if (!CheckBlock())
return false;
- // ppcoin: coin stake tx must meet target protocol
- if (IsProofOfStake() && !vtx[1].CheckProofOfStake(txdb, nBits))
- return error("ConnectBlock() : Block %s unable to meet hash target for coinstake", GetHash().ToString().c_str());
-
//// issue here: it doesn't know the version
unsigned int nTxPos = pindex->nBlockPos + ::GetSerializeSize(CBlock(), SER_DISK) - (2 * GetSizeOfCompactSize(0)) + GetSizeOfCompactSize(vtx.size());
// quantities so as to generate blocks faster, degrading the system back into
// a proof-of-work situation.
//
-bool CTransaction::CheckProofOfStake(CTxDB& txdb, unsigned int nBits) const
+bool CTransaction::CheckProofOfStake(unsigned int nBits) const
{
CBigNum bnTargetPerCoinDay;
bnTargetPerCoinDay.SetCompact(nBits);
const CTxIn& txin = vin[0];
// First try finding the previous transaction in database
+ CTxDB txdb("r");
CTransaction txPrev;
CTxIndex txindex;
if (!txPrev.ReadFromDisk(txdb, txin.prevout, txindex))
return false; // previous transaction not in main chain
+ txdb.Close();
if (nTime < txPrev.nTime)
return false; // Transaction timestamp violation
+ // Verify signature
+ if (!VerifySignature(txPrev, *this, 0))
+ return DoS(100, error("CheckProofOfStake() : VerifySignature failed on coinstake %s", GetHash().ToString().c_str()));
+
// Read block header
CBlock block;
if (!block.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, false))
if (CBigNum(Hash(ss.begin(), ss.end())) <= bnCoinDay * bnTargetPerCoinDay)
return true;
else
- return false;
+ return DoS(100, error("CheckProofOfStake() : check target failed on coinstake %s", GetHash().ToString().c_str()));
}
// ppcoin: total coin age spent in transaction, in the unit of coin-days.
if (nBits != GetNextTargetRequired(pindexPrev, IsProofOfStake()))
return DoS(100, error("AcceptBlock() : incorrect proof-of-work/proof-of-stake"));
+ // ppcoin: coinstake tx must meet target protocol
+ if (IsProofOfStake() && !vtx[1].CheckProofOfStake(nBits))
+ return error("AcceptBlock() : Block %s unable to meet hash target for coinstake", GetHash().ToString().c_str());
+
// Check timestamp against prev
if (GetBlockTime() <= pindexPrev->GetMedianTimePast() || GetBlockTime() + nMaxClockDrift < pindexPrev->GetBlockTime())
return error("AcceptBlock() : block's timestamp is too early");