X-Git-Url: https://git.novaco.in/?p=novacoin.git;a=blobdiff_plain;f=src%2Fkernel.cpp;h=b18ae2b7c180f836f687b46f019c134ba17cd513;hp=96933b6b4af180a169336fd87168a03dbc5afb5a;hb=89d4073d0a6545330af16bb8b2352881b6f55cf5;hpb=93d7885fdc0af545f6a56c5f924f893aebf05b5a diff --git a/src/kernel.cpp b/src/kernel.cpp index 96933b6..b18ae2b 100644 --- a/src/kernel.cpp +++ b/src/kernel.cpp @@ -1,31 +1,108 @@ // Copyright (c) 2012-2013 The PPCoin developers +// Copyright (c) 2013-2015 The Novacoin developers +// Distributed under the MIT/X11 software license, see the accompanying +// file COPYING or http://www.opensource.org/licenses/mit-license.php. // Distributed under the MIT/X11 software license, see the accompanying // file COPYING or http://www.opensource.org/licenses/mit-license.php. #include #include "kernel.h" -#include "db.h" +#include "kernel_worker.h" +#include "txdb.h" + +extern unsigned int nStakeMaxAge; +extern unsigned int nStakeTargetSpacing; 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 static std::map mapStakeModifierCheckpoints = boost::assign::map_list_of ( 0, 0x0e00670bu ) - ( 6000, 0xb7cbc5d3u ) - ( 9690, 0x97dcdafau ) ( 12661, 0x5d84115du ) - ( 19600, 0xdded1b8du ) - ( 21800, 0x0daa1aaau ) - ( 26174, 0xaf9983dcu ) + (143990, 0x9c592c78u ) + (149000, 0x48f2bdc4u ) + (160000, 0x789df0f0u ) + (200000, 0x01ec1503u ) + (221047, 0x0b39ef50u ) + (243100, 0xe928d83au ) ; +// Hard checkpoints of stake modifiers to ensure they are deterministic (testNet) +static std::map mapStakeModifierCheckpointsTestNet = + boost::assign::map_list_of + ( 0, 0x0e00670bu ) + ; + +// Pregenerated entropy bits table (from genesis to #9689) +// +// Bits are packed into array of 256 bit integers: +// +// * array index calculated as nHeight / 256 +// * position of bit is calculated as nHeight & 0xFF. +// +const uint256 entropyStore[] = { + uint256("0x4555b4dcc1d690ddd9b810c90c66e82b18bf4f43cc887246c418383ec120a5ab"), + uint256("0xaa6d1198412fa77608addf6549c9198a22155e8afd7a9ded6179f6b7cfc66b0c"), + uint256("0x9442fabfa4116fb14a9769c2eea003845a1f5c3a0260f36b497d68f3a3cd4078"), + uint256("0x0e769042a9a98e42388195d699574b822d06515f7053ad884c53d7ee059f05b1"), + uint256("0x7005aac20baf70251aebfe3f1b95987d83ef1e3e6963de8fed601d4dd07bf7cf"), + uint256("0x58952c5c3de188f2e33c38d3f53d7bf44f9bc545a4289d266696273fa821be66"), + uint256("0x50b6c2ed780c08aaec3f7665b1b6004206243e3866456fc910b83b52d07eeb63"), + uint256("0x563841eefca85ba3384986c58100408ae3f1ba2ac727e1ac910ce154a06c702f"), + uint256("0x79275b03938b3e27a9b01a7f7953c6c487c58355f5d4169accfbb800213ffd13"), + uint256("0xd783f2538b3ed18f135af90adc687c5646d93aeaeaabc6667be94f7aa0a2d366"), + uint256("0xb441d0c175c40c8e88b09d88ea008af79cbed2d28219427d2e72fda682974db8"), + uint256("0x3204c43bd41f2e19628af3b0c9aca3db15bca4c8705d51056e7b17a319c04715"), + uint256("0x7e80e6ab7857d8f2f261a0a49c783bd800b365b8c9b85cc0e13f73904b0dcaa9"), + uint256("0xefaaee60ed82d2ad145c0e347941fdb131eb8fd289a45eef07121a93f283c5f1"), + uint256("0x3efc86e4334da332c1fd4c12513c40cff689f3efdc7f9913230822adacdda4f9"), + uint256("0xf0d6b8f38599a017fa35d1fbbf9ef51eca5ebc5b286aadba40c4c3e1d9bace0c"), + uint256("0x286a67f27323486036a0a92d35382fc8963c0c00bad331723318b4b9fdb2b56e"), + uint256("0xecbfaaa6567c54f08c4d5bd0118a2d7b58740f42cbfc73aa1536c1f5f76de87c"), + uint256("0xf9a4de1c5c46520de5aaf10d3796cf0e27ddce98b3398357f5726a949664e308"), + uint256("0xd75e6c4dc4be08401e3478d2467d9ab96a62af4f255c04a82c41af0de0a487bb"), + uint256("0x1a82c3bc6ad6047294c16571b5e2b7316c97bf8813e7da15798b9820d67e39f2"), + uint256("0xb49be0080de564e01829ded7e7971979565a741c5975dc9978dcc020192d396c"), + uint256("0x0d8eed113be67663b5a15a0625a9b49792b5ea59c005c4f405914877acab7000"), + uint256("0x8f9d46e2bc05a218ffa942965b747056197d393b097085523640cd59e07fe7c7"), + uint256("0x7a63ab40bc7f40ac2ebe9ede438d97b45fa6ed6f8419016da8d5f7a670111dda"), + uint256("0x63fbcc080448c43d6cf915c958314feff7a95a52ba43a68c05fc281d3a522d25"), + uint256("0xf834cf824c326d3ea861ea1e85dc3289265e37045981e28208e7344a7f8081d7"), + uint256("0xb4edc22ec98cc49b2f5af5bae3f52f5e6058280f74f2c432c2dd89ae49acceb8"), + uint256("0x0fe596037dcf81bf5c64f39755261c404ed088af5c8c31dd7549b6657ee92365"), + uint256("0xbbad51a0aeba254b01d18c328de9e932b9b859b61e622c325d64e2211b5e413d"), + uint256("0xabf0194cc787be938bc51c7fdf1cae4ec79e65ebab8fa8b8f40541c44ef384b0"), + uint256("0x83bc12d6fdbd3e854cb91c4ca7dfba3c38e8714121af88c8a8abdb33e5002438"), + uint256("0x71a2513026cabaedcbe55aeb6dc8049e5b763a3f54f10c33dd333624f764b38c"), + uint256("0xee6725632ff5c025dff6a18cd059875dcae20f399b03bccba13d9d5fcf6d9d9a"), + uint256("0xa168a2741d1e7e50cc74b79f695c25ffd3576e6bd61353c2a20e569fd63b2dac"), + uint256("0x6e462d2a87bfde9398b6747f94a8ed6a01e4d96c5b4372df5c910c106c48bd13"), + uint256("0x8eeb696181957c4b22434028990f49cb30006827c73860e77e2eecf5c38be99d"), + uint256("0x3188aaa65877b166f05cdc48f55b1f77a7d6fb221c395596d990ae5647e9ba96") +}; + +// Whether the given block is subject to new modifier protocol +bool IsFixedModifierInterval(unsigned int nTimeBlock) +{ + return (nTimeBlock >= (fTestNet? nModifierTestSwitchTime : nModifierSwitchTime)); +} + // Get the last stake modifier and its generation time from a given block -static bool GetLastStakeModifier(const CBlockIndex* pindex, uint64& nStakeModifier, int64& nModifierTime) +static bool GetLastStakeModifier(const CBlockIndex* pindex, uint64_t& nStakeModifier, int64_t& nModifierTime) { if (!pindex) return error("GetLastStakeModifier: null pindex"); @@ -39,16 +116,16 @@ static bool GetLastStakeModifier(const CBlockIndex* pindex, uint64& nStakeModifi } // Get selection interval section (in seconds) -static int64 GetStakeModifierSelectionIntervalSection(int nSection) +static int64_t GetStakeModifierSelectionIntervalSection(int nSection) { assert (nSection >= 0 && nSection < 64); return (nModifierInterval * 63 / (63 + ((63 - nSection) * (MODIFIER_INTERVAL_RATIO - 1)))); } // Get stake modifier selection interval (in seconds) -static int64 GetStakeModifierSelectionInterval() +static int64_t GetStakeModifierSelectionInterval() { - int64 nSelectionInterval = 0; + int64_t nSelectionInterval = 0; for (int nSection=0; nSection<64; nSection++) nSelectionInterval += GetStakeModifierSelectionIntervalSection(nSection); return nSelectionInterval; @@ -57,16 +134,13 @@ static int64 GetStakeModifierSelectionInterval() // select a block from the candidate blocks in vSortedByTimestamp, excluding // already selected blocks in vSelectedBlocks, and with timestamp up to // nSelectionIntervalStop. -static bool SelectBlockFromCandidates( - vector >& vSortedByTimestamp, - map& mapSelectedBlocks, - int64 nSelectionIntervalStop, uint64 nStakeModifierPrev, - const CBlockIndex** pindexSelected) +static bool SelectBlockFromCandidates(vector >& vSortedByTimestamp, map& mapSelectedBlocks, + int64_t nSelectionIntervalStop, uint64_t nStakeModifierPrev, const CBlockIndex** pindexSelected) { bool fSelected = false; uint256 hashBest = 0; *pindexSelected = (const CBlockIndex*) 0; - BOOST_FOREACH(const PAIRTYPE(int64, uint256)& item, vSortedByTimestamp) + BOOST_FOREACH(const PAIRTYPE(int64_t, uint256)& item, vSortedByTimestamp) { if (!mapBlockIndex.count(item.second)) return error("SelectBlockFromCandidates: failed to find block index for candidate block %s", item.second.ToString().c_str()); @@ -89,13 +163,13 @@ static bool SelectBlockFromCandidates( if (fSelected && hashSelection < hashBest) { hashBest = hashSelection; - *pindexSelected = (const CBlockIndex*) pindex; + *pindexSelected = pindex; } else if (!fSelected) { fSelected = true; hashBest = hashSelection; - *pindexSelected = (const CBlockIndex*) pindex; + *pindexSelected = pindex; } } if (fDebug && GetBoolArg("-printstakemodifier")) @@ -116,32 +190,59 @@ static bool SelectBlockFromCandidates( // 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_t& 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; + int64_t nModifierTime = 0; if (!GetLastStakeModifier(pindexPrev, nStakeModifier, nModifierTime)) 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" PRIx64 " 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; + vector > vSortedByTimestamp; vSortedByTimestamp.reserve(64 * nModifierInterval / nStakeTargetSpacing); - int64 nSelectionInterval = GetStakeModifierSelectionInterval(); - int64 nSelectionIntervalStart = (pindexPrev->GetBlockTime() / nModifierInterval) * nModifierInterval - nSelectionInterval; + int64_t nSelectionInterval = GetStakeModifierSelectionInterval(); + int64_t nSelectionIntervalStart = (pindexPrev->GetBlockTime() / nModifierInterval) * nModifierInterval - nSelectionInterval; const CBlockIndex* pindex = pindexPrev; while (pindex && pindex->GetBlockTime() >= nSelectionIntervalStart) { @@ -153,8 +254,8 @@ bool ComputeNextStakeModifier(const CBlockIndex* pindexPrev, uint64& nStakeModif sort(vSortedByTimestamp.begin(), vSortedByTimestamp.end()); // Select 64 blocks from candidate blocks to generate stake modifier - uint64 nStakeModifierNew = 0; - int64 nSelectionIntervalStop = nSelectionIntervalStart; + uint64_t nStakeModifierNew = 0; + int64_t nSelectionIntervalStop = nSelectionIntervalStart; map mapSelectedBlocks; for (int nRound=0; nRoundGetStakeEntropyBit()) << nRound); + nStakeModifierNew |= (((uint64_t)pindex->GetStakeEntropyBit()) << nRound); // add the selected block from candidates to selected list mapSelectedBlocks.insert(make_pair(pindex->GetBlockHash(), pindex)); if (fDebug && GetBoolArg("-printstakemodifier")) - printf("ComputeNextStakeModifier: selected round %d stop=%s height=%d bit=%d\n", - nRound, DateTimeStrFormat(nSelectionIntervalStop).c_str(), pindex->nHeight, pindex->GetStakeEntropyBit()); + printf("ComputeNextStakeModifier: selected round %d stop=%s height=%d bit=%d\n", nRound, DateTimeStrFormat(nSelectionIntervalStop).c_str(), pindex->nHeight, pindex->GetStakeEntropyBit()); } // Print selection map for visualization of the selected blocks @@ -196,7 +296,7 @@ bool ComputeNextStakeModifier(const CBlockIndex* pindexPrev, uint64& nStakeModif } if (fDebug) { - printf("ComputeNextStakeModifier: new modifier=0x%016"PRI64x" time=%s\n", nStakeModifierNew, DateTimeStrFormat(pindexPrev->GetBlockTime()).c_str()); + printf("ComputeNextStakeModifier: new modifier=0x%016" PRIx64 " time=%s\n", nStakeModifierNew, DateTimeStrFormat(pindexPrev->GetBlockTime()).c_str()); } nStakeModifier = nStakeModifierNew; @@ -206,7 +306,7 @@ bool ComputeNextStakeModifier(const CBlockIndex* pindexPrev, uint64& nStakeModif // The stake modifier used to hash for a stake kernel is chosen as the stake // modifier about a selection interval later than the coin generating the kernel -static bool GetKernelStakeModifier(uint256 hashBlockFrom, uint64& nStakeModifier, int& nStakeModifierHeight, int64& nStakeModifierTime, bool fPrintProofOfStake) +static bool GetKernelStakeModifier(uint256 hashBlockFrom, uint64_t& nStakeModifier, int& nStakeModifierHeight, int64_t& nStakeModifierTime, bool fPrintProofOfStake) { nStakeModifier = 0; if (!mapBlockIndex.count(hashBlockFrom)) @@ -214,7 +314,7 @@ static bool GetKernelStakeModifier(uint256 hashBlockFrom, uint64& nStakeModifier const CBlockIndex* pindexFrom = mapBlockIndex[hashBlockFrom]; nStakeModifierHeight = pindexFrom->nHeight; nStakeModifierTime = pindexFrom->GetBlockTime(); - int64 nStakeModifierSelectionInterval = GetStakeModifierSelectionInterval(); + int64_t nStakeModifierSelectionInterval = GetStakeModifierSelectionInterval(); const CBlockIndex* pindex = pindexFrom; // loop to find the stake modifier later by a selection interval while (nStakeModifierTime < pindexFrom->GetBlockTime() + nStakeModifierSelectionInterval) @@ -238,6 +338,15 @@ static bool GetKernelStakeModifier(uint256 hashBlockFrom, uint64& nStakeModifier return true; } +bool GetKernelStakeModifier(uint256 hashBlockFrom, uint64_t& nStakeModifier) +{ + int nStakeModifierHeight; + int64_t 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 @@ -245,10 +354,8 @@ static bool GetKernelStakeModifier(uint256 hashBlockFrom, uint64& nStakeModifier // this ensures that the chance of getting a coinstake is proportional to the // amount of coin age one owns. // The reason this hash is chosen is the following: -// nStakeModifier: -// (v0.3) scrambles computation to make it very difficult to precompute -// future proof-of-stake at the time of the coin's confirmation -// (v0.2) nBits (deprecated): encodes all past block timestamps +// nStakeModifier: scrambles computation to make it very difficult to precompute +// future proof-of-stake at the time of the coin's confirmation // txPrev.block.nTime: prevent nodes from guessing a good timestamp to // generate transaction for future advantage // txPrev.offset: offset of txPrev inside block, to reduce the chance of @@ -261,32 +368,31 @@ static bool GetKernelStakeModifier(uint256 hashBlockFrom, uint64& nStakeModifier // quantities so as to generate blocks faster, degrading the system back into // a proof-of-work situation. // -bool CheckStakeKernelHash(unsigned int nBits, const CBlock& blockFrom, unsigned int nTxPrevOffset, const CTransaction& txPrev, const COutPoint& prevout, unsigned int nTimeTx, uint256& hashProofOfStake, bool fPrintProofOfStake) +bool CheckStakeKernelHash(uint32_t nBits, const CBlock& blockFrom, uint32_t nTxPrevOffset, const CTransaction& txPrev, const COutPoint& prevout, uint32_t nTimeTx, uint256& hashProofOfStake, uint256& targetProofOfStake, bool fPrintProofOfStake) { if (nTimeTx < txPrev.nTime) // Transaction timestamp violation return error("CheckStakeKernelHash() : nTime violation"); - unsigned int nTimeBlockFrom = blockFrom.GetBlockTime(); + uint32_t nTimeBlockFrom = blockFrom.GetBlockTime(); if (nTimeBlockFrom + nStakeMinAge > nTimeTx) // Min age requirement return error("CheckStakeKernelHash() : min age violation"); CBigNum bnTargetPerCoinDay; bnTargetPerCoinDay.SetCompact(nBits); - int64 nValueIn = txPrev.vout[prevout.n].nValue; + int64_t nValueIn = txPrev.vout[prevout.n].nValue; - // v0.3 protocol kernel hash weight starts from 0 at the 30-day min age - // this change increases active coins participating the hash and helps - // to secure the network when proof-of-stake difficulty is low - int64 nTimeWeight = min((int64)nTimeTx - txPrev.nTime, (int64)nStakeMaxAge) - nStakeMinAge; - CBigNum bnCoinDayWeight = CBigNum(nValueIn) * nTimeWeight / COIN / (24 * 60 * 60); + uint256 hashBlockFrom = blockFrom.GetHash(); + + CBigNum bnCoinDayWeight = CBigNum(nValueIn) * GetWeight((int64_t)txPrev.nTime, (int64_t)nTimeTx) / COIN / nOneDay; + targetProofOfStake = (bnCoinDayWeight * bnTargetPerCoinDay).getuint256(); // Calculate hash CDataStream ss(SER_GETHASH, 0); - uint64 nStakeModifier = 0; + uint64_t nStakeModifier = 0; int nStakeModifierHeight = 0; - int64 nStakeModifierTime = 0; + int64_t nStakeModifierTime = 0; - if (!GetKernelStakeModifier(blockFrom.GetHash(), nStakeModifier, nStakeModifierHeight, nStakeModifierTime, fPrintProofOfStake)) + if (!GetKernelStakeModifier(hashBlockFrom, nStakeModifier, nStakeModifierHeight, nStakeModifierTime, fPrintProofOfStake)) return false; ss << nStakeModifier; @@ -294,16 +400,15 @@ bool CheckStakeKernelHash(unsigned int nBits, const CBlock& blockFrom, unsigned hashProofOfStake = Hash(ss.begin(), ss.end()); if (fPrintProofOfStake) { - printf("CheckStakeKernelHash() : using modifier 0x%016"PRI64x" at height=%d timestamp=%s for block from height=%d timestamp=%s\n", + printf("CheckStakeKernelHash() : using modifier 0x%016" PRIx64 " at height=%d timestamp=%s for block from height=%d timestamp=%s\n", nStakeModifier, nStakeModifierHeight, DateTimeStrFormat(nStakeModifierTime).c_str(), - mapBlockIndex[blockFrom.GetHash()]->nHeight, + mapBlockIndex[hashBlockFrom]->nHeight, DateTimeStrFormat(blockFrom.GetBlockTime()).c_str()); - printf("CheckStakeKernelHash() : check protocol=%s modifier=0x%016"PRI64x" nTimeBlockFrom=%u nTxPrevOffset=%u nTimeTxPrev=%u nPrevout=%u nTimeTx=%u hashProof=%s\n", - "0.3", + printf("CheckStakeKernelHash() : check modifier=0x%016" PRIx64 " nTimeBlockFrom=%u nTxPrevOffset=%u nTimeTxPrev=%u nPrevout=%u nTimeTx=%u hashTarget=%s hashProof=%s\n", nStakeModifier, nTimeBlockFrom, nTxPrevOffset, txPrev.nTime, prevout.n, nTimeTx, - hashProofOfStake.ToString().c_str()); + targetProofOfStake.ToString().c_str(), hashProofOfStake.ToString().c_str()); } // Now check if proof-of-stake hash meets target protocol @@ -311,22 +416,66 @@ bool CheckStakeKernelHash(unsigned int nBits, const CBlock& blockFrom, unsigned return false; if (fDebug && !fPrintProofOfStake) { - printf("CheckStakeKernelHash() : using modifier 0x%016"PRI64x" at height=%d timestamp=%s for block from height=%d timestamp=%s\n", + printf("CheckStakeKernelHash() : using modifier 0x%016" PRIx64 " at height=%d timestamp=%s for block from height=%d timestamp=%s\n", nStakeModifier, nStakeModifierHeight, DateTimeStrFormat(nStakeModifierTime).c_str(), - mapBlockIndex[blockFrom.GetHash()]->nHeight, + mapBlockIndex[hashBlockFrom]->nHeight, DateTimeStrFormat(blockFrom.GetBlockTime()).c_str()); - printf("CheckStakeKernelHash() : pass protocol=%s modifier=0x%016"PRI64x" nTimeBlockFrom=%u nTxPrevOffset=%u nTimeTxPrev=%u nPrevout=%u nTimeTx=%u hashProof=%s\n", - "0.3", + printf("CheckStakeKernelHash() : pass modifier=0x%016" PRIx64 " nTimeBlockFrom=%u nTxPrevOffset=%u nTimeTxPrev=%u nPrevout=%u nTimeTx=%u hashTarget=%s hashProof=%s\n", nStakeModifier, nTimeBlockFrom, nTxPrevOffset, txPrev.nTime, prevout.n, nTimeTx, - hashProofOfStake.ToString().c_str()); + targetProofOfStake.ToString().c_str(), hashProofOfStake.ToString().c_str()); } return true; } +// Scan given kernel for solution +bool ScanKernelForward(unsigned char *kernel, uint32_t nBits, uint32_t nInputTxTime, int64_t nValueIn, std::pair &SearchInterval, std::vector > &solutions) +{ + // TODO: custom threads amount + + uint32_t nThreads = boost::thread::hardware_concurrency(); + if (nThreads == 0) + { + nThreads = 1; + printf("Warning: hardware_concurrency() failed in %s:%d\n", __FILE__, __LINE__); + } + uint32_t nPart = (SearchInterval.second - SearchInterval.first) / nThreads; + + KernelWorker *workers = new KernelWorker[nThreads]; + + boost::thread_group group; + for(size_t i = 0; i < nThreads; i++) + { + uint32_t nBegin = SearchInterval.first + nPart * i; + uint32_t nEnd = SearchInterval.first + nPart * (i + 1); + workers[i] = KernelWorker(kernel, nBits, nInputTxTime, nValueIn, nBegin, nEnd); + boost::function workerFnc = boost::bind(&KernelWorker::Do, &workers[i]); + group.create_thread(workerFnc); + } + + group.join_all(); + solutions.clear(); + + for(size_t i = 0; i < nThreads; i++) + { + std::vector > ws = workers[i].GetSolutions(); + solutions.insert(solutions.end(), ws.begin(), ws.end()); + } + + delete [] workers; + + if (solutions.size() == 0) + { + // no solutions + return false; + } + + return true; +} + // Check kernel hash target and coinstake signature -bool CheckProofOfStake(const CTransaction& tx, unsigned int nBits, uint256& hashProofOfStake) +bool CheckProofOfStake(const CTransaction& tx, unsigned int nBits, uint256& hashProofOfStake, uint256& targetProofOfStake) { if (!tx.IsCoinStake()) return error("CheckProofOfStake() : called on non-coinstake %s", tx.GetHash().ToString().c_str()); @@ -340,10 +489,13 @@ bool CheckProofOfStake(const CTransaction& tx, unsigned int nBits, uint256& hash CTxIndex txindex; 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 @@ -351,21 +503,14 @@ bool CheckProofOfStake(const CTransaction& tx, unsigned int nBits, uint256& hash if (!block.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, false)) return fDebug? error("CheckProofOfStake() : read block failed") : false; // unable to read block of previous transaction - if (!CheckStakeKernelHash(nBits, block, txindex.pos.nTxPos - txindex.pos.nBlockPos, txPrev, txin.prevout, tx.nTime, hashProofOfStake, fDebug)) + if (!CheckStakeKernelHash(nBits, block, txindex.pos.nTxPos - txindex.pos.nBlockPos, txPrev, txin.prevout, tx.nTime, hashProofOfStake, targetProofOfStake, fDebug)) return tx.DoS(1, error("CheckProofOfStake() : INFO: check kernel failed on coinstake %s, hashProof=%s", tx.GetHash().ToString().c_str(), hashProofOfStake.ToString().c_str())); // may occur during initial download or if behind on block chain sync 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) +uint32_t GetStakeModifierChecksum(const CBlockIndex* pindex) { assert (pindex->pprev || pindex->GetBlockHash() == (!fTestNet ? hashGenesisBlock : hashGenesisBlockTestNet)); // Hash previous checksum with flags, hashProofOfStake and nStakeModifier @@ -375,14 +520,15 @@ unsigned int GetStakeModifierChecksum(const CBlockIndex* pindex) ss << pindex->nFlags << pindex->hashProofOfStake << pindex->nStakeModifier; uint256 hashChecksum = Hash(ss.begin(), ss.end()); hashChecksum >>= (256 - 32); - return hashChecksum.Get64(); + return static_cast(hashChecksum.Get64()); } // Check stake modifier hard checkpoints -bool CheckStakeModifierCheckpoints(int nHeight, unsigned int nStakeModifierChecksum) +bool CheckStakeModifierCheckpoints(int nHeight, uint32_t nStakeModifierChecksum) { - if (fTestNet) return true; // Testnet has no checkpoints - if (mapStakeModifierCheckpoints.count(nHeight)) - return nStakeModifierChecksum == mapStakeModifierCheckpoints[nHeight]; + MapModifierCheckpoints& checkpoints = (fTestNet ? mapStakeModifierCheckpointsTestNet : mapStakeModifierCheckpoints); + + if (checkpoints.count(nHeight)) + return nStakeModifierChecksum == checkpoints[nHeight]; return true; }