ecoin/ecoin/src/miner.cpp

// ECOin - Copyright (c) - 2014/2022 - GPLv3 - epsylon@riseup.net (https://03c8.net)

#include "txdb.h"
#include "miner.h"
#include "kernel.h"
#include <iostream>

using namespace std;

string strMintWarning;

extern unsigned int nMinerSleep;

int static FormatHashBlocks(void* pbuffer, unsigned int len)
{
    unsigned char* pdata = (unsigned char*)pbuffer;
    unsigned int blocks = 1 + ((len + 8) / 64);
    unsigned char* pend = pdata + 64 * blocks;
    memset(pdata + len, 0, 64 * blocks - len);
    pdata[len] = 0x80;
    unsigned int bits = len * 8;
    pend[-1] = (bits >> 0) & 0xff;
    pend[-2] = (bits >> 8) & 0xff;
    pend[-3] = (bits >> 16) & 0xff;
    pend[-4] = (bits >> 24) & 0xff;
    return blocks;
}

static const unsigned int pSHA256InitState[8] =
{0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19};

void SHA256Transform(void* pstate, void* pinput, const void* pinit)
{
    SHA256_CTX ctx;
    unsigned char data[64];

    SHA256_Init(&ctx);

    for (int i = 0; i < 16; i++)
        ((uint32_t*)data)[i] = ByteReverse(((uint32_t*)pinput)[i]);

    for (int i = 0; i < 8; i++)
        ctx.h[i] = ((uint32_t*)pinit)[i];

    SHA256_Update(&ctx, data, sizeof(data));
    for (int i = 0; i < 8; i++)
        ((uint32_t*)pstate)[i] = ctx.h[i];
}

class COrphan
{
public:
    CTransaction* ptx;
    set<uint256> setDependsOn;
    double dPriority;
    double dFeePerKb;

    COrphan(CTransaction* ptxIn)
    {
        ptx = ptxIn;
        dPriority = dFeePerKb = 0;
    }

    void print() const
    {
        printf("COrphan(hash=%s, dPriority=%.1f, dFeePerKb=%.1f)\n",
               ptx->GetHash().ToString().substr(0,10).c_str(), dPriority, dFeePerKb);
        BOOST_FOREACH(uint256 hash, setDependsOn)
            printf("   setDependsOn %s\n", hash.ToString().substr(0,10).c_str());
    }
};

uint64 nLastBlockTx = 0;
uint64 nLastBlockSize = 0;
int64 nLastCoinStakeSearchInterval = 0;

typedef boost::tuple<double, double, CTransaction*> TxPriority;
class TxPriorityCompare
{
    bool byFee;
public:
    TxPriorityCompare(bool _byFee) : byFee(_byFee) { }
    bool operator()(const TxPriority& a, const TxPriority& b)
    {
        if (byFee)
        {
            if (a.get<1>() == b.get<1>())
                return a.get<0>() < b.get<0>();
            return a.get<1>() < b.get<1>();
        }
        else
        {
            if (a.get<0>() == b.get<0>())
                return a.get<1>() < b.get<1>();
            return a.get<0>() < b.get<0>();
        }
    }
};

typedef boost::tuple<bool, CEcoinAddress> ProofOfTx;

ProofOfTx ProofOfTxSearch(unsigned int nBlockHeight, CReserveKey pubKey)
{
	bool fMatch = false;
	CEcoinAddress addrMiner;
	CBlock block;
	CBlockIndex* pblockindex = FindBlockByHeight(nBlockHeight);
	uint256 hashLastBlock = pblockindex->GetBlockHash();
	pblockindex = mapBlockIndex[hashLastBlock];
	block.ReadFromDisk(pblockindex, true);
	CMerkleTx txGen(block.vtx[0]);
	txGen.SetMerkleBranch(&block);

    if (!fMatch && nBlockHeight+1 > 57000 && block.vtx.size() <= 20)
	{
        BOOST_FOREACH (const CTransaction& tx, block.vtx)
        {
		    if (tx.vout.size() <= 3)
		    {
		        for (unsigned int i = 0; i < tx.vout.size(); i++)
			    {
				   const CTxOut& txout = tx.vout[i];

				   if (txout.nValue / 1000000.00 > 1)
				   {
				       txnouttype type;
				       vector<CTxDestination> vAddresses;
				       int nRequired;

				       ExtractDestinations(txout.scriptPubKey, type, vAddresses, nRequired);

				       BOOST_FOREACH(const CTxDestination& addr, vAddresses)
				       {
					       const char* pszAddress = CEcoinAddress(addr).ToString().c_str();
					       CScript addrHex = CScript() << vector<unsigned char>((const unsigned char*)pszAddress, (const unsigned char*)pszAddress + strlen(pszAddress));
					       string strSearch = SearchTermV2(addrHex.ToString().c_str());

					       if (fAddrMiner(hashLastBlock.GetHex().c_str(), strSearch.c_str()))
				 	       {
							   addrMiner = CEcoinAddress(addr);
						       fMatch = true;
						   }
					       else
					       {
							   fMatch = false;
							   CKeyID keyID = pubKey.GetReservedKey().GetID();
					           addrMiner.Set(keyID);
                           }
				       }
			       }
			    }
		    }
		    else
		    {
				unsigned int iv = 0;
				if (tx.vout.size() > 10)
				    iv = 10;
				else
				    iv = tx.vout.size();

		        for (unsigned int i = 0; i < iv; i++)
			    {
				   const CTxOut& txout = tx.vout[i];

				   if (txout.nValue / 1000000.00 > 1)
				   {
				       txnouttype type;
				       vector<CTxDestination> vAddresses;
				       int nRequired;

				       ExtractDestinations(txout.scriptPubKey, type, vAddresses, nRequired);

				       BOOST_FOREACH(const CTxDestination& addr, vAddresses)
				       {
					       const char* pszAddress = CEcoinAddress(addr).ToString().c_str();
					       CScript addrHex = CScript() << vector<unsigned char>((const unsigned char*)pszAddress, (const unsigned char*)pszAddress + strlen(pszAddress));
					       string strSearch = SearchTerm(addrHex.ToString().c_str());

					       if (fAddrMiner(hashLastBlock.GetHex().c_str(), strSearch.c_str()))
				 	       {
							   addrMiner = CEcoinAddress(addr);
						       fMatch = true;
						   }
					       else
					       {
							   fMatch = false;
							   CKeyID keyID = pubKey.GetReservedKey().GetID();
					           addrMiner.Set(keyID);
                           }
				       }
			       }
			    }
			}
        }
    }
    else if (!fMatch && nBlockHeight+1 > 57000 && block.vtx.size() > 20)
    {
		CKeyID keyID = pubKey.GetReservedKey().GetID();
	    addrMiner.Set(keyID);

        return boost::make_tuple(false, addrMiner);
	}

    else if (!fMatch && nBlockHeight+1 > 22000 && nBlockHeight+1 <= 57000 && block.vtx.size() < 11)
	{
        BOOST_FOREACH (const CTransaction& tx, block.vtx)
        {
		    if (tx.vout.size() < 11)
		    {
		        for (unsigned int i = 0; i < tx.vout.size(); i++)
			    {
				   const CTxOut& txout = tx.vout[i];

				   if (txout.nValue / 1000000.00 > 500)
				   {
				       txnouttype type;
				       vector<CTxDestination> vAddresses;
				       int nRequired;

				       ExtractDestinations(txout.scriptPubKey, type, vAddresses, nRequired);

				       BOOST_FOREACH(const CTxDestination& addr, vAddresses)
				       {
					       const char* pszAddress = CEcoinAddress(addr).ToString().c_str();
					       CScript addrHex = CScript() << vector<unsigned char>((const unsigned char*)pszAddress, (const unsigned char*)pszAddress + strlen(pszAddress));
					       string strSearch = SearchTerm(addrHex.ToString().c_str());

					       if (fAddrMiner(hashLastBlock.GetHex().c_str(), strSearch.c_str()))
				 	       {
							   addrMiner = CEcoinAddress(addr);
						       fMatch = true;
						   }
					       else
					       {
							   fMatch = false;
							   CKeyID keyID = pubKey.GetReservedKey().GetID();
					           addrMiner.Set(keyID);
                           }
				       }
			       }
			    }
		    }
		    else
		    {
		        for (unsigned int i = 0; i < 5; i++)
			    {
				   const CTxOut& txout = tx.vout[i];

				   if (txout.nValue / 1000000.00 > 500)
				   {
				       txnouttype type;
				       vector<CTxDestination> vAddresses;
				       int nRequired;

				       ExtractDestinations(txout.scriptPubKey, type, vAddresses, nRequired);

				       BOOST_FOREACH(const CTxDestination& addr, vAddresses)
				       {
					       const char* pszAddress = CEcoinAddress(addr).ToString().c_str();
					       CScript addrHex = CScript() << vector<unsigned char>((const unsigned char*)pszAddress, (const unsigned char*)pszAddress + strlen(pszAddress));
					       string strSearch = SearchTerm(addrHex.ToString().c_str());

					       if (fAddrMiner(hashLastBlock.GetHex().c_str(), strSearch.c_str()))
				 	       {
							   addrMiner = CEcoinAddress(addr);
						       fMatch = true;
						   }
					       else
					       {
							   fMatch = false;
							   CKeyID keyID = pubKey.GetReservedKey().GetID();
					           addrMiner.Set(keyID);
                           }
				       }
			       }
			    }
			}
        }
    }
    else if (!fMatch && nBlockHeight+1 > 22000 && nBlockHeight+1 <= 57000 && block.vtx.size() > 10)
    {
		CKeyID keyID = pubKey.GetReservedKey().GetID();
	    addrMiner.Set(keyID);

        return boost::make_tuple(false, addrMiner);
	}
	else if (nBlockHeight+1 > 12400 && nBlockHeight+1 < 22001 && block.vtx.size() > 5)
	{
		CKeyID keyID = pubKey.GetReservedKey().GetID();
		addrMiner.Set(keyID);

        return boost::make_tuple(false, addrMiner);
    }
    else if (!fMatch && nBlockHeight+1 > 12400 && nBlockHeight+1 < 22001 && block.vtx.size() < 6)
    {
	    BOOST_FOREACH (const CTransaction& tx, block.vtx)
	    {
	        for (unsigned int i = 0; i < tx.vout.size(); i++)
		    {
			   const CTxOut& txout = tx.vout[i];

			   if (txout.nValue / 1000000.00 > 500)
			   {
			       txnouttype type;
			       vector<CTxDestination> vAddresses;
			       int nRequired;

			        ExtractDestinations(txout.scriptPubKey, type, vAddresses, nRequired);

			        BOOST_FOREACH(const CTxDestination& addr, vAddresses)
			        {
				        const char* pszAddress = CEcoinAddress(addr).ToString().c_str();
				        CScript addrHex = CScript() << vector<unsigned char>((const unsigned char*)pszAddress, (const unsigned char*)pszAddress + strlen(pszAddress));
				        string strSearch = SearchTerm(addrHex.ToString().c_str());

				        if (fAddrMiner(hashLastBlock.GetHex().c_str(), strSearch.c_str()))
			 	        {
						    addrMiner = CEcoinAddress(addr);
					        fMatch = true;
					    }
				        else
				        {
						    fMatch = false;
						    CKeyID keyID = pubKey.GetReservedKey().GetID();
						    addrMiner.Set(keyID);
					    }
			        }
		        }
		    }
	    }
    }
	else if (!fMatch && nBlockHeight > 0 && nBlockHeight+1 <= 12400)
	{
	    BOOST_FOREACH (const CTransaction& tx, block.vtx)
	    {
	        for (unsigned int i = 0; i < tx.vout.size(); i++)
		    {
			   const CTxOut& txout = tx.vout[i];

			   if (txout.nValue / 1000000.00 > 500)
			   {
			       txnouttype type;
			       vector<CTxDestination> vAddresses;
			       int nRequired;

			        ExtractDestinations(txout.scriptPubKey, type, vAddresses, nRequired);

			        BOOST_FOREACH(const CTxDestination& addr, vAddresses)
			        {
				        const char* pszAddress = CEcoinAddress(addr).ToString().c_str();
				        CScript addrHex = CScript() << vector<unsigned char>((const unsigned char*)pszAddress, (const unsigned char*)pszAddress + strlen(pszAddress));
				        string strSearch = SearchTerm(addrHex.ToString().c_str());

				        if (fAddrMiner(hashLastBlock.GetHex().c_str(), strSearch.c_str()))
			 	        {
						    addrMiner = CEcoinAddress(addr);
					        fMatch = true;
					    }
				        else
				        {
						    fMatch = false;
						    CKeyID keyID = pubKey.GetReservedKey().GetID();
						    addrMiner.Set(keyID);
					    }
			        }
		        }
		    }
	    }
    }

	return boost::make_tuple(fMatch, addrMiner);

}

// CreateNewBlock: create new block (without proof-of-work/proof-of-stake)
CBlock* CreateNewBlock(CWallet* pwallet, bool fProofOfStake)
{

	bool fMatch = false;
	CBlockIndex* pindexPrev = pindexBest;
	CEcoinAddress addrMiner;
	CReserveKey reservekey(pwallet);

    // Create new block
    auto_ptr<CBlock> pblock(new CBlock());
    if (!pblock.get())
        return NULL;

    unsigned int nBlockHeight = pindexPrev->nHeight;
   	ProofOfTx hashAddr = ProofOfTxSearch(nBlockHeight, reservekey);
    fMatch = hashAddr.get<0>();

    // Create coinbase tx
    CTransaction txNew;
    txNew.vin.resize(1);
    txNew.vin[0].prevout.SetNull();

    if (!fProofOfStake && !fMatch)
    {
        txNew.vout.resize(1);
        txNew.vout[0].scriptPubKey.SetDestination(reservekey.GetReservedKey().GetID());
    }
    else if (!fProofOfStake && fMatch)
    {
        txNew.vout.resize(2);
        txNew.vout[0].scriptPubKey.SetDestination(reservekey.GetReservedKey().GetID());
        addrMiner = hashAddr.get<1>();
        CScript txPubKey;
        CTxDestination txDestination = addrMiner.Get();
        txPubKey.SetDestination(txDestination);
        txNew.vout[1].scriptPubKey = txPubKey;
    }
    else if (fProofOfStake)
    {
        txNew.vout.resize(1);
        txNew.vout[0].SetEmpty();
    }


    pblock->vtx.push_back(txNew);
    unsigned int nBlockMaxSize = GetArg("-blockmaxsize", MAX_BLOCK_SIZE_GEN/2);
    nBlockMaxSize = std::max((unsigned int)1000, std::min((unsigned int)(MAX_BLOCK_SIZE-1000), nBlockMaxSize));

    unsigned int nBlockPrioritySize = GetArg("-blockprioritysize", 27000);
    nBlockPrioritySize = std::min(nBlockMaxSize, nBlockPrioritySize);

    unsigned int nBlockMinSize = GetArg("-blockminsize", 0);
    nBlockMinSize = std::min(nBlockMaxSize, nBlockMinSize);

    int64 nMinTxFee = MIN_TX_FEE;
    if (mapArgs.count("-mintxfee"))
        ParseMoney(mapArgs["-mintxfee"], nMinTxFee);

    pblock->nBits = GetNextTargetRequired(pindexPrev, fProofOfStake);

    int64 nFees = 0;
    {
        LOCK2(cs_main, mempool.cs);
        CBlockIndex* pindexPrev = pindexBest;
        CTxDB txdb("r");

        // Priority order to process transactions
        list<COrphan> vOrphan; // list memory doesn't move
        map<uint256, vector<COrphan*> > mapDependers;

        // This vector will be sorted into a priority queue:
        vector<TxPriority> vecPriority;
        vecPriority.reserve(mempool.mapTx.size());
        for (map<uint256, CTransaction>::iterator mi = mempool.mapTx.begin(); mi != mempool.mapTx.end(); ++mi)
        {
            CTransaction& tx = (*mi).second;
            if (tx.IsCoinBase() || tx.IsCoinStake() || !tx.IsFinal())
                continue;

            COrphan* porphan = NULL;
            double dPriority = 0;
            int64 nTotalIn = 0;
            bool fMissingInputs = false;
            BOOST_FOREACH(const CTxIn& txin, tx.vin)
            {
                // Read prev transaction
                CTransaction txPrev;
                CTxIndex txindex;
                if (!txPrev.ReadFromDisk(txdb, txin.prevout, txindex))
                {
                    // This should never happen; all transactions in the memory
                    // pool should connect to either transactions in the chain
                    // or other transactions in the memory pool.
                    if (!mempool.mapTx.count(txin.prevout.hash))
                    {
                        printf("ERROR: mempool transaction missing input\n");
                        if (fDebug) assert("mempool transaction missing input" == 0);
                        fMissingInputs = true;
                        if (porphan)
                            vOrphan.pop_back();
                        break;
                    }

                    // Has to wait for dependencies
                    if (!porphan)
                    {
                        // Use list for automatic deletion
                        vOrphan.push_back(COrphan(&tx));
                        porphan = &vOrphan.back();
                    }
                    mapDependers[txin.prevout.hash].push_back(porphan);
                    porphan->setDependsOn.insert(txin.prevout.hash);
                    nTotalIn += mempool.mapTx[txin.prevout.hash].vout[txin.prevout.n].nValue;
                    continue;
                }
                int64 nValueIn = txPrev.vout[txin.prevout.n].nValue;
                nTotalIn += nValueIn;

                int nConf = txindex.GetDepthInMainChain();
                dPriority += (double)nValueIn * nConf;
            }
            if (fMissingInputs) continue;

            unsigned int nTxSize = ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
            dPriority /= nTxSize;

            double dFeePerKb =  double(nTotalIn-tx.GetValueOut()) / (double(nTxSize)/1000.0);

            if (porphan)
            {
                porphan->dPriority = dPriority;
                porphan->dFeePerKb = dFeePerKb;
            }
            else
                vecPriority.push_back(TxPriority(dPriority, dFeePerKb, &(*mi).second));
        }

        // Collect transactions into block
        map<uint256, CTxIndex> mapTestPool;
        uint64 nBlockSize = 1000;
        uint64 nBlockTx = 0;
        int nBlockSigOps = 100;
        bool fSortedByFee = (nBlockPrioritySize <= 0);

        TxPriorityCompare comparer(fSortedByFee);
        std::make_heap(vecPriority.begin(), vecPriority.end(), comparer);

        while (!vecPriority.empty())
        {
            // Take highest priority transaction off the priority queue:
            double dPriority = vecPriority.front().get<0>();
            double dFeePerKb = vecPriority.front().get<1>();
            CTransaction& tx = *(vecPriority.front().get<2>());

            std::pop_heap(vecPriority.begin(), vecPriority.end(), comparer);
            vecPriority.pop_back();

            // Size limits
            unsigned int nTxSize = ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
            if (nBlockSize + nTxSize >= nBlockMaxSize)
                continue;

            // Legacy limits on sigOps:
            unsigned int nTxSigOps = tx.GetLegacySigOpCount();
            if (nBlockSigOps + nTxSigOps >= MAX_BLOCK_SIGOPS)
                continue;

            // Timestamp limit
            if (tx.nTime > GetAdjustedTime() || (fProofOfStake && tx.nTime > pblock->vtx[0].nTime))
                continue;

            // Simplify transaction fee - allow free = false
            int64 nMinFee = tx.GetMinFee(nBlockSize, false, GMF_BLOCK);

            // Skip free transactions if we're past the minimum block size:
            if (fSortedByFee && (dFeePerKb < nMinTxFee) && (nBlockSize + nTxSize >= nBlockMinSize))
                continue;

            if (!fSortedByFee &&
                ((nBlockSize + nTxSize >= nBlockPrioritySize) || (dPriority < COIN * 144 / 250)))
            {
                fSortedByFee = true;
                comparer = TxPriorityCompare(fSortedByFee);
                std::make_heap(vecPriority.begin(), vecPriority.end(), comparer);
            }

            map<uint256, CTxIndex> mapTestPoolTmp(mapTestPool);
            MapPrevTx mapInputs;
            bool fInvalid;
            if (!tx.FetchInputs(txdb, mapTestPoolTmp, false, true, mapInputs, fInvalid))
                continue;

            int64 nTxFees = tx.GetValueIn(mapInputs)-tx.GetValueOut();
            if (nTxFees < nMinFee)
                continue;

            nTxSigOps += tx.GetP2SHSigOpCount(mapInputs);
            if (nBlockSigOps + nTxSigOps >= MAX_BLOCK_SIGOPS)
                continue;

            if (!tx.ConnectInputs(txdb, mapInputs, mapTestPoolTmp, CDiskTxPos(1,1,1), pindexPrev, false, true))
                continue;
            mapTestPoolTmp[tx.GetHash()] = CTxIndex(CDiskTxPos(1,1,1), tx.vout.size());
            swap(mapTestPool, mapTestPoolTmp);

            pblock->vtx.push_back(tx);
            nBlockSize += nTxSize;
            ++nBlockTx;
            nBlockSigOps += nTxSigOps;
            nFees += nTxFees;

            if (fDebug && GetBoolArg("-printpriority"))
            {
                printf("priority %.1f feeperkb %.1f txid %s\n",
                       dPriority, dFeePerKb, tx.GetHash().ToString().c_str());
            }

            uint256 hash = tx.GetHash();
            if (mapDependers.count(hash))
            {
                BOOST_FOREACH(COrphan* porphan, mapDependers[hash])
                {
                    if (!porphan->setDependsOn.empty())
                    {
                        porphan->setDependsOn.erase(hash);
                        if (porphan->setDependsOn.empty())
                        {
                            vecPriority.push_back(TxPriority(porphan->dPriority, porphan->dFeePerKb, porphan->ptx));
                            std::push_heap(vecPriority.begin(), vecPriority.end(), comparer);
                        }
                    }
                }
            }
        }

        nLastBlockTx = nBlockTx;
        nLastBlockSize = nBlockSize;

        if (fDebug && GetBoolArg("-printpriority"))
            printf("CreateNewBlock(): total size %" PRI64u"\n", nBlockSize);

        if (!fProofOfStake && nBlockHeight+1 <= 57000)
        {
			if (!fMatch)
			    pblock->vtx[0].vout[0].nValue = GetProofOfWorkReward(pindexPrev->nHeight+1, pindexPrev->GetBlockHash());
            else
            {
            	pblock->vtx[0].vout[0].nValue = (GetProofOfWorkReward(pindexPrev->nHeight+1, pindexPrev->GetBlockHash())/2);
            	pblock->vtx[0].vout[1].nValue = (GetProofOfWorkReward(pindexPrev->nHeight+1, pindexPrev->GetBlockHash())/2);
			}
		}
		else if (!fProofOfStake && nBlockHeight+1 > 57000)
		{
		    if (!fMatch)
			    pblock->vtx[0].vout[0].nValue = GetProofOfWorkReward(pindexPrev->nHeight+1, pindexPrev->GetBlockHash());
		    else
		    {
		        pblock->vtx[0].vout[0].nValue = (GetProofOfWorkReward(pindexPrev->nHeight+1, pindexPrev->GetBlockHash())*0.95);
		        pblock->vtx[0].vout[1].nValue = (GetProofOfWorkReward(pindexPrev->nHeight+1, pindexPrev->GetBlockHash())*0.05);
			}
		}

        pblock->hashPrevBlock  = pindexPrev->GetBlockHash();
        pblock->nTime          = max(pindexPrev->GetMedianTimePast()+1, pblock->GetMaxTransactionTime());
        pblock->nTime          = max(pblock->GetBlockTime(), PastDrift(pindexPrev->GetBlockTime()));
        if (!fProofOfStake)
            pblock->UpdateTime(pindexPrev);
        pblock->nNonce         = 0;
    }

    return pblock.release();
}

void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int& 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
    pblock->vtx[0].vin[0].scriptSig = (CScript() << nHeight << CBigNum(nExtraNonce)) + COINBASE_FLAGS;
    assert(pblock->vtx[0].vin[0].scriptSig.size() <= 100);

    pblock->hashMerkleRoot = pblock->BuildMerkleTree();
}

void FormatHashBuffers(CBlock* pblock, char* pmidstate, char* pdata, char* phash1)
{
    struct
    {
        struct unnamed2
        {
            int nVersion;
            uint256 hashPrevBlock;
            uint256 hashMerkleRoot;
            unsigned int nTime;
            unsigned int nBits;
            unsigned int nNonce;
        }
        block;
        unsigned char pchPadding0[64];
        uint256 hash1;
        unsigned char pchPadding1[64];
    }
    tmp;
    memset(&tmp, 0, sizeof(tmp));

    tmp.block.nVersion       = pblock->nVersion;
    tmp.block.hashPrevBlock  = pblock->hashPrevBlock;
    tmp.block.hashMerkleRoot = pblock->hashMerkleRoot;
    tmp.block.nTime          = pblock->nTime;
    tmp.block.nBits          = pblock->nBits;
    tmp.block.nNonce         = pblock->nNonce;

    FormatHashBlocks(&tmp.block, sizeof(tmp.block));
    FormatHashBlocks(&tmp.hash1, sizeof(tmp.hash1));

    // Byte swap all the input buffer
    for (unsigned int i = 0; i < sizeof(tmp)/4; i++)
        ((unsigned int*)&tmp)[i] = ByteReverse(((unsigned int*)&tmp)[i]);

    // Precalc the first half of the first hash, which stays constant
    SHA256Transform(pmidstate, &tmp.block, pSHA256InitState);

    memcpy(pdata, &tmp.block, 128);
    memcpy(phash1, &tmp.hash1, 64);
}

bool CheckWork(CBlock* pblock, CWallet& wallet, CReserveKey& reservekey)
{
    uint256 hashBlock = pblock->GetHash();
    uint256 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();

    if(!pblock->IsProofOfWork())
        return error("CheckWork() : %s is not a proof-of-work block", hashBlock.GetHex().c_str());

    if (hashBlock > hashTarget)
        return error("CheckWork() : proof-of-work not meeting target");

    printf("CheckWork() : new proof-of-work block found  \n  hash: %s  \ntarget: %s\n", hashBlock.GetHex().c_str(), hashTarget.GetHex().c_str());
    pblock->print();
    printf("generated %s\n", FormatMoney(pblock->vtx[0].vout[0].nValue).c_str());

    {
        LOCK(cs_main);
        if (pblock->hashPrevBlock != hashBestChain)
            return error("CheckWork() : generated block is stale");

        reservekey.KeepKey();

        {
            LOCK(wallet.cs_wallet);
            wallet.mapRequestCount[hashBlock] = 0;
        }

        if (!ProcessBlock(NULL, pblock))
            return error("CheckWork() : ProcessBlock, block not accepted");
    }

    return true;
}

bool CheckStake(CBlock* pblock, CWallet& wallet)
{
    uint256 proofHash = 0, hashTarget = 0;
    uint256 hashBlock = pblock->GetHash();

    if(!pblock->IsProofOfStake())
        return error("CheckStake() : %s is not a proof-of-stake block", hashBlock.GetHex().c_str());

    // verify hash target and signature of coinstake tx
    if (!CheckProofOfStake(pblock->vtx[1], pblock->nBits, proofHash, hashTarget))
        return error("CheckStake() : proof-of-stake checking failed");

    printf("CheckStake() : new proof-of-stake block found  \n  hash: %s \nproofhash: %s  \ntarget: %s\n", hashBlock.GetHex().c_str(), proofHash.GetHex().c_str(), hashTarget.GetHex().c_str());
    pblock->print();
    printf("out %s\n", FormatMoney(pblock->vtx[1].GetValueOut()).c_str());

    {
        LOCK(cs_main);
        if (pblock->hashPrevBlock != hashBestChain)
            return error("CheckStake() : generated block is stale");

        {
            LOCK(wallet.cs_wallet);
            wallet.mapRequestCount[hashBlock] = 0;
        }

        if (!ProcessBlock(NULL, pblock))
            return error("CheckStake() : ProcessBlock, block not accepted");
    }

    return true;
}

void StakeMiner(CWallet *pwallet)
{
    SetThreadPriority(THREAD_PRIORITY_LOWEST);

    // Make this thread recognisable as the mining thread
    RenameThread("ecoin-miner");

    // Each thread has its own counter
    unsigned int nExtraNonce = 0;

    while (true)
    {
        if (fShutdown)
            return;

        while (pwallet->IsLocked())
        {
            //strMintWarning = strMintMessage;
            Sleep(1000);
            if (fShutdown)
                return;
        }

        while (vNodes.empty() || IsInitialBlockDownload())
        {
            Sleep(1000);
            if (fShutdown)
                return;
        }

        CBlockIndex* pindexPrev = pindexBest;

        auto_ptr<CBlock> pblock(CreateNewBlock(pwallet, true));
        if (!pblock.get())
            return;
        IncrementExtraNonce(pblock.get(), pindexPrev, nExtraNonce);

        // Trying to sign a block
        if (pblock->SignBlock(*pwallet))
        {
            strMintWarning = _("Stake generation: new block found!");
            SetThreadPriority(THREAD_PRIORITY_NORMAL);
            CheckStake(pblock.get(), *pwallet);
            SetThreadPriority(THREAD_PRIORITY_LOWEST);
            Sleep(500);
        }
        else
            Sleep(nMinerSleep);

        continue;
    }
}