using namespace std;
-// Modifier interval: time to elapse before new modifier is computed
-// Set to 6-hour for production network and 20-minute for test network
-unsigned int nModifierInterval = MODIFIER_INTERVAL;
+extern int nStakeMaxAge;
+extern int nStakeTargetSpacing;
+
+typedef std::map<int, unsigned int> MapModifierCheckpoints;
// Hard checkpoints of stake modifiers to ensure they are deterministic
static std::map<int, unsigned int> mapStakeModifierCheckpoints =
boost::assign::map_list_of
- ( 0, 0x0e00670bu )
- ( 6000, 0xb7cbc5d3u )
+ ( 0, 0x0e00670bu )
+ ( 9690, 0x97dcdafau )
+ ( 12661, 0x5d84115du )
+ ( 37092, 0xd230afccu )
+ ;
+
+// Hard checkpoints of stake modifiers to ensure they are deterministic (testNet)
+static std::map<int, unsigned int> mapStakeModifierCheckpointsTestNet =
+ boost::assign::map_list_of
+ ( 0, 0x0e00670bu )
;
// Get the last stake modifier and its generation time from a given block
// Sort candidate blocks by timestamp
vector<pair<int64, uint256> > vSortedByTimestamp;
- vSortedByTimestamp.reserve(64 * nModifierInterval / STAKE_TARGET_SPACING);
+ vSortedByTimestamp.reserve(64 * nModifierInterval / nStakeTargetSpacing);
int64 nSelectionInterval = GetStakeModifierSelectionInterval();
int64 nSelectionIntervalStart = (pindexPrev->GetBlockTime() / nModifierInterval) * nModifierInterval - nSelectionInterval;
const CBlockIndex* pindex = pindexPrev;
// 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(unsigned int nBits, const CBlock& blockFrom, unsigned int nTxPrevOffset, const CTransaction& txPrev, const COutPoint& prevout, unsigned int nTimeTx, uint256& hashProofOfStake, uint256& targetProofOfStake, bool fPrintProofOfStake)
{
if (nTimeTx < txPrev.nTime) // Transaction timestamp violation
return error("CheckStakeKernelHash() : nTime violation");
bnTargetPerCoinDay.SetCompact(nBits);
int64 nValueIn = txPrev.vout[prevout.n].nValue;
- // v0.3 protocol kernel hash weight starts from 0 at the 30-day min age
+ int64 nTimeWeight;
+ uint256 hashBlockFrom = blockFrom.GetHash();
+
+ // 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)STAKE_MAX_AGE) - nStakeMinAge;
+ //
+ if(fTestNet || (STAKEWEIGHT_SWITCH_TIME < nTimeTx))
+ {
+ // New rule since 01 Jan 2014: Maximum TimeWeight is 90 days.
+ nTimeWeight = min((int64)nTimeTx - txPrev.nTime - nStakeMinAge, (int64)nStakeMaxAge);
+ }
+ else
+ {
+ // Current rule: Maximum TimeWeight is 60 days.
+ nTimeWeight = min((int64)nTimeTx - txPrev.nTime, (int64)nStakeMaxAge) - nStakeMinAge;
+ }
+
CBigNum bnCoinDayWeight = CBigNum(nValueIn) * nTimeWeight / COIN / (24 * 60 * 60);
+ targetProofOfStake = (bnCoinDayWeight * bnTargetPerCoinDay).getuint256();
// Calculate hash
CDataStream ss(SER_GETHASH, 0);
int nStakeModifierHeight = 0;
int64 nStakeModifierTime = 0;
- if (!GetKernelStakeModifier(blockFrom.GetHash(), nStakeModifier, nStakeModifierHeight, nStakeModifierTime, fPrintProofOfStake))
+ if (!GetKernelStakeModifier(hashBlockFrom, nStakeModifier, nStakeModifierHeight, nStakeModifierTime, fPrintProofOfStake))
return false;
ss << nStakeModifier;
printf("CheckStakeKernelHash() : using modifier 0x%016"PRI64x" 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() : using modifier 0x%016"PRI64x" 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",
}
// 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());
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;
// Get stake modifier checksum
unsigned int GetStakeModifierChecksum(const CBlockIndex* pindex)
{
- assert (pindex->pprev || pindex->GetBlockHash() == hashGenesisBlock);
+ assert (pindex->pprev || pindex->GetBlockHash() == (!fTestNet ? hashGenesisBlock : hashGenesisBlockTestNet));
// Hash previous checksum with flags, hashProofOfStake and nStakeModifier
CDataStream ss(SER_GETHASH, 0);
if (pindex->pprev)
// Check stake modifier hard checkpoints
bool CheckStakeModifierCheckpoints(int nHeight, unsigned int 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;
}