diff --git a/src/miner.cpp b/src/miner.cpp
index 0312a3e5a..95dac5ffe 100644
--- a/src/miner.cpp
+++ b/src/miner.cpp
@@ -1,571 +1,571 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2016 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <miner.h>
 
 #include <amount.h>
 #include <chain.h>
 #include <chainparams.h>
 #include <coins.h>
 #include <config.h>
 #include <consensus/activation.h>
 #include <consensus/consensus.h>
 #include <consensus/merkle.h>
 #include <consensus/tx_verify.h>
 #include <consensus/validation.h>
 #include <hash.h>
 #include <net.h>
 #include <policy/policy.h>
 #include <pow.h>
 #include <primitives/transaction.h>
 #include <script/standard.h>
 #include <timedata.h>
 #include <txmempool.h>
 #include <util/moneystr.h>
 #include <util/system.h>
 #include <validation.h>
 #include <validationinterface.h>
 
 #include <algorithm>
 #include <queue>
 #include <utility>
 
 // Unconfirmed transactions in the memory pool often depend on other
 // transactions in the memory pool. When we select transactions from the
 // pool, we select by highest fee rate of a transaction combined with all
 // its ancestors.
 
 uint64_t nLastBlockTx = 0;
 uint64_t nLastBlockSize = 0;
 
 int64_t UpdateTime(CBlockHeader *pblock, const Consensus::Params &params,
                    const CBlockIndex *pindexPrev) {
     int64_t nOldTime = pblock->nTime;
     int64_t nNewTime =
         std::max(pindexPrev->GetMedianTimePast() + 1, GetAdjustedTime());
 
     if (nOldTime < nNewTime) {
         pblock->nTime = nNewTime;
     }
 
     // Updating time can change work required on testnet:
     if (params.fPowAllowMinDifficultyBlocks) {
         pblock->nBits = GetNextWorkRequired(pindexPrev, pblock, params);
     }
 
     return nNewTime - nOldTime;
 }
 
 uint64_t CTxMemPoolModifiedEntry::GetVirtualSizeWithAncestors() const {
     return GetVirtualTransactionSize(nSizeWithAncestors,
                                      nSigOpCountWithAncestors);
 }
 
 BlockAssembler::Options::Options()
     : nExcessiveBlockSize(DEFAULT_MAX_BLOCK_SIZE),
       nMaxGeneratedBlockSize(DEFAULT_MAX_GENERATED_BLOCK_SIZE),
       blockMinFeeRate(DEFAULT_BLOCK_MIN_TX_FEE_PER_KB) {}
 
 BlockAssembler::BlockAssembler(const CChainParams &params,
                                const CTxMemPool &_mempool,
                                const Options &options)
     : chainparams(params), mempool(&_mempool) {
     blockMinFeeRate = options.blockMinFeeRate;
     // Limit size to between 1K and options.nExcessiveBlockSize -1K for sanity:
     nMaxGeneratedBlockSize = std::max<uint64_t>(
         1000, std::min<uint64_t>(options.nExcessiveBlockSize - 1000,
                                  options.nMaxGeneratedBlockSize));
 }
 
 static BlockAssembler::Options DefaultOptions(const Config &config) {
     // Block resource limits
     // If -blockmaxsize is not given, limit to DEFAULT_MAX_GENERATED_BLOCK_SIZE
     // If only one is given, only restrict the specified resource.
     // If both are given, restrict both.
     BlockAssembler::Options options;
 
     options.nExcessiveBlockSize = config.GetMaxBlockSize();
 
     if (gArgs.IsArgSet("-blockmaxsize")) {
         options.nMaxGeneratedBlockSize =
             gArgs.GetArg("-blockmaxsize", DEFAULT_MAX_GENERATED_BLOCK_SIZE);
     }
 
     Amount n = Amount::zero();
     if (gArgs.IsArgSet("-blockmintxfee") &&
         ParseMoney(gArgs.GetArg("-blockmintxfee", ""), n)) {
         options.blockMinFeeRate = CFeeRate(n);
     }
 
     return options;
 }
 
 BlockAssembler::BlockAssembler(const Config &config, const CTxMemPool &_mempool)
     : BlockAssembler(config.GetChainParams(), _mempool,
                      DefaultOptions(config)) {}
 
 void BlockAssembler::resetBlock() {
     inBlock.clear();
 
     // Reserve space for coinbase tx.
     nBlockSize = 1000;
     nBlockSigOps = 100;
 
     // These counters do not include coinbase tx.
     nBlockTx = 0;
     nFees = Amount::zero();
 }
 
 std::unique_ptr<CBlockTemplate>
 BlockAssembler::CreateNewBlock(const CScript &scriptPubKeyIn) {
     int64_t nTimeStart = GetTimeMicros();
 
     resetBlock();
 
     pblocktemplate.reset(new CBlockTemplate());
     if (!pblocktemplate.get()) {
         return nullptr;
     }
 
     // Pointer for convenience.
     pblock = &pblocktemplate->block;
 
     // Add dummy coinbase tx as first transaction.  It is updated at the end.
     pblocktemplate->entries.emplace_back(CTransactionRef(), -SATOSHI, -1);
 
     LOCK2(cs_main, mempool->cs);
     CBlockIndex *pindexPrev = chainActive.Tip();
     assert(pindexPrev != nullptr);
     nHeight = pindexPrev->nHeight + 1;
 
-    pblock->nVersion =
-        ComputeBlockVersion(pindexPrev, chainparams.GetConsensus());
+    const Consensus::Params &consensusParams = chainparams.GetConsensus();
+
+    pblock->nVersion = ComputeBlockVersion(pindexPrev, consensusParams);
     // -regtest only: allow overriding block.nVersion with
     // -blockversion=N to test forking scenarios
     if (chainparams.MineBlocksOnDemand()) {
         pblock->nVersion = gArgs.GetArg("-blockversion", pblock->nVersion);
     }
 
     pblock->nTime = GetAdjustedTime();
     nMedianTimePast = pindexPrev->GetMedianTimePast();
     nLockTimeCutoff =
         (STANDARD_LOCKTIME_VERIFY_FLAGS & LOCKTIME_MEDIAN_TIME_PAST)
             ? nMedianTimePast
             : pblock->GetBlockTime();
 
     int nPackagesSelected = 0;
     int nDescendantsUpdated = 0;
     addPackageTxs(nPackagesSelected, nDescendantsUpdated);
 
-    if (IsMagneticAnomalyEnabled(chainparams.GetConsensus(), pindexPrev)) {
+    if (IsMagneticAnomalyEnabled(consensusParams, pindexPrev)) {
         // If magnetic anomaly is enabled, we make sure transaction are
         // canonically ordered.
         std::sort(std::begin(pblocktemplate->entries) + 1,
                   std::end(pblocktemplate->entries),
                   [](const CBlockTemplateEntry &a, const CBlockTemplateEntry &b)
                       -> bool { return a.tx->GetId() < b.tx->GetId(); });
     }
 
     // Copy all the transactions refs into the block
     pblock->vtx.reserve(pblocktemplate->entries.size());
     for (const CBlockTemplateEntry &entry : pblocktemplate->entries) {
         pblock->vtx.push_back(entry.tx);
     }
 
     int64_t nTime1 = GetTimeMicros();
 
     nLastBlockTx = nBlockTx;
     nLastBlockSize = nBlockSize;
 
     // Create coinbase transaction.
     CMutableTransaction coinbaseTx;
     coinbaseTx.vin.resize(1);
     coinbaseTx.vin[0].prevout = COutPoint();
     coinbaseTx.vout.resize(1);
     coinbaseTx.vout[0].scriptPubKey = scriptPubKeyIn;
     coinbaseTx.vout[0].nValue =
-        nFees + GetBlockSubsidy(nHeight, chainparams.GetConsensus());
+        nFees + GetBlockSubsidy(nHeight, consensusParams);
     coinbaseTx.vin[0].scriptSig = CScript() << nHeight << OP_0;
 
     // Make sure the coinbase is big enough.
     uint64_t coinbaseSize = ::GetSerializeSize(coinbaseTx, PROTOCOL_VERSION);
     if (coinbaseSize < MIN_TX_SIZE) {
         coinbaseTx.vin[0].scriptSig
             << std::vector<uint8_t>(MIN_TX_SIZE - coinbaseSize - 1);
     }
 
     pblocktemplate->entries[0].tx = MakeTransactionRef(coinbaseTx);
     pblocktemplate->entries[0].fees = -1 * nFees;
     pblock->vtx[0] = pblocktemplate->entries[0].tx;
 
     uint64_t nSerializeSize = GetSerializeSize(*pblock, PROTOCOL_VERSION);
 
     LogPrintf("CreateNewBlock(): total size: %u txs: %u fees: %ld sigops %d\n",
               nSerializeSize, nBlockTx, nFees, nBlockSigOps);
 
     // Fill in header.
     pblock->hashPrevBlock = pindexPrev->GetBlockHash();
-    UpdateTime(pblock, chainparams.GetConsensus(), pindexPrev);
-    pblock->nBits =
-        GetNextWorkRequired(pindexPrev, pblock, chainparams.GetConsensus());
+    UpdateTime(pblock, consensusParams, pindexPrev);
+    pblock->nBits = GetNextWorkRequired(pindexPrev, pblock, consensusParams);
     pblock->nNonce = 0;
     pblocktemplate->entries[0].sigOpCount = GetSigOpCountWithoutP2SH(
         *pblocktemplate->entries[0].tx, STANDARD_SCRIPT_VERIFY_FLAGS);
 
     CValidationState state;
     if (!TestBlockValidity(state, chainparams, *pblock, pindexPrev,
                            BlockValidationOptions(nMaxGeneratedBlockSize)
                                .withCheckPoW(false)
                                .withCheckMerkleRoot(false))) {
         throw std::runtime_error(strprintf("%s: TestBlockValidity failed: %s",
                                            __func__,
                                            FormatStateMessage(state)));
     }
     int64_t nTime2 = GetTimeMicros();
 
     LogPrint(BCLog::BENCH,
              "CreateNewBlock() packages: %.2fms (%d packages, %d updated "
              "descendants), validity: %.2fms (total %.2fms)\n",
              0.001 * (nTime1 - nTimeStart), nPackagesSelected,
              nDescendantsUpdated, 0.001 * (nTime2 - nTime1),
              0.001 * (nTime2 - nTimeStart));
 
     return std::move(pblocktemplate);
 }
 
 void BlockAssembler::onlyUnconfirmed(CTxMemPool::setEntries &testSet) {
     for (CTxMemPool::setEntries::iterator iit = testSet.begin();
          iit != testSet.end();) {
         // Only test txs not already in the block.
         if (inBlock.count(*iit)) {
             testSet.erase(iit++);
         } else {
             iit++;
         }
     }
 }
 
 bool BlockAssembler::TestPackage(uint64_t packageSize,
                                  int64_t packageSigOps) const {
     auto blockSizeWithPackage = nBlockSize + packageSize;
     if (blockSizeWithPackage >= nMaxGeneratedBlockSize) {
         return false;
     }
 
     if (nBlockSigOps + packageSigOps >=
         GetMaxBlockSigOpsCount(blockSizeWithPackage)) {
         return false;
     }
 
     return true;
 }
 
 /**
  * Perform transaction-level checks before adding to block:
  * - Transaction finality (locktime)
  * - Serialized size (in case -blockmaxsize is in use)
  */
 bool BlockAssembler::TestPackageTransactions(
     const CTxMemPool::setEntries &package) {
     uint64_t nPotentialBlockSize = nBlockSize;
     for (CTxMemPool::txiter it : package) {
         CValidationState state;
         if (!ContextualCheckTransaction(chainparams.GetConsensus(), it->GetTx(),
                                         state, nHeight, nLockTimeCutoff,
                                         nMedianTimePast)) {
             return false;
         }
 
         uint64_t nTxSize = ::GetSerializeSize(it->GetTx(), PROTOCOL_VERSION);
         if (nPotentialBlockSize + nTxSize >= nMaxGeneratedBlockSize) {
             return false;
         }
 
         nPotentialBlockSize += nTxSize;
     }
 
     return true;
 }
 
 void BlockAssembler::AddToBlock(CTxMemPool::txiter iter) {
     pblocktemplate->entries.emplace_back(iter->GetSharedTx(), iter->GetFee(),
                                          iter->GetSigOpCount());
     nBlockSize += iter->GetTxSize();
     ++nBlockTx;
     nBlockSigOps += iter->GetSigOpCount();
     nFees += iter->GetFee();
     inBlock.insert(iter);
 
     bool fPrintPriority =
         gArgs.GetBoolArg("-printpriority", DEFAULT_PRINTPRIORITY);
     if (fPrintPriority) {
         LogPrintf(
             "fee %s txid %s\n",
             CFeeRate(iter->GetModifiedFee(), iter->GetTxSize()).ToString(),
             iter->GetTx().GetId().ToString());
     }
 }
 
 int BlockAssembler::UpdatePackagesForAdded(
     const CTxMemPool::setEntries &alreadyAdded,
     indexed_modified_transaction_set &mapModifiedTx) {
     int nDescendantsUpdated = 0;
     for (CTxMemPool::txiter it : alreadyAdded) {
         CTxMemPool::setEntries descendants;
         mempool->CalculateDescendants(it, descendants);
         // Insert all descendants (not yet in block) into the modified set.
         for (CTxMemPool::txiter desc : descendants) {
             if (alreadyAdded.count(desc)) {
                 continue;
             }
 
             ++nDescendantsUpdated;
             modtxiter mit = mapModifiedTx.find(desc);
             if (mit == mapModifiedTx.end()) {
                 CTxMemPoolModifiedEntry modEntry(desc);
                 modEntry.nSizeWithAncestors -= it->GetTxSize();
                 modEntry.nModFeesWithAncestors -= it->GetModifiedFee();
                 modEntry.nSigOpCountWithAncestors -= it->GetSigOpCount();
                 mapModifiedTx.insert(modEntry);
             } else {
                 mapModifiedTx.modify(mit, update_for_parent_inclusion(it));
             }
         }
     }
 
     return nDescendantsUpdated;
 }
 
 // Skip entries in mapTx that are already in a block or are present in
 // mapModifiedTx (which implies that the mapTx ancestor state is stale due to
 // ancestor inclusion in the block). Also skip transactions that we've already
 // failed to add. This can happen if we consider a transaction in mapModifiedTx
 // and it fails: we can then potentially consider it again while walking mapTx.
 // It's currently guaranteed to fail again, but as a belt-and-suspenders check
 // we put it in failedTx and avoid re-evaluation, since the re-evaluation would
 // be using cached size/sigops/fee values that are not actually correct.
 bool BlockAssembler::SkipMapTxEntry(
     CTxMemPool::txiter it, indexed_modified_transaction_set &mapModifiedTx,
     CTxMemPool::setEntries &failedTx) {
     assert(it != mempool->mapTx.end());
     return mapModifiedTx.count(it) || inBlock.count(it) || failedTx.count(it);
 }
 
 void BlockAssembler::SortForBlock(
     const CTxMemPool::setEntries &package,
     std::vector<CTxMemPool::txiter> &sortedEntries) {
     // Sort package by ancestor count. If a transaction A depends on transaction
     // B, then A's ancestor count must be greater than B's. So this is
     // sufficient to validly order the transactions for block inclusion.
     sortedEntries.clear();
     sortedEntries.insert(sortedEntries.begin(), package.begin(), package.end());
     std::sort(sortedEntries.begin(), sortedEntries.end(),
               CompareTxIterByAncestorCount());
 }
 
 /**
  * addPackageTx includes transactions paying a fee by ensuring that
  * the partial ordering of transactions is maintained.  That is to say
  * children come after parents, despite having a potentially larger fee.
  * @param[out] nPackagesSelected    How many packages were selected
  * @param[out] nDescendantsUpdated  Number of descendant transactions updated
  */
 void BlockAssembler::addPackageTxs(int &nPackagesSelected,
                                    int &nDescendantsUpdated) {
     // selection algorithm orders the mempool based on feerate of a
     // transaction including all unconfirmed ancestors. Since we don't remove
     // transactions from the mempool as we select them for block inclusion, we
     // need an alternate method of updating the feerate of a transaction with
     // its not-yet-selected ancestors as we go. This is accomplished by
     // walking the in-mempool descendants of selected transactions and storing
     // a temporary modified state in mapModifiedTxs. Each time through the
     // loop, we compare the best transaction in mapModifiedTxs with the next
     // transaction in the mempool to decide what transaction package to work
     // on next.
 
     // mapModifiedTx will store sorted packages after they are modified because
     // some of their txs are already in the block.
     indexed_modified_transaction_set mapModifiedTx;
     // Keep track of entries that failed inclusion, to avoid duplicate work.
     CTxMemPool::setEntries failedTx;
 
     // Start by adding all descendants of previously added txs to mapModifiedTx
     // and modifying them for their already included ancestors.
     UpdatePackagesForAdded(inBlock, mapModifiedTx);
 
     CTxMemPool::indexed_transaction_set::index<ancestor_score>::type::iterator
         mi = mempool->mapTx.get<ancestor_score>().begin();
     CTxMemPool::txiter iter;
 
     // Limit the number of attempts to add transactions to the block when it is
     // close to full; this is just a simple heuristic to finish quickly if the
     // mempool has a lot of entries.
     const int64_t MAX_CONSECUTIVE_FAILURES = 1000;
     int64_t nConsecutiveFailed = 0;
 
     while (mi != mempool->mapTx.get<ancestor_score>().end() ||
            !mapModifiedTx.empty()) {
         // First try to find a new transaction in mapTx to evaluate.
         if (mi != mempool->mapTx.get<ancestor_score>().end() &&
             SkipMapTxEntry(mempool->mapTx.project<0>(mi), mapModifiedTx,
                            failedTx)) {
             ++mi;
             continue;
         }
 
         // Now that mi is not stale, determine which transaction to evaluate:
         // the next entry from mapTx, or the best from mapModifiedTx?
         bool fUsingModified = false;
 
         modtxscoreiter modit = mapModifiedTx.get<ancestor_score>().begin();
         if (mi == mempool->mapTx.get<ancestor_score>().end()) {
             // We're out of entries in mapTx; use the entry from mapModifiedTx
             iter = modit->iter;
             fUsingModified = true;
         } else {
             // Try to compare the mapTx entry to the mapModifiedTx entry.
             iter = mempool->mapTx.project<0>(mi);
             if (modit != mapModifiedTx.get<ancestor_score>().end() &&
                 CompareTxMemPoolEntryByAncestorFee()(
                     *modit, CTxMemPoolModifiedEntry(iter))) {
                 // The best entry in mapModifiedTx has higher score than the one
                 // from mapTx. Switch which transaction (package) to consider
                 iter = modit->iter;
                 fUsingModified = true;
             } else {
                 // Either no entry in mapModifiedTx, or it's worse than mapTx.
                 // Increment mi for the next loop iteration.
                 ++mi;
             }
         }
 
         // We skip mapTx entries that are inBlock, and mapModifiedTx shouldn't
         // contain anything that is inBlock.
         assert(!inBlock.count(iter));
 
         uint64_t packageSize = iter->GetSizeWithAncestors();
         Amount packageFees = iter->GetModFeesWithAncestors();
         int64_t packageSigOps = iter->GetSigOpCountWithAncestors();
         if (fUsingModified) {
             packageSize = modit->nSizeWithAncestors;
             packageFees = modit->nModFeesWithAncestors;
             packageSigOps = modit->nSigOpCountWithAncestors;
         }
 
         if (packageFees < blockMinFeeRate.GetFee(packageSize)) {
             // Don't include this package, but don't stop yet because something
             // else we might consider may have a sufficient fee rate (since txes
             // are ordered by virtualsize feerate, not actual feerate).
             if (fUsingModified) {
                 // Since we always look at the best entry in mapModifiedTx, we
                 // must erase failed entries so that we can consider the next
                 // best entry on the next loop iteration
                 mapModifiedTx.get<ancestor_score>().erase(modit);
                 failedTx.insert(iter);
             }
             continue;
         }
 
         // The following must not use virtual size since TestPackage relies on
         // having an accurate call to
         // GetMaxBlockSigOpsCount(blockSizeWithPackage).
         if (!TestPackage(packageSize, packageSigOps)) {
             if (fUsingModified) {
                 // Since we always look at the best entry in mapModifiedTx, we
                 // must erase failed entries so that we can consider the next
                 // best entry on the next loop iteration
                 mapModifiedTx.get<ancestor_score>().erase(modit);
                 failedTx.insert(iter);
             }
 
             ++nConsecutiveFailed;
 
             if (nConsecutiveFailed > MAX_CONSECUTIVE_FAILURES &&
                 nBlockSize > nMaxGeneratedBlockSize - 1000) {
                 // Give up if we're close to full and haven't succeeded in a
                 // while.
                 break;
             }
 
             continue;
         }
 
         CTxMemPool::setEntries ancestors;
         uint64_t nNoLimit = std::numeric_limits<uint64_t>::max();
         std::string dummy;
         mempool->CalculateMemPoolAncestors(*iter, ancestors, nNoLimit, nNoLimit,
                                            nNoLimit, nNoLimit, dummy, false);
 
         onlyUnconfirmed(ancestors);
         ancestors.insert(iter);
 
         // Test if all tx's are Final.
         if (!TestPackageTransactions(ancestors)) {
             if (fUsingModified) {
                 mapModifiedTx.get<ancestor_score>().erase(modit);
                 failedTx.insert(iter);
             }
             continue;
         }
 
         // This transaction will make it in; reset the failed counter.
         nConsecutiveFailed = 0;
 
         // Package can be added. Sort the entries in a valid order.
         std::vector<CTxMemPool::txiter> sortedEntries;
         SortForBlock(ancestors, sortedEntries);
 
         for (auto &entry : sortedEntries) {
             AddToBlock(entry);
             // Erase from the modified set, if present
             mapModifiedTx.erase(entry);
         }
 
         ++nPackagesSelected;
 
         // Update transactions that depend on each of these
         nDescendantsUpdated += UpdatePackagesForAdded(ancestors, mapModifiedTx);
     }
 }
 
 static const std::vector<uint8_t>
 getExcessiveBlockSizeSig(uint64_t nExcessiveBlockSize) {
     std::string cbmsg = "/EB" + getSubVersionEB(nExcessiveBlockSize) + "/";
     std::vector<uint8_t> vec(cbmsg.begin(), cbmsg.end());
     return vec;
 }
 
 void IncrementExtraNonce(CBlock *pblock, const CBlockIndex *pindexPrev,
                          uint64_t nExcessiveBlockSize,
                          unsigned int &nExtraNonce) {
     // Update nExtraNonce
     static uint256 hashPrevBlock;
     if (hashPrevBlock != pblock->hashPrevBlock) {
         nExtraNonce = 0;
         hashPrevBlock = pblock->hashPrevBlock;
     }
 
     ++nExtraNonce;
     // Height first in coinbase required for block.version=2
     unsigned int nHeight = pindexPrev->nHeight + 1;
     CMutableTransaction txCoinbase(*pblock->vtx[0]);
     txCoinbase.vin[0].scriptSig =
         (CScript() << nHeight << CScriptNum(nExtraNonce)
                    << getExcessiveBlockSizeSig(nExcessiveBlockSize)) +
         COINBASE_FLAGS;
 
     // Make sure the coinbase is big enough.
     uint64_t coinbaseSize = ::GetSerializeSize(txCoinbase, PROTOCOL_VERSION);
     if (coinbaseSize < MIN_TX_SIZE) {
         txCoinbase.vin[0].scriptSig
             << std::vector<uint8_t>(MIN_TX_SIZE - coinbaseSize - 1);
     }
 
     assert(txCoinbase.vin[0].scriptSig.size() <= MAX_COINBASE_SCRIPTSIG_SIZE);
     assert(::GetSerializeSize(txCoinbase, PROTOCOL_VERSION) >= MIN_TX_SIZE);
 
     pblock->vtx[0] = MakeTransactionRef(std::move(txCoinbase));
     pblock->hashMerkleRoot = BlockMerkleRoot(*pblock);
 }