// darksilk: attempt to generate suitable proof-of-stake
bool CBlock::SignBlock(CWallet& wallet, CAmount nFees)
{
// if we are trying to sign
// something except proof-of-stake block template
if (!vtx[0].vout[0].IsEmpty())
return false;
// if we are trying to sign
// a complete proof-of-stake block
if (IsProofOfStake())
return true;
static int64_t nLastCoinStakeSearchTime = GetAdjustedTime(); // startup timestamp
CKey key;
CTransaction txCoinStake;
txCoinStake.nTime &= ~STAKE_TIMESTAMP_MASK;
int64_t nSearchTime = txCoinStake.nTime; // search to current time
if (nSearchTime > nLastCoinStakeSearchTime)
{
int64_t nSearchInterval = 1;
if (wallet.CreateCoinStake(wallet, nBits, nSearchInterval, nFees, txCoinStake, key))
{
if (txCoinStake.nTime >= pindexBest->GetPastTimeLimit()+1)
{
// make sure coinstake would meet timestamp protocol
// as it would be the same as the block timestamp
vtx[0].nTime = nTime = txCoinStake.nTime;
// we have to make sure that we have no future timestamps in
// our transactions set
for (vector<CTransaction>::iterator it = vtx.begin(); it != vtx.end();)
if (it->nTime > nTime) { it = vtx.erase(it); } else { ++it; }
vtx.insert(vtx.begin() + 1, txCoinStake);
hashMerkleRoot = BuildMerkleTree();
// append a signature to our block
return key.Sign(GetHash(), vchBlockSig);
}
}
nLastCoinStakeSearchInterval = nSearchTime - nLastCoinStakeSearchTime;
nLastCoinStakeSearchTime = nSearchTime;
}
return false;
}
