Adjust from average difficulty instead of previous difficulty
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b181f7032b
commit
29842505cc
26
src/pow.cpp
26
src/pow.cpp
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@ -43,7 +43,15 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
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// Find the first block in the averaging interval
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const CBlockIndex* pindexFirst = pindexLast;
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arith_uint256 bnAvg;
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arith_uint256 bnTmp;
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for (int i = 0; pindexFirst && i < params.nPowAveragingWindow; i++) {
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if (i == 0) {
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bnAvg.SetCompact(pindexFirst->nBits);
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} else {
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bnTmp.SetCompact(pindexFirst->nBits);
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bnAvg = ((bnAvg * i) + bnTmp) / (i + 1);
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}
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pindexFirst = pindexFirst->pprev;
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}
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@ -51,15 +59,20 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
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if (pindexFirst == NULL)
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return nProofOfWorkLimit;
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return CalculateNextWorkRequired(pindexBits->nBits, pindexLast->GetMedianTimePast(), pindexFirst->GetMedianTimePast(), params);
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return CalculateNextWorkRequired(bnAvg, pindexLast->GetMedianTimePast(), pindexFirst->GetMedianTimePast(), params);
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}
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// Left for testing purposes
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unsigned int CalculateNextWorkRequired(const CBlockIndex* pindexLast, int64_t nFirstBlockTime, const Consensus::Params& params)
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{
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return CalculateNextWorkRequired(pindexLast->nBits, pindexLast->GetMedianTimePast(), nFirstBlockTime, params);
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arith_uint256 bnAvg;
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bnAvg.SetCompact(pindexLast->nBits);
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return CalculateNextWorkRequired(bnAvg, pindexLast->GetMedianTimePast(), nFirstBlockTime, params);
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}
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unsigned int CalculateNextWorkRequired(uint32_t nBits, int64_t nLastBlockTime, int64_t nFirstBlockTime, const Consensus::Params& params)
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unsigned int CalculateNextWorkRequired(arith_uint256 bnAvg,
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int64_t nLastBlockTime, int64_t nFirstBlockTime,
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const Consensus::Params& params)
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{
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// Limit adjustment step
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// Use medians to prevent time-warp attacks
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@ -75,10 +88,7 @@ unsigned int CalculateNextWorkRequired(uint32_t nBits, int64_t nLastBlockTime, i
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// Retarget
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const arith_uint256 bnPowLimit = UintToArith256(params.powLimit);
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arith_uint256 bnNew;
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arith_uint256 bnOld;
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bnNew.SetCompact(nBits);
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bnOld = bnNew;
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arith_uint256 bnNew {bnAvg};
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bnNew /= params.AveragingWindowTimespan();
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bnNew *= nActualTimespan;
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@ -88,7 +98,7 @@ unsigned int CalculateNextWorkRequired(uint32_t nBits, int64_t nLastBlockTime, i
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/// debug print
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LogPrint("pow", "GetNextWorkRequired RETARGET\n");
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LogPrint("pow", "params.AveragingWindowTimespan() = %d nActualTimespan = %d\n", params.AveragingWindowTimespan(), nActualTimespan);
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LogPrint("pow", "Before: %08x %s\n", nBits, bnOld.ToString());
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LogPrint("pow", "Current average: %08x %s\n", bnAvg.GetCompact(), bnAvg.ToString());
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LogPrint("pow", "After: %08x %s\n", bnNew.GetCompact(), bnNew.ToString());
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return bnNew.GetCompact();
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@ -18,7 +18,9 @@ class arith_uint256;
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unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock, const Consensus::Params&);
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unsigned int CalculateNextWorkRequired(const CBlockIndex* pindexLast, int64_t nFirstBlockTime, const Consensus::Params&);
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unsigned int CalculateNextWorkRequired(uint32_t nBits, int64_t nLastBlockTime, int64_t nFirstBlockTime, const Consensus::Params&);
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unsigned int CalculateNextWorkRequired(arith_uint256 bnAvg,
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int64_t nLastBlockTime, int64_t nFirstBlockTime,
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const Consensus::Params&);
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/** Check whether the Equihash solution in a block header is valid */
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bool CheckEquihashSolution(const CBlockHeader *pblock, const CChainParams&);
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