}
// ppcoin: create coin stake transaction
-bool CWallet::CreateCoinStake(unsigned int nBits, CTransaction& txNew)
+bool CWallet::CreateCoinStake(const CKeyStore& keystore, unsigned int nBits, int64 nSearchInterval, CTransaction& txNew)
{
+ // The following split & combine thresholds are important to security
+ // Should not be adjusted if you don't understand the consequences
+ static unsigned int nStakeSplitAge = (60 * 60 * 24 * 90);
+ int64 nCombineThreshold = GetProofOfWorkReward(GetLastBlockIndex(pindexBest, false)->nBits) / 3;
+
CBigNum bnTargetPerCoinDay;
bnTargetPerCoinDay.SetCompact(nBits);
if (setCoins.empty())
return false;
int64 nCredit = 0;
+ CScript scriptPubKeyKernel;
BOOST_FOREACH(PAIRTYPE(const CWalletTx*, unsigned int) pcoin, setCoins)
{
CTxDB txdb("r");
CBlock block;
if (!block.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, false))
continue;
- if (block.GetBlockTime() + STAKE_MIN_AGE > txNew.nTime)
+ if (block.GetBlockTime() + nStakeMinAge > txNew.nTime)
continue; // only count coins meeting min age requirement
int64 nValueIn = pcoin.first->vout[pcoin.second].nValue;
- CBigNum bnCoinDay = CBigNum(nValueIn) * (txNew.nTime-pcoin.first->nTime) / COIN / (24 * 60 * 60);
- // Calculate hash
- CDataStream ss(SER_GETHASH, 0);
- ss << nBits << block.nTime << (txindex.pos.nTxPos - txindex.pos.nBlockPos) << pcoin.first->nTime << pcoin.second << txNew.nTime;
- if (CBigNum(Hash(ss.begin(), ss.end())) <= bnCoinDay * bnTargetPerCoinDay)
+ CBigNum bnCoinDay = CBigNum(nValueIn) * min(txNew.nTime-pcoin.first->nTime, (unsigned int)STAKE_MAX_AGE) / COIN / (24 * 60 * 60);
+
+ bool fKernelFound = false;
+ for (int n=0; n<min(nSearchInterval,(int64)5) && !fKernelFound && !fShutdown; n++)
{
- txNew.vin.push_back(CTxIn(pcoin.first->GetHash(), pcoin.second));
- nCredit += pcoin.first->vout[pcoin.second].nValue;
- vwtxPrev.push_back(pcoin.first);
- // Set output scriptPubKey
- txNew.vout.push_back(CTxOut(0, pcoin.first->vout[pcoin.second].scriptPubKey));
- break;
+ // Randomly pick a timestamp from protocol allowed range
+ txNew.nTime = GetAdjustedTime() - GetRandInt(60 * 60 * 2 - 60);
+ // Calculate hash
+ CDataStream ss(SER_GETHASH, 0);
+ ss << nBits << block.nTime << (txindex.pos.nTxPos - txindex.pos.nBlockPos) << pcoin.first->nTime << pcoin.second << txNew.nTime;
+ if (CBigNum(Hash(ss.begin(), ss.end())) <= bnCoinDay * bnTargetPerCoinDay)
+ {
+ // Found a kernel
+ if (fDebug && GetBoolArg("-printcoinstake"))
+ printf("CreateCoinStake : kernel found\n");
+ vector<valtype> vSolutions;
+ txnouttype whichType;
+ CScript scriptPubKeyOut;
+ scriptPubKeyKernel = pcoin.first->vout[pcoin.second].scriptPubKey;
+ if (!Solver(scriptPubKeyKernel, whichType, vSolutions))
+ {
+ if (fDebug && GetBoolArg("-printcoinstake"))
+ printf("CreateCoinStake : failed to parse kernel\n", whichType);
+ break;
+ }
+ if (fDebug && GetBoolArg("-printcoinstake"))
+ printf("CreateCoinStake : parsed kernel type=%d\n", whichType);
+ if (whichType != TX_PUBKEY && whichType != TX_PUBKEYHASH)
+ {
+ if (fDebug && GetBoolArg("-printcoinstake"))
+ printf("CreateCoinStake : no support for kernel type=%d\n", whichType);
+ break; // only support pay to public key and pay to address
+ }
+ if (whichType == TX_PUBKEYHASH) // pay to address type
+ {
+ // convert to pay to public key type
+ CKey key;
+ if (!keystore.GetKey(uint160(vSolutions[0]), key))
+ {
+ if (fDebug && GetBoolArg("-printcoinstake"))
+ printf("CreateCoinStake : failed to get key for kernel type=%d\n", whichType);
+ break; // unable to find corresponding public key
+ }
+ scriptPubKeyOut << key.GetPubKey() << OP_CHECKSIG;
+ }
+ else
+ scriptPubKeyOut = scriptPubKeyKernel;
+
+ txNew.vin.push_back(CTxIn(pcoin.first->GetHash(), pcoin.second));
+ nCredit += pcoin.first->vout[pcoin.second].nValue;
+ vwtxPrev.push_back(pcoin.first);
+ txNew.vout.push_back(CTxOut(0, scriptPubKeyOut));
+ if (block.GetBlockTime() + nStakeSplitAge > txNew.nTime)
+ txNew.vout.push_back(CTxOut(0, scriptPubKeyOut)); //split stake
+ if (fDebug && GetBoolArg("-printcoinstake"))
+ printf("CreateCoinStake : added kernel type=%d\n", whichType);
+ fKernelFound = true;
+ }
}
+ if (fKernelFound || fShutdown)
+ break; // if kernel is found stop searching
}
if (nCredit == 0 || nCredit > nBalance - nReserveBalance)
return false;
BOOST_FOREACH(PAIRTYPE(const CWalletTx*, unsigned int) pcoin, setCoins)
{
- // Attempt to add more inputs of the same key
- if (pcoin.first->vout[pcoin.second].scriptPubKey == txNew.vout[1].scriptPubKey && pcoin.first->GetHash() != txNew.vin[0].prevout.hash)
+ // Attempt to add more inputs
+ // Only add coins of the same key/address as kernel
+ if (txNew.vout.size() == 2 && ((pcoin.first->vout[pcoin.second].scriptPubKey == scriptPubKeyKernel || pcoin.first->vout[pcoin.second].scriptPubKey == txNew.vout[1].scriptPubKey))
+ && pcoin.first->GetHash() != txNew.vin[0].prevout.hash)
{
// Stop adding more inputs if value is already pretty significant
- if (nCredit > MAX_MINT_PROOF_OF_WORK)
+ if (nCredit > nCombineThreshold)
break;
// Stop adding inputs if reached reserve limit
if (nCredit + pcoin.first->vout[pcoin.second].nValue > nBalance - nReserveBalance)
break;
// Do not add additional significant input
- if (pcoin.first->vout[pcoin.second].nValue > MAX_MINT_PROOF_OF_WORK)
+ if (pcoin.first->vout[pcoin.second].nValue > nCombineThreshold)
continue;
txNew.vin.push_back(CTxIn(pcoin.first->GetHash(), pcoin.second));
nCredit += pcoin.first->vout[pcoin.second].nValue;
loop
{
// Set output amount
- txNew.vout[1].nValue = nCredit - nMinFee;
+ if (txNew.vout.size() == 3)
+ {
+ txNew.vout[1].nValue = ((nCredit - nMinFee) / 2 / CENT) * CENT;
+ txNew.vout[2].nValue = nCredit - nMinFee - txNew.vout[1].nValue;
+ }
+ else
+ txNew.vout[1].nValue = nCredit - nMinFee;
// Sign
int nIn = 0;
continue;
for (int n=0; n < pcoin->vout.size(); n++)
{
- if (pcoin->IsSpent(n) && (txindex.vSpent.size() <= n || txindex.vSpent[n].IsNull()))
+ if (IsMine(pcoin->vout[n]) && pcoin->IsSpent(n) && (txindex.vSpent.size() <= n || txindex.vSpent[n].IsNull()))
{
- printf("CheckSpentCoins found lost coin %sppc %s[%d]\n", FormatMoney(pcoin->GetCredit()).c_str(), pcoin->GetHash().ToString().c_str(), n);
+ printf("CheckSpentCoins found lost coin %sppc %s[%d]\n", FormatMoney(pcoin->vout[n].nValue).c_str(), pcoin->GetHash().ToString().c_str(), n);
nMismatchFound++;
nBalanceInQuestion += pcoin->vout[n].nValue;
}
- else if (!pcoin->IsSpent(n) && (txindex.vSpent.size() > n && !txindex.vSpent[n].IsNull()))
+ else if (IsMine(pcoin->vout[n]) && !pcoin->IsSpent(n) && (txindex.vSpent.size() > n && !txindex.vSpent[n].IsNull()))
{
- printf("CheckSpentCoins found spent coin %sppc %s[%d]\n", FormatMoney(pcoin->GetCredit()).c_str(), pcoin->GetHash().ToString().c_str(), n);
+ printf("CheckSpentCoins found spent coin %sppc %s[%d]\n", FormatMoney(pcoin->vout[n].nValue).c_str(), pcoin->GetHash().ToString().c_str(), n);
nMismatchFound++;
nBalanceInQuestion += pcoin->vout[n].nValue;
}
continue;
for (int n=0; n < pcoin->vout.size(); n++)
{
- if (pcoin->IsSpent(n) && (txindex.vSpent.size() <= n || txindex.vSpent[n].IsNull()))
+ if (IsMine(pcoin->vout[n]) && pcoin->IsSpent(n) && (txindex.vSpent.size() <= n || txindex.vSpent[n].IsNull()))
{
- printf("FixSpentCoins found lost coin %sppc %s[%d]\n", FormatMoney(pcoin->GetCredit()).c_str(), pcoin->GetHash().ToString().c_str(), n);
+ printf("FixSpentCoins found lost coin %sppc %s[%d]\n", FormatMoney(pcoin->vout[n].nValue).c_str(), pcoin->GetHash().ToString().c_str(), n);
nMismatchFound++;
nBalanceInQuestion += pcoin->vout[n].nValue;
pcoin->MarkUnspent(n);
pcoin->WriteToDisk();
}
- else if (!pcoin->IsSpent(n) && (txindex.vSpent.size() > n && !txindex.vSpent[n].IsNull()))
+ else if (IsMine(pcoin->vout[n]) && !pcoin->IsSpent(n) && (txindex.vSpent.size() > n && !txindex.vSpent[n].IsNull()))
{
- printf("FixSpentCoins found spent coin %sppc %s[%d]\n", FormatMoney(pcoin->GetCredit()).c_str(), pcoin->GetHash().ToString().c_str(), n);
+ printf("FixSpentCoins found spent coin %sppc %s[%d]\n", FormatMoney(pcoin->vout[n].nValue).c_str(), pcoin->GetHash().ToString().c_str(), n);
nMismatchFound++;
nBalanceInQuestion += pcoin->vout[n].nValue;
pcoin->MarkSpent(n);
git://git.novaco.in / novacoin.git / blobdiff