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fix(pow): simplify testnet difficulty adjustment logic

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Move the special 20-minute rule check before LWMA calculation for clarity and maintain the same behavior. Remove redundant else block and consolidate the logic for returning last non-special-min-difficulty block.
This commit is contained in:
Davide Grilli
2025-11-14 10:35:02 +01:00
parent 922f94321e
commit 96eef06c25
1 changed files with 10 additions and 13 deletions
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23
src/pow.cpp
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@@ -19,6 +19,11 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
if ((pindexLast->nHeight >= 28930) && (pindexLast->nHeight <= 28999))
return nProofOfWorkLimit;
// Special difficulty rule for testnet: If the new block's timestamp is more than 20 minutes
// then allow mining of a min-difficulty block. This rule has priority over LWMA.
if (params.fPowAllowMinDifficultyBlocks && pblock->GetBlockTime() > pindexLast->GetBlockTime() + 20 * 60)
return nProofOfWorkLimit;
// For testnet, use LWMA from beginning to recalculate every block like mainnet
if (params.fPowAllowMinDifficultyBlocks && pindexLast->nHeight >= 0)
return LwmaCalculateNextWorkRequired(pindexLast, params);
@@ -31,19 +36,11 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
{
if (params.fPowAllowMinDifficultyBlocks)
{
// Special difficulty rule for testnet:
// If the new block's timestamp is more than 20 minutes
// then allow mining of a min-difficulty block.
if (pblock->GetBlockTime() > pindexLast->GetBlockTime() + 20 * 60)
return nProofOfWorkLimit;
else
{
// Return the last non-special-min-difficulty-rules-block
const CBlockIndex* pindex = pindexLast;
while (pindex->pprev && pindex->nHeight % params.DifficultyAdjustmentInterval() != 0 && pindex->nBits == nProofOfWorkLimit)
pindex = pindex->pprev;
return pindex->nBits;
}
// Return the last non-special-min-difficulty-rules-block
const CBlockIndex* pindex = pindexLast;
while (pindex->pprev && pindex->nHeight % params.DifficultyAdjustmentInterval() != 0 && pindex->nBits == nProofOfWorkLimit)
pindex = pindex->pprev;
return pindex->nBits;
}
return pindexLast->nBits;
}