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Add parentChainPowLimit, check in CheckBitcoinProof

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instagibbs 2016-06-09 13:23:11 -04:00 • committed by Gregory Sanders
parent e30340a8d6
commit c87debb048
3 changed files with 9 additions and 1 deletions
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7
src/chainparams.cpp
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@ -61,6 +61,12 @@ public:
consensus.BIP65Height = 388381; // 000000000000000004c2b624ed5d7756c508d90fd0da2c7c679febfa6c4735f0
consensus.BIP66Height = 363725; // 00000000000000000379eaa19dce8c9b722d46ae6a57c2f1a988119488b50931
consensus.powLimit = uint256S("00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
// Peg-ins Bitcoin headers must have higher difficulty target than this field
// This value must be sufficiently small to not preclude realistic parent
// chain difficulty during network lifespan yet sufficiently large to
// deny peg-in DoS attacks due to our inability to ban after failed
// IsBitcoinBlock RPC checks.
consensus.parentChainPowLimit = uint256S("00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
consensus.nPowTargetTimespan = 14 * 24 * 60 * 60; // two weeks
consensus.nPowTargetSpacing = 10 * 60;
consensus.fPowAllowMinDifficultyBlocks = false;
@ -166,6 +172,7 @@ public:
consensus.BIP65Height = 1351; // BIP65 activated on regtest (Used in rpc activation tests)
consensus.BIP66Height = 1251; // BIP66 activated on regtest (Used in rpc activation tests)
consensus.powLimit = uint256S("7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
consensus.parentChainPowLimit = uint256S("7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
consensus.nPowTargetTimespan = 14 * 24 * 60 * 60; // two weeks
consensus.nPowTargetSpacing = 10 * 60;
consensus.fPowAllowMinDifficultyBlocks = true;

1
src/consensus/params.h
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@ -56,6 +56,7 @@ struct Params {
BIP9Deployment vDeployments[MAX_VERSION_BITS_DEPLOYMENTS];
/** Proof of work parameters */
uint256 powLimit;
uint256 parentChainPowLimit;
bool fPowAllowMinDifficultyBlocks;
bool fPowNoRetargeting;
int64_t nPowTargetSpacing;

2
src/pow.cpp
View file

@ -46,7 +46,7 @@ bool CheckBitcoinProof(uint256 hash, unsigned int nBits)
bnTarget.SetCompact(nBits, &fNegative, &fOverflow);
// Check range
if (fNegative || bnTarget == 0 || fOverflow || bnTarget > UintToArith256(Params().GetConsensus().powLimit))
if (fNegative || bnTarget == 0 || fOverflow || bnTarget > UintToArith256(Params().GetConsensus().parentChainPowLimit))
return false;
// Check proof of work matches claimed amount