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Be more conservative: check all transactions in blocks after last checkpoint.

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This commit is contained in:
Gavin Andresen 2011-12-23 17:13:10 -05:00
parent 5ad2ca011e
commit fe358165e3
1 changed files with 4 additions and 5 deletions
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9
src/main.cpp
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@ -35,7 +35,6 @@ map<COutPoint, CInPoint> mapNextTx;
map<uint256, CBlockIndex*> mapBlockIndex;
uint256 hashGenesisBlock("0x000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f");
static CBigNum bnProofOfWorkLimit(~uint256(0) >> 32);
const int nInitialBlockThreshold = 120; // Regard blocks up until N-threshold as "initial download"
CBlockIndex* pindexGenesisBlock = NULL;
int nBestHeight = -1;
CBigNum bnBestChainWork = 0;
@ -826,7 +825,7 @@ int GetNumBlocksOfPeers()
bool IsInitialBlockDownload()
{
if (pindexBest == NULL || nBestHeight < (Checkpoints::GetTotalBlocksEstimate()-nInitialBlockThreshold))
if (pindexBest == NULL || nBestHeight < Checkpoints::GetTotalBlocksEstimate())
return true;
static int64 nLastUpdate;
static CBlockIndex* pindexLastBest;
@ -976,10 +975,10 @@ bool CTransaction::ConnectInputs(map<uint256, pair<CTxIndex, CTransaction> > inp
if (pindex->nBlockPos == txindex.pos.nBlockPos && pindex->nFile == txindex.pos.nFile)
return error("ConnectInputs() : tried to spend coinbase at depth %d", pindexBlock->nHeight - pindex->nHeight);
// Skip ECDSA signature verification when connecting blocks (fBlock=true) during initial download
// (before the last blockchain checkpoint). This is safe because block merkle hashes are
// Skip ECDSA signature verification when connecting blocks (fBlock=true)
// before the last blockchain checkpoint. This is safe because block merkle hashes are
// still computed and checked, and any change will be caught at the next checkpoint.
if (!(fBlock && IsInitialBlockDownload()))
if (!(fBlock && (nBestHeight < Checkpoints::GetTotalBlocksEstimate())))
{
bool fStrictOpEval = true;
// This code should be removed when OP_EVAL has