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Digishield difficulty adjustment.

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Changed block time to 2 minutes.
This commit is contained in:
Jianping Wu 2018-10-09 11:29:40 -07:00
parent b3a0506e4c
commit 30e907bac6
2 changed files with 44 additions and 30 deletions
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8
src/chainparams.cpp
View File

@ -83,8 +83,8 @@ public:
consensus.BIP65Height = 918684; // bab3041e8977e0dc3eeff63fe707b92bde1dd449d8efafb248c27c8264cc311a
consensus.BIP66Height = 811879; // 7aceee012833fa8952f8835d8b1b3ae233cd6ab08fdb27a771d2bd7bdc491894
consensus.powLimit = uint256S("000fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
consensus.nPowTargetTimespan = 3.5 * 24 * 60 * 60; // 3.5 days
consensus.nPowTargetSpacing = 2.5 * 60;
consensus.nPowTargetTimespan = 2.0 * 60; // Two minutes
consensus.nPowTargetSpacing = 2.0 * 60; // Two minutes
consensus.fPowAllowMinDifficultyBlocks = false;
consensus.fPowNoRetargeting = false;
consensus.nRuleChangeActivationThreshold = 6048; // 75% of 8064
@ -132,8 +132,8 @@ public:
printf("recalculating params for mainnet.\n");
printf("old mainnet genesis nonce: %d\n", genesis.nNonce);
printf("old mainnet genesis hash: %s\n", hashGenesisBlock.ToString().c_str());
// deliberately empty for loop finds nonce value.
for(genesis.nNonce = 1000; hashTarget < UintToArith256(genesis.GetPoWHash()); genesis.nNonce++) {
// deliberately empty for loop finds nonce value.
for(genesis.nNonce = 1000; hashTarget < UintToArith256(genesis.GetPoWHash()); genesis.nNonce++) {
printf("JWU nNonce: %d\n\n", genesis.nNonce);
}
printf("new mainnet genesis merkle root: %s\n", genesis.hashMerkleRoot.ToString().c_str());

66
src/pow.cpp
View File

@ -1,5 +1,6 @@
// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2017 The Bitcoin Core developers
// Copyright (c) 2009-2014 The Bitcoin Core developers
// Copyright (c) 2014-2015 The Dogecoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
@ -11,33 +12,45 @@
#include <uint256.h>
#include <util.h>
// Copy and modified from CalculateDogecoinNextWorkRequired (dogecoin.cpp)
unsigned int CalculateDigishieldNextWorkRequired(const CBlockIndex* pindexLast, int64_t nFirstBlockTime, const Consensus::Params& params)
{
const int64_t retargetTimespan = params.nPowTargetTimespan;
const int64_t nActualTimespan = pindexLast->GetBlockTime() - nFirstBlockTime;
int64_t nModulatedTimespan = nActualTimespan;
int64_t nMaxTimespan;
int64_t nMinTimespan;
// amplitude filter - thanks to daft27 for this code
nModulatedTimespan = retargetTimespan + (nModulatedTimespan - retargetTimespan) / 8;
nMinTimespan = retargetTimespan - (retargetTimespan / 4);
nMaxTimespan = retargetTimespan + (retargetTimespan / 2);
// Limit adjustment step
if (nModulatedTimespan < nMinTimespan)
nModulatedTimespan = nMinTimespan;
else if (nModulatedTimespan > nMaxTimespan)
nModulatedTimespan = nMaxTimespan;
// Retarget
const arith_uint256 bnPowLimit = UintToArith256(params.powLimit);
arith_uint256 bnNew;
arith_uint256 bnOld;
bnNew.SetCompact(pindexLast->nBits);
bnOld = bnNew;
bnNew *= nModulatedTimespan;
bnNew /= retargetTimespan;
if (bnNew > bnPowLimit)
bnNew = bnPowLimit;
return bnNew.GetCompact();
}
unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock, const Consensus::Params& params)
{
assert(pindexLast != nullptr);
unsigned int nProofOfWorkLimit = UintToArith256(params.powLimit).GetCompact();
// Only change once per difficulty adjustment interval
if ((pindexLast->nHeight+1) % params.DifficultyAdjustmentInterval() != 0)
{
if (params.fPowAllowMinDifficultyBlocks)
{
// Special difficulty rule for testnet:
// If the new block's timestamp is more than 2* 10 minutes
// then allow mining of a min-difficulty block.
if (pblock->GetBlockTime() > pindexLast->GetBlockTime() + params.nPowTargetSpacing*2)
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 pindexLast->nBits;
}
// Go back by what we want to be 14 days worth of blocks
// Litecoin: This fixes an issue where a 51% attack can change difficulty at will.
// Go back the full period unless it's the first retarget after genesis. Code courtesy of Art Forz
@ -52,7 +65,8 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
assert(pindexFirst);
return CalculateNextWorkRequired(pindexLast, pindexFirst->GetBlockTime(), params);
//return CalculateNextWorkRequired(pindexLast, pindexFirst->GetBlockTime(), params);
return CalculateDigishieldNextWorkRequired(pindexLast, pindexFirst->GetBlockTime(), params);
}
unsigned int CalculateNextWorkRequired(const CBlockIndex* pindexLast, int64_t nFirstBlockTime, const Consensus::Params& params)