static bool CheckNBits(unsigned int nbits1, int64 time1, unsigned int nbits2, int64 time2)\
{
if (time1 > time2)
return CheckNBits(nbits2, time2, nbits1, time1);
int64 deltaTime = time2-time1;
CBigNum required;
required.SetCompact(ComputeMinWork(nbits1, deltaTime));
CBigNum have;
have.SetCompact(nbits2);
return (have <= required);
}
void SimulateNextBlock(CBlockIndex*& tip, double* hashRates)
{
double recTime = 1e9;
CBlockIndex* newTip = new CBlockIndex;
newTip->pprev = tip;
newTip->nHeight = tip->nHeight+1;
for (int i=0; i<NUM_ALGOS; i++)
{
if (hashRates[i] == 0) continue;
CBigNum target;
unsigned int nBits = GetNextWorkRequired(tip, NULL, i);
target.SetCompact(nBits);
double dtarget = target.getuint256().getdouble()/pow(2,256);
double mean = 1/(hashRates[i]*dtarget);
boost::exponential_distribution<double> distr(1/mean);
double received = distr(prng);
if (received < recTime)
{
recTime = received;
newTip->nVersion = VersionForAlgo(i);
newTip->nTime = tip->nTime + received;
newTip->nBits=nBits;
}
}
assert(recTime < 1e9);
tip = newTip;
return;
}
double BitsToDifficulty(int nBits)
{
CBigNum target;
target.SetCompact(nBits);
// approximate
return pow(2, 256-32)/target.getuint256().getdouble();
}
unsigned int static GravityWell(const CBlockIndex* pindexLast, const CBlockHeader *pblock, uint64_t TargetBlocksSpacingSeconds, uint64_t PastBlocksMin, uint64_t PastBlocksMax) {
const CBlockIndex *BlockLastSolved = pindexLast;
const CBlockIndex *BlockReading = pindexLast;
uint64_t PastBlocksMass = 0;
int64_t PastRateActualSeconds = 0;
int64_t PastRateTargetSeconds = 0;
double PastRateAdjustmentRatio = double(1);
CBigNum PastDifficultyAverage;
CBigNum PastDifficultyAveragePrev;
double EventHorizonDeviation;
double EventHorizonDeviationFast;
double EventHorizonDeviationSlow;
CBigNum bnLimit = CBigNum(~uint256(0) >> 20);
if (BlockLastSolved == NULL || BlockLastSolved->nHeight == 0 || (uint64_t)BlockLastSolved->nHeight < PastBlocksMin) { return bnLimit.GetCompact(); }
for (unsigned int i = 1; BlockReading && BlockReading->nHeight > 0; i++) {
if (PastBlocksMax > 0 && i > PastBlocksMax) { break; }
PastBlocksMass++;
if (i == 1) { PastDifficultyAverage.SetCompact(BlockReading->nBits); }
else { PastDifficultyAverage = ((CBigNum().SetCompact(BlockReading->nBits) - PastDifficultyAveragePrev) / i) + PastDifficultyAveragePrev; }
PastDifficultyAveragePrev = PastDifficultyAverage;
PastRateActualSeconds = BlockLastSolved->GetBlockTime() - BlockReading->GetBlockTime();
PastRateTargetSeconds = TargetBlocksSpacingSeconds * PastBlocksMass;
PastRateAdjustmentRatio = double(1);
if (PastRateActualSeconds < 0) { PastRateActualSeconds = 0; }
if (PastRateActualSeconds != 0 && PastRateTargetSeconds != 0) {
PastRateAdjustmentRatio = double(PastRateTargetSeconds) / double(PastRateActualSeconds);
}
EventHorizonDeviation = 1 + (0.7084 * pow((double(PastBlocksMass)/double(144)), -1.228));
EventHorizonDeviationFast = EventHorizonDeviation;
EventHorizonDeviationSlow = 1 / EventHorizonDeviation;
if (PastBlocksMass >= PastBlocksMin) {
if ((PastRateAdjustmentRatio <= EventHorizonDeviationSlow) || (PastRateAdjustmentRatio >= EventHorizonDeviationFast)) { assert(BlockReading); break; }
}
if (BlockReading->pprev == NULL) { assert(BlockReading); break; }
BlockReading = BlockReading->pprev;
}
CBigNum bnNew(PastDifficultyAverage);
if (PastRateActualSeconds != 0 && PastRateTargetSeconds != 0) {
bnNew *= PastRateActualSeconds;
bnNew /= PastRateTargetSeconds;
}
if (bnNew > bnLimit) { bnNew = bnLimit; }
/// debug print
LogPrintf("Difficulty Retarget - Gravity Well\n");
LogPrintf("PastRateAdjustmentRatio = %g\n", PastRateAdjustmentRatio);
LogPrintf("Before: %08x %s\n", pindexLast->nBits, CBigNum().SetCompact(pindexLast->nBits).getuint256().ToString());
LogPrintf("After: %08x %s\n", bnNew.GetCompact(), bnNew.getuint256().ToString());
return bnNew.GetCompact();
}
CBigNum CBlockIndex::GetBlockWork() const
{
CBigNum bnTarget;
bnTarget.SetCompact(nBits);
if (bnTarget <= 0)
return 0;
return (CBigNum(1)<<256) / (bnTarget+1);
}
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();
}
/// This function has changed as it served two purposes: sanity check for headers and real proof of work check. We only need the proofOfWorkLimit for the latter
const bool TerracoinChain::checkProofOfWork(const Block& block) const {
uint256 hash = block.getHash();
unsigned int nBits = block.getBits();
CBigNum bnTarget;
bnTarget.SetCompact(nBits);
// Check range
if (proofOfWorkLimit() != 0 && (bnTarget <= 0 || bnTarget > proofOfWorkLimit())) {
log_error("CheckProofOfWork() : nBits below minimum work");
return false;
}
// Check proof of work matches claimed amount
if (hash > bnTarget.getuint256()) {
log_error("CheckProofOfWork() : hash doesn't match nBits");
return false;
}
return true;
}
void MiningPage::timerEvent(QTimerEvent *)
{
int64 NetworkHashrate = GetNetworkHashPS(120, -1).get_int64();
int64 Hashrate = GetBoolArg("-gen")? gethashespersec(json_spirit::Array(), false).get_int64() : 0;
QString NextBlockTime;
if (Hashrate == 0)
NextBlockTime = QChar(L'∞');
else
{
CBigNum Target;
Target.SetCompact(pindexBest->nBits);
CBigNum ExpectedTime = (CBigNum(1) << 256)/(Target*Hashrate);
NextBlockTime = formatTimeInterval(ExpectedTime);
}
ui->labelNethashrate->setText(formatHashrate(NetworkHashrate));
ui->labelYourHashrate->setText(formatHashrate(Hashrate));
ui->labelNextBlock->setText(NextBlockTime);
}
/// This function has changed as it served two purposes: sanity check for headers and real proof of work check. We only need the proofOfWorkLimit for the latter
/// For namecoin we allow merged mining for the PoW!
const bool NamecoinChain::checkProofOfWork(const Block& block) const {
log_trace("Enter %s (block.version = %d)", __FUNCTION__, block.getVersion());
// we accept aux pow all the time - the lockins will ensure we get the right chain
// Prevent same work from being submitted twice:
// - this block must have our chain ID
// - parent block must not have the same chain ID (see CAuxPow::Check)
// - index of this chain in chain merkle tree must be pre-determined (see CAuxPow::Check)
// if (nHeight != INT_MAX && GetChainID() != GetOurChainID())
// return error("CheckProofOfWork() : block does not have our chain ID");
CBigNum target;
target.SetCompact(block.getBits());
if (proofOfWorkLimit() != 0 && (target <= 0 || target > proofOfWorkLimit())) {
cout << target.GetHex() << endl;
cout << proofOfWorkLimit().GetHex() << endl;
log_error("CheckProofOfWork() : nBits below minimum work");
return false;
}
if (block.getVersion()&BLOCK_VERSION_AUXPOW) {
if (!block.getAuxPoW().Check(block.getHash(), block.getVersion()/BLOCK_VERSION_CHAIN_START)) {
log_error("CheckProofOfWork() : AUX POW is not valid");
return false;
}
// Check proof of work matches claimed amount
if (block.getAuxPoW().GetParentBlockHash() > target.getuint256()) {
log_error("CheckProofOfWork() : AUX proof of work failed");
return false;
}
}
else {
// Check proof of work matches claimed amount
if (block.getHash() > target.getuint256()) {
log_error("CheckProofOfWork() : proof of work failed");
return false;
}
}
log_trace("Return(true): %s", __FUNCTION__);
return true;
}
/** Main Connection Thread. Handles all the networking to allow
Mining threads the most performance. **/
void ServerConnection::ServerThread()
{
/** Don't begin until all mining threads are Created. **/
while (THREADS.size() != nThreads)
Sleep(1000);
/** Initialize the Server Connection. **/
CLIENT = new LLP::Miner(IP, PORT);
/** Initialize a Timer for the Hash Meter. **/
TIMER.Start();
unsigned int nTimerWait = 2;
unsigned int nBestHeight = 0;
loop
{
try
{
/** Run this thread at 1 Cycle per Second. **/
Sleep(50);
/** Attempt with best efforts to keep the Connection Alive. **/
if (!CLIENT->Connected() || CLIENT->Errors())
{
ResetThreads();
if (!CLIENT->Connect())
continue;
else
CLIENT->SetChannel(2);
}
/** Check the Block Height. **/
unsigned int nHeight = CLIENT->GetHeight(5);
if (nHeight == 0)
{
printf("[MASTER] Failed to Update Height\n");
CLIENT->Disconnect();
continue;
}
/** If there is a new block, Flag the Threads to Stop Mining. **/
if (nHeight != nBestHeight)
{
nBestHeight = nHeight;
printf("[MASTER] Coinshield Network: New Block %u\n", nHeight);
ResetThreads();
}
/** Rudimentary Meter **/
if (TIMER.Elapsed() > nTimerWait)
{
double Elapsed = (double)TIMER.ElapsedMilliseconds();
unsigned long long nHashes = Hashes();
//double khash = ((double)nHashes)/Elapsed;
unsigned long long khash = nHashes / TIMER.ElapsedMilliseconds();
unsigned int nDifficulty = THREADS[0]->GetBlock()->GetBits();
nDifficulty = nDifficulty & 0xffffff;
CBigNum target;
target.SetCompact(nDifficulty);
//double diff = (double)(0xFFFF * pow(2, 208)) / (double)nDifficulty;
printf("[METERS] %llu kHash/s | Height = %u | Diff= %.08f\n", khash, nBestHeight, 1.0 / (double)nDifficulty);
TIMER.Reset();
if (nTimerWait == 2)
nTimerWait = 20;
}
/** Check if there is work to do for each Miner Thread. **/
for (unsigned int nIndex = 0; nIndex < THREADS.size(); nIndex++)
{
/** Attempt to get a new block from the Server if Thread needs One. **/
if (THREADS[nIndex]->GetIsNewBlock())
{
/** Retrieve new block from Server. **/
/** Delete the Block Pointer if it Exists. **/
CBlock* pBlock = THREADS[nIndex]->GetBlock();
if (pBlock != NULL)
{
delete(pBlock);
}
/** Retrieve new block from Server. **/
pBlock = CLIENT->GetBlock(5);
/** If the block is good, tell the Mining Thread its okay to Mine. **/
if (pBlock)
{
THREADS[nIndex]->SetIsBlockFound(false);
THREADS[nIndex]->SetIsNewBlock(false);
THREADS[nIndex]->SetBlock(pBlock);
THREADS[nIndex]->SetHashes(0); // reset hash count
}
/** If the Block didn't come in properly, Reconnect to the Server. **/
else
{
CLIENT->Disconnect();
break;
}
}
/** Submit a block from Mining Thread if Flagged. **/
else if (THREADS[nIndex]->GetIsBlockFound())
{
//
/** Attempt to Submit the Block to Network. **/
unsigned char RESPONSE = CLIENT->SubmitBlock(THREADS[nIndex]->GetBlock()->GetMerkleRoot(), THREADS[nIndex]->GetBlock()->GetNonce(), 10);
double Elapsed = (double)TIMER.ElapsedMilliseconds();
double nHashes = THREADS[nIndex]->GetHashes();
double khash = nHashes / Elapsed;
Hashes();
TIMER.Reset();
if (RESPONSE == 200)
printf("[MASTER] Block Found by %s on thread %d %.1f kHash/s (accepted) Yay !!!\n", device_name[nIndex], nIndex, khash);
else if (RESPONSE == 201)
{
printf("[MASTER] Block Found by %s on thread %d %.1f kHash/s (rejected) Booo !!!\n", device_name[nIndex], nIndex, khash);
THREADS[nIndex]->SetIsNewBlock(true);
THREADS[nIndex]->SetIsBlockFound(false);
}
else
{
printf("[MASTER] Failure to Submit Block. Reconnecting...\n");
CLIENT->Disconnect();
}
break;
}
}
}
catch (std::exception& e)
{
printf("%s\n", e.what());
}
}
};
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();
}
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;
}
CMainParams() {
// The message start string is designed to be unlikely to occur in normal data.
// The characters are rarely used upper ASCII, not valid as UTF-8, and produce
// a large 4-byte int at any alignment.
pchMessageStart[0] = 0xf9;
pchMessageStart[1] = 0xbe;
pchMessageStart[2] = 0xb4;
pchMessageStart[3] = 0xd9;
vAlertPubKey = ParseHex("04fc9702847840aaf195de8442ebecedf5b095cdbb9bc716bda9110971b28a49e0ead8564ff0db22209e0374782c093bb899692d524e9d6a6956e7c5ecbcd68284");
nDefaultPort = 28333;
nRPCPort = 8332;
bnProofOfWorkLimit = CBigNum(~uint256(0) >> 16);
nSubsidyHalvingInterval = 210000;
// Build the genesis block. Note that the output of the genesis coinbase cannot
// be spent as it did not originally exist in the database.
//
// CBlock(hash=000000000019d6, ver=1, hashPrevBlock=00000000000000, hashMerkleRoot=4a5e1e, nTime=1231006505, nBits=1d00ffff, nNonce=2083236893, vtx=1)
// CTransaction(hash=4a5e1e, ver=1, vin.size=1, vout.size=1, nLockTime=0)
// CTxIn(COutPoint(000000, -1), coinbase 04ffff001d0104455468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73)
// CTxOut(nValue=50.00000000, scriptPubKey=0x5F1DF16B2B704C8A578D0B)
// vMerkleTree: 4a5e1e
const char* pszTimestamp = "2014-03-30 Nobody 50.06, Kiska 29.66, Fico 20.28; Founder: heXKRhnGdSg";
int extranonce = 42;
CTransaction txNew;
txNew.vin.resize(1);
txNew.vout.resize(1);
txNew.vin[0].scriptSig = CScript() << extranonce << CBigNum(4) << vector<unsigned char>((const unsigned char*)pszTimestamp, (const unsigned char*)pszTimestamp + strlen(pszTimestamp));
txNew.vout[0].nValue = 50 * COIN;
txNew.vout[0].scriptPubKey = CScript() << ParseHex("2dc4f1967fbf825c77dadd9da14c3608428ada53") << OP_EQUALVERIFY << OP_CHECKSIG;
genesis.vtx.push_back(txNew);
genesis.hashPrevBlock = 0;
genesis.hashMerkleRoot = genesis.BuildMerkleTree();
genesis.nVersion = 1;
genesis.nTime = 1396187239;
genesis.nBits = 0x1e008fff;
genesis.nNonce = 23443383;
hashGenesisBlock = genesis.GetHash();
#ifdef MINE_GENESIS
CBigNum bnTarget;
bnTarget.SetCompact(genesis.nBits);
fprintf(stderr, "Target: %s\n", bnTarget.ToString().c_str());
assert(!(bnTarget <= 0 || bnTarget > Params().ProofOfWorkLimit()));
while(hashGenesisBlock > bnTarget.getuint256()) {
++genesis.nNonce;
if(!genesis.nNonce) {
++extranonce;
};
hashGenesisBlock = genesis.GetHash();
}
fprintf(stderr, "Nonce = %d\nExtranonce = %d\n", genesis.nNonce, extranonce);
fprintf(stderr, "Genesis hash = %s\nMerkle root = %s\n", hashGenesisBlock.GetHex().c_str(), genesis.hashMerkleRoot.GetHex().c_str());
#else
assert(hashGenesisBlock == uint256("0x000000530b4b2d75534bfa61c42e62f4402ce579dd8507c70009e69439f4bd19"));
assert(genesis.hashMerkleRoot == uint256("0x2446d19ab3361d3484c4f1dade799a54dfd010f193521659a26341c6f50b811a"));
#endif
vSeeds.push_back(CDNSSeedData("bitcoin.sipa.be", "seed.bitcoin.sipa.be"));
vSeeds.push_back(CDNSSeedData("bluematt.me", "dnsseed.bluematt.me"));
vSeeds.push_back(CDNSSeedData("dashjr.org", "dnsseed.bitcoin.dashjr.org"));
vSeeds.push_back(CDNSSeedData("bitcoinstats.com", "seed.bitcoinstats.com"));
vSeeds.push_back(CDNSSeedData("xf2.org", "bitseed.xf2.org"));
base58Prefixes[PUBKEY_ADDRESS] = list_of(45);
base58Prefixes[SCRIPT_ADDRESS] = list_of(50);
base58Prefixes[SECRET_KEY] = list_of(173);
base58Prefixes[EXT_PUBLIC_KEY] = list_of(0x04)(0x88)(0xB2)(0x1E);
base58Prefixes[EXT_SECRET_KEY] = list_of(0x04)(0x88)(0xAD)(0xE4);
// Convert the pnSeeds array into usable address objects.
for (unsigned int i = 0; i < ARRAYLEN(pnSeed); i++)
{
// It'll only connect to one or two seed nodes because once it connects,
// it'll get a pile of addresses with newer timestamps.
// Seed nodes are given a random 'last seen time' of between one and two
// weeks ago.
const int64_t nOneWeek = 7*24*60*60;
struct in_addr ip;
memcpy(&ip, &pnSeed[i], sizeof(ip));
CAddress addr(CService(ip, GetDefaultPort()));
addr.nTime = GetTime() - GetRand(nOneWeek) - nOneWeek;
vFixedSeeds.push_back(addr);
}
}
void MinerThread::SK1024Miner()
{
SetThreadPriority(GetCurrentThread(), 2);
const int throughput = GetThroughput() == 0 ? 512 * 1 * 512 * 8 : GetThroughput();
loop
{
try
{
/** Don't mine if the Connection Thread is Submitting Block or Receiving New. **/
while(m_bNewBlock || m_bBlockFound || !m_pBLOCK)
Sleep(1);
CBigNum target;
target.SetCompact(m_pBLOCK->GetBits());
if (m_bBenchmark == true)
{
target.SetCompact(0x7e006fff);
//target.SetCompact(0x7e7fffff);
//target.SetCompact(0x7e7fffff);
//target = target / 0x300;
}
while(!m_bNewBlock)
{
uint1024 hash;
unsigned long long hashes=0;
unsigned int * TheData =(unsigned int*) m_pBLOCK->GetData();
uint1024 TheTarget = target.getuint1024();
uint64_t Nonce; //= m_pBLOCK->GetNonce();
bool found = false;
m_clLock.lock();
{
Nonce = m_pBLOCK->GetNonce();
//m_GpuId = 0;
found = scanhash_sk1024(m_GpuId, TheData, TheTarget, Nonce, 512 * 8 * 512 * 40, &hashes, throughput, 128, 128);
if (hashes < 0xffffffffffff)
SetHashes(GetHashes()+hashes);
}
m_clLock.unlock();
if(found)
{
m_bBlockFound = true;
m_clLock.lock();
{
m_pBLOCK->SetNonce(Nonce);
}
m_clLock.unlock();
break;
}
// printf("hashes %d m_unHashes %d gethashes %d\n",hashes,m_unHashes,GetHashes());
/*m_clLock.lock();
{
m_pBLOCK->SetNonce(m_pBLOCK->GetNonce()+hashes);
}
m_clLock.unlock();
*/
if(Nonce >= MAX_THREADS) //max_thread==> max_nonce
{
m_bNewBlock = true;
break;
}
}
}
catch(std::exception& e)
{
printf("ERROR: %s\n", e.what());
}
}
}
/** 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();
}
