static std::map<int, unsigned int> mapStakeModifierCheckpoints =
boost::assign::map_list_of
( 0, 0x0e00670bu )
- ( 9690, 0x97dcdafau )
( 12661, 0x5d84115du )
- ( 37092, 0xd230afccu )
- ( 44200, 0x05370164u )
- ( 65000, 0xc8e7be6au )
- ( 68600, 0x73a8cc4cu )
- ( 92161, 0xe21a911au )
- ( 98661, 0xd20c44d4u )
(143990, 0x9c592c78u )
+ (149000, 0x48f2bdc4u )
+ (160000, 0x789df0f0u )
;
// Hard checkpoints of stake modifiers to ensure they are deterministic (testNet)
}
// 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)
+bool ScanForStakeKernelHash(MetaMap &mapMeta, uint32_t nBits, uint32_t nTime, uint32_t nSearchInterval, CoinsSet::value_type &kernelcoin, uint32_t &nTimeTx, uint32_t &nBlockTime, uint64_t &nKernelsTried, uint64_t &nCoinDaysTried)
{
uint256 hashProofOfStake = 0;
// Get coin
CoinsSet::value_type pcoin = meta_item->second.first.second;
- static int nMaxStakeSearchInterval = 60;
+ static unsigned int nMaxStakeSearchInterval = 60;
// only count coins meeting min age requirement
- if (nStakeMinAge + block.nTime > settings.nTime - nMaxStakeSearchInterval)
+ if (nStakeMinAge + block.nTime > 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);
+ unsigned int nCurrentSearchInterval = min(nSearchInterval, nMaxStakeSearchInterval);
nBlockTime = block.nTime;
CBigNum bnTargetPerCoinDay;
- bnTargetPerCoinDay.SetCompact(settings.nBits);
+ bnTargetPerCoinDay.SetCompact(nBits);
int64_t nValueIn = pcoin.first->vout[pcoin.second].nValue;
- // Search backward in time from the given timestamp
+ // 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;
+ nTimeTx = nTime - n;
CBigNum bnCoinDayWeight = CBigNum(nValueIn) * GetWeight((int64_t)pcoin.first->nTime, (int64_t)nTimeTx) / COIN / (24 * 60 * 60);
CBigNum bnTargetProofOfStake = bnCoinDayWeight * bnTargetPerCoinDay;
return false;
}
+// Scan given input for kernel solution
+bool ScanInputForStakeKernelHash(CTransaction &tx, uint32_t nOut, uint32_t nBits, uint32_t nSearchInterval, std::pair<uint256, uint32_t> &solution)
+{
+ CTxDB txdb("r");
+
+ CBlock block;
+ CTxIndex txindex;
+
+ // Load transaction index item
+ if (!txdb.ReadTxIndex(tx.GetHash(), txindex))
+ return false;
+
+ // Read block header
+ if (!block.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, false))
+ return false;
+
+ uint64_t nStakeModifier = 0;
+ if (!GetKernelStakeModifier(block.GetHash(), nStakeModifier))
+ return false;
+
+ uint32_t nTime = GetTime();
+ // Only count coins meeting min age requirement
+ if (nStakeMinAge + block.nTime > nTime)
+ nTime += (nStakeMinAge + block.nTime - nTime);
+
+ // Transaction offset inside block
+ uint32_t nTxOffset = txindex.pos.nTxPos - txindex.pos.nBlockPos;
+ int64_t nValueIn = tx.vout[nOut].nValue;
+
+ CBigNum bnTargetPerCoinDay;
+ bnTargetPerCoinDay.SetCompact(nBits);
+
+ // Get maximum possible target to filter out the majority of obviously insufficient hashes
+ CBigNum bnMaxTargetPerCoinDay = bnTargetPerCoinDay * CBigNum(nValueIn) * nStakeMaxAge / COIN / (24 * 60 * 60);
+ uint256 maxTarget = bnMaxTargetPerCoinDay.getuint256();
+
+ // Search forward in time from the given timestamp
+ // Stopping search in case of shutting down
+ for (unsigned int n=0; n<nSearchInterval && !fShutdown; n++)
+ {
+ uint32_t nTimeTx = nTime + n;
+
+ // Build kernel
+ CDataStream ss(SER_GETHASH, 0);
+ ss << nStakeModifier;
+ ss << block.nTime << nTxOffset << tx.nTime << nOut << nTimeTx;
+
+ // Calculate kernel hash
+ uint256 hashProofOfStake = Hash(ss.begin(), ss.end());
+
+ // Skip if hash doesn't satisfy the maximum target
+ if (hashProofOfStake > maxTarget)
+ continue;
+
+ CBigNum bnCoinDayWeight = CBigNum(nValueIn) * GetWeight((int64_t)tx.nTime, (int64_t)nTimeTx) / COIN / (24 * 60 * 60);
+ CBigNum bnTargetProofOfStake = bnCoinDayWeight * bnTargetPerCoinDay;
+
+ if (bnTargetProofOfStake >= CBigNum(hashProofOfStake))
+ {
+ solution.first = hashProofOfStake;
+ solution.second = nTimeTx;
+
+ return true;
+ }
+ }
+
+ return false;
+}
+
// Check kernel hash target and coinstake signature
bool CheckProofOfStake(const CTransaction& tx, unsigned int nBits, uint256& hashProofOfStake, uint256& targetProofOfStake)
{