bool CBlock::AcceptBlock()
{
AssertLockHeld(cs_main);
if (nVersion > CURRENT_VERSION)
return DoS(100, error("AcceptBlock() : reject unknown block version %d", nVersion));
// Check for duplicate
uint256 hash = GetHash();
if (mapBlockIndex.count(hash))
return error("AcceptBlock() : block already in mapBlockIndex");
// Get prev block index
map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashPrevBlock);
if (mi == mapBlockIndex.end())
return DoS(10, error("AcceptBlock() : prev block not found"));
CBlockIndex* pindexPrev = (*mi).second;
int nHeight = pindexPrev->nHeight+1;
if (IsProofOfStake() && nHeight < Params().FirstPOSBlock())
return DoS(100, error("AcceptBlock() : reject proof-of-stake at height <= %d", nHeight));
// Check coinbase timestamp
if (GetBlockTime() > FutureDrift((int64_t)vtx[0].nTime, IsProofOfStake()))
return DoS(50, error("AcceptBlock() : coinbase timestamp is too early"));
// Check coinstake timestamp
if (IsProofOfStake() && !CheckCoinStakeTimestamp(nHeight, GetBlockTime(), (int64_t)vtx[1].nTime))
return DoS(50, error("AcceptBlock() : coinstake timestamp violation nTimeBlock=%d nTimeTx=%u", GetBlockTime(), vtx[1].nTime));
// Check proof-of-work or proof-of-stake
if (nBits != GetNextTargetRequired(pindexPrev, IsProofOfStake()))
return DoS(100, error("AcceptBlock() : incorrect %s", IsProofOfWork() ? "proof-of-work" : "proof-of-stake"));
// Check timestamp against prev
LogPrintf("GetBlockTime(): %d, <=? pindexPrev->GetPastTimeLimit(): %d\nFutureDrift(GetBlockTime()): %d, <?pindexPrev->GetBlockTime(): %d\n",GetBlockTime(),pindexPrev->GetPastTimeLimit(),FutureDrift(GetBlockTime()),pindexPrev->GetBlockTime());
if (GetBlockTime() <= pindexPrev->GetPastTimeLimit() || FutureDrift(GetBlockTime(), IsProofOfStake()) < pindexPrev->GetBlockTime())
return error("AcceptBlock() : block's timestamp is too early");
// Check that all transactions are finalized
BOOST_FOREACH(const CTransaction& tx, vtx)
if (!IsFinalTx(tx, nHeight, GetBlockTime()))
return DoS(10, error("AcceptBlock() : contains a non-final transaction"));
// Check that the block chain matches the known block chain up to a checkpoint
if (!Checkpoints::CheckHardened(nHeight, hash))
return DoS(100, error("AcceptBlock() : rejected by hardened checkpoint lock-in at %d", nHeight));
uint256 hashProof;
// Verify hash target and signature of coinstake tx
if (IsProofOfStake())
{
uint256 targetProofOfStake;
if (!CheckProofOfStake(pindexPrev, vtx[1], nBits, hashProof, targetProofOfStake))
{
return error("AcceptBlock() : check proof-of-stake failed for block %s", hash.ToString());
}
}
// PoW is checked in CheckBlock()
if (IsProofOfWork())
{
hashProof = GetPoWHash();
}
// Check that the block satisfies synchronized checkpoint
if (!Checkpoints::CheckSync(nHeight))
return error("AcceptBlock() : rejected by synchronized checkpoint");
// Enforce rule that the coinbase starts with serialized block height
CScript expect = CScript() << nHeight;
if (vtx[0].vin[0].scriptSig.size() < expect.size() ||
!std::equal(expect.begin(), expect.end(), vtx[0].vin[0].scriptSig.begin()))
return DoS(100, error("AcceptBlock() : block height mismatch in coinbase"));
// Write block to history file
if (!CheckDiskSpace(::GetSerializeSize(*this, SER_DISK, CLIENT_VERSION)))
return error("AcceptBlock() : out of disk space");
unsigned int nFile = -1;
unsigned int nBlockPos = 0;
if (!WriteToDisk(nFile, nBlockPos))
return error("AcceptBlock() : WriteToDisk failed");
if (!AddToBlockIndex(nFile, nBlockPos, hashProof))
return error("AcceptBlock() : AddToBlockIndex failed");
// Relay inventory, but don't relay old inventory during initial block download
int nBlockEstimate = Checkpoints::GetTotalBlocksEstimate();
if (hashBestChain == hash)
{
LOCK(cs_vNodes);
BOOST_FOREACH(CNode* pnode, vNodes)
if (nBestHeight > (pnode->nStartingHeight != -1 ? pnode->nStartingHeight - 2000 : nBlockEstimate))
pnode->PushInventory(CInv(MSG_BLOCK, hash));
}
