1 // Copyright (c) 2009-2010 Satoshi Nakamoto
2 // Distributed under the MIT/X11 software license, see the accompanying
3 // file license.txt or http://www.opensource.org/licenses/mit-license.php.
17 static const unsigned int MAX_BLOCK_SIZE = 1000000;
18 static const unsigned int MAX_BLOCK_SIZE_GEN = MAX_BLOCK_SIZE/2;
19 static const int MAX_BLOCK_SIGOPS = MAX_BLOCK_SIZE/50;
20 static const int64 COIN = 100000000;
21 static const int64 CENT = 1000000;
22 static const int64 MAX_MONEY = 21000000 * COIN;
23 inline bool MoneyRange(int64 nValue) { return (nValue >= 0 && nValue <= MAX_MONEY); }
24 static const int COINBASE_MATURITY = 100;
31 extern CCriticalSection cs_main;
32 extern map<uint256, CBlockIndex*> mapBlockIndex;
33 extern uint256 hashGenesisBlock;
34 extern CBigNum bnProofOfWorkLimit;
35 extern CBlockIndex* pindexGenesisBlock;
36 extern int nBestHeight;
37 extern CBigNum bnBestChainWork;
38 extern CBigNum bnBestInvalidWork;
39 extern uint256 hashBestChain;
40 extern CBlockIndex* pindexBest;
41 extern unsigned int nTransactionsUpdated;
42 extern map<uint256, int> mapRequestCount;
43 extern CCriticalSection cs_mapRequestCount;
44 extern map<string, string> mapAddressBook;
45 extern CCriticalSection cs_mapAddressBook;
46 extern vector<unsigned char> vchDefaultKey;
47 extern double dHashesPerSec;
48 extern int64 nHPSTimerStart;
51 extern int fGenerateBitcoins;
52 extern int64 nTransactionFee;
53 extern CAddress addrIncoming;
54 extern int fLimitProcessors;
55 extern int nLimitProcessors;
56 extern int fMinimizeToTray;
57 extern int fMinimizeOnClose;
65 bool CheckDiskSpace(uint64 nAdditionalBytes=0);
66 FILE* OpenBlockFile(unsigned int nFile, unsigned int nBlockPos, const char* pszMode="rb");
67 FILE* AppendBlockFile(unsigned int& nFileRet);
68 bool AddKey(const CKey& key);
69 vector<unsigned char> GenerateNewKey();
70 bool AddToWallet(const CWalletTx& wtxIn);
71 void WalletUpdateSpent(const COutPoint& prevout);
72 int ScanForWalletTransactions(CBlockIndex* pindexStart);
73 void ReacceptWalletTransactions();
74 bool LoadBlockIndex(bool fAllowNew=true);
75 void PrintBlockTree();
76 bool ProcessMessages(CNode* pfrom);
77 bool ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv);
78 bool SendMessages(CNode* pto, bool fSendTrickle);
80 bool CreateTransaction(CScript scriptPubKey, int64 nValue, CWalletTx& wtxNew, CReserveKey& reservekey, int64& nFeeRet);
81 bool CommitTransaction(CWalletTx& wtxNew, CReserveKey& reservekey);
82 bool BroadcastTransaction(CWalletTx& wtxNew);
83 string SendMoney(CScript scriptPubKey, int64 nValue, CWalletTx& wtxNew, bool fAskFee=false);
84 string SendMoneyToBitcoinAddress(string strAddress, int64 nValue, CWalletTx& wtxNew, bool fAskFee=false);
85 void GenerateBitcoins(bool fGenerate);
86 void ThreadBitcoinMiner(void* parg);
87 CBlock* CreateNewBlock(CReserveKey& reservekey);
88 void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int& nExtraNonce, int64& nPrevTime);
89 void FormatHashBuffers(CBlock* pblock, char* pmidstate, char* pdata, char* phash1);
90 bool CheckWork(CBlock* pblock, CReserveKey& reservekey);
92 bool CheckProofOfWork(uint256 hash, unsigned int nBits);
93 bool IsInitialBlockDownload();
94 string GetWarnings(string strFor);
111 unsigned int nBlockPos;
119 CDiskTxPos(unsigned int nFileIn, unsigned int nBlockPosIn, unsigned int nTxPosIn)
122 nBlockPos = nBlockPosIn;
126 IMPLEMENT_SERIALIZE( READWRITE(FLATDATA(*this)); )
127 void SetNull() { nFile = -1; nBlockPos = 0; nTxPos = 0; }
128 bool IsNull() const { return (nFile == -1); }
130 friend bool operator==(const CDiskTxPos& a, const CDiskTxPos& b)
132 return (a.nFile == b.nFile &&
133 a.nBlockPos == b.nBlockPos &&
134 a.nTxPos == b.nTxPos);
137 friend bool operator!=(const CDiskTxPos& a, const CDiskTxPos& b)
142 string ToString() const
145 return strprintf("null");
147 return strprintf("(nFile=%d, nBlockPos=%d, nTxPos=%d)", nFile, nBlockPos, nTxPos);
152 printf("%s", ToString().c_str());
165 CInPoint() { SetNull(); }
166 CInPoint(CTransaction* ptxIn, unsigned int nIn) { ptx = ptxIn; n = nIn; }
167 void SetNull() { ptx = NULL; n = -1; }
168 bool IsNull() const { return (ptx == NULL && n == -1); }
180 COutPoint() { SetNull(); }
181 COutPoint(uint256 hashIn, unsigned int nIn) { hash = hashIn; n = nIn; }
182 IMPLEMENT_SERIALIZE( READWRITE(FLATDATA(*this)); )
183 void SetNull() { hash = 0; n = -1; }
184 bool IsNull() const { return (hash == 0 && n == -1); }
186 friend bool operator<(const COutPoint& a, const COutPoint& b)
188 return (a.hash < b.hash || (a.hash == b.hash && a.n < b.n));
191 friend bool operator==(const COutPoint& a, const COutPoint& b)
193 return (a.hash == b.hash && a.n == b.n);
196 friend bool operator!=(const COutPoint& a, const COutPoint& b)
201 string ToString() const
203 return strprintf("COutPoint(%s, %d)", hash.ToString().substr(0,10).c_str(), n);
208 printf("%s\n", ToString().c_str());
216 // An input of a transaction. It contains the location of the previous
217 // transaction's output that it claims and a signature that matches the
218 // output's public key.
225 unsigned int nSequence;
229 nSequence = UINT_MAX;
232 explicit CTxIn(COutPoint prevoutIn, CScript scriptSigIn=CScript(), unsigned int nSequenceIn=UINT_MAX)
235 scriptSig = scriptSigIn;
236 nSequence = nSequenceIn;
239 CTxIn(uint256 hashPrevTx, unsigned int nOut, CScript scriptSigIn=CScript(), unsigned int nSequenceIn=UINT_MAX)
241 prevout = COutPoint(hashPrevTx, nOut);
242 scriptSig = scriptSigIn;
243 nSequence = nSequenceIn;
249 READWRITE(scriptSig);
250 READWRITE(nSequence);
255 return (nSequence == UINT_MAX);
258 friend bool operator==(const CTxIn& a, const CTxIn& b)
260 return (a.prevout == b.prevout &&
261 a.scriptSig == b.scriptSig &&
262 a.nSequence == b.nSequence);
265 friend bool operator!=(const CTxIn& a, const CTxIn& b)
270 string ToString() const
273 str += strprintf("CTxIn(");
274 str += prevout.ToString();
275 if (prevout.IsNull())
276 str += strprintf(", coinbase %s", HexStr(scriptSig).c_str());
278 str += strprintf(", scriptSig=%s", scriptSig.ToString().substr(0,24).c_str());
279 if (nSequence != UINT_MAX)
280 str += strprintf(", nSequence=%u", nSequence);
287 printf("%s\n", ToString().c_str());
291 int64 GetDebit() const;
298 // An output of a transaction. It contains the public key that the next input
299 // must be able to sign with to claim it.
305 CScript scriptPubKey;
312 CTxOut(int64 nValueIn, CScript scriptPubKeyIn)
315 scriptPubKey = scriptPubKeyIn;
321 READWRITE(scriptPubKey);
327 scriptPubKey.clear();
332 return (nValue == -1);
335 uint256 GetHash() const
337 return SerializeHash(*this);
342 return ::IsMine(scriptPubKey);
345 int64 GetCredit() const
347 if (!MoneyRange(nValue))
348 throw runtime_error("CTxOut::GetCredit() : value out of range");
349 return (IsMine() ? nValue : 0);
352 bool IsChange() const
354 // On a debit transaction, a txout that's mine but isn't in the address book is change
355 vector<unsigned char> vchPubKey;
356 if (ExtractPubKey(scriptPubKey, true, vchPubKey))
357 CRITICAL_BLOCK(cs_mapAddressBook)
358 if (!mapAddressBook.count(PubKeyToAddress(vchPubKey)))
363 int64 GetChange() const
365 if (!MoneyRange(nValue))
366 throw runtime_error("CTxOut::GetChange() : value out of range");
367 return (IsChange() ? nValue : 0);
370 friend bool operator==(const CTxOut& a, const CTxOut& b)
372 return (a.nValue == b.nValue &&
373 a.scriptPubKey == b.scriptPubKey);
376 friend bool operator!=(const CTxOut& a, const CTxOut& b)
381 string ToString() const
383 if (scriptPubKey.size() < 6)
384 return "CTxOut(error)";
385 return strprintf("CTxOut(nValue=%"PRI64d".%08"PRI64d", scriptPubKey=%s)", nValue / COIN, nValue % COIN, scriptPubKey.ToString().substr(0,30).c_str());
390 printf("%s\n", ToString().c_str());
398 // The basic transaction that is broadcasted on the network and contained in
399 // blocks. A transaction can contain multiple inputs and outputs.
407 unsigned int nLockTime;
417 READWRITE(this->nVersion);
418 nVersion = this->nVersion;
421 READWRITE(nLockTime);
434 return (vin.empty() && vout.empty());
437 uint256 GetHash() const
439 return SerializeHash(*this);
442 bool IsFinal(int nBlockHeight=0, int64 nBlockTime=0) const
444 // Time based nLockTime implemented in 0.1.6
447 if (nBlockHeight == 0)
448 nBlockHeight = nBestHeight;
450 nBlockTime = GetAdjustedTime();
451 if ((int64)nLockTime < (nLockTime < 500000000 ? (int64)nBlockHeight : nBlockTime))
453 foreach(const CTxIn& txin, vin)
459 bool IsNewerThan(const CTransaction& old) const
461 if (vin.size() != old.vin.size())
463 for (int i = 0; i < vin.size(); i++)
464 if (vin[i].prevout != old.vin[i].prevout)
468 unsigned int nLowest = UINT_MAX;
469 for (int i = 0; i < vin.size(); i++)
471 if (vin[i].nSequence != old.vin[i].nSequence)
473 if (vin[i].nSequence <= nLowest)
476 nLowest = vin[i].nSequence;
478 if (old.vin[i].nSequence < nLowest)
481 nLowest = old.vin[i].nSequence;
488 bool IsCoinBase() const
490 return (vin.size() == 1 && vin[0].prevout.IsNull());
493 int GetSigOpCount() const
496 foreach(const CTxIn& txin, vin)
497 n += txin.scriptSig.GetSigOpCount();
498 foreach(const CTxOut& txout, vout)
499 n += txout.scriptPubKey.GetSigOpCount();
503 bool IsStandard() const
505 foreach(const CTxIn& txin, vin)
506 if (!txin.scriptSig.IsPushOnly())
507 return error("nonstandard txin: %s", txin.scriptSig.ToString().c_str());
508 foreach(const CTxOut& txout, vout)
509 if (!::IsStandard(txout.scriptPubKey))
510 return error("nonstandard txout: %s", txout.scriptPubKey.ToString().c_str());
516 foreach(const CTxOut& txout, vout)
522 bool IsFromMe() const
524 return (GetDebit() > 0);
527 int64 GetDebit() const
530 foreach(const CTxIn& txin, vin)
532 nDebit += txin.GetDebit();
533 if (!MoneyRange(nDebit))
534 throw runtime_error("CTransaction::GetDebit() : value out of range");
539 int64 GetCredit() const
542 foreach(const CTxOut& txout, vout)
544 nCredit += txout.GetCredit();
545 if (!MoneyRange(nCredit))
546 throw runtime_error("CTransaction::GetCredit() : value out of range");
551 int64 GetChange() const
556 foreach(const CTxOut& txout, vout)
558 nChange += txout.GetChange();
559 if (!MoneyRange(nChange))
560 throw runtime_error("CTransaction::GetChange() : value out of range");
565 int64 GetValueOut() const
568 foreach(const CTxOut& txout, vout)
570 nValueOut += txout.nValue;
571 if (!MoneyRange(txout.nValue) || !MoneyRange(nValueOut))
572 throw runtime_error("CTransaction::GetValueOut() : value out of range");
577 int64 GetMinFee(unsigned int nBlockSize=1, bool fAllowFree=true) const
579 // Base fee is 1 cent per kilobyte
580 unsigned int nBytes = ::GetSerializeSize(*this, SER_NETWORK);
581 unsigned int nNewBlockSize = nBlockSize + nBytes;
582 int64 nMinFee = (1 + (int64)nBytes / 1000) * CENT;
588 // Transactions under 10K are free
589 // (about 4500bc if made of 50bc inputs)
595 // Free transaction area
596 if (nNewBlockSize < 27000)
601 // To limit dust spam, require a 0.01 fee if any output is less than 0.01
603 foreach(const CTxOut& txout, vout)
604 if (txout.nValue < CENT)
607 // Raise the price as the block approaches full
608 if (nBlockSize != 1 && nNewBlockSize >= MAX_BLOCK_SIZE_GEN/2)
610 if (nNewBlockSize >= MAX_BLOCK_SIZE_GEN)
612 nMinFee *= MAX_BLOCK_SIZE_GEN / (MAX_BLOCK_SIZE_GEN - nNewBlockSize);
615 if (!MoneyRange(nMinFee))
621 bool ReadFromDisk(CDiskTxPos pos, FILE** pfileRet=NULL)
623 CAutoFile filein = OpenBlockFile(pos.nFile, 0, pfileRet ? "rb+" : "rb");
625 return error("CTransaction::ReadFromDisk() : OpenBlockFile failed");
628 if (fseek(filein, pos.nTxPos, SEEK_SET) != 0)
629 return error("CTransaction::ReadFromDisk() : fseek failed");
632 // Return file pointer
635 if (fseek(filein, pos.nTxPos, SEEK_SET) != 0)
636 return error("CTransaction::ReadFromDisk() : second fseek failed");
637 *pfileRet = filein.release();
642 friend bool operator==(const CTransaction& a, const CTransaction& b)
644 return (a.nVersion == b.nVersion &&
647 a.nLockTime == b.nLockTime);
650 friend bool operator!=(const CTransaction& a, const CTransaction& b)
656 string ToString() const
659 str += strprintf("CTransaction(hash=%s, ver=%d, vin.size=%d, vout.size=%d, nLockTime=%d)\n",
660 GetHash().ToString().substr(0,10).c_str(),
665 for (int i = 0; i < vin.size(); i++)
666 str += " " + vin[i].ToString() + "\n";
667 for (int i = 0; i < vout.size(); i++)
668 str += " " + vout[i].ToString() + "\n";
674 printf("%s", ToString().c_str());
678 bool ReadFromDisk(CTxDB& txdb, COutPoint prevout, CTxIndex& txindexRet);
679 bool ReadFromDisk(CTxDB& txdb, COutPoint prevout);
680 bool ReadFromDisk(COutPoint prevout);
681 bool DisconnectInputs(CTxDB& txdb);
682 bool ConnectInputs(CTxDB& txdb, map<uint256, CTxIndex>& mapTestPool, CDiskTxPos posThisTx,
683 CBlockIndex* pindexBlock, int64& nFees, bool fBlock, bool fMiner, int64 nMinFee=0);
684 bool ClientConnectInputs();
685 bool CheckTransaction() const;
686 bool AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs=true, bool* pfMissingInputs=NULL);
687 bool AcceptToMemoryPool(bool fCheckInputs=true, bool* pfMissingInputs=NULL)
690 return AcceptToMemoryPool(txdb, fCheckInputs, pfMissingInputs);
693 bool AddToMemoryPoolUnchecked();
695 bool RemoveFromMemoryPool();
703 // A transaction with a merkle branch linking it to the block chain
705 class CMerkleTx : public CTransaction
709 vector<uint256> vMerkleBranch;
713 mutable char fMerkleVerified;
721 CMerkleTx(const CTransaction& txIn) : CTransaction(txIn)
730 fMerkleVerified = false;
735 nSerSize += SerReadWrite(s, *(CTransaction*)this, nType, nVersion, ser_action);
736 nVersion = this->nVersion;
737 READWRITE(hashBlock);
738 READWRITE(vMerkleBranch);
743 int SetMerkleBranch(const CBlock* pblock=NULL);
744 int GetDepthInMainChain(int& nHeightRet) const;
745 int GetDepthInMainChain() const { int nHeight; return GetDepthInMainChain(nHeight); }
746 bool IsInMainChain() const { return GetDepthInMainChain() > 0; }
747 int GetBlocksToMaturity() const;
748 bool AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs=true);
749 bool AcceptToMemoryPool() { CTxDB txdb("r"); return AcceptToMemoryPool(txdb); }
756 // A transaction with a bunch of additional info that only the owner cares
757 // about. It includes any unrecorded transactions needed to link it back
758 // to the block chain.
760 class CWalletTx : public CMerkleTx
763 vector<CMerkleTx> vtxPrev;
764 map<string, string> mapValue;
765 vector<pair<string, string> > vOrderForm;
766 unsigned int fTimeReceivedIsTxTime;
767 unsigned int nTimeReceived; // time received by this node
770 string strFromAccount;
773 mutable char fDebitCached;
774 mutable char fCreditCached;
775 mutable char fChangeCached;
776 mutable int64 nDebitCached;
777 mutable int64 nCreditCached;
778 mutable int64 nChangeCached;
780 // memory only UI hints
781 mutable unsigned int nTimeDisplayed;
782 mutable int nLinesDisplayed;
783 mutable char fConfirmedDisplayed;
791 CWalletTx(const CMerkleTx& txIn) : CMerkleTx(txIn)
796 CWalletTx(const CTransaction& txIn) : CMerkleTx(txIn)
806 fTimeReceivedIsTxTime = false;
810 strFromAccount.clear();
811 fDebitCached = false;
812 fCreditCached = false;
813 fChangeCached = false;
819 fConfirmedDisplayed = false;
824 CWalletTx* pthis = const_cast<CWalletTx*>(this);
827 nSerSize += SerReadWrite(s, *(CMerkleTx*)this, nType, nVersion, ser_action);
830 pthis->mapValue["fromaccount"] = pthis->strFromAccount;
832 pthis->strFromAccount = pthis->mapValue["fromaccount"];
833 pthis->mapValue.erase("fromaccount");
834 pthis->mapValue.erase("version");
836 READWRITE(vOrderForm);
837 READWRITE(fTimeReceivedIsTxTime);
838 READWRITE(nTimeReceived);
843 int64 GetDebit() const
849 nDebitCached = CTransaction::GetDebit();
854 int64 GetCredit(bool fUseCache=true) const
856 // Must wait until coinbase is safely deep enough in the chain before valuing it
857 if (IsCoinBase() && GetBlocksToMaturity() > 0)
860 // GetBalance can assume transactions in mapWallet won't change
861 if (fUseCache && fCreditCached)
862 return nCreditCached;
863 nCreditCached = CTransaction::GetCredit();
864 fCreditCached = true;
865 return nCreditCached;
868 int64 GetChange() const
871 return nChangeCached;
872 nChangeCached = CTransaction::GetChange();
873 fChangeCached = true;
874 return nChangeCached;
877 void GetAmounts(int64& nGenerated, list<pair<string /* address */, int64> >& listReceived,
878 list<pair<string /* address */, int64> >& listSent, int64& nFee, string& strSentAccount) const;
880 void GetAccountAmounts(const string& strAccount, int64& nGenerated, int64& nReceived,
881 int64& nSent, int64& nFee) const;
883 bool IsFromMe() const
885 return (GetDebit() > 0);
888 bool IsConfirmed() const
890 // Quick answer in most cases
893 if (GetDepthInMainChain() >= 1)
895 if (!IsFromMe()) // using wtx's cached debit
898 // If no confirmations but it's from us, we can still
899 // consider it confirmed if all dependencies are confirmed
900 map<uint256, const CMerkleTx*> mapPrev;
901 vector<const CMerkleTx*> vWorkQueue;
902 vWorkQueue.reserve(vtxPrev.size()+1);
903 vWorkQueue.push_back(this);
904 for (int i = 0; i < vWorkQueue.size(); i++)
906 const CMerkleTx* ptx = vWorkQueue[i];
910 if (ptx->GetDepthInMainChain() >= 1)
912 if (!ptx->IsFromMe())
916 foreach(const CMerkleTx& tx, vtxPrev)
917 mapPrev[tx.GetHash()] = &tx;
919 foreach(const CTxIn& txin, ptx->vin)
921 if (!mapPrev.count(txin.prevout.hash))
923 vWorkQueue.push_back(mapPrev[txin.prevout.hash]);
931 return CWalletDB().WriteTx(GetHash(), *this);
935 int64 GetTxTime() const;
936 int GetRequestCount() const;
938 void AddSupportingTransactions(CTxDB& txdb);
940 bool AcceptWalletTransaction(CTxDB& txdb, bool fCheckInputs=true);
941 bool AcceptWalletTransaction() { CTxDB txdb("r"); return AcceptWalletTransaction(txdb); }
943 void RelayWalletTransaction(CTxDB& txdb);
944 void RelayWalletTransaction() { CTxDB txdb("r"); RelayWalletTransaction(txdb); }
951 // A txdb record that contains the disk location of a transaction and the
952 // locations of transactions that spend its outputs. vSpent is really only
953 // used as a flag, but having the location is very helpful for debugging.
959 vector<CDiskTxPos> vSpent;
966 CTxIndex(const CDiskTxPos& posIn, unsigned int nOutputs)
969 vSpent.resize(nOutputs);
974 if (!(nType & SER_GETHASH))
991 friend bool operator==(const CTxIndex& a, const CTxIndex& b)
993 return (a.pos == b.pos &&
994 a.vSpent == b.vSpent);
997 friend bool operator!=(const CTxIndex& a, const CTxIndex& b)
1008 // Nodes collect new transactions into a block, hash them into a hash tree,
1009 // and scan through nonce values to make the block's hash satisfy proof-of-work
1010 // requirements. When they solve the proof-of-work, they broadcast the block
1011 // to everyone and the block is added to the block chain. The first transaction
1012 // in the block is a special one that creates a new coin owned by the creator
1015 // Blocks are appended to blk0001.dat files on disk. Their location on disk
1016 // is indexed by CBlockIndex objects in memory.
1023 uint256 hashPrevBlock;
1024 uint256 hashMerkleRoot;
1027 unsigned int nNonce;
1030 vector<CTransaction> vtx;
1033 mutable vector<uint256> vMerkleTree;
1043 READWRITE(this->nVersion);
1044 nVersion = this->nVersion;
1045 READWRITE(hashPrevBlock);
1046 READWRITE(hashMerkleRoot);
1051 // ConnectBlock depends on vtx being last so it can calculate offset
1052 if (!(nType & (SER_GETHASH|SER_BLOCKHEADERONLY)))
1055 const_cast<CBlock*>(this)->vtx.clear();
1067 vMerkleTree.clear();
1072 return (nBits == 0);
1075 uint256 GetHash() const
1077 return Hash(BEGIN(nVersion), END(nNonce));
1080 int64 GetBlockTime() const
1082 return (int64)nTime;
1085 int GetSigOpCount() const
1088 foreach(const CTransaction& tx, vtx)
1089 n += tx.GetSigOpCount();
1094 uint256 BuildMerkleTree() const
1096 vMerkleTree.clear();
1097 foreach(const CTransaction& tx, vtx)
1098 vMerkleTree.push_back(tx.GetHash());
1100 for (int nSize = vtx.size(); nSize > 1; nSize = (nSize + 1) / 2)
1102 for (int i = 0; i < nSize; i += 2)
1104 int i2 = min(i+1, nSize-1);
1105 vMerkleTree.push_back(Hash(BEGIN(vMerkleTree[j+i]), END(vMerkleTree[j+i]),
1106 BEGIN(vMerkleTree[j+i2]), END(vMerkleTree[j+i2])));
1110 return (vMerkleTree.empty() ? 0 : vMerkleTree.back());
1113 vector<uint256> GetMerkleBranch(int nIndex) const
1115 if (vMerkleTree.empty())
1117 vector<uint256> vMerkleBranch;
1119 for (int nSize = vtx.size(); nSize > 1; nSize = (nSize + 1) / 2)
1121 int i = min(nIndex^1, nSize-1);
1122 vMerkleBranch.push_back(vMerkleTree[j+i]);
1126 return vMerkleBranch;
1129 static uint256 CheckMerkleBranch(uint256 hash, const vector<uint256>& vMerkleBranch, int nIndex)
1133 foreach(const uint256& otherside, vMerkleBranch)
1136 hash = Hash(BEGIN(otherside), END(otherside), BEGIN(hash), END(hash));
1138 hash = Hash(BEGIN(hash), END(hash), BEGIN(otherside), END(otherside));
1145 bool WriteToDisk(unsigned int& nFileRet, unsigned int& nBlockPosRet)
1147 // Open history file to append
1148 CAutoFile fileout = AppendBlockFile(nFileRet);
1150 return error("CBlock::WriteToDisk() : AppendBlockFile failed");
1152 // Write index header
1153 unsigned int nSize = fileout.GetSerializeSize(*this);
1154 fileout << FLATDATA(pchMessageStart) << nSize;
1157 nBlockPosRet = ftell(fileout);
1158 if (nBlockPosRet == -1)
1159 return error("CBlock::WriteToDisk() : ftell failed");
1162 // Flush stdio buffers and commit to disk before returning
1164 if (!IsInitialBlockDownload() || (nBestHeight+1) % 500 == 0)
1167 _commit(_fileno(fileout));
1169 fsync(fileno(fileout));
1176 bool ReadFromDisk(unsigned int nFile, unsigned int nBlockPos, bool fReadTransactions=true)
1180 // Open history file to read
1181 CAutoFile filein = OpenBlockFile(nFile, nBlockPos, "rb");
1183 return error("CBlock::ReadFromDisk() : OpenBlockFile failed");
1184 if (!fReadTransactions)
1185 filein.nType |= SER_BLOCKHEADERONLY;
1191 if (!CheckProofOfWork(GetHash(), nBits))
1192 return error("CBlock::ReadFromDisk() : errors in block header");
1201 printf("CBlock(hash=%s, ver=%d, hashPrevBlock=%s, hashMerkleRoot=%s, nTime=%u, nBits=%08x, nNonce=%u, vtx=%d)\n",
1202 GetHash().ToString().substr(0,20).c_str(),
1204 hashPrevBlock.ToString().substr(0,20).c_str(),
1205 hashMerkleRoot.ToString().substr(0,10).c_str(),
1206 nTime, nBits, nNonce,
1208 for (int i = 0; i < vtx.size(); i++)
1213 printf(" vMerkleTree: ");
1214 for (int i = 0; i < vMerkleTree.size(); i++)
1215 printf("%s ", vMerkleTree[i].ToString().substr(0,10).c_str());
1220 bool DisconnectBlock(CTxDB& txdb, CBlockIndex* pindex);
1221 bool ConnectBlock(CTxDB& txdb, CBlockIndex* pindex);
1222 bool ReadFromDisk(const CBlockIndex* pindex, bool fReadTransactions=true);
1223 bool SetBestChain(CTxDB& txdb, CBlockIndex* pindexNew);
1224 bool AddToBlockIndex(unsigned int nFile, unsigned int nBlockPos);
1225 bool CheckBlock() const;
1235 // The block chain is a tree shaped structure starting with the
1236 // genesis block at the root, with each block potentially having multiple
1237 // candidates to be the next block. pprev and pnext link a path through the
1238 // main/longest chain. A blockindex may have multiple pprev pointing back
1239 // to it, but pnext will only point forward to the longest branch, or will
1240 // be null if the block is not part of the longest chain.
1245 const uint256* phashBlock;
1249 unsigned int nBlockPos;
1251 CBigNum bnChainWork;
1255 uint256 hashMerkleRoot;
1258 unsigned int nNonce;
1278 CBlockIndex(unsigned int nFileIn, unsigned int nBlockPosIn, CBlock& block)
1284 nBlockPos = nBlockPosIn;
1288 nVersion = block.nVersion;
1289 hashMerkleRoot = block.hashMerkleRoot;
1290 nTime = block.nTime;
1291 nBits = block.nBits;
1292 nNonce = block.nNonce;
1295 CBlock GetBlockHeader() const
1298 block.nVersion = nVersion;
1300 block.hashPrevBlock = pprev->GetBlockHash();
1301 block.hashMerkleRoot = hashMerkleRoot;
1302 block.nTime = nTime;
1303 block.nBits = nBits;
1304 block.nNonce = nNonce;
1308 uint256 GetBlockHash() const
1313 int64 GetBlockTime() const
1315 return (int64)nTime;
1318 CBigNum GetBlockWork() const
1321 bnTarget.SetCompact(nBits);
1324 return (CBigNum(1)<<256) / (bnTarget+1);
1327 bool IsInMainChain() const
1329 return (pnext || this == pindexBest);
1332 bool CheckIndex() const
1334 return CheckProofOfWork(GetBlockHash(), nBits);
1337 bool EraseBlockFromDisk()
1339 // Open history file
1340 CAutoFile fileout = OpenBlockFile(nFile, nBlockPos, "rb+");
1344 // Overwrite with empty null block
1352 enum { nMedianTimeSpan=11 };
1354 int64 GetMedianTimePast() const
1356 int64 pmedian[nMedianTimeSpan];
1357 int64* pbegin = &pmedian[nMedianTimeSpan];
1358 int64* pend = &pmedian[nMedianTimeSpan];
1360 const CBlockIndex* pindex = this;
1361 for (int i = 0; i < nMedianTimeSpan && pindex; i++, pindex = pindex->pprev)
1362 *(--pbegin) = pindex->GetBlockTime();
1365 return pbegin[(pend - pbegin)/2];
1368 int64 GetMedianTime() const
1370 const CBlockIndex* pindex = this;
1371 for (int i = 0; i < nMedianTimeSpan/2; i++)
1374 return GetBlockTime();
1375 pindex = pindex->pnext;
1377 return pindex->GetMedianTimePast();
1382 string ToString() const
1384 return strprintf("CBlockIndex(nprev=%08x, pnext=%08x, nFile=%d, nBlockPos=%-6d nHeight=%d, merkle=%s, hashBlock=%s)",
1385 pprev, pnext, nFile, nBlockPos, nHeight,
1386 hashMerkleRoot.ToString().substr(0,10).c_str(),
1387 GetBlockHash().ToString().substr(0,20).c_str());
1392 printf("%s\n", ToString().c_str());
1399 // Used to marshal pointers into hashes for db storage.
1401 class CDiskBlockIndex : public CBlockIndex
1413 explicit CDiskBlockIndex(CBlockIndex* pindex) : CBlockIndex(*pindex)
1415 hashPrev = (pprev ? pprev->GetBlockHash() : 0);
1416 hashNext = (pnext ? pnext->GetBlockHash() : 0);
1421 if (!(nType & SER_GETHASH))
1422 READWRITE(nVersion);
1424 READWRITE(hashNext);
1426 READWRITE(nBlockPos);
1430 READWRITE(this->nVersion);
1431 READWRITE(hashPrev);
1432 READWRITE(hashMerkleRoot);
1438 uint256 GetBlockHash() const
1441 block.nVersion = nVersion;
1442 block.hashPrevBlock = hashPrev;
1443 block.hashMerkleRoot = hashMerkleRoot;
1444 block.nTime = nTime;
1445 block.nBits = nBits;
1446 block.nNonce = nNonce;
1447 return block.GetHash();
1451 string ToString() const
1453 string str = "CDiskBlockIndex(";
1454 str += CBlockIndex::ToString();
1455 str += strprintf("\n hashBlock=%s, hashPrev=%s, hashNext=%s)",
1456 GetBlockHash().ToString().c_str(),
1457 hashPrev.ToString().substr(0,20).c_str(),
1458 hashNext.ToString().substr(0,20).c_str());
1464 printf("%s\n", ToString().c_str());
1476 // Describes a place in the block chain to another node such that if the
1477 // other node doesn't have the same branch, it can find a recent common trunk.
1478 // The further back it is, the further before the fork it may be.
1483 vector<uint256> vHave;
1490 explicit CBlockLocator(const CBlockIndex* pindex)
1495 explicit CBlockLocator(uint256 hashBlock)
1497 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
1498 if (mi != mapBlockIndex.end())
1504 if (!(nType & SER_GETHASH))
1505 READWRITE(nVersion);
1516 return vHave.empty();
1519 void Set(const CBlockIndex* pindex)
1525 vHave.push_back(pindex->GetBlockHash());
1527 // Exponentially larger steps back
1528 for (int i = 0; pindex && i < nStep; i++)
1529 pindex = pindex->pprev;
1530 if (vHave.size() > 10)
1533 vHave.push_back(hashGenesisBlock);
1536 int GetDistanceBack()
1538 // Retrace how far back it was in the sender's branch
1541 foreach(const uint256& hash, vHave)
1543 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hash);
1544 if (mi != mapBlockIndex.end())
1546 CBlockIndex* pindex = (*mi).second;
1547 if (pindex->IsInMainChain())
1557 CBlockIndex* GetBlockIndex()
1559 // Find the first block the caller has in the main chain
1560 foreach(const uint256& hash, vHave)
1562 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hash);
1563 if (mi != mapBlockIndex.end())
1565 CBlockIndex* pindex = (*mi).second;
1566 if (pindex->IsInMainChain())
1570 return pindexGenesisBlock;
1573 uint256 GetBlockHash()
1575 // Find the first block the caller has in the main chain
1576 foreach(const uint256& hash, vHave)
1578 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hash);
1579 if (mi != mapBlockIndex.end())
1581 CBlockIndex* pindex = (*mi).second;
1582 if (pindex->IsInMainChain())
1586 return hashGenesisBlock;
1591 CBlockIndex* pindex = GetBlockIndex();
1594 return pindex->nHeight;
1604 // Private key that includes an expiration date in case it never gets used.
1609 CPrivKey vchPrivKey;
1613 //// todo: add something to note what created it (user, getnewaddress, change)
1614 //// maybe should have a map<string, string> property map
1616 CWalletKey(int64 nExpires=0)
1618 nTimeCreated = (nExpires ? GetTime() : 0);
1619 nTimeExpires = nExpires;
1624 if (!(nType & SER_GETHASH))
1625 READWRITE(nVersion);
1626 READWRITE(vchPrivKey);
1627 READWRITE(nTimeCreated);
1628 READWRITE(nTimeExpires);
1629 READWRITE(strComment);
1639 // Account information.
1640 // Stored in wallet with key "acc"+string account name
1645 vector<unsigned char> vchPubKey;
1659 if (!(nType & SER_GETHASH))
1660 READWRITE(nVersion);
1661 READWRITE(vchPubKey);
1668 // Internal transfers.
1669 // Database key is acentry<account><counter>
1671 class CAccountingEntry
1677 string strOtherAccount;
1690 strOtherAccount.clear();
1696 if (!(nType & SER_GETHASH))
1697 READWRITE(nVersion);
1698 // Note: strAccount is serialized as part of the key, not here.
1699 READWRITE(nCreditDebit);
1701 READWRITE(strOtherAccount);
1702 READWRITE(strComment);
1715 // Alerts are for notifying old versions if they become too obsolete and
1716 // need to upgrade. The message is displayed in the status bar.
1717 // Alert messages are broadcast as a vector of signed data. Unserializing may
1718 // not read the entire buffer if the alert is for a newer version, but older
1719 // versions can still relay the original data.
1721 class CUnsignedAlert
1725 int64 nRelayUntil; // when newer nodes stop relaying to newer nodes
1730 int nMinVer; // lowest version inclusive
1731 int nMaxVer; // highest version inclusive
1732 set<string> setSubVer; // empty matches all
1737 string strStatusBar;
1742 READWRITE(this->nVersion);
1743 nVersion = this->nVersion;
1744 READWRITE(nRelayUntil);
1745 READWRITE(nExpiration);
1748 READWRITE(setCancel);
1751 READWRITE(setSubVer);
1752 READWRITE(nPriority);
1754 READWRITE(strComment);
1755 READWRITE(strStatusBar);
1756 READWRITE(strReserved);
1773 strStatusBar.clear();
1774 strReserved.clear();
1777 string ToString() const
1779 string strSetCancel;
1780 foreach(int n, setCancel)
1781 strSetCancel += strprintf("%d ", n);
1782 string strSetSubVer;
1783 foreach(string str, setSubVer)
1784 strSetSubVer += "\"" + str + "\" ";
1788 " nRelayUntil = %"PRI64d"\n"
1789 " nExpiration = %"PRI64d"\n"
1797 " strComment = \"%s\"\n"
1798 " strStatusBar = \"%s\"\n"
1805 strSetCancel.c_str(),
1808 strSetSubVer.c_str(),
1811 strStatusBar.c_str());
1816 printf("%s", ToString().c_str());
1820 class CAlert : public CUnsignedAlert
1823 vector<unsigned char> vchMsg;
1824 vector<unsigned char> vchSig;
1839 CUnsignedAlert::SetNull();
1846 return (nExpiration == 0);
1849 uint256 GetHash() const
1851 return SerializeHash(*this);
1854 bool IsInEffect() const
1856 return (GetAdjustedTime() < nExpiration);
1859 bool Cancels(const CAlert& alert) const
1862 return false; // this was a no-op before 31403
1863 return (alert.nID <= nCancel || setCancel.count(alert.nID));
1866 bool AppliesTo(int nVersion, string strSubVerIn) const
1868 return (IsInEffect() &&
1869 nMinVer <= nVersion && nVersion <= nMaxVer &&
1870 (setSubVer.empty() || setSubVer.count(strSubVerIn)));
1873 bool AppliesToMe() const
1875 return AppliesTo(VERSION, ::pszSubVer);
1878 bool RelayTo(CNode* pnode) const
1882 // returns true if wasn't already contained in the set
1883 if (pnode->setKnown.insert(GetHash()).second)
1885 if (AppliesTo(pnode->nVersion, pnode->strSubVer) ||
1887 GetAdjustedTime() < nRelayUntil)
1889 pnode->PushMessage("alert", *this);
1896 bool CheckSignature()
1899 if (!key.SetPubKey(ParseHex("04fc9702847840aaf195de8442ebecedf5b095cdbb9bc716bda9110971b28a49e0ead8564ff0db22209e0374782c093bb899692d524e9d6a6956e7c5ecbcd68284")))
1900 return error("CAlert::CheckSignature() : SetPubKey failed");
1901 if (!key.Verify(Hash(vchMsg.begin(), vchMsg.end()), vchSig))
1902 return error("CAlert::CheckSignature() : verify signature failed");
1904 // Now unserialize the data
1905 CDataStream sMsg(vchMsg);
1906 sMsg >> *(CUnsignedAlert*)this;
1910 bool ProcessAlert();
1922 extern map<uint256, CTransaction> mapTransactions;
1923 extern map<uint256, CWalletTx> mapWallet;
1924 extern vector<uint256> vWalletUpdated;
1925 extern CCriticalSection cs_mapWallet;
1926 extern map<vector<unsigned char>, CPrivKey> mapKeys;
1927 extern map<uint160, vector<unsigned char> > mapPubKeys;
1928 extern CCriticalSection cs_mapKeys;
1929 extern CKey keyUser;