map<uint256, CBlockIndex*> mapBlockIndex;
set<pair<COutPoint, unsigned int> > setStakeSeen;
-uint256 hashGenesisBlock = hashGenesisBlockOfficial;
+
static CBigNum bnProofOfWorkLimit(~uint256(0) >> 20);
static CBigNum bnProofOfStakeLimit(~uint256(0) >> 24);
-static CBigNum bnProofOfStakeHardLimit(~uint256(0) >> 30);
-static CBigNum bnInitialHashTarget(~uint256(0) >> 20);
+static CBigNum bnProofOfStakeHardLimit(~uint256(0) >> 30); // disabled temporarily, will be used in the future to fix minimum PoS difficulty at 0.25
+
+static CBigNum bnProofOfWorkLimitTestNet(~uint256(0) >> 16);
+static CBigNum bnProofOfStakeLimitTestNet(~uint256(0) >> 20);
+
unsigned int nStakeMinAge = 60 * 60 * 24 * 30; // minimum age for coin age
unsigned int nStakeMaxAge = 60 * 60 * 24 * 90; // stake age of full weight
unsigned int nStakeTargetSpacing = 10 * 60; // 10-minute block spacing
+unsigned int nModifierInterval = 6 * 60 * 60; // time to elapse before new modifier is computed
+
int nCoinbaseMaturity = 500;
CBlockIndex* pindexGenesisBlock = NULL;
int nBestHeight = -1;
const CTxOut& txout = vout[i];
if (txout.IsEmpty() && !IsCoinBase() && !IsCoinStake())
return DoS(100, error("CTransaction::CheckTransaction() : txout empty for user transaction"));
+
// ppcoin: enforce minimum output amount
if ((!txout.IsEmpty()) && txout.nValue < MIN_TXOUT_AMOUNT)
return DoS(100, error("CTransaction::CheckTransaction() : txout.nValue below minimum"));
+
if (txout.nValue > MAX_MONEY)
return DoS(100, error("CTransaction::CheckTransaction() : txout.nValue too high"));
nValueOut += txout.nValue;
unsigned int nNewBlockSize = nBlockSize + nBytes;
int64 nMinFee = (1 + (int64)nBytes / 1000) * nBaseFee;
- if (fAllowFree)
- {
- if (nBlockSize == 1)
- {
- // Transactions under 10K are free
- // (about 4500 BTC if made of 50 BTC inputs)
- if (nBytes < 10000)
- nMinFee = 0;
- }
- else
- {
- // Free transaction area
- if (nNewBlockSize < 27000)
- nMinFee = 0;
- }
- }
-
// To limit dust spam, require MIN_TX_FEE/MIN_RELAY_TX_FEE if any output is less than 0.01
if (nMinFee < nBaseFee)
{
return pblockOrphan->hashPrevBlock;
}
+// miner's coin base reward based on nBits
int64 GetProofOfWorkReward(unsigned int nBits)
{
CBigNum bnSubsidyLimit = MAX_MINT_PROOF_OF_WORK;
CBigNum bnTargetLimit = bnProofOfWorkLimit;
bnTargetLimit.SetCompact(bnTargetLimit.GetCompact());
- // ppcoin: subsidy is cut in half every 64x multiply of difficulty
+ // NovaCoin: subsidy is cut in half every 64x multiply of PoW difficulty
// A reasonably continuous curve is used to avoid shock to market
// (nSubsidyLimit / nSubsidy) ** 6 == bnProofOfWorkLimit / bnTarget
//
return min(nSubsidy, MAX_MINT_PROOF_OF_WORK);
}
-// ppcoin: miner's coin stake is rewarded based on coin age spent (coin-days)
-int64 GetProofOfStakeReward(int64 nCoinAge)
+// miner's coin stake reward based on nBits and coin age spent (coin-days)
+int64 GetProofOfStakeReward(int64 nCoinAge, unsigned int nBits, unsigned int nTime)
{
- static int64 nRewardCoinYear = 5 * CENT; // creation amount per coin-year
+ int64 nRewardCoinYear;
+
+ if(fTestNet || nTime > PROTOCOL_SWITCH_TIME)
+ {
+ // Stage 2 of emission process is PoS-based. It will be active on mainNet since 20 Jun 2013.
+
+ CBigNum bnRewardCoinYearLimit = MAX_MINT_PROOF_OF_STAKE; // Base stake mint rate, 100% year interest
+ CBigNum bnTarget;
+ bnTarget.SetCompact(nBits);
+ CBigNum bnTargetLimit = bnProofOfStakeLimit;
+ bnTargetLimit.SetCompact(bnTargetLimit.GetCompact());
+
+ // NovaCoin: reward for coin-year is cut in half every 64x multiply of PoS difficulty
+ // A reasonably continuous curve is used to avoid shock to market
+ // (nRewardCoinYearLimit / nRewardCoinYear) ** 6 == bnProofOfStakeLimit / bnTarget
+ //
+ // Human readable form:
+ //
+ // nRewardCoinYear = 1 / (posdiff ^ 1/6)
+
+ CBigNum bnLowerBound = 1 * CENT; // Lower interest bound is 1% per year
+ CBigNum bnUpperBound = bnRewardCoinYearLimit;
+ while (bnLowerBound + CENT <= bnUpperBound)
+ {
+ CBigNum bnMidValue = (bnLowerBound + bnUpperBound) / 2;
+ if (fDebug && GetBoolArg("-printcreation"))
+ printf("GetProofOfStakeReward() : lower=%"PRI64d" upper=%"PRI64d" mid=%"PRI64d"\n", bnLowerBound.getuint64(), bnUpperBound.getuint64(), bnMidValue.getuint64());
+ if (bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnTargetLimit > bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnTarget)
+ bnUpperBound = bnMidValue;
+ else
+ bnLowerBound = bnMidValue;
+ }
+
+ nRewardCoinYear = bnUpperBound.getuint64();
+ nRewardCoinYear = min((nRewardCoinYear / CENT) * CENT, MAX_MINT_PROOF_OF_STAKE);
+ }
+ else
+ {
+ // Old creation amount per coin-year, 5% fixed stake mint rate
+ nRewardCoinYear = 5 * CENT;
+ }
+
int64 nSubsidy = nCoinAge * 33 / (365 * 33 + 8) * nRewardCoinYear;
if (fDebug && GetBoolArg("-printcreation"))
- printf("GetProofOfStakeReward(): create=%s nCoinAge=%"PRI64d"\n", FormatMoney(nSubsidy).c_str(), nCoinAge);
+ printf("GetProofOfStakeReward(): create=%s nCoinAge=%"PRI64d" nBits=%d\n", FormatMoney(nSubsidy).c_str(), nCoinAge, nBits);
return nSubsidy;
}
{
// Proof-of-Stake blocks has own target limit since nVersion=3 supermajority on mainNet and always on testNet
if(fTestNet)
- bnTargetLimit = bnProofOfStakeHardLimit;
+ bnTargetLimit = bnProofOfStakeLimit;
else
{
- if(fTestNet || (pindexLast->nHeight + 1 > 15000))
+ if(pindexLast->nHeight + 1 > 15000)
bnTargetLimit = bnProofOfStakeLimit;
else if(pindexLast->nHeight + 1 > 14060)
bnTargetLimit = bnProofOfStakeHardLimit;
const CBlockIndex* pindexPrev = GetLastBlockIndex(pindexLast, fProofOfStake);
if (pindexPrev->pprev == NULL)
- return bnInitialHashTarget.GetCompact(); // first block
+ return bnTargetLimit.GetCompact(); // first block
const CBlockIndex* pindexPrevPrev = GetLastBlockIndex(pindexPrev->pprev, fProofOfStake);
if (pindexPrevPrev->pprev == NULL)
- return bnInitialHashTarget.GetCompact(); // second block
+ return bnTargetLimit.GetCompact(); // second block
int64 nActualSpacing = pindexPrev->GetBlockTime() - pindexPrevPrev->GetBlockTime();
if (!GetCoinAge(txdb, nCoinAge))
return error("ConnectInputs() : %s unable to get coin age for coinstake", GetHash().ToString().substr(0,10).c_str());
int64 nStakeReward = GetValueOut() - nValueIn;
- if (nStakeReward > GetProofOfStakeReward(nCoinAge) - GetMinFee() + MIN_TX_FEE)
+ if (nStakeReward > GetProofOfStakeReward(nCoinAge, pindexBlock->nBits, nTime) - GetMinFee() + MIN_TX_FEE)
return DoS(100, error("ConnectInputs() : %s stake reward exceeded", GetHash().ToString().substr(0,10).c_str()));
}
else
if (!txdb.TxnBegin())
return error("SetBestChain() : TxnBegin failed");
- if (pindexGenesisBlock == NULL && hash == hashGenesisBlock)
+ if (pindexGenesisBlock == NULL && hash == (!fTestNet ? hashGenesisBlock : hashGenesisBlockTestNet))
{
txdb.WriteHashBestChain(hash);
if (!txdb.TxnCommit())
// ppcoin: check that the block satisfies synchronized checkpoint
if (!Checkpoints::CheckSync(hash, pindexPrev))
- return error("AcceptBlock() : rejected by synchronized checkpoint");
+ {
+ if(!GetBoolArg("-nosynccheckpoints", false))
+ {
+ return error("AcceptBlock() : rejected by synchronized checkpoint");
+ }
+ else
+ {
+ strMiscWarning = _("WARNING: syncronized checkpoint violation detected, but skipped!");
+ }
+ }
// Reject block.nVersion < 3 blocks since 95% threshold on mainNet and always on testNet:
if (nVersion < 3 && ((!fTestNet && nHeight > 14060) || (fTestNet && nHeight > 0)))
// ppcoin: check block signature
bool CBlock::CheckBlockSignature() const
{
- if (GetHash() == hashGenesisBlock)
+ if (GetHash() == (!fTestNet ? hashGenesisBlock : hashGenesisBlockTestNet))
return vchBlockSig.empty();
vector<valtype> vSolutions;
pchMessageStart[2] = 0xc0;
pchMessageStart[3] = 0xef;
-
- hashGenesisBlock = hashGenesisBlockTestNet;
- nStakeMinAge = 60 * 60 * 24; // test net min age is 1 day
- nCoinbaseMaturity = 60;
+ bnProofOfStakeLimit = bnProofOfStakeLimitTestNet; // 0x00000fff PoS base target is fixed in testnet
+ bnProofOfWorkLimit = bnProofOfWorkLimitTestNet; // 0x0000ffff PoW base target is fixed in testnet
+ nStakeMinAge = 2 * 60 * 60; // test net min age is 2 hours
+ nModifierInterval = 20 * 60; // test modifier interval is 20 minutes
+ nCoinbaseMaturity = 10; // test maturity is 10 blocks
+ nStakeTargetSpacing = 3 * 60; // test block spacing is 3 minutes
}
//
block.nVersion = 1;
block.nTime = 1360105017;
block.nBits = bnProofOfWorkLimit.GetCompact();
- block.nNonce = 1575379;
+ block.nNonce = !fTestNet ? 1575379 : 46534;
//// debug print
assert(block.hashMerkleRoot == uint256("0x4cb33b3b6a861dcbc685d3e614a9cafb945738d6833f182855679f2fad02057b"));
block.print();
- assert(block.GetHash() == hashGenesisBlock);
+ assert(block.GetHash() == (!fTestNet ? hashGenesisBlock : hashGenesisBlockTestNet));
assert(block.CheckBlock());
// Start new block file
return error("LoadBlockIndex() : genesis block not accepted");
// ppcoin: initialize synchronized checkpoint
- if (!Checkpoints::WriteSyncCheckpoint(hashGenesisBlock))
+ if (!Checkpoints::WriteSyncCheckpoint((!fTestNet ? hashGenesisBlock : hashGenesisBlockTestNet)))
return error("LoadBlockIndex() : failed to init sync checkpoint");
}
if (GetBoolArg("-testsafemode"))
strRPC = "test";
-/*
+
// ppcoin: wallet lock warning for minting
if (strMintWarning != "")
{
nPriority = 0;
strStatusBar = strMintWarning;
}
-*/
// Misc warnings like out of disk space and clock is wrong
if (strMiscWarning != "")
// Add our coinbase tx as first transaction
pblock->vtx.push_back(txNew);
-
-
// Largest block you're willing to create:
unsigned int nBlockMaxSize = GetArg("-blockmaxsize", MAX_BLOCK_SIZE_GEN/2);
// Limit to betweeen 1K and MAX_BLOCK_SIZE-1K for sanity:
static int64 nLastCoinStakeSearchTime = GetAdjustedTime(); // only initialized at startup
CBlockIndex* pindexPrev = pindexBest;
- if (fProofOfStake) // attemp to find a coinstake
+ if (fProofOfStake) // attempt to find a coinstake
{
pblock->nBits = GetNextTargetRequired(pindexPrev, true);
CTransaction txCoinStake;
git://git.novaco.in / novacoin.git / blobdiff