int LitecoinChain::nextWorkRequired(BlockIterator blk) const {
const int64_t nTargetTimespan = 3.5 * 24 * 60 * 60; // two weeks
const int64_t nTargetSpacing = 2.5 * 60;
const int64_t nInterval = nTargetTimespan / nTargetSpacing;
// Genesis block
int h = blk.height();
if (h == 0) // trick to test that it is asking for the genesis block
return _genesisBlock.getBits(); // proofOfWorkLimit().GetCompact(); Actually not for the genesisblock - here it is 0x1e0ffff0, not 0x1e0fffff
// Only change once per interval
if ((h + 1) % nInterval != 0)
return blk->bits;
// 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
int blockstogoback = nInterval-1;
if ((h + 1) != nInterval)
blockstogoback = nInterval;
// Go back by what we want to be 3.5 days worth of blocks
BlockIterator former = blk - blockstogoback;
// Limit adjustment step
int nActualTimespan = blk->time - former->time;
log_debug(" nActualTimespan = %"PRI64d" before bounds", nActualTimespan);
if (nActualTimespan < nTargetTimespan/4)
nActualTimespan = nTargetTimespan/4;
if (nActualTimespan > nTargetTimespan*4)
nActualTimespan = nTargetTimespan*4;
// Retarget
CBigNum bnNew;
bnNew.SetCompact(blk->bits);
bnNew *= nActualTimespan;
bnNew /= nTargetTimespan;
if (bnNew > proofOfWorkLimit())
bnNew = proofOfWorkLimit();
/// debug print
log_info("GetNextWorkRequired RETARGET");
log_info("\tnTargetTimespan = %"PRI64d" nActualTimespan = %"PRI64d"", nTargetTimespan, nActualTimespan);
log_info("\tBefore: %08x %s", blk->bits, CBigNum().SetCompact(blk->bits).getuint256().toString().c_str());
log_info("\tAfter: %08x %s", bnNew.GetCompact(), bnNew.getuint256().toString().c_str());
return bnNew.GetCompact();
}
int TestNet3Chain::nextWorkRequired(BlockIterator blk) const {
const int64_t nTargetTimespan = 14 * 24 * 60 * 60; // two weeks
const int64_t nTargetSpacing = 10 * 60;
const int64_t nInterval = nTargetTimespan / nTargetSpacing;
// Genesis block
int h = blk.height();
if (h == 0) // trick to test that it is asking for the genesis block
return proofOfWorkLimit().GetCompact();
// Only change once per interval
if ((h + 1) % nInterval != 0) {
// Return the last non-special-min-difficulty-rules-block
while (blk.height() % nInterval != 0 && blk->bits == proofOfWorkLimit().GetCompact())
blk--;
return blk->bits;
}
// Go back by what we want to be 14 days worth of blocks
BlockIterator former = blk - (nInterval-1);
// Limit adjustment step
int nActualTimespan = blk->time - former->time;
log_debug(" nActualTimespan = %"PRI64d" before bounds", nActualTimespan);
if (nActualTimespan < nTargetTimespan/4)
nActualTimespan = nTargetTimespan/4;
if (nActualTimespan > nTargetTimespan*4)
nActualTimespan = nTargetTimespan*4;
// Retarget
CBigNum bnNew;
bnNew.SetCompact(blk->bits);
bnNew *= nActualTimespan;
bnNew /= nTargetTimespan;
if (bnNew > proofOfWorkLimit())
bnNew = proofOfWorkLimit();
/// debug print
log_info("GetNextWorkRequired RETARGET");
log_info("\tnTargetTimespan = %"PRI64d" nActualTimespan = %"PRI64d"", nTargetTimespan, nActualTimespan);
log_info("\tBefore: %08x %s", blk->bits, CBigNum().SetCompact(blk->bits).getuint256().toString().c_str());
log_info("\tAfter: %08x %s", bnNew.GetCompact(), bnNew.getuint256().toString().c_str());
return bnNew.GetCompact();
}
unsigned int BitcoinChain::nextWorkRequired(const CBlockIndex* pindexLast) const {
const int64 nTargetTimespan = 14 * 24 * 60 * 60; // two weeks
const int64 nTargetSpacing = 10 * 60;
const int64 nInterval = nTargetTimespan / nTargetSpacing;
// Genesis block
if (pindexLast == NULL)
return proofOfWorkLimit().GetCompact();
// Only change once per interval
if ((pindexLast->nHeight+1) % nInterval != 0)
return pindexLast->nBits;
// Go back by what we want to be 14 days worth of blocks
const CBlockIndex* pindexFirst = pindexLast;
for (int i = 0; pindexFirst && i < nInterval-1; i++)
pindexFirst = pindexFirst->pprev;
assert(pindexFirst);
// Limit adjustment step
int64 nActualTimespan = pindexLast->GetBlockTime() - pindexFirst->GetBlockTime();
printf(" nActualTimespan = %"PRI64d" before bounds\n", nActualTimespan);
if (nActualTimespan < nTargetTimespan/4)
nActualTimespan = nTargetTimespan/4;
if (nActualTimespan > nTargetTimespan*4)
nActualTimespan = nTargetTimespan*4;
// Retarget
CBigNum bnNew;
bnNew.SetCompact(pindexLast->nBits);
bnNew *= nActualTimespan;
bnNew /= nTargetTimespan;
if (bnNew > proofOfWorkLimit())
bnNew = proofOfWorkLimit();
/// debug print
printf("GetNextWorkRequired RETARGET\n");
printf("nTargetTimespan = %"PRI64d" nActualTimespan = %"PRI64d"\n", nTargetTimespan, nActualTimespan);
printf("Before: %08x %s\n", pindexLast->nBits, CBigNum().SetCompact(pindexLast->nBits).getuint256().toString().c_str());
printf("After: %08x %s\n", bnNew.GetCompact(), bnNew.getuint256().toString().c_str());
return bnNew.GetCompact();
}
int TerracoinChain::nextWorkRequired(BlockIterator blk) const {
const int64_t nTargetTimespan = 60 * 60; // one hour weeks
const int64_t nTargetSpacing = 2 * 60; // new block every two minutes
const int64_t nInterval = nTargetTimespan / nTargetSpacing;
// Genesis block
int h = blk.height();
if (h == 0) // trick to test that it is asking for the genesis block
return proofOfWorkLimit().GetCompact();
// Only change once per interval
if ((h + 1) % nInterval != 0)
return blk->bits;
// Go back by what we want to be 14 days worth of blocks
BlockIterator former = blk - (nInterval-1);
// Limit adjustment step
int nActualTimespan = blk->time - former->time;
log_debug(" nActualTimespan = %"PRI64d" before bounds", nActualTimespan);
if (nActualTimespan < nTargetTimespan/4)
nActualTimespan = nTargetTimespan/4;
if (nActualTimespan > nTargetTimespan*4)
nActualTimespan = nTargetTimespan*4;
// Retarget
CBigNum bnNew;
bnNew.SetCompact(blk->bits);
bnNew *= nActualTimespan;
bnNew /= nTargetTimespan;
if (bnNew > proofOfWorkLimit())
bnNew = proofOfWorkLimit();
/// debug print
log_info("GetNextWorkRequired RETARGET");
log_info("nTargetTimespan = %"PRI64d" nActualTimespan = %"PRI64d"", nTargetTimespan, nActualTimespan);
log_info("Before: %08x %s", blk->bits, CBigNum().SetCompact(blk->bits).getuint256().toString().c_str());
log_info("After: %08x %s", bnNew.GetCompact(), bnNew.getuint256().toString().c_str());
return bnNew.GetCompact();
}
bool CreateCoinStake( CBlock &blocknew, CKey &key,
vector<const CWalletTx*> &StakeInputs, uint64_t &CoinAge,
CWallet &wallet, CBlockIndex* pindexPrev )
{
int64_t CoinWeight;
CBigNum StakeKernelHash;
CTxDB txdb("r");
int64_t StakeWeightSum = 0;
double StakeValueSum = 0;
int64_t StakeWeightMin=MAX_MONEY;
int64_t StakeWeightMax=0;
uint64_t StakeCoinAgeSum=0;
double StakeDiffSum = 0;
double StakeDiffMax = 0;
CTransaction &txnew = blocknew.vtx[1]; // second tx is coinstake
//initialize the transaction
txnew.nTime = blocknew.nTime & (~STAKE_TIMESTAMP_MASK);
txnew.vin.clear();
txnew.vout.clear();
// Choose coins to use
set <pair <const CWalletTx*,unsigned int> > CoinsToStake;
int64_t BalanceToStake = wallet.GetBalance();
int64_t nValueIn = 0;
//Request all the coins here, check reserve later
if ( BalanceToStake<=0
|| !wallet.SelectCoinsForStaking(BalanceToStake*2, txnew.nTime, CoinsToStake, nValueIn) )
{
LOCK(MinerStatus.lock);
MinerStatus.ReasonNotStaking+=_("No coins; ");
if (fDebug) LogPrintf("CreateCoinStake: %s",MinerStatus.ReasonNotStaking);
return false;
}
BalanceToStake -= nReserveBalance;
if(fDebug2) LogPrintf("\nCreateCoinStake: Staking nTime/16= %d Bits= %u",
txnew.nTime/16,blocknew.nBits);
for(const auto& pcoin : CoinsToStake)
{
const CTransaction &CoinTx =*pcoin.first; //transaction that produced this coin
unsigned int CoinTxN =pcoin.second; //index of this coin inside it
CTxIndex txindex;
{
LOCK2(cs_main, wallet.cs_wallet);
if (!txdb.ReadTxIndex(pcoin.first->GetHash(), txindex))
continue; //error?
}
CBlock CoinBlock; //Block which contains CoinTx
{
LOCK2(cs_main, wallet.cs_wallet);
if (!CoinBlock.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, false))
continue;
}
// only count coins meeting min age requirement
if (CoinBlock.GetBlockTime() + nStakeMinAge > txnew.nTime)
continue;
if (CoinTx.vout[CoinTxN].nValue > BalanceToStake)
continue;
{
int64_t nStakeValue= CoinTx.vout[CoinTxN].nValue;
StakeValueSum += nStakeValue /(double)COIN;
//crazy formula...
// todo: clean this
// todo reuse calculated value for interst
CBigNum bn = CBigNum(nStakeValue) * (blocknew.nTime-CoinTx.nTime) / CENT;
bn = bn * CENT / COIN / (24 * 60 * 60);
StakeCoinAgeSum += bn.getuint64();
}
if(blocknew.nVersion==7)
{
NetworkTimer();
CoinWeight = CalculateStakeWeightV3(CoinTx,CoinTxN,GlobalCPUMiningCPID);
StakeKernelHash= CalculateStakeHashV3(CoinBlock,CoinTx,CoinTxN,txnew.nTime,GlobalCPUMiningCPID,mdPORNonce);
}
else
{
uint64_t StakeModifier = 0;
if(!FindStakeModifierRev(StakeModifier,pindexPrev))
continue;
CoinWeight = CalculateStakeWeightV8(CoinTx,CoinTxN,GlobalCPUMiningCPID);
StakeKernelHash= CalculateStakeHashV8(CoinBlock,CoinTx,CoinTxN,txnew.nTime,StakeModifier,GlobalCPUMiningCPID);
}
CBigNum StakeTarget;
StakeTarget.SetCompact(blocknew.nBits);
StakeTarget*=CoinWeight;
StakeWeightSum += CoinWeight;
StakeWeightMin=std::min(StakeWeightMin,CoinWeight);
StakeWeightMax=std::max(StakeWeightMax,CoinWeight);
double StakeKernelDiff = GetBlockDifficulty(StakeKernelHash.GetCompact())*CoinWeight;
StakeDiffSum += StakeKernelDiff;
StakeDiffMax = std::max(StakeDiffMax,StakeKernelDiff);
if (fDebug2) {
int64_t RSA_WEIGHT = GetRSAWeightByBlock(GlobalCPUMiningCPID);
LogPrintf(
"CreateCoinStake: V%d Time %.f, Por_Nonce %.f, Bits %jd, Weight %jd\n"
" RSA_WEIGHT %.f\n"
" Stk %72s\n"
" Trg %72s\n"
" Diff %0.7f of %0.7f\n",
blocknew.nVersion,
(double)txnew.nTime, mdPORNonce,
(intmax_t)blocknew.nBits,(intmax_t)CoinWeight,
(double)RSA_WEIGHT,
StakeKernelHash.GetHex().c_str(), StakeTarget.GetHex().c_str(),
StakeKernelDiff, GetBlockDifficulty(blocknew.nBits)
);
}
if( StakeKernelHash <= StakeTarget )
{
// Found a kernel
LogPrintf("\nCreateCoinStake: Found Kernel;\n");
blocknew.nNonce= mdPORNonce;
vector<valtype> vSolutions;
txnouttype whichType;
CScript scriptPubKeyOut;
CScript scriptPubKeyKernel;
scriptPubKeyKernel = CoinTx.vout[CoinTxN].scriptPubKey;
if (!Solver(scriptPubKeyKernel, whichType, vSolutions))
{
LogPrintf("CreateCoinStake: failed to parse kernel\n");
break;
}
if (whichType == TX_PUBKEYHASH) // pay to address type
{
// convert to pay to public key type
if (!wallet.GetKey(uint160(vSolutions[0]), key))
{
LogPrintf("CreateCoinStake: failed to get key for kernel type=%d\n", whichType);
break; // unable to find corresponding public key
}
scriptPubKeyOut << key.GetPubKey() << OP_CHECKSIG;
}
else if (whichType == TX_PUBKEY) // pay to public key type
{
valtype& vchPubKey = vSolutions[0];
if (!wallet.GetKey(Hash160(vchPubKey), key)
|| key.GetPubKey() != vchPubKey)
{
LogPrintf("CreateCoinStake: failed to get key for kernel type=%d\n", whichType);
break; // unable to find corresponding public key
}
scriptPubKeyOut = scriptPubKeyKernel;
}
else
{
LogPrintf("CreateCoinStake: no support for kernel type=%d\n", whichType);
break; // only support pay to public key and pay to address
}
txnew.vin.push_back(CTxIn(CoinTx.GetHash(), CoinTxN));
StakeInputs.push_back(pcoin.first);
if (!txnew.GetCoinAge(txdb, CoinAge))
return error("CreateCoinStake: failed to calculate coin age");
int64_t nCredit = CoinTx.vout[CoinTxN].nValue;
txnew.vout.push_back(CTxOut(0, CScript())); // First Must be empty
txnew.vout.push_back(CTxOut(nCredit, scriptPubKeyOut));
//txnew.vout.push_back(CTxOut(0, scriptPubKeyOut));
LogPrintf("CreateCoinStake: added kernel type=%d credit=%f\n", whichType,CoinToDouble(nCredit));
LOCK(MinerStatus.lock);
MinerStatus.KernelsFound++;
MinerStatus.KernelDiffMax = 0;
MinerStatus.KernelDiffSum = StakeDiffSum;
return true;
}
}
LOCK(MinerStatus.lock);
MinerStatus.WeightSum = StakeWeightSum;
MinerStatus.ValueSum = StakeValueSum;
MinerStatus.WeightMin=StakeWeightMin;
MinerStatus.WeightMax=StakeWeightMax;
MinerStatus.CoinAgeSum=StakeCoinAgeSum;
MinerStatus.KernelDiffMax = std::max(MinerStatus.KernelDiffMax,StakeDiffMax);
MinerStatus.KernelDiffSum = StakeDiffSum;
MinerStatus.nLastCoinStakeSearchInterval= txnew.nTime;
return false;
}
unsigned int RetargetGPU(const CBlockIndex* pindex, bool output)
{
/** Get the Last Block Index [1st block back in Channel]. **/
const CBlockIndex* pindexFirst = GetLastChannelIndex(pindex, 2);
if (pindexFirst->pprev == NULL)
return bnProofOfWorkStart[2].GetCompact();
/** Get Last Block Index [2nd block back in Channel]. **/
const CBlockIndex* pindexLast = GetLastChannelIndex(pindexFirst->pprev, 2);
if (pindexLast->pprev == NULL)
return bnProofOfWorkStart[2].GetCompact();
/** Get the Block Times with Minimum of 1 to Prevent Time Warps. **/
int64 nBlockTime = ((pindex->nVersion >= 4) ? GetWeightedTimes(pindexFirst, 5) : max(pindexFirst->GetBlockTime() - pindexLast->GetBlockTime(), (int64) 1));
int64 nBlockTarget = nTargetTimespan;
/** Get the Chain Modular from Reserves. **/
double nChainMod = GetFractionalSubsidy(GetChainAge(pindexFirst->GetBlockTime()), 0, ((pindex->nVersion >= 3) ? 40.0 : 20.0)) / (pindexFirst->nReleasedReserve[0] + 1);
nChainMod = min(nChainMod, 1.0);
nChainMod = max(nChainMod, (pindex->nVersion == 1) ? 0.75 : 0.5);
/** Enforce Block Version 2 Rule. Chain mod changes block time requirements, not actual mod after block times. **/
if(pindex->nVersion >= 2)
nBlockTarget *= nChainMod;
/** The Upper and Lower Bound Adjusters. **/
int64 nUpperBound = nBlockTarget;
int64 nLowerBound = nBlockTarget;
/** Handle for Version 3 Blocks. Mod determined by time multiplied by max / min. **/
if(pindex->nVersion >= 3)
{
/** If the time is above target, reduce difficulty by modular
of one interval past timespan multiplied by maximum decrease. **/
if(nBlockTime >= nBlockTarget)
{
/** Take the Minimum overlap of Target Timespan to make that maximum interval. **/
uint64 nOverlap = (uint64)min((nBlockTime - nBlockTarget), (nBlockTarget * 2));
/** Get the Mod from the Proportion of Overlap in one Interval. **/
double nProportions = (double)nOverlap / (nBlockTarget * 2);
/** Get Mod from Maximum Decrease Equation with Decimal portions multiplied by Propotions. **/
double nMod = 1.0 - (((pindex->nVersion >= 4) ? 0.15 : 0.75) * nProportions);
nLowerBound = nBlockTarget * nMod;
}
/** If the time is below target, increase difficulty by modular
of interval of 1 - Block Target with time of 1 being maximum increase **/
else
{
/** Get the overlap in reference from Target Timespan. **/
uint64 nOverlap = nBlockTarget - nBlockTime;
/** Get the mod from overlap proportion. Time of 1 will be closest to mod of 1. **/
double nProportions = (double) nOverlap / nBlockTarget;
/** Get the Mod from the Maximum Increase Equation with Decimal portion multiplied by Proportions. **/
double nMod = 1.0 + (nProportions * 0.075);
nLowerBound = nBlockTarget * nMod;
}
}
/** Handle for Version 2 Difficulty Adjustments. **/
else
{
double nBlockMod = (double) nBlockTarget / nBlockTime;
nBlockMod = min(nBlockMod, 1.125);
nBlockMod = max(nBlockMod, 0.75);
/** Calculate the Lower Bounds. **/
nLowerBound = nBlockTarget * nBlockMod;
/** Version 1 Blocks Change Lower Bound from Chain Modular. **/
if(pindex->nVersion == 1)
nLowerBound *= nChainMod;
/** Set Maximum [difficulty] up to 8%, and Minimum [difficulty] down to 50% **/
nLowerBound = min(nLowerBound, (int64)(nUpperBound + (nUpperBound / 8)));
nLowerBound = max(nLowerBound, (3 * nUpperBound ) / 4);
}
/** Get the Difficulty Stored in Bignum Compact. **/
CBigNum bnNew;
bnNew.SetCompact(pindexFirst->nBits);
/** Change Number from Upper and Lower Bounds. **/
bnNew *= nUpperBound;
bnNew /= nLowerBound;
/** Don't allow Difficulty to decrease below minimum. **/
if (bnNew > bnProofOfWorkLimit[2])
bnNew = bnProofOfWorkLimit[2];
/** Console Output if Flagged. **/
if(output)
{
int64 nDays, nHours, nMinutes;
GetChainTimes(GetChainAge(pindexFirst->GetBlockTime()), nDays, nHours, nMinutes);
printf("RETARGET[GPU] weighted time=%"PRId64" actual time %"PRId64" [%f %%]\n\tchain time: [%"PRId64" / %"PRId64"]\n\treleased reward: %"PRId64" [%f %%]\n\tdifficulty: [%f to %f]\n\tGPU height: %"PRId64" [AGE %"PRId64" days, %"PRId64" hours, %"PRId64" minutes]\n\n",
nBlockTime, max(pindexFirst->GetBlockTime() - pindexLast->GetBlockTime(), (int64) 1), (100.0 * nLowerBound) / nUpperBound, nBlockTarget, nBlockTime, pindexFirst->nReleasedReserve[0] / COIN, 100.0 * nChainMod, GetDifficulty(pindexFirst->nBits, 2), GetDifficulty(bnNew.GetCompact(), 2), pindexFirst->nChannelHeight, nDays, nHours, nMinutes);
}
return bnNew.GetCompact();
}
/** Proof of Stake Retargeting: Modulate Difficulty based on production rate. **/
unsigned int RetargetPOS(const CBlockIndex* pindex, bool output)
{
/** Get Last Block Index [1st block back in Channel]. **/
const CBlockIndex* pindexFirst = GetLastChannelIndex(pindex, 0);
if (pindexFirst->pprev == NULL)
return bnProofOfWorkStart[0].GetCompact();
/** Get Last Block Index [2nd block back in Channel]. **/
const CBlockIndex* pindexLast = GetLastChannelIndex(pindexFirst->pprev, 0);
if (pindexLast->pprev == NULL)
return bnProofOfWorkStart[0].GetCompact();
/** Get the Block Time and Target Spacing. **/
int64 nBlockTime = GetWeightedTimes(pindexFirst, 5);
int64 nBlockTarget = STAKE_TARGET_SPACING;
/** The Upper and Lower Bound Adjusters. **/
int64 nUpperBound = nBlockTarget;
int64 nLowerBound = nBlockTarget;
/** If the time is above target, reduce difficulty by modular
of one interval past timespan multiplied by maximum decrease. **/
if(nBlockTime >= nBlockTarget)
{
/** Take the Minimum overlap of Target Timespan to make that maximum interval. **/
uint64 nOverlap = (uint64)min((nBlockTime - nBlockTarget), (nBlockTarget * 2));
/** Get the Mod from the Proportion of Overlap in one Interval. **/
double nProportions = (double)nOverlap / (nBlockTarget * 2);
/** Get Mod from Maximum Decrease Equation with Decimal portions multiplied by Propotions. **/
double nMod = 1.0 - (0.15 * nProportions);
nLowerBound = nBlockTarget * nMod;
}
/** If the time is below target, increase difficulty by modular
of interval of 1 - Block Target with time of 1 being maximum increase **/
else
{
/** Get the overlap in reference from Target Timespan. **/
uint64 nOverlap = nBlockTarget - nBlockTime;
/** Get the mod from overlap proportion. Time of 1 will be closest to mod of 1. **/
double nProportions = (double) nOverlap / nBlockTarget;
/** Get the Mod from the Maximum Increase Equation with Decimal portion multiplied by Proportions. **/
double nMod = 1.0 + (nProportions * 0.075);
nLowerBound = nBlockTarget * nMod;
}
/** Get the Difficulty Stored in Bignum Compact. **/
CBigNum bnNew;
bnNew.SetCompact(pindexFirst->nBits);
/** Change Number from Upper and Lower Bounds. **/
bnNew *= nUpperBound;
bnNew /= nLowerBound;
/** Don't allow Difficulty to decrease below minimum. **/
if (bnNew > bnProofOfWorkLimit[0])
bnNew = bnProofOfWorkLimit[0];
if(output)
{
int64 nDays, nHours, nMinutes;
GetChainTimes(GetChainAge(pindexFirst->GetBlockTime()), nDays, nHours, nMinutes);
printf("CHECK[POS] weighted time=%"PRId64" actual time =%"PRId64"[%f %%]\n\tchain time: [%"PRId64" / %"PRId64"]\n\tdifficulty: [%f to %f]\n\tPOS height: %"PRId64" [AGE %"PRId64" days, %"PRId64" hours, %"PRId64" minutes]\n\n",
nBlockTime, max(pindexFirst->GetBlockTime() - pindexLast->GetBlockTime(), (int64) 1), ((100.0 * nLowerBound) / nUpperBound), nBlockTarget, nBlockTime, GetDifficulty(pindexFirst->nBits, 0), GetDifficulty(bnNew.GetCompact(), 0), pindexFirst->nChannelHeight, nDays, nHours, nMinutes);
}
return bnNew.GetCompact();
}