#include "kernel.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<int, unsigned int> MapModifierCheckpoints;
( 37092, 0xd230afccu )
( 44200, 0x05370164u )
( 65000, 0xc8e7be6au )
+ ( 68600, 0x73a8cc4cu )
+ ( 92161, 0xe21a911au )
+ ( 98661, 0xd20c44d4u )
+ (143990, 0x9c592c78u )
;
// Hard checkpoints of stake modifiers to ensure they are deterministic (testNet)
( 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)
+int64_t GetWeight(int64_t nIntervalBeginning, int64_t nIntervalEnd)
{
// Kernel hash weight starts from 0 at the 30-day min age
// this change increases active coins participating the hash and helps
//
// Maximum TimeWeight is 90 days.
- return min(nIntervalEnd - nIntervalBeginning - nStakeMinAge, (int64)nStakeMaxAge);
+ return min(nIntervalEnd - nIntervalBeginning - nStakeMinAge, (int64_t)nStakeMaxAge);
}
// 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");
}
// 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;
// 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<pair<int64, uint256> >& vSortedByTimestamp, map<uint256, const CBlockIndex*>& mapSelectedBlocks,
- int64 nSelectionIntervalStop, uint64 nStakeModifierPrev, const CBlockIndex** pindexSelected)
+static bool SelectBlockFromCandidates(vector<pair<int64_t, uint256> >& vSortedByTimestamp, map<uint256, const CBlockIndex*>& 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());
// 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<pair<int64, uint256> > vSortedByTimestamp;
+ vector<pair<int64_t, uint256> > 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)
{
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<uint256, const CBlockIndex*> mapSelectedBlocks;
for (int nRound=0; nRound<min(64, (int)vSortedByTimestamp.size()); nRound++)
{
if (!SelectBlockFromCandidates(vSortedByTimestamp, mapSelectedBlocks, nSelectionIntervalStop, nStakeModifier, &pindex))
return error("ComputeNextStakeModifier: unable to select block at round %d", nRound);
// write the entropy bit of the selected block
- nStakeModifierNew |= (((uint64)pindex->GetStakeEntropyBit()) << 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"))
}
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;
// 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))
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)
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
// 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, uint256& targetProofOfStake, 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;
uint256 hashBlockFrom = blockFrom.GetHash();
- CBigNum bnCoinDayWeight = CBigNum(nValueIn) * GetWeight((int64)txPrev.nTime, (int64)nTimeTx) / COIN / (24 * 60 * 60);
+ CBigNum bnCoinDayWeight = CBigNum(nValueIn) * GetWeight((int64_t)txPrev.nTime, (int64_t)nTimeTx) / COIN / (24 * 60 * 60);
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(hashBlockFrom, nStakeModifier, nStakeModifierHeight, nStakeModifierTime, fPrintProofOfStake))
return false;
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[hashBlockFrom]->nHeight,
DateTimeStrFormat(blockFrom.GetBlockTime()).c_str());
- printf("CheckStakeKernelHash() : check modifier=0x%016"PRI64x" nTimeBlockFrom=%u nTxPrevOffset=%u nTimeTxPrev=%u nPrevout=%u nTimeTx=%u hashProof=%s\n",
+ printf("CheckStakeKernelHash() : check modifier=0x%016" PRIx64 " nTimeBlockFrom=%u nTxPrevOffset=%u nTimeTxPrev=%u nPrevout=%u nTimeTx=%u hashProof=%s\n",
nStakeModifier,
nTimeBlockFrom, nTxPrevOffset, txPrev.nTime, prevout.n, nTimeTx,
hashProofOfStake.ToString().c_str());
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[hashBlockFrom]->nHeight,
DateTimeStrFormat(blockFrom.GetBlockTime()).c_str());
- printf("CheckStakeKernelHash() : pass modifier=0x%016"PRI64x" nTimeBlockFrom=%u nTxPrevOffset=%u nTimeTxPrev=%u nPrevout=%u nTimeTx=%u hashProof=%s\n",
+ printf("CheckStakeKernelHash() : pass modifier=0x%016" PRIx64 " nTimeBlockFrom=%u nTxPrevOffset=%u nTimeTxPrev=%u nPrevout=%u nTimeTx=%u hashProof=%s\n",
nStakeModifier,
nTimeBlockFrom, nTxPrevOffset, txPrev.nTime, prevout.n, nTimeTx,
hashProofOfStake.ToString().c_str());
return true;
}
+// Scan given coins set for kernel solution
+bool ScanForStakeKernelHash(MetaMap &mapMeta, KernelSearchSettings &settings, CoinsSet::value_type &kernelcoin, uint32_t &nTimeTx, uint32_t &nBlockTime, uint64_t &nKernelsTried, uint64_t &nCoinDaysTried)
+{
+ uint256 hashProofOfStake = 0;
+
+ // (txid, vout.n) => ((txindex, (tx, vout.n)), (block, modifier))
+ for(MetaMap::const_iterator meta_item = mapMeta.begin(); meta_item != mapMeta.end(); meta_item++)
+ {
+ if (!fCoinsDataActual)
+ break;
+
+ CTxIndex txindex = (*meta_item).second.first.first;
+ CBlock block = (*meta_item).second.second.first;
+ uint64_t nStakeModifier = (*meta_item).second.second.second;
+
+ // Get coin
+ CoinsSet::value_type pcoin = meta_item->second.first.second;
+
+ static int nMaxStakeSearchInterval = 60;
+
+ // only count coins meeting min age requirement
+ if (nStakeMinAge + block.nTime > settings.nTime - nMaxStakeSearchInterval)
+ continue;
+
+ // Transaction offset inside block
+ uint32_t nTxOffset = txindex.pos.nTxPos - txindex.pos.nBlockPos;
+
+ // Current timestamp scanning interval
+ unsigned int nCurrentSearchInterval = min((int64_t)settings.nSearchInterval, (int64_t)nMaxStakeSearchInterval);
+
+ nBlockTime = block.nTime;
+ CBigNum bnTargetPerCoinDay;
+ bnTargetPerCoinDay.SetCompact(settings.nBits);
+ int64_t 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; n<nCurrentSearchInterval && fCoinsDataActual && !fShutdown; n++)
+ {
+ nTimeTx = settings.nTime - n;
+ CBigNum bnCoinDayWeight = CBigNum(nValueIn) * GetWeight((int64_t)pcoin.first->nTime, (int64_t)nTimeTx) / COIN / (24 * 60 * 60);
+ CBigNum bnTargetProofOfStake = bnCoinDayWeight * bnTargetPerCoinDay;
+
+ // 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());
+
+ // Update statistics
+ nKernelsTried += 1;
+ nCoinDaysTried += bnCoinDayWeight.getuint64();
+
+ if (bnTargetProofOfStake >= CBigNum(hashProofOfStake))
+ {
+ if (fDebug)
+ printf("nStakeModifier=0x%016" PRIx64 ", 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" PRIx64 ", 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)
{
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
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
}
// Check stake modifier hard checkpoints
-bool CheckStakeModifierCheckpoints(int nHeight, unsigned int nStakeModifierChecksum)
+bool CheckStakeModifierCheckpoints(int nHeight, uint32_t nStakeModifierChecksum)
{
MapModifierCheckpoints& checkpoints = (fTestNet ? mapStakeModifierCheckpointsTestNet : mapStakeModifierCheckpoints);
git://git.novaco.in / novacoin.git / blobdiff