectpool for reprocessing in a future
     // updateMempoolForReorg call
     if (pindexNew->pprev != nullptr &&
         GetNextBlockScriptFlags(consensusParams, pindexNew) !=
             GetNextBlockScriptFlags(consensusParams, pindexNew->pprev)) {
         LogPrint(BCLog::MEMPOOL,
                  "Disconnecting mempool due to acceptance of upgrade block\n");
         disconnectpool.importMempool(g_mempool);
     }
 
     // Update chainActive & related variables.
     chainActive.SetTip(pindexNew);
     UpdateTip(config, pindexNew);
 
     int64_t nTime6 = GetTimeMicros();
     nTimePostConnect += nTime6 - nTime5;
     nTimeTotal += nTime6 - nTime1;
     LogPrint(BCLog::BENCH,
              "  - Connect postprocess: %.2fms [%.2fs (%.2fms/blk)]\n",
              (nTime6 - nTime5) * MILLI, nTimePostConnect * MICRO,
              nTimePostConnect * MILLI / nBlocksTotal);
     LogPrint(BCLog::BENCH, "- Connect block: %.2fms [%.2fs (%.2fms/blk)]\n",
              (nTime6 - nTime1) * MILLI, nTimeTotal * MICRO,
              nTimeTotal * MILLI / nBlocksTotal);
 
     connectTrace.BlockConnected(pindexNew, std::move(pthisBlock));
     return true;
 }
 
 /**
  * Return the tip of the chain with the most work in it, that isn't known to be
  * invalid (it's however far from certain to be valid).
  */
 CBlockIndex *CChainState::FindMostWorkChain() {
     AssertLockHeld(cs_main);
     do {
         CBlockIndex *pindexNew = nullptr;
 
         // Find the best candidate header.
         {
             std::set<CBlockIndex *, CBlockIndexWorkComparator>::reverse_iterator
                 it = setBlockIndexCandidates.rbegin();
             if (it == setBlockIndexCandidates.rend()) {
                 return nullptr;
             }
             pindexNew = *it;
         }
 
         // If this block will cause a finalized block to be reorged, then we
         // mark it as invalid.
         if (pindexFinalized && !AreOnTheSameFork(pindexNew, pindexFinalized)) {
             LogPrintf("Mark block %s invalid because it forks prior to the "
                       "finalization point %d.\n",
                       pindexNew->GetBlockHash().ToString(),
                       pindexFinalized->nHeight);
             pindexNew->nStatus = pindexNew->nStatus.withFailed();
             InvalidChainFound(pindexNew);
         }
 
         const CBlockIndex *pindexFork = chainActive.FindFork(pindexNew);
 
         // Check whether all blocks on the path between the currently active
         // chain and the candidate are valid. Just going until the active chain
         // is an optimization, as we know all blocks in it are valid already.
         CBlockIndex *pindexTest = pindexNew;
         bool hasValidAncestor = true;
         while (hasValidAncestor && pindexTest && pindexTest != pindexFork) {
             assert(pindexTest->nChainTx || pindexTest->nHeight == 0);
 
             // If this is a parked chain, but it has enough PoW, clear the park
             // state.
             bool fParkedChain = pindexTest->nStatus.isOnParkedChain();
             if (fParkedChain && gArgs.GetBoolArg("-parkdeepreorg", true)) {
                 const CBlockIndex *pindexTip = chainActive.Tip();
 
                 // During initialization, pindexTip and/or pindexFork may be
                 // null. In this case, we just ignore the fact that the chain is
                 // parked.
                 if (!pindexTip || !pindexFork) {
                     UnparkBlock(pindexTest);
                     continue;
                 }
 
                 // A parked chain can be unparked if it has twice as much PoW
                 // accumulated as the main chain has since the fork block.
                 CBlockIndex const *pindexExtraPow = pindexTip;
                 arith_uint256 requiredWork = pindexTip->nChainWork;
                 switch (pindexTip->nHeight - pindexFork->nHeight) {
                     // Limit the penality for depth 1, 2 and 3 to half a block
                     // worth of work to ensure we don't fork accidentally.
                     case 3:
                     case 2:
                         pindexExtraPow = pindexExtraPow->pprev;
                     // FALLTHROUGH
                     case 1: {
                         const arith_uint256 deltaWork =
                             pindexExtraPow->nChainWork - pindexFork->nChainWork;
                         requiredWork += (deltaWork >> 1);
                         break;
                     }
                     default:
                         requiredWork +=
                             pindexExtraPow->nChainWork - pindexFork->nChainWork;
                         break;
                 }
 
                 if (pindexNew->nChainWork > requiredWork) {
                     // We have enough, clear the parked state.
                     LogPrintf("Unpark block %s as its chain has accumulated "
                               "enough PoW.\n",
                               pindexTest->GetBlockHash().ToString());
                     fParkedChain = false;
                     UnparkBlock(pindexTest);
                 }
             }
 
             // Pruned nodes may have entries in setBlockIndexCandidates for
             // which block files have been deleted. Remove those as candidates
             // for the most work chain if we come across them; we can't switch
             // to a chain unless we have all the non-active-chain parent blocks.
             bool fInvalidChain = pindexTest->nStatus.isInvalid();
             bool fMissingData = !pindexTest->nStatus.hasData();
             if (!(fInvalidChain || fParkedChain || fMissingData)) {
                 // The current block is acceptable, move to the parent, up to
                 // the fork point.
                 pindexTest = pindexTest->pprev;
                 continue;
             }
 
             // Candidate chain is not usable (either invalid or missing data)
             hasValidAncestor = false;
             setBlockIndexCandidates.erase(pindexTest);
 
             if (fInvalidChain &&
                 (pindexBestInvalid == nullptr ||
                  pindexNew->nChainWork > pindexBestInvalid->nChainWork)) {
                 pindexBestInvalid = pindexNew;
             }
 
             if (fParkedChain &&
                 (pindexBestParked == nullptr ||
                  pindexNew->nChainWork > pindexBestParked->nChainWork)) {
                 pindexBestParked = pindexNew;
             }
 
             CBlockIndex *pindexFailed = pindexNew;
             // Remove the entire chain from the set.
             while (pindexTest != pindexFailed) {
                 if (fInvalidChain || fParkedChain) {
                     pindexFailed->nStatus =
                         pindexFailed->nStatus.withFailedParent(fInvalidChain)
                             .withParkedParent(fParkedChain);
                 } else if (fMissingData) {
                     // If we're missing data, then add back to
                     // mapBlocksUnlinked, so that if the block arrives in the
                     // future we can try adding to setBlockIndexCandidates
                     // again.
                     mapBlocksUnlinked.insert(
                         std::make_pair(pindexFailed->pprev, pindexFailed));
                 }
                 setBlockIndexCandidates.erase(pindexFailed);
                 pindexFailed = pindexFailed->pprev;
             }
 
             if (fInvalidChain || fParkedChain) {
                 // We discovered a new chain tip that is either parked or
                 // invalid, we may want to warn.
                 CheckForkWarningConditionsOnNewFork(pindexNew);
             }
         }
 
         // We found a candidate that has valid ancestors. This is our guy.
         if (hasValidAncestor) {
             return pindexNew;
         }
     } while (true);
 }
 
 /**
  * Delete all entries in setBlockIndexCandidates that are worse than the current
  * tip.
  */
 void CChainState::PruneBlockIndexCandidates() {
     // Note that we can't delete the current block itself, as we may need to
     // return to it later in case a reorganization to a better block fails.
     auto it = setBlockIndexCandidates.begin();
     while (it != setBlockIndexCandidates.end() &&
            setBlockIndexCandidates.value_comp()(*it, chainActive.Tip())) {
         setBlockIndexCandidates.erase(it++);
     }
 
     // Either the current tip or a successor of it we're working towards is left
     // in setBlockIndexCandidates.
     assert(!setBlockIndexCandidates.empty());
 }
 
 /**
  * Try to make some progress towards making pindexMostWork the active block.
  * pblock is either nullptr or a pointer to a CBlock corresponding to
  * pindexMostWork.
  */
 bool CChainState::ActivateBestChainStep(
     const Config &config, CValidationState &state, CBlockIndex *pindexMostWork,
     const std::shared_ptr<const CBlock> &pblock, bool &fInvalidFound,
     ConnectTrace &connectTrace) {
     AssertLockHeld(cs_main);
 
     const CBlockIndex *pindexOldTip = chainActive.Tip();
     const CBlockIndex *pindexFork = chainActive.FindFork(pindexMostWork);
 
     // Disconnect active blocks which are no longer in the best chain.
     bool fBlocksDisconnected = false;
     DisconnectedBlockTransactions disconnectpool;
     while (chainActive.Tip() && chainActive.Tip() != pindexFork) {
         if (!DisconnectTip(config, state, &disconnectpool)) {
             // This is likely a fatal error, but keep the mempool consistent,
             // just in case. Only remove from the mempool in this case.
             disconnectpool.updateMempoolForReorg(config, false);
             return false;
         }
 
         fBlocksDisconnected = true;
     }
 
     // Build list of new blocks to connect.
     std::vector<CBlockIndex *> vpindexToConnect;
     bool fContinue = true;
     int nHeight = pindexFork ? pindexFork->nHeight : -1;
     while (fContinue && nHeight != pindexMostWork->nHeight) {
         // Don't iterate the entire list of potential improvements toward the
         // best tip, as we likely only need a few blocks along the way.
         int nTargetHeight = std::min(nHeight + 32, pindexMostWork->nHeight);
         vpindexToConnect.clear();
         vpindexToConnect.reserve(nTargetHeight - nHeight);
         CBlockIndex *pindexIter = pindexMostWork->GetAncestor(nTargetHeight);
         while (pindexIter && pindexIter->nHeight != nHeight) {
             vpindexToConnect.push_back(pindexIter);
             pindexIter = pindexIter->pprev;
         }
 
         nHeight = nTargetHeight;
 
         // Connect new blocks.
         for (CBlockIndex *pindexConnect : reverse_iterate(vpindexToConnect)) {
             if (!ConnectTip(config, state, pindexConnect,
                             pindexConnect == pindexMostWork
                                 ? pblock
                                 : std::shared_ptr<const CBlock>(),
                             connectTrace, disconnectpool)) {
                 if (state.IsInvalid()) {
                     // The block violates a consensus rule.
                     if (!state.CorruptionPossible()) {
                         InvalidChainFound(vpindexToConnect.back());
                     }
 
                     state = CValidationState();
                     fInvalidFound = true;
                     fContinue = false;
                     break;
                 }
 
                 // A system error occurred (disk space, database error, ...).
                 // Make the mempool consistent with the current tip, just in
                 // case any observers try to use it before shutdown.
                 disconnectpool.updateMempoolForReorg(config, false);
                 return false;
             } else {
                 PruneBlockIndexCandidates();
                 if (!pindexOldTip ||
                     chainActive.Tip()->nChainWork > pindexOldTip->nChainWork) {
                     // We're in a better position than we were. Return
                     // temporarily to release the lock.
                     fContinue = false;
                     break;
                 }
             }
         }
     }
 
     if (fBlocksDisconnected || !disconnectpool.isEmpty()) {
         // If any blocks were disconnected, we need to update the mempool even
         // if disconnectpool is empty. The disconnectpool may also be non-empty
         // if the mempool was imported due to new validation rules being in
         // effect.
         LogPrint(BCLog::MEMPOOL, "Updating mempool due to reorganization or "
                                  "rules upgrade/downgrade\n");
         disconnectpool.updateMempoolForReorg(config, true);
     }
 
     g_mempool.check(pcoinsTip.get());
 
     // Callbacks/notifications for a new best chain.
     if (fInvalidFound) {
         CheckForkWarningConditionsOnNewFork(pindexMostWork);
     } else {
         CheckForkWarningConditions();
     }
 
     return true;
 }
 
 static void NotifyHeaderTip() {
     bool fNotify = false;
     bool fInitialBlockDownload = false;
     static CBlockIndex *pindexHeaderOld = nullptr;
     CBlockIndex *pindexHeader = nullptr;
     {
         LOCK(cs_main);
         pindexHeader = pindexBestHeader;
 
         if (pindexHeader != pindexHeaderOld) {
             fNotify = true;
             fInitialBlockDownload = IsInitialBlockDownload();
             pindexHeaderOld = pindexHeader;
         }
     }
 
     // Send block tip changed notifications without cs_main
     if (fNotify) {
         uiInterface.NotifyHeaderTip(fInitialBlockDownload, pindexHeader);
     }
 }
 
 /**
  * Make the best chain active, in multiple steps. The result is either failure
  * or an activated best chain. pblock is either nullptr or a pointer to a block
  * that is already loaded (to avoid loading it again from disk).
  */
 bool CChainState::ActivateBestChain(const Config &config,
                                     CValidationState &state,
                                     std::shared_ptr<const CBlock> pblock) {
     // Note that while we're often called here from ProcessNewBlock, this is
     // far from a guarantee. Things in the P2P/RPC will often end up calling
     // us in the middle of ProcessNewBlock - do not assume pblock is set
     // sanely for performance or correctness!
     AssertLockNotHeld(cs_main);
 
     // ABC maintains a fair degree of expensive-to-calculate internal state
     // because this function periodically releases cs_main so that it does not
     // lock up other threads for too long during large connects - and to allow
     // for e.g. the callback queue to drain we use m_cs_chainstate to enforce
     // mutual exclusion so that only one caller may execute this function at a
     // time
     LOCK(m_cs_chainstate);
 
     CBlockIndex *pindexMostWork = nullptr;
     CBlockIndex *pindexNewTip = nullptr;
     int nStopAtHeight = gArgs.GetArg("-stopatheight", DEFAULT_STOPATHEIGHT);
     do {
         boost::this_thread::interruption_point();
 
         if (GetMainSignals().CallbacksPending() > 10) {
             // Block until the validation queue drains. This should largely
             // never happen in normal operation, however may happen during
             // reindex, causing memory blowup if we run too far ahead.
             SyncWithValidationInterfaceQueue();
         }
 
         {
             LOCK(cs_main);
             CBlockIndex *starting_tip = chainActive.Tip();
             bool blocks_connected = false;
             do {
                 // We absolutely may not unlock cs_main until we've made forward
                 // progress (with the exception of shutdown due to hardware
                 // issues, low disk space, etc).
 
                 // Destructed before cs_main is unlocked
                 ConnectTrace connectTrace(g_mempool);
 
                 if (pindexMostWork == nullptr) {
                     pindexMostWork = FindMostWorkChain();
                 }
 
                 // Whether we have anything to do at all.
                 if (pindexMostWork == nullptr ||
                     pindexMostWork == chainActive.Tip()) {
                     break;
                 }
 
                 bool fInvalidFound = false;
                 std::shared_ptr<const CBlock> nullBlockPtr;
                 if (!ActivateBestChainStep(
                         config, state, pindexMostWork,
                         pblock && pblock->GetHash() ==
                                       pindexMostWork->GetBlockHash()
                             ? pblock
                             : nullBlockPtr,
                         fInvalidFound, connectTrace)) {
                     return false;
                 }
                 blocks_connected = true;
 
                 if (fInvalidFound) {
                     // Wipe cache, we may need another branch now.
                     pindexMostWork = nullptr;
                 }
 
                 pindexNewTip = chainActive.Tip();
                 for (const PerBlockConnectTrace &trace :
                      connectTrace.GetBlocksConnected()) {
                     assert(trace.pblock && trace.pindex);
                     GetMainSignals().BlockConnected(trace.pblock, trace.pindex,
                                                     trace.conflictedTxs);
                 }
             } while (!chainActive.Tip() ||
                      (starting_tip && CBlockIndexWorkComparator()(
                                           chainActive.Tip(), starting_tip)));
 
             if (!blocks_connected) {
                 return true;
             }
 
             const CBlockIndex *pindexFork = chainActive.FindFork(starting_tip);
             bool fInitialDownload = IsInitialBlockDownload();
 
             // Notify external listeners about the new tip.
             // Enqueue while holding cs_main to ensure that UpdatedBlockTip is
             // called in the order in which blocks are connected
             if (pindexFork != pindexNewTip) {
                 // Notify ValidationInterface subscribers
                 GetMainSignals().UpdatedBlockTip(pindexNewTip, pindexFork,
                                                  fInitialDownload);
 
                 // Always notify the UI if a new block tip was connected
                 uiInterface.NotifyBlockTip(fInitialDownload, pindexNewTip);
             }
         }
         // When we reach this point, we switched to a new tip (stored in
         // pindexNewTip).
 
         if (nStopAtHeight && pindexNewTip &&
             pindexNewTip->nHeight >= nStopAtHeight) {
             StartShutdown();
         }
 
         // We check shutdown only after giving ActivateBestChainStep a chance to
         // run once so that we never shutdown before connecting the genesis
         // block during LoadChainTip(). Previously this caused an assert()
         // failure during shutdown in such cases as the UTXO DB flushing checks
         // that the best block hash is non-null.
         if (ShutdownRequested()) {
             break;
         }
     } while (pindexNewTip != pindexMostWork);
 
     const CChainParams &params = config.GetChainParams();
     CheckBlockIndex(params.GetConsensus());
 
     // Write changes periodically to disk, after relay.
     if (!FlushStateToDisk(params, state, FlushStateMode::PERIODIC)) {
         return false;
     }
 
     return true;
 }
 
 bool ActivateBestChain(const Config &config, CValidationState &state,
                        std::shared_ptr<const CBlock> pblock) {
     return g_chainstate.ActivateBestChain(config, state, std::move(pblock));
 }
 
 bool CChainState::PreciousBlock(const Config &config, CValidationState &state,
                                 CBlockIndex *pindex) {
     {
         LOCK(cs_main);
         if (pindex->nChainWork < chainActive.Tip()->nChainWork) {
             // Nothing to do, this block is not at the tip.
             return true;
         }
 
         if (chainActive.Tip()->nChainWork > nLastPreciousChainwork) {
             // The chain has been extended since the last call, reset the
             // counter.
             nBlockReverseSequenceId = -1;
         }
 
         nLastPreciousChainwork = chainActive.Tip()->nChainWork;
         setBlockIndexCandidates.erase(pindex);
         pindex->nSequenceId = nBlockReverseSequenceId;
         if (nBlockReverseSequenceId > std::numeric_limits<int32_t>::min()) {
             // We can't keep reducing the counter if somebody really wants to
             // call preciousblock 2**31-1 times on the same set of tips...
             nBlockReverseSequenceId--;
         }
 
         // In case this was parked, unpark it.
         UnparkBlock(pindex);
 
         // Make sure it is added to the candidate list if appropriate.
         if (pindex->IsValid(BlockValidity::TRANSACTIONS) && pindex->nChainTx) {
             setBlockIndexCandidates.insert(pindex);
             PruneBlockIndexCandidates();
         }
     }
 
     return ActivateBestChain(config, state);
 }
 
 bool PreciousBlock(const Config &config, CValidationState &state,
                    CBlockIndex *pindex) {
     return g_chainstate.PreciousBlock(config, state, pindex);
 }
 
 bool CChainState::UnwindBlock(const Config &config, CValidationState &state,
                               CBlockIndex *pindex, bool invalidate) {
     AssertLockHeld(cs_main);
 
     // We first disconnect backwards and then mark the blocks as invalid.
     // This prevents a case where pruned nodes may fail to invalidateblock
     // and be left unable to start as they have no tip candidates (as there
     // are no blocks that meet the "have data and are not invalid per
     // nStatus" criteria for inclusion in setBlockIndexCandidates).
 
     bool pindex_was_in_chain = false;
     CBlockIndex *invalid_walk_tip = chainActive.Tip();
 
     DisconnectedBlockTransactions disconnectpool;
     while (chainActive.Contains(pindex)) {
         pindex_was_in_chain = true;
         // ActivateBestChain considers blocks already in chainActive
         // unconditionally valid already, so force disconnect away from it.
         if (!DisconnectTip(config, state, &disconnectpool)) {
             // It's probably hopeless to try to make the mempool consistent
             // here if DisconnectTip failed, but we can try.
             disconnectpool.updateMempoolForReorg(config, false);
             return false;
         }
     }
 
     // Now mark the blocks we just disconnected as descendants invalid
     // (note this may not be all descendants).
     while (pindex_was_in_chain && invalid_walk_tip != pindex) {
         invalid_walk_tip->nStatus =
             invalidate ? invalid_walk_tip->nStatus.withFailedParent()
                        : invalid_walk_tip->nStatus.withParkedParent();
         setDirtyBlockIndex.insert(invalid_walk_tip);
         invalid_walk_tip = invalid_walk_tip->pprev;
     }
 
     // Mark the block as either invalid or parked.
     pindex->nStatus = invalidate ? pindex->nStatus.withFailed()
                                  : pindex->nStatus.withParked();
     setDirtyBlockIndex.insert(pindex);
     if (invalidate) {
         m_failed_blocks.insert(pindex);
     }
 
     // DisconnectTip will add transactions to disconnectpool; try to add these
     // back to the mempool.
     disconnectpool.updateMempoolForReorg(config, true);
 
     // The resulting new best tip may not be in setBlockIndexCandidates anymore,
     // so add it again.
     for (const std::pair<const uint256, CBlockIndex *> &it : mapBlockIndex) {
         CBlockIndex *i = it.second;
         if (i->IsValid(BlockValidity::TRANSACTIONS) && i->nChainTx &&
             !setBlockIndexCandidates.value_comp()(i, chainActive.Tip())) {
             setBlockIndexCandidates.insert(i);
         }
     }
 
     if (invalidate) {
         InvalidChainFound(pindex);
     }
 
     // Only notify about a new block tip if the active chain was modified.
     if (pindex_was_in_chain) {
         uiInterface.NotifyBlockTip(IsInitialBlockDownload(), pindex->pprev);
     }
     return true;
 }
 
 bool FinalizeBlockAndInvalidate(const Config &config, CValidationState &state,
                                 CBlockIndex *pindex)
     EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
     AssertLockHeld(cs_main);
     if (!FinalizeBlockInternal(config, state, pindex)) {
         // state is set by FinalizeBlockInternal.
         return false;
     }
 
     // We have a valid candidate, make sure it is not parked.
     if (pindex->nStatus.isOnParkedChain()) {
         UnparkBlock(pindex);
     }
 
     // If the finalized block is not on the active chain, we need to rewind.
     if (!AreOnTheSameFork(pindex, chainActive.Tip())) {
         const CBlockIndex *pindexFork = chainActive.FindFork(pindex);
         CBlockIndex *pindexToInvalidate =
             chainActive.Tip()->GetAncestor(pindexFork->nHeight + 1);
         return InvalidateBlock(config, state, pindexToInvalidate);
     }
 
     return true;
 }
 
 bool InvalidateBlock(const Config &config, CValidationState &state,
                      CBlockIndex *pindex) {
     return g_chainstate.UnwindBlock(config, state, pindex, true);
 }
 
 bool ParkBlock(const Config &config, CValidationState &state,
                CBlockIndex *pindex) {
     return g_chainstate.UnwindBlock(config, state, pindex, false);
 }
 
 template <typename F>
 void CChainState::UpdateFlagsForBlock(CBlockIndex *pindexBase,
                                       CBlockIndex *pindex, F f) {
     BlockStatus newStatus = f(pindex->nStatus);
     if (pindex->nStatus != newStatus &&
         pindex->GetAncestor(pindexBase->nHeight) == pindexBase) {
         pindex->nStatus = newStatus;
         setDirtyBlockIndex.insert(pindex);
         if (newStatus.isValid()) {
             m_failed_blocks.erase(pindex);
         }
 
         if (pindex->IsValid(BlockValidity::TRANSACTIONS) && pindex->nChainTx &&
             setBlockIndexCandidates.value_comp()(chainActive.Tip(), pindex)) {
             setBlockIndexCandidates.insert(pindex);
         }
     }
 }
 
 template <typename F, typename C>
 void CChainState::UpdateFlags(CBlockIndex *pindex, F f, C fchild)
     EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
     AssertLockHeld(cs_main);
 
     // Update the current block.
     UpdateFlagsForBlock(pindex, pindex, f);
 
     // Update the flags from this block and all its descendants.
     BlockMap::iterator it = mapBlockIndex.begin();
     while (it != mapBlockIndex.end()) {
         UpdateFlagsForBlock(pindex, it->second, fchild);
         it++;
     }
 
     // Update the flags from all ancestors too.
     while (pindex != nullptr) {
         BlockStatus newStatus = f(pindex->nStatus);
         if (pindex->nStatus != newStatus) {
             pindex->nStatus = newStatus;
             setDirtyBlockIndex.insert(pindex);
             if (newStatus.isValid()) {
                 m_failed_blocks.erase(pindex);
             }
         }
         pindex = pindex->pprev;
     }
 }
 
 template <typename F>
 void CChainState::UpdateFlags(CBlockIndex *pindex, F f)
     EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
     // Handy shorthand.
     UpdateFlags(pindex, f, f);
 }
 
 bool CChainState::ResetBlockFailureFlags(CBlockIndex *pindex) {
     AssertLockHeld(cs_main);
 
     if (pindexBestInvalid &&
         (pindexBestInvalid->GetAncestor(pindex->nHeight) == pindex ||
          pindex->GetAncestor(pindexBestInvalid->nHeight) ==
              pindexBestInvalid)) {
         // Reset the invalid block marker if it is about to be cleared.
         pindexBestInvalid = nullptr;
     }
 
     // In case we are reconsidering something before the finalization point,
     // move the finalization point to the last common ancestor.
     if (pindexFinalized) {
         pindexFinalized = LastCommonAncestor(pindex, pindexFinalized);
     }
 
     UpdateFlags(pindex, [](const BlockStatus status) {
         return status.withClearedFailureFlags();
     });
 
     return true;
 }
 
 bool ResetBlockFailureFlags(CBlockIndex *pindex) {
     return g_chainstate.ResetBlockFailureFlags(pindex);
 }
 
 bool CChainState::UnparkBlockImpl(CBlockIndex *pindex, bool fClearChildren) {
     AssertLockHeld(cs_main);
 
     if (pindexBestParked &&
         (pindexBestParked->GetAncestor(pindex->nHeight) == pindex ||
          pindex->GetAncestor(pindexBestParked->nHeight) == pindexBestParked)) {
         // Reset the parked block marker if it is about to be cleared.
         pindexBestParked = nullptr;
     }
 
     UpdateFlags(pindex,
                 [](const BlockStatus status) {
                     return status.withClearedParkedFlags();
                 },
                 [fClearChildren](const BlockStatus status) {
                     return fClearChildren ? status.withClearedParkedFlags()
                                           : status.withParkedParent(false);
                 });
 
     return true;
 }
 
 bool UnparkBlockAndChildren(CBlockIndex *pindex) {
     return g_chainstate.UnparkBlockImpl(pindex, true);
 }
 
 bool UnparkBlock(CBlockIndex *pindex) {
     return g_chainstate.UnparkBlockImpl(pindex, false);
 }
 
 const CBlockIndex *GetFinalizedBlock() {
     AssertLockHeld(cs_main);
     return pindexFinalized;
 }
 
 bool IsBlockFinalized(const CBlockIndex *pindex) {
     AssertLockHeld(cs_main);
     return pindexFinalized &&
            pindexFinalized->GetAncestor(pindex->nHeight) == pindex;
 }
 
 CBlockIndex *CChainState::AddToBlockIndex(const CBlockHeader &block)
     EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
     AssertLockHeld(cs_main);
 
     // Check for duplicate
     uint256 hash = block.GetHash();
     BlockMap::iterator it = mapBlockIndex.find(hash);
     if (it != mapBlockIndex.end()) {
         return it->second;
     }
 
     // Construct new block index object
     CBlockIndex *pindexNew = new CBlockIndex(block);
     // We assign the sequence id to blocks only when the full data is available,
     // to avoid miners withholding blocks but broadcasting headers, to get a
     // competitive advantage.
     pindexNew->nSequenceId = 0;
     BlockMap::iterator mi =
         mapBlockIndex.insert(std::make_pair(hash, pindexNew)).first;
     pindexNew->phashBlock = &((*mi).first);
     BlockMap::iterator miPrev = mapBlockIndex.find(block.hashPrevBlock);
     if (miPrev != mapBlockIndex.end()) {
         pindexNew->pprev = (*miPrev).second;
         pindexNew->nHeight = pindexNew->pprev->nHeight + 1;
         pindexNew->BuildSkip();
     }
     pindexNew->nTimeReceived = GetTime();
     pindexNew->nTimeMax =
         (pindexNew->pprev
              ? std::max(pindexNew->pprev->nTimeMax, pindexNew->nTime)
              : pindexNew->nTime);
     pindexNew->nChainWork =
         (pindexNew->pprev ? pindexNew->pprev->nChainWork : 0) +
         GetBlockProof(*pindexNew);
     pindexNew->RaiseValidity(BlockValidity::TREE);
     if (pindexBestHeader == nullptr ||
         pindexBestHeader->nChainWork < pindexNew->nChainWork) {
         pindexBestHeader = pindexNew;
     }
 
     setDirtyBlockIndex.insert(pindexNew);
     return pindexNew;
 }
 
 /**
  * Mark a block as having its data received and checked (up to
  * BLOCK_VALID_TRANSACTIONS).
  */
 bool CChainState::ReceivedBlockTransactions(const CBlock &block,
                                             CValidationState &state,
                                             CBlockIndex *pindexNew,
                                             const FlatFilePos &pos) {
     pindexNew->nTx = block.vtx.size();
     pindexNew->nChainTx = 0;
     pindexNew->nFile = pos.nFile;
     pindexNew->nDataPos = pos.nPos;
     pindexNew->nUndoPos = 0;
     pindexNew->nStatus = pindexNew->nStatus.withData();
     pindexNew->RaiseValidity(BlockValidity::TRANSACTIONS);
     setDirtyBlockIndex.insert(pindexNew);
 
     if (pindexNew->pprev == nullptr || pindexNew->pprev->nChainTx) {
         // If pindexNew is the genesis block or all parents are
         // BLOCK_VALID_TRANSACTIONS.
         std::deque<CBlockIndex *> queue;
         queue.push_back(pindexNew);
 
         // Recursively process any descendant blocks that now may be eligible to
         // be connected.
         while (!queue.empty()) {
             CBlockIndex *pindex = queue.front();
             queue.pop_front();
             pindex->nChainTx =
                 (pindex->pprev ? pindex->pprev->nChainTx : 0) + pindex->nTx;
             if (pindex->nSequenceId == 0) {
                 // We assign a sequence is when transaction are received to
                 // prevent a miner from being able to broadcast a block but not
                 // its content. However, a sequence id may have been set
                 // manually, for instance via PreciousBlock, in which case, we
                 // don't need to assign one.
                 pindex->nSequenceId = nBlockSequenceId++;
             }
 
             if (chainActive.Tip() == nullptr ||
                 !setBlockIndexCandidates.value_comp()(pindex,
                                                       chainActive.Tip())) {
                 setBlockIndexCandidates.insert(pindex);
             }
 
             std::pair<std::multimap<CBlockIndex *, CBlockIndex *>::iterator,
                       std::multimap<CBlockIndex *, CBlockIndex *>::iterator>
                 range = mapBlocksUnlinked.equal_range(pindex);
             while (range.first != range.second) {
                 std::multimap<CBlockIndex *, CBlockIndex *>::iterator it =
                     range.first;
                 queue.push_back(it->second);
                 range.first++;
                 mapBlocksUnlinked.erase(it);
             }
         }
     } else if (pindexNew->pprev &&
                pindexNew->pprev->IsValid(BlockValidity::TREE)) {
         mapBlocksUnlinked.insert(std::make_pair(pindexNew->pprev, pindexNew));
     }
 
     return true;
 }
 
 static bool FindBlockPos(FlatFilePos &pos, unsigned int nAddSize,
                          unsigned int nHeight, uint64_t nTime,
                          bool fKnown = false) {
     LOCK(cs_LastBlockFile);
 
     unsigned int nFile = fKnown ? pos.nFile : nLastBlockFile;
     if (vinfoBlockFile.size() <= nFile) {
         vinfoBlockFile.resize(nFile + 1);
     }
 
     if (!fKnown) {
         while (vinfoBlockFile[nFile].nSize + nAddSize >= MAX_BLOCKFILE_SIZE) {
             nFile++;
             if (vinfoBlockFile.size() <= nFile) {
                 vinfoBlockFile.resize(nFile + 1);
             }
         }
         pos.nFile = nFile;
         pos.nPos = vinfoBlockFile[nFile].nSize;
     }
 
     if ((int)nFile != nLastBlockFile) {
         if (!fKnown) {
             LogPrintf("Leaving block file %i: %s\n", nLastBlockFile,
                       vinfoBlockFile[nLastBlockFile].ToString());
         }
         FlushBlockFile(!fKnown);
         nLastBlockFile = nFile;
     }
 
     vinfoBlockFile[nFile].AddBlock(nHeight, nTime);
     if (fKnown) {
         vinfoBlockFile[nFile].nSize =
             std::max(pos.nPos + nAddSize, vinfoBlockFile[nFile].nSize);
     } else {
         vinfoBlockFile[nFile].nSize += nAddSize;
     }
 
     if (!fKnown) {
         bool out_of_space;
         size_t bytes_allocated =
             BlockFileSeq().Allocate(pos, nAddSize, out_of_space);
         if (out_of_space) {
             return AbortNode("Disk space is low!",
                              _("Error: Disk space is low!"));
         }
         if (bytes_allocated != 0 && fPruneMode) {
             fCheckForPruning = true;
         }
     }
 
     setDirtyFileInfo.insert(nFile);
     return true;
 }
 
 static bool FindUndoPos(CValidationState &state, int nFile, FlatFilePos &pos,
                         unsigned int nAddSize) {
     pos.nFile = nFile;
 
     LOCK(cs_LastBlockFile);
 
     pos.nPos = vinfoBlockFile[nFile].nUndoSize;
     vinfoBlockFile[nFile].nUndoSize += nAddSize;
     setDirtyFileInfo.insert(nFile);
 
     bool out_of_space;
     size_t bytes_allocated =
         UndoFileSeq().Allocate(pos, nAddSize, out_of_space);
     if (out_of_space) {
         return AbortNode(state, "Disk space is low!",
                          _("Error: Disk space is low!"));
     }
     if (bytes_allocated != 0 && fPruneMode) {
         fCheckForPruning = true;
     }
 
     return true;
 }
 
 /**
  * Return true if the provided block header is valid.
  * Only verify PoW if blockValidationOptions is configured to do so.
  * This allows validation of headers on which the PoW hasn't been done.
  * For example: to validate template handed to mining software.
  * Do not call this for any check that depends on the context.
  * For context-dependent calls, see ContextualCheckBlockHeader.
  */
 static bool CheckBlockHeader(const CBlockHeader &block, CValidationState &state,
                              const Consensus::Params &params,
                              BlockValidationOptions validationOptions) {
     // Check proof of work matches claimed amount
     if (validationOptions.shouldValidatePoW() &&
         !CheckProofOfWork(block.GetHash(), block.nBits, params)) {
         return state.DoS(50, false, REJECT_INVALID, "high-hash", false,
                          "proof of work failed");
     }
 
     return true;
 }
 
 bool CheckBlock(const CBlock &block, CValidationState &state,
                 const Consensus::Params &params,
                 BlockValidationOptions validationOptions) {
     // These are checks that are independent of context.
     if (block.fChecked) {
         return true;
     }
 
     // Check that the header is valid (particularly PoW).  This is mostly
     // redundant with the call in AcceptBlockHeader.
     if (!CheckBlockHeader(block, state, params, validationOptions)) {
         return false;
     }
 
     // Check the merkle root.
     if (validationOptions.shouldValidateMerkleRoot()) {
         bool mutated;
         uint256 hashMerkleRoot2 = BlockMerkleRoot(block, &mutated);
         if (block.hashMerkleRoot != hashMerkleRoot2) {
             return state.DoS(100, false, REJECT_INVALID, "bad-txnmrklroot",
                              true, "hashMerkleRoot mismatch");
         }
 
         // Check for merkle tree malleability (CVE-2012-2459): repeating
         // sequences of transactions in a block without affecting the merkle
         // root of a block, while still invalidating it.
         if (mutated) {
             return state.DoS(100, false, REJECT_INVALID, "bad-txns-duplicate",
                              true, "duplicate transaction");
         }
     }
 
     // All potential-corruption validation must be done before we do any
     // transaction validation, as otherwise we may mark the header as invalid
     // because we receive the wrong transactions for it.
 
     // First transaction must be coinbase.
     if (block.vtx.empty()) {
         return state.DoS(100, false, REJECT_INVALID, "bad-cb-missing", false,
                          "first tx is not coinbase");
     }
 
     // Size limits.
     auto nMaxBlockSize = validationOptions.getExcessiveBlockSize();
 
     // Bail early if there is no way this block is of reasonable size.
     if ((block.vtx.size() * MIN_TRANSACTION_SIZE) > nMaxBlockSize) {
         return state.DoS(100, false, REJECT_INVALID, "bad-blk-length", false,
                          "size limits failed");
     }
 
     auto currentBlockSize =
         ::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION);
     if (currentBlockSize > nMaxBlockSize) {
         return state.DoS(100, false, REJECT_INVALID, "bad-blk-length", false,
                          "size limits failed");
     }
 
     // And a valid coinbase.
     if (!CheckCoinbase(*block.vtx[0], state)) {
         return state.Invalid(false, state.GetRejectCode(),
                              state.GetRejectReason(),
                              strprintf("Coinbase check failed (txid %s) %s",
                                        block.vtx[0]->GetId().ToString(),
                                        state.GetDebugMessage()));
     }
 
     // Keep track of the sigops count.
     uint64_t nSigOps = 0;
     auto nMaxSigOpsCount = GetMaxBlockSigOpsCount(currentBlockSize);
 
     // Check transactions
     auto txCount = block.vtx.size();
     auto *tx = block.vtx[0].get();
 
     size_t i = 0;
     while (true) {
         // Count the sigops for the current transaction. If the total sigops
         // count is too high, the the block is invalid.
         nSigOps += GetSigOpCountWithoutP2SH(*tx, STANDARD_SCRIPT_VERIFY_FLAGS);
         if (nSigOps > nMaxSigOpsCount) {
             return state.DoS(100, false, REJECT_INVALID, "bad-blk-sigops",
                              false, "out-of-bounds SigOpCount");
         }
 
         // Go to the next transaction.
         i++;
 
         // We reached the end of the block, success.
         if (i >= txCount) {
             break;
         }
 
         // Check that the transaction is valid. Because this check differs for
         // the coinbase, the loop is arranged such as this only runs after at
         // least one increment.
         tx = block.vtx[i].get();
         if (!CheckRegularTransaction(*tx, state)) {
             return state.Invalid(
                 false, state.GetRejectCode(), state.GetRejectReason(),
                 strprintf("Transaction check failed (txid %s) %s",
                           tx->GetId().ToString(), state.GetDebugMessage()));
         }
     }
 
     if (validationOptions.shouldValidatePoW() &&
         validationOptions.shouldValidateMerkleRoot()) {
         block.fChecked = true;
     }
 
     return true;
 }
 
 /**
  * Context-dependent validity checks.
  * By "context", we mean only the previous block headers, but not the UTXO
  * set; UTXO-related validity checks are done in ConnectBlock().
  * NOTE: This function is not currently invoked by ConnectBlock(), so we
  * should consider upgrade issues if we change which consensus rules are
  * enforced in this function (eg by adding a new consensus rule). See comment
  * in ConnectBlock().
  * Note that -reindex-chainstate skips the validation that happens here!
  */
 static bool ContextualCheckBlockHeader(const CChainParams &params,
                                        const CBlockHeader &block,
                                        CValidationState &state,
                                        const CBlockIndex *pindexPrev,
                                        int64_t nAdjustedTime) {
     assert(pindexPrev != nullptr);
     const int nHeight = pindexPrev->nHeight + 1;
 
     // Check proof of work
     const Consensus::Params &consensusParams = params.GetConsensus();
     if (block.nBits !=
         GetNextWorkRequired(pindexPrev, &block, consensusParams)) {
         LogPrintf("bad bits after height: %d\n", pindexPrev->nHeight);
         return state.DoS(100, false, REJECT_INVALID, "bad-diffbits", false,
                          "incorrect proof of work");
     }
 
     // Check against checkpoints
     if (fCheckpointsEnabled) {
         const CCheckpointData &checkpoints = params.Checkpoints();
 
         // Check that the block chain matches the known block chain up to a
         // checkpoint.
         if (!Checkpoints::CheckBlock(checkpoints, nHeight, block.GetHash())) {
             return state.DoS(100,
                              error("%s: rejected by checkpoint lock-in at %d",
                                    __func__, nHeight),
                              REJECT_CHECKPOINT, "checkpoint mismatch");
         }
 
         // Don't accept any forks from the main chain prior to last checkpoint.
         // GetLastCheckpoint finds the last checkpoint in MapCheckpoints that's
         // in our MapBlockIndex.
         CBlockIndex *pcheckpoint = Checkpoints::GetLastCheckpoint(checkpoints);
         if (pcheckpoint && nHeight < pcheckpoint->nHeight) {
             return state.DoS(
                 100,
                 error("%s: forked chain older than last checkpoint (height %d)",
                       __func__, nHeight),
                 REJECT_CHECKPOINT, "bad-fork-prior-to-checkpoint");
         }
     }
 
     // Check timestamp against prev
     if (block.GetBlockTime() <= pindexPrev->GetMedianTimePast()) {
         return state.Invalid(false, REJECT_INVALID, "time-too-old",
                              "block's timestamp is too early");
     }
 
     // Check timestamp
     if (block.GetBlockTime() > nAdjustedTime + MAX_FUTURE_BLOCK_TIME) {
         return state.Invalid(false, REJECT_INVALID, "time-too-new",
                              "block timestamp too far in the future");
     }
 
     // Reject outdated version blocks when 95% (75% on testnet) of the network
     // has upgraded:
     // check for version 2, 3 and 4 upgrades
     if ((block.nVersion < 2 && nHeight >= consensusParams.BIP34Height) ||
         (block.nVersion < 3 && nHeight >= consensusParams.BIP66Height) ||
         (block.nVersion < 4 && nHeight >= consensusParams.BIP65Height)) {
         return state.Invalid(
             false, REJECT_OBSOLETE,
             strprintf("bad-version(0x%08x)", block.nVersion),
             strprintf("rejected nVersion=0x%08x block", block.nVersion));
     }
 
     return true;
 }
 
 bool ContextualCheckTransactionForCurrentBlock(const Consensus::Params &params,
                                                const CTransaction &tx,
                                                CValidationState &state,
                                                int flags) {
     AssertLockHeld(cs_main);
 
     // By convention a negative value for flags indicates that the current
     // network-enforced consensus rules should be used. In a future soft-fork
     // scenario that would mean checking which rules would be enforced for the
     // next block and setting the appropriate flags. At the present time no
     // soft-forks are scheduled, so no flags are set.
     flags = std::max(flags, 0);
 
     // ContextualCheckTransactionForCurrentBlock() uses chainActive.Height()+1
     // to evaluate nLockTime because when IsFinalTx() is called within
     // CBlock::AcceptBlock(), the height of the block *being* evaluated is what
     // is used. Thus if we want to know if a transaction can be part of the
     // *next* block, we need to call ContextualCheckTransaction() with one more
     // than chainActive.Height().
     const int nBlockHeight = chainActive.Height() + 1;
 
     // BIP113 will require that time-locked transactions have nLockTime set to
     // less than the median time of the previous block they're contained in.
     // When the next block is created its previous block will be the current
     // chain tip, so we use that to calculate the median time passed to
     // ContextualCheckTransaction() if LOCKTIME_MEDIAN_TIME_PAST is set.
     const int64_t nMedianTimePast =
         chainActive.Tip() == nullptr ? 0
                                      : chainActive.Tip()->GetMedianTimePast();
     const int64_t nLockTimeCutoff = (flags & LOCKTIME_MEDIAN_TIME_PAST)
                                         ? nMedianTimePast
                                         : GetAdjustedTime();
 
     return ContextualCheckTransaction(params, tx, state, nBlockHeight,
                                       nLockTimeCutoff, nMedianTimePast);
 }
 
 /**
  * NOTE: This function is not currently invoked by ConnectBlock(), so we
  * should consider upgrade issues if we change which consensus rules are
  * enforced in this function (eg by adding a new consensus rule). See comment
  * in ConnectBlock().
  * Note that -reindex-chainstate skips the validation that happens here!
  */
 static bool ContextualCheckBlock(const CBlock &block, CValidationState &state,
                                  const Consensus::Params &params,
                                  const CBlockIndex *pindexPrev) {
     const int nHeight = pindexPrev == nullptr ? 0 : pindexPrev->nHeight + 1;
 
     // Start enforcing BIP113 (Median Time Past).
     int nLockTimeFlags = 0;
     if (nHeight >= params.CSVHeight) {
         nLockTimeFlags |= LOCKTIME_MEDIAN_TIME_PAST;
     }
 
     const int64_t nMedianTimePast =
         pindexPrev == nullptr ? 0 : pindexPrev->GetMedianTimePast();
 
     const int64_t nLockTimeCutoff = (nLockTimeFlags & LOCKTIME_MEDIAN_TIME_PAST)
                                         ? nMedianTimePast
                                         : block.GetBlockTime();
 
     const bool fIsMagneticAnomalyEnabled =
         IsMagneticAnomalyEnabled(params, pindexPrev);
 
     // Check that all transactions are finalized
     const CTransaction *prevTx = nullptr;
     for (const auto &ptx : block.vtx) {
         const CTransaction &tx = *ptx;
         if (fIsMagneticAnomalyEnabled) {
             if (prevTx && (tx.GetId() <= prevTx->GetId())) {
                 if (tx.GetId() == prevTx->GetId()) {
                     return state.DoS(100, false, REJECT_INVALID, "tx-duplicate",
                                      false,
                                      strprintf("Duplicated transaction %s",
                                                tx.GetId().ToString()));
                 }
 
                 return state.DoS(
                     100, false, REJECT_INVALID, "tx-ordering", false,
                     strprintf("Transaction order is invalid (%s < %s)",
                               tx.GetId().ToString(),
                               prevTx->GetId().ToString()));
             }
 
             if (prevTx || !tx.IsCoinBase()) {
                 prevTx = &tx;
             }
         }
 
         if (!ContextualCheckTransaction(params, tx, state, nHeight,
                                         nLockTimeCutoff, nMedianTimePast)) {
             // state set by ContextualCheckTransaction.
             return false;
         }
     }
 
     // Enforce rule that the coinbase starts with serialized block height
     if (nHeight >= params.BIP34Height) {
         CScript expect = CScript() << nHeight;
         if (block.vtx[0]->vin[0].scriptSig.size() < expect.size() ||
             !std::equal(expect.begin(), expect.end(),
                         block.vtx[0]->vin[0].scriptSig.begin())) {
             return state.DoS(100, false, REJECT_INVALID, "bad-cb-height", false,
                              "block height mismatch in coinbase");
         }
     }
 
     return true;
 }
 
 /**
  * If the provided block header is valid, add it to the block index.
  *
  * Returns true if the block is successfully added to the block index.
  */
 bool CChainState::AcceptBlockHeader(const Config &config,
                                     const CBlockHeader &block,
                                     CValidationState &state,
                                     CBlockIndex **ppindex) {
     AssertLockHeld(cs_main);
     const CChainParams &chainparams = config.GetChainParams();
 
     // Check for duplicate
     uint256 hash = block.GetHash();
     BlockMap::iterator miSelf = mapBlockIndex.find(hash);
     CBlockIndex *pindex = nullptr;
     if (hash != chainparams.GetConsensus().hashGenesisBlock) {
         if (miSelf != mapBlockIndex.end()) {
             // Block header is already known.
             pindex = miSelf->second;
             if (ppindex) {
                 *ppindex = pindex;
             }
 
             if (pindex->nStatus.isInvalid()) {
                 return state.Invalid(error("%s: block %s is marked invalid",
                                            __func__, hash.ToString()),
                                      0, "duplicate");
             }
 
             return true;
         }
 
         if (!CheckBlockHeader(block, state, chainparams.GetConsensus(),
                               BlockValidationOptions(config))) {
             return error("%s: Consensus::CheckBlockHeader: %s, %s", __func__,
                          hash.ToString(), FormatStateMessage(state));
         }
 
         // Get prev block index
         BlockMap::iterator mi = mapBlockIndex.find(block.hashPrevBlock);
         if (mi == mapBlockIndex.end()) {
             return state.DoS(10, error("%s: prev block not found", __func__), 0,
                              "prev-blk-not-found");
         }
 
         CBlockIndex *pindexPrev = (*mi).second;
         assert(pindexPrev);
         if (pindexPrev->nStatus.isInvalid()) {
             return state.DoS(100, error("%s: prev block invalid", __func__),
                              REJECT_INVALID, "bad-prevblk");
         }
 
         if (!ContextualCheckBlockHeader(chainparams, block, state, pindexPrev,
                                         GetAdjustedTime())) {
             return error("%s: Consensus::ContextualCheckBlockHeader: %s, %s",
                          __func__, hash.ToString(), FormatStateMessage(state));
         }
 
         if (!pindexPrev->IsValid(BlockValidity::SCRIPTS)) {
             for (const CBlockIndex *failedit : m_failed_blocks) {
                 if (pindexPrev->GetAncestor(failedit->nHeight) == failedit) {
                     assert(failedit->nStatus.hasFailed());
                     CBlockIndex *invalid_walk = pindexPrev;
                     while (invalid_walk != failedit) {
                         invalid_walk->nStatus =
                             invalid_walk->nStatus.withFailedParent();
                         setDirtyBlockIndex.insert(invalid_walk);
                         invalid_walk = invalid_walk->pprev;
                     }
                     return state.DoS(100,
                                      error("%s: prev block invalid", __func__),
                                      REJECT_INVALID, "bad-prevblk");
                 }
             }
         }
     }
 
     if (pindex == nullptr) {
         pindex = AddToBlockIndex(block);
     }
 
     if (ppindex) {
         *ppindex = pindex;
     }
 
     CheckBlockIndex(chainparams.GetConsensus());
     return true;
 }
 
 // Exposed wrapper for AcceptBlockHeader
 bool ProcessNewBlockHeaders(const Config &config,
                             const std::vector<CBlockHeader> &headers,
                             CValidationState &state,
                             const CBlockIndex **ppindex,
                             CBlockHeader *first_invalid) {
     if (first_invalid != nullptr) {
         first_invalid->SetNull();
     }
 
     {
         LOCK(cs_main);
         for (const CBlockHeader &header : headers) {
             // Use a temp pindex instead of ppindex to avoid a const_cast
             CBlockIndex *pindex = nullptr;
             if (!g_chainstate.AcceptBlockHeader(config, header, state,
                                                 &pindex)) {
                 if (first_invalid) {
                     *first_invalid = header;
                 }
                 return false;
             }
 
             if (ppindex) {
                 *ppindex = pindex;
             }
         }
     }
 
     NotifyHeaderTip();
     return true;
 }
 
 /**
  * Store block on disk. If dbp is non-nullptr, the file is known to already
  * reside on disk.
  */
 static FlatFilePos SaveBlockToDisk(const CBlock &block, int nHeight,
                                    const CChainParams &chainparams,
                                    const FlatFilePos *dbp) {
     unsigned int nBlockSize =
         ::GetSerializeSize(block, SER_DISK, CLIENT_VERSION);
     FlatFilePos blockPos;
     if (dbp != nullptr) {
         blockPos = *dbp;
     }
     if (!FindBlockPos(blockPos, nBlockSize + 8, nHeight, block.GetBlockTime(),
                       dbp != nullptr)) {
         error("%s: FindBlockPos failed", __func__);
         return FlatFilePos();
     }
     if (dbp == nullptr) {
         if (!WriteBlockToDisk(block, blockPos, chainparams.DiskMagic())) {
             AbortNode("Failed to write block");
             return FlatFilePos();
         }
     }
     return blockPos;
 }
 
 /**
  * Store a block on disk.
  *
  * @param[in]     config     The global config.
  * @param[in-out] pblock     The block we want to accept.
  * @param[in]     fRequested A boolean to indicate if this block was requested
  *                           from our peers.
  * @param[in]     dbp        If non-null, the disk position of the block.
  * @param[in-out] fNewBlock  True if block was first received via this call.
  * @return True if the block is accepted as a valid block and written to disk.
  */
 bool CChainState::AcceptBlock(const Config &config,
                               const std::shared_ptr<const CBlock> &pblock,
                               CValidationState &state, bool fRequested,
                               const FlatFilePos *dbp, bool *fNewBlock) {
     AssertLockHeld(cs_main);
 
     const CBlock &block = *pblock;
     if (fNewBlock) {
         *fNewBlock = false;
     }
 
     CBlockIndex *pindex = nullptr;
     if (!AcceptBlockHeader(config, block, state, &pindex)) {
         return false;
     }
 
     // Try to process all requested blocks that we don't have, but only
     // process an unrequested block if it's new and has enough work to
     // advance our tip, and isn't too many blocks ahead.
     bool fAlreadyHave = pindex->nStatus.hasData();
 
     // TODO: deal better with return value and error conditions for duplicate
     // and unrequested blocks.
     if (fAlreadyHave) {
         return true;
     }
 
     // Compare block header timestamps and received times of the block and the
     // chaintip.  If they have the same chain height, use these diffs as a
     // tie-breaker, attempting to pick the more honestly-mined block.
     int64_t newBlockTimeDiff = std::llabs(pindex->GetReceivedTimeDiff());
     int64_t chainTipTimeDiff =
         chainActive.Tip() ? std::llabs(chainActive.Tip()->GetReceivedTimeDiff())
                           : 0;
 
     bool isSameHeight = chainActive.Tip() &&
                         (pindex->nChainWork == chainActive.Tip()->nChainWork);
     if (isSameHeight) {
         LogPrintf("Chain tip timestamp-to-received-time difference: hash=%s, "
                   "diff=%d\n",
                   chainActive.Tip()->GetBlockHash().ToString(),
                   chainTipTimeDiff);
         LogPrintf("New block timestamp-to-received-time difference: hash=%s, "
                   "diff=%d\n",
                   pindex->GetBlockHash().ToString(), newBlockTimeDiff);
     }
 
     bool fHasMoreOrSameWork =
         (chainActive.Tip() ? pindex->nChainWork >= chainActive.Tip()->nChainWork
                            : true);
 
     // Blocks that are too out-of-order needlessly limit the effectiveness of
     // pruning, because pruning will not delete block files that contain any
     // blocks which are too close in height to the tip.  Apply this test
     // regardless of whether pruning is enabled; it should generally be safe to
     // not process unrequested blocks.
     bool fTooFarAhead =
         (pindex->nHeight > int(chainActive.Height() + MIN_BLOCKS_TO_KEEP));
 
     // TODO: Decouple this function from the block download logic by removing
     // fRequested
     // This requires some new chain data structure to efficiently look up if a
     // block is in a chain leading to a candidate for best tip, despite not
     // being such a candidate itself.
 
     // If we didn't ask for it:
     if (!fRequested) {
         // This is a previously-processed block that was pruned.
         if (pindex->nTx != 0) {
             return true;
         }
 
         // Don't process less-work chains.
         if (!fHasMoreOrSameWork) {
             return true;
         }
 
         // Block height is too high.
         if (fTooFarAhead) {
             return true;
         }
 
         // Protect against DoS attacks from low-work chains.
         // If our tip is behind, a peer could try to send us
         // low-work blocks on a fake chain that we would never
         // request; don't process these.
         if (pindex->nChainWork < nMinimumChainWork) {
             return true;
         }
     }
 
     const CChainParams &chainparams = config.GetChainParams();
 
     if (!CheckBlock(block, state, chainparams.GetConsensus(),
                     BlockValidationOptions(config)) ||
         !ContextualCheckBlock(block, state, chainparams.GetConsensus(),
                               pindex->pprev)) {
         if (state.IsInvalid() && !state.CorruptionPossible()) {
             pindex->nStatus = pindex->nStatus.withFailed();
             setDirtyBlockIndex.insert(pindex);
         }
 
         return error("%s: %s (block %s)", __func__, FormatStateMessage(state),
                      block.GetHash().ToString());
     }
 
     // If this is a deep reorg (a regorg of more than one block), preemptively
     // mark the chain as parked. If it has enough work, it'll unpark
     // automatically. We mark the block as parked at the very last minute so we
     // can make sure everything is ready to be reorged if needed.
     if (gArgs.GetBoolArg("-parkdeepreorg", true)) {
         const CBlockIndex *pindexFork = chainActive.FindFork(pindex);
         if (pindexFork && pindexFork->nHeight + 1 < pindex->nHeight) {
             LogPrintf("Park block %s as it would cause a deep reorg.\n",
                       pindex->GetBlockHash().ToString());
             pindex->nStatus = pindex->nStatus.withParked();
             setDirtyBlockIndex.insert(pindex);
         }
     }
 
     // Header is valid/has work and the merkle tree is good.
     // Relay now, but if it does not build on our best tip, let the
     // SendMessages loop relay it.
     if (!IsInitialBlockDownload() && chainActive.Tip() == pindex->pprev) {
         GetMainSignals().NewPoWValidBlock(pindex, pblock);
     }
 
     // Write block to history file
     if (fNewBlock) {
         *fNewBlock = true;
     }
     try {
         FlatFilePos blockPos =
             SaveBlockToDisk(block, pindex->nHeight, chainparams, dbp);
         if (blockPos.IsNull()) {
             state.Error(strprintf(
                 "%s: Failed to find position to write new block to disk",
                 __func__));
             return false;
         }
         if (!ReceivedBlockTransactions(block, state, pindex, blockPos)) {
             return error("AcceptBlock(): ReceivedBlockTransactions failed");
         }
     } catch (const std::runtime_error &e) {
         return AbortNode(state, std::string("System error: ") + e.what());
     }
 
     FlushStateToDisk(config.GetChainParams(), state, FlushStateMode::NONE);
 
     CheckBlockIndex(chainparams.GetConsensus());
 
     return true;
 }
 
 bool ProcessNewBlock(const Config &config,
                      const std::shared_ptr<const CBlock> pblock,
                      bool fForceProcessing, bool *fNewBlock) {
     AssertLockNotHeld(cs_main);
 
     {
         if (fNewBlock) {
             *fNewBlock = false;
         }
 
         CValidationState state;
 
         // CheckBlock() does not support multi-threaded block validation
         // because CBlock::fChecked can cause data race.
         // Therefore, the following critical section must include the
         // CheckBlock() call as well.
         LOCK(cs_main);
 
         // Ensure that CheckBlock() passes before calling AcceptBlock, as
         // belt-and-suspenders.
         bool ret =
             CheckBlock(*pblock, state, config.GetChainParams().GetConsensus(),
                        BlockValidationOptions(config));
         if (ret) {
             // Store to disk
             ret = g_chainstate.AcceptBlock(
                 config, pblock, state, fForceProcessing, nullptr, fNewBlock);
         }
 
         if (!ret) {
             GetMainSignals().BlockChecked(*pblock, state);
             return error("%s: AcceptBlock FAILED (%s)", __func__,
                          FormatStateMessage(state));
         }
     }
 
     NotifyHeaderTip();
 
     // Only used to report errors, not invalidity - ignore it
     CValidationState state;
     if (!g_chainstate.ActivateBestChain(config, state, pblock)) {
         return error("%s: ActivateBestChain failed (%s)", __func__,
                      FormatStateMessage(state));
     }
 
     return true;
 }
 
 bool TestBlockValidity(CValidationState &state, const CChainParams &params,
                        const CBlock &block, CBlockIndex *pindexPrev,
                        BlockValidationOptions validationOptions) {
     AssertLockHeld(cs_main);
     assert(pindexPrev && pindexPrev == chainActive.Tip());
     CCoinsViewCache viewNew(pcoinsTip.get());
     uint256 block_hash(block.GetHash());
     CBlockIndex indexDummy(block);
     indexDummy.pprev = pindexPrev;
     indexDummy.nHeight = pindexPrev->nHeight + 1;
     indexDummy.phashBlock = &block_hash;
 
     // NOTE: CheckBlockHeader is called by CheckBlock
     if (!ContextualCheckBlockHeader(params, block, state, pindexPrev,
                                     GetAdjustedTime())) {
         return error("%s: Consensus::ContextualCheckBlockHeader: %s", __func__,
                      FormatStateMessage(state));
     }
 
     if (!CheckBlock(block, state, params.GetConsensus(), validationOptions)) {
         return error("%s: Consensus::CheckBlock: %s", __func__,
                      FormatStateMessage(state));
     }
 
     if (!ContextualCheckBlock(block, state, params.GetConsensus(),
                               pindexPrev)) {
         return error("%s: Consensus::ContextualCheckBlock: %s", __func__,
                      FormatStateMessage(state));
     }
 
     if (!g_chainstate.ConnectBlock(block, state, &indexDummy, viewNew, params,
                                    validationOptions, true)) {
         return false;
     }
 
     assert(state.IsValid());
     return true;
 }
 
 /**
  * BLOCK PRUNING CODE
  */
 
 /**
  * Calculate the amount of disk space the block & undo files currently use.
  */
 uint64_t CalculateCurrentUsage() {
     LOCK(cs_LastBlockFile);
 
     uint64_t retval = 0;
     for (const CBlockFileInfo &file : vinfoBlockFile) {
         retval += file.nSize + file.nUndoSize;
     }
 
     return retval;
 }
 
 /**
  * Prune a block file (modify associated database entries)
  */
 void PruneOneBlockFile(const int fileNumber) {
     LOCK(cs_LastBlockFile);
 
     for (const auto &entry : mapBlockIndex) {
         CBlockIndex *pindex = entry.second;
         if (pindex->nFile == fileNumber) {
             pindex->nStatus = pindex->nStatus.withData(false).withUndo(false);
             pindex->nFile = 0;
             pindex->nDataPos = 0;
             pindex->nUndoPos = 0;
             setDirtyBlockIndex.insert(pindex);
 
             // Prune from mapBlocksUnlinked -- any block we prune would have
             // to be downloaded again in order to consider its chain, at which
             // point it would be considered as a candidate for
             // mapBlocksUnlinked or setBlockIndexCandidates.
             std::pair<std::multimap<CBlockIndex *, CBlockIndex *>::iterator,
                       std::multimap<CBlockIndex *, CBlockIndex *>::iterator>
                 range = mapBlocksUnlinked.equal_range(pindex->pprev);
             while (range.first != range.second) {
                 std::multimap<CBlockIndex *, CBlockIndex *>::iterator _it =
                     range.first;
                 range.first++;
                 if (_it->second == pindex) {
                     mapBlocksUnlinked.erase(_it);
                 }
             }
         }
     }
 
     vinfoBlockFile[fileNumber].SetNull();
     setDirtyFileInfo.insert(fileNumber);
 }
 
 void UnlinkPrunedFiles(const std::set<int> &setFilesToPrune) {
     for (const int i : setFilesToPrune) {
         FlatFilePos pos(i, 0);
         fs::remove(BlockFileSeq().FileName(pos));
         fs::remove(UndoFileSeq().FileName(pos));
         LogPrintf("Prune: %s deleted blk/rev (%05u)\n", __func__, i);
     }
 }
 
 /**
  * Calculate the block/rev files to delete based on height specified by user
  * with RPC command pruneblockchain
  */
 static void FindFilesToPruneManual(std::set<int> &setFilesToPrune,
                                    int nManualPruneHeight) {
     assert(fPruneMode && nManualPruneHeight > 0);
 
     LOCK2(cs_main, cs_LastBlockFile);
     if (chainActive.Tip() == nullptr) {
         return;
     }
 
     // last block to prune is the lesser of (user-specified height,
     // MIN_BLOCKS_TO_KEEP from the tip)
     unsigned int nLastBlockWeCanPrune =
         std::min((unsigned)nManualPruneHeight,
                  chainActive.Tip()->nHeight - MIN_BLOCKS_TO_KEEP);
     int count = 0;
     for (int fileNumber = 0; fileNumber < nLastBlockFile; fileNumber++) {
         if (vinfoBlockFile[fileNumber].nSize == 0 ||
             vinfoBlockFile[fileNumber].nHeightLast > nLastBlockWeCanPrune) {
             continue;
         }
         PruneOneBlockFile(fileNumber);
         setFilesToPrune.insert(fileNumber);
         count++;
     }
     LogPrintf("Prune (Manual): prune_height=%d removed %d blk/rev pairs\n",
               nLastBlockWeCanPrune, count);
 }
 
 /* This function is called from the RPC code for pruneblockchain */
 void PruneBlockFilesManual(int nManualPruneHeight) {
     CValidationState state;
     const CChainParams &chainparams = Params();
     if (!FlushStateToDisk(chainparams, state, FlushStateMode::NONE,
                           nManualPruneHeight)) {
         LogPrintf("%s: failed to flush state (%s)\n", __func__,
                   FormatStateMessage(state));
     }
 }
 
 /**
  * Prune block and undo files (blk???.dat and undo???.dat) so that the disk
  * space used is less than a user-defined target. The user sets the target (in
  * MB) on the command line or in config file.  This will be run on startup and
  * whenever new space is allocated in a block or undo file, staying below the
  * target. Changing back to unpruned requires a reindex (which in this case
  * means the blockchain must be re-downloaded.)
  *
  * Pruning functions are called from FlushStateToDisk when the global
  * fCheckForPruning flag has been set. Block and undo files are deleted in
  * lock-step (when blk00003.dat is deleted, so is rev00003.dat.). Pruning cannot
  * take place until the longest chain is at least a certain length (100000 on
  * mainnet, 1000 on testnet, 1000 on regtest). Pruning will never delete a block
  * within a defined distance (currently 288) from the active chain's tip. The
  * block index is updated by unsetting HAVE_DATA and HAVE_UNDO for any blocks
  * that were stored in the deleted files. A db flag records the fact that at
  * least some block files have been pruned.
  *
  * @param[out]   setFilesToPrune   The set of file indices that can be unlinked
  * will be returned
  */
 static void FindFilesToPrune(std::set<int> &setFilesToPrune,
                              uint64_t nPruneAfterHeight) {
     LOCK2(cs_main, cs_LastBlockFile);
     if (chainActive.Tip() == nullptr || nPruneTarget == 0) {
         return;
     }
     if (uint64_t(chainActive.Tip()->nHeight) <= nPruneAfterHeight) {
         return;
     }
 
     unsigned int nLastBlockWeCanPrune =
         chainActive.Tip()->nHeight - MIN_BLOCKS_TO_KEEP;
     uint64_t nCurrentUsage = CalculateCurrentUsage();
     // We don't check to prune until after we've allocated new space for files,
     // so we should leave a buffer under our target to account for another
     // allocation before the next pruning.
     uint64_t nBuffer = BLOCKFILE_CHUNK_SIZE + UNDOFILE_CHUNK_SIZE;
     uint64_t nBytesToPrune;
     int count = 0;
 
     if (nCurrentUsage + nBuffer >= nPruneTarget) {
         // On a prune event, the chainstate DB is flushed.
         // To avoid excessive prune events negating the benefit of high dbcache
         // values, we should not prune too rapidly.
         // So when pruning in IBD, increase the buffer a bit to avoid a re-prune
         // too soon.
         if (IsInitialBlockDownload()) {
             // Since this is only relevant during IBD, we use a fixed 10%
             nBuffer += nPruneTarget / 10;
         }
 
         for (int fileNumber = 0; fileNumber < nLastBlockFile; fileNumber++) {
             nBytesToPrune = vinfoBlockFile[fileNumber].nSize +
                             vinfoBlockFile[fileNumber].nUndoSize;
 
             if (vinfoBlockFile[fileNumber].nSize == 0) {
                 continue;
             }
 
             // are we below our target?
             if (nCurrentUsage + nBuffer < nPruneTarget) {
                 break;
             }
 
             // don't prune files that could have a block within
             // MIN_BLOCKS_TO_KEEP of the main chain's tip but keep scanning
             if (vinfoBlockFile[fileNumber].nHeightLast > nLastBlockWeCanPrune) {
                 continue;
             }
 
             PruneOneBlockFile(fileNumber);
             // Queue up the files for removal
             setFilesToPrune.insert(fileNumber);
             nCurrentUsage -= nBytesToPrune;
             count++;
         }
     }
 
     LogPrint(BCLog::PRUNE,
              "Prune: target=%dMiB actual=%dMiB diff=%dMiB "
              "max_prune_height=%d removed %d blk/rev pairs\n",
              nPruneTarget / 1024 / 1024, nCurrentUsage / 1024 / 1024,
              ((int64_t)nPruneTarget - (int64_t)nCurrentUsage) / 1024 / 1024,
              nLastBlockWeCanPrune, count);
 }
 
 static FlatFileSeq BlockFileSeq() {
     return FlatFileSeq(GetBlocksDir(), "blk", BLOCKFILE_CHUNK_SIZE);
 }
 
 static FlatFileSeq UndoFileSeq() {
     return FlatFileSeq(GetBlocksDir(), "rev", UNDOFILE_CHUNK_SIZE);
 }
 
 FILE *OpenBlockFile(const FlatFilePos &pos, bool fReadOnly) {
     return BlockFileSeq().Open(pos, fReadOnly);
 }
 
 /** Open an undo file (rev?????.dat) */
 static FILE *OpenUndoFile(const FlatFilePos &pos, bool fReadOnly) {
     return UndoFileSeq().Open(pos, fReadOnly);
 }
 
 fs::path GetBlockPosFilename(const FlatFilePos &pos) {
     return BlockFileSeq().FileName(pos);
 }
 
 CBlockIndex *CChainState::InsertBlockIndex(const uint256 &hash) {
     AssertLockHeld(cs_main);
 
     if (hash.IsNull()) {
         return nullptr;
     }
 
     // Return existing
     BlockMap::iterator mi = mapBlockIndex.find(hash);
     if (mi != mapBlockIndex.end()) {
         return (*mi).second;
     }
 
     // Create new
     CBlockIndex *pindexNew = new CBlockIndex();
     mi = mapBlockIndex.insert(std::make_pair(hash, pindexNew)).first;
     pindexNew->phashBlock = &((*mi).first);
 
     return pindexNew;
 }
 
 bool CChainState::LoadBlockIndex(const Config &config,
                                  CBlockTreeDB &blocktree) {
     if (!blocktree.LoadBlockIndexGuts(config.GetChainParams().GetConsensus(),
                                       [this](const uint256 &hash) {
                                           return this->InsertBlockIndex(hash);
                                       })) {
         return false;
     }
 
     boost::this_thread::interruption_point();
 
     // Calculate nChainWork
     std::vector<std::pair<int, CBlockIndex *>> vSortedByHeight;
     vSortedByHeight.reserve(mapBlockIndex.size());
     for (const std::pair<const uint256, CBlockIndex *> &item : mapBlockIndex) {
         CBlockIndex *pindex = item.second;
         vSortedByHeight.push_back(std::make_pair(pindex->nHeight, pindex));
     }
 
     sort(vSortedByHeight.begin(), vSortedByHeight.end());
     for (const std::pair<int, CBlockIndex *> &item : vSortedByHeight) {
         CBlockIndex *pindex = item.second;
         pindex->nChainWork = (pindex->pprev ? pindex->pprev->nChainWork : 0) +
                              GetBlockProof(*pindex);
         pindex->nTimeMax =
             (pindex->pprev ? std::max(pindex->pprev->nTimeMax, pindex->nTime)
                            : pindex->nTime);
         // We can link the chain of blocks for which we've received transactions
         // at some point. Pruned nodes may have deleted the block.
         if (pindex->nTx > 0) {
             if (pindex->pprev) {
                 if (pindex->pprev->nChainTx) {
                     pindex->nChainTx = pindex->pprev->nChainTx + pindex->nTx;
                 } else {
                     pindex->nChainTx = 0;
                     mapBlocksUnlinked.insert(
                         std::make_pair(pindex->pprev, pindex));
                 }
             } else {
                 pindex->nChainTx = pindex->nTx;
             }
         }
 
         if (!pindex->nStatus.hasFailed() && pindex->pprev &&
             pindex->pprev->nStatus.hasFailed()) {
             pindex->nStatus = pindex->nStatus.withFailedParent();
             setDirtyBlockIndex.insert(pindex);
         }
         if (pindex->IsValid(BlockValidity::TRANSACTIONS) &&
             (pindex->nChainTx || pindex->pprev == nullptr)) {
             setBlockIndexCandidates.insert(pindex);
         }
 
         if (pindex->nStatus.isInvalid() &&
             (!pindexBestInvalid ||
              pindex->nChainWork > pindexBestInvalid->nChainWork)) {
             pindexBestInvalid = pindex;
         }
 
         if (pindex->nStatus.isOnParkedChain() &&
             (!pindexBestParked ||
              pindex->nChainWork > pindexBestParked->nChainWork)) {
             pindexBestParked = pindex;
         }
 
         if (pindex->pprev) {
             pindex->BuildSkip();
         }
 
         if (pindex->IsValid(BlockValidity::TREE) &&
             (pindexBestHeader == nullptr ||
              CBlockIndexWorkComparator()(pindexBestHeader, pindex))) {
             pindexBestHeader = pindex;
         }
     }
 
     return true;
 }
 
 bool static LoadBlockIndexDB(const Config &config) {
     if (!g_chainstate.LoadBlockIndex(config, *pblocktree)) {
         return false;
     }
 
     // Load block file info
     pblocktree->ReadLastBlockFile(nLastBlockFile);
     vinfoBlockFile.resize(nLastBlockFile + 1);
     LogPrintf("%s: last block file = %i\n", __func__, nLastBlockFile);
     for (int nFile = 0; nFile <= nLastBlockFile; nFile++) {
         pblocktree->ReadBlockFileInfo(nFile, vinfoBlockFile[nFile]);
     }
 
     LogPrintf("%s: last block file info: %s\n", __func__,
               vinfoBlockFile[nLastBlockFile].ToString());
 
     for (int nFile = nLastBlockFile + 1; true; nFile++) {
         CBlockFileInfo info;
         if (pblocktree->ReadBlockFileInfo(nFile, info)) {
             vinfoBlockFile.push_back(info);
         } else {
             break;
         }
     }
 
     // Check presence of blk files
     LogPrintf("Checking all blk files are present...\n");
     std::set<int> setBlkDataFiles;
     for (const std::pair<const uint256, CBlockIndex *> &item : mapBlockIndex) {
         CBlockIndex *pindex = item.second;
         if (pindex->nStatus.hasData()) {
             setBlkDataFiles.insert(pindex->nFile);
         }
     }
 
     for (const int i : setBlkDataFiles) {
         FlatFilePos pos(i, 0);
         if (CAutoFile(OpenBlockFile(pos, true), SER_DISK, CLIENT_VERSION)
                 .IsNull()) {
             return false;
         }
     }
 
     // Check whether we have ever pruned block & undo files
     pblocktree->ReadFlag("prunedblockfiles", fHavePruned);
     if (fHavePruned) {
         LogPrintf(
             "LoadBlockIndexDB(): Block files have previously been pruned\n");
     }
 
     // Check whether we need to continue reindexing
     bool fReindexing = false;
     pblocktree->ReadReindexing(fReindexing);
     if (fReindexing) {
         fReindex = true;
     }
 
     return true;
 }
 
 bool LoadChainTip(const Config &config) {
     AssertLockHeld(cs_main);
 
     if (chainActive.Tip() &&
         chainActive.Tip()->GetBlockHash() == pcoinsTip->GetBestBlock()) {
         return true;
     }
 
     if (pcoinsTip->GetBestBlock().IsNull() && mapBlockIndex.size() == 1) {
         // In case we just added the genesis block, connect it now, so
         // that we always have a chainActive.Tip() when we return.
         LogPrintf("%s: Connecting genesis block...\n", __func__);
         CValidationState state;
         if (!ActivateBestChain(config, state)) {
             LogPrintf("%s: failed to activate chain (%s)\n", __func__,
                       FormatStateMessage(state));
             return false;
         }
     }
 
     // Load pointer to end of best chain
     CBlockIndex *pindex = LookupBlockIndex(pcoinsTip->GetBestBlock());
     if (!pindex) {
         return false;
     }
     chainActive.SetTip(pindex);
 
     g_chainstate.PruneBlockIndexCandidates();
 
     LogPrintf(
         "Loaded best chain: hashBestChain=%s height=%d date=%s progress=%f\n",
         chainActive.Tip()->GetBlockHash().ToString(), chainActive.Height(),
         FormatISO8601DateTime(chainActive.Tip()->GetBlockTime()),
         GuessVerificationProgress(config.GetChainParams().TxData(),
                                   chainActive.Tip()));
     return true;
 }
 
 CVerifyDB::CVerifyDB() {
     uiInterface.ShowProgress(_("Verifying blocks..."), 0, false);
 }
 
 CVerifyDB::~CVerifyDB() {
     uiInterface.ShowProgress("", 100, false);
 }
 
 bool CVerifyDB::VerifyDB(const Config &config, CCoinsView *coinsview,
                          int nCheckLevel, int nCheckDepth) {
     LOCK(cs_main);
 
     const CChainParams &params = config.GetChainParams();
     const Consensus::Params &consensusParams = params.GetConsensus();
 
     if (chainActive.Tip() == nullptr || chainActive.Tip()->pprev == nullptr) {
         return true;
     }
 
     // Verify blocks in the best chain
     if (nCheckDepth <= 0 || nCheckDepth > chainActive.Height()) {
         nCheckDepth = chainActive.Height();
     }
 
     nCheckLevel = std::max(0, std::min(4, nCheckLevel));
     LogPrintf("Verifying last %i blocks at level %i\n", nCheckDepth,
               nCheckLevel);
 
     CCoinsViewCache coins(coinsview);
     CBlockIndex *pindex;
     CBlockIndex *pindexFailure = nullptr;
     int nGoodTransactions = 0;
     CValidationState state;
     int reportDone = 0;
     LogPrintfToBeContinued("[0%%]...");
     for (pindex = chainActive.Tip(); pindex && pindex->pprev;
          pindex = pindex->pprev) {
         boost::this_thread::interruption_point();
         int percentageDone = std::max(
             1, std::min(
                    99,
                    (int)(((double)(chainActive.Height() - pindex->nHeight)) /
                          (double)nCheckDepth * (nCheckLevel >= 4 ? 50 : 100))));
 
         if (reportDone < percentageDone / 10) {
             // report every 10% step
             LogPrintfToBeContinued("[%d%%]...", percentageDone);
             reportDone = percentageDone / 10;
         }
 
         uiInterface.ShowProgress(_("Verifying blocks..."), percentageDone,
                                  false);
         if (pindex->nHeight <= chainActive.Height() - nCheckDepth) {
             break;
         }
 
         if (fPruneMode && !pindex->nStatus.hasData()) {
             // If pruning, only go back as far as we have data.
             LogPrintf("VerifyDB(): block verification stopping at height %d "
                       "(pruning, no data)\n",
                       pindex->nHeight);
             break;
         }
 
         CBlock block;
 
         // check level 0: read from disk
         if (!ReadBlockFromDisk(block, pindex, consensusParams)) {
             return error(
                 "VerifyDB(): *** ReadBlockFromDisk failed at %d, hash=%s",
                 pindex->nHeight, pindex->GetBlockHash().ToString());
         }
 
         // check level 1: verify block validity
         if (nCheckLevel >= 1 && !CheckBlock(block, state, consensusParams,
                                             BlockValidationOptions(config))) {
             return error("%s: *** found bad block at %d, hash=%s (%s)\n",
                          __func__, pindex->nHeight,
                          pindex->GetBlockHash().ToString(),
                          FormatStateMessage(state));
         }
 
         // check level 2: verify undo validity
         if (nCheckLevel >= 2 && pindex) {
             CBlockUndo undo;
             if (!pindex->GetUndoPos().IsNull()) {
                 if (!UndoReadFromDisk(undo, pindex)) {
                     return error(
                         "VerifyDB(): *** found bad undo data at %d, hash=%s\n",
                         pindex->nHeight, pindex->GetBlockHash().ToString());
                 }
             }
         }
 
         // check level 3: check for inconsistencies during memory-only
         // disconnect of tip blocks
         if (nCheckLevel >= 3 &&
             (coins.DynamicMemoryUsage() + pcoinsTip->DynamicMemoryUsage()) <=
                 nCoinCacheUsage) {
             assert(coins.GetBestBlock() == pindex->GetBlockHash());
             DisconnectResult res =
                 g_chainstate.DisconnectBlock(block, pindex, coins);
             if (res == DISCONNECT_FAILED) {
                 return error("VerifyDB(): *** irrecoverable inconsistency in "
                              "block data at %d, hash=%s",
                              pindex->nHeight,
                              pindex->GetBlockHash().ToString());
             }
 
             if (res == DISCONNECT_UNCLEAN) {
                 nGoodTransactions = 0;
                 pindexFailure = pindex;
             } else {
                 nGoodTransactions += block.vtx.size();
             }
         }
 
         if (ShutdownRequested()) {
             return true;
         }
     }
 
     if (pindexFailure) {
         return error("VerifyDB(): *** coin database inconsistencies found "
                      "(last %i blocks, %i good transactions before that)\n",
                      chainActive.Height() - pindexFailure->nHeight + 1,
                      nGoodTransactions);
     }
 
     // store block count as we move pindex at check level >= 4
     int block_count = chainActive.Height() - pindex->nHeight;
 
     // check level 4: try reconnecting blocks
     if (nCheckLevel >= 4) {
         while (pindex != chainActive.Tip()) {
             boost::this_thread::interruption_point();
             uiInterface.ShowProgress(
                 _("Verifying blocks..."),
                 std::max(
                     1, std::min(99, 100 - (int)(((double)(chainActive.Height() -
                                                           pindex->nHeight)) /
                                                 (double)nCheckDepth * 50))),
                 false);
             pindex = chainActive.Next(pindex);
             CBlock block;
             if (!ReadBlockFromDisk(block, pindex, consensusParams)) {
                 return error(
                     "VerifyDB(): *** ReadBlockFromDisk failed at %d, hash=%s",
                     pindex->nHeight, pindex->GetBlockHash().ToString());
             }
             if (!g_chainstate.ConnectBlock(block, state, pindex, coins, params,
                                            BlockValidationOptions(config))) {
                 return error("VerifyDB(): *** found unconnectable block at %d, "
                              "hash=%s (%s)",
                              pindex->nHeight, pindex->GetBlockHash().ToString(),
                              FormatStateMessage(state));
             }
         }
     }
 
     LogPrintf("[DONE].\n");
     LogPrintf("No coin database inconsistencies in last %i blocks (%i "
               "transactions)\n",
               block_count, nGoodTransactions);
 
     return true;
 }
 
 /**
  * Apply the effects of a block on the utxo cache, ignoring that it may already
  * have been applied.
  */
 bool CChainState::RollforwardBlock(const CBlockIndex *pindex,
                                    CCoinsViewCache &view,
                                    const Consensus::Params &params) {
     // TODO: merge with ConnectBlock
     CBlock block;
     if (!ReadBlockFromDisk(block, pindex, params)) {
         return error("ReplayBlock(): ReadBlockFromDisk failed at %d, hash=%s",
                      pindex->nHeight, pindex->GetBlockHash().ToString());
     }
 
     for (const CTransactionRef &tx : block.vtx) {
         // Pass check = true as every addition may be an overwrite.
         AddCoins(view, *tx, pindex->nHeight, true);
     }
 
     for (const CTransactionRef &tx : block.vtx) {
         if (tx->IsCoinBase()) {
             continue;
         }
 
         for (const CTxIn &txin : tx->vin) {
             view.SpendCoin(txin.prevout);
         }
     }
 
     return true;
 }
 
 bool CChainState::ReplayBlocks(const Consensus::Params &params,
                                CCoinsView *view) {
     LOCK(cs_main);
 
     CCoinsViewCache cache(view);
 
     std::vector<uint256> hashHeads = view->GetHeadBlocks();
     if (hashHeads.empty()) {
         // We're already in a consistent state.
         return true;
     }
 
     if (hashHeads.size() != 2) {
         return error("ReplayBlocks(): unknown inconsistent state");
     }
 
     uiInterface.ShowProgress(_("Replaying blocks..."), 0, false);
     LogPrintf("Replaying blocks\n");
 
     // Old tip during the interrupted flush.
     const CBlockIndex *pindexOld = nullptr;
     // New tip during the interrupted flush.
     const CBlockIndex *pindexNew;
     // Latest block common to both the old and the new tip.
     const CBlockIndex *pindexFork = nullptr;
 
     if (mapBlockIndex.count(hashHeads[0]) == 0) {
         return error(
             "ReplayBlocks(): reorganization to unknown block requested");
     }
 
     pindexNew = mapBlockIndex[hashHeads[0]];
 
     if (!hashHeads[1].IsNull()) {
         // The old tip is allowed to be 0, indicating it's the first flush.
         if (mapBlockIndex.count(hashHeads[1]) == 0) {
             return error(
                 "ReplayBlocks(): reorganization from unknown block requested");
         }
 
         pindexOld = mapBlockIndex[hashHeads[1]];
         pindexFork = LastCommonAncestor(pindexOld, pindexNew);
         assert(pindexFork != nullptr);
     }
 
     // Rollback along the old branch.
     while (pindexOld != pindexFork) {
         if (pindexOld->nHeight > 0) {
             // Never disconnect the genesis block.
             CBlock block;
             if (!ReadBlockFromDisk(block, pindexOld, params)) {
                 return error("RollbackBlock(): ReadBlockFromDisk() failed at "
                              "%d, hash=%s",
                              pindexOld->nHeight,
                              pindexOld->GetBlockHash().ToString());
             }
 
             LogPrintf("Rolling back %s (%i)\n",
                       pindexOld->GetBlockHash().ToString(), pindexOld->nHeight);
             DisconnectResult res = DisconnectBlock(block, pindexOld, cache);
             if (res == DISCONNECT_FAILED) {
                 return error(
                     "RollbackBlock(): DisconnectBlock failed at %d, hash=%s",
                     pindexOld->nHeight, pindexOld->GetBlockHash().ToString());
             }
 
             // If DISCONNECT_UNCLEAN is returned, it means a non-existing UTXO
             // was deleted, or an existing UTXO was overwritten. It corresponds
             // to cases where the block-to-be-disconnect never had all its
             // operations applied to the UTXO set. However, as both writing a
             // UTXO and deleting a UTXO are idempotent operations, the result is
             // still a version of the UTXO set with the effects of that block
             // undone.
         }
         pindexOld = pindexOld->pprev;
     }
 
     // Roll forward from the forking point to the new tip.
     int nForkHeight = pindexFork ? pindexFork->nHeight : 0;
     for (int nHeight = nForkHeight + 1; nHeight <= pindexNew->nHeight;
          ++nHeight) {
         const CBlockIndex *pindex = pindexNew->GetAncestor(nHeight);
         LogPrintf("Rolling forward %s (%i)\n",
                   pindex->GetBlockHash().ToString(), nHeight);
         if (!RollforwardBlock(pindex, cache, params)) {
             return false;
         }
     }
 
     cache.SetBestBlock(pindexNew->GetBlockHash());
     cache.Flush();
     uiInterface.ShowProgress("", 100, false);
     return true;
 }
 
 bool ReplayBlocks(const Consensus::Params &params, CCoinsView *view) {
     return g_chainstate.ReplayBlocks(params, view);
 }
 
 bool CChainState::RewindBlockIndex(const Config &config) {
     LOCK(cs_main);
 
     const CChainParams &params = config.GetChainParams();
     int nHeight = chainActive.Height() + 1;
 
     // nHeight is now the height of the first insufficiently-validated block, or
     // tipheight + 1
     CValidationState state;
     CBlockIndex *pindex = chainActive.Tip();
     while (chainActive.Height() >= nHeight) {
         if (fPruneMode && !chainActive.Tip()->nStatus.hasData()) {
             // If pruning, don't try rewinding past the HAVE_DATA point; since
             // older blocks can't be served anyway, there's no need to walk
             // further, and trying to DisconnectTip() will fail (and require a
             // needless reindex/redownload of the blockchain).
             break;
         }
 
         if (!DisconnectTip(config, state, nullptr)) {
             return error("RewindBlockIndex: unable to disconnect block at "
                          "height %i (%s)",
                          pindex->nHeight, FormatStateMessage(state));
         }
 
         // Occasionally flush state to disk.
         if (!FlushStateToDisk(params, state, FlushStateMode::PERIODIC)) {
             LogPrintf("RewindBlockIndex: unable to flush state to disk (%s)\n",
                       FormatStateMessage(state));
             return false;
         }
     }
 
     // Reduce validity flag and have-data flags.
     // We do this after actual disconnecting, otherwise we'll end up writing the
     // lack of data to disk before writing the chainstate, resulting in a
     // failure to continue if interrupted.
     for (const auto &entry : mapBlockIndex) {
         CBlockIndex *pindexIter = entry.second;
         if (pindexIter->IsValid(BlockValidity::TRANSACTIONS) &&
             pindexIter->nChainTx) {
             setBlockIndexCandidates.insert(pindexIter);
         }
     }
 
     if (chainActive.Tip() != nullptr) {
         // We can't prune block index candidates based on our tip if we have
         // no tip due to chainActive being empty!
         PruneBlockIndexCandidates();
 
         CheckBlockIndex(params.GetConsensus());
     }
 
     return true;
 }
 
 bool RewindBlockIndex(const Config &config) {
     if (!g_chainstate.RewindBlockIndex(config)) {
         return false;
     }
 
     if (chainActive.Tip() != nullptr) {
         // FlushStateToDisk can possibly read chainActive. Be conservative
         // and skip it here, we're about to -reindex-chainstate anyway, so
         // it'll get called a bunch real soon.
         CValidationState state;
         if (!FlushStateToDisk(config.GetChainParams(), state,
                               FlushStateMode::ALWAYS)) {
             LogPrintf("RewindBlockIndex: unable to flush state to disk (%s)\n",
                       FormatStateMessage(state));
             return false;
         }
     }
 
     return true;
 }
 
 // May NOT be used after any connections are up as much of the peer-processing
 // logic assumes a consistent block index state
 void CChainState::UnloadBlockIndex() {
     nBlockSequenceId = 1;
     m_failed_blocks.clear();
     setBlockIndexCandidates.clear();
 }
 
 // May NOT be used after any connections are up as much
 // of the peer-processing logic assumes a consistent
 // block index state
 void UnloadBlockIndex() {
     LOCK(cs_main);
     chainActive.SetTip(nullptr);
     pindexFinalized = nullptr;
     pindexBestInvalid = nullptr;
     pindexBestParked = nullptr;
     pindexBestHeader = nullptr;
     pindexBestForkTip = nullptr;
     pindexBestForkBase = nullptr;
     g_mempool.clear();
     mapBlocksUnlinked.clear();
     vinfoBlockFile.clear();
     nLastBlockFile = 0;
     setDirtyBlockIndex.clear();
     setDirtyFileInfo.clear();
 
     for (BlockMap::value_type &entry : mapBlockIndex) {
         delete entry.second;
     }
 
     mapBlockIndex.clear();
     fHavePruned = false;
 
     g_chainstate.UnloadBlockIndex();
 }
 
 bool LoadBlockIndex(const Config &config) {
     // Load block index from databases
     bool needs_init = fReindex;
     if (!fReindex) {
         bool ret = LoadBlockIndexDB(config);
         if (!ret) {
             return false;
         }
 
         needs_init = mapBlockIndex.empty();
     }
 
     if (needs_init) {
         // Everything here is for *new* reindex/DBs. Thus, though
         // LoadBlockIndexDB may have set fReindex if we shut down
         // mid-reindex previously, we don't check fReindex and
         // instead only check it prior to LoadBlockIndexDB to set
         // needs_init.
 
         LogPrintf("Initializing databases...\n");
     }
     return true;
 }
 
 bool CChainState::LoadGenesisBlock(const CChainParams &chainparams) {
     LOCK(cs_main);
 
     // Check whether we're already initialized by checking for genesis in
     // mapBlockIndex. Note that we can't use chainActive here, since it is
     // set based on the coins db, not the block index db, which is the only
     // thing loaded at this point.
     if (mapBlockIndex.count(chainparams.GenesisBlock().GetHash())) {
         return true;
     }
 
     try {
         CBlock &block = const_cast<CBlock &>(chainparams.GenesisBlock());
         FlatFilePos blockPos = SaveBlockToDisk(block, 0, chainparams, nullptr);
         if (blockPos.IsNull()) {
             return error("%s: writing genesis block to disk failed", __func__);
         }
         CBlockIndex *pindex = AddToBlockIndex(block);
         CValidationState state;
         if (!ReceivedBlockTransactions(block, state, pindex, blockPos)) {
             return error("%s: genesis block not accepted (%s)", __func__,
                          FormatStateMessage(state));
         }
     } catch (const std::runtime_error &e) {
         return error("%s: failed to write genesis block: %s", __func__,
                      e.what());
     }
 
     return true;
 }
 
 bool LoadGenesisBlock(const CChainParams &chainparams) {
     return g_chainstate.LoadGenesisBlock(chainparams);
 }
 
 bool LoadExternalBlockFile(const Config &config, FILE *fileIn,
                            FlatFilePos *dbp) {
     // Map of disk positions for blocks with unknown parent (only used for
     // reindex)
     static std::multimap<uint256, FlatFilePos> mapBlocksUnknownParent;
     int64_t nStart = GetTimeMillis();
 
     const CChainParams &chainparams = config.GetChainParams();
 
     int nLoaded = 0;
     try {
         // This takes over fileIn and calls fclose() on it in the CBufferedFile
         // destructor. Make sure we have at least 2*MAX_TX_SIZE space in there
         // so any transaction can fit in the buffer.
         CBufferedFile blkdat(fileIn, 2 * MAX_TX_SIZE, MAX_TX_SIZE + 8, SER_DISK,
                              CLIENT_VERSION);
         uint64_t nRewind = blkdat.GetPos();
         while (!blkdat.eof()) {
             boost::this_thread::interruption_point();
 
             blkdat.SetPos(nRewind);
             // Start one byte further next time, in case of failure.
             nRewind++;
             // Remove former limit.
             blkdat.SetLimit();
             unsigned int nSize = 0;
             try {
                 // Locate a header.
                 uint8_t buf[CMessageHeader::MESSAGE_START_SIZE];
                 blkdat.FindByte(chainparams.DiskMagic()[0]);
                 nRewind = blkdat.GetPos() + 1;
                 blkdat >> FLATDATA(buf);
                 if (memcmp(buf, std::begin(chainparams.DiskMagic()),
                            CMessageHeader::MESSAGE_START_SIZE)) {
                     continue;
                 }
 
                 // Read size.
                 blkdat >> nSize;
                 if (nSize < 80) {
                     continue;
                 }
             } catch (const std::exception &) {
                 // No valid block header found; don't complain.
                 break;
             }
 
             try {
                 // read block
                 uint64_t nBlockPos = blkdat.GetPos();
                 if (dbp) {
                     dbp->nPos = nBlockPos;
                 }
                 blkdat.SetLimit(nBlockPos + nSize);
                 blkdat.SetPos(nBlockPos);
                 std::shared_ptr<CBlock> pblock = std::make_shared<CBlock>();
                 CBlock &block = *pblock;
                 blkdat >> block;
                 nRewind = blkdat.GetPos();
 
                 uint256 hash = block.GetHash();
                 {
                     LOCK(cs_main);
                     // detect out of order blocks, and store them for later
                     if (hash != chainparams.GetConsensus().hashGenesisBlock &&
                         !LookupBlockIndex(block.hashPrevBlock)) {
                         LogPrint(
                             BCLog::REINDEX,
                             "%s: Out of order block %s, parent %s not known\n",
                             __func__, hash.ToString(),
                             block.hashPrevBlock.ToString());
                         if (dbp) {
                             mapBlocksUnknownParent.insert(
                                 std::make_pair(block.hashPrevBlock, *dbp));
                         }
                         continue;
                     }
 
                     // process in case the block isn't known yet
                     CBlockIndex *pindex = LookupBlockIndex(hash);
                     if (!pindex || !pindex->nStatus.hasData()) {
                         CValidationState state;
                         if (g_chainstate.AcceptBlock(config, pblock, state,
                                                      true, dbp, nullptr)) {
                             nLoaded++;
                         }
                         if (state.IsError()) {
                             break;
                         }
                     } else if (hash != chainparams.GetConsensus()
                                            .hashGenesisBlock &&
                                pindex->nHeight % 1000 == 0) {
                         LogPrint(
                             BCLog::REINDEX,
                             "Block Import: already had block %s at height %d\n",
                             hash.ToString(), pindex->nHeight);
                     }
                 }
 
                 // Activate the genesis block so normal node progress can
                 // continue
                 if (hash == chainparams.GetConsensus().hashGenesisBlock) {
                     CValidationState state;
                     if (!ActivateBestChain(config, state)) {
                         break;
                     }
                 }
 
                 NotifyHeaderTip();
 
                 // Recursively process earlier encountered successors of this
                 // block
                 std::deque<uint256> queue;
                 queue.push_back(hash);
                 while (!queue.empty()) {
                     uint256 head = queue.front();
                     queue.pop_front();
                     std::pair<std::multimap<uint256, FlatFilePos>::iterator,
                               std::multimap<uint256, FlatFilePos>::iterator>
                         range = mapBlocksUnknownParent.equal_range(head);
                     while (range.first != range.second) {
                         std::multimap<uint256, FlatFilePos>::iterator it =
                             range.first;
                         std::shared_ptr<CBlock> pblockrecursive =
                             std::make_shared<CBlock>();
                         if (ReadBlockFromDisk(*pblockrecursive, it->second,
                                               chainparams.GetConsensus())) {
                             LogPrint(
                                 BCLog::REINDEX,
                                 "%s: Processing out of order child %s of %s\n",
                                 __func__, pblockrecursive->GetHash().ToString(),
                                 head.ToString());
                             LOCK(cs_main);
                             CValidationState dummy;
                             if (g_chainstate.AcceptBlock(
                                     config, pblockrecursive, dummy, true,
                                     &it->second, nullptr)) {
                                 nLoaded++;
                                 queue.push_back(pblockrecursive->GetHash());
                             }
                         }
                         range.first++;
                         mapBlocksUnknownParent.erase(it);
                         NotifyHeaderTip();
                     }
                 }
             } catch (const std::exception &e) {
                 LogPrintf("%s: Deserialize or I/O error - %s\n", __func__,
                           e.what());
             }
         }
     } catch (const std::runtime_error &e) {
         AbortNode(std::string("System error: ") + e.what());
     }
 
     if (nLoaded > 0) {
         LogPrintf("Loaded %i blocks from external file in %dms\n", nLoaded,
                   GetTimeMillis() - nStart);
     }
 
     return nLoaded > 0;
 }
 
 void CChainState::CheckBlockIndex(const Consensus::Params &consensusParams) {
     if (!fCheckBlockIndex) {
         return;
     }
 
     LOCK(cs_main);
 
     // During a reindex, we read the genesis block and call CheckBlockIndex
     // before ActivateBestChain, so we have the genesis block in mapBlockIndex
     // but no active chain. (A few of the tests when iterating the block tree
     // require that chainActive has been initialized.)
     if (chainActive.Height() < 0) {
         assert(mapBlockIndex.size() <= 1);
         return;
     }
 
     // Build forward-pointing map of the entire block tree.
     std::multimap<CBlockIndex *, CBlockIndex *> forward;
     for (auto &entry : mapBlockIndex) {
         forward.emplace(entry.second->pprev, entry.second);
     }
 
     assert(forward.size() == mapBlockIndex.size());
 
     std::pair<std::multimap<CBlockIndex *, CBlockIndex *>::iterator,
               std::multimap<CBlockIndex *, CBlockIndex *>::iterator>
         rangeGenesis = forward.equal_range(nullptr);
     CBlockIndex *pindex = rangeGenesis.first->second;
     rangeGenesis.first++;
     // There is only one index entry with parent nullptr.
     assert(rangeGenesis.first == rangeGenesis.second);
 
     // Iterate over the entire block tree, using depth-first search.
     // Along the way, remember whether there are blocks on the path from genesis
     // block being explored which are the first to have certain properties.
     size_t nNodes = 0;
     int nHeight = 0;
     // Oldest ancestor of pindex which is invalid.
     CBlockIndex *pindexFirstInvalid = nullptr;
     // Oldest ancestor of pindex which is parked.
     CBlockIndex *pindexFirstParked = nullptr;
     // Oldest ancestor of pindex which does not have data available.
     CBlockIndex *pindexFirstMissing = nullptr;
     // Oldest ancestor of pindex for which nTx == 0.
     CBlockIndex *pindexFirstNeverProcessed = nullptr;
     // Oldest ancestor of pindex which does not have BLOCK_VALID_TREE
     // (regardless of being valid or not).
     CBlockIndex *pindexFirstNotTreeValid = nullptr;
     // Oldest ancestor of pindex which does not have BLOCK_VALID_TRANSACTIONS
     // (regardless of being valid or not).
     CBlockIndex *pindexFirstNotTransactionsValid = nullptr;
     // Oldest ancestor of pindex which does not have BLOCK_VALID_CHAIN
     // (regardless of being valid or not).
     CBlockIndex *pindexFirstNotChainValid = nullptr;
     // Oldest ancestor of pindex which does not have BLOCK_VALID_SCRIPTS
     // (regardless of being valid or not).
     CBlockIndex *pindexFirstNotScriptsValid = nullptr;
     while (pindex != nullptr) {
         nNodes++;
         if (pindexFirstInvalid == nullptr && pindex->nStatus.hasFailed()) {
             pindexFirstInvalid = pindex;
         }
         if (pindexFirstParked == nullptr && pindex->nStatus.isParked()) {
             pindexFirstParked = pindex;
         }
         if (pindexFirstMissing == nullptr && !pindex->nStatus.hasData()) {
             pindexFirstMissing = pindex;
         }
         if (pindexFirstNeverProcessed == nullptr && pindex->nTx == 0) {
             pindexFirstNeverProcessed = pindex;
         }
         if (pindex->pprev != nullptr && pindexFirstNotTreeValid == nullptr &&
             pindex->nStatus.getValidity() < BlockValidity::TREE) {
             pindexFirstNotTreeValid = pindex;
         }
         if (pindex->pprev != nullptr &&
             pindexFirstNotTransactionsValid == nullptr &&
             pindex->nStatus.getValidity() < BlockValidity::TRANSACTIONS) {
             pindexFirstNotTransactionsValid = pindex;
         }
         if (pindex->pprev != nullptr && pindexFirstNotChainValid == nullptr &&
             pindex->nStatus.getValidity() < BlockValidity::CHAIN) {
             pindexFirstNotChainValid = pindex;
         }
         if (pindex->pprev != nullptr && pindexFirstNotScriptsValid == nullptr &&
             pindex->nStatus.getValidity() < BlockValidity::SCRIPTS) {
             pindexFirstNotScriptsValid = pindex;
         }
 
         // Begin: actual consistency checks.
         if (pindex->pprev == nullptr) {
             // Genesis block checks.
             // Genesis block's hash must match.
             assert(pindex->GetBlockHash() == consensusParams.hashGenesisBlock);
             // The current active chain's genesis block must be this block.
             assert(pindex == chainActive.Genesis());
         }
         if (pindex->nChainTx == 0) {
             // nSequenceId can't be set positive for blocks that aren't linked
             // (negative is used for preciousblock)
             assert(pindex->nSequenceId <= 0);
         }
         // VALID_TRANSACTIONS is equivalent to nTx > 0 for all nodes (whether or
         // not pruning has occurred). HAVE_DATA is only equivalent to nTx > 0
         // (or VALID_TRANSACTIONS) if no pruning has occurred.
         if (!fHavePruned) {
             // If we've never pruned, then HAVE_DATA should be equivalent to nTx
             // > 0
             assert(pindex->nStatus.hasData() == (pindex->nTx > 0));
             assert(pindexFirstMissing == pindexFirstNeverProcessed);
         } else if (pindex->nStatus.hasData()) {
             // If we have pruned, then we can only say that HAVE_DATA implies
             // nTx > 0
             assert(pindex->nTx > 0);
         }
         if (pindex->nStatus.hasUndo()) {
             assert(pindex->nStatus.hasData());
         }
         // This is pruning-independent.
         assert((pindex->nStatus.getValidity() >= BlockValidity::TRANSACTIONS) ==
                (pindex->nTx > 0));
         // All parents having had data (at some point) is equivalent to all
         // parents being VALID_TRANSACTIONS, which is equivalent to nChainTx
         // being set.
         // nChainTx != 0 is used to signal that all parent blocks have been
         // processed (but may have been pruned).
         assert((pindexFirstNeverProcessed != nullptr) ==
                (pindex->nChainTx == 0));
         assert((pindexFirstNotTransactionsValid != nullptr) ==
                (pindex->nChainTx == 0));
         // nHeight must be consistent.
         assert(pindex->nHeight == nHeight);
         // For every block except the genesis block, the chainwork must be
         // larger than the parent's.
         assert(pindex->pprev == nullptr ||
                pindex->nChainWork >= pindex->pprev->nChainWork);
         // The pskip pointer must point back for all but the first 2 blocks.
         assert(nHeight < 2 ||
                (pindex->pskip && (pindex->pskip->nHeight < nHeight)));
         // All mapBlockIndex entries must at least be TREE valid
         assert(pindexFirstNotTreeValid == nullptr);
         if (pindex->nStatus.getValidity() >= BlockValidity::TREE) {
             // TREE valid implies all parents are TREE valid
             assert(pindexFirstNotTreeValid == nullptr);
         }
         if (pindex->nStatus.getValidity() >= BlockValidity::CHAIN) {
             // CHAIN valid implies all parents are CHAIN valid
             assert(pindexFirstNotChainValid == nullptr);
         }
         if (pindex->nStatus.getValidity() >= BlockValidity::SCRIPTS) {
             // SCRIPTS valid implies all parents are SCRIPTS valid
             assert(pindexFirstNotScriptsValid == nullptr);
         }
         if (pindexFirstInvalid == nullptr) {
             // Checks for not-invalid blocks.
             // The failed mask cannot be set for blocks without invalid parents.
             assert(!pindex->nStatus.isInvalid());
         }
         if (pindexFirstParked == nullptr) {
             // Checks for not-invalid blocks.
             // The failed mask cannot be set for blocks without invalid parents.
             assert(!pindex->nStatus.isOnParkedChain());
         }
         if (!CBlockIndexWorkComparator()(pindex, chainActive.Tip()) &&
             pindexFirstNeverProcessed == nullptr) {
             if (pindexFirstInvalid == nullptr) {
                 // If this block sorts at least as good as the current tip and
                 // is valid and we have all data for its parents, it must be in
                 // setBlockIndexCandidates or be parked.
                 if (pindexFirstMissing == nullptr) {
                     assert(pindex->nStatus.isOnParkedChain() ||
                            setBlockIndexCandidates.count(pindex));
                 }
                 // chainActive.Tip() must also be there even if some data has
                 // been pruned.
                 if (pindex == chainActive.Tip()) {
                     assert(setBlockIndexCandidates.count(pindex));
                 }
                 // If some parent is missing, then it could be that this block
                 // was in setBlockIndexCandidates but had to be removed because
                 // of the missing data. In this case it must be in
                 // mapBlocksUnlinked -- see test below.
             }
         } else {
             // If this block sorts worse than the current tip or some ancestor's
             // block has never been seen, it cannot be in
             // setBlockIndexCandidates.
             assert(setBlockIndexCandidates.count(pindex) == 0);
         }
         // Check whether this block is in mapBlocksUnlinked.
         std::pair<std::multimap<CBlockIndex *, CBlockIndex *>::iterator,
                   std::multimap<CBlockIndex *, CBlockIndex *>::iterator>
             rangeUnlinked = mapBlocksUnlinked.equal_range(pindex->pprev);
         bool foundInUnlinked = false;
         while (rangeUnlinked.first != rangeUnlinked.second) {
             assert(rangeUnlinked.first->first == pindex->pprev);
             if (rangeUnlinked.first->second == pindex) {
                 foundInUnlinked = true;
                 break;
             }
             rangeUnlinked.first++;
         }
         if (pindex->pprev && pindex->nStatus.hasData() &&
             pindexFirstNeverProcessed != nullptr &&
             pindexFirstInvalid == nullptr) {
             // If this block has block data available, some parent was never
             // received, and has no invalid parents, it must be in
             // mapBlocksUnlinked.
             assert(foundInUnlinked);
         }
         if (!pindex->nStatus.hasData()) {
             // Can't be in mapBlocksUnlinked if we don't HAVE_DATA
             assert(!foundInUnlinked);
         }
         if (pindexFirstMissing == nullptr) {
             // We aren't missing data for any parent -- cannot be in
             // mapBlocksUnlinked.
             assert(!foundInUnlinked);
         }
         if (pindex->pprev && pindex->nStatus.hasData() &&
             pindexFirstNeverProcessed == nullptr &&
             pindexFirstMissing != nullptr) {
             // We HAVE_DATA for this block, have received data for all parents
             // at some point, but we're currently missing data for some parent.
             // We must have pruned.
             assert(fHavePruned);
             // This block may have entered mapBlocksUnlinked if:
             //  - it has a descendant that at some point had more work than the
             //    tip, and
             //  - we tried switching to that descendant but were missing
             //    data for some intermediate block between chainActive and the
             //    tip.
             // So if this block is itself better than chainActive.Tip() and it
             // wasn't in
             // setBlockIndexCandidates, then it must be in mapBlocksUnlinked.
             if (!CBlockIndexWorkComparator()(pindex, chainActive.Tip()) &&
                 setBlockIndexCandidates.count(pindex) == 0) {
                 if (pindexFirstInvalid == nullptr) {
                     assert(foundInUnlinked);
                 }
             }
         }
         // Perhaps too slow
         // assert(pindex->GetBlockHash() == pindex->GetBlockHeader().GetHash());
         // End: actual consistency checks.
 
         // Try descending into the first subnode.
         std::pair<std::multimap<CBlockIndex *, CBlockIndex *>::iterator,
                   std::multimap<CBlockIndex *, CBlockIndex *>::iterator>
             range = forward.equal_range(pindex);
         if (range.first != range.second) {
             // A subnode was found.
             pindex = range.first->second;
             nHeight++;
             continue;
         }
         // This is a leaf node. Move upwards until we reach a node of which we
         // have not yet visited the last child.
         while (pindex) {
             // We are going to either move to a parent or a sibling of pindex.
             // If pindex was the first with a certain property, unset the
             // corresponding variable.
             if (pindex == pindexFirstInvalid) {
                 pindexFirstInvalid = nullptr;
             }
             if (pindex == pindexFirstParked) {
                 pindexFirstParked = nullptr;
             }
             if (pindex == pindexFirstMissing) {
                 pindexFirstMissing = nullptr;
             }
             if (pindex == pindexFirstNeverProcessed) {
                 pindexFirstNeverProcessed = nullptr;
             }
             if (pindex == pindexFirstNotTreeValid) {
                 pindexFirstNotTreeValid = nullptr;
             }
             if (pindex == pindexFirstNotTransactionsValid) {
                 pindexFirstNotTransactionsValid = nullptr;
             }
             if (pindex == pindexFirstNotChainValid) {
                 pindexFirstNotChainValid = nullptr;
             }
             if (pindex == pindexFirstNotScriptsValid) {
                 pindexFirstNotScriptsValid = nullptr;
             }
             // Find our parent.
             CBlockIndex *pindexPar = pindex->pprev;
             // Find which child we just visited.
             std::pair<std::multimap<CBlockIndex *, CBlockIndex *>::iterator,
                       std::multimap<CBlockIndex *, CBlockIndex *>::iterator>
                 rangePar = forward.equal_range(pindexPar);
             while (rangePar.first->second != pindex) {
                 // Our parent must have at least the node we're coming from as
                 // child.
                 assert(rangePar.first != rangePar.second);
                 rangePar.first++;
             }
             // Proceed to the next one.
             rangePar.first++;
             if (rangePar.first != rangePar.second) {
                 // Move to the sibling.
                 pindex = rangePar.first->second;
                 break;
             } else {
                 // Move up further.
                 pindex = pindexPar;
                 nHeight--;
                 continue;
             }
         }
     }
 
     // Check that we actually traversed the entire map.
     assert(nNodes == forward.size());
 }
 
 std::string CBlockFileInfo::ToString() const {
     return strprintf(
         "CBlockFileInfo(blocks=%u, size=%u, heights=%u...%u, time=%s...%s)",
         nBlocks, nSize, nHeightFirst, nHeightLast,
         FormatISO8601DateTime(nTimeFirst), FormatISO8601DateTime(nTimeLast));
 }
 
 CBlockFileInfo *GetBlockFileInfo(size_t n) {
     LOCK(cs_LastBlockFile);
 
     return &vinfoBlockFile.at(n);
 }
 
 static const uint64_t MEMPOOL_DUMP_VERSION = 1;
 
 bool LoadMempool(const Config &config) {
     int64_t nExpiryTimeout =
         gArgs.GetArg("-mempoolexpiry", DEFAULT_MEMPOOL_EXPIRY) * 60 * 60;
     FILE *filestr = fsbridge::fopen(GetDataDir() / "mempool.dat", "rb");
     CAutoFile file(filestr, SER_DISK, CLIENT_VERSION);
     if (file.IsNull()) {
         LogPrintf(
             "Failed to open mempool file from disk. Continuing anyway.\n");
         return false;
     }
 
     int64_t count = 0;
     int64_t skipped = 0;
     int64_t failed = 0;
     int64_t nNow = GetTime();
 
     try {
         uint64_t version;
         file >> version;
         if (version != MEMPOOL_DUMP_VERSION) {
             return false;
         }
 
         uint64_t num;
         file >> num;
         double prioritydummy = 0;
         while (num--) {
             CTransactionRef tx;
             int64_t nTime;
             int64_t nFeeDelta;
             file >> tx;
             file >> nTime;
             file >> nFeeDelta;
 
             Amount amountdelta = nFeeDelta * SATOSHI;
             if (amountdelta != Amount::zero()) {
                 g_mempool.PrioritiseTransaction(tx->GetId(), prioritydummy,
                                                 amountdelta);
             }
             CValidationState state;
             if (nTime + nExpiryTimeout > nNow) {
                 LOCK(cs_main);
                 AcceptToMemoryPoolWithTime(
                     config, g_mempool, state, tx, true /* fLimitFree */,
                     nullptr /* pfMissingInputs */, nTime,
                     false /* fOverrideMempoolLimit */,
                     Amount::zero() /* nAbsurdFee */, false /* test_accept */);
                 if (state.IsValid()) {
                     ++count;
                 } else {
                     ++failed;
                 }
             } else {
                 ++skipped;
             }
 
             if (ShutdownRequested()) {
                 return false;
             }
         }
         std::map<uint256, Amount> mapDeltas;
         file >> mapDeltas;
 
         for (const auto &i : mapDeltas) {
             g_mempool.PrioritiseTransaction(i.first, prioritydummy, i.second);
         }
     } catch (const std::exception &e) {
         LogPrintf("Failed to deserialize mempool data on disk: %s. Continuing "
                   "anyway.\n",
                   e.what());
         return false;
     }
 
     LogPrintf("Imported mempool transactions from disk: %i successes, %i "
               "failed, %i expired\n",
               count, failed, skipped);
     return true;
 }
 
 bool DumpMempool() {
     int64_t start = GetTimeMicros();
 
     std::map<uint256, Amount> mapDeltas;
     std::vector<TxMempoolInfo> vinfo;
 
     static Mutex dump_mutex;
     LOCK(dump_mutex);
 
     {
         LOCK(g_mempool.cs);
         for (const auto &i : g_mempool.mapDeltas) {
             mapDeltas[i.first] = i.second.second;
         }
 
         vinfo = g_mempool.infoAll();
     }
 
     int64_t mid = GetTimeMicros();
 
     try {
         FILE *filestr = fsbridge::fopen(GetDataDir() / "mempool.dat.new", "wb");
         if (!filestr) {
             return false;
         }
 
         CAutoFile file(filestr, SER_DISK, CLIENT_VERSION);
 
         uint64_t version = MEMPOOL_DUMP_VERSION;
         file << version;
 
         file << uint64_t(vinfo.size());
         for (const auto &i : vinfo) {
             file << *(i.tx);
             file << int64_t(i.nTime);
             file << i.nFeeDelta;
             mapDeltas.erase(i.tx->GetId());
         }
 
         file << mapDeltas;
         if (!FileCommit(file.Get())) {
             throw std::runtime_error("FileCommit failed");
         }
         file.fclose();
         RenameOver(GetDataDir() / "mempool.dat.new",
                    GetDataDir() / "mempool.dat");
         int64_t last = GetTimeMicros();
         LogPrintf("Dumped mempool: %gs to copy, %gs to dump\n",
                   (mid - start) * MICRO, (last - mid) * MICRO);
     } catch (const std::exception &e) {
         LogPrintf("Failed to dump mempool: %s. Continuing anyway.\n", e.what());
         return false;
     }
     return true;
 }
 
 //! Guess how far we are in the verification process at the given block index
 //! require cs_main if pindex has not been validated yet (because nChainTx might
 //! be unset)
 double GuessVerificationProgress(const ChainTxData &data,
                                  const CBlockIndex *pindex) {
     if (pindex == nullptr) {
         return 0.0;
     }
 
     // This function assumes the lock on cs_main is already held (see the
     // above comment). This is a temporary check until PR15997 is backported.
     // https://github.com/bitcoin/bitcoin/pull/15997
     AssertLockHeld(cs_main);
 
     int64_t nNow = time(nullptr);
 
     double fTxTotal;
     if (pindex->nChainTx <= data.nTxCount) {
         fTxTotal = data.nTxCount + (nNow - data.nTime) * data.dTxRate;
     } else {
         fTxTotal =
             pindex->nChainTx + (nNow - pindex->GetBlockTime()) * data.dTxRate;
     }
 
     return pindex->nChainTx / fTxTotal;
 }
 
 class CMainCleanup {
 public:
     CMainCleanup() {}
     ~CMainCleanup() {
         // block headers
         for (const std::pair<const uint256, CBlockIndex *> &it :
              mapBlockIndex) {
             delete it.second;
         }
         mapBlockIndex.clear();
     }
 } instance_of_cmaincleanup;
diff --git a/src/validationinterface.cpp b/src/validationinterface.cpp
index ec588542e..ee3d38457 100644
--- a/src/validationinterface.cpp
+++ b/src/validationinterface.cpp
@@ -1,223 +1,231 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2016 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <validationinterface.h>
 
 #include <init.h>
 #include <scheduler.h>
 #include <txmempool.h>
 #include <util/system.h>
 #include <validation.h>
 
 #include <boost/signals2/signal.hpp>
 
 #include <atomic>
 #include <future>
 #include <list>
 
 struct ValidationInterfaceConnections {
     boost::signals2::scoped_connection UpdatedBlockTip;
     boost::signals2::scoped_connection TransactionAddedToMempool;
     boost::signals2::scoped_connection BlockConnected;
     boost::signals2::scoped_connection BlockDisconnected;
     boost::signals2::scoped_connection TransactionRemovedFromMempool;
     boost::signals2::scoped_connection ChainStateFlushed;
     boost::signals2::scoped_connection Broadcast;
     boost::signals2::scoped_connection BlockChecked;
     boost::signals2::scoped_connection NewPoWValidBlock;
 };
 
 struct MainSignalsInstance {
     boost::signals2::signal<void(const CBlockIndex *, const CBlockIndex *,
                                  bool fInitialDownload)>
         UpdatedBlockTip;
     boost::signals2::signal<void(const CTransactionRef &)>
         TransactionAddedToMempool;
     boost::signals2::signal<void(const std::shared_ptr<const CBlock> &,
                                  const CBlockIndex *pindex,
                                  const std::vector<CTransactionRef> &)>
         BlockConnected;
     boost::signals2::signal<void(const std::shared_ptr<const CBlock> &)>
         BlockDisconnected;
     boost::signals2::signal<void(const CTransactionRef &)>
         TransactionRemovedFromMempool;
     boost::signals2::signal<void(const CBlockLocator &)> ChainStateFlushed;
     boost::signals2::signal<void(int64_t nBestBlockTime, CConnman *connman)>
         Broadcast;
     boost::signals2::signal<void(const CBlock &, const CValidationState &)>
         BlockChecked;
     boost::signals2::signal<void(const CBlockIndex *,
                                  const std::shared_ptr<const CBlock> &)>
         NewPoWValidBlock;
 
     // We are not allowed to assume the scheduler only runs in one thread,
     // but must ensure all callbacks happen in-order, so we end up creating
     // our own queue here :(
     SingleThreadedSchedulerClient m_schedulerClient;
     std::unordered_map<CValidationInterface *, ValidationInterfaceConnections>
         m_connMainSignals;
 
     explicit MainSignalsInstance(CScheduler *pscheduler)
         : m_schedulerClient(pscheduler) {}
 };
 
 static CMainSignals g_signals;
 
 // This map has to be a separate global instead of a member of
 // MainSignalsInstance, because RegisterWithMempoolSignals is currently called
 // before RegisterBackgroundSignalScheduler, so MainSignalsInstance hasn't been
 // created yet.
 static std::unordered_map<CTxMemPool *, boost::signals2::scoped_connection>
     g_connNotifyEntryRemoved;
 
 void CMainSignals::RegisterBackgroundSignalScheduler(CScheduler &scheduler) {
     assert(!m_internals);
     m_internals.reset(new MainSignalsInstance(&scheduler));
 }
 
 void CMainSignals::UnregisterBackgroundSignalScheduler() {
     m_internals.reset(nullptr);
 }
 
 void CMainSignals::FlushBackgroundCallbacks() {
     if (m_internals) {
         m_internals->m_schedulerClient.EmptyQueue();
     }
 }
 
 size_t CMainSignals::CallbacksPending() {
     if (!m_internals) {
         return 0;
     }
     return m_internals->m_schedulerClient.CallbacksPending();
 }
 
 void CMainSignals::RegisterWithMempoolSignals(CTxMemPool &pool) {
     g_connNotifyEntryRemoved.emplace(
-        &pool, pool.NotifyEntryRemoved.connect(boost::bind(
-                   &CMainSignals::MempoolEntryRemoved, this, _1, _2)));
+        &pool, pool.NotifyEntryRemoved.connect(
+                   std::bind(&CMainSignals::MempoolEntryRemoved, this,
+                             std::placeholders::_1, std::placeholders::_2)));
 }
 
 void CMainSignals::UnregisterWithMempoolSignals(CTxMemPool &pool) {
     g_connNotifyEntryRemoved.erase(&pool);
 }
 
 CMainSignals &GetMainSignals() {
     return g_signals;
 }
 
 void RegisterValidationInterface(CValidationInterface *pwalletIn) {
     ValidationInterfaceConnections &conns =
         g_signals.m_internals->m_connMainSignals[pwalletIn];
-    conns.UpdatedBlockTip =
-        g_signals.m_internals->UpdatedBlockTip.connect(boost::bind(
-            &CValidationInterface::UpdatedBlockTip, pwalletIn, _1, _2, _3));
+    conns.UpdatedBlockTip = g_signals.m_internals->UpdatedBlockTip.connect(
+        std::bind(&CValidationInterface::UpdatedBlockTip, pwalletIn,
+                  std::placeholders::_1, std::placeholders::_2,
+                  std::placeholders::_3));
     conns.TransactionAddedToMempool =
-        g_signals.m_internals->TransactionAddedToMempool.connect(boost::bind(
-            &CValidationInterface::TransactionAddedToMempool, pwalletIn, _1));
-    conns.BlockConnected =
-        g_signals.m_internals->BlockConnected.connect(boost::bind(
-            &CValidationInterface::BlockConnected, pwalletIn, _1, _2, _3));
+        g_signals.m_internals->TransactionAddedToMempool.connect(
+            std::bind(&CValidationInterface::TransactionAddedToMempool,
+                      pwalletIn, std::placeholders::_1));
+    conns.BlockConnected = g_signals.m_internals->BlockConnected.connect(
+        std::bind(&CValidationInterface::BlockConnected, pwalletIn,
+                  std::placeholders::_1, std::placeholders::_2,
+                  std::placeholders::_3));
     conns.BlockDisconnected = g_signals.m_internals->BlockDisconnected.connect(
-        boost::bind(&CValidationInterface::BlockDisconnected, pwalletIn, _1));
+        std::bind(&CValidationInterface::BlockDisconnected, pwalletIn,
+                  std::placeholders::_1));
     conns.TransactionRemovedFromMempool =
         g_signals.m_internals->TransactionRemovedFromMempool.connect(
-            boost::bind(&CValidationInterface::TransactionRemovedFromMempool,
-                        pwalletIn, _1));
+            std::bind(&CValidationInterface::TransactionRemovedFromMempool,
+                      pwalletIn, std::placeholders::_1));
     conns.ChainStateFlushed = g_signals.m_internals->ChainStateFlushed.connect(
-        boost::bind(&CValidationInterface::ChainStateFlushed, pwalletIn, _1));
-    conns.Broadcast = g_signals.m_internals->Broadcast.connect(boost::bind(
-        &CValidationInterface::ResendWalletTransactions, pwalletIn, _1, _2));
+        std::bind(&CValidationInterface::ChainStateFlushed, pwalletIn,
+                  std::placeholders::_1));
+    conns.Broadcast = g_signals.m_internals->Broadcast.connect(
+        std::bind(&CValidationInterface::ResendWalletTransactions, pwalletIn,
+                  std::placeholders::_1, std::placeholders::_2));
     conns.BlockChecked = g_signals.m_internals->BlockChecked.connect(
-        boost::bind(&CValidationInterface::BlockChecked, pwalletIn, _1, _2));
-    conns.NewPoWValidBlock =
-        g_signals.m_internals->NewPoWValidBlock.connect(boost::bind(
-            &CValidationInterface::NewPoWValidBlock, pwalletIn, _1, _2));
+        std::bind(&CValidationInterface::BlockChecked, pwalletIn,
+                  std::placeholders::_1, std::placeholders::_2));
+    conns.NewPoWValidBlock = g_signals.m_internals->NewPoWValidBlock.connect(
+        std::bind(&CValidationInterface::NewPoWValidBlock, pwalletIn,
+                  std::placeholders::_1, std::placeholders::_2));
 }
 
 void UnregisterValidationInterface(CValidationInterface *pwalletIn) {
     g_signals.m_internals->m_connMainSignals.erase(pwalletIn);
 }
 
 void UnregisterAllValidationInterfaces() {
     if (!g_signals.m_internals) {
         return;
     }
     g_signals.m_internals->m_connMainSignals.clear();
 }
 
 void CallFunctionInValidationInterfaceQueue(std::function<void()> func) {
     g_signals.m_internals->m_schedulerClient.AddToProcessQueue(std::move(func));
 }
 
 void SyncWithValidationInterfaceQueue() {
     AssertLockNotHeld(cs_main);
     // Block until the validation queue drains
     std::promise<void> promise;
     CallFunctionInValidationInterfaceQueue([&promise] { promise.set_value(); });
     promise.get_future().wait();
 }
 
 void CMainSignals::MempoolEntryRemoved(CTransactionRef ptx,
                                        MemPoolRemovalReason reason) {
     if (reason != MemPoolRemovalReason::BLOCK &&
         reason != MemPoolRemovalReason::CONFLICT) {
         m_internals->m_schedulerClient.AddToProcessQueue(
             [ptx, this] { m_internals->TransactionRemovedFromMempool(ptx); });
     }
 }
 
 void CMainSignals::UpdatedBlockTip(const CBlockIndex *pindexNew,
                                    const CBlockIndex *pindexFork,
                                    bool fInitialDownload) {
     // Dependencies exist that require UpdatedBlockTip events to be delivered in
     // the order in which the chain actually updates. One way to ensure this is
     // for the caller to invoke this signal in the same critical section where
     // the chain is updated
 
     m_internals->m_schedulerClient.AddToProcessQueue([pindexNew, pindexFork,
                                                       fInitialDownload, this] {
         m_internals->UpdatedBlockTip(pindexNew, pindexFork, fInitialDownload);
     });
 }
 
 void CMainSignals::TransactionAddedToMempool(const CTransactionRef &ptx) {
     m_internals->m_schedulerClient.AddToProcessQueue(
         [ptx, this] { m_internals->TransactionAddedToMempool(ptx); });
 }
 
 void CMainSignals::BlockConnected(
     const std::shared_ptr<const CBlock> &pblock, const CBlockIndex *pindex,
     const std::shared_ptr<const std::vector<CTransactionRef>> &pvtxConflicted) {
     m_internals->m_schedulerClient.AddToProcessQueue(
         [pblock, pindex, pvtxConflicted, this] {
             m_internals->BlockConnected(pblock, pindex, *pvtxConflicted);
         });
 }
 
 void CMainSignals::BlockDisconnected(
     const std::shared_ptr<const CBlock> &pblock) {
     m_internals->m_schedulerClient.AddToProcessQueue(
         [pblock, this] { m_internals->BlockDisconnected(pblock); });
 }
 
 void CMainSignals::ChainStateFlushed(const CBlockLocator &locator) {
     m_internals->m_schedulerClient.AddToProcessQueue(
         [locator, this] { m_internals->ChainStateFlushed(locator); });
 }
 
 void CMainSignals::Broadcast(int64_t nBestBlockTime, CConnman *connman) {
     m_internals->Broadcast(nBestBlockTime, connman);
 }
 
 void CMainSignals::BlockChecked(const CBlock &block,
                                 const CValidationState &state) {
     m_internals->BlockChecked(block, state);
 }
 
 void CMainSignals::NewPoWValidBlock(
     const CBlockIndex *pindex, const std::shared_ptr<const CBlock> &block) {
     m_internals->NewPoWValidBlock(pindex, block);
 }
diff --git a/test/lint/lint-boost-dependencies.sh b/test/lint/lint-boost-dependencies.sh
index f17a2f916..2bebea5cd 100755
--- a/test/lint/lint-boost-dependencies.sh
+++ b/test/lint/lint-boost-dependencies.sh
@@ -1,75 +1,74 @@
 #!/usr/bin/env bash
 #
 # Copyright (c) 2018 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 #
 # Guard against accidental introduction of new Boost dependencies.
 
 export LC_ALL=C
 
 EXPECTED_BOOST_INCLUDES=(
     boost/algorithm/string.hpp
     boost/algorithm/string/classification.hpp
     boost/algorithm/string/predicate.hpp
     boost/algorithm/string/replace.hpp
     boost/algorithm/string/split.hpp
     boost/assign/std/vector.hpp
-    boost/bind.hpp
     boost/chrono/chrono.hpp
     boost/date_time/posix_time/posix_time.hpp
     boost/filesystem.hpp
     boost/filesystem/fstream.hpp
     boost/interprocess/sync/file_lock.hpp
     boost/lexical_cast.hpp
     boost/multi_index/composite_key.hpp
     boost/multi_index/hashed_index.hpp
     boost/multi_index/member.hpp
     boost/multi_index/ordered_index.hpp
     boost/multi_index/sequenced_index.hpp
     boost/multi_index_container.hpp
     boost/noncopyable.hpp
     boost/optional.hpp
     boost/preprocessor/cat.hpp
     boost/preprocessor/stringize.hpp
     boost/range/iterator.hpp
     boost/range/adaptor/sliced.hpp
     boost/scoped_array.hpp
     boost/signals2/connection.hpp
     boost/signals2/last_value.hpp
     boost/signals2/signal.hpp
     boost/test/unit_test.hpp
     boost/thread.hpp
     boost/thread/condition_variable.hpp
     boost/thread/locks.hpp
     boost/thread/mutex.hpp
     boost/thread/shared_mutex.hpp
     boost/thread/thread.hpp
     boost/variant.hpp
     boost/variant/apply_visitor.hpp
     boost/variant/static_visitor.hpp
 )
 
 for BOOST_INCLUDE in $(git grep '^#include <boost/' -- "*.cpp" "*.h" | cut -f2 -d: | cut -f2 -d'<' | cut -f1 -d'>' | sort -u); do
     IS_EXPECTED_INCLUDE=0
     for EXPECTED_BOOST_INCLUDE in "${EXPECTED_BOOST_INCLUDES[@]}"; do
         if [[ "${BOOST_INCLUDE}" == "${EXPECTED_BOOST_INCLUDE}" ]]; then
             IS_EXPECTED_INCLUDE=1
             break
         fi
     done
     if [[ ${IS_EXPECTED_INCLUDE} == 0 ]]; then
         echo "A new Boost dependency in the form of \"${BOOST_INCLUDE}\" appears to have been introduced:"
         git grep "${BOOST_INCLUDE}" -- "*.cpp" "*.h"
         echo
     fi
 done
 
 for EXPECTED_BOOST_INCLUDE in "${EXPECTED_BOOST_INCLUDES[@]}"; do
     if ! git grep -q "^#include <${EXPECTED_BOOST_INCLUDE}>" -- "*.cpp" "*.h"; then
         echo "Good job! The Boost dependency \"${EXPECTED_BOOST_INCLUDE}\" is no longer used."
         echo "Please remove it from EXPECTED_BOOST_INCLUDES in $0"
         echo "to make sure this dependency is not accidentally reintroduced."
         echo
     fi
 done