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	// Copyright (c) 2009-2010 Satoshi Nakamoto
	// Copyright (c) 2009-2015 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 "consensus/consensus.h"
	#include "consensus/merkle.h"
	#include "consensus/validation.h"
	#include "hash.h"
	#include "validation.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.h"
	#include "utilmoneystr.h"
	#include "validationinterface.h"

	#include <algorithm>
	#include <boost/thread.hpp>
	#include <boost/tuple/tuple.hpp>
	#include <queue>
	#include <utility>

	using namespace std;

	//////////////////////////////////////////////////////////////////////////////
	//
	// BitcoinMiner
	//

	//
	// 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 priority or fee rate, so we might consider
	// transactions that depend on transactions that aren't yet in the block.

	uint64_t nLastBlockTx = 0;
	uint64_t nLastBlockSize = 0;
	uint64_t nLastBlockWeight = 0;

	class ScoreCompare
	{
	public:
	ScoreCompare() {}

	bool operator()(const CTxMemPool::txiter a, const CTxMemPool::txiter b)
	{
	return CompareTxMemPoolEntryByScore()(b,a); // Convert to less than
	}
	};

	int64_t UpdateTime(CBlockHeader* pblock, const Consensus::Params& consensusParams, 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 (consensusParams.fPowAllowMinDifficultyBlocks)
	pblock->nBits = GetNextWorkRequired(pindexPrev, pblock, consensusParams);

	return nNewTime - nOldTime;
	}

	BlockAssembler::BlockAssembler(const CChainParams& _chainparams)
	: chainparams(_chainparams)
	{
	// Block resource limits
	// If neither -blockmaxsize or -blockmaxweight is given, limit to DEFAULT_BLOCK_MAX_*
	// If only one is given, only restrict the specified resource.
	// If both are given, restrict both.
	nBlockMaxWeight = DEFAULT_BLOCK_MAX_WEIGHT;
	nBlockMaxSize = DEFAULT_BLOCK_MAX_SIZE;
	bool fWeightSet = false;
	if (mapArgs.count("-blockmaxweight")) {
	nBlockMaxWeight = GetArg("-blockmaxweight", DEFAULT_BLOCK_MAX_WEIGHT);
	nBlockMaxSize = MAX_BLOCK_SERIALIZED_SIZE;
	fWeightSet = true;
	}
	if (mapArgs.count("-blockmaxsize")) {
	nBlockMaxSize = GetArg("-blockmaxsize", DEFAULT_BLOCK_MAX_SIZE);
	if (!fWeightSet) {
	nBlockMaxWeight = nBlockMaxSize * WITNESS_SCALE_FACTOR;
	}
	}

	// Limit weight to between 4K and MAX_BLOCK_WEIGHT-4K for sanity:
	nBlockMaxWeight = std::max((unsigned int)4000, std::min((unsigned int)(MAX_BLOCK_WEIGHT-4000), nBlockMaxWeight));
	// Limit size to between 1K and MAX_BLOCK_SERIALIZED_SIZE-1K for sanity:
	nBlockMaxSize = std::max((unsigned int)1000, std::min((unsigned int)(MAX_BLOCK_SERIALIZED_SIZE-1000), nBlockMaxSize));

	// Whether we need to account for byte usage (in addition to weight usage)
	fNeedSizeAccounting = (nBlockMaxSize < MAX_BLOCK_SERIALIZED_SIZE-1000);
	}

	void BlockAssembler::resetBlock()
	{
	inBlock.clear();

	// Reserve space for coinbase tx
	nBlockSize = 1000;
	nBlockWeight = 4000;
	nBlockSigOpsCost = 400;
	fIncludeWitness = false;

	// These counters do not include coinbase tx
	nBlockTx = 0;
	nFees = 0;

	lastFewTxs = 0;
	blockFinished = false;
	}

	std::unique_ptr<CBlockTemplate> BlockAssembler::CreateNewBlock(const CScript& scriptPubKeyIn)
	{
	resetBlock();

	pblocktemplate.reset(new CBlockTemplate());

	if(!pblocktemplate.get())
	return nullptr;
	pblock = &pblocktemplate->block; // pointer for convenience

	// Add dummy coinbase tx as first transaction
	pblock->vtx.emplace_back();
	pblocktemplate->vTxFees.push_back(-1); // updated at end
	pblocktemplate->vTxSigOpsCost.push_back(-1); // updated at end

	LOCK2(cs_main, mempool.cs);
	CBlockIndex* pindexPrev = chainActive.Tip();
	nHeight = pindexPrev->nHeight + 1;

	pblock->nVersion = ComputeBlockVersion(pindexPrev, chainparams.GetConsensus());
	// -regtest only: allow overriding block.nVersion with
	// -blockversion=N to test forking scenarios
	if (chainparams.MineBlocksOnDemand())
	pblock->nVersion = GetArg("-blockversion", pblock->nVersion);

	pblock->nTime = GetAdjustedTime();
	const int64_t nMedianTimePast = pindexPrev->GetMedianTimePast();

	nLockTimeCutoff = (STANDARD_LOCKTIME_VERIFY_FLAGS & LOCKTIME_MEDIAN_TIME_PAST)
	? nMedianTimePast
	: pblock->GetBlockTime();

	// Decide whether to include witness transactions
	// This is only needed in case the witness softfork activation is reverted
	// (which would require a very deep reorganization) or when
	// -promiscuousmempoolflags is used.
	// TODO: replace this with a call to main to assess validity of a mempool
	// transaction (which in most cases can be a no-op).
	fIncludeWitness = IsWitnessEnabled(pindexPrev, chainparams.GetConsensus());

	addPriorityTxs();
	addPackageTxs();

	nLastBlockTx = nBlockTx;
	nLastBlockSize = nBlockSize;
	nLastBlockWeight = nBlockWeight;

	// Create coinbase transaction.
	CMutableTransaction coinbaseTx;
	coinbaseTx.vin.resize(1);
	coinbaseTx.vin[0].prevout.SetNull();
	coinbaseTx.vout.resize(1);
	coinbaseTx.vout[0].scriptPubKey = scriptPubKeyIn;
	coinbaseTx.vout[0].nValue = nFees + GetBlockSubsidy(nHeight, chainparams.GetConsensus());
	coinbaseTx.vin[0].scriptSig = CScript() << nHeight << OP_0;
	pblock->vtx[0] = MakeTransactionRef(std::move(coinbaseTx));
	pblocktemplate->vchCoinbaseCommitment = GenerateCoinbaseCommitment(*pblock, pindexPrev, chainparams.GetConsensus());
	pblocktemplate->vTxFees[0] = -nFees;

	uint64_t nSerializeSize = GetSerializeSize(*pblock, SER_NETWORK, PROTOCOL_VERSION);
	LogPrintf("CreateNewBlock(): total size: %u block weight: %u txs: %u fees: %ld sigops %d\n", nSerializeSize, GetBlockWeight(*pblock), nBlockTx, nFees, nBlockSigOpsCost);

	// Fill in header
	pblock->hashPrevBlock = pindexPrev->GetBlockHash();
	UpdateTime(pblock, chainparams.GetConsensus(), pindexPrev);
	pblock->nBits = GetNextWorkRequired(pindexPrev, pblock, chainparams.GetConsensus());
	pblock->nNonce = 0;
	pblocktemplate->vTxSigOpsCost[0] = WITNESS_SCALE_FACTOR * GetLegacySigOpCount(*pblock->vtx[0]);

	CValidationState state;
	if (!TestBlockValidity(state, chainparams, *pblock, pindexPrev, false, false)) {
	throw std::runtime_error(strprintf("%s: TestBlockValidity failed: %s", __func__, FormatStateMessage(state)));
	}

	return std::move(pblocktemplate);
	}

	bool BlockAssembler::isStillDependent(CTxMemPool::txiter iter)
	{
	BOOST_FOREACH(CTxMemPool::txiter parent, mempool.GetMemPoolParents(iter))
	{
	if (!inBlock.count(parent)) {
	return true;
	}
	}
	return false;
	}

	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 packageSigOpsCost)
	{
	// TODO: switch to weight-based accounting for packages instead of vsize-based accounting.
	if (nBlockWeight + WITNESS_SCALE_FACTOR * packageSize >= nBlockMaxWeight)
	return false;
	if (nBlockSigOpsCost + packageSigOpsCost >= MAX_BLOCK_SIGOPS_COST)
	return false;
	return true;
	}

	// Perform transaction-level checks before adding to block:
	// - transaction finality (locktime)
	// - premature witness (in case segwit transactions are added to mempool before
	// segwit activation)
	// - serialized size (in case -blockmaxsize is in use)
	bool BlockAssembler::TestPackageTransactions(const CTxMemPool::setEntries& package)
	{
	uint64_t nPotentialBlockSize = nBlockSize; // only used with fNeedSizeAccounting
	BOOST_FOREACH (const CTxMemPool::txiter it, package) {
	if (!IsFinalTx(it->GetTx(), nHeight, nLockTimeCutoff))
	return false;
	if (!fIncludeWitness && !it->GetTx().wit.IsNull())
	return false;
	if (fNeedSizeAccounting) {
	uint64_t nTxSize = ::GetSerializeSize(it->GetTx(), SER_NETWORK, PROTOCOL_VERSION);
	if (nPotentialBlockSize + nTxSize >= nBlockMaxSize) {
	return false;
	}
	nPotentialBlockSize += nTxSize;
	}
	}
	return true;
	}

	bool BlockAssembler::TestForBlock(CTxMemPool::txiter iter)
	{
	if (nBlockWeight + iter->GetTxWeight() >= nBlockMaxWeight) {
	// If the block is so close to full that no more txs will fit
	// or if we've tried more than 50 times to fill remaining space
	// then flag that the block is finished
	if (nBlockWeight > nBlockMaxWeight - 400 \|\| lastFewTxs > 50) {
	blockFinished = true;
	return false;
	}
	// Once we're within 4000 weight of a full block, only look at 50 more txs
	// to try to fill the remaining space.
	if (nBlockWeight > nBlockMaxWeight - 4000) {
	lastFewTxs++;
	}
	return false;
	}

	if (fNeedSizeAccounting) {
	if (nBlockSize + ::GetSerializeSize(iter->GetTx(), SER_NETWORK, PROTOCOL_VERSION) >= nBlockMaxSize) {
	if (nBlockSize > nBlockMaxSize - 100 \|\| lastFewTxs > 50) {
	blockFinished = true;
	return false;
	}
	if (nBlockSize > nBlockMaxSize - 1000) {
	lastFewTxs++;
	}
	return false;
	}
	}

	if (nBlockSigOpsCost + iter->GetSigOpCost() >= MAX_BLOCK_SIGOPS_COST) {
	// If the block has room for no more sig ops then
	// flag that the block is finished
	if (nBlockSigOpsCost > MAX_BLOCK_SIGOPS_COST - 8) {
	blockFinished = true;
	return false;
	}
	// Otherwise attempt to find another tx with fewer sigops
	// to put in the block.
	return false;
	}

	// Must check that lock times are still valid
	// This can be removed once MTP is always enforced
	// as long as reorgs keep the mempool consistent.
	if (!IsFinalTx(iter->GetTx(), nHeight, nLockTimeCutoff))
	return false;

	return true;
	}

	void BlockAssembler::AddToBlock(CTxMemPool::txiter iter)
	{
	pblock->vtx.emplace_back(iter->GetSharedTx());
	pblocktemplate->vTxFees.push_back(iter->GetFee());
	pblocktemplate->vTxSigOpsCost.push_back(iter->GetSigOpCost());
	if (fNeedSizeAccounting) {
	nBlockSize += ::GetSerializeSize(iter->GetTx(), SER_NETWORK, PROTOCOL_VERSION);
	}
	nBlockWeight += iter->GetTxWeight();
	++nBlockTx;
	nBlockSigOpsCost += iter->GetSigOpCost();
	nFees += iter->GetFee();
	inBlock.insert(iter);

	bool fPrintPriority = GetBoolArg("-printpriority", DEFAULT_PRINTPRIORITY);
	if (fPrintPriority) {
	double dPriority = iter->GetPriority(nHeight);
	CAmount dummy;
	mempool.ApplyDeltas(iter->GetTx().GetHash(), dPriority, dummy);
	LogPrintf("priority %.1f fee %s txid %s\n",
	dPriority,
	CFeeRate(iter->GetModifiedFee(), iter->GetTxSize()).ToString(),
	iter->GetTx().GetHash().ToString());
	}
	}

	void BlockAssembler::UpdatePackagesForAdded(const CTxMemPool::setEntries& alreadyAdded,
	indexed_modified_transaction_set &mapModifiedTx)
	{
	BOOST_FOREACH(const CTxMemPool::txiter it, alreadyAdded) {
	CTxMemPool::setEntries descendants;
	mempool.CalculateDescendants(it, descendants);
	// Insert all descendants (not yet in block) into the modified set
	BOOST_FOREACH(CTxMemPool::txiter desc, descendants) {
	if (alreadyAdded.count(desc))
	continue;
	modtxiter mit = mapModifiedTx.find(desc);
	if (mit == mapModifiedTx.end()) {
	CTxMemPoolModifiedEntry modEntry(desc);
	modEntry.nSizeWithAncestors -= it->GetTxSize();
	modEntry.nModFeesWithAncestors -= it->GetModifiedFee();
	modEntry.nSigOpCostWithAncestors -= it->GetSigOpCost();
	mapModifiedTx.insert(modEntry);
	} else {
	mapModifiedTx.modify(mit, update_for_parent_inclusion(it));
	}
	}
	}
	}

	// 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());
	if (mapModifiedTx.count(it) \|\| inBlock.count(it) \|\| failedTx.count(it))
	return true;
	return false;
	}

	void BlockAssembler::SortForBlock(const CTxMemPool::setEntries& package, CTxMemPool::txiter entry, 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());
	}

	// This transaction 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.
	void BlockAssembler::addPackageTxs()
	{
	// 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;
	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() &&
	CompareModifiedEntry()(*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();
	CAmount packageFees = iter->GetModFeesWithAncestors();
	int64_t packageSigOpsCost = iter->GetSigOpCostWithAncestors();
	if (fUsingModified) {
	packageSize = modit->nSizeWithAncestors;
	packageFees = modit->nModFeesWithAncestors;
	packageSigOpsCost = modit->nSigOpCostWithAncestors;
	}

	if (packageFees < ::minRelayTxFee.GetFee(packageSize)) {
	// Everything else we might consider has a lower fee rate
	return;
	}

	if (!TestPackage(packageSize, packageSigOpsCost)) {
	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;
	}

	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;
	}

	// Package can be added. Sort the entries in a valid order.
	vector<CTxMemPool::txiter> sortedEntries;
	SortForBlock(ancestors, iter, sortedEntries);

	for (size_t i=0; i<sortedEntries.size(); ++i) {
	AddToBlock(sortedEntries[i]);
	// Erase from the modified set, if present
	mapModifiedTx.erase(sortedEntries[i]);
	}

	// Update transactions that depend on each of these
	UpdatePackagesForAdded(ancestors, mapModifiedTx);
	}
	}

	void BlockAssembler::addPriorityTxs()
	{
	// How much of the block should be dedicated to high-priority transactions,
	// included regardless of the fees they pay
	unsigned int nBlockPrioritySize = GetArg("-blockprioritysize", DEFAULT_BLOCK_PRIORITY_SIZE);
	nBlockPrioritySize = std::min(nBlockMaxSize, nBlockPrioritySize);

	if (nBlockPrioritySize == 0) {
	return;
	}

	bool fSizeAccounting = fNeedSizeAccounting;
	fNeedSizeAccounting = true;

	// This vector will be sorted into a priority queue:
	vector<TxCoinAgePriority> vecPriority;
	TxCoinAgePriorityCompare pricomparer;
	std::map<CTxMemPool::txiter, double, CTxMemPool::CompareIteratorByHash> waitPriMap;
	typedef std::map<CTxMemPool::txiter, double, CTxMemPool::CompareIteratorByHash>::iterator waitPriIter;
	double actualPriority = -1;

	vecPriority.reserve(mempool.mapTx.size());
	for (CTxMemPool::indexed_transaction_set::iterator mi = mempool.mapTx.begin();
	mi != mempool.mapTx.end(); ++mi)
	{
	double dPriority = mi->GetPriority(nHeight);
	CAmount dummy;
	mempool.ApplyDeltas(mi->GetTx().GetHash(), dPriority, dummy);
	vecPriority.push_back(TxCoinAgePriority(dPriority, mi));
	}
	std::make_heap(vecPriority.begin(), vecPriority.end(), pricomparer);

	CTxMemPool::txiter iter;
	while (!vecPriority.empty() && !blockFinished) { // add a tx from priority queue to fill the blockprioritysize
	iter = vecPriority.front().second;
	actualPriority = vecPriority.front().first;
	std::pop_heap(vecPriority.begin(), vecPriority.end(), pricomparer);
	vecPriority.pop_back();

	// If tx already in block, skip
	if (inBlock.count(iter)) {
	assert(false); // shouldn't happen for priority txs
	continue;
	}

	// cannot accept witness transactions into a non-witness block
	if (!fIncludeWitness && !iter->GetTx().wit.IsNull())
	continue;

	// If tx is dependent on other mempool txs which haven't yet been included
	// then put it in the waitSet
	if (isStillDependent(iter)) {
	waitPriMap.insert(std::make_pair(iter, actualPriority));
	continue;
	}

	// If this tx fits in the block add it, otherwise keep looping
	if (TestForBlock(iter)) {
	AddToBlock(iter);

	// If now that this txs is added we've surpassed our desired priority size
	// or have dropped below the AllowFreeThreshold, then we're done adding priority txs
	if (nBlockSize >= nBlockPrioritySize \|\| !AllowFree(actualPriority)) {
	break;
	}

	// This tx was successfully added, so
	// add transactions that depend on this one to the priority queue to try again
	BOOST_FOREACH(CTxMemPool::txiter child, mempool.GetMemPoolChildren(iter))
	{
	waitPriIter wpiter = waitPriMap.find(child);
	if (wpiter != waitPriMap.end()) {
	vecPriority.push_back(TxCoinAgePriority(wpiter->second,child));
	std::push_heap(vecPriority.begin(), vecPriority.end(), pricomparer);
	waitPriMap.erase(wpiter);
	}
	}
	}
	}
	fNeedSizeAccounting = fSizeAccounting;
	}

	void IncrementExtraNonce(CBlock* pblock, const CBlockIndex* pindexPrev, unsigned int& nExtraNonce)
	{
	// Update nExtraNonce
	static uint256 hashPrevBlock;
	if (hashPrevBlock != pblock->hashPrevBlock)
	{
	nExtraNonce = 0;
	hashPrevBlock = pblock->hashPrevBlock;
	}
	++nExtraNonce;
	unsigned int nHeight = pindexPrev->nHeight+1; // Height first in coinbase required for block.version=2
	CMutableTransaction txCoinbase(*pblock->vtx[0]);
	txCoinbase.vin[0].scriptSig = (CScript() << nHeight << CScriptNum(nExtraNonce)) + COINBASE_FLAGS;
	assert(txCoinbase.vin[0].scriptSig.size() <= 100);

	pblock->vtx[0] = MakeTransactionRef(std::move(txCoinbase));
	pblock->hashMerkleRoot = BlockMerkleRoot(*pblock);
	}

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