map<uint256, CBlockIndex*> mapBlockIndex;
set<pair<COutPoint, unsigned int> > setStakeSeen;
-static CBigNum bnProofOfWorkLimit(~uint256(0) >> 20);
-static CBigNum bnProofOfStakeLimit(~uint256(0) >> 24);
-static CBigNum bnProofOfStakeHardLimit(~uint256(0) >> 30); // disabled temporarily, will be used in the future to fix minimum PoS difficulty at 0.25
+CBigNum bnProofOfWorkLimit(~uint256(0) >> 20); // "standard" scrypt target limit for proof of work, results with 0,000244140625 proof-of-work difficulty
+CBigNum bnProofOfStakeLegacyLimit(~uint256(0) >> 24); // proof of stake target limit from block #15000 and until 20 June 2013, results with 0,00390625 proof of stake difficulty
+CBigNum bnProofOfStakeLimit(~uint256(0) >> 27); // proof of stake target limit since 20 June 2013, equal to 0.03125 proof of stake difficulty
+CBigNum bnProofOfStakeHardLimit(~uint256(0) >> 30); // disabled temporarily, will be used in the future to fix minimal proof of stake difficulty at 0.25
-static CBigNum bnProofOfWorkLimitTestNet(~uint256(0) >> 16);
-static CBigNum bnProofOfStakeLimitTestNet(~uint256(0) >> 20);
+CBigNum bnProofOfWorkLimitTestNet(~uint256(0) >> 16);
-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 nStakeMinAge = 60 * 60 * 24 * 30; // 30 days as minimum age for coin age
+unsigned int nStakeMaxAge = 60 * 60 * 24 * 90; // 90 days as stake age of full weight
+unsigned int nStakeTargetSpacing = 10 * 60; // 10-minute stakes spacing
unsigned int nModifierInterval = 6 * 60 * 60; // time to elapse before new modifier is computed
int nCoinbaseMaturity = 500;
return pblockOrphan->hashPrevBlock;
}
+// select stake target limit according to hard-coded conditions
+CBigNum static GetProofOfStakeLimit(int nHeight, unsigned int nTime)
+{
+ if(fTestNet) // separate proof of stake target limit for testnet
+ return bnProofOfStakeLimit;
+ if(nTime > TARGETS_SWITCH_TIME) // 27 bits since 20 July 2013
+ return bnProofOfStakeLimit;
+ if(nHeight + 1 > 15000) // 24 bits since block 15000
+ return bnProofOfStakeLegacyLimit;
+ if(nHeight + 1 > 14060) // 31 bits since block 14060 until 15000
+ return bnProofOfStakeHardLimit;
+
+ return bnProofOfWorkLimit; // return bnProofOfWorkLimit of none matched
+}
+
// miner's coin base reward based on nBits
int64 GetProofOfWorkReward(unsigned int nBits)
{
CBigNum bnSubsidyLimit = MAX_MINT_PROOF_OF_WORK;
+
CBigNum bnTarget;
bnTarget.SetCompact(nBits);
CBigNum bnTargetLimit = bnProofOfWorkLimit;
{
int64 nRewardCoinYear;
- if(fTestNet || nTime > PROTOCOL_SWITCH_TIME)
+ if(fTestNet || nTime > STAKE_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;
+ CBigNum bnTargetLimit = GetProofOfStakeLimit(0, nTime);
bnTargetLimit.SetCompact(bnTargetLimit.GetCompact());
// NovaCoin: reward for coin-year is cut in half every 64x multiply of PoS difficulty
}
static const int64 nTargetTimespan = 7 * 24 * 60 * 60; // one week
-static const int64 nTargetSpacingWorkMax = 12 * nStakeTargetSpacing; // 2-hour
+
+// get proof of work blocks max spacing according to hard-coded conditions
+int64 static GetTargetSpacingWorkMax(int nHeight, unsigned int nTime)
+{
+ if(nTime > TARGETS_SWITCH_TIME)
+ return 3 * nStakeTargetSpacing; // 30 minutes on mainNet since 20 Jul 2013 00:00:00
+
+ if(fTestNet)
+ return 3 * nStakeTargetSpacing; // 15 minutes on testNet
+
+ return 12 * nStakeTargetSpacing; // 2 hours otherwise
+}
//
// minimum amount of work that could possibly be required nTime after
return pindex;
}
-unsigned int static GetNextTargetRequired(const CBlockIndex* pindexLast, bool fProofOfStake)
+unsigned int GetNextTargetRequired(const CBlockIndex* pindexLast, bool fProofOfStake)
{
- CBigNum bnTargetLimit = bnProofOfWorkLimit;
-
- if(fProofOfStake)
- {
- // Proof-of-Stake blocks has own target limit since nVersion=3 supermajority on mainNet and always on testNet
- if(fTestNet)
- bnTargetLimit = bnProofOfStakeLimit;
- else
- {
- if(pindexLast->nHeight + 1 > 15000)
- bnTargetLimit = bnProofOfStakeLimit;
- else if(pindexLast->nHeight + 1 > 14060)
- bnTargetLimit = bnProofOfStakeHardLimit;
- }
- }
+ CBigNum bnTargetLimit = !fProofOfStake ? bnProofOfWorkLimit : GetProofOfStakeLimit(pindexLast->nHeight, pindexLast->nTime);
if (pindexLast == NULL)
return bnTargetLimit.GetCompact(); // genesis block
// ppcoin: retarget with exponential moving toward target spacing
CBigNum bnNew;
bnNew.SetCompact(pindexPrev->nBits);
- int64 nTargetSpacing = fProofOfStake? nStakeTargetSpacing : min(nTargetSpacingWorkMax, (int64) nStakeTargetSpacing * (1 + pindexLast->nHeight - pindexPrev->nHeight));
+ int64 nTargetSpacing = fProofOfStake? nStakeTargetSpacing : min(GetTargetSpacingWorkMax(pindexLast->nHeight, pindexLast->nTime), (int64) nStakeTargetSpacing * (1 + pindexLast->nHeight - pindexPrev->nHeight));
int64 nInterval = nTargetTimespan / nTargetSpacing;
bnNew *= ((nInterval - 1) * nTargetSpacing + nActualSpacing + nActualSpacing);
bnNew /= ((nInterval + 1) * nTargetSpacing);
if (vtx.empty() || vtx.size() > MAX_BLOCK_SIZE || ::GetSerializeSize(*this, SER_NETWORK, PROTOCOL_VERSION) > MAX_BLOCK_SIZE)
return DoS(100, error("CheckBlock() : size limits failed"));
+ // Special short-term limits to avoid 10,000 BDB lock limit:
+ if (GetBlockTime() < LOCKS_SWITCH_TIME)
+ {
+ // Rule is: #unique txids referenced <= 4,500
+ // ... to prevent 10,000 BDB lock exhaustion on old clients
+ set<uint256> setTxIn;
+ for (size_t i = 0; i < vtx.size(); i++)
+ {
+ setTxIn.insert(vtx[i].GetHash());
+ if (i == 0) continue; // skip coinbase txin
+ BOOST_FOREACH(const CTxIn& txin, vtx[i].vin)
+ setTxIn.insert(txin.prevout.hash);
+ }
+ size_t nTxids = setTxIn.size();
+ if (nTxids > 4500)
+ return error("CheckBlock() : maxlocks violation");
+ }
+
// Check proof of work matches claimed amount
if (fCheckPOW && IsProofOfWork() && !CheckProofOfWork(GetHash(), nBits))
return DoS(50, error("CheckBlock() : proof of work failed"));
pchMessageStart[2] = 0xc0;
pchMessageStart[3] = 0xef;
- bnProofOfStakeLimit = bnProofOfStakeLimitTestNet; // 0x00000fff PoS base target is fixed in testnet
- bnProofOfWorkLimit = bnProofOfWorkLimitTestNet; // 0x0000ffff PoW base target is fixed in testnet
+ bnProofOfWorkLimit = bnProofOfWorkLimitTestNet; // 16 bits PoW target limit for 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
+ nStakeTargetSpacing = 5 * 60; // test block spacing is 5 minutes
}
//
if (!fAllowNew)
return false;
- // Genesis Block:
- // 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
-
// Genesis block
+
+ // MainNet:
+
+ //CBlock(hash=00000a060336cbb72fe969666d337b87198b1add2abaa59cca226820b32933a4, ver=1, hashPrevBlock=0000000000000000000000000000000000000000000000000000000000000000, hashMerkleRoot=4cb33b3b6a861dcbc685d3e614a9cafb945738d6833f182855679f2fad02057b, nTime=1360105017, nBits=1e0fffff, nNonce=1575379, vtx=1, vchBlockSig=)
+ // Coinbase(hash=4cb33b3b6a, nTime=1360105017, ver=1, vin.size=1, vout.size=1, nLockTime=0)
+ // CTxIn(COutPoint(0000000000, 4294967295), coinbase 04ffff001d020f274468747470733a2f2f626974636f696e74616c6b2e6f72672f696e6465782e7068703f746f7069633d3133343137392e6d736731353032313936236d736731353032313936)
+ // CTxOut(empty)
+ // vMerkleTree: 4cb33b3b6a
+
+ // TestNet:
+
+ //CBlock(hash=0000c763e402f2436da9ed36c7286f62c3f6e5dbafce9ff289bd43d7459327eb, ver=1, hashPrevBlock=0000000000000000000000000000000000000000000000000000000000000000, hashMerkleRoot=4cb33b3b6a861dcbc685d3e614a9cafb945738d6833f182855679f2fad02057b, nTime=1360105017, nBits=1f00ffff, nNonce=46534, vtx=1, vchBlockSig=)
+ // Coinbase(hash=4cb33b3b6a, nTime=1360105017, ver=1, vin.size=1, vout.size=1, nLockTime=0)
+ // CTxIn(COutPoint(0000000000, 4294967295), coinbase 04ffff001d020f274468747470733a2f2f626974636f696e74616c6b2e6f72672f696e6465782e7068703f746f7069633d3133343137392e6d736731353032313936236d736731353032313936)
+ // CTxOut(empty)
+ // vMerkleTree: 4cb33b3b6a
+
const char* pszTimestamp = "https://bitcointalk.org/index.php?topic=134179.msg1502196#msg1502196";
CTransaction txNew;
txNew.nTime = 1360105017;
// Limit to betweeen 1K and MAX_BLOCK_SIZE-1K for sanity:
nBlockMaxSize = std::max((unsigned int)1000, std::min((unsigned int)(MAX_BLOCK_SIZE-1000), nBlockMaxSize));
+ // Special compatibility rule before 20 Aug: limit size to 500,000 bytes:
+ if (GetAdjustedTime() < LOCKS_SWITCH_TIME)
+ nBlockMaxSize = std::min(nBlockMaxSize, (unsigned int)(MAX_BLOCK_SIZE_GEN));
+
// How much of the block should be dedicated to high-priority transactions,
// included regardless of the fees they pay
unsigned int nBlockPrioritySize = GetArg("-blockprioritysize", 27000);