diff --git a/src/dummywallet.cpp b/src/dummywallet.cpp
index e84dd0d34..448db00cc 100644
--- a/src/dummywallet.cpp
+++ b/src/dummywallet.cpp
@@ -1,88 +1,48 @@
 // 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.
 
 #include <logging.h>
-#include <support/allocators/secure.h>
 #include <util/system.h>
 #include <walletinitinterface.h>
 
 class CChainParams;
 class CWallet;
-enum class WalletCreationStatus;
-struct bilingual_str;
 
 namespace interfaces {
 class Chain;
 class Handler;
 class Wallet;
 } // namespace interfaces
 
 class DummyWalletInit : public WalletInitInterface {
 public:
     bool HasWalletSupport() const override { return false; }
     void AddWalletOptions(ArgsManager &argsman) const override;
     bool ParameterInteraction() const override { return true; }
     void Construct(NodeContext &node) const override {
         LogPrintf("No wallet support compiled in!\n");
     }
 };
 
 void DummyWalletInit::AddWalletOptions(ArgsManager &argsman) const {
     std::vector<std::string> opts = {
         "-avoidpartialspends", "-disablewallet", "-fallbackfee=<amt>",
         "-keypool=<n>", "-maxapsfee=<n>", "-maxtxfee=<amt>", "-mintxfee=<amt>",
         "-paytxfee=<amt>", "-rescan", "-salvagewallet", "-spendzeroconfchange",
         "-upgradewallet", "-wallet=<path>", "-walletbroadcast",
         "-walletdir=<dir>", "-walletnotify=<cmd>", "-zapwallettxes=<mode>",
         // Wallet debug options
         "-dblogsize=<n>", "-flushwallet", "-privdb", "-walletrejectlongchains"};
     argsman.AddHiddenArgs(opts);
 }
 
 const WalletInitInterface &g_wallet_init_interface = DummyWalletInit();
 
-fs::path GetWalletDir() {
-    throw std::logic_error("Wallet function called in non-wallet build.");
-}
-
-std::vector<fs::path> ListWalletDir() {
-    throw std::logic_error("Wallet function called in non-wallet build.");
-}
-
-std::vector<std::shared_ptr<CWallet>> GetWallets() {
-    throw std::logic_error("Wallet function called in non-wallet build.");
-}
-
-std::shared_ptr<CWallet> LoadWallet(const CChainParams &chainParams,
-                                    interfaces::Chain &chain,
-                                    const std::string &name,
-                                    bilingual_str &error,
-                                    std::vector<bilingual_str> &warnings) {
-    throw std::logic_error("Wallet function called in non-wallet build.");
-}
-
-WalletCreationStatus CreateWallet(const CChainParams &chainParams,
-                                  interfaces::Chain &chain,
-                                  const SecureString &passphrase,
-                                  uint64_t wallet_creation_flags,
-                                  const std::string &name, bilingual_str &error,
-                                  std::vector<bilingual_str> &warnings,
-                                  std::shared_ptr<CWallet> &result) {
-    throw std::logic_error("Wallet function called in non-wallet build.");
-}
-
-using LoadWalletFn =
-    std::function<void(std::unique_ptr<interfaces::Wallet> wallet)>;
-std::unique_ptr<interfaces::Handler>
-HandleLoadWallet(LoadWalletFn load_wallet) {
-    throw std::logic_error("Wallet function called in non-wallet build.");
-}
-
 namespace interfaces {
 
 std::unique_ptr<Wallet> MakeWallet(const std::shared_ptr<CWallet> &wallet) {
     throw std::logic_error("Wallet function called in non-wallet build.");
 }
 
 } // namespace interfaces
diff --git a/src/interfaces/chain.h b/src/interfaces/chain.h
index 58ea78543..ceb2e9b9c 100644
--- a/src/interfaces/chain.h
+++ b/src/interfaces/chain.h
@@ -1,370 +1,355 @@
 // Copyright (c) 2018-2019 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #ifndef BITCOIN_INTERFACES_CHAIN_H
 #define BITCOIN_INTERFACES_CHAIN_H
 
 #include <primitives/transaction.h>
 #include <primitives/txid.h>
 
 #include <cstddef>
 #include <cstdint>
 #include <functional>
 #include <memory>
 #include <optional>
 #include <string>
 #include <vector>
 
 class ArgsManager;
 class CBlock;
 class CChainParams;
 class Coin;
 class Config;
 class CRPCCommand;
 class CScheduler;
 class TxValidationState;
 
 enum class MemPoolRemovalReason;
 
 struct BlockHash;
 struct bilingual_str;
 struct CBlockLocator;
 struct NodeContext;
 
 namespace Consensus {
 struct Params;
 }
 
 namespace interfaces {
 
 class Handler;
 class Wallet;
 
 //! Helper for findBlock to selectively return pieces of block data.
 class FoundBlock {
 public:
     FoundBlock &hash(BlockHash &hash) {
         m_hash = &hash;
         return *this;
     }
     FoundBlock &height(int &height) {
         m_height = &height;
         return *this;
     }
     FoundBlock &time(int64_t &time) {
         m_time = &time;
         return *this;
     }
     FoundBlock &maxTime(int64_t &max_time) {
         m_max_time = &max_time;
         return *this;
     }
     FoundBlock &mtpTime(int64_t &mtp_time) {
         m_mtp_time = &mtp_time;
         return *this;
     }
     //! Read block data from disk. If the block exists but doesn't have data
     //! (for example due to pruning), the CBlock variable will be set to null.
     FoundBlock &data(CBlock &data) {
         m_data = &data;
         return *this;
     }
 
     BlockHash *m_hash = nullptr;
     int *m_height = nullptr;
     int64_t *m_time = nullptr;
     int64_t *m_max_time = nullptr;
     int64_t *m_mtp_time = nullptr;
     CBlock *m_data = nullptr;
 };
 
 //! Interface giving clients (wallet processes, maybe other analysis tools in
 //! the future) ability to access to the chain state, receive notifications,
 //! estimate fees, and submit transactions.
 //!
 //! TODO: Current chain methods are too low level, exposing too much of the
 //! internal workings of the bitcoin node, and not being very convenient to use.
 //! Chain methods should be cleaned up and simplified over time. Examples:
 //!
 //! * The initMessages() and showProgress() methods which the wallet uses to
 //! send
 //!   notifications to the GUI should go away when GUI and wallet can directly
 //!   communicate with each other without going through the node
 //!   (https://github.com/bitcoin/bitcoin/pull/15288#discussion_r253321096).
 //!
 //! * The handleRpc, registerRpcs, rpcEnableDeprecated methods and other RPC
 //!   methods can go away if wallets listen for HTTP requests on their own
 //!   ports instead of registering to handle requests on the node HTTP port.
 //!
 //! * Move fee estimation queries to an asynchronous interface and let the
 //!   wallet cache it, fee estimation being driven by node mempool, wallet
 //!   should be the consumer.
 //!
 //! * The `guessVerificationProgress`, `getBlockHeight`, `getBlockHash`, etc
 //!   methods can go away if rescan logic is moved on the node side, and wallet
 //!   only register rescan request.
 class Chain {
 public:
     virtual ~Chain() {}
 
     //! Get current chain height, not including genesis block (returns 0 if
     //! chain only contains genesis block, std::nullopt if chain does not
     //! contain any blocks)
     virtual std::optional<int> getHeight() = 0;
 
     //! Get block height above genesis block. Returns 0 for genesis block,
     //! 1 for following block, and so on. Returns std::nullopt for a block not
     //! included in the current chain.
     virtual std::optional<int> getBlockHeight(const BlockHash &hash) = 0;
 
     //! Get block hash. Height must be valid or this function will abort.
     virtual BlockHash getBlockHash(int height) = 0;
 
     //! Check that the block is available on disk (i.e. has not been
     //! pruned), and contains transactions.
     virtual bool haveBlockOnDisk(int height) = 0;
 
     //! Return height of the first block in the chain with timestamp equal
     //! or greater than the given time and height equal or greater than the
     //! given height, or std::nullopt if there is no block with a high enough
     //! timestamp and height. Also return the block hash as an optional output
     //! parameter (to avoid the cost of a second lookup in case this information
     //! is needed.)
     virtual std::optional<int>
     findFirstBlockWithTimeAndHeight(int64_t time, int height,
                                     BlockHash *hash) = 0;
 
     //! Get locator for the current chain tip.
     virtual CBlockLocator getTipLocator() = 0;
 
     //! Return height of the highest block on chain in common with the locator,
     //! which will either be the original block used to create the locator,
     //! or one of its ancestors.
     virtual std::optional<int>
     findLocatorFork(const CBlockLocator &locator) = 0;
 
     //! Check if transaction will be final given chain height current time.
     virtual bool
     contextualCheckTransactionForCurrentBlock(const CTransaction &tx,
                                               TxValidationState &state) = 0;
 
     //! Return whether node has the block and optionally return block metadata
     //! or contents.
     virtual bool findBlock(const BlockHash &hash,
                            const FoundBlock &block = {}) = 0;
 
     //! Find first block in the chain with timestamp >= the given time
     //! and height >= than the given height, return false if there is no block
     //! with a high enough timestamp and height. Optionally return block
     //! information.
     virtual bool
     findFirstBlockWithTimeAndHeight(int64_t min_time, int min_height,
                                     const FoundBlock &block = {}) = 0;
 
     //! Find next block if block is part of current chain. Also flag if
     //! there was a reorg and the specified block hash is no longer in the
     //! current chain, and optionally return block information.
     virtual bool findNextBlock(const BlockHash &block_hash, int block_height,
                                const FoundBlock &next = {},
                                bool *reorg = nullptr) = 0;
 
     //! Find ancestor of block at specified height and optionally return
     //! ancestor information.
     virtual bool findAncestorByHeight(const BlockHash &block_hash,
                                       int ancestor_height,
                                       const FoundBlock &ancestor_out = {}) = 0;
 
     //! Return whether block descends from a specified ancestor, and
     //! optionally return ancestor information.
     virtual bool findAncestorByHash(const BlockHash &block_hash,
                                     const BlockHash &ancestor_hash,
                                     const FoundBlock &ancestor_out = {}) = 0;
 
     //! Find most recent common ancestor between two blocks and optionally
     //! return block information.
     virtual bool findCommonAncestor(const BlockHash &block_hash1,
                                     const BlockHash &block_hash2,
                                     const FoundBlock &ancestor_out = {},
                                     const FoundBlock &block1_out = {},
                                     const FoundBlock &block2_out = {}) = 0;
 
     //! Look up unspent output information. Returns coins in the mempool and in
     //! the current chain UTXO set. Iterates through all the keys in the map and
     //! populates the values.
     virtual void findCoins(std::map<COutPoint, Coin> &coins) = 0;
 
     //! Estimate fraction of total transactions verified if blocks up to
     //! the specified block hash are verified.
     virtual double guessVerificationProgress(const BlockHash &block_hash) = 0;
 
     //! Return true if data is available for all blocks in the specified range
     //! of blocks. This checks all blocks that are ancestors of block_hash in
     //! the height range from min_height to max_height, inclusive.
     virtual bool hasBlocks(const BlockHash &block_hash, int min_height = 0,
                            std::optional<int> max_height = {}) = 0;
 
     //! Check if transaction has descendants in mempool.
     virtual bool hasDescendantsInMempool(const TxId &txid) = 0;
 
     //! Transaction is added to memory pool, if the transaction fee is below the
     //! amount specified by max_tx_fee, and broadcast to all peers if relay is
     //! set to true. Return false if the transaction could not be added due to
     //! the fee or for another reason.
     virtual bool broadcastTransaction(const Config &config,
                                       const CTransactionRef &tx,
                                       const Amount &max_tx_fee, bool relay,
                                       std::string &err_string) = 0;
 
     //! Calculate mempool ancestor and descendant counts for the given
     //! transaction.
     virtual void getTransactionAncestry(const TxId &txid, size_t &ancestors,
                                         size_t &descendants) = 0;
 
     //! Get the node's package limits.
     //! Currently only returns the ancestor and descendant count limits, but
     //! could be enhanced to return more policy settings.
     virtual void getPackageLimits(size_t &limit_ancestor_count,
                                   size_t &limit_descendant_count) = 0;
 
     //! Check if transaction will pass the mempool's chain limits.
     virtual bool checkChainLimits(const CTransactionRef &tx) = 0;
 
     //! Estimate fee
     virtual CFeeRate estimateFee() const = 0;
 
     //! Relay current minimum fee (from -minrelaytxfee settings).
     virtual CFeeRate relayMinFee() = 0;
 
     //! Relay dust fee setting (-dustrelayfee), reflecting lowest rate it's
     //! economical to spend.
     virtual CFeeRate relayDustFee() = 0;
 
     //! Check if any block has been pruned.
     virtual bool havePruned() = 0;
 
     //! Check if the node is ready to broadcast transactions.
     virtual bool isReadyToBroadcast() = 0;
 
     //! Check if in IBD.
     virtual bool isInitialBlockDownload() = 0;
 
     //! Check if shutdown requested.
     virtual bool shutdownRequested() = 0;
 
     //! Get adjusted time.
     virtual int64_t getAdjustedTime() = 0;
 
     //! Send init message.
     virtual void initMessage(const std::string &message) = 0;
 
     //! Send init warning.
     virtual void initWarning(const bilingual_str &message) = 0;
 
     //! Send init error.
     virtual void initError(const bilingual_str &message) = 0;
 
     //! Send progress indicator.
     virtual void showProgress(const std::string &title, int progress,
                               bool resume_possible) = 0;
 
     //! Chain notifications.
     class Notifications {
     public:
         virtual ~Notifications() {}
         virtual void transactionAddedToMempool(const CTransactionRef &tx) {}
         virtual void
         transactionRemovedFromMempool(const CTransactionRef &ptx,
                                       MemPoolRemovalReason reason) {}
         virtual void blockConnected(const CBlock &block, int height) {}
         virtual void blockDisconnected(const CBlock &block, int height) {}
         virtual void updatedBlockTip() {}
         virtual void chainStateFlushed(const CBlockLocator &locator) {}
     };
 
     //! Register handler for notifications.
     virtual std::unique_ptr<Handler>
     handleNotifications(std::shared_ptr<Notifications> notifications) = 0;
 
     //! Wait for pending notifications to be processed unless block hash points
     //! to the current chain tip.
     virtual void waitForNotificationsIfTipChanged(const BlockHash &old_tip) = 0;
 
     //! Register handler for RPC. Command is not copied, so reference
     //! needs to remain valid until Handler is disconnected.
     virtual std::unique_ptr<Handler> handleRpc(const CRPCCommand &command) = 0;
 
     //! Check if deprecated RPC is enabled.
     virtual bool rpcEnableDeprecated(const std::string &method) = 0;
 
     //! Run function after given number of seconds. Cancel any previous calls
     //! with same name.
     virtual void rpcRunLater(const std::string &name, std::function<void()> fn,
                              int64_t seconds) = 0;
 
     //! Current RPC serialization flags.
     virtual int rpcSerializationFlags() = 0;
 
     //! Synchronously send transactionAddedToMempool notifications about all
     //! current mempool transactions to the specified handler and return after
     //! the last one is sent. These notifications aren't coordinated with async
     //! notifications sent by handleNotifications, so out of date async
     //! notifications from handleNotifications can arrive during and after
     //! synchronous notifications from requestMempoolTransactions. Clients need
     //! to be prepared to handle this by ignoring notifications about unknown
     //! removed transactions and already added new transactions.
     virtual void requestMempoolTransactions(Notifications &notifications) = 0;
 
     //! This Chain's parameters
     virtual const CChainParams &params() const = 0;
 };
 
 //! Interface to let node manage chain clients (wallets, or maybe tools for
 //! monitoring and analysis in the future).
 class ChainClient {
 public:
     virtual ~ChainClient() {}
 
     //! Register rpcs.
     virtual void registerRpcs() = 0;
 
     //! Check for errors before loading.
     virtual bool verify(const CChainParams &chainParams) = 0;
 
     //! Load saved state.
     virtual bool load(const CChainParams &chainParams) = 0;
 
     //! Start client execution and provide a scheduler.
     virtual void start(CScheduler &scheduler) = 0;
 
     //! Save state to disk.
     virtual void flush() = 0;
 
     //! Shut down client.
     virtual void stop() = 0;
 
     //! Set mock time.
     virtual void setMockTime(int64_t time) = 0;
-
-    //! Return interfaces for accessing wallets (if any).
-    virtual std::vector<std::unique_ptr<Wallet>> getWallets() = 0;
 };
 
 //! Return implementation of Chain interface.
 std::unique_ptr<Chain> MakeChain(NodeContext &node, const CChainParams &params);
 
-//! Return implementation of ChainClient interface for a wallet client. This
-//! function will be undefined in builds where ENABLE_WALLET is false.
-//!
-//! Currently, wallets are the only chain clients. But in the future, other
-//! types of chain clients could be added, such as tools for monitoring,
-//! analysis, or fee estimation. These clients need to expose their own
-//! MakeXXXClient functions returning their implementations of the ChainClient
-//! interface.
-std::unique_ptr<ChainClient>
-MakeWalletClient(Chain &chain, ArgsManager &args,
-                 std::vector<std::string> wallet_filenames);
-
 } // namespace interfaces
 
 #endif // BITCOIN_INTERFACES_CHAIN_H
diff --git a/src/interfaces/node.cpp b/src/interfaces/node.cpp
index 7b20c519b..d3c37a125 100644
--- a/src/interfaces/node.cpp
+++ b/src/interfaces/node.cpp
@@ -1,376 +1,322 @@
 // 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.
 
 #include <interfaces/node.h>
 
 #include <addrdb.h>
 #include <banman.h>
 #include <chain.h>
 #include <chainparams.h>
 #include <config.h>
 #include <init.h>
 #include <interfaces/chain.h>
 #include <interfaces/handler.h>
 #include <interfaces/wallet.h>
 #include <net.h>
 #include <net_processing.h>
 #include <netaddress.h>
 #include <netbase.h>
 #include <node/context.h>
 #include <node/ui_interface.h>
 #include <policy/fees.h>
 #include <policy/settings.h>
 #include <primitives/block.h>
 #include <rpc/server.h>
 #include <shutdown.h>
 #include <support/allocators/secure.h>
 #include <sync.h>
 #include <txmempool.h>
+#include <util/check.h>
 #include <util/ref.h>
 #include <util/system.h>
 #include <util/translation.h>
 #include <validation.h>
 #include <warnings.h>
 
 #if defined(HAVE_CONFIG_H)
 #include <config/bitcoin-config.h>
 #endif
 
 #include <univalue.h>
 
 #include <boost/signals2/signal.hpp>
 
 class HTTPRPCRequestProcessor;
-class CWallet;
-fs::path GetWalletDir();
-std::vector<fs::path> ListWalletDir();
-std::vector<std::shared_ptr<CWallet>> GetWallets();
-std::shared_ptr<CWallet> LoadWallet(const CChainParams &chainParams,
-                                    interfaces::Chain &chain,
-                                    const std::string &name,
-                                    bilingual_str &error,
-                                    std::vector<bilingual_str> &warnings);
-WalletCreationStatus CreateWallet(const CChainParams &params,
-                                  interfaces::Chain &chain,
-                                  const SecureString &passphrase,
-                                  uint64_t wallet_creation_flags,
-                                  const std::string &name, bilingual_str &error,
-                                  std::vector<bilingual_str> &warnings,
-                                  std::shared_ptr<CWallet> &result);
-std::unique_ptr<interfaces::Handler>
-HandleLoadWallet(interfaces::Node::LoadWalletFn load_wallet);
-
 namespace interfaces {
-
 namespace {
 
     class NodeImpl : public Node {
     public:
         NodeImpl(NodeContext *context) { setContext(context); }
         void initLogging() override { InitLogging(*Assert(m_context->args)); }
         void initParameterInteraction() override {
             InitParameterInteraction(*Assert(m_context->args));
         }
         bilingual_str getWarnings() override { return GetWarnings(true); }
         bool baseInitialize(Config &config) override {
             return AppInitBasicSetup(gArgs) &&
                    AppInitParameterInteraction(config, gArgs) &&
                    AppInitSanityChecks() && AppInitLockDataDirectory() &&
                    AppInitInterfaces(*m_context);
         }
         bool appInitMain(Config &config, RPCServer &rpcServer,
                          HTTPRPCRequestProcessor &httpRPCRequestProcessor,
                          interfaces::BlockAndHeaderTipInfo *tip_info) override {
             return AppInitMain(config, rpcServer, httpRPCRequestProcessor,
                                *m_context, tip_info);
         }
         void appShutdown() override {
             Interrupt(*m_context);
             Shutdown(*m_context);
         }
         void startShutdown() override {
             StartShutdown();
             // Stop RPC for clean shutdown if any of waitfor* commands is
             // executed.
             if (gArgs.GetBoolArg("-server", false)) {
                 InterruptRPC();
                 StopRPC();
             }
         }
         bool shutdownRequested() override { return ShutdownRequested(); }
         void mapPort(bool use_upnp) override {
             if (use_upnp) {
                 StartMapPort();
             } else {
                 InterruptMapPort();
                 StopMapPort();
             }
         }
         bool getProxy(Network net, proxyType &proxy_info) override {
             return GetProxy(net, proxy_info);
         }
         size_t getNodeCount(CConnman::NumConnections flags) override {
             return m_context->connman ? m_context->connman->GetNodeCount(flags)
                                       : 0;
         }
         bool getNodesStats(NodesStats &stats) override {
             stats.clear();
 
             if (m_context->connman) {
                 std::vector<CNodeStats> stats_temp;
                 m_context->connman->GetNodeStats(stats_temp);
 
                 stats.reserve(stats_temp.size());
                 for (auto &node_stats_temp : stats_temp) {
                     stats.emplace_back(std::move(node_stats_temp), false,
                                        CNodeStateStats());
                 }
 
                 // Try to retrieve the CNodeStateStats for each node.
                 TRY_LOCK(::cs_main, lockMain);
                 if (lockMain) {
                     for (auto &node_stats : stats) {
                         std::get<1>(node_stats) =
                             GetNodeStateStats(std::get<0>(node_stats).nodeid,
                                               std::get<2>(node_stats));
                     }
                 }
                 return true;
             }
             return false;
         }
         bool getBanned(banmap_t &banmap) override {
             if (m_context->banman) {
                 m_context->banman->GetBanned(banmap);
                 return true;
             }
             return false;
         }
         bool ban(const CNetAddr &net_addr, int64_t ban_time_offset) override {
             if (m_context->banman) {
                 m_context->banman->Ban(net_addr, ban_time_offset);
                 return true;
             }
             return false;
         }
         bool unban(const CSubNet &ip) override {
             if (m_context->banman) {
                 m_context->banman->Unban(ip);
                 return true;
             }
             return false;
         }
         bool disconnectByAddress(const CNetAddr &net_addr) override {
             if (m_context->connman) {
                 return m_context->connman->DisconnectNode(net_addr);
             }
             return false;
         }
         bool disconnectById(NodeId id) override {
             if (m_context->connman) {
                 return m_context->connman->DisconnectNode(id);
             }
             return false;
         }
         int64_t getTotalBytesRecv() override {
             return m_context->connman ? m_context->connman->GetTotalBytesRecv()
                                       : 0;
         }
         int64_t getTotalBytesSent() override {
             return m_context->connman ? m_context->connman->GetTotalBytesSent()
                                       : 0;
         }
         size_t getMempoolSize() override {
             return m_context->mempool ? m_context->mempool->size() : 0;
         }
         size_t getMempoolDynamicUsage() override {
             return m_context->mempool ? m_context->mempool->DynamicMemoryUsage()
                                       : 0;
         }
         bool getHeaderTip(int &height, int64_t &block_time) override {
             LOCK(::cs_main);
             if (::pindexBestHeader) {
                 height = ::pindexBestHeader->nHeight;
                 block_time = ::pindexBestHeader->GetBlockTime();
                 return true;
             }
             return false;
         }
         int getNumBlocks() override {
             LOCK(::cs_main);
             return ::ChainActive().Height();
         }
         BlockHash getBestBlockHash() override {
             const CBlockIndex *tip =
                 WITH_LOCK(::cs_main, return ::ChainActive().Tip());
             return tip ? tip->GetBlockHash()
                        : Params().GenesisBlock().GetHash();
         }
         int64_t getLastBlockTime() override {
             LOCK(::cs_main);
             if (::ChainActive().Tip()) {
                 return ::ChainActive().Tip()->GetBlockTime();
             }
             // Genesis block's time of current network
             return Params().GenesisBlock().GetBlockTime();
         }
         double getVerificationProgress() override {
             const CBlockIndex *tip;
             {
                 LOCK(::cs_main);
                 tip = ::ChainActive().Tip();
             }
             return GuessVerificationProgress(Params().TxData(), tip);
         }
         bool isInitialBlockDownload() override {
             return ::ChainstateActive().IsInitialBlockDownload();
         }
         bool getReindex() override { return ::fReindex; }
         bool getImporting() override { return ::fImporting; }
         void setNetworkActive(bool active) override {
             if (m_context->connman) {
                 m_context->connman->SetNetworkActive(active);
             }
         }
         bool getNetworkActive() override {
             return m_context->connman && m_context->connman->GetNetworkActive();
         }
         CFeeRate estimateSmartFee() override {
             return m_context->mempool ? m_context->mempool->estimateFee()
                                       : CFeeRate();
         }
         CFeeRate getDustRelayFee() override { return ::dustRelayFee; }
         UniValue executeRpc(Config &config, const std::string &command,
                             const UniValue &params,
                             const std::string &uri) override {
             JSONRPCRequest req(m_context_ref);
             req.params = params;
             req.strMethod = command;
             req.URI = uri;
             return ::tableRPC.execute(config, req);
         }
         std::vector<std::string> listRpcCommands() override {
             return ::tableRPC.listCommands();
         }
         void rpcSetTimerInterfaceIfUnset(RPCTimerInterface *iface) override {
             RPCSetTimerInterfaceIfUnset(iface);
         }
         void rpcUnsetTimerInterface(RPCTimerInterface *iface) override {
             RPCUnsetTimerInterface(iface);
         }
         bool getUnspentOutput(const COutPoint &output, Coin &coin) override {
             LOCK(::cs_main);
             return ::ChainstateActive().CoinsTip().GetCoin(output, coin);
         }
-        std::string getWalletDir() override { return GetWalletDir().string(); }
-        std::vector<std::string> listWalletDir() override {
-            std::vector<std::string> paths;
-            for (auto &path : ListWalletDir()) {
-                paths.push_back(path.string());
-            }
-            return paths;
-        }
-        std::vector<std::unique_ptr<Wallet>> getWallets() override {
-            std::vector<std::unique_ptr<Wallet>> wallets;
-            for (auto &client : m_context->chain_clients) {
-                auto client_wallets = client->getWallets();
-                std::move(client_wallets.begin(), client_wallets.end(),
-                          std::back_inserter(wallets));
-            }
-            return wallets;
-        }
-        std::unique_ptr<Wallet>
-        loadWallet(const CChainParams &params, const std::string &name,
-                   bilingual_str &error,
-                   std::vector<bilingual_str> &warnings) const override {
-            return MakeWallet(
-                LoadWallet(params, *m_context->chain, name, error, warnings));
-        }
-        std::unique_ptr<Wallet>
-        createWallet(const CChainParams &params, const SecureString &passphrase,
-                     uint64_t wallet_creation_flags, const std::string &name,
-                     bilingual_str &error, std::vector<bilingual_str> &warnings,
-                     WalletCreationStatus &status) override {
-            std::shared_ptr<CWallet> wallet;
-            status = CreateWallet(params, *m_context->chain, passphrase,
-                                  wallet_creation_flags, name, error, warnings,
-                                  wallet);
-            return MakeWallet(wallet);
+        WalletClient &walletClient() override {
+            return *Assert(m_context->wallet_client);
         }
         std::unique_ptr<Handler> handleInitMessage(InitMessageFn fn) override {
             return MakeHandler(::uiInterface.InitMessage_connect(fn));
         }
         std::unique_ptr<Handler> handleMessageBox(MessageBoxFn fn) override {
             return MakeHandler(::uiInterface.ThreadSafeMessageBox_connect(fn));
         }
         std::unique_ptr<Handler> handleQuestion(QuestionFn fn) override {
             return MakeHandler(::uiInterface.ThreadSafeQuestion_connect(fn));
         }
         std::unique_ptr<Handler>
         handleShowProgress(ShowProgressFn fn) override {
             return MakeHandler(::uiInterface.ShowProgress_connect(fn));
         }
-        std::unique_ptr<Handler> handleLoadWallet(LoadWalletFn fn) override {
-            return HandleLoadWallet(std::move(fn));
-        }
         std::unique_ptr<Handler> handleNotifyNumConnectionsChanged(
             NotifyNumConnectionsChangedFn fn) override {
             return MakeHandler(
                 ::uiInterface.NotifyNumConnectionsChanged_connect(fn));
         }
         std::unique_ptr<Handler> handleNotifyNetworkActiveChanged(
             NotifyNetworkActiveChangedFn fn) override {
             return MakeHandler(
                 ::uiInterface.NotifyNetworkActiveChanged_connect(fn));
         }
         std::unique_ptr<Handler>
         handleNotifyAlertChanged(NotifyAlertChangedFn fn) override {
             return MakeHandler(::uiInterface.NotifyAlertChanged_connect(fn));
         }
         std::unique_ptr<Handler>
         handleBannedListChanged(BannedListChangedFn fn) override {
             return MakeHandler(::uiInterface.BannedListChanged_connect(fn));
         }
         std::unique_ptr<Handler>
         handleNotifyBlockTip(NotifyBlockTipFn fn) override {
             return MakeHandler(::uiInterface.NotifyBlockTip_connect(
                 [fn](SynchronizationState sync_state,
                      const CBlockIndex *block) {
                     fn(sync_state,
                        BlockTip{block->nHeight, block->GetBlockTime(),
                                 block->GetBlockHash()},
                        GuessVerificationProgress(Params().TxData(), block));
                 }));
         }
         std::unique_ptr<Handler>
         handleNotifyHeaderTip(NotifyHeaderTipFn fn) override {
             /* verification progress is unused when a header was received */
             return MakeHandler(::uiInterface.NotifyHeaderTip_connect(
                 [fn](SynchronizationState sync_state,
                      const CBlockIndex *block) {
                     fn(sync_state,
                        BlockTip{block->nHeight, block->GetBlockTime(),
                                 block->GetBlockHash()},
                        0);
                 }));
         }
         NodeContext *context() override { return m_context; }
         void setContext(NodeContext *context) override {
             m_context = context;
             if (context) {
                 m_context_ref.Set(*context);
             } else {
                 m_context_ref.Clear();
             }
         }
         NodeContext *m_context{nullptr};
         util::Ref m_context_ref{m_context};
     };
 } // namespace
 
 std::unique_ptr<Node> MakeNode(NodeContext *context) {
     return std::make_unique<NodeImpl>(context);
 }
 
 } // namespace interfaces
diff --git a/src/interfaces/node.h b/src/interfaces/node.h
index 66cfb308a..46a961a4f 100644
--- a/src/interfaces/node.h
+++ b/src/interfaces/node.h
@@ -1,285 +1,259 @@
 // 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.
 
 #ifndef BITCOIN_INTERFACES_NODE_H
 #define BITCOIN_INTERFACES_NODE_H
 
 #include <amount.h>     // For Amount
 #include <net.h>        // For CConnman::NumConnections
 #include <net_types.h>  // For banmap_t
 #include <netaddress.h> // For Network
 
 #include <support/allocators/secure.h> // For SecureString
 #include <util/translation.h>
 
 #include <cstddef>
 #include <cstdint>
 #include <functional>
 #include <memory>
 #include <string>
 #include <tuple>
 #include <vector>
 
 class BanMan;
 class CCoinControl;
 class CFeeRate;
 struct CNodeStateStats;
 struct CNodeStats;
 class Coin;
 class Config;
 class HTTPRPCRequestProcessor;
 struct NodeContext;
 class proxyType;
 class RPCServer;
 class RPCTimerInterface;
 enum class SynchronizationState;
 class UniValue;
-enum class WalletCreationStatus;
 struct bilingual_str;
 
 namespace interfaces {
 class Handler;
-class Wallet;
+class WalletClient;
 struct BlockTip;
 
 //! Block and header tip information
 struct BlockAndHeaderTipInfo {
     int block_height;
     int64_t block_time;
     int header_height;
     int64_t header_time;
     double verification_progress;
 };
 
 //! Top-level interface for a bitcoin node (bitcoind process).
 class Node {
 public:
     virtual ~Node() {}
 
     //! Init logging.
     virtual void initLogging() = 0;
 
     //! Init parameter interaction.
     virtual void initParameterInteraction() = 0;
 
     //! Get warnings.
     virtual bilingual_str getWarnings() = 0;
 
     //! Initialize app dependencies.
     virtual bool baseInitialize(Config &config) = 0;
 
     //! Start node.
     virtual bool
     appInitMain(Config &config, RPCServer &rpcServer,
                 HTTPRPCRequestProcessor &httpRPCRequestProcessor,
                 interfaces::BlockAndHeaderTipInfo *tip_info = nullptr) = 0;
 
     //! Stop node.
     virtual void appShutdown() = 0;
 
     //! Start shutdown.
     virtual void startShutdown() = 0;
 
     //! Return whether shutdown was requested.
     virtual bool shutdownRequested() = 0;
 
     //! Map port.
     virtual void mapPort(bool use_upnp) = 0;
 
     //! Get proxy.
     virtual bool getProxy(Network net, proxyType &proxy_info) = 0;
 
     //! Get number of connections.
     virtual size_t getNodeCount(CConnman::NumConnections flags) = 0;
 
     //! Get stats for connected nodes.
     using NodesStats =
         std::vector<std::tuple<CNodeStats, bool, CNodeStateStats>>;
     virtual bool getNodesStats(NodesStats &stats) = 0;
 
     //! Get ban map entries.
     virtual bool getBanned(banmap_t &banmap) = 0;
 
     //! Ban node.
     virtual bool ban(const CNetAddr &net_addr, int64_t ban_time_offset) = 0;
 
     //! Unban node.
     virtual bool unban(const CSubNet &ip) = 0;
 
     //! Disconnect node by address.
     virtual bool disconnectByAddress(const CNetAddr &net_addr) = 0;
 
     //! Disconnect node by id.
     virtual bool disconnectById(NodeId id) = 0;
 
     //! Get total bytes recv.
     virtual int64_t getTotalBytesRecv() = 0;
 
     //! Get total bytes sent.
     virtual int64_t getTotalBytesSent() = 0;
 
     //! Get mempool size.
     virtual size_t getMempoolSize() = 0;
 
     //! Get mempool dynamic usage.
     virtual size_t getMempoolDynamicUsage() = 0;
 
     //! Get header tip height and time.
     virtual bool getHeaderTip(int &height, int64_t &block_time) = 0;
 
     //! Get num blocks.
     virtual int getNumBlocks() = 0;
 
     //! Get best block hash.
     virtual BlockHash getBestBlockHash() = 0;
 
     //! Get last block time.
     virtual int64_t getLastBlockTime() = 0;
 
     //! Get verification progress.
     virtual double getVerificationProgress() = 0;
 
     //! Is initial block download.
     virtual bool isInitialBlockDownload() = 0;
 
     //! Get reindex.
     virtual bool getReindex() = 0;
 
     //! Get importing.
     virtual bool getImporting() = 0;
 
     //! Set network active.
     virtual void setNetworkActive(bool active) = 0;
 
     //! Get network active.
     virtual bool getNetworkActive() = 0;
 
     //! Estimate smart fee.
     virtual CFeeRate estimateSmartFee() = 0;
 
     //! Get dust relay fee.
     virtual CFeeRate getDustRelayFee() = 0;
 
     //! Execute rpc command.
     virtual UniValue executeRpc(Config &config, const std::string &command,
                                 const UniValue &params,
                                 const std::string &uri) = 0;
 
     //! List rpc commands.
     virtual std::vector<std::string> listRpcCommands() = 0;
 
     //! Set RPC timer interface if unset.
     virtual void rpcSetTimerInterfaceIfUnset(RPCTimerInterface *iface) = 0;
 
     //! Unset RPC timer interface.
     virtual void rpcUnsetTimerInterface(RPCTimerInterface *iface) = 0;
 
     //! Get unspent outputs associated with a transaction.
     virtual bool getUnspentOutput(const COutPoint &output, Coin &coin) = 0;
 
-    //! Return default wallet directory.
-    virtual std::string getWalletDir() = 0;
-
-    //! Return available wallets in wallet directory.
-    virtual std::vector<std::string> listWalletDir() = 0;
-
-    //! Return interfaces for accessing wallets (if any).
-    virtual std::vector<std::unique_ptr<Wallet>> getWallets() = 0;
-
-    //! Attempts to load a wallet from file or directory.
-    //! The loaded wallet is also notified to handlers previously registered
-    //! with handleLoadWallet.
-    virtual std::unique_ptr<Wallet>
-    loadWallet(const CChainParams &params, const std::string &name,
-               bilingual_str &error,
-               std::vector<bilingual_str> &warnings) const = 0;
-
-    //! Create a wallet from file
-    virtual std::unique_ptr<Wallet>
-    createWallet(const CChainParams &params, const SecureString &passphrase,
-                 uint64_t wallet_creation_flags, const std::string &name,
-                 bilingual_str &error, std::vector<bilingual_str> &warnings,
-                 WalletCreationStatus &status) = 0;
+    //! Get wallet client.
+    virtual WalletClient &walletClient() = 0;
 
     //! Register handler for init messages.
     using InitMessageFn = std::function<void(const std::string &message)>;
     virtual std::unique_ptr<Handler> handleInitMessage(InitMessageFn fn) = 0;
 
     //! Register handler for message box messages.
     using MessageBoxFn =
         std::function<bool(const bilingual_str &message,
                            const std::string &caption, unsigned int style)>;
     virtual std::unique_ptr<Handler> handleMessageBox(MessageBoxFn fn) = 0;
 
     //! Register handler for question messages.
     using QuestionFn =
         std::function<bool(const bilingual_str &message,
                            const std::string &non_interactive_message,
                            const std::string &caption, unsigned int style)>;
     virtual std::unique_ptr<Handler> handleQuestion(QuestionFn fn) = 0;
 
     //! Register handler for progress messages.
     using ShowProgressFn = std::function<void(
         const std::string &title, int progress, bool resume_possible)>;
     virtual std::unique_ptr<Handler> handleShowProgress(ShowProgressFn fn) = 0;
 
-    //! Register handler for load wallet messages.
-    using LoadWalletFn = std::function<void(std::unique_ptr<Wallet> wallet)>;
-    virtual std::unique_ptr<Handler> handleLoadWallet(LoadWalletFn fn) = 0;
-
     //! Register handler for number of connections changed messages.
     using NotifyNumConnectionsChangedFn =
         std::function<void(int new_num_connections)>;
     virtual std::unique_ptr<Handler>
     handleNotifyNumConnectionsChanged(NotifyNumConnectionsChangedFn fn) = 0;
 
     //! Register handler for network active messages.
     using NotifyNetworkActiveChangedFn =
         std::function<void(bool network_active)>;
     virtual std::unique_ptr<Handler>
     handleNotifyNetworkActiveChanged(NotifyNetworkActiveChangedFn fn) = 0;
 
     //! Register handler for notify alert messages.
     using NotifyAlertChangedFn = std::function<void()>;
     virtual std::unique_ptr<Handler>
     handleNotifyAlertChanged(NotifyAlertChangedFn fn) = 0;
 
     //! Register handler for ban list messages.
     using BannedListChangedFn = std::function<void()>;
     virtual std::unique_ptr<Handler>
     handleBannedListChanged(BannedListChangedFn fn) = 0;
 
     //! Register handler for block tip messages.
     using NotifyBlockTipFn =
         std::function<void(SynchronizationState, interfaces::BlockTip tip,
                            double verification_progress)>;
     virtual std::unique_ptr<Handler>
     handleNotifyBlockTip(NotifyBlockTipFn fn) = 0;
 
     //! Register handler for header tip messages.
     using NotifyHeaderTipFn =
         std::function<void(SynchronizationState, interfaces::BlockTip tip,
                            double verification_progress)>;
     virtual std::unique_ptr<Handler>
     handleNotifyHeaderTip(NotifyHeaderTipFn fn) = 0;
 
     //! Get and set internal node context. Useful for testing, but not
     //! accessible across processes.
     virtual NodeContext *context() { return nullptr; }
     virtual void setContext(NodeContext *context) {}
 };
 
 //! Return implementation of Node interface.
 std::unique_ptr<Node> MakeNode(NodeContext *context = nullptr);
 
 //! Block tip (could be a header or not, depends on the subscribed signal).
 struct BlockTip {
     int block_height;
     int64_t block_time;
     BlockHash block_hash;
 };
 
 } // namespace interfaces
 
 #endif // BITCOIN_INTERFACES_NODE_H
diff --git a/src/interfaces/wallet.cpp b/src/interfaces/wallet.cpp
index 674d49eaf..dc76f43cc 100644
--- a/src/interfaces/wallet.cpp
+++ b/src/interfaces/wallet.cpp
@@ -1,534 +1,570 @@
 // 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.
 
 #include <interfaces/wallet.h>
 
 #include <amount.h>
 #include <chainparams.h>
 #include <config.h>
 #include <consensus/validation.h>
 #include <interfaces/chain.h>
 #include <interfaces/handler.h>
 #include <policy/fees.h>
 #include <primitives/transaction.h>
 #include <rpc/server.h>
 #include <script/standard.h>
 #include <support/allocators/secure.h>
 #include <sync.h>
 #include <util/check.h>
 #include <util/ref.h>
 #include <util/system.h>
 #include <util/ui_change_type.h>
 #include <wallet/context.h>
 #include <wallet/fees.h>
 #include <wallet/ismine.h>
 #include <wallet/load.h>
 #include <wallet/rpcdump.h>
 #include <wallet/wallet.h>
 
 namespace interfaces {
 namespace {
 
     //! Construct wallet tx struct.
     WalletTx MakeWalletTx(CWallet &wallet, const CWalletTx &wtx) {
         LOCK(wallet.cs_wallet);
         WalletTx result;
         result.tx = wtx.tx;
         result.txin_is_mine.reserve(wtx.tx->vin.size());
         for (const auto &txin : wtx.tx->vin) {
             result.txin_is_mine.emplace_back(wallet.IsMine(txin));
         }
         result.txout_is_mine.reserve(wtx.tx->vout.size());
         result.txout_address.reserve(wtx.tx->vout.size());
         result.txout_address_is_mine.reserve(wtx.tx->vout.size());
         for (const auto &txout : wtx.tx->vout) {
             result.txout_is_mine.emplace_back(wallet.IsMine(txout));
             result.txout_address.emplace_back();
             result.txout_address_is_mine.emplace_back(
                 ExtractDestination(txout.scriptPubKey,
                                    result.txout_address.back())
                     ? wallet.IsMine(result.txout_address.back())
                     : ISMINE_NO);
         }
         result.credit = wtx.GetCredit(ISMINE_ALL);
         result.debit = wtx.GetDebit(ISMINE_ALL);
         result.change = wtx.GetChange();
         result.time = wtx.GetTxTime();
         result.value_map = wtx.mapValue;
         result.is_coinbase = wtx.IsCoinBase();
         return result;
     }
 
     //! Construct wallet tx status struct.
     WalletTxStatus MakeWalletTxStatus(CWallet &wallet, const CWalletTx &wtx) {
         WalletTxStatus result;
         result.block_height = wtx.m_confirm.block_height > 0
                                   ? wtx.m_confirm.block_height
                                   : std::numeric_limits<int>::max();
         result.blocks_to_maturity = wtx.GetBlocksToMaturity();
         result.depth_in_main_chain = wtx.GetDepthInMainChain();
         result.time_received = wtx.nTimeReceived;
         result.lock_time = wtx.tx->nLockTime;
         TxValidationState state;
         result.is_final =
             wallet.chain().contextualCheckTransactionForCurrentBlock(*wtx.tx,
                                                                      state);
         result.is_trusted = wtx.IsTrusted();
         result.is_abandoned = wtx.isAbandoned();
         result.is_coinbase = wtx.IsCoinBase();
         result.is_in_main_chain = wtx.IsInMainChain();
         return result;
     }
 
     //! Construct wallet TxOut struct.
     WalletTxOut MakeWalletTxOut(CWallet &wallet, const CWalletTx &wtx, int n,
                                 int depth)
         EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet) {
         WalletTxOut result;
         result.txout = wtx.tx->vout[n];
         result.time = wtx.GetTxTime();
         result.depth_in_main_chain = depth;
         result.is_spent = wallet.IsSpent(COutPoint(wtx.GetId(), n));
         return result;
     }
 
     class WalletImpl : public Wallet {
     public:
         explicit WalletImpl(const std::shared_ptr<CWallet> &wallet)
             : m_wallet(wallet) {}
 
         bool encryptWallet(const SecureString &wallet_passphrase) override {
             return m_wallet->EncryptWallet(wallet_passphrase);
         }
         bool isCrypted() override { return m_wallet->IsCrypted(); }
         bool lock() override { return m_wallet->Lock(); }
         bool unlock(const SecureString &wallet_passphrase) override {
             return m_wallet->Unlock(wallet_passphrase);
         }
         bool isLocked() override { return m_wallet->IsLocked(); }
         bool changeWalletPassphrase(
             const SecureString &old_wallet_passphrase,
             const SecureString &new_wallet_passphrase) override {
             return m_wallet->ChangeWalletPassphrase(old_wallet_passphrase,
                                                     new_wallet_passphrase);
         }
         void abortRescan() override { m_wallet->AbortRescan(); }
         bool backupWallet(const std::string &filename) override {
             return m_wallet->BackupWallet(filename);
         }
         std::string getWalletName() override { return m_wallet->GetName(); }
         std::set<CTxDestination>
         getLabelAddresses(const std::string &label) override {
             return m_wallet->GetLabelAddresses(label);
         };
         bool getNewDestination(const OutputType type, const std::string label,
                                CTxDestination &dest) override {
             LOCK(m_wallet->cs_wallet);
             std::string error;
             return m_wallet->GetNewDestination(type, label, dest, error);
         }
         const CChainParams &getChainParams() override {
             return m_wallet->GetChainParams();
         }
         bool getPubKey(const CScript &script, const CKeyID &address,
                        CPubKey &pub_key) override {
             std::unique_ptr<SigningProvider> provider =
                 m_wallet->GetSolvingProvider(script);
             if (provider) {
                 return provider->GetPubKey(address, pub_key);
             }
             return false;
         }
         SigningResult signMessage(const std::string &message,
                                   const PKHash &pkhash,
                                   std::string &str_sig) override {
             return m_wallet->SignMessage(message, pkhash, str_sig);
         }
         bool isSpendable(const CTxDestination &dest) override {
             LOCK(m_wallet->cs_wallet);
             return m_wallet->IsMine(dest) & ISMINE_SPENDABLE;
         }
         bool haveWatchOnly() override {
             auto spk_man = m_wallet->GetLegacyScriptPubKeyMan();
             if (spk_man) {
                 return spk_man->HaveWatchOnly();
             }
             return false;
         };
         bool setAddressBook(const CTxDestination &dest, const std::string &name,
                             const std::string &purpose) override {
             return m_wallet->SetAddressBook(dest, name, purpose);
         }
         bool delAddressBook(const CTxDestination &dest) override {
             return m_wallet->DelAddressBook(dest);
         }
         bool getAddress(const CTxDestination &dest, std::string *name,
                         isminetype *is_mine, std::string *purpose) override {
             LOCK(m_wallet->cs_wallet);
             auto it = m_wallet->m_address_book.find(dest);
             if (it == m_wallet->m_address_book.end() || it->second.IsChange()) {
                 return false;
             }
             if (name) {
                 *name = it->second.GetLabel();
             }
             if (is_mine) {
                 *is_mine = m_wallet->IsMine(dest);
             }
             if (purpose) {
                 *purpose = it->second.purpose;
             }
             return true;
         }
         std::vector<WalletAddress> getAddresses() override {
             LOCK(m_wallet->cs_wallet);
             std::vector<WalletAddress> result;
             for (const auto &item : m_wallet->m_address_book) {
                 if (item.second.IsChange()) {
                     continue;
                 }
                 result.emplace_back(item.first, m_wallet->IsMine(item.first),
                                     item.second.GetLabel(),
                                     item.second.purpose);
             }
             return result;
         }
         bool addDestData(const CTxDestination &dest, const std::string &key,
                          const std::string &value) override {
             LOCK(m_wallet->cs_wallet);
             WalletBatch batch{m_wallet->GetDatabase()};
             return m_wallet->AddDestData(batch, dest, key, value);
         }
         bool eraseDestData(const CTxDestination &dest,
                            const std::string &key) override {
             LOCK(m_wallet->cs_wallet);
             WalletBatch batch{m_wallet->GetDatabase()};
             return m_wallet->EraseDestData(batch, dest, key);
         }
         std::vector<std::string>
         getDestValues(const std::string &prefix) override {
             LOCK(m_wallet->cs_wallet);
             return m_wallet->GetDestValues(prefix);
         }
         void lockCoin(const COutPoint &output) override {
             LOCK(m_wallet->cs_wallet);
             return m_wallet->LockCoin(output);
         }
         void unlockCoin(const COutPoint &output) override {
             LOCK(m_wallet->cs_wallet);
             return m_wallet->UnlockCoin(output);
         }
         bool isLockedCoin(const COutPoint &output) override {
             LOCK(m_wallet->cs_wallet);
             return m_wallet->IsLockedCoin(output);
         }
         void listLockedCoins(std::vector<COutPoint> &outputs) override {
             LOCK(m_wallet->cs_wallet);
             return m_wallet->ListLockedCoins(outputs);
         }
         CTransactionRef
         createTransaction(const std::vector<CRecipient> &recipients,
                           const CCoinControl &coin_control, bool sign,
                           int &change_pos, Amount &fee,
                           bilingual_str &fail_reason) override {
             LOCK(m_wallet->cs_wallet);
             CTransactionRef tx;
             if (!m_wallet->CreateTransaction(recipients, tx, fee, change_pos,
                                              fail_reason, coin_control, sign)) {
                 return {};
             }
             return tx;
         }
         void commitTransaction(CTransactionRef tx, WalletValueMap value_map,
                                WalletOrderForm order_form) override {
             LOCK(m_wallet->cs_wallet);
             m_wallet->CommitTransaction(std::move(tx), std::move(value_map),
                                         std::move(order_form));
         }
         bool transactionCanBeAbandoned(const TxId &txid) override {
             return m_wallet->TransactionCanBeAbandoned(txid);
         }
         bool abandonTransaction(const TxId &txid) override {
             LOCK(m_wallet->cs_wallet);
             return m_wallet->AbandonTransaction(txid);
         }
         CTransactionRef getTx(const TxId &txid) override {
             LOCK(m_wallet->cs_wallet);
             auto mi = m_wallet->mapWallet.find(txid);
             if (mi != m_wallet->mapWallet.end()) {
                 return mi->second.tx;
             }
             return {};
         }
         WalletTx getWalletTx(const TxId &txid) override {
             LOCK(m_wallet->cs_wallet);
             auto mi = m_wallet->mapWallet.find(txid);
             if (mi != m_wallet->mapWallet.end()) {
                 return MakeWalletTx(*m_wallet, mi->second);
             }
             return {};
         }
         std::vector<WalletTx> getWalletTxs() override {
             LOCK(m_wallet->cs_wallet);
             std::vector<WalletTx> result;
             result.reserve(m_wallet->mapWallet.size());
             for (const auto &entry : m_wallet->mapWallet) {
                 result.emplace_back(MakeWalletTx(*m_wallet, entry.second));
             }
             return result;
         }
         bool tryGetTxStatus(const TxId &txid,
                             interfaces::WalletTxStatus &tx_status,
                             int &num_blocks, int64_t &block_time) override {
             TRY_LOCK(m_wallet->cs_wallet, locked_wallet);
             if (!locked_wallet) {
                 return false;
             }
             auto mi = m_wallet->mapWallet.find(txid);
             if (mi == m_wallet->mapWallet.end()) {
                 return false;
             }
             num_blocks = m_wallet->GetLastBlockHeight();
             block_time = -1;
             CHECK_NONFATAL(m_wallet->chain().findBlock(
                 m_wallet->GetLastBlockHash(), FoundBlock().time(block_time)));
             tx_status = MakeWalletTxStatus(*m_wallet, mi->second);
             return true;
         }
         WalletTx getWalletTxDetails(const TxId &txid, WalletTxStatus &tx_status,
                                     WalletOrderForm &order_form,
                                     bool &in_mempool,
                                     int &num_blocks) override {
             LOCK(m_wallet->cs_wallet);
             auto mi = m_wallet->mapWallet.find(txid);
             if (mi != m_wallet->mapWallet.end()) {
                 num_blocks = m_wallet->GetLastBlockHeight();
                 in_mempool = mi->second.InMempool();
                 order_form = mi->second.vOrderForm;
                 tx_status = MakeWalletTxStatus(*m_wallet, mi->second);
                 return MakeWalletTx(*m_wallet, mi->second);
             }
             return {};
         }
         TransactionError fillPSBT(SigHashType sighash_type, bool sign,
                                   bool bip32derivs,
                                   PartiallySignedTransaction &psbtx,
                                   bool &complete) const override {
             return m_wallet->FillPSBT(psbtx, complete, sighash_type, sign,
                                       bip32derivs);
         }
         WalletBalances getBalances() override {
             const auto bal = m_wallet->GetBalance();
             WalletBalances result;
             result.balance = bal.m_mine_trusted;
             result.unconfirmed_balance = bal.m_mine_untrusted_pending;
             result.immature_balance = bal.m_mine_immature;
             result.have_watch_only = haveWatchOnly();
             if (result.have_watch_only) {
                 result.watch_only_balance = bal.m_watchonly_trusted;
                 result.unconfirmed_watch_only_balance =
                     bal.m_watchonly_untrusted_pending;
                 result.immature_watch_only_balance = bal.m_watchonly_immature;
             }
             return result;
         }
         bool tryGetBalances(WalletBalances &balances,
                             BlockHash &block_hash) override {
             TRY_LOCK(m_wallet->cs_wallet, locked_wallet);
             if (!locked_wallet) {
                 return false;
             }
             block_hash = m_wallet->GetLastBlockHash();
             balances = getBalances();
             return true;
         }
         Amount getBalance() override {
             return m_wallet->GetBalance().m_mine_trusted;
         }
         Amount getAvailableBalance(const CCoinControl &coin_control) override {
             return m_wallet->GetAvailableBalance(&coin_control);
         }
         isminetype txinIsMine(const CTxIn &txin) override {
             LOCK(m_wallet->cs_wallet);
             return m_wallet->IsMine(txin);
         }
         isminetype txoutIsMine(const CTxOut &txout) override {
             LOCK(m_wallet->cs_wallet);
             return m_wallet->IsMine(txout);
         }
         Amount getDebit(const CTxIn &txin, isminefilter filter) override {
             LOCK(m_wallet->cs_wallet);
             return m_wallet->GetDebit(txin, filter);
         }
         Amount getCredit(const CTxOut &txout, isminefilter filter) override {
             LOCK(m_wallet->cs_wallet);
             return m_wallet->GetCredit(txout, filter);
         }
         CoinsList listCoins() override {
             LOCK(m_wallet->cs_wallet);
             CoinsList result;
             for (const auto &entry : m_wallet->ListCoins()) {
                 auto &group = result[entry.first];
                 for (const auto &coin : entry.second) {
                     group.emplace_back(COutPoint(coin.tx->GetId(), coin.i),
                                        MakeWalletTxOut(*m_wallet, *coin.tx,
                                                        coin.i, coin.nDepth));
                 }
             }
             return result;
         }
         std::vector<WalletTxOut>
         getCoins(const std::vector<COutPoint> &outputs) override {
             LOCK(m_wallet->cs_wallet);
             std::vector<WalletTxOut> result;
             result.reserve(outputs.size());
             for (const auto &output : outputs) {
                 result.emplace_back();
                 auto it = m_wallet->mapWallet.find(output.GetTxId());
                 if (it != m_wallet->mapWallet.end()) {
                     int depth = it->second.GetDepthInMainChain();
                     if (depth >= 0) {
                         result.back() = MakeWalletTxOut(*m_wallet, it->second,
                                                         output.GetN(), depth);
                     }
                 }
             }
             return result;
         }
         bool hdEnabled() override { return m_wallet->IsHDEnabled(); }
         OutputType getDefaultAddressType() override {
             return m_wallet->m_default_address_type;
         }
         bool canGetAddresses() const override {
             return m_wallet->CanGetAddresses();
         }
         bool privateKeysDisabled() override {
             return m_wallet->IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS);
         }
         Amount getDefaultMaxTxFee() override {
             return m_wallet->m_default_max_tx_fee;
         }
         void remove() override { RemoveWallet(m_wallet); }
         bool isLegacy() override { return m_wallet->IsLegacy(); }
         std::unique_ptr<Handler> handleUnload(UnloadFn fn) override {
             return MakeHandler(m_wallet->NotifyUnload.connect(fn));
         }
         std::unique_ptr<Handler>
         handleShowProgress(ShowProgressFn fn) override {
             return MakeHandler(m_wallet->ShowProgress.connect(fn));
         }
         std::unique_ptr<Handler>
         handleStatusChanged(StatusChangedFn fn) override {
             return MakeHandler(m_wallet->NotifyStatusChanged.connect(
                 [fn](CWallet *) { fn(); }));
         }
         std::unique_ptr<Handler>
         handleAddressBookChanged(AddressBookChangedFn fn) override {
             return MakeHandler(m_wallet->NotifyAddressBookChanged.connect(
                 [fn](CWallet *, const CTxDestination &address,
                      const std::string &label, bool is_mine,
                      const std::string &purpose, ChangeType status) {
                     fn(address, label, is_mine, purpose, status);
                 }));
         }
         std::unique_ptr<Handler>
         handleTransactionChanged(TransactionChangedFn fn) override {
             return MakeHandler(m_wallet->NotifyTransactionChanged.connect(
                 [fn](CWallet *, const TxId &txid, ChangeType status) {
                     fn(txid, status);
                 }));
         }
         std::unique_ptr<Handler>
         handleWatchOnlyChanged(WatchOnlyChangedFn fn) override {
             return MakeHandler(m_wallet->NotifyWatchonlyChanged.connect(fn));
         }
         std::unique_ptr<Handler>
         handleCanGetAddressesChanged(CanGetAddressesChangedFn fn) override {
             return MakeHandler(
                 m_wallet->NotifyCanGetAddressesChanged.connect(fn));
         }
         Amount getRequiredFee(unsigned int tx_bytes) override {
             return GetRequiredFee(*m_wallet, tx_bytes);
         }
         Amount getMinimumFee(unsigned int tx_bytes,
                              const CCoinControl &coin_control) override {
             return GetMinimumFee(*m_wallet, tx_bytes, coin_control);
         }
         CWallet *wallet() override { return m_wallet.get(); }
 
         std::shared_ptr<CWallet> m_wallet;
     };
 
-    class WalletClientImpl : public ChainClient {
+    class WalletClientImpl : public WalletClient {
     public:
         WalletClientImpl(Chain &chain, ArgsManager &args,
                          std::vector<std::string> wallet_filenames)
             : m_wallet_filenames(std::move(wallet_filenames)) {
             m_context.chain = &chain;
             m_context.args = &args;
         }
+        ~WalletClientImpl() override { UnloadWallets(); }
 
+        //! ChainClient methods
         void registerRpcs(const Span<const CRPCCommand> &commands) {
             for (const CRPCCommand &command : commands) {
                 m_rpc_commands.emplace_back(
                     command.category, command.name,
                     [this, &command](const Config &config,
                                      const JSONRPCRequest &request,
                                      UniValue &result, bool last_handler) {
                         return command.actor(config, {request, m_context},
                                              result, last_handler);
                     },
                     command.argNames, command.unique_id);
                 m_rpc_handlers.emplace_back(
                     m_context.chain->handleRpc(m_rpc_commands.back()));
             }
         }
 
         void registerRpcs() override {
             registerRpcs(GetWalletRPCCommands());
             registerRpcs(GetWalletDumpRPCCommands());
         }
         bool verify(const CChainParams &chainParams) override {
             return VerifyWallets(chainParams, *m_context.chain,
                                  m_wallet_filenames);
         }
         bool load(const CChainParams &chainParams) override {
             return LoadWallets(chainParams, *m_context.chain,
                                m_wallet_filenames);
         }
         void start(CScheduler &scheduler) override {
             return StartWallets(scheduler, *Assert(m_context.args));
         }
         void flush() override { return FlushWallets(); }
         void stop() override { return StopWallets(); }
         void setMockTime(int64_t time) override { return SetMockTime(time); }
+
+        //! WalletClient methods
+        std::unique_ptr<Wallet>
+        createWallet(const CChainParams &params, const std::string &name,
+                     const SecureString &passphrase,
+                     uint64_t wallet_creation_flags,
+                     WalletCreationStatus &status, bilingual_str &error,
+                     std::vector<bilingual_str> &warnings) override {
+            std::shared_ptr<CWallet> wallet;
+            status = CreateWallet(params, *m_context.chain, passphrase,
+                                  wallet_creation_flags, name, error, warnings,
+                                  wallet);
+            return MakeWallet(std::move(wallet));
+        }
+        std::unique_ptr<Wallet>
+        loadWallet(const CChainParams &params, const std::string &name,
+                   bilingual_str &error,
+                   std::vector<bilingual_str> &warnings) override {
+            return MakeWallet(LoadWallet(params, *m_context.chain,
+                                         WalletLocation(name), error,
+                                         warnings));
+        }
+        std::string getWalletDir() override { return GetWalletDir().string(); }
+        std::vector<std::string> listWalletDir() override {
+            std::vector<std::string> paths;
+            for (auto &path : ListWalletDir()) {
+                paths.push_back(path.string());
+            }
+            return paths;
+        }
+
         std::vector<std::unique_ptr<Wallet>> getWallets() override {
             std::vector<std::unique_ptr<Wallet>> wallets;
             for (const auto &wallet : GetWallets()) {
                 wallets.emplace_back(MakeWallet(wallet));
             }
             return wallets;
         }
-        ~WalletClientImpl() override { UnloadWallets(); }
+
+        std::unique_ptr<Handler> handleLoadWallet(LoadWalletFn fn) override {
+            return HandleLoadWallet(std::move(fn));
+        }
 
         WalletContext m_context;
         const std::vector<std::string> m_wallet_filenames;
         std::vector<std::unique_ptr<Handler>> m_rpc_handlers;
         std::list<CRPCCommand> m_rpc_commands;
     };
 
 } // namespace
 
 std::unique_ptr<Wallet> MakeWallet(const std::shared_ptr<CWallet> &wallet) {
     return wallet ? std::make_unique<WalletImpl>(wallet) : nullptr;
 }
 
-std::unique_ptr<ChainClient>
+std::unique_ptr<WalletClient>
 MakeWalletClient(Chain &chain, ArgsManager &args,
                  std::vector<std::string> wallet_filenames) {
     return std::make_unique<WalletClientImpl>(chain, args,
                                               std::move(wallet_filenames));
 }
 
 } // namespace interfaces
diff --git a/src/interfaces/wallet.h b/src/interfaces/wallet.h
index 4af8ed5c6..2b8c13bd8 100644
--- a/src/interfaces/wallet.h
+++ b/src/interfaces/wallet.h
@@ -1,380 +1,422 @@
 // 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.
 
 #ifndef BITCOIN_INTERFACES_WALLET_H
 #define BITCOIN_INTERFACES_WALLET_H
 
-#include <amount.h> // For Amount
+#include <amount.h>           // For Amount
+#include <interfaces/chain.h> // For ChainClient
 #include <primitives/blockhash.h>
 #include <primitives/transaction.h> // For CTxOut
 #include <pubkey.h> // For CKeyID and CScriptID (definitions needed in CTxDestination instantiation)
 #include <script/sighashtype.h>
 #include <script/standard.h>           // For CTxDestination
 #include <support/allocators/secure.h> // For SecureString
 #include <util/message.h>
 #include <util/ui_change_type.h>
 
 #include <cstdint>
 #include <functional>
 #include <map>
 #include <memory>
 #include <string>
 #include <tuple>
 #include <utility>
 #include <vector>
 
 class CChainParams;
 class CCoinControl;
 class CKey;
 class CMutableTransaction;
 class COutPoint;
 class CTransaction;
 class CWallet;
 enum class FeeReason;
 enum class OutputType;
 enum class TransactionError;
+enum class WalletCreationStatus;
 enum isminetype : unsigned int;
 struct CRecipient;
 struct PartiallySignedTransaction;
+struct WalletContext;
 typedef uint8_t isminefilter;
 struct TxId;
 struct bilingual_str;
 
 namespace interfaces {
 
 class Handler;
 struct WalletAddress;
 struct WalletBalances;
 struct WalletTx;
 struct WalletTxOut;
 struct WalletTxStatus;
 
 using WalletOrderForm = std::vector<std::pair<std::string, std::string>>;
 using WalletValueMap = std::map<std::string, std::string>;
 
 //! Interface for accessing a wallet.
 class Wallet {
 public:
     virtual ~Wallet() {}
 
     //! Encrypt wallet.
     virtual bool encryptWallet(const SecureString &wallet_passphrase) = 0;
 
     //! Return whether wallet is encrypted.
     virtual bool isCrypted() = 0;
 
     //! Lock wallet.
     virtual bool lock() = 0;
 
     //! Unlock wallet.
     virtual bool unlock(const SecureString &wallet_passphrase) = 0;
 
     //! Return whether wallet is locked.
     virtual bool isLocked() = 0;
 
     //! Change wallet passphrase.
     virtual bool
     changeWalletPassphrase(const SecureString &old_wallet_passphrase,
                            const SecureString &new_wallet_passphrase) = 0;
 
     //! Abort a rescan.
     virtual void abortRescan() = 0;
 
     //! Back up wallet.
     virtual bool backupWallet(const std::string &filename) = 0;
 
     //! Get wallet name.
     virtual std::string getWalletName() = 0;
 
     //! Get chainparams.
     virtual const CChainParams &getChainParams() = 0;
 
     //! Get set of addresses corresponding to a given label.
     virtual std::set<CTxDestination>
     getLabelAddresses(const std::string &label) = 0;
 
     // Get a new address.
     virtual bool getNewDestination(const OutputType type,
                                    const std::string label,
                                    CTxDestination &dest) = 0;
 
     //! Get public key.
     virtual bool getPubKey(const CScript &script, const CKeyID &address,
                            CPubKey &pub_key) = 0;
 
     //! Sign message
     virtual SigningResult signMessage(const std::string &message,
                                       const PKHash &pkhash,
                                       std::string &str_sig) = 0;
 
     //! Return whether wallet has private key.
     virtual bool isSpendable(const CTxDestination &dest) = 0;
 
     //! Return whether wallet has watch only keys.
     virtual bool haveWatchOnly() = 0;
 
     //! Add or update address.
     virtual bool setAddressBook(const CTxDestination &dest,
                                 const std::string &name,
                                 const std::string &purpose) = 0;
 
     // Remove address.
     virtual bool delAddressBook(const CTxDestination &dest) = 0;
 
     //! Look up address in wallet, return whether exists.
     virtual bool getAddress(const CTxDestination &dest, std::string *name,
                             isminetype *is_mine, std::string *purpose) = 0;
 
     //! Get wallet address list.
     virtual std::vector<WalletAddress> getAddresses() = 0;
 
     //! Add dest data.
     virtual bool addDestData(const CTxDestination &dest, const std::string &key,
                              const std::string &value) = 0;
 
     //! Erase dest data.
     virtual bool eraseDestData(const CTxDestination &dest,
                                const std::string &key) = 0;
 
     //! Get dest values with prefix.
     virtual std::vector<std::string>
     getDestValues(const std::string &prefix) = 0;
 
     //! Lock coin.
     virtual void lockCoin(const COutPoint &output) = 0;
 
     //! Unlock coin.
     virtual void unlockCoin(const COutPoint &output) = 0;
 
     //! Return whether coin is locked.
     virtual bool isLockedCoin(const COutPoint &output) = 0;
 
     //! List locked coins.
     virtual void listLockedCoins(std::vector<COutPoint> &outputs) = 0;
 
     //! Create transaction.
     virtual CTransactionRef
     createTransaction(const std::vector<CRecipient> &recipients,
                       const CCoinControl &coin_control, bool sign,
                       int &change_pos, Amount &fee,
                       bilingual_str &fail_reason) = 0;
 
     //! Commit transaction.
     virtual void commitTransaction(CTransactionRef tx, WalletValueMap value_map,
                                    WalletOrderForm order_form) = 0;
 
     //! Return whether transaction can be abandoned.
     virtual bool transactionCanBeAbandoned(const TxId &txid) = 0;
 
     //! Abandon transaction.
     virtual bool abandonTransaction(const TxId &txid) = 0;
 
     //! Get a transaction.
     virtual CTransactionRef getTx(const TxId &txid) = 0;
 
     //! Get transaction information.
     virtual WalletTx getWalletTx(const TxId &txid) = 0;
 
     //! Get list of all wallet transactions.
     virtual std::vector<WalletTx> getWalletTxs() = 0;
 
     //! Try to get updated status for a particular transaction, if possible
     //! without blocking.
     virtual bool tryGetTxStatus(const TxId &txid, WalletTxStatus &tx_status,
                                 int &num_blocks, int64_t &block_time) = 0;
 
     //! Get transaction details.
     virtual WalletTx getWalletTxDetails(const TxId &txid,
                                         WalletTxStatus &tx_status,
                                         WalletOrderForm &order_form,
                                         bool &in_mempool, int &num_blocks) = 0;
 
     //! Fill PSBT.
     virtual TransactionError fillPSBT(SigHashType sighash_type, bool sign,
                                       bool bip32derivs,
                                       PartiallySignedTransaction &psbtx,
                                       bool &complete) const = 0;
 
     //! Get balances.
     virtual WalletBalances getBalances() = 0;
 
     //! Get balances if possible without blocking.
     virtual bool tryGetBalances(WalletBalances &balances,
                                 BlockHash &block_hash) = 0;
 
     //! Get balance.
     virtual Amount getBalance() = 0;
 
     //! Get available balance.
     virtual Amount getAvailableBalance(const CCoinControl &coin_control) = 0;
 
     //! Return whether transaction input belongs to wallet.
     virtual isminetype txinIsMine(const CTxIn &txin) = 0;
 
     //! Return whether transaction output belongs to wallet.
     virtual isminetype txoutIsMine(const CTxOut &txout) = 0;
 
     //! Return debit amount if transaction input belongs to wallet.
     virtual Amount getDebit(const CTxIn &txin, isminefilter filter) = 0;
 
     //! Return credit amount if transaction input belongs to wallet.
     virtual Amount getCredit(const CTxOut &txout, isminefilter filter) = 0;
 
     //! Return AvailableCoins + LockedCoins grouped by wallet address.
     //! (put change in one group with wallet address)
     using CoinsList = std::map<CTxDestination,
                                std::vector<std::tuple<COutPoint, WalletTxOut>>>;
     virtual CoinsList listCoins() = 0;
 
     //! Return wallet transaction output information.
     virtual std::vector<WalletTxOut>
     getCoins(const std::vector<COutPoint> &outputs) = 0;
 
     //! Get required fee.
     virtual Amount getRequiredFee(unsigned int tx_bytes) = 0;
 
     //! Get minimum fee.
     virtual Amount getMinimumFee(unsigned int tx_bytes,
                                  const CCoinControl &coin_control) = 0;
 
     // Return whether HD enabled.
     virtual bool hdEnabled() = 0;
 
     // Return whether the wallet is blank.
     virtual bool canGetAddresses() const = 0;
 
     // Return whether private keys enabled.
     virtual bool privateKeysDisabled() = 0;
 
     // Get default address type.
     virtual OutputType getDefaultAddressType() = 0;
 
     //! Get max tx fee.
     virtual Amount getDefaultMaxTxFee() = 0;
 
     // Remove wallet.
     virtual void remove() = 0;
 
     //! Return whether is a legacy wallet
     virtual bool isLegacy() = 0;
 
     //! Register handler for unload message.
     using UnloadFn = std::function<void()>;
     virtual std::unique_ptr<Handler> handleUnload(UnloadFn fn) = 0;
 
     //! Register handler for show progress messages.
     using ShowProgressFn =
         std::function<void(const std::string &title, int progress)>;
     virtual std::unique_ptr<Handler> handleShowProgress(ShowProgressFn fn) = 0;
 
     //! Register handler for status changed messages.
     using StatusChangedFn = std::function<void()>;
     virtual std::unique_ptr<Handler>
     handleStatusChanged(StatusChangedFn fn) = 0;
 
     //! Register handler for address book changed messages.
     using AddressBookChangedFn = std::function<void(
         const CTxDestination &address, const std::string &label, bool is_mine,
         const std::string &purpose, ChangeType status)>;
     virtual std::unique_ptr<Handler>
     handleAddressBookChanged(AddressBookChangedFn fn) = 0;
 
     //! Register handler for transaction changed messages.
     using TransactionChangedFn =
         std::function<void(const TxId &txid, ChangeType status)>;
     virtual std::unique_ptr<Handler>
     handleTransactionChanged(TransactionChangedFn fn) = 0;
 
     //! Register handler for watchonly changed messages.
     using WatchOnlyChangedFn = std::function<void(bool have_watch_only)>;
     virtual std::unique_ptr<Handler>
     handleWatchOnlyChanged(WatchOnlyChangedFn fn) = 0;
 
     //! Register handler for keypool changed messages.
     using CanGetAddressesChangedFn = std::function<void()>;
     virtual std::unique_ptr<Handler>
     handleCanGetAddressesChanged(CanGetAddressesChangedFn fn) = 0;
 
     //! Return pointer to internal wallet class, useful for testing.
     virtual CWallet *wallet() { return nullptr; }
 };
 
+//! Wallet chain client that in addition to having chain client methods for
+//! starting up, shutting down, and registering RPCs, also has additional
+//! methods (called by the GUI) to load and create wallets.
+class WalletClient : public ChainClient {
+public:
+    //! Create new wallet.
+    virtual std::unique_ptr<Wallet>
+    createWallet(const CChainParams &params, const std::string &name,
+                 const SecureString &passphrase, uint64_t wallet_creation_flags,
+                 WalletCreationStatus &status, bilingual_str &error,
+                 std::vector<bilingual_str> &warnings) = 0;
+
+    //! Load existing wallet.
+    virtual std::unique_ptr<Wallet>
+    loadWallet(const CChainParams &params, const std::string &name,
+               bilingual_str &error, std::vector<bilingual_str> &warnings) = 0;
+
+    //! Return default wallet directory.
+    virtual std::string getWalletDir() = 0;
+
+    //! Return available wallets in wallet directory.
+    virtual std::vector<std::string> listWalletDir() = 0;
+
+    //! Return interfaces for accessing wallets (if any).
+    virtual std::vector<std::unique_ptr<Wallet>> getWallets() = 0;
+
+    //! Register handler for load wallet messages. This callback is triggered by
+    //! createWallet and loadWallet above, and also triggered when wallets are
+    //! loaded at startup or by RPC.
+    using LoadWalletFn = std::function<void(std::unique_ptr<Wallet> wallet)>;
+    virtual std::unique_ptr<Handler> handleLoadWallet(LoadWalletFn fn) = 0;
+};
+
 //! Information about one wallet address.
 struct WalletAddress {
     CTxDestination dest;
     isminetype is_mine;
     std::string name;
     std::string purpose;
 
     WalletAddress(CTxDestination destIn, isminetype isMineIn,
                   std::string nameIn, std::string purposeIn)
         : dest(std::move(destIn)), is_mine(isMineIn), name(std::move(nameIn)),
           purpose(std::move(purposeIn)) {}
 };
 
 //! Collection of wallet balances.
 struct WalletBalances {
     Amount balance = Amount::zero();
     Amount unconfirmed_balance = Amount::zero();
     Amount immature_balance = Amount::zero();
     bool have_watch_only = false;
     Amount watch_only_balance = Amount::zero();
     Amount unconfirmed_watch_only_balance = Amount::zero();
     Amount immature_watch_only_balance = Amount::zero();
 
     bool balanceChanged(const WalletBalances &prev) const {
         return balance != prev.balance ||
                unconfirmed_balance != prev.unconfirmed_balance ||
                immature_balance != prev.immature_balance ||
                watch_only_balance != prev.watch_only_balance ||
                unconfirmed_watch_only_balance !=
                    prev.unconfirmed_watch_only_balance ||
                immature_watch_only_balance != prev.immature_watch_only_balance;
     }
 };
 
 // Wallet transaction information.
 struct WalletTx {
     CTransactionRef tx;
     std::vector<isminetype> txin_is_mine;
     std::vector<isminetype> txout_is_mine;
     std::vector<CTxDestination> txout_address;
     std::vector<isminetype> txout_address_is_mine;
     Amount credit;
     Amount debit;
     Amount change;
     int64_t time;
     std::map<std::string, std::string> value_map;
     bool is_coinbase;
 };
 
 //! Updated transaction status.
 struct WalletTxStatus {
     int block_height;
     int blocks_to_maturity;
     int depth_in_main_chain;
     unsigned int time_received;
     uint32_t lock_time;
     bool is_final;
     bool is_trusted;
     bool is_abandoned;
     bool is_coinbase;
     bool is_in_main_chain;
 };
 
 //! Wallet transaction output.
 struct WalletTxOut {
     CTxOut txout;
     int64_t time;
     int depth_in_main_chain = -1;
     bool is_spent = false;
 };
 
 //! Return implementation of Wallet interface. This function is defined in
 //! dummywallet.cpp and throws if the wallet component is not compiled.
 std::unique_ptr<Wallet> MakeWallet(const std::shared_ptr<CWallet> &wallet);
 
+//! Return implementation of ChainClient interface for a wallet client. This
+//! function will be undefined in builds where ENABLE_WALLET is false.
+std::unique_ptr<WalletClient>
+MakeWalletClient(Chain &chain, ArgsManager &args,
+                 std::vector<std::string> wallet_filenames);
+
 } // namespace interfaces
 
 #endif // BITCOIN_INTERFACES_WALLET_H
diff --git a/src/node/context.h b/src/node/context.h
index 2575934d7..0a896f526 100644
--- a/src/node/context.h
+++ b/src/node/context.h
@@ -1,56 +1,62 @@
 // Copyright (c) 2019 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #ifndef BITCOIN_NODE_CONTEXT_H
 #define BITCOIN_NODE_CONTEXT_H
 
 #include <cassert>
 #include <functional>
 #include <memory>
 #include <vector>
 
 class ArgsManager;
 class BanMan;
 class CConnman;
 class CScheduler;
 class CTxMemPool;
 class ChainstateManager;
 class PeerManager;
 namespace interfaces {
 class Chain;
 class ChainClient;
+class WalletClient;
 } // namespace interfaces
 
 //! NodeContext struct containing references to chain state and connection
 //! state.
 //!
 //! This is used by init, rpc, and test code to pass object references around
 //! without needing to declare the same variables and parameters repeatedly, or
 //! to use globals. More variables could be added to this struct (particularly
 //! references to validation objects) to eliminate use of globals
 //! and make code more modular and testable. The struct isn't intended to have
 //! any member functions. It should just be a collection of references that can
 //! be used without pulling in unwanted dependencies or functionality.
 struct NodeContext {
     std::unique_ptr<CConnman> connman;
     std::unique_ptr<CTxMemPool> mempool;
     std::unique_ptr<PeerManager> peerman;
     // Currently a raw pointer because the memory is not managed by this struct
     ChainstateManager *chainman{nullptr};
     std::unique_ptr<BanMan> banman;
     // Currently a raw pointer because the memory is not managed by this struct
     ArgsManager *args{nullptr};
     std::unique_ptr<interfaces::Chain> chain;
+    //! List of all chain clients (wallet processes or other client) connected
+    //! to node.
     std::vector<std::unique_ptr<interfaces::ChainClient>> chain_clients;
+    //! Reference to chain client that should used to load or create wallets
+    //! opened by the gui.
+    interfaces::WalletClient *wallet_client{nullptr};
     std::unique_ptr<CScheduler> scheduler;
     std::function<void()> rpc_interruption_point = [] {};
 
     //! Declare default constructor and destructor that are not inline, so code
     //! instantiating the NodeContext struct doesn't need to #include class
     //! definitions for all the unique_ptr members.
     NodeContext();
     ~NodeContext();
 };
 
 #endif // BITCOIN_NODE_CONTEXT_H
diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
index f46e35e2e..55da0bba1 100644
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -1,810 +1,812 @@
 // Copyright (c) 2011-2019 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/bitcoin.h>
 
 #include <chainparams.h>
 #include <config.h>
 #include <httprpc.h>
 #include <init.h>
 #include <interfaces/handler.h>
 #include <interfaces/node.h>
 #include <node/context.h>
 #include <node/ui_interface.h>
 #include <noui.h>
 #include <qt/bitcoingui.h>
 #include <qt/clientmodel.h>
 #include <qt/guiconstants.h>
 #include <qt/guiutil.h>
 #include <qt/intro.h>
 #include <qt/networkstyle.h>
 #include <qt/optionsmodel.h>
 #include <qt/platformstyle.h>
 #include <qt/splashscreen.h>
 #include <qt/utilitydialog.h>
 #include <qt/winshutdownmonitor.h>
 #include <uint256.h>
 #include <util/ref.h>
 #include <util/system.h>
 #include <util/threadnames.h>
 #include <util/translation.h>
 #include <validation.h>
 
 #ifdef ENABLE_WALLET
 #include <qt/paymentserver.h>
 #include <qt/walletcontroller.h>
 #include <qt/walletmodel.h>
 #endif // ENABLE_WALLET
 
 #include <QDebug>
 #include <QLibraryInfo>
 #include <QLocale>
 #include <QMessageBox>
 #include <QSettings>
 #include <QStringList>
 #include <QThread>
 #include <QTimer>
 #include <QTranslator>
 
 #include <boost/signals2/connection.hpp>
 
 #if defined(QT_STATICPLUGIN)
 #include <QtPlugin>
 #if defined(QT_QPA_PLATFORM_XCB)
 Q_IMPORT_PLUGIN(QXcbIntegrationPlugin);
 #elif defined(QT_QPA_PLATFORM_WINDOWS)
 Q_IMPORT_PLUGIN(QWindowsIntegrationPlugin);
 #elif defined(QT_QPA_PLATFORM_COCOA)
 Q_IMPORT_PLUGIN(QCocoaIntegrationPlugin);
 #endif
 #endif
 
 // Declare meta types used for QMetaObject::invokeMethod
 Q_DECLARE_METATYPE(bool *)
 Q_DECLARE_METATYPE(Amount)
 Q_DECLARE_METATYPE(SynchronizationState)
 Q_DECLARE_METATYPE(uint256)
 
 // Config is non-copyable so we can only register pointers to it
 Q_DECLARE_METATYPE(Config *)
 
 static void RegisterMetaTypes() {
     // Register meta types used for QMetaObject::invokeMethod and
     // Qt::QueuedConnection
     qRegisterMetaType<bool *>();
     qRegisterMetaType<SynchronizationState>();
 #ifdef ENABLE_WALLET
     qRegisterMetaType<WalletModel *>();
 #endif
     qRegisterMetaType<Amount>();
     // Register typedefs (see
     // http://qt-project.org/doc/qt-5/qmetatype.html#qRegisterMetaType)
     qRegisterMetaType<size_t>("size_t");
 
     qRegisterMetaType<std::function<void()>>("std::function<void()>");
     qRegisterMetaType<QMessageBox::Icon>("QMessageBox::Icon");
     qRegisterMetaType<interfaces::BlockAndHeaderTipInfo>(
         "interfaces::BlockAndHeaderTipInfo");
 
     // Need to register any types Qt doesn't know about if you intend
     // to use them with the signal/slot mechanism Qt provides. Even pointers.
     // Note that class Config is noncopyable and so we can't register a
     // non-pointer version of it with Qt, because Qt expects to be able to
     // copy-construct non-pointers to objects for invoking slots
     // behind-the-scenes in the 'Queued' connection case.
     qRegisterMetaType<Config *>();
 }
 
 static QString GetLangTerritory() {
     QSettings settings;
     // Get desired locale (e.g. "de_DE")
     // 1) System default language
     QString lang_territory = QLocale::system().name();
     // 2) Language from QSettings
     QString lang_territory_qsettings =
         settings.value("language", "").toString();
     if (!lang_territory_qsettings.isEmpty()) {
         lang_territory = lang_territory_qsettings;
     }
     // 3) -lang command line argument
     lang_territory = QString::fromStdString(
         gArgs.GetArg("-lang", lang_territory.toStdString()));
     return lang_territory;
 }
 
 /** Set up translations */
 static void initTranslations(QTranslator &qtTranslatorBase,
                              QTranslator &qtTranslator,
                              QTranslator &translatorBase,
                              QTranslator &translator) {
     // Remove old translators
     QApplication::removeTranslator(&qtTranslatorBase);
     QApplication::removeTranslator(&qtTranslator);
     QApplication::removeTranslator(&translatorBase);
     QApplication::removeTranslator(&translator);
 
     // Get desired locale (e.g. "de_DE")
     // 1) System default language
     QString lang_territory = GetLangTerritory();
 
     // Convert to "de" only by truncating "_DE"
     QString lang = lang_territory;
     lang.truncate(lang_territory.lastIndexOf('_'));
 
     // Load language files for configured locale:
     // - First load the translator for the base language, without territory
     // - Then load the more specific locale translator
 
     // Load e.g. qt_de.qm
     if (qtTranslatorBase.load(
             "qt_" + lang,
             QLibraryInfo::location(QLibraryInfo::TranslationsPath))) {
         QApplication::installTranslator(&qtTranslatorBase);
     }
 
     // Load e.g. qt_de_DE.qm
     if (qtTranslator.load(
             "qt_" + lang_territory,
             QLibraryInfo::location(QLibraryInfo::TranslationsPath))) {
         QApplication::installTranslator(&qtTranslator);
     }
 
     // Load e.g. bitcoin_de.qm (shortcut "de" needs to be defined in
     // bitcoin.qrc)
     if (translatorBase.load(lang, ":/translations/")) {
         QApplication::installTranslator(&translatorBase);
     }
 
     // Load e.g. bitcoin_de_DE.qm (shortcut "de_DE" needs to be defined in
     // bitcoin.qrc)
     if (translator.load(lang_territory, ":/translations/")) {
         QApplication::installTranslator(&translator);
     }
 }
 
 /* qDebug() message handler --> debug.log */
 void DebugMessageHandler(QtMsgType type, const QMessageLogContext &context,
                          const QString &msg) {
     Q_UNUSED(context);
     if (type == QtDebugMsg) {
         LogPrint(BCLog::QT, "GUI: %s\n", msg.toStdString());
     } else {
         LogPrintf("GUI: %s\n", msg.toStdString());
     }
 }
 
 BitcoinABC::BitcoinABC(interfaces::Node &node) : QObject(), m_node(node) {}
 
 void BitcoinABC::handleRunawayException(const std::exception *e) {
     PrintExceptionContinue(e, "Runaway exception");
     Q_EMIT runawayException(
         QString::fromStdString(m_node.getWarnings().translated));
 }
 
 void BitcoinABC::initialize(Config *config, RPCServer *rpcServer,
                             HTTPRPCRequestProcessor *httpRPCRequestProcessor) {
     try {
         qDebug() << __func__ << ": Running initialization in thread";
         util::ThreadRename("qt-init");
 
         interfaces::BlockAndHeaderTipInfo tip_info;
         bool rv = m_node.appInitMain(*config, *rpcServer,
                                      *httpRPCRequestProcessor, &tip_info);
         Q_EMIT initializeResult(rv, tip_info);
     } catch (const std::exception &e) {
         handleRunawayException(&e);
     } catch (...) {
         handleRunawayException(nullptr);
     }
 }
 
 void BitcoinABC::shutdown() {
     try {
         qDebug() << __func__ << ": Running Shutdown in thread";
         m_node.appShutdown();
         qDebug() << __func__ << ": Shutdown finished";
         Q_EMIT shutdownResult();
     } catch (const std::exception &e) {
         handleRunawayException(&e);
     } catch (...) {
         handleRunawayException(nullptr);
     }
 }
 
 static int qt_argc = 1;
 static const char *qt_argv = "bitcoin-qt";
 
 BitcoinApplication::BitcoinApplication()
     : QApplication(qt_argc, const_cast<char **>(&qt_argv)), coreThread(nullptr),
       optionsModel(nullptr), clientModel(nullptr), window(nullptr),
       pollShutdownTimer(nullptr), returnValue(0), platformStyle(nullptr) {
     // Qt runs setlocale(LC_ALL, "") on initialization.
     RegisterMetaTypes();
     setQuitOnLastWindowClosed(false);
 }
 
 void BitcoinApplication::setupPlatformStyle() {
     // UI per-platform customization
     // This must be done inside the BitcoinApplication constructor, or after it,
     // because PlatformStyle::instantiate requires a QApplication.
     std::string platformName;
     platformName = gArgs.GetArg("-uiplatform", BitcoinGUI::DEFAULT_UIPLATFORM);
     platformStyle =
         PlatformStyle::instantiate(QString::fromStdString(platformName));
     // Fall back to "other" if specified name not found.
     if (!platformStyle) {
         platformStyle = PlatformStyle::instantiate("other");
     }
     assert(platformStyle);
 }
 
 BitcoinApplication::~BitcoinApplication() {
     if (coreThread) {
         qDebug() << __func__ << ": Stopping thread";
         coreThread->quit();
         coreThread->wait();
         qDebug() << __func__ << ": Stopped thread";
     }
 
     delete window;
     window = nullptr;
     delete platformStyle;
     platformStyle = nullptr;
 }
 
 #ifdef ENABLE_WALLET
 void BitcoinApplication::createPaymentServer() {
     paymentServer = new PaymentServer(this);
 }
 #endif
 
 void BitcoinApplication::createOptionsModel(bool resetSettings) {
     optionsModel = new OptionsModel(this, resetSettings);
 }
 
 void BitcoinApplication::createWindow(const Config *config,
                                       const NetworkStyle *networkStyle) {
     window =
         new BitcoinGUI(node(), config, platformStyle, networkStyle, nullptr);
 
     pollShutdownTimer = new QTimer(window);
     connect(pollShutdownTimer, &QTimer::timeout, window,
             &BitcoinGUI::detectShutdown);
 }
 
 void BitcoinApplication::createSplashScreen(const NetworkStyle *networkStyle) {
     assert(!m_splash);
     m_splash = new SplashScreen(networkStyle);
     // We don't hold a direct pointer to the splash screen after creation, but
     // the splash screen will take care of deleting itself when finish()
     // happens.
     m_splash->show();
+    connect(this, &BitcoinApplication::requestedInitialize, m_splash,
+            &SplashScreen::handleLoadWallet);
     connect(this, &BitcoinApplication::splashFinished, m_splash,
             &SplashScreen::finish);
     connect(this, &BitcoinApplication::requestedShutdown, m_splash,
             &QWidget::close);
 }
 
 void BitcoinApplication::setNode(interfaces::Node &node) {
     assert(!m_node);
     m_node = &node;
     if (optionsModel) {
         optionsModel->setNode(*m_node);
     }
     if (m_splash) {
         m_splash->setNode(*m_node);
     }
 }
 
 bool BitcoinApplication::baseInitialize(Config &config) {
     return node().baseInitialize(config);
 }
 
 void BitcoinApplication::startThread() {
     if (coreThread) {
         return;
     }
     coreThread = new QThread(this);
     BitcoinABC *executor = new BitcoinABC(node());
     executor->moveToThread(coreThread);
 
     /*  communication to and from thread */
     connect(executor, &BitcoinABC::initializeResult, this,
             &BitcoinApplication::initializeResult);
     connect(executor, &BitcoinABC::shutdownResult, this,
             &BitcoinApplication::shutdownResult);
     connect(executor, &BitcoinABC::runawayException, this,
             &BitcoinApplication::handleRunawayException);
 
     // Note on how Qt works: it tries to directly invoke methods if the signal
     // is emitted on the same thread that the target object 'lives' on.
     // But if the target object 'lives' on another thread (executor here does)
     // the SLOT will be invoked asynchronously at a later time in the thread
     // of the target object.  So.. we pass a pointer around.  If you pass
     // a reference around (even if it's non-const) you'll get Qt generating
     // code to copy-construct the parameter in question (Q_DECLARE_METATYPE
     // and qRegisterMetaType generate this code).  For the Config class,
     // which is noncopyable, we can't do this.  So.. we have to pass
     // pointers to Config around.  Make sure Config &/Config * isn't a
     // temporary (eg it lives somewhere aside from the stack) or this will
     // crash because initialize() gets executed in another thread at some
     // unspecified time (after) requestedInitialize() is emitted!
     connect(this, &BitcoinApplication::requestedInitialize, executor,
             &BitcoinABC::initialize);
 
     connect(this, &BitcoinApplication::requestedShutdown, executor,
             &BitcoinABC::shutdown);
     /*  make sure executor object is deleted in its own thread */
     connect(coreThread, &QThread::finished, executor, &QObject::deleteLater);
 
     coreThread->start();
 }
 
 void BitcoinApplication::parameterSetup() {
     // Default printtoconsole to false for the GUI. GUI programs should not
     // print to the console unnecessarily.
     gArgs.SoftSetBoolArg("-printtoconsole", false);
 
     InitLogging(gArgs);
     InitParameterInteraction(gArgs);
 }
 
 void BitcoinApplication::InitializePruneSetting(bool prune) {
     // If prune is set, intentionally override existing prune size with
     // the default size since this is called when choosing a new datadir.
     optionsModel->SetPruneTargetGB(prune ? DEFAULT_PRUNE_TARGET_GB : 0, true);
 }
 
 void BitcoinApplication::requestInitialize(
     Config &config, RPCServer &rpcServer,
     HTTPRPCRequestProcessor &httpRPCRequestProcessor) {
     qDebug() << __func__ << ": Requesting initialize";
     startThread();
     // IMPORTANT: config must NOT be a reference to a temporary because below
     // signal may be connected to a slot that will be executed as a queued
     // connection in another thread!
     Q_EMIT requestedInitialize(&config, &rpcServer, &httpRPCRequestProcessor);
 }
 
 void BitcoinApplication::requestShutdown(Config &config) {
     // Show a simple window indicating shutdown status. Do this first as some of
     // the steps may take some time below, for example the RPC console may still
     // be executing a command.
     shutdownWindow.reset(ShutdownWindow::showShutdownWindow(window));
 
     qDebug() << __func__ << ": Requesting shutdown";
     startThread();
     window->hide();
     // Must disconnect node signals otherwise current thread can deadlock since
     // no event loop is running.
     window->unsubscribeFromCoreSignals();
     // Request node shutdown, which can interrupt long operations, like
     // rescanning a wallet.
     node().startShutdown();
     // Unsetting the client model can cause the current thread to wait for node
     // to complete an operation, like wait for a RPC execution to complete.
     window->setClientModel(nullptr);
     pollShutdownTimer->stop();
 
     delete clientModel;
     clientModel = nullptr;
 
     // Request shutdown from core thread
     Q_EMIT requestedShutdown();
 }
 
 void BitcoinApplication::initializeResult(
     bool success, interfaces::BlockAndHeaderTipInfo tip_info) {
     qDebug() << __func__ << ": Initialization result: " << success;
     returnValue = success ? EXIT_SUCCESS : EXIT_FAILURE;
     if (!success) {
         // Make sure splash screen doesn't stick around during shutdown.
         Q_EMIT splashFinished();
         // Exit first main loop invocation.
         quit();
         return;
     }
     // Log this only after AppInitMain finishes, as then logging setup is
     // guaranteed complete.
     qInfo() << "Platform customization:" << platformStyle->getName();
     clientModel = new ClientModel(node(), optionsModel);
     window->setClientModel(clientModel, &tip_info);
 #ifdef ENABLE_WALLET
     if (WalletModel::isWalletEnabled()) {
         m_wallet_controller =
             new WalletController(*clientModel, platformStyle, this);
         window->setWalletController(m_wallet_controller);
         if (paymentServer) {
             paymentServer->setOptionsModel(optionsModel);
 #ifdef ENABLE_BIP70
             PaymentServer::LoadRootCAs();
             connect(m_wallet_controller, &WalletController::coinsSent,
                     paymentServer, &PaymentServer::fetchPaymentACK);
 #endif
         }
     }
 #endif // ENABLE_WALLET
 
     // If -min option passed, start window minimized(iconified)
     // or minimized to tray
     if (!gArgs.GetBoolArg("-min", false)) {
         window->show();
     } else if (clientModel->getOptionsModel()->getMinimizeToTray() &&
                window->hasTrayIcon()) {
         // do nothing as the window is managed by the tray icon
     } else {
         window->showMinimized();
     }
     Q_EMIT splashFinished();
     Q_EMIT windowShown(window);
 
 #ifdef ENABLE_WALLET
     // Now that initialization/startup is done, process any command-line
     // bitcoincash: URIs or payment requests:
     if (paymentServer) {
         connect(paymentServer, &PaymentServer::receivedPaymentRequest, window,
                 &BitcoinGUI::handlePaymentRequest);
         connect(window, &BitcoinGUI::receivedURI, paymentServer,
                 &PaymentServer::handleURIOrFile);
         connect(paymentServer, &PaymentServer::message,
                 [this](const QString &title, const QString &message,
                        unsigned int style) {
                     window->message(title, message, style);
                 });
         QTimer::singleShot(100, paymentServer, &PaymentServer::uiReady);
     }
 #endif
 
     pollShutdownTimer->start(200);
 }
 
 void BitcoinApplication::shutdownResult() {
     // Exit second main loop invocation after shutdown finished.
     quit();
 }
 
 void BitcoinApplication::handleRunawayException(const QString &message) {
     QMessageBox::critical(
         nullptr, "Runaway exception",
         BitcoinGUI::tr("A fatal error occurred. %1 can no longer continue "
                        "safely and will quit.")
                 .arg(PACKAGE_NAME) +
             QString("<br><br>") + message);
     ::exit(EXIT_FAILURE);
 }
 
 WId BitcoinApplication::getMainWinId() const {
     if (!window) {
         return 0;
     }
 
     return window->winId();
 }
 
 static void SetupUIArgs(ArgsManager &argsman) {
 #if defined(ENABLE_WALLET) && defined(ENABLE_BIP70)
     argsman.AddArg(
         "-allowselfsignedrootcertificates",
         strprintf("Allow self signed root certificates (default: %d)",
                   DEFAULT_SELFSIGNED_ROOTCERTS),
         ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::GUI);
 #endif
     argsman.AddArg("-choosedatadir",
                    strprintf("Choose data directory on startup (default: %d)",
                              DEFAULT_CHOOSE_DATADIR),
                    ArgsManager::ALLOW_ANY, OptionsCategory::GUI);
     argsman.AddArg(
         "-lang=<lang>",
         "Set language, for example \"de_DE\" (default: system locale)",
         ArgsManager::ALLOW_ANY, OptionsCategory::GUI);
     argsman.AddArg("-min", "Start minimized", ArgsManager::ALLOW_ANY,
                    OptionsCategory::GUI);
     argsman.AddArg(
         "-rootcertificates=<file>",
         "Set SSL root certificates for payment request (default: -system-)",
         ArgsManager::ALLOW_ANY, OptionsCategory::GUI);
     argsman.AddArg("-splash",
                    strprintf("Show splash screen on startup (default: %d)",
                              DEFAULT_SPLASHSCREEN),
                    ArgsManager::ALLOW_ANY, OptionsCategory::GUI);
     argsman.AddArg("-resetguisettings", "Reset all settings changed in the GUI",
                    ArgsManager::ALLOW_ANY, OptionsCategory::GUI);
     argsman.AddArg("-uiplatform",
                    strprintf("Select platform to customize UI for (one of "
                              "windows, macosx, other; default: %s)",
                              BitcoinGUI::DEFAULT_UIPLATFORM),
                    ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY,
                    OptionsCategory::GUI);
 }
 
 static void MigrateSettings() {
     assert(!QApplication::applicationName().isEmpty());
 
     static const QString legacyAppName("Bitcoin-Qt"),
 #ifdef Q_OS_DARWIN
         // Macs and/or iOS et al use a domain-style name for Settings
         // files. All other platforms use a simple orgname. This
         // difference is documented in the QSettings class documentation.
         legacyOrg("bitcoin.org");
 #else
         legacyOrg("Bitcoin");
 #endif
     QSettings
         // below picks up settings file location based on orgname,appname
         legacy(legacyOrg, legacyAppName),
         // default c'tor below picks up settings file location based on
         // QApplication::applicationName(), et al -- which was already set
         // in main()
         abc;
 #ifdef Q_OS_DARWIN
     // Disable bogus OSX keys from MacOS system-wide prefs that may cloud our
     // judgement ;) (this behavior is also documented in QSettings docs)
     legacy.setFallbacksEnabled(false);
     abc.setFallbacksEnabled(false);
 #endif
     const QStringList legacyKeys(legacy.allKeys());
 
     // We only migrate settings if we have Core settings but no Bitcoin-ABC
     // settings
     if (!legacyKeys.isEmpty() && abc.allKeys().isEmpty()) {
         for (const QString &key : legacyKeys) {
             // now, copy settings over
             abc.setValue(key, legacy.value(key));
         }
     }
 }
 
 int GuiMain(int argc, char *argv[]) {
 #ifdef WIN32
     util::WinCmdLineArgs winArgs;
     std::tie(argc, argv) = winArgs.get();
 #endif
     SetupEnvironment();
     util::ThreadSetInternalName("main");
 
     NodeContext node_context;
     std::unique_ptr<interfaces::Node> node =
         interfaces::MakeNode(&node_context);
 
     // Subscribe to global signals from core
     boost::signals2::scoped_connection handler_message_box =
         ::uiInterface.ThreadSafeMessageBox_connect(noui_ThreadSafeMessageBox);
     boost::signals2::scoped_connection handler_question =
         ::uiInterface.ThreadSafeQuestion_connect(noui_ThreadSafeQuestion);
     boost::signals2::scoped_connection handler_init_message =
         ::uiInterface.InitMessage_connect(noui_InitMessage);
 
     // Do not refer to data directory yet, this can be overridden by
     // Intro::pickDataDirectory
 
     /// 1. Basic Qt initialization (not dependent on parameters or
     /// configuration)
     Q_INIT_RESOURCE(bitcoin);
     Q_INIT_RESOURCE(bitcoin_locale);
 
     // Generate high-dpi pixmaps
     QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
     QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
 
     BitcoinApplication app;
 
     /// 2. Parse command-line options. We do this after qt in order to show an
     /// error if there are problems parsing these
     // Command-line options take precedence:
     SetupServerArgs(node_context);
     SetupUIArgs(gArgs);
     std::string error;
     if (!gArgs.ParseParameters(argc, argv, error)) {
         InitError(strprintf(
             Untranslated("Error parsing command line arguments: %s\n"), error));
         // Create a message box, because the gui has neither been created nor
         // has subscribed to core signals
         QMessageBox::critical(
             nullptr, PACKAGE_NAME,
             // message can not be translated because translations have not been
             // initialized
             QString::fromStdString("Error parsing command line arguments: %1.")
                 .arg(QString::fromStdString(error)));
         return EXIT_FAILURE;
     }
 
     // Now that the QApplication is setup and we have parsed our parameters, we
     // can set the platform style
     app.setupPlatformStyle();
 
     /// 3. Application identification
     // must be set before OptionsModel is initialized or translations are
     // loaded, as it is used to locate QSettings.
     // Note: If you move these calls somewhere else, be sure to bring
     // MigrateSettings() below along for the ride.
     QApplication::setOrganizationName(QAPP_ORG_NAME);
     QApplication::setOrganizationDomain(QAPP_ORG_DOMAIN);
     QApplication::setApplicationName(QAPP_APP_NAME_DEFAULT);
     // Migrate settings from core's/our old GUI settings to Bitcoin ABC
     // only if core's exist but Bitcoin ABC's doesn't.
     // NOTE -- this function needs to be called *after* the above 3 lines
     // that set the app orgname and app name! If you move the above 3 lines
     // to elsewhere, take this call with you!
     MigrateSettings();
 
     /// 4. Initialization of translations, so that intro dialog is in user's
     /// language. Now that QSettings are accessible, initialize translations.
     QTranslator qtTranslatorBase, qtTranslator, translatorBase, translator;
     initTranslations(qtTranslatorBase, qtTranslator, translatorBase,
                      translator);
 
     // Show help message immediately after parsing command-line options (for
     // "-lang") and setting locale, but before showing splash screen.
     if (HelpRequested(gArgs) || gArgs.IsArgSet("-version")) {
         HelpMessageDialog help(nullptr, gArgs.IsArgSet("-version"));
         help.showOrPrint();
         return EXIT_SUCCESS;
     }
 
     /// 5. Now that settings and translations are available, ask user for data
     /// directory. User language is set up: pick a data directory.
     bool did_show_intro = false;
     // Intro dialog prune check box
     bool prune = false;
     // Gracefully exit if the user cancels
     if (!Intro::showIfNeeded(did_show_intro, prune)) {
         return EXIT_SUCCESS;
     }
 
     /// 6. Determine availability of data directory and parse
     /// bitcoin.conf
     /// - Do not call GetDataDir(true) before this step finishes.
     if (!CheckDataDirOption()) {
         InitError(strprintf(
             Untranslated("Specified data directory \"%s\" does not exist.\n"),
             gArgs.GetArg("-datadir", "")));
         QMessageBox::critical(
             nullptr, PACKAGE_NAME,
             QObject::tr(
                 "Error: Specified data directory \"%1\" does not exist.")
                 .arg(QString::fromStdString(gArgs.GetArg("-datadir", ""))));
         return EXIT_FAILURE;
     }
     if (!gArgs.ReadConfigFiles(error)) {
         InitError(strprintf(
             Untranslated("Error reading configuration file: %s\n"), error));
         QMessageBox::critical(
             nullptr, PACKAGE_NAME,
             QObject::tr("Error: Cannot parse configuration file: %1.")
                 .arg(QString::fromStdString(error)));
         return EXIT_FAILURE;
     }
 
     /// 7. Determine network (and switch to network specific options)
     // - Do not call Params() before this step.
     // - Do this after parsing the configuration file, as the network can be
     // switched there.
     // - QSettings() will use the new application name after this, resulting in
     // network-specific settings.
     // - Needs to be done before createOptionsModel.
 
     // Check for -chain, -testnet or -regtest parameter (Params() calls are only
     // valid after this clause)
     try {
         SelectParams(gArgs.GetChainName());
     } catch (std::exception &e) {
         InitError(Untranslated(strprintf("%s\n", e.what())));
         QMessageBox::critical(nullptr, PACKAGE_NAME,
                               QObject::tr("Error: %1").arg(e.what()));
         return EXIT_FAILURE;
     }
 #ifdef ENABLE_WALLET
     // Parse URIs on command line -- this can affect Params()
     PaymentServer::ipcParseCommandLine(argc, argv);
 #endif
     if (!gArgs.InitSettings(error)) {
         InitError(Untranslated(error));
         QMessageBox::critical(nullptr, PACKAGE_NAME,
                               QObject::tr("Error initializing settings: %1")
                                   .arg(QString::fromStdString(error)));
         return EXIT_FAILURE;
     }
 
     QScopedPointer<const NetworkStyle> networkStyle(
         NetworkStyle::instantiate(Params().NetworkIDString()));
     assert(!networkStyle.isNull());
     // Allow for separate UI settings for testnets
     QApplication::setApplicationName(networkStyle->getAppName());
     // Re-initialize translations after changing application name (language in
     // network-specific settings can be different)
     initTranslations(qtTranslatorBase, qtTranslator, translatorBase,
                      translator);
 
 #ifdef ENABLE_WALLET
     /// 8. URI IPC sending
     // - Do this early as we don't want to bother initializing if we are just
     // calling IPC
     // - Do this *after* setting up the data directory, as the data directory
     // hash is used in the name
     // of the server.
     // - Do this after creating app and setting up translations, so errors are
     // translated properly.
     if (PaymentServer::ipcSendCommandLine()) {
         exit(EXIT_SUCCESS);
     }
 
     // Start up the payment server early, too, so impatient users that click on
     // bitcoincash: links repeatedly have their payment requests routed to this
     // process:
     if (WalletModel::isWalletEnabled()) {
         app.createPaymentServer();
     }
 #endif // ENABLE_WALLET
 
     /// 9. Main GUI initialization
     // Install global event filter that makes sure that long tooltips can be
     // word-wrapped.
     app.installEventFilter(
         new GUIUtil::ToolTipToRichTextFilter(TOOLTIP_WRAP_THRESHOLD, &app));
     // Install global event filter that makes sure that out-of-focus labels do
     // not contain text cursor.
     app.installEventFilter(new GUIUtil::LabelOutOfFocusEventFilter(&app));
 #if defined(Q_OS_WIN)
     // Install global event filter for processing Windows session related
     // Windows messages (WM_QUERYENDSESSION and WM_ENDSESSION)
     qApp->installNativeEventFilter(new WinShutdownMonitor());
 #endif
     // Install qDebug() message handler to route to debug.log
     qInstallMessageHandler(DebugMessageHandler);
     // Allow parameter interaction before we create the options model
     app.parameterSetup();
     GUIUtil::LogQtInfo();
     // Load GUI settings from QSettings
     app.createOptionsModel(gArgs.GetBoolArg("-resetguisettings", false));
 
     if (did_show_intro) {
         // Store intro dialog settings other than datadir (network specific)
         app.InitializePruneSetting(prune);
     }
 
     // Get global config
     Config &config = const_cast<Config &>(GetConfig());
 
     if (gArgs.GetBoolArg("-splash", DEFAULT_SPLASHSCREEN) &&
         !gArgs.GetBoolArg("-min", false)) {
         app.createSplashScreen(networkStyle.data());
     }
 
     app.setNode(*node);
 
     RPCServer rpcServer;
     util::Ref context{node_context};
     HTTPRPCRequestProcessor httpRPCRequestProcessor(config, rpcServer, context);
 
     try {
         app.createWindow(&config, networkStyle.data());
         // Perform base initialization before spinning up
         // initialization/shutdown thread. This is acceptable because this
         // function only contains steps that are quick to execute, so the GUI
         // thread won't be held up.
         if (!app.baseInitialize(config)) {
             // A dialog with detailed error will have been shown by InitError()
             return EXIT_FAILURE;
         }
         app.requestInitialize(config, rpcServer, httpRPCRequestProcessor);
 #if defined(Q_OS_WIN)
         WinShutdownMonitor::registerShutdownBlockReason(
             QObject::tr("%1 didn't yet exit safely...").arg(PACKAGE_NAME),
             (HWND)app.getMainWinId());
 #endif
         app.exec();
         app.requestShutdown(config);
         app.exec();
         return app.getReturnValue();
     } catch (const std::exception &e) {
         PrintExceptionContinue(&e, "Runaway exception");
         app.handleRunawayException(
             QString::fromStdString(app.node().getWarnings().translated));
     } catch (...) {
         PrintExceptionContinue(nullptr, "Runaway exception");
         app.handleRunawayException(
             QString::fromStdString(app.node().getWarnings().translated));
     }
     return EXIT_FAILURE;
 }
diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
index d442a30be..4bc924ceb 100644
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -1,1655 +1,1656 @@
 // Copyright (c) 2011-2019 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/bitcoingui.h>
 
 #include <chain.h>
 #include <chainparams.h>
 #include <config.h>
 #include <interfaces/handler.h>
 #include <interfaces/node.h>
 #include <node/ui_interface.h>
 #include <qt/bitcoinunits.h>
 #include <qt/clientmodel.h>
 #include <qt/createwalletdialog.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/optionsmodel.h>
 #include <qt/platformstyle.h>
 #include <qt/rpcconsole.h>
 #include <qt/utilitydialog.h>
 #ifdef ENABLE_WALLET
 #include <qt/walletcontroller.h>
 #include <qt/walletframe.h>
 #include <qt/walletmodel.h>
 #include <qt/walletview.h>
 #endif // ENABLE_WALLET
 #include <util/system.h>
 #include <util/translation.h>
 #include <validation.h>
 
 #include <memory>
 
 #include <QAction>
 #include <QApplication>
 #include <QComboBox>
 #include <QDateTime>
 #include <QDragEnterEvent>
 #include <QListWidget>
 #include <QMenu>
 #include <QMenuBar>
 #include <QMessageBox>
 #include <QMimeData>
 #include <QProgressDialog>
 #include <QScreen>
 #include <QSettings>
 #include <QShortcut>
 #include <QStackedWidget>
 #include <QStatusBar>
 #include <QStyle>
 #include <QSystemTrayIcon>
 #include <QTimer>
 #include <QToolBar>
 #include <QUrlQuery>
 #include <QVBoxLayout>
 #include <QWindow>
 
 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), m_node(node), trayIconMenu{new QMenu()},
       config(configIn), platformStyle(_platformStyle),
       m_network_style(networkStyle) {
     QSettings settings;
     if (!restoreGeometry(settings.value("MainWindowGeometry").toByteArray())) {
         // Restore failed (perhaps missing setting), center the window
         move(QGuiApplication::primaryScreen()->availableGeometry().center() -
              frameGeometry().center());
     }
 
 #ifdef ENABLE_WALLET
     enableWallet = WalletModel::isWalletEnabled();
 #endif // ENABLE_WALLET
     QApplication::setWindowIcon(m_network_style->getTrayAndWindowIcon());
     setWindowIcon(m_network_style->getTrayAndWindowIcon());
     updateWindowTitle();
 
     rpcConsole = new RPCConsole(node, _platformStyle, nullptr);
     helpMessageDialog = new HelpMessageDialog(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);
         Q_EMIT consoleShown(rpcConsole);
     }
 
     modalOverlay = new ModalOverlay(enableWallet, this->centralWidget());
 
     // 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
     if (QSystemTrayIcon::isSystemTrayAvailable()) {
         createTrayIcon();
     }
     notificator =
         new Notificator(QApplication::applicationName(), trayIcon, this);
 
     // 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();
     labelProxyIcon = new GUIUtil::ClickableLabel();
     connectionsControl = new GUIUtil::ClickableLabel();
     labelBlocksIcon = new GUIUtil::ClickableLabel();
     if (enableWallet) {
         frameBlocksLayout->addStretch();
         frameBlocksLayout->addWidget(unitDisplayControl);
         frameBlocksLayout->addStretch();
         frameBlocksLayout->addWidget(labelWalletEncryptionIcon);
         frameBlocksLayout->addWidget(labelWalletHDStatusIcon);
     }
     frameBlocksLayout->addWidget(labelProxyIcon);
     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, &GUIUtil::ClickableLabel::clicked,
             [this] { m_node.setNetworkActive(!m_node.getNetworkActive()); });
     connect(labelProxyIcon, &GUIUtil::ClickableLabel::clicked,
             [this] { openOptionsDialogWithTab(OptionsDialog::TAB_NETWORK); });
 
     connect(labelBlocksIcon, &GUIUtil::ClickableLabel::clicked, this,
             &BitcoinGUI::showModalOverlay);
     connect(progressBar, &GUIUtil::ClickableProgressBar::clicked, this,
             &BitcoinGUI::showModalOverlay);
 #ifdef ENABLE_WALLET
     if (enableWallet) {
         connect(walletFrame, &WalletFrame::requestedSyncWarningInfo, this,
                 &BitcoinGUI::showModalOverlay);
     }
 #endif
 
 #ifdef Q_OS_MAC
     m_app_nap_inhibitor = new CAppNapInhibitor;
 #endif
 
     GUIUtil::handleCloseWindowShortcut(this);
 }
 
 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 m_app_nap_inhibitor;
     delete appMenuBar;
     MacDockIconHandler::cleanup();
 #endif
 
     delete rpcConsole;
 }
 
 void BitcoinGUI::createActions() {
     QActionGroup *tabGroup = new QActionGroup(this);
     connect(modalOverlay, &ModalOverlay::triggered, tabGroup,
             &QActionGroup::setEnabled);
 
     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(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(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, &QAction::triggered,
             [this] { showNormalIfMinimized(); });
     connect(overviewAction, &QAction::triggered, this,
             &BitcoinGUI::gotoOverviewPage);
     connect(sendCoinsAction, &QAction::triggered,
             [this] { showNormalIfMinimized(); });
     connect(sendCoinsAction, &QAction::triggered,
             [this] { gotoSendCoinsPage(); });
     connect(sendCoinsMenuAction, &QAction::triggered,
             [this] { showNormalIfMinimized(); });
     connect(sendCoinsMenuAction, &QAction::triggered,
             [this] { gotoSendCoinsPage(); });
     connect(receiveCoinsAction, &QAction::triggered,
             [this] { showNormalIfMinimized(); });
     connect(receiveCoinsAction, &QAction::triggered, this,
             &BitcoinGUI::gotoReceiveCoinsPage);
     connect(receiveCoinsMenuAction, &QAction::triggered,
             [this] { showNormalIfMinimized(); });
     connect(receiveCoinsMenuAction, &QAction::triggered, this,
             &BitcoinGUI::gotoReceiveCoinsPage);
     connect(historyAction, &QAction::triggered,
             [this] { showNormalIfMinimized(); });
     connect(historyAction, &QAction::triggered, this,
             &BitcoinGUI::gotoHistoryPage);
 #endif // ENABLE_WALLET
 
     quitAction = new QAction(tr("E&xit"), this);
     quitAction->setStatusTip(tr("Quit application"));
     quitAction->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_Q));
     quitAction->setMenuRole(QAction::QuitRole);
     aboutAction = new QAction(tr("&About %1").arg(PACKAGE_NAME), this);
     aboutAction->setStatusTip(
         tr("Show information about %1").arg(PACKAGE_NAME));
     aboutAction->setMenuRole(QAction::AboutRole);
     aboutAction->setEnabled(false);
     aboutQtAction = new QAction(tr("About &Qt"), this);
     aboutQtAction->setStatusTip(tr("Show information about Qt"));
     aboutQtAction->setMenuRole(QAction::AboutQtRole);
     optionsAction = new QAction(tr("&Options..."), this);
     optionsAction->setStatusTip(
         tr("Modify configuration options for %1").arg(PACKAGE_NAME));
     optionsAction->setMenuRole(QAction::PreferencesRole);
     optionsAction->setEnabled(false);
     toggleHideAction = new QAction(tr("&Show / Hide"), this);
     toggleHideAction->setStatusTip(tr("Show or hide the main Window"));
 
     encryptWalletAction = new QAction(tr("&Encrypt Wallet..."), this);
     encryptWalletAction->setStatusTip(
         tr("Encrypt the private keys that belong to your wallet"));
     encryptWalletAction->setCheckable(true);
     backupWalletAction = new QAction(tr("&Backup Wallet..."), this);
     backupWalletAction->setStatusTip(tr("Backup wallet to another location"));
     changePassphraseAction = new QAction(tr("&Change Passphrase..."), this);
     changePassphraseAction->setStatusTip(
         tr("Change the passphrase used for wallet encryption"));
     signMessageAction = new QAction(tr("Sign &message..."), this);
     signMessageAction->setStatusTip(
         tr("Sign messages with your Bitcoin addresses to prove you own them"));
     verifyMessageAction = new QAction(tr("&Verify message..."), this);
     verifyMessageAction->setStatusTip(
         tr("Verify messages to ensure they were signed with specified Bitcoin "
            "addresses"));
     m_load_psbt_action = new QAction(tr("Load PSBT..."), this);
     m_load_psbt_action->setStatusTip(
         tr("Load Partially Signed Bitcoin Transaction"));
 
     openRPCConsoleAction = new QAction(tr("&Debug window"), this);
     openRPCConsoleAction->setStatusTip(
         tr("Open node debugging and diagnostic console"));
     // initially disable the debug window menu item
     openRPCConsoleAction->setEnabled(false);
     openRPCConsoleAction->setObjectName("openRPCConsoleAction");
 
     usedSendingAddressesAction = new QAction(tr("&Sending addresses"), this);
     usedSendingAddressesAction->setStatusTip(
         tr("Show the list of used sending addresses and labels"));
     usedReceivingAddressesAction =
         new QAction(tr("&Receiving addresses"), this);
     usedReceivingAddressesAction->setStatusTip(
         tr("Show the list of used receiving addresses and labels"));
 
     openAction = new QAction(tr("Open &URI..."), this);
     openAction->setStatusTip(
         tr("Open a %1: URI or payment request")
             .arg(QString::fromStdString(
                 config->GetChainParams().CashAddrPrefix())));
 
     m_open_wallet_action = new QAction(tr("Open Wallet"), this);
     m_open_wallet_action->setEnabled(false);
     m_open_wallet_action->setStatusTip(tr("Open a wallet"));
     m_open_wallet_menu = new QMenu(this);
 
     m_close_wallet_action = new QAction(tr("Close Wallet..."), this);
     m_close_wallet_action->setStatusTip(tr("Close wallet"));
 
     m_create_wallet_action = new QAction(tr("Create Wallet..."), this);
     m_create_wallet_action->setEnabled(false);
     m_create_wallet_action->setStatusTip(tr("Create a new wallet"));
 
     m_close_all_wallets_action = new QAction(tr("Close All Wallets..."), this);
     m_close_all_wallets_action->setStatusTip(tr("Close all wallets"));
 
     showHelpMessageAction = new QAction(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(PACKAGE_NAME));
 
     m_mask_values_action = new QAction(tr("&Mask values"), this);
     m_mask_values_action->setShortcut(
         QKeySequence(Qt::CTRL + Qt::SHIFT + Qt::Key_M));
     m_mask_values_action->setStatusTip(
         tr("Mask the values in the Overview tab"));
     m_mask_values_action->setCheckable(true);
 
     connect(quitAction, &QAction::triggered, qApp, QApplication::quit);
     connect(aboutAction, &QAction::triggered, this, &BitcoinGUI::aboutClicked);
     connect(aboutQtAction, &QAction::triggered, qApp, QApplication::aboutQt);
     connect(optionsAction, &QAction::triggered, this,
             &BitcoinGUI::optionsClicked);
     connect(toggleHideAction, &QAction::triggered, this,
             &BitcoinGUI::toggleHidden);
     connect(showHelpMessageAction, &QAction::triggered, this,
             &BitcoinGUI::showHelpMessageClicked);
     connect(openRPCConsoleAction, &QAction::triggered, this,
             &BitcoinGUI::showDebugWindow);
     // prevents an open debug window from becoming stuck/unusable on client
     // shutdown
     connect(quitAction, &QAction::triggered, rpcConsole, &QWidget::hide);
 
 #ifdef ENABLE_WALLET
     if (walletFrame) {
         connect(encryptWalletAction, &QAction::triggered, walletFrame,
                 &WalletFrame::encryptWallet);
         connect(backupWalletAction, &QAction::triggered, walletFrame,
                 &WalletFrame::backupWallet);
         connect(changePassphraseAction, &QAction::triggered, walletFrame,
                 &WalletFrame::changePassphrase);
         connect(signMessageAction, &QAction::triggered,
                 [this] { showNormalIfMinimized(); });
         connect(signMessageAction, &QAction::triggered,
                 [this] { gotoSignMessageTab(); });
         connect(verifyMessageAction, &QAction::triggered,
                 [this] { showNormalIfMinimized(); });
         connect(verifyMessageAction, &QAction::triggered,
                 [this] { gotoVerifyMessageTab(); });
         connect(m_load_psbt_action, &QAction::triggered,
                 [this] { gotoLoadPSBT(); });
         connect(usedSendingAddressesAction, &QAction::triggered, walletFrame,
                 &WalletFrame::usedSendingAddresses);
         connect(usedReceivingAddressesAction, &QAction::triggered, walletFrame,
                 &WalletFrame::usedReceivingAddresses);
         connect(openAction, &QAction::triggered, this,
                 &BitcoinGUI::openClicked);
         connect(m_open_wallet_menu, &QMenu::aboutToShow, [this] {
             m_open_wallet_menu->clear();
             for (const std::pair<const std::string, bool> &i :
                  m_wallet_controller->listWalletDir()) {
                 const std::string &path = i.first;
                 QString name = path.empty()
                                    ? QString("[" + tr("default wallet") + "]")
                                    : QString::fromStdString(path);
                 // Menu items remove single &. Single & are shown when && is in
                 // the string, but only the first occurrence. So replace only
                 // the first & with &&
                 name.replace(name.indexOf(QChar('&')), 1, QString("&&"));
                 QAction *action = m_open_wallet_menu->addAction(name);
 
                 if (i.second) {
                     // This wallet is already loaded
                     action->setEnabled(false);
                     continue;
                 }
 
                 connect(action, &QAction::triggered, [this, path] {
                     auto activity =
                         new OpenWalletActivity(m_wallet_controller, this,
                                                this->config->GetChainParams());
                     connect(activity, &OpenWalletActivity::opened, this,
                             &BitcoinGUI::setCurrentWallet);
                     connect(activity, &OpenWalletActivity::finished, activity,
                             &QObject::deleteLater);
                     activity->open(path);
                 });
             }
             if (m_open_wallet_menu->isEmpty()) {
                 QAction *action =
                     m_open_wallet_menu->addAction(tr("No wallets available"));
                 action->setEnabled(false);
             }
         });
         connect(m_close_wallet_action, &QAction::triggered, [this] {
             m_wallet_controller->closeWallet(walletFrame->currentWalletModel(),
                                              this);
         });
         connect(m_create_wallet_action, &QAction::triggered, [this] {
             auto activity = new CreateWalletActivity(
                 m_wallet_controller, this, this->config->GetChainParams());
             connect(activity, &CreateWalletActivity::created, this,
                     &BitcoinGUI::setCurrentWallet);
             connect(activity, &CreateWalletActivity::finished, activity,
                     &QObject::deleteLater);
             activity->create();
         });
         connect(m_close_all_wallets_action, &QAction::triggered,
                 [this] { m_wallet_controller->closeAllWallets(this); });
         connect(m_mask_values_action, &QAction::toggled, this,
                 &BitcoinGUI::setPrivacy);
     }
 #endif // ENABLE_WALLET
 
     connect(new QShortcut(QKeySequence(Qt::CTRL + Qt::SHIFT + Qt::Key_C), this),
             &QShortcut::activated, this,
             &BitcoinGUI::showDebugWindowActivateConsole);
     connect(new QShortcut(QKeySequence(Qt::CTRL + Qt::SHIFT + Qt::Key_D), this),
             &QShortcut::activated, this, &BitcoinGUI::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(m_create_wallet_action);
         file->addAction(m_open_wallet_action);
         file->addAction(m_close_wallet_action);
         file->addAction(m_close_all_wallets_action);
         file->addSeparator();
         file->addAction(openAction);
         file->addAction(backupWalletAction);
         file->addAction(signMessageAction);
         file->addAction(verifyMessageAction);
         file->addAction(m_load_psbt_action);
         file->addSeparator();
     }
     file->addAction(quitAction);
 
     QMenu *settings = appMenuBar->addMenu(tr("&Settings"));
     if (walletFrame) {
         settings->addAction(encryptWalletAction);
         settings->addAction(changePassphraseAction);
         settings->addSeparator();
         settings->addAction(m_mask_values_action);
         settings->addSeparator();
     }
     settings->addAction(optionsAction);
 
     QMenu *window_menu = appMenuBar->addMenu(tr("&Window"));
 
     QAction *minimize_action = window_menu->addAction(tr("Minimize"));
     minimize_action->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_M));
     connect(minimize_action, &QAction::triggered,
             [] { QApplication::activeWindow()->showMinimized(); });
     connect(qApp, &QApplication::focusWindowChanged,
             [minimize_action](QWindow *window) {
                 minimize_action->setEnabled(
                     window != nullptr &&
                     (window->flags() & Qt::Dialog) != Qt::Dialog &&
                     window->windowState() != Qt::WindowMinimized);
             });
 
 #ifdef Q_OS_MAC
     QAction *zoom_action = window_menu->addAction(tr("Zoom"));
     connect(zoom_action, &QAction::triggered, [] {
         QWindow *window = qApp->focusWindow();
         if (window->windowState() != Qt::WindowMaximized) {
             window->showMaximized();
         } else {
             window->showNormal();
         }
     });
 
     connect(qApp, &QApplication::focusWindowChanged,
             [zoom_action](QWindow *window) {
                 zoom_action->setEnabled(window != nullptr);
             });
 #endif
 
     if (walletFrame) {
 #ifdef Q_OS_MAC
         window_menu->addSeparator();
         QAction *main_window_action = window_menu->addAction(tr("Main Window"));
         connect(main_window_action, &QAction::triggered,
                 [this] { GUIUtil::bringToFront(this); });
 #endif
         window_menu->addSeparator();
         window_menu->addAction(usedSendingAddressesAction);
         window_menu->addAction(usedReceivingAddressesAction);
     }
 
     window_menu->addSeparator();
     for (RPCConsole::TabTypes tab_type : rpcConsole->tabs()) {
         QAction *tab_action =
             window_menu->addAction(rpcConsole->tabTitle(tab_type));
         tab_action->setShortcut(rpcConsole->tabShortcut(tab_type));
         connect(tab_action, &QAction::triggered, [this, tab_type] {
             rpcConsole->setTabFocus(tab_type);
             showDebugWindow();
         });
     }
 
     QMenu *help = appMenuBar->addMenu(tr("&Help"));
     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();
         m_wallet_selector->setSizeAdjustPolicy(QComboBox::AdjustToContents);
         connect(m_wallet_selector,
                 static_cast<void (QComboBox::*)(int)>(
                     &QComboBox::currentIndexChanged),
                 this, &BitcoinGUI::setCurrentWalletBySelectorIndex);
 
         m_wallet_selector_label = new QLabel();
         m_wallet_selector_label->setText(tr("Wallet:") + " ");
         m_wallet_selector_label->setBuddy(m_wallet_selector);
 
         m_wallet_selector_label_action =
             appToolBar->addWidget(m_wallet_selector_label);
         m_wallet_selector_action = appToolBar->addWidget(m_wallet_selector);
 
         m_wallet_selector_label_action->setVisible(false);
         m_wallet_selector_action->setVisible(false);
 #endif
     }
 }
 
 void BitcoinGUI::setClientModel(ClientModel *_clientModel,
                                 interfaces::BlockAndHeaderTipInfo *tip_info) {
     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, &ClientModel::numConnectionsChanged, this,
                 &BitcoinGUI::setNumConnections);
         connect(_clientModel, &ClientModel::networkActiveChanged, this,
                 &BitcoinGUI::setNetworkActive);
 
         modalOverlay->setKnownBestHeight(
             tip_info->header_height,
             QDateTime::fromTime_t(tip_info->header_time));
         setNumBlocks(tip_info->block_height,
                      QDateTime::fromTime_t(tip_info->block_time),
                      tip_info->verification_progress, false,
                      SynchronizationState::INIT_DOWNLOAD);
         connect(_clientModel, &ClientModel::numBlocksChanged, this,
                 &BitcoinGUI::setNumBlocks);
 
         // Receive and report messages from client model
         connect(_clientModel, &ClientModel::message,
                 [this](const QString &title, const QString &message,
                        unsigned int style) {
                     this->message(title, message, style);
                 });
 
         // Show progress dialog
         connect(_clientModel, &ClientModel::showProgress, this,
                 &BitcoinGUI::showProgress);
 
         rpcConsole->setClientModel(_clientModel, tip_info->block_height,
                                    tip_info->block_time,
                                    tip_info->verification_progress);
 
         updateProxyIcon();
 
 #ifdef ENABLE_WALLET
         if (walletFrame) {
             walletFrame->setClientModel(_clientModel);
         }
 #endif // ENABLE_WALLET
         unitDisplayControl->setOptionsModel(_clientModel->getOptionsModel());
 
         OptionsModel *optionsModel = _clientModel->getOptionsModel();
         if (optionsModel && trayIcon) {
             // be aware of the tray icon disable state change reported by the
             // OptionsModel object.
             connect(optionsModel, &OptionsModel::hideTrayIconChanged, this,
                     &BitcoinGUI::setTrayIconVisible);
 
             // 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
 void BitcoinGUI::setWalletController(WalletController *wallet_controller) {
     assert(!m_wallet_controller);
     assert(wallet_controller);
 
     m_wallet_controller = wallet_controller;
 
     m_create_wallet_action->setEnabled(true);
     m_open_wallet_action->setEnabled(true);
     m_open_wallet_action->setMenu(m_open_wallet_menu);
 
     connect(wallet_controller, &WalletController::walletAdded, this,
             &BitcoinGUI::addWallet);
     connect(wallet_controller, &WalletController::walletRemoved, this,
             &BitcoinGUI::removeWallet);
 
     for (WalletModel *wallet_model : m_wallet_controller->getOpenWallets()) {
         addWallet(wallet_model);
     }
 }
 
 void BitcoinGUI::addWallet(WalletModel *walletModel) {
     if (!walletFrame) {
         return;
     }
     if (!walletFrame->addWallet(walletModel)) {
         return;
     }
     const QString display_name = walletModel->getDisplayName();
     setWalletActionsEnabled(true);
     rpcConsole->addWallet(walletModel);
     m_wallet_selector->addItem(display_name, QVariant::fromValue(walletModel));
     if (m_wallet_selector->count() == 2) {
         m_wallet_selector_label_action->setVisible(true);
         m_wallet_selector_action->setVisible(true);
     }
 }
 
 void BitcoinGUI::removeWallet(WalletModel *walletModel) {
     if (!walletFrame) {
         return;
     }
 
     labelWalletHDStatusIcon->hide();
     labelWalletEncryptionIcon->hide();
 
     int index = m_wallet_selector->findData(QVariant::fromValue(walletModel));
     m_wallet_selector->removeItem(index);
     if (m_wallet_selector->count() == 0) {
         setWalletActionsEnabled(false);
         overviewAction->setChecked(true);
     } else if (m_wallet_selector->count() == 1) {
         m_wallet_selector_label_action->setVisible(false);
         m_wallet_selector_action->setVisible(false);
     }
     rpcConsole->removeWallet(walletModel);
     walletFrame->removeWallet(walletModel);
     updateWindowTitle();
 }
 
 void BitcoinGUI::setCurrentWallet(WalletModel *wallet_model) {
     if (!walletFrame) {
         return;
     }
     walletFrame->setCurrentWallet(wallet_model);
     for (int index = 0; index < m_wallet_selector->count(); ++index) {
         if (m_wallet_selector->itemData(index).value<WalletModel *>() ==
             wallet_model) {
             m_wallet_selector->setCurrentIndex(index);
             break;
         }
     }
     updateWindowTitle();
 }
 
 void BitcoinGUI::setCurrentWalletBySelectorIndex(int index) {
     WalletModel *wallet_model =
         m_wallet_selector->itemData(index).value<WalletModel *>();
     if (wallet_model) {
         setCurrentWallet(wallet_model);
     }
 }
 
 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);
     m_close_wallet_action->setEnabled(enabled);
     m_close_all_wallets_action->setEnabled(enabled);
 }
 
 void BitcoinGUI::createTrayIcon() {
     assert(QSystemTrayIcon::isSystemTrayAvailable());
 
 #ifndef Q_OS_MAC
     if (QSystemTrayIcon::isSystemTrayAvailable()) {
         trayIcon =
             new QSystemTrayIcon(m_network_style->getTrayAndWindowIcon(), this);
         QString toolTip = tr("%1 client").arg(PACKAGE_NAME) + " " +
                           m_network_style->getTitleAddText();
         trayIcon->setToolTip(toolTip);
     }
 #endif
 }
 
 void BitcoinGUI::createTrayIconMenu() {
 #ifndef Q_OS_MAC
     // Return if trayIcon is unset (only on non-macOSes)
     if (!trayIcon) {
         return;
     }
 
     trayIcon->setContextMenu(trayIconMenu.get());
     connect(trayIcon, &QSystemTrayIcon::activated, this,
             &BitcoinGUI::trayIconActivated);
 #else
     // Note: On macOS, the Dock icon is used to provide the tray's
     // functionality.
     MacDockIconHandler *dockIconHandler = MacDockIconHandler::instance();
     connect(dockIconHandler, &MacDockIconHandler::dockIconClicked, this,
             &BitcoinGUI::macosDockIconActivated);
     trayIconMenu->setAsDockMenu();
 #endif
 
     // Configuration of the tray icon (or Dock icon) menu
 #ifndef Q_OS_MAC
     // Note: On macOS, the Dock icon's menu already has Show / Hide action.
     trayIconMenu->addAction(toggleHideAction);
     trayIconMenu->addSeparator();
 #endif
     if (enableWallet) {
         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 macOS
     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();
     }
 }
 #else
 void BitcoinGUI::macosDockIconActivated() {
     show();
     activateWindow();
 }
 #endif
 
 void BitcoinGUI::optionsClicked() {
     openOptionsDialogWithTab(OptionsDialog::TAB_MAIN);
 }
 
 void BitcoinGUI::aboutClicked() {
     if (!clientModel) {
         return;
     }
 
     HelpMessageDialog dlg(this, true);
     dlg.exec();
 }
 
 void BitcoinGUI::showDebugWindow() {
     GUIUtil::bringToFront(rpcConsole);
     Q_EMIT consoleShown(rpcConsole);
 }
 
 void BitcoinGUI::showDebugWindowActivateConsole() {
     rpcConsole->setTabFocus(RPCConsole::TabTypes::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);
     }
 }
 void BitcoinGUI::gotoLoadPSBT() {
     if (walletFrame) {
         walletFrame->gotoLoadPSBT();
     }
 }
 #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::openOptionsDialogWithTab(OptionsDialog::Tab tab) {
     if (!clientModel || !clientModel->getOptionsModel()) {
         return;
     }
 
     OptionsDialog dlg(this, enableWallet);
     dlg.setCurrentTab(tab);
     dlg.setModel(clientModel->getOptionsModel());
     dlg.exec();
 }
 
 void BitcoinGUI::setNumBlocks(int count, const QDateTime &blockDate,
                               double nVerificationProgress, bool header,
                               SynchronizationState sync_state) {
 // Disabling macOS App Nap on initial sync, disk and reindex operations.
 #ifdef Q_OS_MAC
     if (sync_state == SynchronizationState::POST_INIT) {
         m_app_nap_inhibitor->enableAppNap();
     } else {
         m_app_nap_inhibitor->disableAppNap();
     }
 #endif
 
     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(":/animation/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, QString message,
                          unsigned int style, bool *ret,
                          const QString &detailed_message) {
     // Default title. On macOS, the window title is ignored (as required by the
     // macOS Guidelines).
     QString strTitle{PACKAGE_NAME};
     // Default to information icon
     int nMBoxIcon = QMessageBox::Information;
     int nNotifyIcon = Notificator::Information;
 
     QString msgType;
     if (!title.isEmpty()) {
         msgType = title;
     } else {
         switch (style) {
             case CClientUIInterface::MSG_ERROR:
                 msgType = tr("Error");
                 message = tr("Error: %1").arg(message);
                 break;
             case CClientUIInterface::MSG_WARNING:
                 msgType = tr("Warning");
                 message = tr("Warning: %1").arg(message);
                 break;
             case CClientUIInterface::MSG_INFORMATION:
                 msgType = tr("Information");
                 // No need to prepend the prefix here.
                 break;
             default:
                 break;
         }
     }
 
     if (!msgType.isEmpty()) {
         strTitle += " - " + msgType;
     }
 
     if (style & CClientUIInterface::ICON_ERROR) {
         nMBoxIcon = QMessageBox::Critical;
         nNotifyIcon = Notificator::Critical;
     } else if (style & CClientUIInterface::ICON_WARNING) {
         nMBoxIcon = QMessageBox::Warning;
         nNotifyIcon = Notificator::Warning;
     }
 
     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);
         mBox.setTextFormat(Qt::PlainText);
         mBox.setDetailedText(detailed_message);
         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, &BitcoinGUI::hide);
                 e->ignore();
             } else if ((wsevt->oldState() & Qt::WindowMinimized) &&
                        !isMinimized()) {
                 QTimer::singleShot(0, this, &BitcoinGUI::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()) {
+    if (m_node.walletClient().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(bool privkeyDisabled, int hdEnabled) {
     labelWalletHDStatusIcon->setPixmap(
         platformStyle
             ->SingleColorIcon(privkeyDisabled
                                   ? ":/icons/eye"
                                   : hdEnabled ? ":/icons/hd_enabled"
                                               : ":/icons/hd_disabled")
             .pixmap(STATUSBAR_ICONSIZE, STATUSBAR_ICONSIZE));
     labelWalletHDStatusIcon->setToolTip(
         privkeyDisabled
             ? tr("Private key <b>disabled</b>")
             : hdEnabled ? tr("HD key generation is <b>enabled</b>")
                         : tr("HD key generation is <b>disabled</b>"));
     labelWalletHDStatusIcon->show();
     // 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);
             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);
             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().privateKeysDisabled(),
                 walletModel->wallet().hdEnabled());
 }
 #endif // ENABLE_WALLET
 
 void BitcoinGUI::updateProxyIcon() {
     std::string ip_port;
     bool proxy_enabled = clientModel->getProxyInfo(ip_port);
 
     if (proxy_enabled) {
         if (!labelProxyIcon->hasPixmap()) {
             QString ip_port_q = QString::fromStdString(ip_port);
             labelProxyIcon->setPixmap(
                 platformStyle->SingleColorIcon(":/icons/proxy")
                     .pixmap(STATUSBAR_ICONSIZE, STATUSBAR_ICONSIZE));
             labelProxyIcon->setToolTip(
                 tr("Proxy is <b>enabled</b>: %1").arg(ip_port_q));
         } else {
             labelProxyIcon->show();
         }
     } else {
         labelProxyIcon->hide();
     }
 }
 
 void BitcoinGUI::updateWindowTitle() {
     QString window_title = PACKAGE_NAME;
 #ifdef ENABLE_WALLET
     if (walletFrame) {
         WalletModel *const wallet_model = walletFrame->currentWalletModel();
         if (wallet_model && !wallet_model->getWalletName().isEmpty()) {
             window_title += " - " + wallet_model->getDisplayName();
         }
     }
 #endif
     if (!m_network_style->getTitleAddText().isEmpty()) {
         window_title += " - " + m_network_style->getTitleAddText();
     }
     setWindowTitle(window_title);
 }
 
 void BitcoinGUI::showNormalIfMinimized(bool fToggleHidden) {
     if (!clientModel) {
         return;
     }
 
     if (!isHidden() && !isMinimized() && !GUIUtil::isObscured(this) &&
         fToggleHidden) {
         hide();
     } else {
         GUIUtil::bringToFront(this);
     }
 }
 
 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, QString(), 0, 100);
         GUIUtil::PolishProgressDialog(progressDialog);
         progressDialog->setWindowModality(Qt::ApplicationModal);
         progressDialog->setMinimumDuration(0);
         progressDialog->setAutoClose(false);
         progressDialog->setValue(0);
     } else if (nProgress == 100) {
         if (progressDialog) {
             progressDialog->close();
             progressDialog->deleteLater();
             progressDialog = nullptr;
         }
     } else if (progressDialog) {
         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 bilingual_str &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;
     // This is original message, in English, for googling and referencing.
     QString detailed_message;
     if (message.original != message.translated) {
         detailed_message = BitcoinGUI::tr("Original message:") + "\n" +
                            QString::fromStdString(message.original);
     }
 
     // In case of modal message, use blocking connection to wait for user to
     // click a button
     bool invoked = QMetaObject::invokeMethod(
         gui, "message",
         modal ? GUIUtil::blockingGUIThreadConnection() : Qt::QueuedConnection,
         Q_ARG(QString, QString::fromStdString(caption)),
         Q_ARG(QString, QString::fromStdString(message.translated)),
         Q_ARG(unsigned int, style), Q_ARG(bool *, &ret),
         Q_ARG(QString, detailed_message));
     assert(invoked);
     return ret;
 }
 
 void BitcoinGUI::subscribeToCoreSignals() {
     // Connect signals to client
     m_handler_message_box = m_node.handleMessageBox(
         std::bind(ThreadSafeMessageBox, this, std::placeholders::_1,
                   std::placeholders::_2, std::placeholders::_3));
     m_handler_question = m_node.handleQuestion(
         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();
 }
 
 bool BitcoinGUI::isPrivacyModeActivated() const {
     assert(m_mask_values_action);
     return m_mask_values_action->isChecked();
 }
 
 UnitDisplayStatusBarControl::UnitDisplayStatusBarControl(
     const PlatformStyle *platformStyle)
     : optionsModel(nullptr), menu(nullptr) {
     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,
                          GUIUtil::TextWidth(fm, BitcoinUnits::longName(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 (const BitcoinUnits::Unit u : BitcoinUnits::availableUnits()) {
         QAction *menuAction =
             new QAction(QString(BitcoinUnits::longName(u)), this);
         menuAction->setData(QVariant(u));
         menu->addAction(menuAction);
     }
     connect(menu, &QMenu::triggered, this,
             &UnitDisplayStatusBarControl::onMenuSelection);
 }
 
 /** 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, &OptionsModel::displayUnitChanged, this,
                 &UnitDisplayStatusBarControl::updateDisplayUnit);
 
         // 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::longName(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/splashscreen.cpp b/src/qt/splashscreen.cpp
index b616fa8f5..f8ad205fe 100644
--- a/src/qt/splashscreen.cpp
+++ b/src/qt/splashscreen.cpp
@@ -1,264 +1,271 @@
 // 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 <clientversion.h>
 #include <interfaces/handler.h>
 #include <interfaces/node.h>
 #include <interfaces/wallet.h>
 #include <qt/guiutil.h>
 #include <qt/networkstyle.h>
+#include <qt/walletmodel.h>
 #include <util/system.h>
 #include <util/translation.h>
 
 #include <QApplication>
 #include <QCloseEvent>
 #include <QPainter>
 #include <QRadialGradient>
 #include <QScreen>
 
 SplashScreen::SplashScreen(const NetworkStyle *networkStyle)
     : QWidget(nullptr), curAlignment(0) {
     // set reference point, paddings
     int paddingRight = 50;
     int paddingTop = 50;
     int titleVersionVSpace = 17;
     int titleCopyrightVSpace = 40;
 
     float fontFactor = 1.0;
     float devicePixelRatio = 1.0;
     devicePixelRatio =
         static_cast<QGuiApplication *>(QCoreApplication::instance())
             ->devicePixelRatio();
 
     // define text to place
     QString titleText = 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);
 
     // change to HiDPI if it makes sense
     pixmap.setDevicePixelRatio(devicePixelRatio);
 
     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 = GUIUtil::TextWidth(fm, titleText);
     if (titleTextWidth > 176) {
         fontFactor = fontFactor * 176 / titleTextWidth;
     }
 
     pixPaint.setFont(QFont(font, 33 * fontFactor));
     fm = pixPaint.fontMetrics();
     titleTextWidth = GUIUtil::TextWidth(fm, titleText);
     pixPaint.drawText(pixmap.width() / devicePixelRatio - titleTextWidth -
                           paddingRight,
                       paddingTop, titleText);
 
     pixPaint.setFont(QFont(font, 15 * fontFactor));
 
     // if the version string is too long, reduce size
     fm = pixPaint.fontMetrics();
     int versionTextWidth = GUIUtil::TextWidth(fm, titleText);
     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 = GUIUtil::TextWidth(fm, 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(QGuiApplication::primaryScreen()->geometry().center() - r.center());
 
     installEventFilter(this);
 
     GUIUtil::handleCloseWindowShortcut(this);
 }
 
 SplashScreen::~SplashScreen() {
     if (m_node) {
         unsubscribeFromCoreSignals();
     }
 }
 
 void SplashScreen::setNode(interfaces::Node &node) {
     assert(!m_node);
     m_node = &node;
     subscribeToCoreSignals();
     if (m_shutdown) {
         m_node->startShutdown();
     }
 }
 
 void SplashScreen::shutdown() {
     m_shutdown = true;
     if (m_node) {
         m_node->startShutdown();
     }
 }
 
 bool SplashScreen::eventFilter(QObject *obj, QEvent *ev) {
     if (ev->type() == QEvent::KeyPress) {
         QKeyEvent *keyEvent = static_cast<QKeyEvent *>(ev);
         if (keyEvent->key() == Qt::Key_Q) {
             shutdown();
         }
     }
     return QObject::eventFilter(obj, ev);
 }
 
 void SplashScreen::finish() {
     /* If the window is minimized, hide() will be ignored. */
     /* Make sure we de-minimize the splashscreen window before hiding */
     if (isMinimized()) {
         showNormal();
     }
     hide();
     // No more need for this
     deleteLater();
 }
 
 static void InitMessage(SplashScreen *splash, const std::string &message) {
     bool invoked = 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)));
     assert(invoked);
 }
 
 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)").translated
                  : _("press q to shutdown").translated) +
             strprintf("\n%d", nProgress) + "%");
 }
 #ifdef ENABLE_WALLET
 void SplashScreen::ConnectWallet(std::unique_ptr<interfaces::Wallet> wallet) {
     m_connected_wallet_handlers.emplace_back(wallet->handleShowProgress(
         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(
         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));
+}
+
+void SplashScreen::handleLoadWallet() {
 #ifdef ENABLE_WALLET
-    m_handler_load_wallet = m_node->handleLoadWallet(
+    if (!WalletModel::isWalletEnabled()) {
+        return;
+    }
+    m_handler_load_wallet = m_node->walletClient().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 (const 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
     shutdown();
     event->ignore();
 }
diff --git a/src/qt/splashscreen.h b/src/qt/splashscreen.h
index dd4e71f5a..4f75a01c7 100644
--- a/src/qt/splashscreen.h
+++ b/src/qt/splashscreen.h
@@ -1,74 +1,77 @@
 // 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.
 
 #ifndef BITCOIN_QT_SPLASHSCREEN_H
 #define BITCOIN_QT_SPLASHSCREEN_H
 
 #include <QWidget>
 
 #include <memory>
 
 class NetworkStyle;
 
 namespace interfaces {
 class Handler;
 class Node;
 class Wallet;
 }; // namespace interfaces
 
 /** Class for the splashscreen with information of the running client.
  *
  * @note this is intentionally not a QSplashScreen. Bitcoin Core initialization
  * can take a long time, and in that case a progress window that cannot be moved
  * around and minimized has turned out to be frustrating to the user.
  */
 class SplashScreen : public QWidget {
     Q_OBJECT
 
 public:
     explicit SplashScreen(const NetworkStyle *networkStyle);
     ~SplashScreen();
     void setNode(interfaces::Node &node);
 
 protected:
     void paintEvent(QPaintEvent *event) override;
     void closeEvent(QCloseEvent *event) override;
 
 public Q_SLOTS:
     /** Hide the splash screen window and schedule the splash screen object for
      * deletion */
     void finish();
 
     /** Show message and progress */
     void showMessage(const QString &message, int alignment,
                      const QColor &color);
 
+    /** Handle wallet load notifications. */
+    void handleLoadWallet();
+
 protected:
     bool eventFilter(QObject *obj, QEvent *ev) override;
 
 private:
     /** Connect core signals to splash screen */
     void subscribeToCoreSignals();
     /** Disconnect core signals to splash screen */
     void unsubscribeFromCoreSignals();
     /** Initiate shutdown */
     void shutdown();
     /** Connect wallet signals to splash screen */
     void ConnectWallet(std::unique_ptr<interfaces::Wallet> wallet);
 
     QPixmap pixmap;
     QString curMessage;
     QColor curColor;
     int curAlignment;
 
     interfaces::Node *m_node = nullptr;
     bool m_shutdown = false;
     std::unique_ptr<interfaces::Handler> m_handler_init_message;
     std::unique_ptr<interfaces::Handler> m_handler_show_progress;
     std::unique_ptr<interfaces::Handler> m_handler_load_wallet;
     std::list<std::unique_ptr<interfaces::Wallet>> m_connected_wallets;
     std::list<std::unique_ptr<interfaces::Handler>> m_connected_wallet_handlers;
 };
 
 #endif // BITCOIN_QT_SPLASHSCREEN_H
diff --git a/src/qt/walletcontroller.cpp b/src/qt/walletcontroller.cpp
index 0702d266c..7865e212a 100644
--- a/src/qt/walletcontroller.cpp
+++ b/src/qt/walletcontroller.cpp
@@ -1,353 +1,356 @@
 // Copyright (c) 2019 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/walletcontroller.h>
 
 #include <qt/askpassphrasedialog.h>
 #include <qt/clientmodel.h>
 #include <qt/createwalletdialog.h>
 #include <qt/guiconstants.h>
 #include <qt/guiutil.h>
 
 #include <interfaces/handler.h>
 #include <interfaces/node.h>
 #include <util/string.h>
 #include <util/translation.h>
 #include <wallet/wallet.h>
 
 #include <QApplication>
 #include <QMutexLocker>
 #include <QTimer>
 #include <QWindow>
 
 #include <algorithm>
 
 WalletController::WalletController(ClientModel &client_model,
                                    const PlatformStyle *platform_style,
                                    QObject *parent)
     : QObject(parent), m_activity_thread(new QThread(this)),
       m_activity_worker(new QObject), m_client_model(client_model),
       m_node(client_model.node()), m_platform_style(platform_style),
       m_options_model(client_model.getOptionsModel()) {
-    m_handler_load_wallet = m_node.handleLoadWallet(
+    m_handler_load_wallet = m_node.walletClient().handleLoadWallet(
         [this](std::unique_ptr<interfaces::Wallet> wallet) {
             getOrCreateWallet(std::move(wallet));
         });
 
-    for (std::unique_ptr<interfaces::Wallet> &wallet : m_node.getWallets()) {
+    for (std::unique_ptr<interfaces::Wallet> &wallet :
+         m_node.walletClient().getWallets()) {
         getOrCreateWallet(std::move(wallet));
     }
 
     m_activity_worker->moveToThread(m_activity_thread);
     m_activity_thread->start();
 }
 
 // Not using the default destructor because not all member types definitions are
 // available in the header, just forward declared.
 WalletController::~WalletController() {
     m_activity_thread->quit();
     m_activity_thread->wait();
     delete m_activity_worker;
 }
 
 std::vector<WalletModel *> WalletController::getOpenWallets() const {
     QMutexLocker locker(&m_mutex);
     return m_wallets;
 }
 
 std::map<std::string, bool> WalletController::listWalletDir() const {
     QMutexLocker locker(&m_mutex);
     std::map<std::string, bool> wallets;
-    for (const std::string &name : m_node.listWalletDir()) {
+    for (const std::string &name : m_node.walletClient().listWalletDir()) {
         wallets[name] = false;
     }
     for (WalletModel *wallet_model : m_wallets) {
         auto it = wallets.find(wallet_model->wallet().getWalletName());
         if (it != wallets.end()) {
             it->second = true;
         }
     }
     return wallets;
 }
 
 void WalletController::closeWallet(WalletModel *wallet_model, QWidget *parent) {
     QMessageBox box(parent);
     box.setWindowTitle(tr("Close wallet"));
     box.setText(tr("Are you sure you wish to close the wallet <i>%1</i>?")
                     .arg(GUIUtil::HtmlEscape(wallet_model->getDisplayName())));
     box.setInformativeText(
         tr("Closing the wallet for too long can result in having to resync the "
            "entire chain if pruning is enabled."));
     box.setStandardButtons(QMessageBox::Yes | QMessageBox::Cancel);
     box.setDefaultButton(QMessageBox::Yes);
     if (box.exec() != QMessageBox::Yes) {
         return;
     }
 
     // First remove wallet from node.
     wallet_model->wallet().remove();
     // Now release the model.
     removeAndDeleteWallet(wallet_model);
 }
 
 void WalletController::closeAllWallets(QWidget *parent) {
     QMessageBox::StandardButton button = QMessageBox::question(
         parent, tr("Close all wallets"),
         tr("Are you sure you wish to close all wallets?"),
         QMessageBox::Yes | QMessageBox::Cancel, QMessageBox::Yes);
     if (button != QMessageBox::Yes) {
         return;
     }
 
     QMutexLocker locker(&m_mutex);
     for (WalletModel *wallet_model : m_wallets) {
         wallet_model->wallet().remove();
         Q_EMIT walletRemoved(wallet_model);
         delete wallet_model;
     }
     m_wallets.clear();
 }
 
 WalletModel *WalletController::getOrCreateWallet(
     std::unique_ptr<interfaces::Wallet> wallet) {
     QMutexLocker locker(&m_mutex);
 
     // Return model instance if exists.
     if (!m_wallets.empty()) {
         std::string name = wallet->getWalletName();
         for (WalletModel *wallet_model : m_wallets) {
             if (wallet_model->wallet().getWalletName() == name) {
                 return wallet_model;
             }
         }
     }
 
     // Instantiate model and register it.
     WalletModel *wallet_model = new WalletModel(
         std::move(wallet), m_client_model, m_platform_style, nullptr);
     // Handler callback runs in a different thread so fix wallet model thread
     // affinity.
     wallet_model->moveToThread(thread());
     wallet_model->setParent(this);
     m_wallets.push_back(wallet_model);
 
     // WalletModel::startPollBalance needs to be called in a thread managed by
     // Qt because of startTimer. Considering the current thread can be a RPC
     // thread, better delegate the calling to Qt with Qt::AutoConnection.
     const bool called =
         QMetaObject::invokeMethod(wallet_model, "startPollBalance");
     assert(called);
 
     connect(
         wallet_model, &WalletModel::unload, this,
         [this, wallet_model] {
             // Defer removeAndDeleteWallet when no modal widget is active.
             // TODO: remove this workaround by removing usage of QDiallog::exec.
             if (QApplication::activeModalWidget()) {
                 connect(
                     qApp, &QApplication::focusWindowChanged, wallet_model,
                     [this, wallet_model]() {
                         if (!QApplication::activeModalWidget()) {
                             removeAndDeleteWallet(wallet_model);
                         }
                     },
                     Qt::QueuedConnection);
             } else {
                 removeAndDeleteWallet(wallet_model);
             }
         },
         Qt::QueuedConnection);
 
     // Re-emit coinsSent signal from wallet model.
     connect(wallet_model, &WalletModel::coinsSent, this,
             &WalletController::coinsSent);
 
     // Notify walletAdded signal on the GUI thread.
     Q_EMIT walletAdded(wallet_model);
 
     return wallet_model;
 }
 
 void WalletController::removeAndDeleteWallet(WalletModel *wallet_model) {
     // Unregister wallet model.
     {
         QMutexLocker locker(&m_mutex);
         m_wallets.erase(
             std::remove(m_wallets.begin(), m_wallets.end(), wallet_model));
     }
     Q_EMIT walletRemoved(wallet_model);
     // Currently this can trigger the unload since the model can hold the last
     // CWallet shared pointer.
     delete wallet_model;
 }
 
 WalletControllerActivity::WalletControllerActivity(
     WalletController *wallet_controller, QWidget *parent_widget,
     const CChainParams &chainparams)
     : QObject(wallet_controller), m_wallet_controller(wallet_controller),
       m_parent_widget(parent_widget), m_chainparams(chainparams) {}
 
 WalletControllerActivity::~WalletControllerActivity() {
     delete m_progress_dialog;
 }
 
 void WalletControllerActivity::showProgressDialog(const QString &label_text) {
     assert(!m_progress_dialog);
     m_progress_dialog = new QProgressDialog(m_parent_widget);
 
     m_progress_dialog->setLabelText(label_text);
     m_progress_dialog->setRange(0, 0);
     m_progress_dialog->setCancelButton(nullptr);
     m_progress_dialog->setWindowModality(Qt::ApplicationModal);
     GUIUtil::PolishProgressDialog(m_progress_dialog);
 }
 
 void WalletControllerActivity::destroyProgressDialog() {
     assert(m_progress_dialog);
     delete m_progress_dialog;
     m_progress_dialog = nullptr;
 }
 
 CreateWalletActivity::CreateWalletActivity(WalletController *wallet_controller,
                                            QWidget *parent_widget,
                                            const CChainParams &chainparams)
     : WalletControllerActivity(wallet_controller, parent_widget, chainparams) {
     m_passphrase.reserve(MAX_PASSPHRASE_SIZE);
 }
 
 CreateWalletActivity::~CreateWalletActivity() {
     delete m_create_wallet_dialog;
     delete m_passphrase_dialog;
 }
 
 void CreateWalletActivity::askPassphrase() {
     m_passphrase_dialog = new AskPassphraseDialog(
         AskPassphraseDialog::Encrypt, m_parent_widget, &m_passphrase);
     m_passphrase_dialog->setWindowModality(Qt::ApplicationModal);
     m_passphrase_dialog->show();
 
     connect(m_passphrase_dialog, &QObject::destroyed,
             [this] { m_passphrase_dialog = nullptr; });
     connect(m_passphrase_dialog, &QDialog::accepted,
             [this] { createWallet(); });
     connect(m_passphrase_dialog, &QDialog::rejected,
             [this] { Q_EMIT finished(); });
 }
 
 void CreateWalletActivity::createWallet() {
     showProgressDialog(
         tr("Creating Wallet <b>%1</b>...")
             .arg(m_create_wallet_dialog->walletName().toHtmlEscaped()));
 
     std::string name = m_create_wallet_dialog->walletName().toStdString();
     uint64_t flags = 0;
     if (m_create_wallet_dialog->isDisablePrivateKeysChecked()) {
         flags |= WALLET_FLAG_DISABLE_PRIVATE_KEYS;
     }
     if (m_create_wallet_dialog->isMakeBlankWalletChecked()) {
         flags |= WALLET_FLAG_BLANK_WALLET;
     }
     if (m_create_wallet_dialog->isDescriptorWalletChecked()) {
         flags |= WALLET_FLAG_DESCRIPTORS;
     }
 
     QTimer::singleShot(500, worker(), [this, name, flags] {
         WalletCreationStatus status;
         std::unique_ptr<interfaces::Wallet> wallet =
-            node().createWallet(m_chainparams, m_passphrase, flags, name,
-                                m_error_message, m_warning_message, status);
+            node().walletClient().createWallet(
+                m_chainparams, name, m_passphrase, flags, status,
+                m_error_message, m_warning_message);
 
         if (status == WalletCreationStatus::SUCCESS) {
             m_wallet_model =
                 m_wallet_controller->getOrCreateWallet(std::move(wallet));
         }
 
         QTimer::singleShot(500, this, &CreateWalletActivity::finish);
     });
 }
 
 void CreateWalletActivity::finish() {
     destroyProgressDialog();
 
     if (!m_error_message.empty()) {
         QMessageBox::critical(
             m_parent_widget, tr("Create wallet failed"),
             QString::fromStdString(m_error_message.translated));
     } else if (!m_warning_message.empty()) {
         QMessageBox::warning(
             m_parent_widget, tr("Create wallet warning"),
             QString::fromStdString(
                 Join(m_warning_message, Untranslated("\n")).translated));
     }
 
     if (m_wallet_model) {
         Q_EMIT created(m_wallet_model);
     }
 
     Q_EMIT finished();
 }
 
 void CreateWalletActivity::create() {
     m_create_wallet_dialog = new CreateWalletDialog(m_parent_widget);
     m_create_wallet_dialog->setWindowModality(Qt::ApplicationModal);
     m_create_wallet_dialog->show();
 
     connect(m_create_wallet_dialog, &QObject::destroyed,
             [this] { m_create_wallet_dialog = nullptr; });
     connect(m_create_wallet_dialog, &QDialog::rejected,
             [this] { Q_EMIT finished(); });
     connect(m_create_wallet_dialog, &QDialog::accepted, [this] {
         if (m_create_wallet_dialog->isEncryptWalletChecked()) {
             askPassphrase();
         } else {
             createWallet();
         }
     });
 }
 
 OpenWalletActivity::OpenWalletActivity(WalletController *wallet_controller,
                                        QWidget *parent_widget,
                                        const CChainParams &chainparams)
     : WalletControllerActivity(wallet_controller, parent_widget, chainparams) {}
 
 void OpenWalletActivity::finish() {
     destroyProgressDialog();
 
     if (!m_error_message.empty()) {
         QMessageBox::critical(
             m_parent_widget, tr("Open wallet failed"),
             QString::fromStdString(m_error_message.translated));
     } else if (!m_warning_message.empty()) {
         QMessageBox::warning(
             m_parent_widget, tr("Open wallet warning"),
             QString::fromStdString(
                 Join(m_warning_message, Untranslated("\n")).translated));
     }
 
     if (m_wallet_model) {
         Q_EMIT opened(m_wallet_model);
     }
 
     Q_EMIT finished();
 }
 
 void OpenWalletActivity::open(const std::string &path) {
     QString name = path.empty() ? QString("[" + tr("default wallet") + "]")
                                 : QString::fromStdString(path);
 
     showProgressDialog(
         tr("Opening Wallet <b>%1</b>...").arg(name.toHtmlEscaped()));
 
     QTimer::singleShot(0, worker(), [this, path] {
-        std::unique_ptr<interfaces::Wallet> wallet = node().loadWallet(
-            this->m_chainparams, path, m_error_message, m_warning_message);
+        std::unique_ptr<interfaces::Wallet> wallet =
+            node().walletClient().loadWallet(
+                this->m_chainparams, path, m_error_message, m_warning_message);
 
         if (wallet) {
             m_wallet_model =
                 m_wallet_controller->getOrCreateWallet(std::move(wallet));
         }
 
         QTimer::singleShot(0, this, &OpenWalletActivity::finish);
     });
 }
diff --git a/src/qt/walletmodel.cpp b/src/qt/walletmodel.cpp
index 401ce7be8..673675e58 100644
--- a/src/qt/walletmodel.cpp
+++ b/src/qt/walletmodel.cpp
@@ -1,537 +1,537 @@
 // Copyright (c) 2011-2019 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 <node/ui_interface.h>
 #include <psbt.h>
 #include <qt/addresstablemodel.h>
 #include <qt/clientmodel.h>
 #include <qt/guiconstants.h>
 #include <qt/paymentserver.h>
 #include <qt/recentrequeststablemodel.h>
 #include <qt/transactiontablemodel.h>
 #include <util/system.h> // for GetBoolArg
 #include <util/translation.h>
 #include <wallet/coincontrol.h>
 #include <wallet/wallet.h> // for CRecipient
 
 #include <QDebug>
 #include <QSet>
 #include <QTimer>
 
 #include <cstdint>
 
 WalletModel::WalletModel(std::unique_ptr<interfaces::Wallet> wallet,
                          ClientModel &client_model,
                          const PlatformStyle *platformStyle, QObject *parent)
     : QObject(parent), m_wallet(std::move(wallet)),
       m_client_model(&client_model), m_node(client_model.node()),
       optionsModel(client_model.getOptionsModel()), addressTableModel(nullptr),
       transactionTableModel(nullptr), recentRequestsTableModel(nullptr),
       cachedEncryptionStatus(Unencrypted), timer(new QTimer(this)) {
     fHaveWatchOnly = m_wallet->haveWatchOnly();
     addressTableModel = new AddressTableModel(this);
     transactionTableModel = new TransactionTableModel(platformStyle, this);
     recentRequestsTableModel = new RecentRequestsTableModel(this);
 
     subscribeToCoreSignals();
 }
 
 WalletModel::~WalletModel() {
     unsubscribeFromCoreSignals();
 }
 
 void WalletModel::startPollBalance() {
     // This timer will be fired repeatedly to update the balance
     connect(timer, &QTimer::timeout, this, &WalletModel::pollBalanceChanged);
     timer->start(MODEL_UPDATE_DELAY);
 }
 
 void WalletModel::setClientModel(ClientModel *client_model) {
     m_client_model = client_model;
     if (!m_client_model) {
         timer->stop();
     }
 }
 
 void WalletModel::updateStatus() {
     EncryptionStatus newEncryptionStatus = getEncryptionStatus();
 
     if (cachedEncryptionStatus != newEncryptionStatus) {
         Q_EMIT encryptionStatusChanged();
     }
 }
 
 void WalletModel::pollBalanceChanged() {
     // Avoid recomputing wallet balances unless a TransactionChanged or
     // BlockTip notification was received.
     if (!fForceCheckBalanceChanged &&
         m_cached_last_update_tip == getLastBlockProcessed()) {
         return;
     }
 
     // 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;
     BlockHash block_hash;
     if (!m_wallet->tryGetBalances(new_balances, block_hash)) {
         return;
     }
 
     if (fForceCheckBalanceChanged || block_hash != m_cached_last_update_tip) {
         fForceCheckBalanceChanged = false;
 
         // Balance and number of transactions might have changed
         m_cached_last_update_tip = block_hash;
 
         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;
         }
 
 #ifdef ENABLE_BIP70
         // 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;
         }
 
         // User-entered bitcoin address / amount:
         else
 #endif
         {
             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;
     bilingual_str error;
 
     auto &newTx = transaction.getWtx();
     newTx = m_wallet->createTransaction(
         vecSend, coinControl, !wallet().privateKeysDisabled() /* sign */,
         nChangePosRet, nFeeRequired, error);
     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(error.translated),
                        CClientUIInterface::MSG_ERROR);
         return TransactionCreationFailed;
     }
 
     // Reject absurdly high fee. (This can never happen because the
     // wallet never creates transactions with fee greater than
     // m_default_max_tx_fee. This merely a belt-and-suspenders check).
     if (nFeeRequired > m_wallet->getDefaultMaxTxFee()) {
         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()) {
 #ifdef ENABLE_BIP70
         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
 #endif
         {
             if (!rcp.message.isEmpty()) {
                 // Message from normal bitcoincash:URI
                 // (bitcoincash:123...?message=example)
                 vOrderForm.emplace_back("Message", rcp.message.toStdString());
             }
         }
     }
 
     auto &newTx = transaction.getWtx();
     wallet().commitTransaction(newTx, {} /* mapValue */, std::move(vOrderForm));
 
     CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
     ssTx << *newTx;
     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
 #ifdef ENABLE_BIP70
         if (!rcp.paymentRequest.IsInitialized())
 #endif
         {
             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->wallet(), 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) {
         return m_wallet->encryptWallet(passphrase);
     }
     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 NotifyUnload(WalletModel *walletModel) {
     qDebug() << "NotifyUnload";
     bool invoked = QMetaObject::invokeMethod(walletModel, "unload");
     assert(invoked);
 }
 
 static void NotifyKeyStoreStatusChanged(WalletModel *walletmodel) {
     qDebug() << "NotifyKeyStoreStatusChanged";
     bool invoked = QMetaObject::invokeMethod(walletmodel, "updateStatus",
                                              Qt::QueuedConnection);
     assert(invoked);
 }
 
 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);
     bool invoked = 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));
     assert(invoked);
 }
 
 static void NotifyTransactionChanged(WalletModel *walletmodel, const TxId &hash,
                                      ChangeType status) {
     Q_UNUSED(hash);
     Q_UNUSED(status);
     bool invoked = QMetaObject::invokeMethod(walletmodel, "updateTransaction",
                                              Qt::QueuedConnection);
     assert(invoked);
 }
 
 static void ShowProgress(WalletModel *walletmodel, const std::string &title,
                          int nProgress) {
     // emits signal "showProgress"
     bool invoked = QMetaObject::invokeMethod(
         walletmodel, "showProgress", Qt::QueuedConnection,
         Q_ARG(QString, QString::fromStdString(title)), Q_ARG(int, nProgress));
     assert(invoked);
 }
 
 static void NotifyWatchonlyChanged(WalletModel *walletmodel,
                                    bool fHaveWatchonly) {
     bool invoked = QMetaObject::invokeMethod(walletmodel, "updateWatchOnlyFlag",
                                              Qt::QueuedConnection,
                                              Q_ARG(bool, fHaveWatchonly));
     assert(invoked);
 }
 
 static void NotifyCanGetAddressesChanged(WalletModel *walletmodel) {
     bool invoked =
         QMetaObject::invokeMethod(walletmodel, "canGetAddressesChanged");
     assert(invoked);
 }
 
 void WalletModel::subscribeToCoreSignals() {
     // Connect signals to wallet
     m_handler_unload = m_wallet->handleUnload(std::bind(&NotifyUnload, this));
     m_handler_status_changed = m_wallet->handleStatusChanged(
         std::bind(&NotifyKeyStoreStatusChanged, this));
     m_handler_address_book_changed = m_wallet->handleAddressBookChanged(
         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(
         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(
         std::bind(NotifyWatchonlyChanged, this, std::placeholders::_1));
     m_handler_can_get_addrs_changed = m_wallet->handleCanGetAddressesChanged(
         std::bind(NotifyCanGetAddressesChanged, this));
 }
 
 void WalletModel::unsubscribeFromCoreSignals() {
     // Disconnect signals from wallet
     m_handler_unload->disconnect();
     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();
     m_handler_can_get_addrs_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(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());
 }
 
 QString WalletModel::getDisplayName() const {
     const QString name = getWalletName();
     return name.isEmpty() ? "[" + tr("default wallet") + "]" : name;
 }
 
 bool WalletModel::isMultiwallet() {
-    return m_node.getWallets().size() > 1;
+    return m_node.walletClient().getWallets().size() > 1;
 }
 
 const CChainParams &WalletModel::getChainParams() const {
     return Params();
 }
 
 BlockHash WalletModel::getLastBlockProcessed() const {
     return m_client_model ? m_client_model->getBestBlockHash() : BlockHash{};
 }
diff --git a/src/wallet/init.cpp b/src/wallet/init.cpp
index 2224abb71..8e19e4ffc 100644
--- a/src/wallet/init.cpp
+++ b/src/wallet/init.cpp
@@ -1,231 +1,234 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2017 The Bitcoin Core developers
 // Copyright (c) 2018-2020 The Bitcoin developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <config.h>
 #include <init.h>
 #include <interfaces/chain.h>
+#include <interfaces/wallet.h>
 #include <net.h>
 #include <network.h>
 #include <node/context.h>
 #include <node/ui_interface.h>
 #include <util/check.h>
 #include <util/moneystr.h>
 #include <util/system.h>
 #include <util/translation.h>
 #include <wallet/coincontrol.h>
 #include <wallet/rpcdump.h>
 #include <wallet/wallet.h>
 #include <walletinitinterface.h>
 
 class WalletInit : public WalletInitInterface {
 public:
     //! Was the wallet component compiled in.
     bool HasWalletSupport() const override { return true; }
 
     //! Return the wallets help message.
     void AddWalletOptions(ArgsManager &argsman) const override;
 
     //! Wallets parameter interaction
     bool ParameterInteraction() const override;
 
     //! Add wallets that should be opened to list of chain clients.
     void Construct(NodeContext &node) const override;
 };
 
 const WalletInitInterface &g_wallet_init_interface = WalletInit();
 
 void WalletInit::AddWalletOptions(ArgsManager &argsman) const {
     argsman.AddArg(
         "-avoidpartialspends",
         strprintf("Group outputs by address, selecting all or none, instead of "
                   "selecting on a per-output basis. Privacy is improved as an "
                   "address is only used once (unless someone sends to it after "
                   "spending from it), but may result in slightly higher fees "
                   "as suboptimal coin selection may result due to the added "
                   "limitation (default: %u (always enabled for wallets with "
                   "\"avoid_reuse\" enabled))",
                   DEFAULT_AVOIDPARTIALSPENDS),
         ArgsManager::ALLOW_ANY, OptionsCategory::WALLET);
 
     argsman.AddArg("-disablewallet",
                    "Do not load the wallet and disable wallet RPC calls",
                    ArgsManager::ALLOW_ANY, OptionsCategory::WALLET);
     const auto &ticker = Currency::get().ticker;
     argsman.AddArg("-fallbackfee=<amt>",
                    strprintf("A fee rate (in %s/kB) that will be used when fee "
                              "estimation has insufficient data. 0 to entirely "
                              "disable the fallbackfee feature. (default: %s)",
                              ticker, FormatMoney(DEFAULT_FALLBACK_FEE)),
                    ArgsManager::ALLOW_ANY, OptionsCategory::WALLET);
     argsman.AddArg(
         "-keypool=<n>",
         strprintf("Set key pool size to <n> (default: %u). Warning: Smaller "
                   "sizes may increase the risk of losing funds when restoring "
                   "from an old backup, if none of the addresses in the "
                   "original keypool have been used.",
                   DEFAULT_KEYPOOL_SIZE),
         ArgsManager::ALLOW_ANY, OptionsCategory::WALLET);
     argsman.AddArg(
         "-maxapsfee=<n>",
         strprintf(
             "Spend up to this amount in additional (absolute) fees (in %s) if "
             "it allows the use of partial spend avoidance (default: %s)",
             ticker, FormatMoney(DEFAULT_MAX_AVOIDPARTIALSPEND_FEE)),
         ArgsManager::ALLOW_ANY, OptionsCategory::WALLET);
     argsman.AddArg(
         "-maxtxfee=<amt>",
         strprintf("Maximum total fees (in %s) to use in a single wallet "
                   "transaction or raw transaction; setting this too low may "
                   "abort large transactions (default: %s)",
                   ticker, FormatMoney(DEFAULT_TRANSACTION_MAXFEE)),
         ArgsManager::ALLOW_ANY, OptionsCategory::DEBUG_TEST);
     argsman.AddArg("-mintxfee=<amt>",
                    strprintf("Fees (in %s/kB) smaller than this are considered "
                              "zero fee for transaction creation (default: %s)",
                              ticker,
                              FormatMoney(DEFAULT_TRANSACTION_MINFEE_PER_KB)),
                    ArgsManager::ALLOW_ANY, OptionsCategory::WALLET);
     argsman.AddArg(
         "-paytxfee=<amt>",
         strprintf(
             "Fee (in %s/kB) to add to transactions you send (default: %s)",
             ticker, FormatMoney(CFeeRate{DEFAULT_PAY_TX_FEE}.GetFeePerK())),
         ArgsManager::ALLOW_ANY, OptionsCategory::WALLET);
     argsman.AddArg(
         "-rescan",
         "Rescan the block chain for missing wallet transactions on startup",
         ArgsManager::ALLOW_ANY, OptionsCategory::WALLET);
     argsman.AddArg(
         "-spendzeroconfchange",
         strprintf(
             "Spend unconfirmed change when sending transactions (default: %d)",
             DEFAULT_SPEND_ZEROCONF_CHANGE),
         ArgsManager::ALLOW_ANY, OptionsCategory::WALLET);
     argsman.AddArg(
         "-wallet=<path>",
         "Specify wallet database path. Can be specified multiple "
         "times to load multiple wallets. Path is interpreted relative "
         "to <walletdir> if it is not absolute, and will be created if "
         "it does not exist (as a directory containing a wallet.dat "
         "file and log files). For backwards compatibility this will "
         "also accept names of existing data files in <walletdir>.)",
         ArgsManager::ALLOW_ANY | ArgsManager::NETWORK_ONLY,
         OptionsCategory::WALLET);
     argsman.AddArg(
         "-walletbroadcast",
         strprintf("Make the wallet broadcast transactions (default: %d)",
                   DEFAULT_WALLETBROADCAST),
         ArgsManager::ALLOW_ANY, OptionsCategory::WALLET);
     argsman.AddArg("-walletdir=<dir>",
                    "Specify directory to hold wallets (default: "
                    "<datadir>/wallets if it exists, otherwise <datadir>)",
                    ArgsManager::ALLOW_ANY | ArgsManager::NETWORK_ONLY,
                    OptionsCategory::WALLET);
 #if defined(HAVE_SYSTEM)
     argsman.AddArg(
         "-walletnotify=<cmd>",
         "Execute command when a wallet transaction changes. %s in cmd "
         "is replaced by TxID and %w is replaced by wallet name. %w is "
         "not currently implemented on windows. On systems where %w is "
         "supported, it should NOT be quoted because this would break "
         "shell escaping used to invoke the command.",
         ArgsManager::ALLOW_ANY, OptionsCategory::WALLET);
 #endif
     argsman.AddArg(
         "-zapwallettxes=<mode>",
         "Delete all wallet transactions and only recover those parts of the "
         "blockchain through -rescan on startup (1 = keep tx meta data e.g. "
         "payment request information, 2 = drop tx meta data)",
         ArgsManager::ALLOW_ANY, OptionsCategory::WALLET);
 
     argsman.AddArg(
         "-dblogsize=<n>",
         strprintf("Flush wallet database activity from memory to disk "
                   "log every <n> megabytes (default: %u)",
                   DEFAULT_WALLET_DBLOGSIZE),
         ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY,
         OptionsCategory::WALLET_DEBUG_TEST);
     argsman.AddArg(
         "-flushwallet",
         strprintf("Run a thread to flush wallet periodically (default: %d)",
                   DEFAULT_FLUSHWALLET),
         ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY,
         OptionsCategory::WALLET_DEBUG_TEST);
     argsman.AddArg("-privdb",
                    strprintf("Sets the DB_PRIVATE flag in the wallet db "
                              "environment (default: %d)",
                              DEFAULT_WALLET_PRIVDB),
                    ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY,
                    OptionsCategory::WALLET_DEBUG_TEST);
     argsman.AddArg("-walletrejectlongchains",
                    strprintf("Wallet will not create transactions that violate "
                              "mempool chain limits (default: %d)",
                              DEFAULT_WALLET_REJECT_LONG_CHAINS),
                    ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY,
                    OptionsCategory::WALLET_DEBUG_TEST);
 }
 
 bool WalletInit::ParameterInteraction() const {
     if (gArgs.GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET)) {
         for (const std::string &wallet : gArgs.GetArgs("-wallet")) {
             LogPrintf("%s: parameter interaction: -disablewallet -> ignoring "
                       "-wallet=%s\n",
                       __func__, wallet);
         }
 
         return true;
     }
 
     const bool is_multiwallet = gArgs.GetArgs("-wallet").size() > 1;
 
     if (gArgs.GetBoolArg("-blocksonly", DEFAULT_BLOCKSONLY) &&
         gArgs.SoftSetBoolArg("-walletbroadcast", false)) {
         LogPrintf("%s: parameter interaction: -blocksonly=1 -> setting "
                   "-walletbroadcast=0\n",
                   __func__);
     }
 
     bool zapwallettxes = gArgs.GetBoolArg("-zapwallettxes", false);
     // -zapwallettxes implies dropping the mempool on startup
     if (zapwallettxes && gArgs.SoftSetBoolArg("-persistmempool", false)) {
         LogPrintf("%s: parameter interaction: -zapwallettxes enabled -> "
                   "setting -persistmempool=0\n",
                   __func__);
     }
 
     // -zapwallettxes implies a rescan
     if (zapwallettxes) {
         if (is_multiwallet) {
             return InitError(strprintf(
                 Untranslated("%s is only allowed with a single wallet file"),
                 "-zapwallettxes"));
         }
         if (gArgs.SoftSetBoolArg("-rescan", true)) {
             LogPrintf("%s: parameter interaction: -zapwallettxes enabled -> "
                       "setting -rescan=1\n",
                       __func__);
         }
     }
 
     if (gArgs.GetBoolArg("-sysperms", false)) {
         return InitError(
             Untranslated("-sysperms is not allowed in combination with enabled "
                          "wallet functionality"));
     }
 
     return true;
 }
 
 void WalletInit::Construct(NodeContext &node) const {
     ArgsManager &args = *Assert(node.args);
     if (args.GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET)) {
         LogPrintf("Wallet disabled!\n");
         return;
     }
     args.SoftSetArg("-wallet", "");
-    node.chain_clients.emplace_back(interfaces::MakeWalletClient(
-        *node.chain, args, args.GetArgs("-wallet")));
+    auto wallet_client = interfaces::MakeWalletClient(*node.chain, args,
+                                                      args.GetArgs("-wallet"));
+    node.wallet_client = wallet_client.get();
+    node.chain_clients.emplace_back(std::move(wallet_client));
 }
diff --git a/src/wallet/test/init_test_fixture.cpp b/src/wallet/test/init_test_fixture.cpp
index 02635c01d..7d083a0e5 100644
--- a/src/wallet/test/init_test_fixture.cpp
+++ b/src/wallet/test/init_test_fixture.cpp
@@ -1,47 +1,47 @@
 // 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.
 
 #include <wallet/test/init_test_fixture.h>
 
 #include <chainparams.h>
 #include <fs.h>
 #include <util/check.h>
 #include <util/system.h>
 
 InitWalletDirTestingSetup::InitWalletDirTestingSetup(
     const std::string &chainName)
     : BasicTestingSetup(chainName) {
     m_chain = interfaces::MakeChain(m_node, Params());
-    m_chain_client = MakeWalletClient(*m_chain, *Assert(m_node.args), {});
+    m_wallet_client = MakeWalletClient(*m_chain, *Assert(m_node.args), {});
 
     std::string sep;
     sep += fs::path::preferred_separator;
 
     m_datadir = GetDataDir();
     m_cwd = fs::current_path();
 
     m_walletdir_path_cases["default"] = m_datadir / "wallets";
     m_walletdir_path_cases["custom"] = m_datadir / "my_wallets";
     m_walletdir_path_cases["nonexistent"] = m_datadir / "path_does_not_exist";
     m_walletdir_path_cases["file"] = m_datadir / "not_a_directory.dat";
     m_walletdir_path_cases["trailing"] = m_datadir / "wallets" / sep;
     m_walletdir_path_cases["trailing2"] = m_datadir / "wallets" / sep / sep;
 
     fs::current_path(m_datadir);
     m_walletdir_path_cases["relative"] = "wallets";
 
     fs::create_directories(m_walletdir_path_cases["default"]);
     fs::create_directories(m_walletdir_path_cases["custom"]);
     fs::create_directories(m_walletdir_path_cases["relative"]);
     std::ofstream f(m_walletdir_path_cases["file"].BOOST_FILESYSTEM_C_STR);
     f.close();
 }
 
 InitWalletDirTestingSetup::~InitWalletDirTestingSetup() {
     fs::current_path(m_cwd);
 }
 
 void InitWalletDirTestingSetup::SetWalletDir(const fs::path &walletdir_path) {
     gArgs.ForceSetArg("-walletdir", walletdir_path.string());
 }
diff --git a/src/wallet/test/init_test_fixture.h b/src/wallet/test/init_test_fixture.h
index 8e6bfd1c8..fcc892d31 100644
--- a/src/wallet/test/init_test_fixture.h
+++ b/src/wallet/test/init_test_fixture.h
@@ -1,26 +1,26 @@
 // 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.
 
 #ifndef BITCOIN_WALLET_TEST_INIT_TEST_FIXTURE_H
 #define BITCOIN_WALLET_TEST_INIT_TEST_FIXTURE_H
 
 #include <interfaces/chain.h>
-
+#include <interfaces/wallet.h>
 #include <node/context.h>
 #include <test/util/setup_common.h>
 
 struct InitWalletDirTestingSetup : public BasicTestingSetup {
     explicit InitWalletDirTestingSetup(
         const std::string &chainName = CBaseChainParams::MAIN);
     ~InitWalletDirTestingSetup();
     void SetWalletDir(const fs::path &walletdir_path);
 
     fs::path m_datadir;
     fs::path m_cwd;
     std::map<std::string, fs::path> m_walletdir_path_cases;
     std::unique_ptr<interfaces::Chain> m_chain;
-    std::unique_ptr<interfaces::ChainClient> m_chain_client;
+    std::unique_ptr<interfaces::WalletClient> m_wallet_client;
 };
 
 #endif // BITCOIN_WALLET_TEST_INIT_TEST_FIXTURE_H
diff --git a/src/wallet/test/init_tests.cpp b/src/wallet/test/init_tests.cpp
index 6569e98b2..8843d08f1 100644
--- a/src/wallet/test/init_tests.cpp
+++ b/src/wallet/test/init_tests.cpp
@@ -1,80 +1,80 @@
 // 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.
 
 #include <chainparams.h>
 #include <noui.h>
 #include <test/util/logging.h>
 #include <util/system.h>
 
 #include <test/util/setup_common.h>
 #include <wallet/test/init_test_fixture.h>
 
 #include <boost/test/unit_test.hpp>
 
 BOOST_FIXTURE_TEST_SUITE(init_tests, InitWalletDirTestingSetup)
 
 BOOST_AUTO_TEST_CASE(walletinit_verify_walletdir_default) {
     SetWalletDir(m_walletdir_path_cases["default"]);
-    bool result = m_chain_client->verify(Params());
+    bool result = m_wallet_client->verify(Params());
     BOOST_CHECK(result == true);
     fs::path walletdir = gArgs.GetArg("-walletdir", "");
     fs::path expected_path = fs::canonical(m_walletdir_path_cases["default"]);
     BOOST_CHECK(walletdir == expected_path);
 }
 
 BOOST_AUTO_TEST_CASE(walletinit_verify_walletdir_custom) {
     SetWalletDir(m_walletdir_path_cases["custom"]);
-    bool result = m_chain_client->verify(Params());
+    bool result = m_wallet_client->verify(Params());
     BOOST_CHECK(result == true);
     fs::path walletdir = gArgs.GetArg("-walletdir", "");
     fs::path expected_path = fs::canonical(m_walletdir_path_cases["custom"]);
     BOOST_CHECK(walletdir == expected_path);
 }
 
 BOOST_AUTO_TEST_CASE(walletinit_verify_walletdir_does_not_exist) {
     SetWalletDir(m_walletdir_path_cases["nonexistent"]);
     {
         ASSERT_DEBUG_LOG("does not exist");
-        bool result = m_chain_client->verify(Params());
+        bool result = m_wallet_client->verify(Params());
         BOOST_CHECK(result == false);
     }
 }
 
 BOOST_AUTO_TEST_CASE(walletinit_verify_walletdir_is_not_directory) {
     SetWalletDir(m_walletdir_path_cases["file"]);
     {
         ASSERT_DEBUG_LOG("is not a directory");
-        bool result = m_chain_client->verify(Params());
+        bool result = m_wallet_client->verify(Params());
         BOOST_CHECK(result == false);
     }
 }
 
 BOOST_AUTO_TEST_CASE(walletinit_verify_walletdir_is_not_relative) {
     SetWalletDir(m_walletdir_path_cases["relative"]);
     {
         ASSERT_DEBUG_LOG("is a relative path");
-        bool result = m_chain_client->verify(Params());
+        bool result = m_wallet_client->verify(Params());
         BOOST_CHECK(result == false);
     }
 }
 
 BOOST_AUTO_TEST_CASE(walletinit_verify_walletdir_no_trailing) {
     SetWalletDir(m_walletdir_path_cases["trailing"]);
-    bool result = m_chain_client->verify(Params());
+    bool result = m_wallet_client->verify(Params());
     BOOST_CHECK(result == true);
     fs::path walletdir = gArgs.GetArg("-walletdir", "");
     fs::path expected_path = fs::canonical(m_walletdir_path_cases["default"]);
     BOOST_CHECK(walletdir == expected_path);
 }
 
 BOOST_AUTO_TEST_CASE(walletinit_verify_walletdir_no_trailing2) {
     SetWalletDir(m_walletdir_path_cases["trailing2"]);
-    bool result = m_chain_client->verify(Params());
+    bool result = m_wallet_client->verify(Params());
     BOOST_CHECK(result == true);
     fs::path walletdir = gArgs.GetArg("-walletdir", "");
     fs::path expected_path = fs::canonical(m_walletdir_path_cases["default"]);
     BOOST_CHECK(walletdir == expected_path);
 }
 
 BOOST_AUTO_TEST_SUITE_END()
diff --git a/src/wallet/test/wallet_test_fixture.cpp b/src/wallet/test/wallet_test_fixture.cpp
index 49b0da5af..baac0b006 100644
--- a/src/wallet/test/wallet_test_fixture.cpp
+++ b/src/wallet/test/wallet_test_fixture.cpp
@@ -1,19 +1,19 @@
 // Copyright (c) 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 <wallet/test/wallet_test_fixture.h>
 
 #include <chainparams.h>
 #include <validationinterface.h>
 #include <wallet/rpcdump.h>
 
 WalletTestingSetup::WalletTestingSetup(const std::string &chainName)
     : TestingSetup(chainName), m_chain(interfaces::MakeChain(m_node, Params())),
       m_wallet(m_chain.get(), WalletLocation(), CreateMockWalletDatabase()) {
     bool fFirstRun;
     m_wallet.LoadWallet(fFirstRun);
     m_chain_notifications_handler =
         m_chain->handleNotifications({&m_wallet, [](CWallet *) {}});
-    m_chain_client->registerRpcs();
+    m_wallet_client->registerRpcs();
 }
diff --git a/src/wallet/test/wallet_test_fixture.h b/src/wallet/test/wallet_test_fixture.h
index cab25ea8a..fc9c2916e 100644
--- a/src/wallet/test/wallet_test_fixture.h
+++ b/src/wallet/test/wallet_test_fixture.h
@@ -1,32 +1,32 @@
 // Copyright (c) 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.
 
 #ifndef BITCOIN_WALLET_TEST_WALLET_TEST_FIXTURE_H
 #define BITCOIN_WALLET_TEST_WALLET_TEST_FIXTURE_H
 
 #include <interfaces/chain.h>
 #include <interfaces/wallet.h>
 #include <node/context.h>
 #include <util/check.h>
 #include <wallet/wallet.h>
 
 #include <test/util/setup_common.h>
 
 #include <memory>
 
 /**
  * Testing setup and teardown for wallet.
  */
 struct WalletTestingSetup : public TestingSetup {
     explicit WalletTestingSetup(
         const std::string &chainName = CBaseChainParams::MAIN);
 
     std::unique_ptr<interfaces::Chain> m_chain;
-    std::unique_ptr<interfaces::ChainClient> m_chain_client =
+    std::unique_ptr<interfaces::WalletClient> m_wallet_client =
         interfaces::MakeWalletClient(*m_chain, *Assert(m_node.args), {});
     CWallet m_wallet;
     std::unique_ptr<interfaces::Handler> m_chain_notifications_handler;
 };
 
 #endif // BITCOIN_WALLET_TEST_WALLET_TEST_FIXTURE_H
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 8e3f26c09..196a2d2e6 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -1,5088 +1,5079 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2019 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 <wallet/wallet.h>
 
 #include <chain.h>
 #include <chainparams.h>
 #include <config.h>
 #include <consensus/consensus.h>
 #include <consensus/validation.h>
 #include <fs.h>
 #include <interfaces/wallet.h>
 #include <key.h>
 #include <key_io.h>
 #include <policy/mempool.h>
 #include <policy/policy.h>
 #include <primitives/transaction.h>
 #include <random.h>
 #include <script/descriptor.h>
 #include <script/script.h>
 #include <script/sighashtype.h>
 #include <script/sign.h>
 #include <script/signingprovider.h>
 #include <txmempool.h>
 #include <util/bip32.h>
 #include <util/check.h>
 #include <util/error.h>
 #include <util/moneystr.h>
 #include <util/string.h>
 #include <util/translation.h>
 #include <wallet/coincontrol.h>
 #include <wallet/fees.h>
 
 #include <boost/algorithm/string/replace.hpp>
 
 using interfaces::FoundBlock;
 
 const std::map<uint64_t, std::string> WALLET_FLAG_CAVEATS{
     {WALLET_FLAG_AVOID_REUSE,
      "You need to rescan the blockchain in order to correctly mark used "
      "destinations in the past. Until this is done, some destinations may "
      "be considered unused, even if the opposite is the case."},
 };
 
 static RecursiveMutex cs_wallets;
 static std::vector<std::shared_ptr<CWallet>> vpwallets GUARDED_BY(cs_wallets);
 static std::list<LoadWalletFn> g_load_wallet_fns GUARDED_BY(cs_wallets);
 
 bool AddWallet(const std::shared_ptr<CWallet> &wallet) {
     LOCK(cs_wallets);
     assert(wallet);
     std::vector<std::shared_ptr<CWallet>>::const_iterator i =
         std::find(vpwallets.begin(), vpwallets.end(), wallet);
     if (i != vpwallets.end()) {
         return false;
     }
     vpwallets.push_back(wallet);
     wallet->ConnectScriptPubKeyManNotifiers();
     return true;
 }
 
 bool RemoveWallet(const std::shared_ptr<CWallet> &wallet) {
     assert(wallet);
     // Unregister with the validation interface which also drops shared ponters.
     wallet->m_chain_notifications_handler.reset();
     LOCK(cs_wallets);
     std::vector<std::shared_ptr<CWallet>>::iterator i =
         std::find(vpwallets.begin(), vpwallets.end(), wallet);
     if (i == vpwallets.end()) {
         return false;
     }
     vpwallets.erase(i);
     return true;
 }
 
 std::vector<std::shared_ptr<CWallet>> GetWallets() {
     LOCK(cs_wallets);
     return vpwallets;
 }
 
 std::shared_ptr<CWallet> GetWallet(const std::string &name) {
     LOCK(cs_wallets);
     for (const std::shared_ptr<CWallet> &wallet : vpwallets) {
         if (wallet->GetName() == name) {
             return wallet;
         }
     }
     return nullptr;
 }
 
 std::unique_ptr<interfaces::Handler>
 HandleLoadWallet(LoadWalletFn load_wallet) {
     LOCK(cs_wallets);
     auto it = g_load_wallet_fns.emplace(g_load_wallet_fns.end(),
                                         std::move(load_wallet));
     return interfaces::MakeHandler([it] {
         LOCK(cs_wallets);
         g_load_wallet_fns.erase(it);
     });
 }
 
 static Mutex g_loading_wallet_mutex;
 static Mutex g_wallet_release_mutex;
 static std::condition_variable g_wallet_release_cv;
 static std::set<std::string>
     g_loading_wallet_set GUARDED_BY(g_loading_wallet_mutex);
 static std::set<std::string>
     g_unloading_wallet_set GUARDED_BY(g_wallet_release_mutex);
 
 // Custom deleter for shared_ptr<CWallet>.
 static void ReleaseWallet(CWallet *wallet) {
     const std::string name = wallet->GetName();
     wallet->WalletLogPrintf("Releasing wallet\n");
     wallet->Flush();
     delete wallet;
     // Wallet is now released, notify UnloadWallet, if any.
     {
         LOCK(g_wallet_release_mutex);
         if (g_unloading_wallet_set.erase(name) == 0) {
             // UnloadWallet was not called for this wallet, all done.
             return;
         }
     }
     g_wallet_release_cv.notify_all();
 }
 
 void UnloadWallet(std::shared_ptr<CWallet> &&wallet) {
     // Mark wallet for unloading.
     const std::string name = wallet->GetName();
     {
         LOCK(g_wallet_release_mutex);
         auto it = g_unloading_wallet_set.insert(name);
         assert(it.second);
     }
     // The wallet can be in use so it's not possible to explicitly unload here.
     // Notify the unload intent so that all remaining shared pointers are
     // released.
     wallet->NotifyUnload();
 
     // Time to ditch our shared_ptr and wait for ReleaseWallet call.
     wallet.reset();
     {
         WAIT_LOCK(g_wallet_release_mutex, lock);
         while (g_unloading_wallet_set.count(name) == 1) {
             g_wallet_release_cv.wait(lock);
         }
     }
 }
 
 static const size_t OUTPUT_GROUP_MAX_ENTRIES = 10;
 
 namespace {
 std::shared_ptr<CWallet>
 LoadWalletInternal(const CChainParams &chainParams, interfaces::Chain &chain,
                    const WalletLocation &location, bilingual_str &error,
                    std::vector<bilingual_str> &warnings) {
     try {
         if (!CWallet::Verify(chainParams, chain, location, error, warnings)) {
             error = Untranslated("Wallet file verification failed.") +
                     Untranslated(" ") + error;
             return nullptr;
         }
 
         std::shared_ptr<CWallet> wallet = CWallet::CreateWalletFromFile(
             chainParams, chain, location, error, warnings);
         if (!wallet) {
             error = Untranslated("Wallet loading failed.") + Untranslated(" ") +
                     error;
             return nullptr;
         }
         AddWallet(wallet);
         wallet->postInitProcess();
         return wallet;
     } catch (const std::runtime_error &e) {
         error = Untranslated(e.what());
         return nullptr;
     }
 }
 } // namespace
 
 std::shared_ptr<CWallet> LoadWallet(const CChainParams &chainParams,
                                     interfaces::Chain &chain,
                                     const WalletLocation &location,
                                     bilingual_str &error,
                                     std::vector<bilingual_str> &warnings) {
     auto result =
         WITH_LOCK(g_loading_wallet_mutex,
                   return g_loading_wallet_set.insert(location.GetName()));
     if (!result.second) {
         error = Untranslated("Wallet already being loading.");
         return nullptr;
     }
     auto wallet =
         LoadWalletInternal(chainParams, chain, location, error, warnings);
     WITH_LOCK(g_loading_wallet_mutex, g_loading_wallet_set.erase(result.first));
     return wallet;
 }
 
-std::shared_ptr<CWallet> LoadWallet(const CChainParams &chainParams,
-                                    interfaces::Chain &chain,
-                                    const std::string &name,
-                                    bilingual_str &error,
-                                    std::vector<bilingual_str> &warnings) {
-    return LoadWallet(chainParams, chain, WalletLocation(name), error,
-                      warnings);
-}
-
 WalletCreationStatus CreateWallet(const CChainParams &params,
                                   interfaces::Chain &chain,
                                   const SecureString &passphrase,
                                   uint64_t wallet_creation_flags,
                                   const std::string &name, bilingual_str &error,
                                   std::vector<bilingual_str> &warnings,
                                   std::shared_ptr<CWallet> &result) {
     // Indicate that the wallet is actually supposed to be blank and not just
     // blank to make it encrypted
     bool create_blank = (wallet_creation_flags & WALLET_FLAG_BLANK_WALLET);
 
     // Born encrypted wallets need to be created blank first.
     if (!passphrase.empty()) {
         wallet_creation_flags |= WALLET_FLAG_BLANK_WALLET;
     }
 
     // Check the wallet file location
     WalletLocation location(name);
     if (location.Exists()) {
         error = strprintf(Untranslated("Wallet %s already exists."),
                           location.GetName());
         return WalletCreationStatus::CREATION_FAILED;
     }
 
     // Wallet::Verify will check if we're trying to create a wallet with a
     // duplicate name.
     if (!CWallet::Verify(params, chain, location, error, warnings)) {
         error = Untranslated("Wallet file verification failed.") +
                 Untranslated(" ") + error;
         return WalletCreationStatus::CREATION_FAILED;
     }
 
     // Do not allow a passphrase when private keys are disabled
     if (!passphrase.empty() &&
         (wallet_creation_flags & WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {
         error = Untranslated(
             "Passphrase provided but private keys are disabled. A passphrase "
             "is only used to encrypt private keys, so cannot be used for "
             "wallets with private keys disabled.");
         return WalletCreationStatus::CREATION_FAILED;
     }
 
     // Make the wallet
     std::shared_ptr<CWallet> wallet = CWallet::CreateWalletFromFile(
         params, chain, location, error, warnings, wallet_creation_flags);
     if (!wallet) {
         error =
             Untranslated("Wallet creation failed.") + Untranslated(" ") + error;
         return WalletCreationStatus::CREATION_FAILED;
     }
 
     // Encrypt the wallet
     if (!passphrase.empty() &&
         !(wallet_creation_flags & WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {
         if (!wallet->EncryptWallet(passphrase)) {
             error =
                 Untranslated("Error: Wallet created but failed to encrypt.");
             return WalletCreationStatus::ENCRYPTION_FAILED;
         }
         if (!create_blank) {
             // Unlock the wallet
             if (!wallet->Unlock(passphrase)) {
                 error = Untranslated(
                     "Error: Wallet was encrypted but could not be unlocked");
                 return WalletCreationStatus::ENCRYPTION_FAILED;
             }
 
             // Set a seed for the wallet
             {
                 LOCK(wallet->cs_wallet);
                 if (wallet->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS)) {
                     wallet->SetupDescriptorScriptPubKeyMans();
                 } else {
                     for (auto spk_man : wallet->GetActiveScriptPubKeyMans()) {
                         if (!spk_man->SetupGeneration()) {
                             error =
                                 Untranslated("Unable to generate initial keys");
                             return WalletCreationStatus::CREATION_FAILED;
                         }
                     }
                 }
             }
 
             // Relock the wallet
             wallet->Lock();
         }
     }
     AddWallet(wallet);
     wallet->postInitProcess();
     result = wallet;
     return WalletCreationStatus::SUCCESS;
 }
 
 /** @defgroup mapWallet
  *
  * @{
  */
 
 std::string COutput::ToString() const {
     return strprintf("COutput(%s, %d, %d) [%s]", tx->GetId().ToString(), i,
                      nDepth, FormatMoney(tx->tx->vout[i].nValue));
 }
 
 const CChainParams &CWallet::GetChainParams() const {
     // Get CChainParams from interfaces::Chain, unless wallet doesn't have a
     // chain (i.e. bitcoin-wallet), in which case return global Params()
     return m_chain ? m_chain->params() : Params();
 }
 
 const CWalletTx *CWallet::GetWalletTx(const TxId &txid) const {
     AssertLockHeld(cs_wallet);
     std::map<TxId, CWalletTx>::const_iterator it = mapWallet.find(txid);
     if (it == mapWallet.end()) {
         return nullptr;
     }
 
     return &(it->second);
 }
 
 void CWallet::UpgradeKeyMetadata() {
     if (IsLocked() || IsWalletFlagSet(WALLET_FLAG_KEY_ORIGIN_METADATA)) {
         return;
     }
 
     auto spk_man = GetLegacyScriptPubKeyMan();
     if (!spk_man) {
         return;
     }
 
     spk_man->UpgradeKeyMetadata();
     SetWalletFlag(WALLET_FLAG_KEY_ORIGIN_METADATA);
 }
 
 bool CWallet::Unlock(const SecureString &strWalletPassphrase,
                      bool accept_no_keys) {
     CCrypter crypter;
     CKeyingMaterial _vMasterKey;
 
     {
         LOCK(cs_wallet);
         for (const MasterKeyMap::value_type &pMasterKey : mapMasterKeys) {
             if (!crypter.SetKeyFromPassphrase(
                     strWalletPassphrase, pMasterKey.second.vchSalt,
                     pMasterKey.second.nDeriveIterations,
                     pMasterKey.second.nDerivationMethod)) {
                 return false;
             }
             if (!crypter.Decrypt(pMasterKey.second.vchCryptedKey,
                                  _vMasterKey)) {
                 // try another master key
                 continue;
             }
             if (Unlock(_vMasterKey, accept_no_keys)) {
                 // Now that we've unlocked, upgrade the key metadata
                 UpgradeKeyMetadata();
                 return true;
             }
         }
     }
 
     return false;
 }
 
 bool CWallet::ChangeWalletPassphrase(
     const SecureString &strOldWalletPassphrase,
     const SecureString &strNewWalletPassphrase) {
     bool fWasLocked = IsLocked();
 
     LOCK(cs_wallet);
     Lock();
 
     CCrypter crypter;
     CKeyingMaterial _vMasterKey;
     for (MasterKeyMap::value_type &pMasterKey : mapMasterKeys) {
         if (!crypter.SetKeyFromPassphrase(
                 strOldWalletPassphrase, pMasterKey.second.vchSalt,
                 pMasterKey.second.nDeriveIterations,
                 pMasterKey.second.nDerivationMethod)) {
             return false;
         }
 
         if (!crypter.Decrypt(pMasterKey.second.vchCryptedKey, _vMasterKey)) {
             return false;
         }
 
         if (Unlock(_vMasterKey)) {
             int64_t nStartTime = GetTimeMillis();
             crypter.SetKeyFromPassphrase(strNewWalletPassphrase,
                                          pMasterKey.second.vchSalt,
                                          pMasterKey.second.nDeriveIterations,
                                          pMasterKey.second.nDerivationMethod);
             pMasterKey.second.nDeriveIterations = static_cast<unsigned int>(
                 pMasterKey.second.nDeriveIterations *
                 (100 / ((double)(GetTimeMillis() - nStartTime))));
 
             nStartTime = GetTimeMillis();
             crypter.SetKeyFromPassphrase(strNewWalletPassphrase,
                                          pMasterKey.second.vchSalt,
                                          pMasterKey.second.nDeriveIterations,
                                          pMasterKey.second.nDerivationMethod);
             pMasterKey.second.nDeriveIterations =
                 (pMasterKey.second.nDeriveIterations +
                  static_cast<unsigned int>(
                      pMasterKey.second.nDeriveIterations * 100 /
                      double(GetTimeMillis() - nStartTime))) /
                 2;
 
             if (pMasterKey.second.nDeriveIterations < 25000) {
                 pMasterKey.second.nDeriveIterations = 25000;
             }
 
             WalletLogPrintf(
                 "Wallet passphrase changed to an nDeriveIterations of %i\n",
                 pMasterKey.second.nDeriveIterations);
 
             if (!crypter.SetKeyFromPassphrase(
                     strNewWalletPassphrase, pMasterKey.second.vchSalt,
                     pMasterKey.second.nDeriveIterations,
                     pMasterKey.second.nDerivationMethod)) {
                 return false;
             }
 
             if (!crypter.Encrypt(_vMasterKey,
                                  pMasterKey.second.vchCryptedKey)) {
                 return false;
             }
 
             WalletBatch(*database).WriteMasterKey(pMasterKey.first,
                                                   pMasterKey.second);
             if (fWasLocked) {
                 Lock();
             }
 
             return true;
         }
     }
 
     return false;
 }
 
 void CWallet::chainStateFlushed(const CBlockLocator &loc) {
     WalletBatch batch(*database);
     batch.WriteBestBlock(loc);
 }
 
 void CWallet::SetMinVersion(enum WalletFeature nVersion, WalletBatch *batch_in,
                             bool fExplicit) {
     LOCK(cs_wallet);
     if (nWalletVersion >= nVersion) {
         return;
     }
 
     // When doing an explicit upgrade, if we pass the max version permitted,
     // upgrade all the way.
     if (fExplicit && nVersion > nWalletMaxVersion) {
         nVersion = FEATURE_LATEST;
     }
 
     nWalletVersion = nVersion;
 
     if (nVersion > nWalletMaxVersion) {
         nWalletMaxVersion = nVersion;
     }
 
     WalletBatch *batch = batch_in ? batch_in : new WalletBatch(*database);
     if (nWalletVersion > 40000) {
         batch->WriteMinVersion(nWalletVersion);
     }
     if (!batch_in) {
         delete batch;
     }
 }
 
 bool CWallet::SetMaxVersion(int nVersion) {
     LOCK(cs_wallet);
 
     // Cannot downgrade below current version
     if (nWalletVersion > nVersion) {
         return false;
     }
 
     nWalletMaxVersion = nVersion;
 
     return true;
 }
 
 std::set<TxId> CWallet::GetConflicts(const TxId &txid) const {
     std::set<TxId> result;
     AssertLockHeld(cs_wallet);
 
     std::map<TxId, CWalletTx>::const_iterator it = mapWallet.find(txid);
     if (it == mapWallet.end()) {
         return result;
     }
 
     const CWalletTx &wtx = it->second;
 
     std::pair<TxSpends::const_iterator, TxSpends::const_iterator> range;
 
     for (const CTxIn &txin : wtx.tx->vin) {
         if (mapTxSpends.count(txin.prevout) <= 1) {
             // No conflict if zero or one spends.
             continue;
         }
 
         range = mapTxSpends.equal_range(txin.prevout);
         for (TxSpends::const_iterator _it = range.first; _it != range.second;
              ++_it) {
             result.insert(_it->second);
         }
     }
 
     return result;
 }
 
 bool CWallet::HasWalletSpend(const TxId &txid) const {
     AssertLockHeld(cs_wallet);
     auto iter = mapTxSpends.lower_bound(COutPoint(txid, 0));
     return (iter != mapTxSpends.end() && iter->first.GetTxId() == txid);
 }
 
 void CWallet::Flush() {
     database->Flush();
 }
 
 void CWallet::Close() {
     database->Close();
 }
 
 void CWallet::SyncMetaData(
     std::pair<TxSpends::iterator, TxSpends::iterator> range) {
     // We want all the wallet transactions in range to have the same metadata as
     // the oldest (smallest nOrderPos).
     // So: find smallest nOrderPos:
 
     int nMinOrderPos = std::numeric_limits<int>::max();
     const CWalletTx *copyFrom = nullptr;
     for (TxSpends::iterator it = range.first; it != range.second; ++it) {
         const CWalletTx *wtx = &mapWallet.at(it->second);
         if (wtx->nOrderPos < nMinOrderPos) {
             nMinOrderPos = wtx->nOrderPos;
             copyFrom = wtx;
         }
     }
 
     if (!copyFrom) {
         return;
     }
 
     // Now copy data from copyFrom to rest:
     for (TxSpends::iterator it = range.first; it != range.second; ++it) {
         const TxId &txid = it->second;
         CWalletTx *copyTo = &mapWallet.at(txid);
         if (copyFrom == copyTo) {
             continue;
         }
 
         assert(
             copyFrom &&
             "Oldest wallet transaction in range assumed to have been found.");
 
         if (!copyFrom->IsEquivalentTo(*copyTo)) {
             continue;
         }
 
         copyTo->mapValue = copyFrom->mapValue;
         copyTo->vOrderForm = copyFrom->vOrderForm;
         // fTimeReceivedIsTxTime not copied on purpose nTimeReceived not copied
         // on purpose.
         copyTo->nTimeSmart = copyFrom->nTimeSmart;
         copyTo->fFromMe = copyFrom->fFromMe;
         // nOrderPos not copied on purpose cached members not copied on purpose.
     }
 }
 
 /**
  * Outpoint is spent if any non-conflicted transaction, spends it:
  */
 bool CWallet::IsSpent(const COutPoint &outpoint) const {
     std::pair<TxSpends::const_iterator, TxSpends::const_iterator> range =
         mapTxSpends.equal_range(outpoint);
 
     for (TxSpends::const_iterator it = range.first; it != range.second; ++it) {
         const TxId &wtxid = it->second;
         std::map<TxId, CWalletTx>::const_iterator mit = mapWallet.find(wtxid);
         if (mit != mapWallet.end()) {
             int depth = mit->second.GetDepthInMainChain();
             if (depth > 0 || (depth == 0 && !mit->second.isAbandoned())) {
                 // Spent
                 return true;
             }
         }
     }
 
     return false;
 }
 
 void CWallet::AddToSpends(const COutPoint &outpoint, const TxId &wtxid) {
     mapTxSpends.insert(std::make_pair(outpoint, wtxid));
 
     setLockedCoins.erase(outpoint);
 
     std::pair<TxSpends::iterator, TxSpends::iterator> range;
     range = mapTxSpends.equal_range(outpoint);
     SyncMetaData(range);
 }
 
 void CWallet::AddToSpends(const TxId &wtxid) {
     auto it = mapWallet.find(wtxid);
     assert(it != mapWallet.end());
     CWalletTx &thisTx = it->second;
     // Coinbases don't spend anything!
     if (thisTx.IsCoinBase()) {
         return;
     }
 
     for (const CTxIn &txin : thisTx.tx->vin) {
         AddToSpends(txin.prevout, wtxid);
     }
 }
 
 bool CWallet::EncryptWallet(const SecureString &strWalletPassphrase) {
     if (IsCrypted()) {
         return false;
     }
 
     CKeyingMaterial _vMasterKey;
 
     _vMasterKey.resize(WALLET_CRYPTO_KEY_SIZE);
     GetStrongRandBytes(&_vMasterKey[0], WALLET_CRYPTO_KEY_SIZE);
 
     CMasterKey kMasterKey;
 
     kMasterKey.vchSalt.resize(WALLET_CRYPTO_SALT_SIZE);
     GetStrongRandBytes(&kMasterKey.vchSalt[0], WALLET_CRYPTO_SALT_SIZE);
 
     CCrypter crypter;
     int64_t nStartTime = GetTimeMillis();
     crypter.SetKeyFromPassphrase(strWalletPassphrase, kMasterKey.vchSalt, 25000,
                                  kMasterKey.nDerivationMethod);
     kMasterKey.nDeriveIterations = static_cast<unsigned int>(
         2500000 / double(GetTimeMillis() - nStartTime));
 
     nStartTime = GetTimeMillis();
     crypter.SetKeyFromPassphrase(strWalletPassphrase, kMasterKey.vchSalt,
                                  kMasterKey.nDeriveIterations,
                                  kMasterKey.nDerivationMethod);
     kMasterKey.nDeriveIterations =
         (kMasterKey.nDeriveIterations +
          static_cast<unsigned int>(kMasterKey.nDeriveIterations * 100 /
                                    double(GetTimeMillis() - nStartTime))) /
         2;
 
     if (kMasterKey.nDeriveIterations < 25000) {
         kMasterKey.nDeriveIterations = 25000;
     }
 
     WalletLogPrintf("Encrypting Wallet with an nDeriveIterations of %i\n",
                     kMasterKey.nDeriveIterations);
 
     if (!crypter.SetKeyFromPassphrase(strWalletPassphrase, kMasterKey.vchSalt,
                                       kMasterKey.nDeriveIterations,
                                       kMasterKey.nDerivationMethod)) {
         return false;
     }
 
     if (!crypter.Encrypt(_vMasterKey, kMasterKey.vchCryptedKey)) {
         return false;
     }
 
     {
         LOCK(cs_wallet);
         mapMasterKeys[++nMasterKeyMaxID] = kMasterKey;
         WalletBatch *encrypted_batch = new WalletBatch(*database);
         if (!encrypted_batch->TxnBegin()) {
             delete encrypted_batch;
             encrypted_batch = nullptr;
             return false;
         }
         encrypted_batch->WriteMasterKey(nMasterKeyMaxID, kMasterKey);
 
         for (const auto &spk_man_pair : m_spk_managers) {
             auto spk_man = spk_man_pair.second.get();
             if (!spk_man->Encrypt(_vMasterKey, encrypted_batch)) {
                 encrypted_batch->TxnAbort();
                 delete encrypted_batch;
                 encrypted_batch = nullptr;
                 // We now probably have half of our keys encrypted in memory,
                 // and half not... die and let the user reload the unencrypted
                 // wallet.
                 assert(false);
             }
         }
 
         // Encryption was introduced in version 0.4.0
         SetMinVersion(FEATURE_WALLETCRYPT, encrypted_batch, true);
 
         if (!encrypted_batch->TxnCommit()) {
             delete encrypted_batch;
             encrypted_batch = nullptr;
             // We now have keys encrypted in memory, but not on disk...
             // die to avoid confusion and let the user reload the unencrypted
             // wallet.
             assert(false);
         }
 
         delete encrypted_batch;
         encrypted_batch = nullptr;
 
         Lock();
         Unlock(strWalletPassphrase);
 
         // If we are using descriptors, make new descriptors with a new seed
         if (IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS) &&
             !IsWalletFlagSet(WALLET_FLAG_BLANK_WALLET)) {
             SetupDescriptorScriptPubKeyMans();
         } else if (auto spk_man = GetLegacyScriptPubKeyMan()) {
             // if we are using HD, replace the HD seed with a new one
             if (spk_man->IsHDEnabled()) {
                 if (!spk_man->SetupGeneration(true)) {
                     return false;
                 }
             }
         }
         Lock();
 
         // Need to completely rewrite the wallet file; if we don't, bdb might
         // keep bits of the unencrypted private key in slack space in the
         // database file.
         database->Rewrite();
 
         // BDB seems to have a bad habit of writing old data into
         // slack space in .dat files; that is bad if the old data is
         // unencrypted private keys. So:
         database->ReloadDbEnv();
     }
 
     NotifyStatusChanged(this);
     return true;
 }
 
 DBErrors CWallet::ReorderTransactions() {
     LOCK(cs_wallet);
     WalletBatch batch(*database);
 
     // Old wallets didn't have any defined order for transactions. Probably a
     // bad idea to change the output of this.
 
     // First: get all CWalletTx into a sorted-by-time
     // multimap.
     TxItems txByTime;
 
     for (auto &entry : mapWallet) {
         CWalletTx *wtx = &entry.second;
         txByTime.insert(std::make_pair(wtx->nTimeReceived, wtx));
     }
 
     nOrderPosNext = 0;
     std::vector<int64_t> nOrderPosOffsets;
     for (TxItems::iterator it = txByTime.begin(); it != txByTime.end(); ++it) {
         CWalletTx *const pwtx = (*it).second;
         int64_t &nOrderPos = pwtx->nOrderPos;
 
         if (nOrderPos == -1) {
             nOrderPos = nOrderPosNext++;
             nOrderPosOffsets.push_back(nOrderPos);
 
             if (!batch.WriteTx(*pwtx)) {
                 return DBErrors::LOAD_FAIL;
             }
         } else {
             int64_t nOrderPosOff = 0;
             for (const int64_t &nOffsetStart : nOrderPosOffsets) {
                 if (nOrderPos >= nOffsetStart) {
                     ++nOrderPosOff;
                 }
             }
 
             nOrderPos += nOrderPosOff;
             nOrderPosNext = std::max(nOrderPosNext, nOrderPos + 1);
 
             if (!nOrderPosOff) {
                 continue;
             }
 
             // Since we're changing the order, write it back.
             if (!batch.WriteTx(*pwtx)) {
                 return DBErrors::LOAD_FAIL;
             }
         }
     }
 
     batch.WriteOrderPosNext(nOrderPosNext);
 
     return DBErrors::LOAD_OK;
 }
 
 int64_t CWallet::IncOrderPosNext(WalletBatch *batch) {
     AssertLockHeld(cs_wallet);
     int64_t nRet = nOrderPosNext++;
     if (batch) {
         batch->WriteOrderPosNext(nOrderPosNext);
     } else {
         WalletBatch(*database).WriteOrderPosNext(nOrderPosNext);
     }
 
     return nRet;
 }
 
 void CWallet::MarkDirty() {
     LOCK(cs_wallet);
     for (std::pair<const TxId, CWalletTx> &item : mapWallet) {
         item.second.MarkDirty();
     }
 }
 
 void CWallet::SetSpentKeyState(WalletBatch &batch, const TxId &txid,
                                unsigned int n, bool used,
                                std::set<CTxDestination> &tx_destinations) {
     AssertLockHeld(cs_wallet);
     const CWalletTx *srctx = GetWalletTx(txid);
     if (!srctx) {
         return;
     }
 
     CTxDestination dst;
     if (ExtractDestination(srctx->tx->vout[n].scriptPubKey, dst)) {
         if (IsMine(dst)) {
             if (used && !GetDestData(dst, "used", nullptr)) {
                 // p for "present", opposite of absent (null)
                 if (AddDestData(batch, dst, "used", "p")) {
                     tx_destinations.insert(dst);
                 }
             } else if (!used && GetDestData(dst, "used", nullptr)) {
                 EraseDestData(batch, dst, "used");
             }
         }
     }
 }
 
 bool CWallet::IsSpentKey(const TxId &txid, unsigned int n) const {
     AssertLockHeld(cs_wallet);
     const CWalletTx *srctx = GetWalletTx(txid);
     if (srctx) {
         assert(srctx->tx->vout.size() > n);
         CTxDestination dest;
         if (!ExtractDestination(srctx->tx->vout[n].scriptPubKey, dest)) {
             return false;
         }
         if (GetDestData(dest, "used", nullptr)) {
             return true;
         }
         if (IsLegacy()) {
             LegacyScriptPubKeyMan *spk_man = GetLegacyScriptPubKeyMan();
             assert(spk_man != nullptr);
             for (const auto &keyid :
                  GetAffectedKeys(srctx->tx->vout[n].scriptPubKey, *spk_man)) {
                 PKHash pkh_dest(keyid);
                 if (GetDestData(pkh_dest, "used", nullptr)) {
                     return true;
                 }
             }
         }
     }
     return false;
 }
 
 CWalletTx *CWallet::AddToWallet(CTransactionRef tx,
                                 const CWalletTx::Confirmation &confirm,
                                 const UpdateWalletTxFn &update_wtx,
                                 bool fFlushOnClose) {
     LOCK(cs_wallet);
 
     WalletBatch batch(*database, "r+", fFlushOnClose);
 
     const TxId &txid = tx->GetId();
 
     if (IsWalletFlagSet(WALLET_FLAG_AVOID_REUSE)) {
         // Mark used destinations
         std::set<CTxDestination> tx_destinations;
 
         for (const CTxIn &txin : tx->vin) {
             const COutPoint &op = txin.prevout;
             SetSpentKeyState(batch, op.GetTxId(), op.GetN(), true,
                              tx_destinations);
         }
 
         MarkDestinationsDirty(tx_destinations);
     }
 
     // Inserts only if not already there, returns tx inserted or tx found.
     auto ret =
         mapWallet.emplace(std::piecewise_construct, std::forward_as_tuple(txid),
                           std::forward_as_tuple(this, tx));
     CWalletTx &wtx = (*ret.first).second;
     bool fInsertedNew = ret.second;
     bool fUpdated = update_wtx && update_wtx(wtx, fInsertedNew);
     if (fInsertedNew) {
         wtx.m_confirm = confirm;
         wtx.nTimeReceived = chain().getAdjustedTime();
         wtx.nOrderPos = IncOrderPosNext(&batch);
         wtx.m_it_wtxOrdered =
             wtxOrdered.insert(std::make_pair(wtx.nOrderPos, &wtx));
         wtx.nTimeSmart = ComputeTimeSmart(wtx);
         AddToSpends(txid);
     }
 
     if (!fInsertedNew) {
         if (confirm.status != wtx.m_confirm.status) {
             wtx.m_confirm.status = confirm.status;
             wtx.m_confirm.nIndex = confirm.nIndex;
             wtx.m_confirm.hashBlock = confirm.hashBlock;
             wtx.m_confirm.block_height = confirm.block_height;
             fUpdated = true;
         } else {
             assert(wtx.m_confirm.nIndex == confirm.nIndex);
             assert(wtx.m_confirm.hashBlock == confirm.hashBlock);
             assert(wtx.m_confirm.block_height == confirm.block_height);
         }
     }
 
     //// debug print
     WalletLogPrintf("AddToWallet %s  %s%s\n", txid.ToString(),
                     (fInsertedNew ? "new" : ""), (fUpdated ? "update" : ""));
 
     // Write to disk
     if ((fInsertedNew || fUpdated) && !batch.WriteTx(wtx)) {
         return nullptr;
     }
 
     // Break debit/credit balance caches:
     wtx.MarkDirty();
 
     // Notify UI of new or updated transaction.
     NotifyTransactionChanged(this, txid, fInsertedNew ? CT_NEW : CT_UPDATED);
 
 #if defined(HAVE_SYSTEM)
     // Notify an external script when a wallet transaction comes in or is
     // updated.
     std::string strCmd = gArgs.GetArg("-walletnotify", "");
 
     if (!strCmd.empty()) {
         boost::replace_all(strCmd, "%s", txid.GetHex());
 #ifndef WIN32
         // Substituting the wallet name isn't currently supported on windows
         // because windows shell escaping has not been implemented yet:
         // https://github.com/bitcoin/bitcoin/pull/13339#issuecomment-537384875
         // A few ways it could be implemented in the future are described in:
         // https://github.com/bitcoin/bitcoin/pull/13339#issuecomment-461288094
         boost::replace_all(strCmd, "%w", ShellEscape(GetName()));
 #endif
 
         std::thread t(runCommand, strCmd);
         // Thread runs free.
         t.detach();
     }
 #endif
 
     return &wtx;
 }
 
 bool CWallet::LoadToWallet(const TxId &txid, const UpdateWalletTxFn &fill_wtx) {
     const auto &ins =
         mapWallet.emplace(std::piecewise_construct, std::forward_as_tuple(txid),
                           std::forward_as_tuple(this, nullptr));
     CWalletTx &wtx = ins.first->second;
     if (!fill_wtx(wtx, ins.second)) {
         return false;
     }
     // If wallet doesn't have a chain (e.g wallet-tool), don't bother to update
     // txn.
     if (HaveChain()) {
         std::optional<int> block_height =
             chain().getBlockHeight(wtx.m_confirm.hashBlock);
         if (block_height) {
             // Update cached block height variable since it not stored in the
             // serialized transaction.
             wtx.m_confirm.block_height = *block_height;
         } else if (wtx.isConflicted() || wtx.isConfirmed()) {
             // If tx block (or conflicting block) was reorged out of chain
             // while the wallet was shutdown, change tx status to UNCONFIRMED
             // and reset block height, hash, and index. ABANDONED tx don't have
             // associated blocks and don't need to be updated. The case where a
             // transaction was reorged out while online and then reconfirmed
             // while offline is covered by the rescan logic.
             wtx.setUnconfirmed();
             wtx.m_confirm.hashBlock = BlockHash();
             wtx.m_confirm.block_height = 0;
             wtx.m_confirm.nIndex = 0;
         }
     }
     if (/* insertion took place */ ins.second) {
         wtx.m_it_wtxOrdered =
             wtxOrdered.insert(std::make_pair(wtx.nOrderPos, &wtx));
     }
     AddToSpends(txid);
     for (const CTxIn &txin : wtx.tx->vin) {
         auto it = mapWallet.find(txin.prevout.GetTxId());
         if (it != mapWallet.end()) {
             CWalletTx &prevtx = it->second;
             if (prevtx.isConflicted()) {
                 MarkConflicted(prevtx.m_confirm.hashBlock,
                                prevtx.m_confirm.block_height, wtx.GetId());
             }
         }
     }
     return true;
 }
 
 bool CWallet::AddToWalletIfInvolvingMe(const CTransactionRef &ptx,
                                        CWalletTx::Confirmation confirm,
                                        bool fUpdate) {
     const CTransaction &tx = *ptx;
     AssertLockHeld(cs_wallet);
 
     if (!confirm.hashBlock.IsNull()) {
         for (const CTxIn &txin : tx.vin) {
             std::pair<TxSpends::const_iterator, TxSpends::const_iterator>
                 range = mapTxSpends.equal_range(txin.prevout);
             while (range.first != range.second) {
                 if (range.first->second != tx.GetId()) {
                     WalletLogPrintf(
                         "Transaction %s (in block %s) conflicts with wallet "
                         "transaction %s (both spend %s:%i)\n",
                         tx.GetId().ToString(), confirm.hashBlock.ToString(),
                         range.first->second.ToString(),
                         range.first->first.GetTxId().ToString(),
                         range.first->first.GetN());
                     MarkConflicted(confirm.hashBlock, confirm.block_height,
                                    range.first->second);
                 }
                 range.first++;
             }
         }
     }
 
     bool fExisted = mapWallet.count(tx.GetId()) != 0;
     if (fExisted && !fUpdate) {
         return false;
     }
     if (fExisted || IsMine(tx) || IsFromMe(tx)) {
         /**
          * Check if any keys in the wallet keypool that were supposed to be
          * unused have appeared in a new transaction. If so, remove those keys
          * from the keypool. This can happen when restoring an old wallet backup
          * that does not contain the mostly recently created transactions from
          * newer versions of the wallet.
          */
 
         // loop though all outputs
         for (const CTxOut &txout : tx.vout) {
             for (const auto &spk_man_pair : m_spk_managers) {
                 spk_man_pair.second->MarkUnusedAddresses(txout.scriptPubKey);
             }
         }
 
         // Block disconnection override an abandoned tx as unconfirmed
         // which means user may have to call abandontransaction again
         return AddToWallet(MakeTransactionRef(tx), confirm,
                            /* update_wtx= */ nullptr,
                            /* fFlushOnClose= */ false);
     }
     return false;
 }
 
 bool CWallet::TransactionCanBeAbandoned(const TxId &txid) const {
     LOCK(cs_wallet);
     const CWalletTx *wtx = GetWalletTx(txid);
     return wtx && !wtx->isAbandoned() && wtx->GetDepthInMainChain() == 0 &&
            !wtx->InMempool();
 }
 
 void CWallet::MarkInputsDirty(const CTransactionRef &tx) {
     for (const CTxIn &txin : tx->vin) {
         auto it = mapWallet.find(txin.prevout.GetTxId());
         if (it != mapWallet.end()) {
             it->second.MarkDirty();
         }
     }
 }
 
 bool CWallet::AbandonTransaction(const TxId &txid) {
     LOCK(cs_wallet);
 
     WalletBatch batch(*database, "r+");
 
     std::set<TxId> todo;
     std::set<TxId> done;
 
     // Can't mark abandoned if confirmed or in mempool
     auto it = mapWallet.find(txid);
     assert(it != mapWallet.end());
     CWalletTx &origtx = it->second;
     if (origtx.GetDepthInMainChain() != 0 || origtx.InMempool()) {
         return false;
     }
 
     todo.insert(txid);
 
     while (!todo.empty()) {
         const TxId now = *todo.begin();
         todo.erase(now);
         done.insert(now);
         it = mapWallet.find(now);
         assert(it != mapWallet.end());
         CWalletTx &wtx = it->second;
         int currentconfirm = wtx.GetDepthInMainChain();
         // If the orig tx was not in block, none of its spends can be.
         assert(currentconfirm <= 0);
         // If (currentconfirm < 0) {Tx and spends are already conflicted, no
         // need to abandon}
         if (currentconfirm == 0 && !wtx.isAbandoned()) {
             // If the orig tx was not in block/mempool, none of its spends can
             // be in mempool.
             assert(!wtx.InMempool());
             wtx.setAbandoned();
             wtx.MarkDirty();
             batch.WriteTx(wtx);
             NotifyTransactionChanged(this, wtx.GetId(), CT_UPDATED);
             // Iterate over all its outputs, and mark transactions in the wallet
             // that spend them abandoned too.
             TxSpends::const_iterator iter =
                 mapTxSpends.lower_bound(COutPoint(now, 0));
             while (iter != mapTxSpends.end() && iter->first.GetTxId() == now) {
                 if (!done.count(iter->second)) {
                     todo.insert(iter->second);
                 }
                 iter++;
             }
 
             // If a transaction changes 'conflicted' state, that changes the
             // balance available of the outputs it spends. So force those to be
             // recomputed.
             MarkInputsDirty(wtx.tx);
         }
     }
 
     return true;
 }
 
 void CWallet::MarkConflicted(const BlockHash &hashBlock, int conflicting_height,
                              const TxId &txid) {
     LOCK(cs_wallet);
 
     int conflictconfirms =
         (m_last_block_processed_height - conflicting_height + 1) * -1;
 
     // If number of conflict confirms cannot be determined, this means that the
     // block is still unknown or not yet part of the main chain, for example
     // when loading the wallet during a reindex. Do nothing in that case.
     if (conflictconfirms >= 0) {
         return;
     }
 
     // Do not flush the wallet here for performance reasons.
     WalletBatch batch(*database, "r+", false);
 
     std::set<TxId> todo;
     std::set<TxId> done;
 
     todo.insert(txid);
 
     while (!todo.empty()) {
         const TxId now = *todo.begin();
         todo.erase(now);
         done.insert(now);
         auto it = mapWallet.find(now);
         assert(it != mapWallet.end());
         CWalletTx &wtx = it->second;
         int currentconfirm = wtx.GetDepthInMainChain();
         if (conflictconfirms < currentconfirm) {
             // Block is 'more conflicted' than current confirm; update.
             // Mark transaction as conflicted with this block.
             wtx.m_confirm.nIndex = 0;
             wtx.m_confirm.hashBlock = hashBlock;
             wtx.m_confirm.block_height = conflicting_height;
             wtx.setConflicted();
             wtx.MarkDirty();
             batch.WriteTx(wtx);
             // Iterate over all its outputs, and mark transactions in the wallet
             // that spend them conflicted too.
             TxSpends::const_iterator iter =
                 mapTxSpends.lower_bound(COutPoint(now, 0));
             while (iter != mapTxSpends.end() && iter->first.GetTxId() == now) {
                 if (!done.count(iter->second)) {
                     todo.insert(iter->second);
                 }
                 iter++;
             }
             // If a transaction changes 'conflicted' state, that changes the
             // balance available of the outputs it spends. So force those to be
             // recomputed.
             MarkInputsDirty(wtx.tx);
         }
     }
 }
 
 void CWallet::SyncTransaction(const CTransactionRef &ptx,
                               CWalletTx::Confirmation confirm, bool update_tx) {
     if (!AddToWalletIfInvolvingMe(ptx, confirm, update_tx)) {
         // Not one of ours
         return;
     }
 
     // If a transaction changes 'conflicted' state, that changes the balance
     // available of the outputs it spends. So force those to be
     // recomputed, also:
     MarkInputsDirty(ptx);
 }
 
 void CWallet::transactionAddedToMempool(const CTransactionRef &tx) {
     LOCK(cs_wallet);
 
     SyncTransaction(tx, {CWalletTx::Status::UNCONFIRMED, /* block_height */ 0,
                          BlockHash(), /* nIndex */ 0});
 
     auto it = mapWallet.find(tx->GetId());
     if (it != mapWallet.end()) {
         it->second.fInMempool = true;
     }
 }
 
 void CWallet::transactionRemovedFromMempool(const CTransactionRef &tx,
                                             MemPoolRemovalReason reason) {
     LOCK(cs_wallet);
     auto it = mapWallet.find(tx->GetId());
     if (it != mapWallet.end()) {
         it->second.fInMempool = false;
     }
     // Handle transactions that were removed from the mempool because they
     // conflict with transactions in a newly connected block.
     if (reason == MemPoolRemovalReason::CONFLICT) {
         // Call SyncNotifications, so external -walletnotify notifications will
         // be triggered for these transactions. Set Status::UNCONFIRMED instead
         // of Status::CONFLICTED for a few reasons:
         //
         // 1. The transactionRemovedFromMempool callback does not currently
         //    provide the conflicting block's hash and height, and for backwards
         //    compatibility reasons it may not be not safe to store conflicted
         //    wallet transactions with a null block hash. See
         //    https://github.com/bitcoin/bitcoin/pull/18600#discussion_r420195993.
         // 2. For most of these transactions, the wallet's internal conflict
         //    detection in the blockConnected handler will subsequently call
         //    MarkConflicted and update them with CONFLICTED status anyway. This
         //    applies to any wallet transaction that has inputs spent in the
         //    block, or that has ancestors in the wallet with inputs spent by
         //    the block.
         // 3. Longstanding behavior since the sync implementation in
         //    https://github.com/bitcoin/bitcoin/pull/9371 and the prior sync
         //    implementation before that was to mark these transactions
         //    unconfirmed rather than conflicted.
         //
         // Nothing described above should be seen as an unchangeable requirement
         // when improving this code in the future. The wallet's heuristics for
         // distinguishing between conflicted and unconfirmed transactions are
         // imperfect, and could be improved in general, see
         // https://github.com/bitcoin-core/bitcoin-devwiki/wiki/Wallet-Transaction-Conflict-Tracking
         SyncTransaction(tx,
                         {CWalletTx::Status::UNCONFIRMED, /* block height  */ 0,
                          BlockHash(), /* index */ 0});
     }
 }
 
 void CWallet::blockConnected(const CBlock &block, int height) {
     const BlockHash &block_hash = block.GetHash();
     LOCK(cs_wallet);
 
     m_last_block_processed_height = height;
     m_last_block_processed = block_hash;
     for (size_t index = 0; index < block.vtx.size(); index++) {
         SyncTransaction(block.vtx[index], {CWalletTx::Status::CONFIRMED, height,
                                            block_hash, int(index)});
         transactionRemovedFromMempool(block.vtx[index],
                                       MemPoolRemovalReason::BLOCK);
     }
 }
 
 void CWallet::blockDisconnected(const CBlock &block, int height) {
     LOCK(cs_wallet);
 
     // At block disconnection, this will change an abandoned transaction to
     // be unconfirmed, whether or not the transaction is added back to the
     // mempool. User may have to call abandontransaction again. It may be
     // addressed in the future with a stickier abandoned state or even removing
     // abandontransaction call.
     m_last_block_processed_height = height - 1;
     m_last_block_processed = block.hashPrevBlock;
     for (const CTransactionRef &ptx : block.vtx) {
         SyncTransaction(ptx,
                         {CWalletTx::Status::UNCONFIRMED, /* block_height */ 0,
                          BlockHash(), /* nIndex */ 0});
     }
 }
 
 void CWallet::updatedBlockTip() {
     m_best_block_time = GetTime();
 }
 
 void CWallet::BlockUntilSyncedToCurrentChain() const {
     AssertLockNotHeld(cs_wallet);
     // Skip the queue-draining stuff if we know we're caught up with
     // chainActive.Tip(), otherwise put a callback in the validation interface
     // queue and wait for the queue to drain enough to execute it (indicating we
     // are caught up at least with the time we entered this function).
     const BlockHash last_block_hash =
         WITH_LOCK(cs_wallet, return m_last_block_processed);
     chain().waitForNotificationsIfTipChanged(last_block_hash);
 }
 
 isminetype CWallet::IsMine(const CTxIn &txin) const {
     AssertLockHeld(cs_wallet);
     std::map<TxId, CWalletTx>::const_iterator mi =
         mapWallet.find(txin.prevout.GetTxId());
     if (mi != mapWallet.end()) {
         const CWalletTx &prev = (*mi).second;
         if (txin.prevout.GetN() < prev.tx->vout.size()) {
             return IsMine(prev.tx->vout[txin.prevout.GetN()]);
         }
     }
 
     return ISMINE_NO;
 }
 
 // Note that this function doesn't distinguish between a 0-valued input, and a
 // not-"is mine" (according to the filter) input.
 Amount CWallet::GetDebit(const CTxIn &txin, const isminefilter &filter) const {
     LOCK(cs_wallet);
     std::map<TxId, CWalletTx>::const_iterator mi =
         mapWallet.find(txin.prevout.GetTxId());
     if (mi != mapWallet.end()) {
         const CWalletTx &prev = (*mi).second;
         if (txin.prevout.GetN() < prev.tx->vout.size()) {
             if (IsMine(prev.tx->vout[txin.prevout.GetN()]) & filter) {
                 return prev.tx->vout[txin.prevout.GetN()].nValue;
             }
         }
     }
 
     return Amount::zero();
 }
 
 isminetype CWallet::IsMine(const CTxOut &txout) const {
     AssertLockHeld(cs_wallet);
     return IsMine(txout.scriptPubKey);
 }
 
 isminetype CWallet::IsMine(const CTxDestination &dest) const {
     AssertLockHeld(cs_wallet);
     return IsMine(GetScriptForDestination(dest));
 }
 
 isminetype CWallet::IsMine(const CScript &script) const {
     AssertLockHeld(cs_wallet);
     isminetype result = ISMINE_NO;
     for (const auto &spk_man_pair : m_spk_managers) {
         result = std::max(result, spk_man_pair.second->IsMine(script));
     }
     return result;
 }
 
 Amount CWallet::GetCredit(const CTxOut &txout,
                           const isminefilter &filter) const {
     if (!MoneyRange(txout.nValue)) {
         throw std::runtime_error(std::string(__func__) +
                                  ": value out of range");
     }
     LOCK(cs_wallet);
     return (IsMine(txout) & filter) ? txout.nValue : Amount::zero();
 }
 
 bool CWallet::IsChange(const CTxOut &txout) const {
     return IsChange(txout.scriptPubKey);
 }
 
 bool CWallet::IsChange(const CScript &script) const {
     // TODO: fix handling of 'change' outputs. The assumption is that any
     // payment to a script that is ours, but is not in the address book is
     // change. That assumption is likely to break when we implement
     // multisignature wallets that return change back into a
     // multi-signature-protected address; a better way of identifying which
     // outputs are 'the send' and which are 'the change' will need to be
     // implemented (maybe extend CWalletTx to remember which output, if any, was
     // change).
     AssertLockHeld(cs_wallet);
     if (IsMine(script)) {
         CTxDestination address;
         if (!ExtractDestination(script, address)) {
             return true;
         }
         if (!FindAddressBookEntry(address)) {
             return true;
         }
     }
 
     return false;
 }
 
 Amount CWallet::GetChange(const CTxOut &txout) const {
     AssertLockHeld(cs_wallet);
     if (!MoneyRange(txout.nValue)) {
         throw std::runtime_error(std::string(__func__) +
                                  ": value out of range");
     }
 
     return (IsChange(txout) ? txout.nValue : Amount::zero());
 }
 
 bool CWallet::IsMine(const CTransaction &tx) const {
     AssertLockHeld(cs_wallet);
     for (const CTxOut &txout : tx.vout) {
         if (IsMine(txout)) {
             return true;
         }
     }
 
     return false;
 }
 
 bool CWallet::IsFromMe(const CTransaction &tx) const {
     return GetDebit(tx, ISMINE_ALL) > Amount::zero();
 }
 
 Amount CWallet::GetDebit(const CTransaction &tx,
                          const isminefilter &filter) const {
     Amount nDebit = Amount::zero();
     for (const CTxIn &txin : tx.vin) {
         nDebit += GetDebit(txin, filter);
         if (!MoneyRange(nDebit)) {
             throw std::runtime_error(std::string(__func__) +
                                      ": value out of range");
         }
     }
 
     return nDebit;
 }
 
 bool CWallet::IsAllFromMe(const CTransaction &tx,
                           const isminefilter &filter) const {
     LOCK(cs_wallet);
 
     for (const CTxIn &txin : tx.vin) {
         auto mi = mapWallet.find(txin.prevout.GetTxId());
         if (mi == mapWallet.end()) {
             // Any unknown inputs can't be from us.
             return false;
         }
 
         const CWalletTx &prev = (*mi).second;
 
         if (txin.prevout.GetN() >= prev.tx->vout.size()) {
             // Invalid input!
             return false;
         }
 
         if (!(IsMine(prev.tx->vout[txin.prevout.GetN()]) & filter)) {
             return false;
         }
     }
 
     return true;
 }
 
 Amount CWallet::GetCredit(const CTransaction &tx,
                           const isminefilter &filter) const {
     Amount nCredit = Amount::zero();
     for (const CTxOut &txout : tx.vout) {
         nCredit += GetCredit(txout, filter);
         if (!MoneyRange(nCredit)) {
             throw std::runtime_error(std::string(__func__) +
                                      ": value out of range");
         }
     }
 
     return nCredit;
 }
 
 Amount CWallet::GetChange(const CTransaction &tx) const {
     LOCK(cs_wallet);
     Amount nChange = Amount::zero();
     for (const CTxOut &txout : tx.vout) {
         nChange += GetChange(txout);
         if (!MoneyRange(nChange)) {
             throw std::runtime_error(std::string(__func__) +
                                      ": value out of range");
         }
     }
 
     return nChange;
 }
 
 bool CWallet::IsHDEnabled() const {
     // All Active ScriptPubKeyMans must be HD for this to be true
     bool result = true;
     for (const auto &spk_man : GetActiveScriptPubKeyMans()) {
         result &= spk_man->IsHDEnabled();
     }
     return result;
 }
 
 bool CWallet::CanGetAddresses(bool internal) const {
     LOCK(cs_wallet);
     if (m_spk_managers.empty()) {
         return false;
     }
     for (OutputType t : OUTPUT_TYPES) {
         auto spk_man = GetScriptPubKeyMan(t, internal);
         if (spk_man && spk_man->CanGetAddresses(internal)) {
             return true;
         }
     }
     return false;
 }
 
 void CWallet::SetWalletFlag(uint64_t flags) {
     LOCK(cs_wallet);
     m_wallet_flags |= flags;
     if (!WalletBatch(*database).WriteWalletFlags(m_wallet_flags)) {
         throw std::runtime_error(std::string(__func__) +
                                  ": writing wallet flags failed");
     }
 }
 
 void CWallet::UnsetWalletFlag(uint64_t flag) {
     WalletBatch batch(*database);
     UnsetWalletFlagWithDB(batch, flag);
 }
 
 void CWallet::UnsetWalletFlagWithDB(WalletBatch &batch, uint64_t flag) {
     LOCK(cs_wallet);
     m_wallet_flags &= ~flag;
     if (!batch.WriteWalletFlags(m_wallet_flags)) {
         throw std::runtime_error(std::string(__func__) +
                                  ": writing wallet flags failed");
     }
 }
 
 void CWallet::UnsetBlankWalletFlag(WalletBatch &batch) {
     UnsetWalletFlagWithDB(batch, WALLET_FLAG_BLANK_WALLET);
 }
 
 bool CWallet::IsWalletFlagSet(uint64_t flag) const {
     return (m_wallet_flags & flag);
 }
 
 bool CWallet::LoadWalletFlags(uint64_t flags) {
     LOCK(cs_wallet);
     if (((flags & KNOWN_WALLET_FLAGS) >> 32) ^ (flags >> 32)) {
         // contains unknown non-tolerable wallet flags
         return false;
     }
     m_wallet_flags = flags;
 
     return true;
 }
 
 bool CWallet::AddWalletFlags(uint64_t flags) {
     LOCK(cs_wallet);
     // We should never be writing unknown non-tolerable wallet flags
     assert(((flags & KNOWN_WALLET_FLAGS) >> 32) == (flags >> 32));
     if (!WalletBatch(*database).WriteWalletFlags(flags)) {
         throw std::runtime_error(std::string(__func__) +
                                  ": writing wallet flags failed");
     }
 
     return LoadWalletFlags(flags);
 }
 
 int64_t CWalletTx::GetTxTime() const {
     int64_t n = nTimeSmart;
     return n ? n : nTimeReceived;
 }
 
 // Helper for producing a max-sized low-S low-R signature (eg 71 bytes)
 // or a max-sized low-S signature (e.g. 72 bytes) if use_max_sig is true
 bool CWallet::DummySignInput(CTxIn &tx_in, const CTxOut &txout,
                              bool use_max_sig) const {
     // Fill in dummy signatures for fee calculation.
     const CScript &scriptPubKey = txout.scriptPubKey;
     SignatureData sigdata;
 
     std::unique_ptr<SigningProvider> provider =
         GetSolvingProvider(scriptPubKey);
     if (!provider) {
         // We don't know about this scriptpbuKey;
         return false;
     }
 
     if (!ProduceSignature(*provider,
                           use_max_sig ? DUMMY_MAXIMUM_SIGNATURE_CREATOR
                                       : DUMMY_SIGNATURE_CREATOR,
                           scriptPubKey, sigdata)) {
         return false;
     }
 
     UpdateInput(tx_in, sigdata);
     return true;
 }
 
 // Helper for producing a bunch of max-sized low-S low-R signatures (eg 71
 // bytes)
 bool CWallet::DummySignTx(CMutableTransaction &txNew,
                           const std::vector<CTxOut> &txouts,
                           bool use_max_sig) const {
     // Fill in dummy signatures for fee calculation.
     int nIn = 0;
     for (const auto &txout : txouts) {
         if (!DummySignInput(txNew.vin[nIn], txout, use_max_sig)) {
             return false;
         }
 
         nIn++;
     }
     return true;
 }
 
 bool CWallet::ImportScripts(const std::set<CScript> scripts,
                             int64_t timestamp) {
     auto spk_man = GetLegacyScriptPubKeyMan();
     if (!spk_man) {
         return false;
     }
     LOCK(spk_man->cs_KeyStore);
     return spk_man->ImportScripts(scripts, timestamp);
 }
 
 bool CWallet::ImportPrivKeys(const std::map<CKeyID, CKey> &privkey_map,
                              const int64_t timestamp) {
     auto spk_man = GetLegacyScriptPubKeyMan();
     if (!spk_man) {
         return false;
     }
     LOCK(spk_man->cs_KeyStore);
     return spk_man->ImportPrivKeys(privkey_map, timestamp);
 }
 
 bool CWallet::ImportPubKeys(
     const std::vector<CKeyID> &ordered_pubkeys,
     const std::map<CKeyID, CPubKey> &pubkey_map,
     const std::map<CKeyID, std::pair<CPubKey, KeyOriginInfo>> &key_origins,
     const bool add_keypool, const bool internal, const int64_t timestamp) {
     auto spk_man = GetLegacyScriptPubKeyMan();
     if (!spk_man) {
         return false;
     }
     LOCK(spk_man->cs_KeyStore);
     return spk_man->ImportPubKeys(ordered_pubkeys, pubkey_map, key_origins,
                                   add_keypool, internal, timestamp);
 }
 
 bool CWallet::ImportScriptPubKeys(const std::string &label,
                                   const std::set<CScript> &script_pub_keys,
                                   const bool have_solving_data,
                                   const bool apply_label,
                                   const int64_t timestamp) {
     auto spk_man = GetLegacyScriptPubKeyMan();
     if (!spk_man) {
         return false;
     }
     LOCK(spk_man->cs_KeyStore);
     if (!spk_man->ImportScriptPubKeys(script_pub_keys, have_solving_data,
                                       timestamp)) {
         return false;
     }
     if (apply_label) {
         WalletBatch batch(*database);
         for (const CScript &script : script_pub_keys) {
             CTxDestination dest;
             ExtractDestination(script, dest);
             if (IsValidDestination(dest)) {
                 SetAddressBookWithDB(batch, dest, label, "receive");
             }
         }
     }
     return true;
 }
 
 int64_t CalculateMaximumSignedTxSize(const CTransaction &tx,
                                      const CWallet *wallet, bool use_max_sig) {
     std::vector<CTxOut> txouts;
     for (auto &input : tx.vin) {
         const auto mi = wallet->mapWallet.find(input.prevout.GetTxId());
         // Can not estimate size without knowing the input details
         if (mi == wallet->mapWallet.end()) {
             return -1;
         }
         assert(input.prevout.GetN() < mi->second.tx->vout.size());
         txouts.emplace_back(mi->second.tx->vout[input.prevout.GetN()]);
     }
     return CalculateMaximumSignedTxSize(tx, wallet, txouts, use_max_sig);
 }
 
 // txouts needs to be in the order of tx.vin
 int64_t CalculateMaximumSignedTxSize(const CTransaction &tx,
                                      const CWallet *wallet,
                                      const std::vector<CTxOut> &txouts,
                                      bool use_max_sig) {
     CMutableTransaction txNew(tx);
     if (!wallet->DummySignTx(txNew, txouts, use_max_sig)) {
         return -1;
     }
     return GetSerializeSize(txNew, PROTOCOL_VERSION);
 }
 
 int CalculateMaximumSignedInputSize(const CTxOut &txout, const CWallet *wallet,
                                     bool use_max_sig) {
     CMutableTransaction txn;
     txn.vin.push_back(CTxIn(COutPoint()));
     if (!wallet->DummySignInput(txn.vin[0], txout, use_max_sig)) {
         return -1;
     }
     return GetSerializeSize(txn.vin[0], PROTOCOL_VERSION);
 }
 
 void CWalletTx::GetAmounts(std::list<COutputEntry> &listReceived,
                            std::list<COutputEntry> &listSent, Amount &nFee,
                            const isminefilter &filter) const {
     nFee = Amount::zero();
     listReceived.clear();
     listSent.clear();
 
     // Compute fee:
     Amount nDebit = GetDebit(filter);
     // debit>0 means we signed/sent this transaction.
     if (nDebit > Amount::zero()) {
         Amount nValueOut = tx->GetValueOut();
         nFee = (nDebit - nValueOut);
     }
 
     LOCK(pwallet->cs_wallet);
     // Sent/received.
     for (unsigned int i = 0; i < tx->vout.size(); ++i) {
         const CTxOut &txout = tx->vout[i];
         isminetype fIsMine = pwallet->IsMine(txout);
         // Only need to handle txouts if AT LEAST one of these is true:
         //   1) they debit from us (sent)
         //   2) the output is to us (received)
         if (nDebit > Amount::zero()) {
             // Don't report 'change' txouts
             if (pwallet->IsChange(txout)) {
                 continue;
             }
         } else if (!(fIsMine & filter)) {
             continue;
         }
 
         // In either case, we need to get the destination address.
         CTxDestination address;
 
         if (!ExtractDestination(txout.scriptPubKey, address) &&
             !txout.scriptPubKey.IsUnspendable()) {
             pwallet->WalletLogPrintf("CWalletTx::GetAmounts: Unknown "
                                      "transaction type found, txid %s\n",
                                      this->GetId().ToString());
             address = CNoDestination();
         }
 
         COutputEntry output = {address, txout.nValue, (int)i};
 
         // If we are debited by the transaction, add the output as a "sent"
         // entry.
         if (nDebit > Amount::zero()) {
             listSent.push_back(output);
         }
 
         // If we are receiving the output, add it as a "received" entry.
         if (fIsMine & filter) {
             listReceived.push_back(output);
         }
     }
 }
 
 /**
  * Scan active chain for relevant transactions after importing keys. This should
  * be called whenever new keys are added to the wallet, with the oldest key
  * creation time.
  *
  * @return Earliest timestamp that could be successfully scanned from. Timestamp
  * returned will be higher than startTime if relevant blocks could not be read.
  */
 int64_t CWallet::RescanFromTime(int64_t startTime,
                                 const WalletRescanReserver &reserver,
                                 bool update) {
     // Find starting block. May be null if nCreateTime is greater than the
     // highest blockchain timestamp, in which case there is nothing that needs
     // to be scanned.
     int start_height = 0;
     BlockHash start_block;
     bool start = chain().findFirstBlockWithTimeAndHeight(
         startTime - TIMESTAMP_WINDOW, 0,
         FoundBlock().hash(start_block).height(start_height));
     WalletLogPrintf("%s: Rescanning last %i blocks\n", __func__,
                     start ? WITH_LOCK(cs_wallet, return GetLastBlockHeight()) -
                                 start_height + 1
                           : 0);
 
     if (start) {
         // TODO: this should take into account failure by ScanResult::USER_ABORT
         ScanResult result = ScanForWalletTransactions(
             start_block, start_height, {} /* max_height */, reserver, update);
         if (result.status == ScanResult::FAILURE) {
             int64_t time_max;
             CHECK_NONFATAL(chain().findBlock(result.last_failed_block,
                                              FoundBlock().maxTime(time_max)));
             return time_max + TIMESTAMP_WINDOW + 1;
         }
     }
     return startTime;
 }
 
 /**
  * Scan the block chain (starting in start_block) for transactions from or to
  * us. If fUpdate is true, found transactions that already exist in the wallet
  * will be updated.
  *
  * @param[in] start_block Scan starting block. If block is not on the active
  *                        chain, the scan will return SUCCESS immediately.
  * @param[in] start_height Height of start_block
  * @param[in] max_height  Optional max scanning height. If unset there is
  *                        no maximum and scanning can continue to the tip
  *
  * @return ScanResult returning scan information and indicating success or
  *         failure. Return status will be set to SUCCESS if scan was
  *         successful. FAILURE if a complete rescan was not possible (due to
  *         pruning or corruption). USER_ABORT if the rescan was aborted before
  *         it could complete.
  *
  * @pre Caller needs to make sure start_block (and the optional stop_block) are
  * on the main chain after to the addition of any new keys you want to detect
  * transactions for.
  */
 CWallet::ScanResult CWallet::ScanForWalletTransactions(
     const BlockHash &start_block, int start_height,
     std::optional<int> max_height, const WalletRescanReserver &reserver,
     bool fUpdate) {
     int64_t nNow = GetTime();
     int64_t start_time = GetTimeMillis();
 
     assert(reserver.isReserved());
 
     BlockHash block_hash = start_block;
     ScanResult result;
 
     WalletLogPrintf("Rescan started from block %s...\n",
                     start_block.ToString());
 
     fAbortRescan = false;
     // Show rescan progress in GUI as dialog or on splashscreen, if -rescan on
     // startup.
     ShowProgress(
         strprintf("%s " + _("Rescanning...").translated, GetDisplayName()), 0);
     BlockHash tip_hash = WITH_LOCK(cs_wallet, return GetLastBlockHash());
     BlockHash end_hash = tip_hash;
     if (max_height) {
         chain().findAncestorByHeight(tip_hash, *max_height,
                                      FoundBlock().hash(end_hash));
     }
     double progress_begin = chain().guessVerificationProgress(block_hash);
     double progress_end = chain().guessVerificationProgress(end_hash);
     double progress_current = progress_begin;
     int block_height = start_height;
     while (!fAbortRescan && !chain().shutdownRequested()) {
         m_scanning_progress = (progress_current - progress_begin) /
                               (progress_end - progress_begin);
         if (block_height % 100 == 0 && progress_end - progress_begin > 0.0) {
             ShowProgress(
                 strprintf("%s " + _("Rescanning...").translated,
                           GetDisplayName()),
                 std::max(1, std::min(99, (int)(m_scanning_progress * 100))));
         }
         if (GetTime() >= nNow + 60) {
             nNow = GetTime();
             WalletLogPrintf("Still rescanning. At block %d. Progress=%f\n",
                             block_height, progress_current);
         }
 
         CBlock block;
         bool next_block;
         BlockHash next_block_hash;
         bool reorg = false;
         if (chain().findBlock(block_hash, FoundBlock().data(block)) &&
             !block.IsNull()) {
             LOCK(cs_wallet);
             next_block = chain().findNextBlock(
                 block_hash, block_height, FoundBlock().hash(next_block_hash),
                 &reorg);
             if (reorg) {
                 // Abort scan if current block is no longer active, to prevent
                 // marking transactions as coming from the wrong block.
                 // TODO: This should return success instead of failure, see
                 // https://github.com/bitcoin/bitcoin/pull/14711#issuecomment-458342518
                 result.last_failed_block = block_hash;
                 result.status = ScanResult::FAILURE;
                 break;
             }
             for (size_t posInBlock = 0; posInBlock < block.vtx.size();
                  ++posInBlock) {
                 CWalletTx::Confirmation confirm(CWalletTx::Status::CONFIRMED,
                                                 block_height, block_hash,
                                                 posInBlock);
                 SyncTransaction(block.vtx[posInBlock],
                                 {CWalletTx::Status::CONFIRMED, block_height,
                                  block_hash, int(posInBlock)},
                                 fUpdate);
             }
             // scan succeeded, record block as most recent successfully
             // scanned
             result.last_scanned_block = block_hash;
             result.last_scanned_height = block_height;
         } else {
             // could not scan block, keep scanning but record this block as
             // the most recent failure
             result.last_failed_block = block_hash;
             result.status = ScanResult::FAILURE;
             next_block = chain().findNextBlock(
                 block_hash, block_height, FoundBlock().hash(next_block_hash),
                 &reorg);
         }
         if (max_height && block_height >= *max_height) {
             break;
         }
         {
             if (!next_block || reorg) {
                 // break successfully when rescan has reached the tip, or
                 // previous block is no longer on the chain due to a reorg
                 break;
             }
 
             // increment block and verification progress
             block_hash = next_block_hash;
             ++block_height;
             progress_current = chain().guessVerificationProgress(block_hash);
 
             // handle updated tip hash
             const BlockHash prev_tip_hash = tip_hash;
             tip_hash = WITH_LOCK(cs_wallet, return GetLastBlockHash());
             if (!max_height && prev_tip_hash != tip_hash) {
                 // in case the tip has changed, update progress max
                 progress_end = chain().guessVerificationProgress(tip_hash);
             }
         }
     }
 
     // Hide progress dialog in GUI.
     ShowProgress(
         strprintf("%s " + _("Rescanning...").translated, GetDisplayName()),
         100);
     if (block_height && fAbortRescan) {
         WalletLogPrintf("Rescan aborted at block %d. Progress=%f\n",
                         block_height, progress_current);
         result.status = ScanResult::USER_ABORT;
     } else if (block_height && chain().shutdownRequested()) {
         WalletLogPrintf(
             "Rescan interrupted by shutdown request at block %d. Progress=%f\n",
             block_height, progress_current);
         result.status = ScanResult::USER_ABORT;
     } else {
         WalletLogPrintf("Rescan completed in %15dms\n",
                         GetTimeMillis() - start_time);
     }
     return result;
 }
 
 void CWallet::ReacceptWalletTransactions() {
     // If transactions aren't being broadcasted, don't let them into local
     // mempool either.
     if (!fBroadcastTransactions) {
         return;
     }
 
     std::map<int64_t, CWalletTx *> mapSorted;
 
     // Sort pending wallet transactions based on their initial wallet insertion
     // order.
     for (std::pair<const TxId, CWalletTx> &item : mapWallet) {
         const TxId &wtxid = item.first;
         CWalletTx &wtx = item.second;
         assert(wtx.GetId() == wtxid);
 
         int nDepth = wtx.GetDepthInMainChain();
 
         if (!wtx.IsCoinBase() && (nDepth == 0 && !wtx.isAbandoned())) {
             mapSorted.insert(std::make_pair(wtx.nOrderPos, &wtx));
         }
     }
 
     // Try to add wallet transactions to memory pool.
     for (const std::pair<const int64_t, CWalletTx *> &item : mapSorted) {
         CWalletTx &wtx = *(item.second);
         std::string unused_err_string;
         wtx.SubmitMemoryPoolAndRelay(unused_err_string, false);
     }
 }
 
 bool CWalletTx::SubmitMemoryPoolAndRelay(std::string &err_string, bool relay) {
     // Can't relay if wallet is not broadcasting
     if (!pwallet->GetBroadcastTransactions()) {
         return false;
     }
     // Don't relay abandoned transactions
     if (isAbandoned()) {
         return false;
     }
     // Don't try to submit coinbase transactions. These would fail anyway but
     // would cause log spam.
     if (IsCoinBase()) {
         return false;
     }
     // Don't try to submit conflicted or confirmed transactions.
     if (GetDepthInMainChain() != 0) {
         return false;
     }
 
     // Submit transaction to mempool for relay
     pwallet->WalletLogPrintf("Submitting wtx %s to mempool for relay\n",
                              GetId().ToString());
     // We must set fInMempool here - while it will be re-set to true by the
     // entered-mempool callback, if we did not there would be a race where a
     // user could call sendmoney in a loop and hit spurious out of funds errors
     // because we think that this newly generated transaction's change is
     // unavailable as we're not yet aware that it is in the mempool.
     //
     // Irrespective of the failure reason, un-marking fInMempool
     // out-of-order is incorrect - it should be unmarked when
     // TransactionRemovedFromMempool fires.
     bool ret = pwallet->chain().broadcastTransaction(
         GetConfig(), tx, pwallet->m_default_max_tx_fee, relay, err_string);
     fInMempool |= ret;
     return ret;
 }
 
 std::set<TxId> CWalletTx::GetConflicts() const {
     std::set<TxId> result;
     if (pwallet != nullptr) {
         const TxId &txid = GetId();
         result = pwallet->GetConflicts(txid);
         result.erase(txid);
     }
 
     return result;
 }
 
 Amount CWalletTx::GetCachableAmount(AmountType type, const isminefilter &filter,
                                     bool recalculate) const {
     auto &amount = m_amounts[type];
     if (recalculate || !amount.m_cached[filter]) {
         amount.Set(filter, type == DEBIT ? pwallet->GetDebit(*tx, filter)
                                          : pwallet->GetCredit(*tx, filter));
         m_is_cache_empty = false;
     }
     return amount.m_value[filter];
 }
 
 Amount CWalletTx::GetDebit(const isminefilter &filter) const {
     if (tx->vin.empty()) {
         return Amount::zero();
     }
 
     Amount debit = Amount::zero();
     if (filter & ISMINE_SPENDABLE) {
         debit += GetCachableAmount(DEBIT, ISMINE_SPENDABLE);
     }
     if (filter & ISMINE_WATCH_ONLY) {
         debit += GetCachableAmount(DEBIT, ISMINE_WATCH_ONLY);
     }
 
     return debit;
 }
 
 Amount CWalletTx::GetCredit(const isminefilter &filter) const {
     // Must wait until coinbase is safely deep enough in the chain before
     // valuing it.
     if (IsImmatureCoinBase()) {
         return Amount::zero();
     }
 
     Amount credit = Amount::zero();
     if (filter & ISMINE_SPENDABLE) {
         // GetBalance can assume transactions in mapWallet won't change.
         credit += GetCachableAmount(CREDIT, ISMINE_SPENDABLE);
     }
 
     if (filter & ISMINE_WATCH_ONLY) {
         credit += GetCachableAmount(CREDIT, ISMINE_WATCH_ONLY);
     }
 
     return credit;
 }
 
 Amount CWalletTx::GetImmatureCredit(bool fUseCache) const {
     if (IsImmatureCoinBase() && IsInMainChain()) {
         return GetCachableAmount(IMMATURE_CREDIT, ISMINE_SPENDABLE, !fUseCache);
     }
 
     return Amount::zero();
 }
 
 Amount CWalletTx::GetAvailableCredit(bool fUseCache,
                                      const isminefilter &filter) const {
     if (pwallet == nullptr) {
         return Amount::zero();
     }
 
     // Avoid caching ismine for NO or ALL cases (could remove this check and
     // simplify in the future).
     bool allow_cache =
         (filter & ISMINE_ALL) && (filter & ISMINE_ALL) != ISMINE_ALL;
 
     // Must wait until coinbase is safely deep enough in the chain before
     // valuing it.
     if (IsImmatureCoinBase()) {
         return Amount::zero();
     }
 
     if (fUseCache && allow_cache &&
         m_amounts[AVAILABLE_CREDIT].m_cached[filter]) {
         return m_amounts[AVAILABLE_CREDIT].m_value[filter];
     }
 
     bool allow_used_addresses =
         (filter & ISMINE_USED) ||
         !pwallet->IsWalletFlagSet(WALLET_FLAG_AVOID_REUSE);
     Amount nCredit = Amount::zero();
     const TxId &txid = GetId();
     for (uint32_t i = 0; i < tx->vout.size(); i++) {
         if (!pwallet->IsSpent(COutPoint(txid, i)) &&
             (allow_used_addresses || !pwallet->IsSpentKey(txid, i))) {
             const CTxOut &txout = tx->vout[i];
             nCredit += pwallet->GetCredit(txout, filter);
             if (!MoneyRange(nCredit)) {
                 throw std::runtime_error(std::string(__func__) +
                                          " : value out of range");
             }
         }
     }
 
     if (allow_cache) {
         m_amounts[AVAILABLE_CREDIT].Set(filter, nCredit);
         m_is_cache_empty = false;
     }
 
     return nCredit;
 }
 
 Amount CWalletTx::GetImmatureWatchOnlyCredit(const bool fUseCache) const {
     if (IsImmatureCoinBase() && IsInMainChain()) {
         return GetCachableAmount(IMMATURE_CREDIT, ISMINE_WATCH_ONLY,
                                  !fUseCache);
     }
 
     return Amount::zero();
 }
 
 Amount CWalletTx::GetChange() const {
     if (fChangeCached) {
         return nChangeCached;
     }
 
     nChangeCached = pwallet->GetChange(*tx);
     fChangeCached = true;
     return nChangeCached;
 }
 
 bool CWalletTx::InMempool() const {
     return fInMempool;
 }
 
 bool CWalletTx::IsTrusted() const {
     std::set<TxId> trusted_parents;
     LOCK(pwallet->cs_wallet);
     return pwallet->IsTrusted(*this, trusted_parents);
 }
 
 bool CWallet::IsTrusted(const CWalletTx &wtx,
                         std::set<TxId> &trusted_parents) const {
     AssertLockHeld(cs_wallet);
     // Quick answer in most cases
     TxValidationState state;
     if (!chain().contextualCheckTransactionForCurrentBlock(*wtx.tx, state)) {
         return false;
     }
 
     int nDepth = wtx.GetDepthInMainChain();
     if (nDepth >= 1) {
         return true;
     }
 
     if (nDepth < 0) {
         return false;
     }
 
     // using wtx's cached debit
     if (!m_spend_zero_conf_change || !wtx.IsFromMe(ISMINE_ALL)) {
         return false;
     }
 
     // Don't trust unconfirmed transactions from us unless they are in the
     // mempool.
     if (!wtx.InMempool()) {
         return false;
     }
 
     // Trusted if all inputs are from us and are in the mempool:
     for (const CTxIn &txin : wtx.tx->vin) {
         // Transactions not sent by us: not trusted
         const CWalletTx *parent = GetWalletTx(txin.prevout.GetTxId());
         if (parent == nullptr) {
             return false;
         }
 
         const CTxOut &parentOut = parent->tx->vout[txin.prevout.GetN()];
         // Check that this specific input being spent is trusted
         if (IsMine(parentOut) != ISMINE_SPENDABLE) {
             return false;
         }
         // If we've already trusted this parent, continue
         if (trusted_parents.count(parent->GetId())) {
             continue;
         }
         // Recurse to check that the parent is also trusted
         if (!IsTrusted(*parent, trusted_parents)) {
             return false;
         }
         trusted_parents.insert(parent->GetId());
     }
 
     return true;
 }
 
 bool CWalletTx::IsEquivalentTo(const CWalletTx &_tx) const {
     CMutableTransaction tx1{*this->tx};
     CMutableTransaction tx2{*_tx.tx};
     for (auto &txin : tx1.vin) {
         txin.scriptSig = CScript();
     }
 
     for (auto &txin : tx2.vin) {
         txin.scriptSig = CScript();
     }
 
     return CTransaction(tx1) == CTransaction(tx2);
 }
 
 // Rebroadcast transactions from the wallet. We do this on a random timer
 // to slightly obfuscate which transactions come from our wallet.
 //
 // Ideally, we'd only resend transactions that we think should have been
 // mined in the most recent block. Any transaction that wasn't in the top
 // blockweight of transactions in the mempool shouldn't have been mined,
 // and so is probably just sitting in the mempool waiting to be confirmed.
 // Rebroadcasting does nothing to speed up confirmation and only damages
 // privacy.
 void CWallet::ResendWalletTransactions() {
     // During reindex, importing and IBD, old wallet transactions become
     // unconfirmed. Don't resend them as that would spam other nodes.
     if (!chain().isReadyToBroadcast()) {
         return;
     }
 
     // Do this infrequently and randomly to avoid giving away that these are our
     // transactions.
     if (GetTime() < nNextResend || !fBroadcastTransactions) {
         return;
     }
 
     bool fFirst = (nNextResend == 0);
     // resend 12-36 hours from now, ~1 day on average.
     nNextResend = GetTime() + (12 * 60 * 60) + GetRand(24 * 60 * 60);
     if (fFirst) {
         return;
     }
 
     int submitted_tx_count = 0;
 
     { // cs_wallet scope
         LOCK(cs_wallet);
 
         // Relay transactions
         for (std::pair<const TxId, CWalletTx> &item : mapWallet) {
             CWalletTx &wtx = item.second;
             // Attempt to rebroadcast all txes more than 5 minutes older than
             // the last block. SubmitMemoryPoolAndRelay() will not rebroadcast
             // any confirmed or conflicting txs.
             if (wtx.nTimeReceived > m_best_block_time - 5 * 60) {
                 continue;
             }
             std::string unused_err_string;
             if (wtx.SubmitMemoryPoolAndRelay(unused_err_string, true)) {
                 ++submitted_tx_count;
             }
         }
     } // cs_wallet
 
     if (submitted_tx_count > 0) {
         WalletLogPrintf("%s: resubmit %u unconfirmed transactions\n", __func__,
                         submitted_tx_count);
     }
 }
 
 /** @} */ // end of mapWallet
 
 void MaybeResendWalletTxs() {
     for (const std::shared_ptr<CWallet> &pwallet : GetWallets()) {
         pwallet->ResendWalletTransactions();
     }
 }
 
 /**
  * @defgroup Actions
  *
  * @{
  */
 CWallet::Balance CWallet::GetBalance(const int min_depth,
                                      bool avoid_reuse) const {
     Balance ret;
     isminefilter reuse_filter = avoid_reuse ? ISMINE_NO : ISMINE_USED;
     LOCK(cs_wallet);
     std::set<TxId> trusted_parents;
     for (const auto &entry : mapWallet) {
         const CWalletTx &wtx = entry.second;
         const bool is_trusted{IsTrusted(wtx, trusted_parents)};
         const int tx_depth{wtx.GetDepthInMainChain()};
         const Amount tx_credit_mine{wtx.GetAvailableCredit(
             /* fUseCache */ true, ISMINE_SPENDABLE | reuse_filter)};
         const Amount tx_credit_watchonly{wtx.GetAvailableCredit(
             /* fUseCache */ true, ISMINE_WATCH_ONLY | reuse_filter)};
         if (is_trusted && tx_depth >= min_depth) {
             ret.m_mine_trusted += tx_credit_mine;
             ret.m_watchonly_trusted += tx_credit_watchonly;
         }
         if (!is_trusted && tx_depth == 0 && wtx.InMempool()) {
             ret.m_mine_untrusted_pending += tx_credit_mine;
             ret.m_watchonly_untrusted_pending += tx_credit_watchonly;
         }
         ret.m_mine_immature += wtx.GetImmatureCredit();
         ret.m_watchonly_immature += wtx.GetImmatureWatchOnlyCredit();
     }
     return ret;
 }
 
 Amount CWallet::GetAvailableBalance(const CCoinControl *coinControl) const {
     LOCK(cs_wallet);
 
     Amount balance = Amount::zero();
     std::vector<COutput> vCoins;
     AvailableCoins(vCoins, true, coinControl);
     for (const COutput &out : vCoins) {
         if (out.fSpendable) {
             balance += out.tx->tx->vout[out.i].nValue;
         }
     }
     return balance;
 }
 
 void CWallet::AvailableCoins(std::vector<COutput> &vCoins, bool fOnlySafe,
                              const CCoinControl *coinControl,
                              const Amount nMinimumAmount,
                              const Amount nMaximumAmount,
                              const Amount nMinimumSumAmount,
                              const uint64_t nMaximumCount) const {
     AssertLockHeld(cs_wallet);
 
     vCoins.clear();
     Amount nTotal = Amount::zero();
     // Either the WALLET_FLAG_AVOID_REUSE flag is not set (in which case we
     // always allow), or we default to avoiding, and only in the case where a
     // coin control object is provided, and has the avoid address reuse flag set
     // to false, do we allow already used addresses
     bool allow_used_addresses =
         !IsWalletFlagSet(WALLET_FLAG_AVOID_REUSE) ||
         (coinControl && !coinControl->m_avoid_address_reuse);
     const int min_depth = {coinControl ? coinControl->m_min_depth
                                        : DEFAULT_MIN_DEPTH};
     const int max_depth = {coinControl ? coinControl->m_max_depth
                                        : DEFAULT_MAX_DEPTH};
 
     std::set<TxId> trusted_parents;
     for (const auto &entry : mapWallet) {
         const TxId &wtxid = entry.first;
         const CWalletTx &wtx = entry.second;
 
         TxValidationState state;
         if (!chain().contextualCheckTransactionForCurrentBlock(*wtx.tx,
                                                                state)) {
             continue;
         }
 
         if (wtx.IsImmatureCoinBase()) {
             continue;
         }
 
         int nDepth = wtx.GetDepthInMainChain();
         if (nDepth < 0) {
             continue;
         }
 
         // We should not consider coins which aren't at least in our mempool.
         // It's possible for these to be conflicted via ancestors which we may
         // never be able to detect.
         if (nDepth == 0 && !wtx.InMempool()) {
             continue;
         }
 
         bool safeTx = IsTrusted(wtx, trusted_parents);
 
         // Bitcoin-ABC: Removed check that prevents consideration of coins from
         // transactions that are replacing other transactions. This check based
         // on wtx.mapValue.count("replaces_txid") which was not being set
         // anywhere.
 
         // Similarly, we should not consider coins from transactions that have
         // been replaced. In the example above, we would want to prevent
         // creation of a transaction A' spending an output of A, because if
         // transaction B were initially confirmed, conflicting with A and A', we
         // wouldn't want to the user to create a transaction D intending to
         // replace A', but potentially resulting in a scenario where A, A', and
         // D could all be accepted (instead of just B and D, or just A and A'
         // like the user would want).
 
         // Bitcoin-ABC: retained this check as 'replaced_by_txid' is still set
         // in the wallet code.
         if (nDepth == 0 && wtx.mapValue.count("replaced_by_txid")) {
             safeTx = false;
         }
 
         if (fOnlySafe && !safeTx) {
             continue;
         }
 
         if (nDepth < min_depth || nDepth > max_depth) {
             continue;
         }
 
         for (uint32_t i = 0; i < wtx.tx->vout.size(); i++) {
             // Only consider selected coins if add_inputs is false
             if (coinControl && !coinControl->m_add_inputs &&
                 !coinControl->IsSelected(COutPoint(entry.first, i))) {
                 continue;
             }
 
             if (wtx.tx->vout[i].nValue < nMinimumAmount ||
                 wtx.tx->vout[i].nValue > nMaximumAmount) {
                 continue;
             }
 
             const COutPoint outpoint(wtxid, i);
 
             if (coinControl && coinControl->HasSelected() &&
                 !coinControl->fAllowOtherInputs &&
                 !coinControl->IsSelected(outpoint)) {
                 continue;
             }
 
             if (IsLockedCoin(outpoint)) {
                 continue;
             }
 
             if (IsSpent(outpoint)) {
                 continue;
             }
 
             isminetype mine = IsMine(wtx.tx->vout[i]);
 
             if (mine == ISMINE_NO) {
                 continue;
             }
 
             if (!allow_used_addresses && IsSpentKey(wtxid, i)) {
                 continue;
             }
 
             std::unique_ptr<SigningProvider> provider =
                 GetSolvingProvider(wtx.tx->vout[i].scriptPubKey);
 
             bool solvable =
                 provider ? IsSolvable(*provider, wtx.tx->vout[i].scriptPubKey)
                          : false;
             bool spendable =
                 ((mine & ISMINE_SPENDABLE) != ISMINE_NO) ||
                 (((mine & ISMINE_WATCH_ONLY) != ISMINE_NO) &&
                  (coinControl && coinControl->fAllowWatchOnly && solvable));
 
             vCoins.push_back(
                 COutput(&wtx, i, nDepth, spendable, solvable, safeTx,
                         (coinControl && coinControl->fAllowWatchOnly)));
 
             // Checks the sum amount of all UTXO's.
             if (nMinimumSumAmount != MAX_MONEY) {
                 nTotal += wtx.tx->vout[i].nValue;
 
                 if (nTotal >= nMinimumSumAmount) {
                     return;
                 }
             }
 
             // Checks the maximum number of UTXO's.
             if (nMaximumCount > 0 && vCoins.size() >= nMaximumCount) {
                 return;
             }
         }
     }
 }
 
 std::map<CTxDestination, std::vector<COutput>> CWallet::ListCoins() const {
     AssertLockHeld(cs_wallet);
 
     std::map<CTxDestination, std::vector<COutput>> result;
     std::vector<COutput> availableCoins;
 
     AvailableCoins(availableCoins);
 
     for (const auto &coin : availableCoins) {
         CTxDestination address;
         if ((coin.fSpendable ||
              (IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS) &&
               coin.fSolvable)) &&
             ExtractDestination(
                 FindNonChangeParentOutput(*coin.tx->tx, coin.i).scriptPubKey,
                 address)) {
             result[address].emplace_back(std::move(coin));
         }
     }
 
     std::vector<COutPoint> lockedCoins;
     ListLockedCoins(lockedCoins);
     // Include watch-only for LegacyScriptPubKeyMan wallets without private keys
     const bool include_watch_only =
         GetLegacyScriptPubKeyMan() &&
         IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS);
     const isminetype is_mine_filter =
         include_watch_only ? ISMINE_WATCH_ONLY : ISMINE_SPENDABLE;
     for (const auto &output : lockedCoins) {
         auto it = mapWallet.find(output.GetTxId());
         if (it != mapWallet.end()) {
             int depth = it->second.GetDepthInMainChain();
             if (depth >= 0 && output.GetN() < it->second.tx->vout.size() &&
                 IsMine(it->second.tx->vout[output.GetN()]) == is_mine_filter) {
                 CTxDestination address;
                 if (ExtractDestination(
                         FindNonChangeParentOutput(*it->second.tx, output.GetN())
                             .scriptPubKey,
                         address)) {
                     result[address].emplace_back(
                         &it->second, output.GetN(), depth, true /* spendable */,
                         true /* solvable */, false /* safe */);
                 }
             }
         }
     }
 
     return result;
 }
 
 const CTxOut &CWallet::FindNonChangeParentOutput(const CTransaction &tx,
                                                  int output) const {
     const CTransaction *ptx = &tx;
     int n = output;
     while (IsChange(ptx->vout[n]) && ptx->vin.size() > 0) {
         const COutPoint &prevout = ptx->vin[0].prevout;
         auto it = mapWallet.find(prevout.GetTxId());
         if (it == mapWallet.end() ||
             it->second.tx->vout.size() <= prevout.GetN() ||
             !IsMine(it->second.tx->vout[prevout.GetN()])) {
             break;
         }
         ptx = it->second.tx.get();
         n = prevout.GetN();
     }
     return ptx->vout[n];
 }
 
 bool CWallet::SelectCoinsMinConf(
     const Amount nTargetValue, const CoinEligibilityFilter &eligibility_filter,
     std::vector<OutputGroup> groups, std::set<CInputCoin> &setCoinsRet,
     Amount &nValueRet, const CoinSelectionParams &coin_selection_params,
     bool &bnb_used) const {
     setCoinsRet.clear();
     nValueRet = Amount::zero();
 
     std::vector<OutputGroup> utxo_pool;
     if (coin_selection_params.use_bnb) {
         // Get long term estimate
         CCoinControl temp;
         temp.m_confirm_target = 1008;
         CFeeRate long_term_feerate = GetMinimumFeeRate(*this, temp);
 
         // Calculate cost of change
         Amount cost_of_change = chain().relayDustFee().GetFee(
                                     coin_selection_params.change_spend_size) +
                                 coin_selection_params.effective_fee.GetFee(
                                     coin_selection_params.change_output_size);
 
         // Filter by the min conf specs and add to utxo_pool and calculate
         // effective value
         for (OutputGroup &group : groups) {
             if (!group.EligibleForSpending(eligibility_filter)) {
                 continue;
             }
 
             if (coin_selection_params.m_subtract_fee_outputs) {
                 // Set the effective feerate to 0 as we don't want to use the
                 // effective value since the fees will be deducted from the
                 // output
                 group.SetFees(CFeeRate(Amount::zero()) /* effective_feerate */,
                               long_term_feerate);
             } else {
                 group.SetFees(coin_selection_params.effective_fee,
                               long_term_feerate);
             }
 
             OutputGroup pos_group = group.GetPositiveOnlyGroup();
             if (pos_group.effective_value > Amount::zero()) {
                 utxo_pool.push_back(pos_group);
             }
         }
         // Calculate the fees for things that aren't inputs
         Amount not_input_fees = coin_selection_params.effective_fee.GetFee(
             coin_selection_params.tx_noinputs_size);
         bnb_used = true;
         return SelectCoinsBnB(utxo_pool, nTargetValue, cost_of_change,
                               setCoinsRet, nValueRet, not_input_fees);
     } else {
         // Filter by the min conf specs and add to utxo_pool
         for (const OutputGroup &group : groups) {
             if (!group.EligibleForSpending(eligibility_filter)) {
                 continue;
             }
             utxo_pool.push_back(group);
         }
         bnb_used = false;
         return KnapsackSolver(nTargetValue, utxo_pool, setCoinsRet, nValueRet);
     }
 }
 
 bool CWallet::SelectCoins(const std::vector<COutput> &vAvailableCoins,
                           const Amount nTargetValue,
                           std::set<CInputCoin> &setCoinsRet, Amount &nValueRet,
                           const CCoinControl &coin_control,
                           CoinSelectionParams &coin_selection_params,
                           bool &bnb_used) const {
     std::vector<COutput> vCoins(vAvailableCoins);
     Amount value_to_select = nTargetValue;
 
     // Default to bnb was not used. If we use it, we set it later
     bnb_used = false;
 
     // coin control -> return all selected outputs (we want all selected to go
     // into the transaction for sure)
     if (coin_control.HasSelected() && !coin_control.fAllowOtherInputs) {
         for (const COutput &out : vCoins) {
             if (!out.fSpendable) {
                 continue;
             }
 
             nValueRet += out.tx->tx->vout[out.i].nValue;
             setCoinsRet.insert(out.GetInputCoin());
         }
 
         return (nValueRet >= nTargetValue);
     }
 
     // Calculate value from preset inputs and store them.
     std::set<CInputCoin> setPresetCoins;
     Amount nValueFromPresetInputs = Amount::zero();
 
     std::vector<COutPoint> vPresetInputs;
     coin_control.ListSelected(vPresetInputs);
 
     for (const COutPoint &outpoint : vPresetInputs) {
         std::map<TxId, CWalletTx>::const_iterator it =
             mapWallet.find(outpoint.GetTxId());
         if (it != mapWallet.end()) {
             const CWalletTx &wtx = it->second;
             // Clearly invalid input, fail
             if (wtx.tx->vout.size() <= outpoint.GetN()) {
                 return false;
             }
             // Just to calculate the marginal byte size
             CInputCoin coin(wtx.tx, outpoint.GetN(),
                             wtx.GetSpendSize(outpoint.GetN(), false));
             nValueFromPresetInputs += coin.txout.nValue;
             if (coin.m_input_bytes <= 0) {
                 // Not solvable, can't estimate size for fee
                 return false;
             }
             coin.effective_value =
                 coin.txout.nValue -
                 coin_selection_params.effective_fee.GetFee(coin.m_input_bytes);
             if (coin_selection_params.use_bnb) {
                 value_to_select -= coin.effective_value;
             } else {
                 value_to_select -= coin.txout.nValue;
             }
             setPresetCoins.insert(coin);
         } else {
             return false; // TODO: Allow non-wallet inputs
         }
     }
 
     // Remove preset inputs from vCoins
     for (std::vector<COutput>::iterator it = vCoins.begin();
          it != vCoins.end() && coin_control.HasSelected();) {
         if (setPresetCoins.count(it->GetInputCoin())) {
             it = vCoins.erase(it);
         } else {
             ++it;
         }
     }
 
     size_t max_ancestors{0};
     size_t max_descendants{0};
     chain().getPackageLimits(max_ancestors, max_descendants);
     bool fRejectLongChains = gArgs.GetBoolArg(
         "-walletrejectlongchains", DEFAULT_WALLET_REJECT_LONG_CHAINS);
 
     // form groups from remaining coins; note that preset coins will not
     // automatically have their associated (same address) coins included
     if (coin_control.m_avoid_partial_spends &&
         vCoins.size() > OUTPUT_GROUP_MAX_ENTRIES) {
         // Cases where we have 11+ outputs all pointing to the same destination
         // may result in privacy leaks as they will potentially be
         // deterministically sorted. We solve that by explicitly shuffling the
         // outputs before processing
         Shuffle(vCoins.begin(), vCoins.end(), FastRandomContext());
     }
 
     std::vector<OutputGroup> groups = GroupOutputs(
         vCoins, !coin_control.m_avoid_partial_spends, max_ancestors);
 
     bool res =
         value_to_select <= Amount::zero() ||
         SelectCoinsMinConf(value_to_select, CoinEligibilityFilter(1, 6, 0),
                            groups, setCoinsRet, nValueRet,
                            coin_selection_params, bnb_used) ||
         SelectCoinsMinConf(value_to_select, CoinEligibilityFilter(1, 1, 0),
                            groups, setCoinsRet, nValueRet,
                            coin_selection_params, bnb_used) ||
         (m_spend_zero_conf_change &&
          SelectCoinsMinConf(value_to_select, CoinEligibilityFilter(0, 1, 2),
                             groups, setCoinsRet, nValueRet,
                             coin_selection_params, bnb_used)) ||
         (m_spend_zero_conf_change &&
          SelectCoinsMinConf(
              value_to_select,
              CoinEligibilityFilter(0, 1, std::min((size_t)4, max_ancestors / 3),
                                    std::min((size_t)4, max_descendants / 3)),
              groups, setCoinsRet, nValueRet, coin_selection_params,
              bnb_used)) ||
         (m_spend_zero_conf_change &&
          SelectCoinsMinConf(value_to_select,
                             CoinEligibilityFilter(0, 1, max_ancestors / 2,
                                                   max_descendants / 2),
                             groups, setCoinsRet, nValueRet,
                             coin_selection_params, bnb_used)) ||
         (m_spend_zero_conf_change &&
          SelectCoinsMinConf(value_to_select,
                             CoinEligibilityFilter(0, 1, max_ancestors - 1,
                                                   max_descendants - 1),
                             groups, setCoinsRet, nValueRet,
                             coin_selection_params, bnb_used)) ||
         (m_spend_zero_conf_change && !fRejectLongChains &&
          SelectCoinsMinConf(
              value_to_select,
              CoinEligibilityFilter(0, 1, std::numeric_limits<uint64_t>::max()),
              groups, setCoinsRet, nValueRet, coin_selection_params, bnb_used));
 
     // Because SelectCoinsMinConf clears the setCoinsRet, we now add the
     // possible inputs to the coinset.
     util::insert(setCoinsRet, setPresetCoins);
 
     // Add preset inputs to the total value selected.
     nValueRet += nValueFromPresetInputs;
 
     return res;
 }
 
 bool CWallet::SignTransaction(CMutableTransaction &tx) const {
     AssertLockHeld(cs_wallet);
 
     // Build coins map
     std::map<COutPoint, Coin> coins;
     for (auto &input : tx.vin) {
         auto mi = mapWallet.find(input.prevout.GetTxId());
         if (mi == mapWallet.end() ||
             input.prevout.GetN() >= mi->second.tx->vout.size()) {
             return false;
         }
         const CWalletTx &wtx = mi->second;
         coins[input.prevout] =
             Coin(wtx.tx->vout[input.prevout.GetN()], wtx.m_confirm.block_height,
                  wtx.IsCoinBase());
     }
     std::map<int, std::string> input_errors;
     return SignTransaction(tx, coins, SigHashType().withForkId(), input_errors);
 }
 
 bool CWallet::SignTransaction(CMutableTransaction &tx,
                               const std::map<COutPoint, Coin> &coins,
                               SigHashType sighash,
                               std::map<int, std::string> &input_errors) const {
     // Try to sign with all ScriptPubKeyMans
     for (ScriptPubKeyMan *spk_man : GetAllScriptPubKeyMans()) {
         // spk_man->SignTransaction will return true if the transaction is
         // complete, so we can exit early and return true if that happens
         if (spk_man->SignTransaction(tx, coins, sighash, input_errors)) {
             return true;
         }
     }
 
     // At this point, one input was not fully signed otherwise we would have
     // exited already
 
     // When there are no available providers for the remaining inputs, use the
     // legacy provider so we can get proper error messages.
     auto legacy_spk_man = GetLegacyScriptPubKeyMan();
     if (legacy_spk_man &&
         legacy_spk_man->SignTransaction(tx, coins, sighash, input_errors)) {
         return true;
     }
 
     return false;
 }
 
 TransactionError CWallet::FillPSBT(PartiallySignedTransaction &psbtx,
                                    bool &complete, SigHashType sighash_type,
                                    bool sign, bool bip32derivs) const {
     LOCK(cs_wallet);
     // Get all of the previous transactions
     for (size_t i = 0; i < psbtx.tx->vin.size(); ++i) {
         const CTxIn &txin = psbtx.tx->vin[i];
         PSBTInput &input = psbtx.inputs.at(i);
 
         if (PSBTInputSigned(input)) {
             continue;
         }
 
         // If we have no utxo, grab it from the wallet.
         if (input.utxo.IsNull()) {
             const TxId &txid = txin.prevout.GetTxId();
             const auto it = mapWallet.find(txid);
             if (it != mapWallet.end()) {
                 const CWalletTx &wtx = it->second;
                 CTxOut utxo = wtx.tx->vout[txin.prevout.GetN()];
                 // Update UTXOs from the wallet.
                 input.utxo = utxo;
             }
         }
     }
 
     // Fill in information from ScriptPubKeyMans
     for (ScriptPubKeyMan *spk_man : GetAllScriptPubKeyMans()) {
         TransactionError res =
             spk_man->FillPSBT(psbtx, sighash_type, sign, bip32derivs);
         if (res != TransactionError::OK) {
             return res;
         }
     }
 
     // Complete if every input is now signed
     complete = true;
     for (const auto &input : psbtx.inputs) {
         complete &= PSBTInputSigned(input);
     }
 
     return TransactionError::OK;
 }
 
 SigningResult CWallet::SignMessage(const std::string &message,
                                    const PKHash &pkhash,
                                    std::string &str_sig) const {
     SignatureData sigdata;
     CScript script_pub_key = GetScriptForDestination(pkhash);
     for (const auto &spk_man_pair : m_spk_managers) {
         if (spk_man_pair.second->CanProvide(script_pub_key, sigdata)) {
             return spk_man_pair.second->SignMessage(message, pkhash, str_sig);
         }
     }
     return SigningResult::PRIVATE_KEY_NOT_AVAILABLE;
 }
 
 bool CWallet::FundTransaction(CMutableTransaction &tx, Amount &nFeeRet,
                               int &nChangePosInOut, bilingual_str &error,
                               bool lockUnspents,
                               const std::set<int> &setSubtractFeeFromOutputs,
                               CCoinControl coinControl) {
     std::vector<CRecipient> vecSend;
 
     // Turn the txout set into a CRecipient vector.
     for (size_t idx = 0; idx < tx.vout.size(); idx++) {
         const CTxOut &txOut = tx.vout[idx];
         CRecipient recipient = {txOut.scriptPubKey, txOut.nValue,
                                 setSubtractFeeFromOutputs.count(idx) == 1};
         vecSend.push_back(recipient);
     }
 
     coinControl.fAllowOtherInputs = true;
 
     for (const CTxIn &txin : tx.vin) {
         coinControl.Select(txin.prevout);
     }
 
     // Acquire the locks to prevent races to the new locked unspents between the
     // CreateTransaction call and LockCoin calls (when lockUnspents is true).
     LOCK(cs_wallet);
 
     CTransactionRef tx_new;
     if (!CreateTransaction(vecSend, tx_new, nFeeRet, nChangePosInOut, error,
                            coinControl, false)) {
         return false;
     }
 
     if (nChangePosInOut != -1) {
         tx.vout.insert(tx.vout.begin() + nChangePosInOut,
                        tx_new->vout[nChangePosInOut]);
     }
 
     // Copy output sizes from new transaction; they may have had the fee
     // subtracted from them.
     for (size_t idx = 0; idx < tx.vout.size(); idx++) {
         tx.vout[idx].nValue = tx_new->vout[idx].nValue;
     }
 
     // Add new txins (keeping original txin scriptSig/order)
     for (const CTxIn &txin : tx_new->vin) {
         if (!coinControl.IsSelected(txin.prevout)) {
             tx.vin.push_back(txin);
 
             if (lockUnspents) {
                 LockCoin(txin.prevout);
             }
         }
     }
 
     return true;
 }
 
 static bool IsCurrentForAntiFeeSniping(interfaces::Chain &chain,
                                        const BlockHash &block_hash) {
     if (chain.isInitialBlockDownload()) {
         return false;
     }
 
     // in seconds
     constexpr int64_t MAX_ANTI_FEE_SNIPING_TIP_AGE = 8 * 60 * 60;
     int64_t block_time;
     CHECK_NONFATAL(chain.findBlock(block_hash, FoundBlock().time(block_time)));
     if (block_time < (GetTime() - MAX_ANTI_FEE_SNIPING_TIP_AGE)) {
         return false;
     }
     return true;
 }
 
 /**
  * Return a height-based locktime for new transactions (uses the height of the
  * current chain tip unless we are not synced with the current chain
  */
 static uint32_t GetLocktimeForNewTransaction(interfaces::Chain &chain,
                                              const BlockHash &block_hash,
                                              int block_height) {
     uint32_t locktime;
     // Discourage fee sniping.
     //
     // For a large miner the value of the transactions in the best block and
     // the mempool can exceed the cost of deliberately attempting to mine two
     // blocks to orphan the current best block. By setting nLockTime such that
     // only the next block can include the transaction, we discourage this
     // practice as the height restricted and limited blocksize gives miners
     // considering fee sniping fewer options for pulling off this attack.
     //
     // A simple way to think about this is from the wallet's point of view we
     // always want the blockchain to move forward. By setting nLockTime this
     // way we're basically making the statement that we only want this
     // transaction to appear in the next block; we don't want to potentially
     // encourage reorgs by allowing transactions to appear at lower heights
     // than the next block in forks of the best chain.
     //
     // Of course, the subsidy is high enough, and transaction volume low
     // enough, that fee sniping isn't a problem yet, but by implementing a fix
     // now we ensure code won't be written that makes assumptions about
     // nLockTime that preclude a fix later.
     if (IsCurrentForAntiFeeSniping(chain, block_hash)) {
         locktime = block_height;
 
         // Secondly occasionally randomly pick a nLockTime even further back, so
         // that transactions that are delayed after signing for whatever reason,
         // e.g. high-latency mix networks and some CoinJoin implementations,
         // have better privacy.
         if (GetRandInt(10) == 0) {
             locktime = std::max(0, int(locktime) - GetRandInt(100));
         }
     } else {
         // If our chain is lagging behind, we can't discourage fee sniping nor
         // help the privacy of high-latency transactions. To avoid leaking a
         // potentially unique "nLockTime fingerprint", set nLockTime to a
         // constant.
         locktime = 0;
     }
     assert(locktime < LOCKTIME_THRESHOLD);
     return locktime;
 }
 
 OutputType
 CWallet::TransactionChangeType(const std::optional<OutputType> &change_type,
                                const std::vector<CRecipient> &vecSend) {
     // If -changetype is specified, always use that change type.
     if (change_type) {
         return *change_type;
     }
 
     // if m_default_address_type is legacy, use legacy address as change.
     if (m_default_address_type == OutputType::LEGACY) {
         return OutputType::LEGACY;
     }
 
     // else use m_default_address_type for change
     return m_default_address_type;
 }
 
 bool CWallet::CreateTransactionInternal(const std::vector<CRecipient> &vecSend,
                                         CTransactionRef &tx, Amount &nFeeRet,
                                         int &nChangePosInOut,
                                         bilingual_str &error,
                                         const CCoinControl &coin_control,
                                         bool sign) {
     Amount nValue = Amount::zero();
     const OutputType change_type = TransactionChangeType(
         coin_control.m_change_type ? *coin_control.m_change_type
                                    : m_default_change_type,
         vecSend);
     ReserveDestination reservedest(this, change_type);
     int nChangePosRequest = nChangePosInOut;
     unsigned int nSubtractFeeFromAmount = 0;
     for (const auto &recipient : vecSend) {
         if (nValue < Amount::zero() || recipient.nAmount < Amount::zero()) {
             error = _("Transaction amounts must not be negative");
             return false;
         }
 
         nValue += recipient.nAmount;
 
         if (recipient.fSubtractFeeFromAmount) {
             nSubtractFeeFromAmount++;
         }
     }
 
     if (vecSend.empty()) {
         error = _("Transaction must have at least one recipient");
         return false;
     }
 
     CMutableTransaction txNew;
 
     {
         std::set<CInputCoin> setCoins;
         LOCK(cs_wallet);
         txNew.nLockTime = GetLocktimeForNewTransaction(
             chain(), GetLastBlockHash(), GetLastBlockHeight());
         std::vector<COutput> vAvailableCoins;
         AvailableCoins(vAvailableCoins, true, &coin_control);
         // Parameters for coin selection, init with dummy
         CoinSelectionParams coin_selection_params;
 
         // Create change script that will be used if we need change
         // TODO: pass in scriptChange instead of reservedest so
         // change transaction isn't always pay-to-bitcoin-address
         CScript scriptChange;
 
         // coin control: send change to custom address
         if (!boost::get<CNoDestination>(&coin_control.destChange)) {
             scriptChange = GetScriptForDestination(coin_control.destChange);
 
             // no coin control: send change to newly generated address
         } else {
             // Note: We use a new key here to keep it from being obvious
             // which side is the change.
             //  The drawback is that by not reusing a previous key, the
             //  change may be lost if a backup is restored, if the backup
             //  doesn't have the new private key for the change. If we
             //  reused the old key, it would be possible to add code to look
             //  for and rediscover unknown transactions that were written
             //  with keys of ours to recover post-backup change.
 
             // Reserve a new key pair from key pool. If it fails, provide a
             // dummy destination in case we don't need change.
             CTxDestination dest;
             if (!reservedest.GetReservedDestination(dest, true)) {
                 error = _("Transaction needs a change address, but we can't "
                           "generate it. Please call keypoolrefill first.");
             }
 
             scriptChange = GetScriptForDestination(dest);
             // A valid destination implies a change script (and
             // vice-versa). An empty change script will abort later, if the
             // change keypool ran out, but change is required.
             CHECK_NONFATAL(IsValidDestination(dest) != scriptChange.empty());
         }
         CTxOut change_prototype_txout(Amount::zero(), scriptChange);
         coin_selection_params.change_output_size =
             GetSerializeSize(change_prototype_txout);
 
         // Get the fee rate to use effective values in coin selection
         CFeeRate nFeeRateNeeded = GetMinimumFeeRate(*this, coin_control);
         // Do not, ever, assume that it's fine to change the fee rate if the
         // user has explicitly provided one
         if (coin_control.m_feerate &&
             nFeeRateNeeded > *coin_control.m_feerate) {
             error = strprintf(_("Fee rate (%s) is lower than the minimum fee "
                                 "rate setting (%s)"),
                               coin_control.m_feerate->ToString(),
                               nFeeRateNeeded.ToString());
             return false;
         }
 
         nFeeRet = Amount::zero();
         bool pick_new_inputs = true;
         Amount nValueIn = Amount::zero();
 
         // BnB selector is the only selector used when this is true.
         // That should only happen on the first pass through the loop.
         coin_selection_params.use_bnb = true;
         // If we are doing subtract fee from recipient, don't use effective
         // values
         coin_selection_params.m_subtract_fee_outputs =
             nSubtractFeeFromAmount != 0;
         // Start with no fee and loop until there is enough fee
         while (true) {
             nChangePosInOut = nChangePosRequest;
             txNew.vin.clear();
             txNew.vout.clear();
             bool fFirst = true;
 
             Amount nValueToSelect = nValue;
             if (nSubtractFeeFromAmount == 0) {
                 nValueToSelect += nFeeRet;
             }
 
             // vouts to the payees
             if (!coin_selection_params.m_subtract_fee_outputs) {
                 // Static size overhead + outputs vsize. 4 nVersion, 4
                 // nLocktime, 1 input count, 1 output count
                 coin_selection_params.tx_noinputs_size = 10;
             }
             // vouts to the payees
             for (const auto &recipient : vecSend) {
                 CTxOut txout(recipient.nAmount, recipient.scriptPubKey);
 
                 if (recipient.fSubtractFeeFromAmount) {
                     assert(nSubtractFeeFromAmount != 0);
                     // Subtract fee equally from each selected recipient.
                     txout.nValue -= nFeeRet / int(nSubtractFeeFromAmount);
 
                     // First receiver pays the remainder not divisible by output
                     // count.
                     if (fFirst) {
                         fFirst = false;
                         txout.nValue -= nFeeRet % int(nSubtractFeeFromAmount);
                     }
                 }
 
                 // Include the fee cost for outputs. Note this is only used for
                 // BnB right now
                 if (!coin_selection_params.m_subtract_fee_outputs) {
                     coin_selection_params.tx_noinputs_size +=
                         ::GetSerializeSize(txout, PROTOCOL_VERSION);
                 }
 
                 if (IsDust(txout, chain().relayDustFee())) {
                     if (recipient.fSubtractFeeFromAmount &&
                         nFeeRet > Amount::zero()) {
                         if (txout.nValue < Amount::zero()) {
                             error = _("The transaction amount is too small to "
                                       "pay the fee");
                         } else {
                             error = _("The transaction amount is too small to "
                                       "send after the fee has been deducted");
                         }
                     } else {
                         error = _("Transaction amount too small");
                     }
 
                     return false;
                 }
 
                 txNew.vout.push_back(txout);
             }
 
             // Choose coins to use
             bool bnb_used = false;
             if (pick_new_inputs) {
                 nValueIn = Amount::zero();
                 setCoins.clear();
                 int change_spend_size = CalculateMaximumSignedInputSize(
                     change_prototype_txout, this);
                 // If the wallet doesn't know how to sign change output, assume
                 // p2pkh as lower-bound to allow BnB to do it's thing
                 if (change_spend_size == -1) {
                     coin_selection_params.change_spend_size =
                         DUMMY_P2PKH_INPUT_SIZE;
                 } else {
                     coin_selection_params.change_spend_size =
                         size_t(change_spend_size);
                 }
                 coin_selection_params.effective_fee = nFeeRateNeeded;
                 if (!SelectCoins(vAvailableCoins, nValueToSelect, setCoins,
                                  nValueIn, coin_control, coin_selection_params,
                                  bnb_used)) {
                     // If BnB was used, it was the first pass. No longer the
                     // first pass and continue loop with knapsack.
                     if (bnb_used) {
                         coin_selection_params.use_bnb = false;
                         continue;
                     } else {
                         error = _("Insufficient funds");
                         return false;
                     }
                 }
             } else {
                 bnb_used = false;
             }
 
             const Amount nChange = nValueIn - nValueToSelect;
             if (nChange > Amount::zero()) {
                 // Fill a vout to ourself.
                 CTxOut newTxOut(nChange, scriptChange);
 
                 // Never create dust outputs; if we would, just add the dust to
                 // the fee.
                 // The nChange when BnB is used is always going to go to fees.
                 if (IsDust(newTxOut, chain().relayDustFee()) || bnb_used) {
                     nChangePosInOut = -1;
                     nFeeRet += nChange;
                 } else {
                     if (nChangePosInOut == -1) {
                         // Insert change txn at random position:
                         nChangePosInOut = GetRandInt(txNew.vout.size() + 1);
                     } else if ((unsigned int)nChangePosInOut >
                                txNew.vout.size()) {
                         error = _("Change index out of range");
                         return false;
                     }
 
                     std::vector<CTxOut>::iterator position =
                         txNew.vout.begin() + nChangePosInOut;
                     txNew.vout.insert(position, newTxOut);
                 }
             } else {
                 nChangePosInOut = -1;
             }
 
             // Dummy fill vin for maximum size estimation
             //
             for (const auto &coin : setCoins) {
                 txNew.vin.push_back(CTxIn(coin.outpoint, CScript()));
             }
 
             CTransaction txNewConst(txNew);
             int nBytes = CalculateMaximumSignedTxSize(
                 txNewConst, this, coin_control.fAllowWatchOnly);
             if (nBytes < 0) {
                 error = _("Signing transaction failed");
                 return false;
             }
 
             Amount nFeeNeeded = GetMinimumFee(*this, nBytes, coin_control);
 
             if (nFeeRet >= nFeeNeeded) {
                 // Reduce fee to only the needed amount if possible. This
                 // prevents potential overpayment in fees if the coins selected
                 // to meet nFeeNeeded result in a transaction that requires less
                 // fee than the prior iteration.
 
                 // If we have no change and a big enough excess fee, then try to
                 // construct transaction again only without picking new inputs.
                 // We now know we only need the smaller fee (because of reduced
                 // tx size) and so we should add a change output. Only try this
                 // once.
                 if (nChangePosInOut == -1 && nSubtractFeeFromAmount == 0 &&
                     pick_new_inputs) {
                     // Add 2 as a buffer in case increasing # of outputs changes
                     // compact size
                     unsigned int tx_size_with_change =
                         nBytes + coin_selection_params.change_output_size + 2;
                     Amount fee_needed_with_change =
                         GetMinimumFee(*this, tx_size_with_change, coin_control);
                     Amount minimum_value_for_change = GetDustThreshold(
                         change_prototype_txout, chain().relayDustFee());
                     if (nFeeRet >=
                         fee_needed_with_change + minimum_value_for_change) {
                         pick_new_inputs = false;
                         nFeeRet = fee_needed_with_change;
                         continue;
                     }
                 }
 
                 // If we have change output already, just increase it
                 if (nFeeRet > nFeeNeeded && nChangePosInOut != -1 &&
                     nSubtractFeeFromAmount == 0) {
                     Amount extraFeePaid = nFeeRet - nFeeNeeded;
                     std::vector<CTxOut>::iterator change_position =
                         txNew.vout.begin() + nChangePosInOut;
                     change_position->nValue += extraFeePaid;
                     nFeeRet -= extraFeePaid;
                 }
 
                 // Done, enough fee included.
                 break;
             } else if (!pick_new_inputs) {
                 // This shouldn't happen, we should have had enough excess fee
                 // to pay for the new output and still meet nFeeNeeded.
                 // Or we should have just subtracted fee from recipients and
                 // nFeeNeeded should not have changed.
                 error = _("Transaction fee and change calculation failed");
                 return false;
             }
 
             // Try to reduce change to include necessary fee.
             if (nChangePosInOut != -1 && nSubtractFeeFromAmount == 0) {
                 Amount additionalFeeNeeded = nFeeNeeded - nFeeRet;
                 std::vector<CTxOut>::iterator change_position =
                     txNew.vout.begin() + nChangePosInOut;
                 // Only reduce change if remaining amount is still a large
                 // enough output.
                 if (change_position->nValue >=
                     MIN_FINAL_CHANGE + additionalFeeNeeded) {
                     change_position->nValue -= additionalFeeNeeded;
                     nFeeRet += additionalFeeNeeded;
                     // Done, able to increase fee from change.
                     break;
                 }
             }
 
             // If subtracting fee from recipients, we now know what fee we
             // need to subtract, we have no reason to reselect inputs.
             if (nSubtractFeeFromAmount > 0) {
                 pick_new_inputs = false;
             }
 
             // Include more fee and try again.
             nFeeRet = nFeeNeeded;
             coin_selection_params.use_bnb = false;
             continue;
         }
 
         // Give up if change keypool ran out and change is required
         if (scriptChange.empty() && nChangePosInOut != -1) {
             return false;
         }
 
         // Shuffle selected coins and fill in final vin
         txNew.vin.clear();
         std::vector<CInputCoin> selected_coins(setCoins.begin(),
                                                setCoins.end());
         Shuffle(selected_coins.begin(), selected_coins.end(),
                 FastRandomContext());
 
         // Note how the sequence number is set to non-maxint so that
         // the nLockTime set above actually works.
         for (const auto &coin : selected_coins) {
             txNew.vin.push_back(
                 CTxIn(coin.outpoint, CScript(),
                       std::numeric_limits<uint32_t>::max() - 1));
         }
 
         if (sign && !SignTransaction(txNew)) {
             error = _("Signing transaction failed");
             return false;
         }
 
         // Return the constructed transaction data.
         tx = MakeTransactionRef(std::move(txNew));
 
         // Limit size.
         if (tx->GetTotalSize() > MAX_STANDARD_TX_SIZE) {
             error = _("Transaction too large");
             return false;
         }
     }
 
     if (nFeeRet > m_default_max_tx_fee) {
         error = TransactionErrorString(TransactionError::MAX_FEE_EXCEEDED);
         return false;
     }
 
     if (gArgs.GetBoolArg("-walletrejectlongchains",
                          DEFAULT_WALLET_REJECT_LONG_CHAINS)) {
         // Lastly, ensure this tx will pass the mempool's chain limits
         if (!chain().checkChainLimits(tx)) {
             error = _("Transaction has too long of a mempool chain");
             return false;
         }
     }
 
     // Before we return success, we assume any change key will be used to
     // prevent accidental re-use.
     reservedest.KeepDestination();
 
     return true;
 }
 
 bool CWallet::CreateTransaction(const std::vector<CRecipient> &vecSend,
                                 CTransactionRef &tx, Amount &nFeeRet,
                                 int &nChangePosInOut, bilingual_str &error,
                                 const CCoinControl &coin_control, bool sign) {
     int nChangePosIn = nChangePosInOut;
     CTransactionRef tx2 = tx;
     bool res = CreateTransactionInternal(vecSend, tx, nFeeRet, nChangePosInOut,
                                          error, coin_control, sign);
     // try with avoidpartialspends unless it's enabled already
     if (res &&
         nFeeRet >
             Amount::zero() /* 0 means non-functional fee rate estimation */
         && m_max_aps_fee > (-1 * SATOSHI) &&
         !coin_control.m_avoid_partial_spends) {
         CCoinControl tmp_cc = coin_control;
         tmp_cc.m_avoid_partial_spends = true;
         Amount nFeeRet2;
         int nChangePosInOut2 = nChangePosIn;
         // fired and forgotten; if an error occurs, we discard the results
         bilingual_str error2;
         if (CreateTransactionInternal(vecSend, tx2, nFeeRet2, nChangePosInOut2,
                                       error2, tmp_cc, sign)) {
             // if fee of this alternative one is within the range of the max
             // fee, we use this one
             const bool use_aps = nFeeRet2 <= nFeeRet + m_max_aps_fee;
             WalletLogPrintf(
                 "Fee non-grouped = %lld, grouped = %lld, using %s\n", nFeeRet,
                 nFeeRet2, use_aps ? "grouped" : "non-grouped");
             if (use_aps) {
                 tx = tx2;
                 nFeeRet = nFeeRet2;
                 nChangePosInOut = nChangePosInOut2;
             }
         }
     }
     return res;
 }
 
 void CWallet::CommitTransaction(
     CTransactionRef tx, mapValue_t mapValue,
     std::vector<std::pair<std::string, std::string>> orderForm) {
     LOCK(cs_wallet);
 
     WalletLogPrintfToBeContinued("CommitTransaction:\n%s", tx->ToString());
 
     // Add tx to wallet, because if it has change it's also ours, otherwise just
     // for transaction history.
     AddToWallet(tx, {}, [&](CWalletTx &wtx, bool new_tx) {
         CHECK_NONFATAL(wtx.mapValue.empty());
         CHECK_NONFATAL(wtx.vOrderForm.empty());
         wtx.mapValue = std::move(mapValue);
         wtx.vOrderForm = std::move(orderForm);
         wtx.fTimeReceivedIsTxTime = true;
         wtx.fFromMe = true;
         return true;
     });
 
     // Notify that old coins are spent.
     for (const CTxIn &txin : tx->vin) {
         CWalletTx &coin = mapWallet.at(txin.prevout.GetTxId());
         coin.MarkDirty();
         NotifyTransactionChanged(this, coin.GetId(), CT_UPDATED);
     }
 
     // Get the inserted-CWalletTx from mapWallet so that the
     // fInMempool flag is cached properly
     CWalletTx &wtx = mapWallet.at(tx->GetId());
 
     if (!fBroadcastTransactions) {
         // Don't submit tx to the mempool
         return;
     }
 
     std::string err_string;
     if (!wtx.SubmitMemoryPoolAndRelay(err_string, true)) {
         WalletLogPrintf("CommitTransaction(): Transaction cannot be broadcast "
                         "immediately, %s\n",
                         err_string);
         // TODO: if we expect the failure to be long term or permanent, instead
         // delete wtx from the wallet and return failure.
     }
 }
 
 DBErrors CWallet::LoadWallet(bool &fFirstRunRet) {
     LOCK(cs_wallet);
 
     fFirstRunRet = false;
     DBErrors nLoadWalletRet = WalletBatch(*database, "cr+").LoadWallet(this);
     if (nLoadWalletRet == DBErrors::NEED_REWRITE) {
         if (database->Rewrite("\x04pool")) {
             for (const auto &spk_man_pair : m_spk_managers) {
                 spk_man_pair.second->RewriteDB();
             }
         }
     }
 
     // This wallet is in its first run if there are no ScriptPubKeyMans and it
     // isn't blank or no privkeys
     fFirstRunRet = m_spk_managers.empty() &&
                    !IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS) &&
                    !IsWalletFlagSet(WALLET_FLAG_BLANK_WALLET);
     if (fFirstRunRet) {
         assert(m_external_spk_managers.empty());
         assert(m_internal_spk_managers.empty());
     }
 
     if (nLoadWalletRet != DBErrors::LOAD_OK) {
         return nLoadWalletRet;
     }
 
     return DBErrors::LOAD_OK;
 }
 
 DBErrors CWallet::ZapSelectTx(std::vector<TxId> &txIdsIn,
                               std::vector<TxId> &txIdsOut) {
     AssertLockHeld(cs_wallet);
     DBErrors nZapSelectTxRet =
         WalletBatch(*database, "cr+").ZapSelectTx(txIdsIn, txIdsOut);
     for (const TxId &txid : txIdsOut) {
         const auto &it = mapWallet.find(txid);
         wtxOrdered.erase(it->second.m_it_wtxOrdered);
         for (const auto &txin : it->second.tx->vin) {
             mapTxSpends.erase(txin.prevout);
         }
         mapWallet.erase(it);
         NotifyTransactionChanged(this, txid, CT_DELETED);
     }
 
     if (nZapSelectTxRet == DBErrors::NEED_REWRITE) {
         if (database->Rewrite("\x04pool")) {
             for (const auto &spk_man_pair : m_spk_managers) {
                 spk_man_pair.second->RewriteDB();
             }
         }
     }
 
     if (nZapSelectTxRet != DBErrors::LOAD_OK) {
         return nZapSelectTxRet;
     }
 
     MarkDirty();
 
     return DBErrors::LOAD_OK;
 }
 
 DBErrors CWallet::ZapWalletTx(std::list<CWalletTx> &vWtx) {
     DBErrors nZapWalletTxRet = WalletBatch(*database, "cr+").ZapWalletTx(vWtx);
     if (nZapWalletTxRet == DBErrors::NEED_REWRITE) {
         if (database->Rewrite("\x04pool")) {
             for (const auto &spk_man_pair : m_spk_managers) {
                 spk_man_pair.second->RewriteDB();
             }
         }
     }
 
     if (nZapWalletTxRet != DBErrors::LOAD_OK) {
         return nZapWalletTxRet;
     }
 
     return DBErrors::LOAD_OK;
 }
 
 bool CWallet::SetAddressBookWithDB(WalletBatch &batch,
                                    const CTxDestination &address,
                                    const std::string &strName,
                                    const std::string &strPurpose) {
     bool fUpdated = false;
     bool is_mine;
     {
         LOCK(cs_wallet);
         std::map<CTxDestination, CAddressBookData>::iterator mi =
             m_address_book.find(address);
         fUpdated = (mi != m_address_book.end() && !mi->second.IsChange());
         m_address_book[address].SetLabel(strName);
         // Update purpose only if requested.
         if (!strPurpose.empty()) {
             m_address_book[address].purpose = strPurpose;
         }
         is_mine = IsMine(address) != ISMINE_NO;
     }
 
     NotifyAddressBookChanged(this, address, strName, is_mine, strPurpose,
                              (fUpdated ? CT_UPDATED : CT_NEW));
     if (!strPurpose.empty() && !batch.WritePurpose(address, strPurpose)) {
         return false;
     }
     return batch.WriteName(address, strName);
 }
 
 bool CWallet::SetAddressBook(const CTxDestination &address,
                              const std::string &strName,
                              const std::string &strPurpose) {
     WalletBatch batch(*database);
     return SetAddressBookWithDB(batch, address, strName, strPurpose);
 }
 
 bool CWallet::DelAddressBook(const CTxDestination &address) {
     bool is_mine;
     {
         LOCK(cs_wallet);
         // If we want to delete receiving addresses, we need to take care that
         // DestData "used" (and possibly newer DestData) gets preserved (and the
         // "deleted" address transformed into a change entry instead of actually
         // being deleted)
         // NOTE: This isn't a problem for sending addresses because they never
         // have any DestData yet! When adding new DestData, it should be
         // considered here whether to retain or delete it (or move it?).
         if (IsMine(address)) {
             WalletLogPrintf(
                 "%s called with IsMine address, NOT SUPPORTED. Please "
                 "report this bug! %s\n",
                 __func__, PACKAGE_BUGREPORT);
             return false;
         }
         // Delete destdata tuples associated with address
         for (const std::pair<const std::string, std::string> &item :
              m_address_book[address].destdata) {
             WalletBatch(*database).EraseDestData(address, item.first);
         }
         m_address_book.erase(address);
         is_mine = IsMine(address) != ISMINE_NO;
     }
 
     NotifyAddressBookChanged(this, address, "", is_mine, "", CT_DELETED);
 
     WalletBatch(*database).ErasePurpose(address);
     return WalletBatch(*database).EraseName(address);
 }
 
 size_t CWallet::KeypoolCountExternalKeys() const {
     AssertLockHeld(cs_wallet);
 
     unsigned int count = 0;
     for (auto spk_man : GetActiveScriptPubKeyMans()) {
         count += spk_man->KeypoolCountExternalKeys();
     }
 
     return count;
 }
 
 unsigned int CWallet::GetKeyPoolSize() const {
     AssertLockHeld(cs_wallet);
 
     unsigned int count = 0;
     for (auto spk_man : GetActiveScriptPubKeyMans()) {
         count += spk_man->GetKeyPoolSize();
     }
     return count;
 }
 
 bool CWallet::TopUpKeyPool(unsigned int kpSize) {
     LOCK(cs_wallet);
     bool res = true;
     for (auto spk_man : GetActiveScriptPubKeyMans()) {
         res &= spk_man->TopUp(kpSize);
     }
     return res;
 }
 
 bool CWallet::GetNewDestination(const OutputType type, const std::string label,
                                 CTxDestination &dest, std::string &error) {
     LOCK(cs_wallet);
     error.clear();
     bool result = false;
     auto spk_man = GetScriptPubKeyMan(type, false /* internal */);
     if (spk_man) {
         spk_man->TopUp();
         result = spk_man->GetNewDestination(type, dest, error);
     } else {
         error = strprintf("Error: No %s addresses available.",
                           FormatOutputType(type));
     }
     if (result) {
         SetAddressBook(dest, label, "receive");
     }
 
     return result;
 }
 
 bool CWallet::GetNewChangeDestination(const OutputType type,
                                       CTxDestination &dest,
                                       std::string &error) {
     LOCK(cs_wallet);
     error.clear();
 
     ReserveDestination reservedest(this, type);
     if (!reservedest.GetReservedDestination(dest, true)) {
         error = _("Error: Keypool ran out, please call keypoolrefill first")
                     .translated;
         return false;
     }
 
     reservedest.KeepDestination();
     return true;
 }
 
 int64_t CWallet::GetOldestKeyPoolTime() const {
     LOCK(cs_wallet);
     int64_t oldestKey = std::numeric_limits<int64_t>::max();
     for (const auto &spk_man_pair : m_spk_managers) {
         oldestKey =
             std::min(oldestKey, spk_man_pair.second->GetOldestKeyPoolTime());
     }
     return oldestKey;
 }
 
 void CWallet::MarkDestinationsDirty(
     const std::set<CTxDestination> &destinations) {
     for (auto &entry : mapWallet) {
         CWalletTx &wtx = entry.second;
         if (wtx.m_is_cache_empty) {
             continue;
         }
 
         for (size_t i = 0; i < wtx.tx->vout.size(); i++) {
             CTxDestination dst;
 
             if (ExtractDestination(wtx.tx->vout[i].scriptPubKey, dst) &&
                 destinations.count(dst)) {
                 wtx.MarkDirty();
                 break;
             }
         }
     }
 }
 
 std::map<CTxDestination, Amount> CWallet::GetAddressBalances() const {
     std::map<CTxDestination, Amount> balances;
 
     LOCK(cs_wallet);
     std::set<TxId> trusted_parents;
     for (const auto &walletEntry : mapWallet) {
         const CWalletTx &wtx = walletEntry.second;
 
         if (!IsTrusted(wtx, trusted_parents)) {
             continue;
         }
 
         if (wtx.IsImmatureCoinBase()) {
             continue;
         }
 
         int nDepth = wtx.GetDepthInMainChain();
         if (nDepth < (wtx.IsFromMe(ISMINE_ALL) ? 0 : 1)) {
             continue;
         }
 
         for (uint32_t i = 0; i < wtx.tx->vout.size(); i++) {
             CTxDestination addr;
             if (!IsMine(wtx.tx->vout[i])) {
                 continue;
             }
 
             if (!ExtractDestination(wtx.tx->vout[i].scriptPubKey, addr)) {
                 continue;
             }
 
             Amount n = IsSpent(COutPoint(walletEntry.first, i))
                            ? Amount::zero()
                            : wtx.tx->vout[i].nValue;
             balances[addr] += n;
         }
     }
 
     return balances;
 }
 
 std::set<std::set<CTxDestination>> CWallet::GetAddressGroupings() const {
     AssertLockHeld(cs_wallet);
     std::set<std::set<CTxDestination>> groupings;
     std::set<CTxDestination> grouping;
 
     for (const auto &walletEntry : mapWallet) {
         const CWalletTx &wtx = walletEntry.second;
 
         if (wtx.tx->vin.size() > 0) {
             bool any_mine = false;
             // Group all input addresses with each other.
             for (const auto &txin : wtx.tx->vin) {
                 CTxDestination address;
                 // If this input isn't mine, ignore it.
                 if (!IsMine(txin)) {
                     continue;
                 }
 
                 if (!ExtractDestination(mapWallet.at(txin.prevout.GetTxId())
                                             .tx->vout[txin.prevout.GetN()]
                                             .scriptPubKey,
                                         address)) {
                     continue;
                 }
 
                 grouping.insert(address);
                 any_mine = true;
             }
 
             // Group change with input addresses.
             if (any_mine) {
                 for (const auto &txout : wtx.tx->vout) {
                     if (IsChange(txout)) {
                         CTxDestination txoutAddr;
                         if (!ExtractDestination(txout.scriptPubKey,
                                                 txoutAddr)) {
                             continue;
                         }
 
                         grouping.insert(txoutAddr);
                     }
                 }
             }
 
             if (grouping.size() > 0) {
                 groupings.insert(grouping);
                 grouping.clear();
             }
         }
 
         // Group lone addrs by themselves.
         for (const auto &txout : wtx.tx->vout) {
             if (IsMine(txout)) {
                 CTxDestination address;
                 if (!ExtractDestination(txout.scriptPubKey, address)) {
                     continue;
                 }
 
                 grouping.insert(address);
                 groupings.insert(grouping);
                 grouping.clear();
             }
         }
     }
 
     // A set of pointers to groups of addresses.
     std::set<std::set<CTxDestination> *> uniqueGroupings;
     // Map addresses to the unique group containing it.
     std::map<CTxDestination, std::set<CTxDestination> *> setmap;
     for (std::set<CTxDestination> _grouping : groupings) {
         // Make a set of all the groups hit by this new group.
         std::set<std::set<CTxDestination> *> hits;
         std::map<CTxDestination, std::set<CTxDestination> *>::iterator it;
         for (const CTxDestination &address : _grouping) {
             if ((it = setmap.find(address)) != setmap.end()) {
                 hits.insert((*it).second);
             }
         }
 
         // Merge all hit groups into a new single group and delete old groups.
         std::set<CTxDestination> *merged =
             new std::set<CTxDestination>(_grouping);
         for (std::set<CTxDestination> *hit : hits) {
             merged->insert(hit->begin(), hit->end());
             uniqueGroupings.erase(hit);
             delete hit;
         }
         uniqueGroupings.insert(merged);
 
         // Update setmap.
         for (const CTxDestination &element : *merged) {
             setmap[element] = merged;
         }
     }
 
     std::set<std::set<CTxDestination>> ret;
     for (const std::set<CTxDestination> *uniqueGrouping : uniqueGroupings) {
         ret.insert(*uniqueGrouping);
         delete uniqueGrouping;
     }
 
     return ret;
 }
 
 std::set<CTxDestination>
 CWallet::GetLabelAddresses(const std::string &label) const {
     LOCK(cs_wallet);
     std::set<CTxDestination> result;
     for (const std::pair<const CTxDestination, CAddressBookData> &item :
          m_address_book) {
         if (item.second.IsChange()) {
             continue;
         }
         const CTxDestination &address = item.first;
         const std::string &strName = item.second.GetLabel();
         if (strName == label) {
             result.insert(address);
         }
     }
 
     return result;
 }
 
 bool ReserveDestination::GetReservedDestination(CTxDestination &dest,
                                                 bool internal) {
     m_spk_man = pwallet->GetScriptPubKeyMan(type, internal);
     if (!m_spk_man) {
         return false;
     }
 
     if (nIndex == -1) {
         m_spk_man->TopUp();
 
         CKeyPool keypool;
         if (!m_spk_man->GetReservedDestination(type, internal, address, nIndex,
                                                keypool)) {
             return false;
         }
         fInternal = keypool.fInternal;
     }
     dest = address;
     return true;
 }
 
 void ReserveDestination::KeepDestination() {
     if (nIndex != -1) {
         m_spk_man->KeepDestination(nIndex, type);
     }
 
     nIndex = -1;
     address = CNoDestination();
 }
 
 void ReserveDestination::ReturnDestination() {
     if (nIndex != -1) {
         m_spk_man->ReturnDestination(nIndex, fInternal, address);
     }
     nIndex = -1;
     address = CNoDestination();
 }
 
 void CWallet::LockCoin(const COutPoint &output) {
     AssertLockHeld(cs_wallet);
     setLockedCoins.insert(output);
 }
 
 void CWallet::UnlockCoin(const COutPoint &output) {
     AssertLockHeld(cs_wallet);
     setLockedCoins.erase(output);
 }
 
 void CWallet::UnlockAllCoins() {
     AssertLockHeld(cs_wallet);
     setLockedCoins.clear();
 }
 
 bool CWallet::IsLockedCoin(const COutPoint &outpoint) const {
     AssertLockHeld(cs_wallet);
 
     return setLockedCoins.count(outpoint) > 0;
 }
 
 void CWallet::ListLockedCoins(std::vector<COutPoint> &vOutpts) const {
     AssertLockHeld(cs_wallet);
     for (COutPoint outpoint : setLockedCoins) {
         vOutpts.push_back(outpoint);
     }
 }
 
 /** @} */ // end of Actions
 
 void CWallet::GetKeyBirthTimes(std::map<CKeyID, int64_t> &mapKeyBirth) const {
     AssertLockHeld(cs_wallet);
     mapKeyBirth.clear();
 
     LegacyScriptPubKeyMan *spk_man = GetLegacyScriptPubKeyMan();
     assert(spk_man != nullptr);
     LOCK(spk_man->cs_KeyStore);
 
     // Get birth times for keys with metadata.
     for (const auto &entry : spk_man->mapKeyMetadata) {
         if (entry.second.nCreateTime) {
             mapKeyBirth[entry.first] = entry.second.nCreateTime;
         }
     }
 
     // map in which we'll infer heights of other keys
     std::map<CKeyID, const CWalletTx::Confirmation *> mapKeyFirstBlock;
     CWalletTx::Confirmation max_confirm;
     // the tip can be reorganized; use a 144-block safety margin
     max_confirm.block_height =
         GetLastBlockHeight() > 144 ? GetLastBlockHeight() - 144 : 0;
     CHECK_NONFATAL(chain().findAncestorByHeight(
         GetLastBlockHash(), max_confirm.block_height,
         FoundBlock().hash(max_confirm.hashBlock)));
     for (const CKeyID &keyid : spk_man->GetKeys()) {
         if (mapKeyBirth.count(keyid) == 0) {
             mapKeyFirstBlock[keyid] = &max_confirm;
         }
     }
 
     // If there are no such keys, we're done.
     if (mapKeyFirstBlock.empty()) {
         return;
     }
 
     // Find first block that affects those keys, if there are any left.
     for (const auto &entry : mapWallet) {
         // iterate over all wallet transactions...
         const CWalletTx &wtx = entry.second;
         if (wtx.m_confirm.status == CWalletTx::CONFIRMED) {
             // ... which are already in a block
             for (const CTxOut &txout : wtx.tx->vout) {
                 // Iterate over all their outputs...
                 for (const auto &keyid :
                      GetAffectedKeys(txout.scriptPubKey, *spk_man)) {
                     // ... and all their affected keys.
                     auto rit = mapKeyFirstBlock.find(keyid);
                     if (rit != mapKeyFirstBlock.end() &&
                         wtx.m_confirm.block_height <
                             rit->second->block_height) {
                         rit->second = &wtx.m_confirm;
                     }
                 }
             }
         }
     }
 
     // Extract block timestamps for those keys.
     for (const auto &entry : mapKeyFirstBlock) {
         int64_t block_time;
         CHECK_NONFATAL(chain().findBlock(entry.second->hashBlock,
                                          FoundBlock().time(block_time)));
         // block times can be 2h off
         mapKeyBirth[entry.first] = block_time - TIMESTAMP_WINDOW;
     }
 }
 
 /**
  * Compute smart timestamp for a transaction being added to the wallet.
  *
  * Logic:
  * - If sending a transaction, assign its timestamp to the current time.
  * - If receiving a transaction outside a block, assign its timestamp to the
  *   current time.
  * - If receiving a block with a future timestamp, assign all its (not already
  *   known) transactions' timestamps to the current time.
  * - If receiving a block with a past timestamp, before the most recent known
  *   transaction (that we care about), assign all its (not already known)
  *   transactions' timestamps to the same timestamp as that most-recent-known
  *   transaction.
  * - If receiving a block with a past timestamp, but after the most recent known
  *   transaction, assign all its (not already known) transactions' timestamps to
  *   the block time.
  *
  * For more information see CWalletTx::nTimeSmart,
  * https://bitcointalk.org/?topic=54527, or
  * https://github.com/bitcoin/bitcoin/pull/1393.
  */
 unsigned int CWallet::ComputeTimeSmart(const CWalletTx &wtx) const {
     unsigned int nTimeSmart = wtx.nTimeReceived;
     if (!wtx.isUnconfirmed() && !wtx.isAbandoned()) {
         int64_t blocktime;
         if (chain().findBlock(wtx.m_confirm.hashBlock,
                               FoundBlock().time(blocktime))) {
             int64_t latestNow = wtx.nTimeReceived;
             int64_t latestEntry = 0;
 
             // Tolerate times up to the last timestamp in the wallet not more
             // than 5 minutes into the future
             int64_t latestTolerated = latestNow + 300;
             const TxItems &txOrdered = wtxOrdered;
             for (auto it = txOrdered.rbegin(); it != txOrdered.rend(); ++it) {
                 CWalletTx *const pwtx = it->second;
                 if (pwtx == &wtx) {
                     continue;
                 }
                 int64_t nSmartTime;
                 nSmartTime = pwtx->nTimeSmart;
                 if (!nSmartTime) {
                     nSmartTime = pwtx->nTimeReceived;
                 }
                 if (nSmartTime <= latestTolerated) {
                     latestEntry = nSmartTime;
                     if (nSmartTime > latestNow) {
                         latestNow = nSmartTime;
                     }
                     break;
                 }
             }
 
             nTimeSmart = std::max(latestEntry, std::min(blocktime, latestNow));
         } else {
             WalletLogPrintf("%s: found %s in block %s not in index\n", __func__,
                             wtx.GetId().ToString(),
                             wtx.m_confirm.hashBlock.ToString());
         }
     }
     return nTimeSmart;
 }
 
 bool CWallet::AddDestData(WalletBatch &batch, const CTxDestination &dest,
                           const std::string &key, const std::string &value) {
     if (boost::get<CNoDestination>(&dest)) {
         return false;
     }
 
     m_address_book[dest].destdata.insert(std::make_pair(key, value));
     return batch.WriteDestData(dest, key, value);
 }
 
 bool CWallet::EraseDestData(WalletBatch &batch, const CTxDestination &dest,
                             const std::string &key) {
     if (!m_address_book[dest].destdata.erase(key)) {
         return false;
     }
 
     return batch.EraseDestData(dest, key);
 }
 
 void CWallet::LoadDestData(const CTxDestination &dest, const std::string &key,
                            const std::string &value) {
     m_address_book[dest].destdata.insert(std::make_pair(key, value));
 }
 
 bool CWallet::GetDestData(const CTxDestination &dest, const std::string &key,
                           std::string *value) const {
     std::map<CTxDestination, CAddressBookData>::const_iterator i =
         m_address_book.find(dest);
     if (i != m_address_book.end()) {
         CAddressBookData::StringMap::const_iterator j =
             i->second.destdata.find(key);
         if (j != i->second.destdata.end()) {
             if (value) {
                 *value = j->second;
             }
 
             return true;
         }
     }
     return false;
 }
 
 std::vector<std::string>
 CWallet::GetDestValues(const std::string &prefix) const {
     std::vector<std::string> values;
     for (const auto &address : m_address_book) {
         for (const auto &data : address.second.destdata) {
             if (!data.first.compare(0, prefix.size(), prefix)) {
                 values.emplace_back(data.second);
             }
         }
     }
     return values;
 }
 
 bool CWallet::Verify(const CChainParams &chainParams, interfaces::Chain &chain,
                      const WalletLocation &location,
                      bilingual_str &error_string,
                      std::vector<bilingual_str> &warnings) {
     // Do some checking on wallet path. It should be either a:
     //
     // 1. Path where a directory can be created.
     // 2. Path to an existing directory.
     // 3. Path to a symlink to a directory.
     // 4. For backwards compatibility, the name of a data file in -walletdir.
     LOCK(cs_wallets);
     const fs::path &wallet_path = location.GetPath();
     fs::file_type path_type = fs::symlink_status(wallet_path).type();
     if (!(path_type == fs::file_not_found || path_type == fs::directory_file ||
           (path_type == fs::symlink_file && fs::is_directory(wallet_path)) ||
           (path_type == fs::regular_file &&
            fs::path(location.GetName()).filename() == location.GetName()))) {
         error_string = Untranslated(
             strprintf("Invalid -wallet path '%s'. -wallet path should point to "
                       "a directory where wallet.dat and "
                       "database/log.?????????? files can be stored, a location "
                       "where such a directory could be created, "
                       "or (for backwards compatibility) the name of an "
                       "existing data file in -walletdir (%s)",
                       location.GetName(), GetWalletDir()));
         return false;
     }
 
     // Make sure that the wallet path doesn't clash with an existing wallet path
     if (IsWalletLoaded(wallet_path)) {
         error_string = Untranslated(strprintf(
             "Error loading wallet %s. Duplicate -wallet filename specified.",
             location.GetName()));
         return false;
     }
 
     // Keep same database environment instance across Verify/Recover calls
     // below.
     std::unique_ptr<WalletDatabase> database =
         CreateWalletDatabase(wallet_path);
 
     try {
         return database->Verify(error_string);
     } catch (const fs::filesystem_error &e) {
         error_string = Untranslated(
             strprintf("Error loading wallet %s. %s", location.GetName(),
                       fsbridge::get_filesystem_error_message(e)));
         return false;
     }
 }
 
 std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(
     const CChainParams &chainParams, interfaces::Chain &chain,
     const WalletLocation &location, bilingual_str &error,
     std::vector<bilingual_str> &warnings, uint64_t wallet_creation_flags) {
     const std::string walletFile =
         WalletDataFilePath(location.GetPath()).string();
 
     // Needed to restore wallet transaction meta data after -zapwallettxes
     std::list<CWalletTx> vWtx;
 
     if (gArgs.GetBoolArg("-zapwallettxes", false)) {
         chain.initMessage(
             _("Zapping all transactions from wallet...").translated);
 
         std::unique_ptr<CWallet> tempWallet = std::make_unique<CWallet>(
             &chain, location, CreateWalletDatabase(location.GetPath()));
         DBErrors nZapWalletRet = tempWallet->ZapWalletTx(vWtx);
         if (nZapWalletRet != DBErrors::LOAD_OK) {
             error =
                 strprintf(_("Error loading %s: Wallet corrupted"), walletFile);
             return nullptr;
         }
     }
 
     chain.initMessage(_("Loading wallet...").translated);
 
     int64_t nStart = GetTimeMillis();
     bool fFirstRun = true;
     // TODO: Can't use std::make_shared because we need a custom deleter but
     // should be possible to use std::allocate_shared.
     std::shared_ptr<CWallet> walletInstance(
         new CWallet(&chain, location, CreateWalletDatabase(location.GetPath())),
         ReleaseWallet);
     DBErrors nLoadWalletRet = walletInstance->LoadWallet(fFirstRun);
     if (nLoadWalletRet != DBErrors::LOAD_OK) {
         if (nLoadWalletRet == DBErrors::CORRUPT) {
             error =
                 strprintf(_("Error loading %s: Wallet corrupted"), walletFile);
             return nullptr;
         }
 
         if (nLoadWalletRet == DBErrors::NONCRITICAL_ERROR) {
             warnings.push_back(
                 strprintf(_("Error reading %s! All keys read correctly, but "
                             "transaction data or address book entries might be "
                             "missing or incorrect."),
                           walletFile));
         } else if (nLoadWalletRet == DBErrors::TOO_NEW) {
             error = strprintf(
                 _("Error loading %s: Wallet requires newer version of %s"),
                 walletFile, PACKAGE_NAME);
             return nullptr;
         } else if (nLoadWalletRet == DBErrors::NEED_REWRITE) {
             error = strprintf(
                 _("Wallet needed to be rewritten: restart %s to complete"),
                 PACKAGE_NAME);
             return nullptr;
         } else {
             error = strprintf(_("Error loading %s"), walletFile);
             return nullptr;
         }
     }
 
     if (fFirstRun) {
         // Ensure this wallet.dat can only be opened by clients supporting
         // HD with chain split and expects no default key.
         walletInstance->SetMinVersion(FEATURE_LATEST);
 
         walletInstance->AddWalletFlags(wallet_creation_flags);
 
         // Only create LegacyScriptPubKeyMan when not descriptor wallet
         if (!walletInstance->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS)) {
             walletInstance->SetupLegacyScriptPubKeyMan();
         }
 
         if (!(wallet_creation_flags &
               (WALLET_FLAG_DISABLE_PRIVATE_KEYS | WALLET_FLAG_BLANK_WALLET))) {
             LOCK(walletInstance->cs_wallet);
             if (walletInstance->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS)) {
                 walletInstance->SetupDescriptorScriptPubKeyMans();
                 // SetupDescriptorScriptPubKeyMans already calls SetupGeneration
                 // for us so we don't need to call SetupGeneration separately
             } else {
                 // Legacy wallets need SetupGeneration here.
                 for (auto spk_man :
                      walletInstance->GetActiveScriptPubKeyMans()) {
                     if (!spk_man->SetupGeneration()) {
                         error = _("Unable to generate initial keys");
                         return nullptr;
                     }
                 }
             }
         }
 
         walletInstance->chainStateFlushed(chain.getTipLocator());
     } else if (wallet_creation_flags & WALLET_FLAG_DISABLE_PRIVATE_KEYS) {
         // Make it impossible to disable private keys after creation
         error = strprintf(_("Error loading %s: Private keys can only be "
                             "disabled during creation"),
                           walletFile);
         return nullptr;
     } else if (walletInstance->IsWalletFlagSet(
                    WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {
         for (auto spk_man : walletInstance->GetActiveScriptPubKeyMans()) {
             if (spk_man->HavePrivateKeys()) {
                 warnings.push_back(
                     strprintf(_("Warning: Private keys detected in wallet {%s} "
                                 "with disabled private keys"),
                               walletFile));
             }
         }
     }
 
     if (gArgs.IsArgSet("-mintxfee")) {
         Amount n = Amount::zero();
         if (!ParseMoney(gArgs.GetArg("-mintxfee", ""), n) ||
             n == Amount::zero()) {
             error = AmountErrMsg("mintxfee", gArgs.GetArg("-mintxfee", ""));
             return nullptr;
         }
         if (n > HIGH_TX_FEE_PER_KB) {
             warnings.push_back(AmountHighWarn("-mintxfee") + Untranslated(" ") +
                                _("This is the minimum transaction fee you pay "
                                  "on every transaction."));
         }
         walletInstance->m_min_fee = CFeeRate(n);
     }
 
     if (gArgs.IsArgSet("-maxapsfee")) {
         const std::string max_aps_fee{gArgs.GetArg("-maxapsfee", "")};
         Amount n = Amount::zero();
         if (max_aps_fee == "-1") {
             n = -1 * SATOSHI;
         } else if (!ParseMoney(max_aps_fee, n)) {
             error = AmountErrMsg("maxapsfee", max_aps_fee);
             return nullptr;
         }
         if (n > HIGH_APS_FEE) {
             warnings.push_back(
                 AmountHighWarn("-maxapsfee") + Untranslated(" ") +
                 _("This is the maximum transaction fee you pay (in addition to"
                   " the normal fee) to prioritize partial spend avoidance over"
                   " regular coin selection."));
         }
         walletInstance->m_max_aps_fee = n;
     }
 
     if (gArgs.IsArgSet("-fallbackfee")) {
         Amount nFeePerK = Amount::zero();
         if (!ParseMoney(gArgs.GetArg("-fallbackfee", ""), nFeePerK)) {
             error =
                 strprintf(_("Invalid amount for -fallbackfee=<amount>: '%s'"),
                           gArgs.GetArg("-fallbackfee", ""));
             return nullptr;
         }
         if (nFeePerK > HIGH_TX_FEE_PER_KB) {
             warnings.push_back(AmountHighWarn("-fallbackfee") +
                                Untranslated(" ") +
                                _("This is the transaction fee you may pay when "
                                  "fee estimates are not available."));
         }
         walletInstance->m_fallback_fee = CFeeRate(nFeePerK);
     }
     // Disable fallback fee in case value was set to 0, enable if non-null value
     walletInstance->m_allow_fallback_fee =
         walletInstance->m_fallback_fee.GetFeePerK() != Amount::zero();
 
     if (gArgs.IsArgSet("-paytxfee")) {
         Amount nFeePerK = Amount::zero();
         if (!ParseMoney(gArgs.GetArg("-paytxfee", ""), nFeePerK)) {
             error = AmountErrMsg("paytxfee", gArgs.GetArg("-paytxfee", ""));
             return nullptr;
         }
         if (nFeePerK > HIGH_TX_FEE_PER_KB) {
             warnings.push_back(AmountHighWarn("-paytxfee") + Untranslated(" ") +
                                _("This is the transaction fee you will pay if "
                                  "you send a transaction."));
         }
         walletInstance->m_pay_tx_fee = CFeeRate(nFeePerK, 1000);
         if (walletInstance->m_pay_tx_fee < chain.relayMinFee()) {
             error = strprintf(_("Invalid amount for -paytxfee=<amount>: '%s' "
                                 "(must be at least %s)"),
                               gArgs.GetArg("-paytxfee", ""),
                               chain.relayMinFee().ToString());
             return nullptr;
         }
     }
 
     if (gArgs.IsArgSet("-maxtxfee")) {
         Amount nMaxFee = Amount::zero();
         if (!ParseMoney(gArgs.GetArg("-maxtxfee", ""), nMaxFee)) {
             error = AmountErrMsg("maxtxfee", gArgs.GetArg("-maxtxfee", ""));
             return nullptr;
         }
         if (nMaxFee > HIGH_MAX_TX_FEE) {
             warnings.push_back(_("-maxtxfee is set very high! Fees this large "
                                  "could be paid on a single transaction."));
         }
         if (CFeeRate(nMaxFee, 1000) < chain.relayMinFee()) {
             error = strprintf(
                 _("Invalid amount for -maxtxfee=<amount>: '%s' (must be at "
                   "least the minrelay fee of %s to prevent stuck "
                   "transactions)"),
                 gArgs.GetArg("-maxtxfee", ""), chain.relayMinFee().ToString());
             return nullptr;
         }
         walletInstance->m_default_max_tx_fee = nMaxFee;
     }
 
     if (chain.relayMinFee().GetFeePerK() > HIGH_TX_FEE_PER_KB) {
         warnings.push_back(
             AmountHighWarn("-minrelaytxfee") + Untranslated(" ") +
             _("The wallet will avoid paying less than the minimum relay fee."));
     }
 
     walletInstance->m_spend_zero_conf_change =
         gArgs.GetBoolArg("-spendzeroconfchange", DEFAULT_SPEND_ZEROCONF_CHANGE);
 
     walletInstance->m_default_address_type = DEFAULT_ADDRESS_TYPE;
 
     walletInstance->WalletLogPrintf("Wallet completed loading in %15dms\n",
                                     GetTimeMillis() - nStart);
 
     // Try to top up keypool. No-op if the wallet is locked.
     walletInstance->TopUpKeyPool();
 
     LOCK(walletInstance->cs_wallet);
 
     // Register wallet with validationinterface. It's done before rescan to
     // avoid missing block connections between end of rescan and validation
     // subscribing. Because of wallet lock being hold, block connection
     // notifications are going to be pending on the validation-side until lock
     // release. It's likely to have block processing duplicata (if rescan block
     // range overlaps with notification one) but we guarantee at least than
     // wallet state is correct after notifications delivery. This is temporary
     // until rescan and notifications delivery are unified under same interface.
     walletInstance->m_chain_notifications_handler =
         walletInstance->chain().handleNotifications(walletInstance);
 
     int rescan_height = 0;
     if (!gArgs.GetBoolArg("-rescan", false)) {
         WalletBatch batch(*walletInstance->database);
         CBlockLocator locator;
         if (batch.ReadBestBlock(locator)) {
             if (const std::optional<int> fork_height =
                     chain.findLocatorFork(locator)) {
                 rescan_height = *fork_height;
             }
         }
     }
 
     const std::optional<int> tip_height = chain.getHeight();
     if (tip_height) {
         walletInstance->m_last_block_processed =
             chain.getBlockHash(*tip_height);
         walletInstance->m_last_block_processed_height = *tip_height;
     } else {
         walletInstance->m_last_block_processed.SetNull();
         walletInstance->m_last_block_processed_height = -1;
     }
 
     if (tip_height && *tip_height != rescan_height) {
         // We can't rescan beyond non-pruned blocks, stop and throw an error.
         // This might happen if a user uses an old wallet within a pruned node
         // or if they ran -disablewallet for a longer time, then decided to
         // re-enable
         if (chain.havePruned()) {
             // Exit early and print an error.
             // If a block is pruned after this check, we will load the wallet,
             // but fail the rescan with a generic error.
             int block_height = *tip_height;
             while (block_height > 0 &&
                    chain.haveBlockOnDisk(block_height - 1) &&
                    rescan_height != block_height) {
                 --block_height;
             }
 
             if (rescan_height != block_height) {
                 error = _("Prune: last wallet synchronisation goes beyond "
                           "pruned data. You need to -reindex (download the "
                           "whole blockchain again in case of pruned node)");
                 return nullptr;
             }
         }
 
         chain.initMessage(_("Rescanning...").translated);
         walletInstance->WalletLogPrintf(
             "Rescanning last %i blocks (from block %i)...\n",
             *tip_height - rescan_height, rescan_height);
 
         // No need to read and scan block if block was created before our wallet
         // birthday (as adjusted for block time variability)
         std::optional<int64_t> time_first_key;
         for (auto spk_man : walletInstance->GetAllScriptPubKeyMans()) {
             int64_t time = spk_man->GetTimeFirstKey();
             if (!time_first_key || time < *time_first_key) {
                 time_first_key = time;
             }
         }
         if (time_first_key) {
             if (std::optional<int> first_block =
                     chain.findFirstBlockWithTimeAndHeight(
                         *time_first_key - TIMESTAMP_WINDOW, rescan_height,
                         nullptr)) {
                 rescan_height = *first_block;
             }
         }
 
         {
             WalletRescanReserver reserver(*walletInstance);
             if (!reserver.reserve() ||
                 (ScanResult::SUCCESS !=
                  walletInstance
                      ->ScanForWalletTransactions(
                          chain.getBlockHash(rescan_height), rescan_height,
                          {} /* max height */, reserver, true /* update */)
                      .status)) {
                 error = _("Failed to rescan the wallet during initialization");
                 return nullptr;
             }
         }
         walletInstance->chainStateFlushed(chain.getTipLocator());
         walletInstance->database->IncrementUpdateCounter();
 
         // Restore wallet transaction metadata after -zapwallettxes=1
         if (gArgs.GetBoolArg("-zapwallettxes", false) &&
             gArgs.GetArg("-zapwallettxes", "1") != "2") {
             WalletBatch batch(*walletInstance->database);
 
             for (const CWalletTx &wtxOld : vWtx) {
                 const TxId txid = wtxOld.GetId();
                 std::map<TxId, CWalletTx>::iterator mi =
                     walletInstance->mapWallet.find(txid);
                 if (mi != walletInstance->mapWallet.end()) {
                     const CWalletTx *copyFrom = &wtxOld;
                     CWalletTx *copyTo = &mi->second;
                     copyTo->mapValue = copyFrom->mapValue;
                     copyTo->vOrderForm = copyFrom->vOrderForm;
                     copyTo->nTimeReceived = copyFrom->nTimeReceived;
                     copyTo->nTimeSmart = copyFrom->nTimeSmart;
                     copyTo->fFromMe = copyFrom->fFromMe;
                     copyTo->nOrderPos = copyFrom->nOrderPos;
                     batch.WriteTx(*copyTo);
                 }
             }
         }
     }
 
     {
         LOCK(cs_wallets);
         for (auto &load_wallet : g_load_wallet_fns) {
             load_wallet(interfaces::MakeWallet(walletInstance));
         }
     }
 
     walletInstance->SetBroadcastTransactions(
         gArgs.GetBoolArg("-walletbroadcast", DEFAULT_WALLETBROADCAST));
 
     walletInstance->WalletLogPrintf("setKeyPool.size() = %u\n",
                                     walletInstance->GetKeyPoolSize());
     walletInstance->WalletLogPrintf("mapWallet.size() = %u\n",
                                     walletInstance->mapWallet.size());
     walletInstance->WalletLogPrintf("m_address_book.size() = %u\n",
                                     walletInstance->m_address_book.size());
 
     return walletInstance;
 }
 
 const CAddressBookData *
 CWallet::FindAddressBookEntry(const CTxDestination &dest,
                               bool allow_change) const {
     const auto &address_book_it = m_address_book.find(dest);
     if (address_book_it == m_address_book.end()) {
         return nullptr;
     }
     if ((!allow_change) && address_book_it->second.IsChange()) {
         return nullptr;
     }
     return &address_book_it->second;
 }
 
 bool CWallet::UpgradeWallet(int version, bilingual_str &error,
                             std::vector<bilingual_str> &warnings) {
     int prev_version = GetVersion();
     int nMaxVersion = version;
     // The -upgradewallet without argument case
     if (nMaxVersion == 0) {
         WalletLogPrintf("Performing wallet upgrade to %i\n", FEATURE_LATEST);
         nMaxVersion = FEATURE_LATEST;
         // permanently upgrade the wallet immediately
         SetMinVersion(FEATURE_LATEST);
     } else {
         WalletLogPrintf("Allowing wallet upgrade up to %i\n", nMaxVersion);
     }
 
     if (nMaxVersion < GetVersion()) {
         error = _("Cannot downgrade wallet");
         return false;
     }
 
     SetMaxVersion(nMaxVersion);
 
     LOCK(cs_wallet);
 
     // Do not upgrade versions to any version between HD_SPLIT and
     // FEATURE_PRE_SPLIT_KEYPOOL unless already supporting HD_SPLIT
     int max_version = GetVersion();
     if (!CanSupportFeature(FEATURE_HD_SPLIT) &&
         max_version >= FEATURE_HD_SPLIT &&
         max_version < FEATURE_PRE_SPLIT_KEYPOOL) {
         error = _("Cannot upgrade a non HD split wallet without upgrading to "
                   "support pre split keypool. Please use version 200300 or no "
                   "version specified.");
         return false;
     }
 
     for (auto spk_man : GetActiveScriptPubKeyMans()) {
         if (!spk_man->Upgrade(prev_version, error)) {
             return false;
         }
     }
 
     return true;
 }
 
 void CWallet::postInitProcess() {
     LOCK(cs_wallet);
 
     // Add wallet transactions that aren't already in a block to mempool.
     // Do this here as mempool requires genesis block to be loaded.
     ReacceptWalletTransactions();
 
     // Update wallet transactions with current mempool transactions.
     chain().requestMempoolTransactions(*this);
 }
 
 bool CWallet::BackupWallet(const std::string &strDest) const {
     return database->Backup(strDest);
 }
 
 CKeyPool::CKeyPool() {
     nTime = GetTime();
     fInternal = false;
     m_pre_split = false;
 }
 
 CKeyPool::CKeyPool(const CPubKey &vchPubKeyIn, bool internalIn) {
     nTime = GetTime();
     vchPubKey = vchPubKeyIn;
     fInternal = internalIn;
     m_pre_split = false;
 }
 
 int CWalletTx::GetDepthInMainChain() const {
     assert(pwallet != nullptr);
     AssertLockHeld(pwallet->cs_wallet);
     if (isUnconfirmed() || isAbandoned()) {
         return 0;
     }
 
     return (pwallet->GetLastBlockHeight() - m_confirm.block_height + 1) *
            (isConflicted() ? -1 : 1);
 }
 
 int CWalletTx::GetBlocksToMaturity() const {
     if (!IsCoinBase()) {
         return 0;
     }
 
     int chain_depth = GetDepthInMainChain();
     // coinbase tx should not be conflicted
     assert(chain_depth >= 0);
     return std::max(0, (COINBASE_MATURITY + 1) - chain_depth);
 }
 
 bool CWalletTx::IsImmatureCoinBase() const {
     // note GetBlocksToMaturity is 0 for non-coinbase tx
     return GetBlocksToMaturity() > 0;
 }
 
 std::vector<OutputGroup>
 CWallet::GroupOutputs(const std::vector<COutput> &outputs, bool single_coin,
                       const size_t max_ancestors) const {
     std::vector<OutputGroup> groups;
     std::map<CTxDestination, OutputGroup> gmap;
     std::set<CTxDestination> full_groups;
 
     for (const auto &output : outputs) {
         if (output.fSpendable) {
             CTxDestination dst;
             CInputCoin input_coin = output.GetInputCoin();
 
             size_t ancestors, descendants;
             chain().getTransactionAncestry(output.tx->GetId(), ancestors,
                                            descendants);
             if (!single_coin &&
                 ExtractDestination(output.tx->tx->vout[output.i].scriptPubKey,
                                    dst)) {
                 auto it = gmap.find(dst);
                 if (it != gmap.end()) {
                     // Limit output groups to no more than
                     // OUTPUT_GROUP_MAX_ENTRIES number of entries, to protect
                     // against inadvertently creating a too-large transaction
                     // when using -avoidpartialspends to prevent breaking
                     // consensus or surprising users with a very high amount of
                     // fees.
                     if (it->second.m_outputs.size() >=
                         OUTPUT_GROUP_MAX_ENTRIES) {
                         groups.push_back(it->second);
                         it->second = OutputGroup{};
                         full_groups.insert(dst);
                     }
                     it->second.Insert(input_coin, output.nDepth,
                                       output.tx->IsFromMe(ISMINE_ALL),
                                       ancestors, descendants);
                 } else {
                     gmap[dst].Insert(input_coin, output.nDepth,
                                      output.tx->IsFromMe(ISMINE_ALL), ancestors,
                                      descendants);
                 }
             } else {
                 groups.emplace_back(input_coin, output.nDepth,
                                     output.tx->IsFromMe(ISMINE_ALL), ancestors,
                                     descendants);
             }
         }
     }
     if (!single_coin) {
         for (auto &it : gmap) {
             auto &group = it.second;
             if (full_groups.count(it.first) > 0) {
                 // Make this unattractive as we want coin selection to avoid it
                 // if possible
                 group.m_ancestors = max_ancestors - 1;
             }
             groups.push_back(group);
         }
     }
     return groups;
 }
 
 bool CWallet::IsCrypted() const {
     return HasEncryptionKeys();
 }
 
 bool CWallet::IsLocked() const {
     if (!IsCrypted()) {
         return false;
     }
     LOCK(cs_wallet);
     return vMasterKey.empty();
 }
 
 bool CWallet::Lock() {
     if (!IsCrypted()) {
         return false;
     }
 
     {
         LOCK(cs_wallet);
         vMasterKey.clear();
     }
 
     NotifyStatusChanged(this);
     return true;
 }
 
 bool CWallet::Unlock(const CKeyingMaterial &vMasterKeyIn, bool accept_no_keys) {
     {
         LOCK(cs_wallet);
         for (const auto &spk_man_pair : m_spk_managers) {
             if (!spk_man_pair.second->CheckDecryptionKey(vMasterKeyIn,
                                                          accept_no_keys)) {
                 return false;
             }
         }
         vMasterKey = vMasterKeyIn;
     }
     NotifyStatusChanged(this);
     return true;
 }
 
 std::set<ScriptPubKeyMan *> CWallet::GetActiveScriptPubKeyMans() const {
     std::set<ScriptPubKeyMan *> spk_mans;
     for (bool internal : {false, true}) {
         for (OutputType t : OUTPUT_TYPES) {
             auto spk_man = GetScriptPubKeyMan(t, internal);
             if (spk_man) {
                 spk_mans.insert(spk_man);
             }
         }
     }
     return spk_mans;
 }
 
 std::set<ScriptPubKeyMan *> CWallet::GetAllScriptPubKeyMans() const {
     std::set<ScriptPubKeyMan *> spk_mans;
     for (const auto &spk_man_pair : m_spk_managers) {
         spk_mans.insert(spk_man_pair.second.get());
     }
     return spk_mans;
 }
 
 ScriptPubKeyMan *CWallet::GetScriptPubKeyMan(const OutputType &type,
                                              bool internal) const {
     const std::map<OutputType, ScriptPubKeyMan *> &spk_managers =
         internal ? m_internal_spk_managers : m_external_spk_managers;
     std::map<OutputType, ScriptPubKeyMan *>::const_iterator it =
         spk_managers.find(type);
     if (it == spk_managers.end()) {
         WalletLogPrintf(
             "%s scriptPubKey Manager for output type %d does not exist\n",
             internal ? "Internal" : "External", static_cast<int>(type));
         return nullptr;
     }
     return it->second;
 }
 
 std::set<ScriptPubKeyMan *>
 CWallet::GetScriptPubKeyMans(const CScript &script,
                              SignatureData &sigdata) const {
     std::set<ScriptPubKeyMan *> spk_mans;
     for (const auto &spk_man_pair : m_spk_managers) {
         if (spk_man_pair.second->CanProvide(script, sigdata)) {
             spk_mans.insert(spk_man_pair.second.get());
         }
     }
     return spk_mans;
 }
 
 ScriptPubKeyMan *CWallet::GetScriptPubKeyMan(const CScript &script) const {
     SignatureData sigdata;
     for (const auto &spk_man_pair : m_spk_managers) {
         if (spk_man_pair.second->CanProvide(script, sigdata)) {
             return spk_man_pair.second.get();
         }
     }
     return nullptr;
 }
 
 ScriptPubKeyMan *CWallet::GetScriptPubKeyMan(const uint256 &id) const {
     if (m_spk_managers.count(id) > 0) {
         return m_spk_managers.at(id).get();
     }
     return nullptr;
 }
 
 std::unique_ptr<SigningProvider>
 CWallet::GetSolvingProvider(const CScript &script) const {
     SignatureData sigdata;
     return GetSolvingProvider(script, sigdata);
 }
 
 std::unique_ptr<SigningProvider>
 CWallet::GetSolvingProvider(const CScript &script,
                             SignatureData &sigdata) const {
     for (const auto &spk_man_pair : m_spk_managers) {
         if (spk_man_pair.second->CanProvide(script, sigdata)) {
             return spk_man_pair.second->GetSolvingProvider(script);
         }
     }
     return nullptr;
 }
 
 LegacyScriptPubKeyMan *CWallet::GetLegacyScriptPubKeyMan() const {
     if (IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS)) {
         return nullptr;
     }
     // Legacy wallets only have one ScriptPubKeyMan which is a
     // LegacyScriptPubKeyMan. Everything in m_internal_spk_managers and
     // m_external_spk_managers point to the same legacyScriptPubKeyMan.
     auto it = m_internal_spk_managers.find(OutputType::LEGACY);
     if (it == m_internal_spk_managers.end()) {
         return nullptr;
     }
     return dynamic_cast<LegacyScriptPubKeyMan *>(it->second);
 }
 
 LegacyScriptPubKeyMan *CWallet::GetOrCreateLegacyScriptPubKeyMan() {
     SetupLegacyScriptPubKeyMan();
     return GetLegacyScriptPubKeyMan();
 }
 
 void CWallet::SetupLegacyScriptPubKeyMan() {
     if (!m_internal_spk_managers.empty() || !m_external_spk_managers.empty() ||
         !m_spk_managers.empty() || IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS)) {
         return;
     }
 
     auto spk_manager =
         std::unique_ptr<ScriptPubKeyMan>(new LegacyScriptPubKeyMan(*this));
     for (const auto &type : OUTPUT_TYPES) {
         m_internal_spk_managers[type] = spk_manager.get();
         m_external_spk_managers[type] = spk_manager.get();
     }
     m_spk_managers[spk_manager->GetID()] = std::move(spk_manager);
 }
 
 const CKeyingMaterial &CWallet::GetEncryptionKey() const {
     return vMasterKey;
 }
 
 bool CWallet::HasEncryptionKeys() const {
     return !mapMasterKeys.empty();
 }
 
 void CWallet::ConnectScriptPubKeyManNotifiers() {
     for (const auto &spk_man : GetActiveScriptPubKeyMans()) {
         spk_man->NotifyWatchonlyChanged.connect(NotifyWatchonlyChanged);
         spk_man->NotifyCanGetAddressesChanged.connect(
             NotifyCanGetAddressesChanged);
     }
 }
 
 void CWallet::LoadDescriptorScriptPubKeyMan(uint256 id,
                                             WalletDescriptor &desc) {
     auto spk_manager = std::unique_ptr<ScriptPubKeyMan>(
         new DescriptorScriptPubKeyMan(*this, desc));
     m_spk_managers[id] = std::move(spk_manager);
 }
 
 void CWallet::SetupDescriptorScriptPubKeyMans() {
     AssertLockHeld(cs_wallet);
 
     // Make a seed
     CKey seed_key;
     seed_key.MakeNewKey(true);
     CPubKey seed = seed_key.GetPubKey();
     assert(seed_key.VerifyPubKey(seed));
 
     // Get the extended key
     CExtKey master_key;
     master_key.SetSeed(seed_key.begin(), seed_key.size());
 
     for (bool internal : {false, true}) {
         for (OutputType t : OUTPUT_TYPES) {
             auto spk_manager =
                 std::make_unique<DescriptorScriptPubKeyMan>(*this, internal);
             if (IsCrypted()) {
                 if (IsLocked()) {
                     throw std::runtime_error(
                         std::string(__func__) +
                         ": Wallet is locked, cannot setup new descriptors");
                 }
                 if (!spk_manager->CheckDecryptionKey(vMasterKey) &&
                     !spk_manager->Encrypt(vMasterKey, nullptr)) {
                     throw std::runtime_error(
                         std::string(__func__) +
                         ": Could not encrypt new descriptors");
                 }
             }
             spk_manager->SetupDescriptorGeneration(master_key, t);
             uint256 id = spk_manager->GetID();
             m_spk_managers[id] = std::move(spk_manager);
             AddActiveScriptPubKeyMan(id, t, internal);
         }
     }
 }
 
 void CWallet::AddActiveScriptPubKeyMan(uint256 id, OutputType type,
                                        bool internal) {
     WalletBatch batch(*database);
     if (!batch.WriteActiveScriptPubKeyMan(static_cast<uint8_t>(type), id,
                                           internal)) {
         throw std::runtime_error(std::string(__func__) +
                                  ": writing active ScriptPubKeyMan id failed");
     }
     LoadActiveScriptPubKeyMan(id, type, internal);
 }
 
 void CWallet::LoadActiveScriptPubKeyMan(uint256 id, OutputType type,
                                         bool internal) {
     WalletLogPrintf(
         "Setting spkMan to active: id = %s, type = %d, internal = %d\n",
         id.ToString(), static_cast<int>(type), static_cast<int>(internal));
     auto &spk_mans =
         internal ? m_internal_spk_managers : m_external_spk_managers;
     auto spk_man = m_spk_managers.at(id).get();
     spk_man->SetInternal(internal);
     spk_mans[type] = spk_man;
 
     NotifyCanGetAddressesChanged();
 }
 
 bool CWallet::IsLegacy() const {
     if (m_internal_spk_managers.count(OutputType::LEGACY) == 0) {
         return false;
     }
     auto spk_man = dynamic_cast<LegacyScriptPubKeyMan *>(
         m_internal_spk_managers.at(OutputType::LEGACY));
     return spk_man != nullptr;
 }
 
 DescriptorScriptPubKeyMan *
 CWallet::GetDescriptorScriptPubKeyMan(const WalletDescriptor &desc) const {
     for (auto &spk_man_pair : m_spk_managers) {
         // Try to downcast to DescriptorScriptPubKeyMan then check if the
         // descriptors match
         DescriptorScriptPubKeyMan *spk_manager =
             dynamic_cast<DescriptorScriptPubKeyMan *>(
                 spk_man_pair.second.get());
         if (spk_manager != nullptr && spk_manager->HasWalletDescriptor(desc)) {
             return spk_manager;
         }
     }
 
     return nullptr;
 }
 
 ScriptPubKeyMan *
 CWallet::AddWalletDescriptor(WalletDescriptor &desc,
                              const FlatSigningProvider &signing_provider,
                              const std::string &label) {
     if (!IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS)) {
         WalletLogPrintf(
             "Cannot add WalletDescriptor to a non-descriptor wallet\n");
         return nullptr;
     }
 
     LOCK(cs_wallet);
     auto new_spk_man = std::make_unique<DescriptorScriptPubKeyMan>(*this, desc);
 
     // If we already have this descriptor, remove it from the maps but add the
     // existing cache to desc
     auto old_spk_man = GetDescriptorScriptPubKeyMan(desc);
     if (old_spk_man) {
         WalletLogPrintf("Update existing descriptor: %s\n",
                         desc.descriptor->ToString());
 
         {
             LOCK(old_spk_man->cs_desc_man);
             new_spk_man->SetCache(old_spk_man->GetWalletDescriptor().cache);
         }
 
         // Remove from maps of active spkMans
         auto old_spk_man_id = old_spk_man->GetID();
         for (bool internal : {false, true}) {
             for (OutputType t : OUTPUT_TYPES) {
                 auto active_spk_man = GetScriptPubKeyMan(t, internal);
                 if (active_spk_man &&
                     active_spk_man->GetID() == old_spk_man_id) {
                     if (internal) {
                         m_internal_spk_managers.erase(t);
                     } else {
                         m_external_spk_managers.erase(t);
                     }
                     break;
                 }
             }
         }
         m_spk_managers.erase(old_spk_man_id);
     }
 
     // Add the private keys to the descriptor
     for (const auto &entry : signing_provider.keys) {
         const CKey &key = entry.second;
         new_spk_man->AddDescriptorKey(key, key.GetPubKey());
     }
 
     // Top up key pool, the manager will generate new scriptPubKeys internally
     new_spk_man->TopUp();
 
     // Apply the label if necessary
     // Note: we disable labels for ranged descriptors
     if (!desc.descriptor->IsRange()) {
         auto script_pub_keys = new_spk_man->GetScriptPubKeys();
         if (script_pub_keys.empty()) {
             WalletLogPrintf(
                 "Could not generate scriptPubKeys (cache is empty)\n");
             return nullptr;
         }
 
         CTxDestination dest;
         if (ExtractDestination(script_pub_keys.at(0), dest)) {
             SetAddressBook(dest, label, "receive");
         }
     }
 
     // Save the descriptor to memory
     auto ret = new_spk_man.get();
     m_spk_managers[new_spk_man->GetID()] = std::move(new_spk_man);
 
     // Save the descriptor to DB
     ret->WriteDescriptor();
 
     return ret;
 }