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Use equivalent PoW for non-main-chain requests

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This commit is contained in:
Pieter Wuille
2015-03-17 06:35:59 -07:00
parent b6ea3bcede
commit f7303f9793
4 changed files with 49 additions and 4 deletions
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17
src/pow.cpp
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@ -114,3 +114,20 @@ arith_uint256 GetBlockProof(const CBlockIndex& block)
// or ~bnTarget / (nTarget+1) + 1.
return (~bnTarget / (bnTarget + 1)) + 1;
}
int64_t GetBlockProofEquivalentTime(const CBlockIndex& to, const CBlockIndex& from, const CBlockIndex& tip, const Consensus::Params& params)
{
arith_uint256 r;
int sign = 1;
if (to.nChainWork > from.nChainWork) {
r = to.nChainWork - from.nChainWork;
} else {
r = from.nChainWork - to.nChainWork;
sign = -1;
}
r = r * arith_uint256(params.nPowTargetSpacing) / GetBlockProof(tip);
if (r.bits() > 63) {
return sign * std::numeric_limits<int64_t>::max();
}
return sign * r.GetLow64();
}