1 // Copyright (c) 2009-2010 Satoshi Nakamoto
2 // Copyright (c) 2009-2012 The Bitcoin developers
3 // Distributed under the MIT/X11 software license, see the accompanying
4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
10 #include "timestamps.h"
29 class CRequestTracker;
36 static const unsigned int MAX_BLOCK_SIZE = 1000000;
37 static const unsigned int MAX_BLOCK_SIZE_GEN = MAX_BLOCK_SIZE/2;
38 static const unsigned int MAX_BLOCK_SIGOPS = MAX_BLOCK_SIZE/50;
39 static const unsigned int MAX_ORPHAN_TRANSACTIONS = MAX_BLOCK_SIZE/100;
40 static const unsigned int MAX_INV_SZ = 50000;
42 static const int64_t MIN_TX_FEE = CENT/10;
43 static const int64_t MIN_RELAY_TX_FEE = CENT/50;
45 static const int64_t MAX_MONEY = 2000000000 * COIN;
46 static const int64_t MAX_MINT_PROOF_OF_WORK = 100 * COIN;
47 static const int64_t MAX_MINT_PROOF_OF_STAKE = 1 * COIN;
48 static const int64_t MIN_TXOUT_AMOUNT = CENT/100;
50 inline bool MoneyRange(int64_t nValue) { return (nValue >= 0 && nValue <= MAX_MONEY); }
51 // Threshold for nLockTime: below this value it is interpreted as block number, otherwise as UNIX timestamp.
52 static const unsigned int LOCKTIME_THRESHOLD = 500000000; // Tue Nov 5 00:53:20 1985 UTC
53 // Maximum number of script-checking threads allowed
54 static const int MAX_SCRIPTCHECK_THREADS = 16;
57 static const int fHaveUPnP = true;
59 static const int fHaveUPnP = false;
62 static const uint256 hashGenesisBlock("0x00000a060336cbb72fe969666d337b87198b1add2abaa59cca226820b32933a4");
63 static const uint256 hashGenesisBlockTestNet("0x000c763e402f2436da9ed36c7286f62c3f6e5dbafce9ff289bd43d7459327eb");
65 inline int64_t PastDrift(int64_t nTime) { return nTime - 2 * 60 * 60; } // up to 2 hours from the past
66 inline int64_t FutureDrift(int64_t nTime) { return nTime + 2 * 60 * 60; } // up to 2 hours from the future
68 extern CScript COINBASE_FLAGS;
69 extern CCriticalSection cs_main;
70 extern std::map<uint256, CBlockIndex*> mapBlockIndex;
71 extern std::set<std::pair<COutPoint, unsigned int> > setStakeSeen;
72 extern CBlockIndex* pindexGenesisBlock;
73 extern unsigned int nNodeLifespan;
74 extern unsigned int nStakeMinAge;
75 extern int nCoinbaseMaturity;
76 extern int nBestHeight;
77 extern uint256 nBestChainTrust;
78 extern uint256 nBestInvalidTrust;
79 extern uint256 hashBestChain;
80 extern CBlockIndex* pindexBest;
81 extern unsigned int nTransactionsUpdated;
82 extern uint64_t nLastBlockTx;
83 extern uint64_t nLastBlockSize;
84 extern int64_t nLastCoinStakeSearchInterval;
85 extern const std::string strMessageMagic;
86 extern int64_t nTimeBestReceived;
87 extern CCriticalSection cs_setpwalletRegistered;
88 extern std::set<CWallet*> setpwalletRegistered;
89 extern unsigned char pchMessageStart[4];
90 extern std::map<uint256, CBlock*> mapOrphanBlocks;
93 extern int64_t nTransactionFee;
94 extern int64_t nMinimumInputValue;
95 extern bool fUseFastIndex;
96 extern unsigned int nDerivationMethodIndex;
97 extern int nScriptCheckThreads;
99 // Minimum disk space required - used in CheckDiskSpace()
100 static const uint64_t nMinDiskSpace = 52428800;
107 void RegisterWallet(CWallet* pwalletIn);
108 void UnregisterWallet(CWallet* pwalletIn);
109 void SyncWithWallets(const CTransaction& tx, const CBlock* pblock = NULL, bool fUpdate = false, bool fConnect = true);
110 bool ProcessBlock(CNode* pfrom, CBlock* pblock);
111 bool CheckDiskSpace(uint64_t nAdditionalBytes=0);
112 FILE* OpenBlockFile(unsigned int nFile, unsigned int nBlockPos, const char* pszMode="rb");
113 FILE* AppendBlockFile(unsigned int& nFileRet);
114 bool LoadBlockIndex(bool fAllowNew=true);
115 void PrintBlockTree();
116 CBlockIndex* FindBlockByHeight(int nHeight);
117 bool ProcessMessages(CNode* pfrom);
118 bool SendMessages(CNode* pto, bool fSendTrickle);
119 bool LoadExternalBlockFile(FILE* fileIn);
121 // Run an instance of the script checking thread
122 void ThreadScriptCheck(void* parg);
123 // Stop the script checking threads
124 void ThreadScriptCheckQuit();
126 bool CheckProofOfWork(uint256 hash, unsigned int nBits);
127 unsigned int GetNextTargetRequired(const CBlockIndex* pindexLast, bool fProofOfStake);
128 int64_t GetProofOfWorkReward(unsigned int nBits, int64_t nFees=0);
129 int64_t GetProofOfStakeReward(int64_t nCoinAge, unsigned int nBits, unsigned int nTime, bool bCoinYearOnly=false);
130 unsigned int ComputeMinWork(unsigned int nBase, int64_t nTime);
131 unsigned int ComputeMinStake(unsigned int nBase, int64_t nTime, unsigned int nBlockTime);
132 int GetNumBlocksOfPeers();
133 bool IsInitialBlockDownload();
134 std::string GetWarnings(std::string strFor);
135 bool GetTransaction(const uint256 &hash, CTransaction &tx, uint256 &hashBlock);
136 uint256 WantedByOrphan(const CBlock* pblockOrphan);
137 const CBlockIndex* GetLastBlockIndex(const CBlockIndex* pindex, bool fProofOfStake);
138 void StakeMiner(CWallet *pwallet);
139 void ResendWalletTransactions();
141 bool VerifySignature(const CTransaction& txFrom, const CTransaction& txTo, unsigned int nIn, unsigned int flags, int nHashType);
149 bool GetWalletFile(CWallet* pwallet, std::string &strWalletFileOut);
151 /** Position on disk for a particular transaction. */
164 CDiskTxPos(unsigned int nFileIn, unsigned int nBlockPosIn, unsigned int nTxPosIn)
167 nBlockPos = nBlockPosIn;
171 IMPLEMENT_SERIALIZE( READWRITE(FLATDATA(*this)); )
172 void SetNull() { nFile = (unsigned int) -1; nBlockPos = 0; nTxPos = 0; }
173 bool IsNull() const { return (nFile == (unsigned int) -1); }
175 friend bool operator==(const CDiskTxPos& a, const CDiskTxPos& b)
177 return (a.nFile == b.nFile &&
178 a.nBlockPos == b.nBlockPos &&
179 a.nTxPos == b.nTxPos);
182 friend bool operator!=(const CDiskTxPos& a, const CDiskTxPos& b)
188 std::string ToString() const
193 return strprintf("(nFile=%u, nBlockPos=%u, nTxPos=%u)", nFile, nBlockPos, nTxPos);
198 printf("%s", ToString().c_str());
204 /** An inpoint - a combination of a transaction and an index n into its vin */
211 CInPoint() { SetNull(); }
212 CInPoint(CTransaction* ptxIn, unsigned int nIn) { ptx = ptxIn; n = nIn; }
213 void SetNull() { ptx = NULL; n = (unsigned int) -1; }
214 bool IsNull() const { return (ptx == NULL && n == (unsigned int) -1); }
219 /** An outpoint - a combination of a transaction hash and an index n into its vout */
226 COutPoint() { SetNull(); }
227 COutPoint(uint256 hashIn, unsigned int nIn) { hash = hashIn; n = nIn; }
228 IMPLEMENT_SERIALIZE( READWRITE(FLATDATA(*this)); )
229 void SetNull() { hash = 0; n = (unsigned int) -1; }
230 bool IsNull() const { return (hash == 0 && n == (unsigned int) -1); }
232 friend bool operator<(const COutPoint& a, const COutPoint& b)
234 return (a.hash < b.hash || (a.hash == b.hash && a.n < b.n));
237 friend bool operator==(const COutPoint& a, const COutPoint& b)
239 return (a.hash == b.hash && a.n == b.n);
242 friend bool operator!=(const COutPoint& a, const COutPoint& b)
247 std::string ToString() const
249 return strprintf("COutPoint(%s, %u)", hash.ToString().substr(0,10).c_str(), n);
254 printf("%s\n", ToString().c_str());
261 /** An input of a transaction. It contains the location of the previous
262 * transaction's output that it claims and a signature that matches the
263 * output's public key.
274 nSequence = std::numeric_limits<unsigned int>::max();
277 explicit CTxIn(COutPoint prevoutIn, CScript scriptSigIn=CScript(), unsigned int nSequenceIn=std::numeric_limits<unsigned int>::max())
280 scriptSig = scriptSigIn;
281 nSequence = nSequenceIn;
284 CTxIn(uint256 hashPrevTx, unsigned int nOut, CScript scriptSigIn=CScript(), unsigned int nSequenceIn=std::numeric_limits<unsigned int>::max())
286 prevout = COutPoint(hashPrevTx, nOut);
287 scriptSig = scriptSigIn;
288 nSequence = nSequenceIn;
294 READWRITE(scriptSig);
295 READWRITE(nSequence);
300 return (nSequence == std::numeric_limits<unsigned int>::max());
303 friend bool operator==(const CTxIn& a, const CTxIn& b)
305 return (a.prevout == b.prevout &&
306 a.scriptSig == b.scriptSig &&
307 a.nSequence == b.nSequence);
310 friend bool operator!=(const CTxIn& a, const CTxIn& b)
315 std::string ToStringShort() const
317 return strprintf(" %s %d", prevout.hash.ToString().c_str(), prevout.n);
320 std::string ToString() const
324 str += prevout.ToString();
325 if (prevout.IsNull())
326 str += strprintf(", coinbase %s", HexStr(scriptSig).c_str());
328 str += strprintf(", scriptSig=%s", scriptSig.ToString().substr(0,24).c_str());
329 if (nSequence != std::numeric_limits<unsigned int>::max())
330 str += strprintf(", nSequence=%u", nSequence);
337 printf("%s\n", ToString().c_str());
344 /** An output of a transaction. It contains the public key that the next input
345 * must be able to sign with to claim it.
351 CScript scriptPubKey;
358 CTxOut(int64_t nValueIn, CScript scriptPubKeyIn)
361 scriptPubKey = scriptPubKeyIn;
367 READWRITE(scriptPubKey);
373 scriptPubKey.clear();
378 return (nValue == -1);
384 scriptPubKey.clear();
389 return (nValue == 0 && scriptPubKey.empty());
392 uint256 GetHash() const
394 return SerializeHash(*this);
397 friend bool operator==(const CTxOut& a, const CTxOut& b)
399 return (a.nValue == b.nValue &&
400 a.scriptPubKey == b.scriptPubKey);
403 friend bool operator!=(const CTxOut& a, const CTxOut& b)
408 std::string ToStringShort() const
410 return strprintf(" out %s %s", FormatMoney(nValue).c_str(), scriptPubKey.ToString(true).c_str());
413 std::string ToString() const
415 if (IsEmpty()) return "CTxOut(empty)";
416 if (scriptPubKey.size() < 6)
417 return "CTxOut(error)";
418 return strprintf("CTxOut(nValue=%s, scriptPubKey=%s)", FormatMoney(nValue).c_str(), scriptPubKey.ToString().c_str());
423 printf("%s\n", ToString().c_str());
437 typedef std::map<uint256, std::pair<CTxIndex, CTransaction> > MapPrevTx;
439 /** The basic transaction that is broadcasted on the network and contained in
440 * blocks. A transaction can contain multiple inputs and outputs.
445 static const int CURRENT_VERSION=1;
448 std::vector<CTxIn> vin;
449 std::vector<CTxOut> vout;
452 // Denial-of-service detection:
454 bool DoS(int nDoSIn, bool fIn) const { nDoS += nDoSIn; return fIn; }
463 READWRITE(this->nVersion);
464 nVersion = this->nVersion;
468 READWRITE(nLockTime);
473 nVersion = CTransaction::CURRENT_VERSION;
474 nTime = (uint32_t) GetAdjustedTime();
478 nDoS = 0; // Denial-of-service prevention
483 return (vin.empty() && vout.empty());
486 uint256 GetHash() const
488 return SerializeHash(*this);
491 bool IsFinal(int nBlockHeight=0, int64_t nBlockTime=0) const
493 // Time based nLockTime implemented in 0.1.6
496 if (nBlockHeight == 0)
497 nBlockHeight = nBestHeight;
499 nBlockTime = GetAdjustedTime();
500 if ((int64_t)nLockTime < ((int64_t)nLockTime < LOCKTIME_THRESHOLD ? (int64_t)nBlockHeight : nBlockTime))
502 BOOST_FOREACH(const CTxIn& txin, vin)
508 bool IsNewerThan(const CTransaction& old) const
510 if (vin.size() != old.vin.size())
512 for (unsigned int i = 0; i < vin.size(); i++)
513 if (vin[i].prevout != old.vin[i].prevout)
517 unsigned int nLowest = std::numeric_limits<unsigned int>::max();
518 for (unsigned int i = 0; i < vin.size(); i++)
520 if (vin[i].nSequence != old.vin[i].nSequence)
522 if (vin[i].nSequence <= nLowest)
525 nLowest = vin[i].nSequence;
527 if (old.vin[i].nSequence < nLowest)
530 nLowest = old.vin[i].nSequence;
537 bool IsCoinBase() const
539 return (vin.size() == 1 && vin[0].prevout.IsNull() && vout.size() >= 1);
542 bool IsCoinStake() const
544 // ppcoin: the coin stake transaction is marked with the first output empty
545 return (vin.size() > 0 && (!vin[0].prevout.IsNull()) && vout.size() >= 2 && vout[0].IsEmpty());
548 /** Check for standard transaction types
549 @return True if all outputs (scriptPubKeys) use only standard transaction forms
551 bool IsStandard(std::string& strReason) const;
552 bool IsStandard() const
554 std::string strReason;
555 return IsStandard(strReason);
558 /** Check for standard transaction types
559 @param[in] mapInputs Map of previous transactions that have outputs we're spending
560 @return True if all inputs (scriptSigs) use only standard transaction forms
561 @see CTransaction::FetchInputs
563 bool AreInputsStandard(const MapPrevTx& mapInputs) const;
565 /** Count ECDSA signature operations the old-fashioned (pre-0.6) way
566 @return number of sigops this transaction's outputs will produce when spent
567 @see CTransaction::FetchInputs
569 unsigned int GetLegacySigOpCount() const;
571 /** Count ECDSA signature operations in pay-to-script-hash inputs.
573 @param[in] mapInputs Map of previous transactions that have outputs we're spending
574 @return maximum number of sigops required to validate this transaction's inputs
575 @see CTransaction::FetchInputs
577 unsigned int GetP2SHSigOpCount(const MapPrevTx& mapInputs) const;
579 /** Amount of bitcoins spent by this transaction.
580 @return sum of all outputs (note: does not include fees)
582 int64_t GetValueOut() const
584 int64_t nValueOut = 0;
585 BOOST_FOREACH(const CTxOut& txout, vout)
587 nValueOut += txout.nValue;
588 if (!MoneyRange(txout.nValue) || !MoneyRange(nValueOut))
589 throw std::runtime_error("CTransaction::GetValueOut() : value out of range");
594 /** Amount of bitcoins coming in to this transaction
595 Note that lightweight clients may not know anything besides the hash of previous transactions,
596 so may not be able to calculate this.
598 @param[in] mapInputs Map of previous transactions that have outputs we're spending
599 @return Sum of value of all inputs (scriptSigs)
600 @see CTransaction::FetchInputs
602 int64_t GetValueIn(const MapPrevTx& mapInputs) const;
604 static bool AllowFree(double dPriority)
606 // Large (in bytes) low-priority (new, small-coin) transactions
608 return dPriority > COIN * 144 / 250;
611 int64_t GetMinFee(unsigned int nBlockSize=1, bool fAllowFree=false, enum GetMinFee_mode mode=GMF_BLOCK, unsigned int nBytes = 0) const;
613 bool ReadFromDisk(CDiskTxPos pos, FILE** pfileRet=NULL)
615 CAutoFile filein = CAutoFile(OpenBlockFile(pos.nFile, 0, pfileRet ? "rb+" : "rb"), SER_DISK, CLIENT_VERSION);
617 return error("CTransaction::ReadFromDisk() : OpenBlockFile failed");
620 if (fseek(filein, pos.nTxPos, SEEK_SET) != 0)
621 return error("CTransaction::ReadFromDisk() : fseek failed");
626 catch (std::exception &e) {
628 return error("%s() : deserialize or I/O error", BOOST_CURRENT_FUNCTION);
631 // Return file pointer
634 if (fseek(filein, pos.nTxPos, SEEK_SET) != 0)
635 return error("CTransaction::ReadFromDisk() : second fseek failed");
636 *pfileRet = filein.release();
641 friend bool operator==(const CTransaction& a, const CTransaction& b)
643 return (a.nVersion == b.nVersion &&
644 a.nTime == b.nTime &&
647 a.nLockTime == b.nLockTime);
650 friend bool operator!=(const CTransaction& a, const CTransaction& b)
655 std::string ToStringShort() const
658 str += strprintf("%s %s", GetHash().ToString().c_str(), IsCoinBase()? "base" : (IsCoinStake()? "stake" : "user"));
662 std::string ToString() const
665 str += IsCoinBase()? "Coinbase" : (IsCoinStake()? "Coinstake" : "CTransaction");
666 str += strprintf("(hash=%s, nTime=%d, ver=%d, vin.size=%" PRIszu ", vout.size=%" PRIszu ", nLockTime=%d)\n",
667 GetHash().ToString().substr(0,10).c_str(),
673 for (unsigned int i = 0; i < vin.size(); i++)
674 str += " " + vin[i].ToString() + "\n";
675 for (unsigned int i = 0; i < vout.size(); i++)
676 str += " " + vout[i].ToString() + "\n";
682 printf("%s", ToString().c_str());
686 bool ReadFromDisk(CTxDB& txdb, COutPoint prevout, CTxIndex& txindexRet);
687 bool ReadFromDisk(CTxDB& txdb, COutPoint prevout);
688 bool ReadFromDisk(COutPoint prevout);
689 bool DisconnectInputs(CTxDB& txdb);
691 /** Fetch from memory and/or disk. inputsRet keys are transaction hashes.
693 @param[in] txdb Transaction database
694 @param[in] mapTestPool List of pending changes to the transaction index database
695 @param[in] fBlock True if being called to add a new best-block to the chain
696 @param[in] fMiner True if being called by CreateNewBlock
697 @param[out] inputsRet Pointers to this transaction's inputs
698 @param[out] fInvalid returns true if transaction is invalid
699 @return Returns true if all inputs are in txdb or mapTestPool
701 bool FetchInputs(CTxDB& txdb, const std::map<uint256, CTxIndex>& mapTestPool,
702 bool fBlock, bool fMiner, MapPrevTx& inputsRet, bool& fInvalid);
704 /** Sanity check previous transactions, then, if all checks succeed,
705 mark them as spent by this transaction.
707 @param[in] inputs Previous transactions (from FetchInputs)
708 @param[out] mapTestPool Keeps track of inputs that need to be updated on disk
709 @param[in] posThisTx Position of this transaction on disk
710 @param[in] pindexBlock
711 @param[in] fBlock true if called from ConnectBlock
712 @param[in] fMiner true if called from CreateNewBlock
713 @param[in] fScriptChecks enable scripts validation?
714 @param[in] flags STRICT_FLAGS script validation flags
715 @param[in] pvChecks NULL If pvChecks is not NULL, script checks are pushed onto it instead of being performed inline.
716 @return Returns true if all checks succeed
718 bool ConnectInputs(CTxDB& txdb, MapPrevTx inputs, std::map<uint256, CTxIndex>& mapTestPool, const CDiskTxPos& posThisTx, const CBlockIndex* pindexBlock,
719 bool fBlock, bool fMiner, bool fScriptChecks=true,
720 unsigned int flags=STRICT_FLAGS, std::vector<CScriptCheck> *pvChecks = NULL);
721 bool ClientConnectInputs();
722 bool CheckTransaction() const;
723 bool AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs=true, bool* pfMissingInputs=NULL);
724 bool GetCoinAge(CTxDB& txdb, uint64_t& nCoinAge) const; // ppcoin: get transaction coin age
727 const CTxOut& GetOutputFor(const CTxIn& input, const MapPrevTx& inputs) const;
730 /** Closure representing one script verification
731 * Note that this stores references to the spending transaction */
735 CScript scriptPubKey;
736 const CTransaction *ptxTo;
743 CScriptCheck(const CTransaction& txFromIn, const CTransaction& txToIn, unsigned int nInIn, unsigned int nFlagsIn, int nHashTypeIn) :
744 scriptPubKey(txFromIn.vout[txToIn.vin[nInIn].prevout.n].scriptPubKey),
745 ptxTo(&txToIn), nIn(nInIn), nFlags(nFlagsIn), nHashType(nHashTypeIn) { }
747 bool operator()() const;
749 void swap(CScriptCheck &check) {
750 scriptPubKey.swap(check.scriptPubKey);
751 std::swap(ptxTo, check.ptxTo);
752 std::swap(nIn, check.nIn);
753 std::swap(nFlags, check.nFlags);
754 std::swap(nHashType, check.nHashType);
761 /** A transaction with a merkle branch linking it to the block chain. */
762 class CMerkleTx : public CTransaction
766 std::vector<uint256> vMerkleBranch;
770 mutable bool fMerkleVerified;
778 CMerkleTx(const CTransaction& txIn) : CTransaction(txIn)
787 fMerkleVerified = false;
793 nSerSize += SerReadWrite(s, *(CTransaction*)this, nType, nVersion, ser_action);
794 nVersion = this->nVersion;
795 READWRITE(hashBlock);
796 READWRITE(vMerkleBranch);
801 int SetMerkleBranch(const CBlock* pblock=NULL);
802 int GetDepthInMainChain(CBlockIndex* &pindexRet) const;
803 int GetDepthInMainChain() const { CBlockIndex *pindexRet; return GetDepthInMainChain(pindexRet); }
804 bool IsInMainChain() const { return GetDepthInMainChain() > 0; }
805 int GetBlocksToMaturity() const;
806 bool AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs=true);
807 bool AcceptToMemoryPool();
813 /** A txdb record that contains the disk location of a transaction and the
814 * locations of transactions that spend its outputs. vSpent is really only
815 * used as a flag, but having the location is very helpful for debugging.
821 std::vector<CDiskTxPos> vSpent;
828 CTxIndex(const CDiskTxPos& posIn, unsigned int nOutputs)
831 vSpent.resize(nOutputs);
836 if (!(nType & SER_GETHASH))
853 friend bool operator==(const CTxIndex& a, const CTxIndex& b)
855 return (a.pos == b.pos &&
856 a.vSpent == b.vSpent);
859 friend bool operator!=(const CTxIndex& a, const CTxIndex& b)
863 int GetDepthInMainChain() const;
871 /** Nodes collect new transactions into a block, hash them into a hash tree,
872 * and scan through nonce values to make the block's hash satisfy proof-of-work
873 * requirements. When they solve the proof-of-work, they broadcast the block
874 * to everyone and the block is added to the block chain. The first transaction
875 * in the block is a special one that creates a new coin owned by the creator
878 * Blocks are appended to blk0001.dat files on disk. Their location on disk
879 * is indexed by CBlockIndex objects in memory.
885 static const int CURRENT_VERSION=6;
887 uint256 hashPrevBlock;
888 uint256 hashMerkleRoot;
894 std::vector<CTransaction> vtx;
896 // ppcoin: block signature - signed by one of the coin base txout[N]'s owner
897 std::vector<unsigned char> vchBlockSig;
900 mutable std::vector<uint256> vMerkleTree;
902 // Denial-of-service detection:
904 bool DoS(int nDoSIn, bool fIn) const { nDoS += nDoSIn; return fIn; }
913 READWRITE(this->nVersion);
914 nVersion = this->nVersion;
915 READWRITE(hashPrevBlock);
916 READWRITE(hashMerkleRoot);
921 // ConnectBlock depends on vtx following header to generate CDiskTxPos
922 if (!(nType & (SER_GETHASH|SER_BLOCKHEADERONLY)))
925 READWRITE(vchBlockSig);
929 const_cast<CBlock*>(this)->vtx.clear();
930 const_cast<CBlock*>(this)->vchBlockSig.clear();
936 nVersion = CBlock::CURRENT_VERSION;
953 uint256 GetHash() const
955 return scrypt_blockhash((const uint8_t*)&nVersion);
958 int64_t GetBlockTime() const
960 return (int64_t)nTime;
963 void UpdateTime(const CBlockIndex* pindexPrev);
965 // ppcoin: entropy bit for stake modifier if chosen by modifier
966 unsigned int GetStakeEntropyBit(unsigned int nTime) const
968 // Protocol switch to support p2pool at novacoin block #9689
969 if (nTime >= ENTROPY_SWITCH_TIME || fTestNet)
971 // Take last bit of block hash as entropy bit
972 unsigned int nEntropyBit = ((GetHash().Get64()) & 1ULL);
973 if (fDebug && GetBoolArg("-printstakemodifier"))
974 printf("GetStakeEntropyBit: nTime=%u hashBlock=%s nEntropyBit=%u\n", nTime, GetHash().ToString().c_str(), nEntropyBit);
977 // Before novacoin block #9689 - old protocol
978 uint160 hashSig = Hash160(vchBlockSig);
979 if (fDebug && GetBoolArg("-printstakemodifier"))
980 printf("GetStakeEntropyBit: hashSig=%s", hashSig.ToString().c_str());
981 hashSig >>= 159; // take the first bit of the hash
982 if (fDebug && GetBoolArg("-printstakemodifier"))
983 printf(" entropybit=%" PRId64 "\n", hashSig.Get64());
984 return (unsigned int)hashSig.Get64();
987 // ppcoin: two types of block: proof-of-work or proof-of-stake
988 bool IsProofOfStake() const
990 return (vtx.size() > 1 && vtx[1].IsCoinStake());
993 bool IsProofOfWork() const
995 return !IsProofOfStake();
998 std::pair<COutPoint, unsigned int> GetProofOfStake() const
1000 return IsProofOfStake()? std::make_pair(vtx[1].vin[0].prevout, vtx[1].nTime) : std::make_pair(COutPoint(), (unsigned int)0);
1003 // ppcoin: get max transaction timestamp
1004 int64_t GetMaxTransactionTime() const
1006 int64_t maxTransactionTime = 0;
1007 BOOST_FOREACH(const CTransaction& tx, vtx)
1008 maxTransactionTime = std::max(maxTransactionTime, (int64_t)tx.nTime);
1009 return maxTransactionTime;
1012 uint256 BuildMerkleTree() const
1014 vMerkleTree.clear();
1015 BOOST_FOREACH(const CTransaction& tx, vtx)
1016 vMerkleTree.push_back(tx.GetHash());
1018 for (int nSize = (int)vtx.size(); nSize > 1; nSize = (nSize + 1) / 2)
1020 for (int i = 0; i < nSize; i += 2)
1022 int i2 = std::min(i+1, nSize-1);
1023 vMerkleTree.push_back(Hash(BEGIN(vMerkleTree[j+i]), END(vMerkleTree[j+i]),
1024 BEGIN(vMerkleTree[j+i2]), END(vMerkleTree[j+i2])));
1028 return (vMerkleTree.empty() ? 0 : vMerkleTree.back());
1031 std::vector<uint256> GetMerkleBranch(int nIndex) const
1033 if (vMerkleTree.empty())
1035 std::vector<uint256> vMerkleBranch;
1037 for (int nSize = (int)vtx.size(); nSize > 1; nSize = (nSize + 1) / 2)
1039 int i = std::min(nIndex^1, nSize-1);
1040 vMerkleBranch.push_back(vMerkleTree[j+i]);
1044 return vMerkleBranch;
1047 static uint256 CheckMerkleBranch(uint256 hash, const std::vector<uint256>& vMerkleBranch, int nIndex)
1051 BOOST_FOREACH(const uint256& otherside, vMerkleBranch)
1054 hash = Hash(BEGIN(otherside), END(otherside), BEGIN(hash), END(hash));
1056 hash = Hash(BEGIN(hash), END(hash), BEGIN(otherside), END(otherside));
1063 bool WriteToDisk(unsigned int& nFileRet, unsigned int& nBlockPosRet)
1065 // Open history file to append
1066 CAutoFile fileout = CAutoFile(AppendBlockFile(nFileRet), SER_DISK, CLIENT_VERSION);
1068 return error("CBlock::WriteToDisk() : AppendBlockFile failed");
1070 // Write index header
1071 unsigned int nSize = fileout.GetSerializeSize(*this);
1072 fileout << FLATDATA(pchMessageStart) << nSize;
1075 long fileOutPos = ftell(fileout);
1077 return error("CBlock::WriteToDisk() : ftell failed");
1078 nBlockPosRet = fileOutPos;
1081 // Flush stdio buffers and commit to disk before returning
1083 if (!IsInitialBlockDownload() || (nBestHeight+1) % 500 == 0)
1084 FileCommit(fileout);
1089 bool ReadFromDisk(unsigned int nFile, unsigned int nBlockPos, bool fReadTransactions=true)
1093 // Open history file to read
1094 CAutoFile filein = CAutoFile(OpenBlockFile(nFile, nBlockPos, "rb"), SER_DISK, CLIENT_VERSION);
1096 return error("CBlock::ReadFromDisk() : OpenBlockFile failed");
1097 if (!fReadTransactions)
1098 filein.nType |= SER_BLOCKHEADERONLY;
1104 catch (std::exception &e) {
1106 return error("%s() : deserialize or I/O error", BOOST_CURRENT_FUNCTION);
1110 if (fReadTransactions && IsProofOfWork() && !CheckProofOfWork(GetHash(), nBits))
1111 return error("CBlock::ReadFromDisk() : errors in block header");
1120 printf("CBlock(hash=%s, ver=%d, hashPrevBlock=%s, hashMerkleRoot=%s, nTime=%u, nBits=%08x, nNonce=%u, vtx=%" PRIszu ", vchBlockSig=%s)\n",
1121 GetHash().ToString().c_str(),
1123 hashPrevBlock.ToString().c_str(),
1124 hashMerkleRoot.ToString().c_str(),
1125 nTime, nBits, nNonce,
1127 HexStr(vchBlockSig.begin(), vchBlockSig.end()).c_str());
1128 for (unsigned int i = 0; i < vtx.size(); i++)
1133 printf(" vMerkleTree: ");
1134 for (unsigned int i = 0; i < vMerkleTree.size(); i++)
1135 printf("%s ", vMerkleTree[i].ToString().substr(0,10).c_str());
1140 bool DisconnectBlock(CTxDB& txdb, CBlockIndex* pindex);
1141 bool ConnectBlock(CTxDB& txdb, CBlockIndex* pindex, bool fJustCheck=false);
1142 bool ReadFromDisk(const CBlockIndex* pindex, bool fReadTransactions=true);
1143 bool SetBestChain(CTxDB& txdb, CBlockIndex* pindexNew);
1144 bool AddToBlockIndex(unsigned int nFile, unsigned int nBlockPos);
1145 bool CheckBlock(bool fCheckPOW=true, bool fCheckMerkleRoot=true, bool fCheckSig=true) const;
1147 bool GetCoinAge(uint64_t& nCoinAge) const; // ppcoin: calculate total coin age spent in block
1148 bool SignBlock(CWallet& keystore);
1149 bool CheckBlockSignature(bool fProofOfStake) const;
1152 bool SetBestChainInner(CTxDB& txdb, CBlockIndex *pindexNew);
1160 /** The block chain is a tree shaped structure starting with the
1161 * genesis block at the root, with each block potentially having multiple
1162 * candidates to be the next block. pprev and pnext link a path through the
1163 * main/longest chain. A blockindex may have multiple pprev pointing back
1164 * to it, but pnext will only point forward to the longest branch, or will
1165 * be null if the block is not part of the longest chain.
1170 const uint256* phashBlock;
1175 uint256 nChainTrust; // ppcoin: trust score of block chain
1179 int64_t nMoneySupply;
1181 uint32_t nFlags; // ppcoin: block index flags
1184 BLOCK_PROOF_OF_STAKE = (1 << 0), // is proof-of-stake block
1185 BLOCK_STAKE_ENTROPY = (1 << 1), // entropy bit for stake modifier
1186 BLOCK_STAKE_MODIFIER = (1 << 2), // regenerated stake modifier
1189 uint64_t nStakeModifier; // hash modifier for proof-of-stake
1190 uint32_t nStakeModifierChecksum; // checksum of index; in-memeory only
1192 // proof-of-stake specific fields
1193 COutPoint prevoutStake;
1194 uint32_t nStakeTime;
1195 uint256 hashProofOfStake;
1199 uint256 hashMerkleRoot;
1217 nStakeModifierChecksum = 0;
1218 hashProofOfStake = 0;
1219 prevoutStake.SetNull();
1229 CBlockIndex(unsigned int nFileIn, unsigned int nBlockPosIn, CBlock& block)
1235 nBlockPos = nBlockPosIn;
1242 nStakeModifierChecksum = 0;
1243 hashProofOfStake = 0;
1244 if (block.IsProofOfStake())
1247 prevoutStake = block.vtx[1].vin[0].prevout;
1248 nStakeTime = block.vtx[1].nTime;
1252 prevoutStake.SetNull();
1256 nVersion = block.nVersion;
1257 hashMerkleRoot = block.hashMerkleRoot;
1258 nTime = block.nTime;
1259 nBits = block.nBits;
1260 nNonce = block.nNonce;
1263 CBlock GetBlockHeader() const
1266 block.nVersion = nVersion;
1268 block.hashPrevBlock = pprev->GetBlockHash();
1269 block.hashMerkleRoot = hashMerkleRoot;
1270 block.nTime = nTime;
1271 block.nBits = nBits;
1272 block.nNonce = nNonce;
1276 uint256 GetBlockHash() const
1281 int64_t GetBlockTime() const
1283 return (int64_t)nTime;
1286 uint256 GetBlockTrust() const;
1288 bool IsInMainChain() const
1290 return (pnext || this == pindexBest);
1293 bool CheckIndex() const
1298 enum { nMedianTimeSpan=11 };
1300 int64_t GetMedianTimePast() const
1302 int64_t pmedian[nMedianTimeSpan];
1303 int64_t* pbegin = &pmedian[nMedianTimeSpan];
1304 int64_t* pend = &pmedian[nMedianTimeSpan];
1306 const CBlockIndex* pindex = this;
1307 for (int i = 0; i < nMedianTimeSpan && pindex; i++, pindex = pindex->pprev)
1308 *(--pbegin) = pindex->GetBlockTime();
1310 std::sort(pbegin, pend);
1311 return pbegin[(pend - pbegin)/2];
1314 int64_t GetMedianTime() const
1316 const CBlockIndex* pindex = this;
1317 for (int i = 0; i < nMedianTimeSpan/2; i++)
1320 return GetBlockTime();
1321 pindex = pindex->pnext;
1323 return pindex->GetMedianTimePast();
1327 * Returns true if there are nRequired or more blocks of minVersion or above
1328 * in the last nToCheck blocks, starting at pstart and going backwards.
1330 static bool IsSuperMajority(int minVersion, const CBlockIndex* pstart,
1331 unsigned int nRequired, unsigned int nToCheck);
1334 bool IsProofOfWork() const
1336 return !(nFlags & BLOCK_PROOF_OF_STAKE);
1339 bool IsProofOfStake() const
1341 return (nFlags & BLOCK_PROOF_OF_STAKE);
1344 void SetProofOfStake()
1346 nFlags |= BLOCK_PROOF_OF_STAKE;
1349 unsigned int GetStakeEntropyBit() const
1351 return ((nFlags & BLOCK_STAKE_ENTROPY) >> 1);
1354 bool SetStakeEntropyBit(unsigned int nEntropyBit)
1356 if (nEntropyBit > 1)
1358 nFlags |= (nEntropyBit? BLOCK_STAKE_ENTROPY : 0);
1362 bool GeneratedStakeModifier() const
1364 return (nFlags & BLOCK_STAKE_MODIFIER) != 0;
1367 void SetStakeModifier(uint64_t nModifier, bool fGeneratedStakeModifier)
1369 nStakeModifier = nModifier;
1370 if (fGeneratedStakeModifier)
1371 nFlags |= BLOCK_STAKE_MODIFIER;
1374 std::string ToString() const
1376 return strprintf("CBlockIndex(nprev=%p, pnext=%p, nFile=%u, nBlockPos=%-6d nHeight=%d, nMint=%s, nMoneySupply=%s, nFlags=(%s)(%d)(%s), nStakeModifier=%016" PRIx64 ", nStakeModifierChecksum=%08x, hashProofOfStake=%s, prevoutStake=(%s), nStakeTime=%d merkle=%s, hashBlock=%s)",
1377 pprev, pnext, nFile, nBlockPos, nHeight,
1378 FormatMoney(nMint).c_str(), FormatMoney(nMoneySupply).c_str(),
1379 GeneratedStakeModifier() ? "MOD" : "-", GetStakeEntropyBit(), IsProofOfStake()? "PoS" : "PoW",
1380 nStakeModifier, nStakeModifierChecksum,
1381 hashProofOfStake.ToString().c_str(),
1382 prevoutStake.ToString().c_str(), nStakeTime,
1383 hashMerkleRoot.ToString().c_str(),
1384 GetBlockHash().ToString().c_str());
1389 printf("%s\n", ToString().c_str());
1395 /** Used to marshal pointers into hashes for db storage. */
1396 class CDiskBlockIndex : public CBlockIndex
1412 explicit CDiskBlockIndex(CBlockIndex* pindex) : CBlockIndex(*pindex)
1414 hashPrev = (pprev ? pprev->GetBlockHash() : 0);
1415 hashNext = (pnext ? pnext->GetBlockHash() : 0);
1420 if (!(nType & SER_GETHASH))
1421 READWRITE(nVersion);
1423 READWRITE(hashNext);
1425 READWRITE(nBlockPos);
1428 READWRITE(nMoneySupply);
1430 READWRITE(nStakeModifier);
1431 if (IsProofOfStake())
1433 READWRITE(prevoutStake);
1434 READWRITE(nStakeTime);
1435 READWRITE(hashProofOfStake);
1439 const_cast<CDiskBlockIndex*>(this)->prevoutStake.SetNull();
1440 const_cast<CDiskBlockIndex*>(this)->nStakeTime = 0;
1441 const_cast<CDiskBlockIndex*>(this)->hashProofOfStake = 0;
1445 READWRITE(this->nVersion);
1446 READWRITE(hashPrev);
1447 READWRITE(hashMerkleRoot);
1451 READWRITE(blockHash);
1454 uint256 GetBlockHash() const
1456 if (fUseFastIndex && (nTime < GetAdjustedTime() - 24 * 60 * 60) && blockHash != 0)
1460 block.nVersion = nVersion;
1461 block.hashPrevBlock = hashPrev;
1462 block.hashMerkleRoot = hashMerkleRoot;
1463 block.nTime = nTime;
1464 block.nBits = nBits;
1465 block.nNonce = nNonce;
1467 const_cast<CDiskBlockIndex*>(this)->blockHash = block.GetHash();
1472 std::string ToString() const
1474 std::string str = "CDiskBlockIndex(";
1475 str += CBlockIndex::ToString();
1476 str += strprintf("\n hashBlock=%s, hashPrev=%s, hashNext=%s)",
1477 GetBlockHash().ToString().c_str(),
1478 hashPrev.ToString().c_str(),
1479 hashNext.ToString().c_str());
1485 printf("%s\n", ToString().c_str());
1496 /** Describes a place in the block chain to another node such that if the
1497 * other node doesn't have the same branch, it can find a recent common trunk.
1498 * The further back it is, the further before the fork it may be.
1503 std::vector<uint256> vHave;
1510 explicit CBlockLocator(const CBlockIndex* pindex)
1515 explicit CBlockLocator(uint256 hashBlock)
1517 std::map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
1518 if (mi != mapBlockIndex.end())
1522 CBlockLocator(const std::vector<uint256>& vHaveIn)
1529 if (!(nType & SER_GETHASH))
1530 READWRITE(nVersion);
1541 return vHave.empty();
1544 void Set(const CBlockIndex* pindex)
1550 vHave.push_back(pindex->GetBlockHash());
1552 // Exponentially larger steps back
1553 for (int i = 0; pindex && i < nStep; i++)
1554 pindex = pindex->pprev;
1555 if (vHave.size() > 10)
1558 vHave.push_back((!fTestNet ? hashGenesisBlock : hashGenesisBlockTestNet));
1561 int GetDistanceBack()
1563 // Retrace how far back it was in the sender's branch
1566 BOOST_FOREACH(const uint256& hash, vHave)
1568 std::map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hash);
1569 if (mi != mapBlockIndex.end())
1571 CBlockIndex* pindex = (*mi).second;
1572 if (pindex->IsInMainChain())
1582 CBlockIndex* GetBlockIndex()
1584 // Find the first block the caller has in the main chain
1585 BOOST_FOREACH(const uint256& hash, vHave)
1587 std::map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hash);
1588 if (mi != mapBlockIndex.end())
1590 CBlockIndex* pindex = (*mi).second;
1591 if (pindex->IsInMainChain())
1595 return pindexGenesisBlock;
1598 uint256 GetBlockHash()
1600 // Find the first block the caller has in the main chain
1601 BOOST_FOREACH(const uint256& hash, vHave)
1603 std::map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hash);
1604 if (mi != mapBlockIndex.end())
1606 CBlockIndex* pindex = (*mi).second;
1607 if (pindex->IsInMainChain())
1611 return (!fTestNet ? hashGenesisBlock : hashGenesisBlockTestNet);
1616 CBlockIndex* pindex = GetBlockIndex();
1619 return pindex->nHeight;
1633 mutable CCriticalSection cs;
1634 std::map<uint256, CTransaction> mapTx;
1635 std::map<COutPoint, CInPoint> mapNextTx;
1637 bool accept(CTxDB& txdb, CTransaction &tx,
1638 bool fCheckInputs, bool* pfMissingInputs);
1639 bool addUnchecked(const uint256& hash, CTransaction &tx);
1640 bool remove(CTransaction &tx);
1642 void queryHashes(std::vector<uint256>& vtxid);
1647 return mapTx.size();
1650 bool exists(uint256 hash)
1652 return (mapTx.count(hash) != 0);
1655 CTransaction& lookup(uint256 hash)
1661 extern CTxMemPool mempool;