X-Git-Url: https://git.novaco.in/?a=blobdiff_plain;f=src%2Fkernel.cpp;h=ae686be5694dbd5870227bfca3490ab87ec6bcde;hb=642beb691d0ea6dfb101ff1bbbfdfc4f8d0289c0;hp=5a8d3d672068c91e284113e644c4d28aee90a977;hpb=d8f8063eda45b8dec864b28bb98839a2dd3a8170;p=novacoin.git diff --git a/src/kernel.cpp b/src/kernel.cpp index 5a8d3d6..ae686be 100644 --- a/src/kernel.cpp +++ b/src/kernel.cpp @@ -12,6 +12,15 @@ using namespace std; extern int nStakeMaxAge; extern int nStakeTargetSpacing; +// Protocol switch time for fixed kernel modifier interval +unsigned int nModifierSwitchTime = 1413763200; // Mon, 20 Oct 2014 00:00:00 GMT +unsigned int nModifierTestSwitchTime = 1397520000; // Tue, 15 Apr 2014 00:00:00 GMT + +// Note: user must upgrade before the protocol switch deadline, otherwise it's required to +// re-download the blockchain. The timestamp of upgrade is recorded in the blockchain +// database. +unsigned int nModifierUpgradeTime = 0; + typedef std::map MapModifierCheckpoints; // Hard checkpoints of stake modifiers to ensure they are deterministic @@ -23,6 +32,9 @@ static std::map mapStakeModifierCheckpoints = ( 37092, 0xd230afccu ) ( 44200, 0x05370164u ) ( 65000, 0xc8e7be6au ) + ( 68600, 0x73a8cc4cu ) + ( 92161, 0xe21a911au ) + ( 98661, 0xd20c44d4u ) ; // Hard checkpoints of stake modifiers to ensure they are deterministic (testNet) @@ -31,6 +43,12 @@ static std::map mapStakeModifierCheckpointsTestNet = ( 0, 0x0e00670bu ) ; +// Whether the given block is subject to new modifier protocol +bool IsFixedModifierInterval(unsigned int nTimeBlock) +{ + return (nTimeBlock >= (fTestNet? nModifierTestSwitchTime : nModifierSwitchTime)); +} + // Get time weight int64 GetWeight(int64 nIntervalBeginning, int64 nIntervalEnd) { @@ -132,15 +150,17 @@ static bool SelectBlockFromCandidates(vector >& vSortedByTi // block. This is to make it difficult for an attacker to gain control of // additional bits in the stake modifier, even after generating a chain of // blocks. -bool ComputeNextStakeModifier(const CBlockIndex* pindexPrev, uint64& nStakeModifier, bool& fGeneratedStakeModifier) +bool ComputeNextStakeModifier(const CBlockIndex* pindexCurrent, uint64& nStakeModifier, bool& fGeneratedStakeModifier) { nStakeModifier = 0; fGeneratedStakeModifier = false; + const CBlockIndex* pindexPrev = pindexCurrent->pprev; if (!pindexPrev) { fGeneratedStakeModifier = true; return true; // genesis block's modifier is 0 } + // First find current stake modifier and its generation block time // if it's not old enough, return the same stake modifier int64 nModifierTime = 0; @@ -148,10 +168,35 @@ bool ComputeNextStakeModifier(const CBlockIndex* pindexPrev, uint64& nStakeModif return error("ComputeNextStakeModifier: unable to get last modifier"); if (fDebug) { - printf("ComputeNextStakeModifier: prev modifier=0x%016"PRI64x" time=%s\n", nStakeModifier, DateTimeStrFormat(nModifierTime).c_str()); + printf("ComputeNextStakeModifier: prev modifier=0x%016"PRI64x" time=%s epoch=%u\n", nStakeModifier, DateTimeStrFormat(nModifierTime).c_str(), (unsigned int)nModifierTime); } if (nModifierTime / nModifierInterval >= pindexPrev->GetBlockTime() / nModifierInterval) + { + if (fDebug) + { + printf("ComputeNextStakeModifier: no new interval keep current modifier: pindexPrev nHeight=%d nTime=%u\n", pindexPrev->nHeight, (unsigned int)pindexPrev->GetBlockTime()); + } return true; + } + if (nModifierTime / nModifierInterval >= pindexCurrent->GetBlockTime() / nModifierInterval) + { + // fixed interval protocol requires current block timestamp also be in a different modifier interval + if (IsFixedModifierInterval(pindexCurrent->nTime)) + { + if (fDebug) + { + printf("ComputeNextStakeModifier: no new interval keep current modifier: pindexCurrent nHeight=%d nTime=%u\n", pindexCurrent->nHeight, (unsigned int)pindexCurrent->GetBlockTime()); + } + return true; + } + else + { + if (fDebug) + { + printf("ComputeNextStakeModifier: old modifier at block %s not meeting fixed modifier interval: pindexCurrent nHeight=%d nTime=%u\n", pindexCurrent->GetBlockHash().ToString().c_str(), pindexCurrent->nHeight, (unsigned int)pindexCurrent->GetBlockTime()); + } + } + } // Sort candidate blocks by timestamp vector > vSortedByTimestamp; @@ -253,6 +298,15 @@ static bool GetKernelStakeModifier(uint256 hashBlockFrom, uint64& nStakeModifier return true; } +bool GetKernelStakeModifier(uint256 hashBlockFrom, uint64& nStakeModifier) +{ + int nStakeModifierHeight; + int64 nStakeModifierTime; + + return GetKernelStakeModifier(hashBlockFrom, nStakeModifier, nStakeModifierHeight, nStakeModifierTime, false); +} + + // ppcoin kernel protocol // coinstake must meet hash target according to the protocol: // kernel (input 0) must meet the formula @@ -335,6 +389,82 @@ bool CheckStakeKernelHash(unsigned int nBits, const CBlock& blockFrom, unsigned return true; } +// Scan given coins set for kernel solution +bool ScanForStakeKernelHash(CoinsSet &setCoins, MetaMap &mapMeta, KernelSearchSettings &settings, CoinsSet::value_type &kernelcoin, unsigned int &nTimeTx, unsigned int &nBlockTime) +{ + uint256 hashProofOfStake = 0, targetProofOfStake = 0; + + for(CoinsSet::const_iterator pcoin = setCoins.begin(); pcoin != setCoins.end(); pcoin++) + { + if (!fCoinsDataActual) + break; + + MetaMap::const_iterator mi = mapMeta.find(pcoin->first->GetHash()); + if (mi == mapMeta.end()) + { + if (fDebug) + printf("Unable to find %s in mapMeta, stopping\n", pcoin->first->GetHash().GetHex().c_str()); + fCoinsDataActual = false; + break; + } + + CTxIndex txindex = (*mi).second.first; + CBlock block = (*mi).second.second.first; + uint64 nStakeModifier = (*mi).second.second.second; + + static int nMaxStakeSearchInterval = 60; + + // only count coins meeting min age requirement + if (nStakeMinAge + block.nTime > settings.nTime - nMaxStakeSearchInterval) + continue; + + // Transaction offset inside block + unsigned int nTxOffset = txindex.pos.nTxPos - txindex.pos.nBlockPos; + + // Current timestamp scanning interval + unsigned int nCurrentSearchInterval = min((int64)settings.nSearchInterval, (int64)nMaxStakeSearchInterval); + + nBlockTime = block.nTime; + CBigNum bnTargetPerCoinDay; + bnTargetPerCoinDay.SetCompact(settings.nBits); + int64 nValueIn = pcoin->first->vout[pcoin->second].nValue; + + // Search backward in time from the given timestamp + // Search nSearchInterval seconds back up to nMaxStakeSearchInterval + // Stopping search in case of shutting down or cache invalidation + for (unsigned int n=0; nfirst->nTime, (int64)nTimeTx) / COIN / (24 * 60 * 60); + targetProofOfStake = (bnCoinDayWeight * bnTargetPerCoinDay).getuint256(); + + // Build kernel + CDataStream ss(SER_GETHASH, 0); + ss << nStakeModifier; + ss << nBlockTime << nTxOffset << pcoin->first->nTime << pcoin->second << nTimeTx; + + // Calculate kernel hash + hashProofOfStake = Hash(ss.begin(), ss.end()); + + if (bnCoinDayWeight * bnTargetPerCoinDay >= CBigNum(hashProofOfStake)) + { + if (fDebug) + printf("nStakeModifier=0x%016"PRI64x", nBlockTime=%u nTxOffset=%u nTxPrevTime=%u nVout=%u nTimeTx=%u hashProofOfStake=%s Success=true\n", + nStakeModifier, nBlockTime, nTxOffset, pcoin->first->nTime, pcoin->second, nTimeTx, hashProofOfStake.GetHex().c_str()); + + kernelcoin = *pcoin; + return true; + } + + if (fDebug) + printf("nStakeModifier=0x%016"PRI64x", nBlockTime=%u nTxOffset=%u nTxPrevTime=%u nTxNumber=%u nTimeTx=%u hashProofOfStake=%s Success=false\n", + nStakeModifier, nBlockTime, nTxOffset, pcoin->first->nTime, pcoin->second, nTimeTx, hashProofOfStake.GetHex().c_str()); + } + } + + return false; +} + // Check kernel hash target and coinstake signature bool CheckProofOfStake(const CTransaction& tx, unsigned int nBits, uint256& hashProofOfStake, uint256& targetProofOfStake) { @@ -351,8 +481,12 @@ bool CheckProofOfStake(const CTransaction& tx, unsigned int nBits, uint256& hash if (!txPrev.ReadFromDisk(txdb, txin.prevout, txindex)) return tx.DoS(1, error("CheckProofOfStake() : INFO: read txPrev failed")); // previous transaction not in main chain, may occur during initial download +#ifndef USE_LEVELDB + txdb.Close(); +#endif + // Verify signature - if (!VerifySignature(txPrev, tx, 0, true, 0)) + if (!VerifySignature(txPrev, tx, 0, MANDATORY_SCRIPT_VERIFY_FLAGS, 0)) return tx.DoS(100, error("CheckProofOfStake() : VerifySignature failed on coinstake %s", tx.GetHash().ToString().c_str())); // Read block header @@ -366,13 +500,6 @@ bool CheckProofOfStake(const CTransaction& tx, unsigned int nBits, uint256& hash return true; } -// Check whether the coinstake timestamp meets protocol -bool CheckCoinStakeTimestamp(int64 nTimeBlock, int64 nTimeTx) -{ - // v0.3 protocol - return (nTimeBlock == nTimeTx); -} - // Get stake modifier checksum unsigned int GetStakeModifierChecksum(const CBlockIndex* pindex) {