text: // Copyright (c) 2009-2010 Satoshi Nakamoto
  // Copyright (c) 2009-2014 The Bitcoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include "wallet/wallet.h"
  
  #include "base58.h"
  #include "checkpoints.h"
  #include "chain.h"
  #include "coincontrol.h"
  #include "consensus/consensus.h"
  #include "consensus/validation.h"
  #include "key.h"
  #include "keystore.h"
  #include "main.h"
  #include "net.h"
  #include "policy/policy.h"
  #include "primitives/block.h"
  #include "primitives/transaction.h"
  #include "script/script.h"
  #include "script/sign.h"
  #include "timedata.h"
  #include "txmempool.h"
  #include "util.h"
  #include "utilmoneystr.h"
  
  #include <assert.h>
  
  #include <boost/algorithm/string/replace.hpp>
  #include <boost/filesystem.hpp>
  #include <boost/thread.hpp>
  
  using namespace std;
  
  /**
   * Settings
   */
  CFeeRate payTxFee(DEFAULT_TRANSACTION_FEE);
  CAmount maxTxFee = DEFAULT_TRANSACTION_MAXFEE;
  unsigned int nTxConfirmTarget = DEFAULT_TX_CONFIRM_TARGET;
  bool bSpendZeroConfChange = DEFAULT_SPEND_ZEROCONF_CHANGE;
  bool fSendFreeTransactions = DEFAULT_SEND_FREE_TRANSACTIONS;
  
  /**
   * Fees smaller than this (in satoshi) are considered zero fee (for transaction creation)
   * Override with -mintxfee
   */
  CFeeRate CWallet::minTxFee = CFeeRate(DEFAULT_TRANSACTION_MINFEE);
  
  /** @defgroup mapWallet
   *
   * @{
   */
  
  struct CompareValueOnly
  {
      bool operator()(const pair<CAmount, pair<const CWalletTx*, unsigned int> >& t1,
                      const pair<CAmount, pair<const CWalletTx*, unsigned int> >& t2) const
      {
          return t1.first < t2.first;
      }
  };
  
  std::string COutput::ToString() const
  {
      return strprintf("COutput(%s, %d, %d) [%s]", tx->GetHash().ToString(), i, nDepth, FormatMoney(tx->vout[i].nValue));
  }
  
  const CWalletTx* CWallet::GetWalletTx(const uint256& hash) const
  {
      LOCK(cs_wallet);
      std::map<uint256, CWalletTx>::const_iterator it = mapWallet.find(hash);
      if (it == mapWallet.end())
          return NULL;
      return &(it->second);
  }
  
  CPubKey CWallet::GenerateNewKey()
  {
      AssertLockHeld(cs_wallet); // mapKeyMetadata
      bool fCompressed = CanSupportFeature(FEATURE_COMPRPUBKEY); // default to compressed public keys if we want 0.6.0 wallets
  
      CKey secret;
      secret.MakeNewKey(fCompressed);
  
      // Compressed public keys were introduced in version 0.6.0
      if (fCompressed)
          SetMinVersion(FEATURE_COMPRPUBKEY);
  
      CPubKey pubkey = secret.GetPubKey();
      assert(secret.VerifyPubKey(pubkey));
  
      // Create new metadata
      int64_t nCreationTime = GetTime();
      mapKeyMetadata[pubkey.GetID()] = CKeyMetadata(nCreationTime);
      if (!nTimeFirstKey || nCreationTime < nTimeFirstKey)
          nTimeFirstKey = nCreationTime;
  
      if (!AddKeyPubKey(secret, pubkey))
          throw std::runtime_error("CWallet::GenerateNewKey(): AddKey failed");
      return pubkey;
  }
  
  bool CWallet::AddKeyPubKey(const CKey& secret, const CPubKey &pubkey)
  {
      AssertLockHeld(cs_wallet); // mapKeyMetadata
      if (!CCryptoKeyStore::AddKeyPubKey(secret, pubkey))
          return false;
  
      // check if we need to remove from watch-only
      CScript script;
      script = GetScriptForDestination(pubkey.GetID());
      if (HaveWatchOnly(script))
          RemoveWatchOnly(script);
      script = GetScriptForRawPubKey(pubkey);
      if (HaveWatchOnly(script))
          RemoveWatchOnly(script);
  
      if (!fFileBacked)
          return true;
      if (!IsCrypted()) {
          return CWalletDB(strWalletFile).WriteKey(pubkey,
                                                   secret.GetPrivKey(),
                                                   mapKeyMetadata[pubkey.GetID()]);
      }
      return true;
  }
  
  bool CWallet::AddCryptedKey(const CPubKey &vchPubKey,
                              const vector<unsigned char> &vchCryptedSecret)
  {
      if (!CCryptoKeyStore::AddCryptedKey(vchPubKey, vchCryptedSecret))
          return false;
      if (!fFileBacked)
          return true;
      {
          LOCK(cs_wallet);
          if (pwalletdbEncryption)
              return pwalletdbEncryption->WriteCryptedKey(vchPubKey,
                                                          vchCryptedSecret,
                                                          mapKeyMetadata[vchPubKey.GetID()]);
          else
              return CWalletDB(strWalletFile).WriteCryptedKey(vchPubKey,
                                                              vchCryptedSecret,
                                                              mapKeyMetadata[vchPubKey.GetID()]);
      }
      return false;
  }
  
  bool CWallet::LoadKeyMetadata(const CPubKey &pubkey, const CKeyMetadata &meta)
  {
      AssertLockHeld(cs_wallet); // mapKeyMetadata
      if (meta.nCreateTime && (!nTimeFirstKey || meta.nCreateTime < nTimeFirstKey))
          nTimeFirstKey = meta.nCreateTime;
  
      mapKeyMetadata[pubkey.GetID()] = meta;
      return true;
  }
  
  bool CWallet::LoadCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret)
  {
      return CCryptoKeyStore::AddCryptedKey(vchPubKey, vchCryptedSecret);
  }
  
  bool CWallet::AddCScript(const CScript& redeemScript)
  {
      if (!CCryptoKeyStore::AddCScript(redeemScript))
          return false;
      if (!fFileBacked)
          return true;
      return CWalletDB(strWalletFile).WriteCScript(Hash160(redeemScript), redeemScript);
  }
  
  bool CWallet::LoadCScript(const CScript& redeemScript)
  {
      /* A sanity check was added in pull #3843 to avoid adding redeemScripts
       * that never can be redeemed. However, old wallets may still contain
       * these. Do not add them to the wallet and warn. */
      if (redeemScript.size() > MAX_SCRIPT_ELEMENT_SIZE)
      {
          std::string strAddr = CBitcoinAddress(CScriptID(redeemScript)).ToString();
          LogPrintf("%s: Warning: This wallet contains a redeemScript of size %i which exceeds maximum size %i thus can never be redeemed. Do not use address %s.\n",
              __func__, redeemScript.size(), MAX_SCRIPT_ELEMENT_SIZE, strAddr);
          return true;
      }
  
      return CCryptoKeyStore::AddCScript(redeemScript);
  }
  
  bool CWallet::AddWatchOnly(const CScript &dest)
  {
      if (!CCryptoKeyStore::AddWatchOnly(dest))
          return false;
      nTimeFirstKey = 1; // No birthday information for watch-only keys.
      NotifyWatchonlyChanged(true);
      if (!fFileBacked)
          return true;
      return CWalletDB(strWalletFile).WriteWatchOnly(dest);
  }
  
  bool CWallet::RemoveWatchOnly(const CScript &dest)
  {
      AssertLockHeld(cs_wallet);
      if (!CCryptoKeyStore::RemoveWatchOnly(dest))
          return false;
      if (!HaveWatchOnly())
          NotifyWatchonlyChanged(false);
      if (fFileBacked)
          if (!CWalletDB(strWalletFile).EraseWatchOnly(dest))
              return false;
  
      return true;
  }
  
  bool CWallet::LoadWatchOnly(const CScript &dest)
  {
      return CCryptoKeyStore::AddWatchOnly(dest);
  }
  
  bool CWallet::Unlock(const SecureString& strWalletPassphrase)
  {
      CCrypter crypter;
      CKeyingMaterial vMasterKey;
  
      {
          LOCK(cs_wallet);
          BOOST_FOREACH(const MasterKeyMap::value_type& pMasterKey, mapMasterKeys)
          {
              if(!crypter.SetKeyFromPassphrase(strWalletPassphrase, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod))
                  return false;
              if (!crypter.Decrypt(pMasterKey.second.vchCryptedKey, vMasterKey))
                  continue; // try another master key
              if (CCryptoKeyStore::Unlock(vMasterKey))
                  return true;
          }
      }
      return false;
  }
  
  bool CWallet::ChangeWalletPassphrase(const SecureString& strOldWalletPassphrase, const SecureString& strNewWalletPassphrase)
  {
      bool fWasLocked = IsLocked();
  
      {
          LOCK(cs_wallet);
          Lock();
  
          CCrypter crypter;
          CKeyingMaterial vMasterKey;
          BOOST_FOREACH(MasterKeyMap::value_type& pMasterKey, mapMasterKeys)
          {
              if(!crypter.SetKeyFromPassphrase(strOldWalletPassphrase, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod))
                  return false;
              if (!crypter.Decrypt(pMasterKey.second.vchCryptedKey, vMasterKey))
                  return false;
              if (CCryptoKeyStore::Unlock(vMasterKey))
              {
                  int64_t nStartTime = GetTimeMillis();
                  crypter.SetKeyFromPassphrase(strNewWalletPassphrase, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod);
                  pMasterKey.second.nDeriveIterations = pMasterKey.second.nDeriveIterations * (100 / ((double)(GetTimeMillis() - nStartTime)));
  
                  nStartTime = GetTimeMillis();
                  crypter.SetKeyFromPassphrase(strNewWalletPassphrase, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod);
                  pMasterKey.second.nDeriveIterations = (pMasterKey.second.nDeriveIterations + pMasterKey.second.nDeriveIterations * 100 / ((double)(GetTimeMillis() - nStartTime))) / 2;
  
                  if (pMasterKey.second.nDeriveIterations < 25000)
                      pMasterKey.second.nDeriveIterations = 25000;
  
                  LogPrintf("Wallet passphrase changed to an nDeriveIterations of %i\n", pMasterKey.second.nDeriveIterations);
  
                  if (!crypter.SetKeyFromPassphrase(strNewWalletPassphrase, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod))
                      return false;
                  if (!crypter.Encrypt(vMasterKey, pMasterKey.second.vchCryptedKey))
                      return false;
                  CWalletDB(strWalletFile).WriteMasterKey(pMasterKey.first, pMasterKey.second);
                  if (fWasLocked)
                      Lock();
                  return true;
              }
          }
      }
  
      return false;
  }
  
  void CWallet::SetBestChain(const CBlockLocator& loc)
  {
      CWalletDB walletdb(strWalletFile);
      walletdb.WriteBestBlock(loc);
  }
  
  bool CWallet::SetMinVersion(enum WalletFeature nVersion, CWalletDB* pwalletdbIn, bool fExplicit)
  {
      LOCK(cs_wallet); // nWalletVersion
      if (nWalletVersion >= nVersion)
          return true;
  
      // when doing an explicit upgrade, if we pass the max version permitted, upgrade all the way
      if (fExplicit && nVersion > nWalletMaxVersion)
              nVersion = FEATURE_LATEST;
  
      nWalletVersion = nVersion;
  
      if (nVersion > nWalletMaxVersion)
          nWalletMaxVersion = nVersion;
  
      if (fFileBacked)
      {
          CWalletDB* pwalletdb = pwalletdbIn ? pwalletdbIn : new CWalletDB(strWalletFile);
          if (nWalletVersion > 40000)
              pwalletdb->WriteMinVersion(nWalletVersion);
          if (!pwalletdbIn)
              delete pwalletdb;
      }
  
      return true;
  }
  
  bool CWallet::SetMaxVersion(int nVersion)
  {
      LOCK(cs_wallet); // nWalletVersion, nWalletMaxVersion
      // cannot downgrade below current version
      if (nWalletVersion > nVersion)
          return false;
  
      nWalletMaxVersion = nVersion;
  
      return true;
  }
  
  set<uint256> CWallet::GetConflicts(const uint256& txid) const
  {
      set<uint256> result;
      AssertLockHeld(cs_wallet);
  
      std::map<uint256, CWalletTx>::const_iterator it = mapWallet.find(txid);
      if (it == mapWallet.end())
          return result;
      const CWalletTx& wtx = it->second;
  
      std::pair<TxSpends::const_iterator, TxSpends::const_iterator> range;
  
      BOOST_FOREACH(const CTxIn& txin, wtx.vin)
      {
          if (mapTxSpends.count(txin.prevout) <= 1)
              continue;  // No conflict if zero or one spends
          range = mapTxSpends.equal_range(txin.prevout);
          for (TxSpends::const_iterator it = range.first; it != range.second; ++it)
              result.insert(it->second);
      }
      return result;
  }
  
  void CWallet::Flush(bool shutdown)
  {
      bitdb.Flush(shutdown);
  }
  
  bool CWallet::Verify(const string& walletFile, string& warningString, string& errorString)
  {
      if (!bitdb.Open(GetDataDir()))
      {
          // try moving the database env out of the way
          boost::filesystem::path pathDatabase = GetDataDir() / "database";
          boost::filesystem::path pathDatabaseBak = GetDataDir() / strprintf("database.%d.bak", GetTime());
          try {
              boost::filesystem::rename(pathDatabase, pathDatabaseBak);
              LogPrintf("Moved old %s to %s. Retrying.\n", pathDatabase.string(), pathDatabaseBak.string());
          } catch (const boost::filesystem::filesystem_error&) {
              // failure is ok (well, not really, but it's not worse than what we started with)
          }
          
          // try again
          if (!bitdb.Open(GetDataDir())) {
              // if it still fails, it probably means we can't even create the database env
              string msg = strprintf(_("Error initializing wallet database environment %s!"), GetDataDir());
              errorString += msg;
              return true;
          }
      }
      
      if (GetBoolArg("-salvagewallet", false))
      {
          // Recover readable keypairs:
          if (!CWalletDB::Recover(bitdb, walletFile, true))
              return false;
      }
      
      if (boost::filesystem::exists(GetDataDir() / walletFile))
      {
          CDBEnv::VerifyResult r = bitdb.Verify(walletFile, CWalletDB::Recover);
          if (r == CDBEnv::RECOVER_OK)
          {
              warningString += strprintf(_("Warning: wallet.dat corrupt, data salvaged!"
                                       " Original wallet.dat saved as wallet.{timestamp}.bak in %s; if"
                                       " your balance or transactions are incorrect you should"
                                       " restore from a backup."), GetDataDir());
          }
          if (r == CDBEnv::RECOVER_FAIL)
              errorString += _("wallet.dat corrupt, salvage failed");
      }
      
      return true;
  }
  
  void CWallet::SyncMetaData(pair<TxSpends::iterator, TxSpends::iterator> range)
  {
      // We want all the wallet transactions in range to have the same metadata as
      // the oldest (smallest nOrderPos).
      // So: find smallest nOrderPos:
  
      int nMinOrderPos = std::numeric_limits<int>::max();
      const CWalletTx* copyFrom = NULL;
      for (TxSpends::iterator it = range.first; it != range.second; ++it)
      {
          const uint256& hash = it->second;
          int n = mapWallet[hash].nOrderPos;
          if (n < nMinOrderPos)
          {
              nMinOrderPos = n;
              copyFrom = &mapWallet[hash];
          }
      }
      // Now copy data from copyFrom to rest:
      for (TxSpends::iterator it = range.first; it != range.second; ++it)
      {
          const uint256& hash = it->second;
          CWalletTx* copyTo = &mapWallet[hash];
          if (copyFrom == copyTo) continue;
          if (!copyFrom->IsEquivalentTo(*copyTo)) continue;
          copyTo->mapValue = copyFrom->mapValue;
          copyTo->vOrderForm = copyFrom->vOrderForm;
          // fTimeReceivedIsTxTime not copied on purpose
          // nTimeReceived not copied on purpose
          copyTo->nTimeSmart = copyFrom->nTimeSmart;
          copyTo->fFromMe = copyFrom->fFromMe;
          copyTo->strFromAccount = copyFrom->strFromAccount;
          // nOrderPos not copied on purpose
          // cached members not copied on purpose
      }
  }
  
  /**
   * Outpoint is spent if any non-conflicted transaction
   * spends it:
   */
  bool CWallet::IsSpent(const uint256& hash, unsigned int n) const
  {
      const COutPoint outpoint(hash, n);
      pair<TxSpends::const_iterator, TxSpends::const_iterator> range;
      range = mapTxSpends.equal_range(outpoint);
  
      for (TxSpends::const_iterator it = range.first; it != range.second; ++it)
      {
          const uint256& wtxid = it->second;
          std::map<uint256, CWalletTx>::const_iterator mit = mapWallet.find(wtxid);
          if (mit != mapWallet.end() && mit->second.GetDepthInMainChain() >= 0)
              return true; // Spent
      }
      return false;
  }
  
  void CWallet::AddToSpends(const COutPoint& outpoint, const uint256& wtxid)
  {
      mapTxSpends.insert(make_pair(outpoint, wtxid));
  
      pair<TxSpends::iterator, TxSpends::iterator> range;
      range = mapTxSpends.equal_range(outpoint);
      SyncMetaData(range);
  }
  
  
  void CWallet::AddToSpends(const uint256& wtxid)
  {
      assert(mapWallet.count(wtxid));
      CWalletTx& thisTx = mapWallet[wtxid];
      if (thisTx.IsCoinBase()) // Coinbases don't spend anything!
          return;
  
      BOOST_FOREACH(const CTxIn& txin, thisTx.vin)
          AddToSpends(txin.prevout, wtxid);
  }
  
  bool CWallet::EncryptWallet(const SecureString& strWalletPassphrase)
  {
      if (IsCrypted())
          return false;
  
      CKeyingMaterial vMasterKey;
      RandAddSeedPerfmon();
  
      vMasterKey.resize(WALLET_CRYPTO_KEY_SIZE);
      GetRandBytes(&vMasterKey[0], WALLET_CRYPTO_KEY_SIZE);
  
      CMasterKey kMasterKey;
      RandAddSeedPerfmon();
  
      kMasterKey.vchSalt.resize(WALLET_CRYPTO_SALT_SIZE);
      GetRandBytes(&kMasterKey.vchSalt[0], WALLET_CRYPTO_SALT_SIZE);
  
      CCrypter crypter;
      int64_t nStartTime = GetTimeMillis();
      crypter.SetKeyFromPassphrase(strWalletPassphrase, kMasterKey.vchSalt, 25000, kMasterKey.nDerivationMethod);
      kMasterKey.nDeriveIterations = 2500000 / ((double)(GetTimeMillis() - nStartTime));
  
      nStartTime = GetTimeMillis();
      crypter.SetKeyFromPassphrase(strWalletPassphrase, kMasterKey.vchSalt, kMasterKey.nDeriveIterations, kMasterKey.nDerivationMethod);
      kMasterKey.nDeriveIterations = (kMasterKey.nDeriveIterations + kMasterKey.nDeriveIterations * 100 / ((double)(GetTimeMillis() - nStartTime))) / 2;
  
      if (kMasterKey.nDeriveIterations < 25000)
          kMasterKey.nDeriveIterations = 25000;
  
      LogPrintf("Encrypting Wallet with an nDeriveIterations of %i\n", kMasterKey.nDeriveIterations);
  
      if (!crypter.SetKeyFromPassphrase(strWalletPassphrase, kMasterKey.vchSalt, kMasterKey.nDeriveIterations, kMasterKey.nDerivationMethod))
          return false;
      if (!crypter.Encrypt(vMasterKey, kMasterKey.vchCryptedKey))
          return false;
  
      {
          LOCK(cs_wallet);
          mapMasterKeys[++nMasterKeyMaxID] = kMasterKey;
          if (fFileBacked)
          {
              assert(!pwalletdbEncryption);
              pwalletdbEncryption = new CWalletDB(strWalletFile);
              if (!pwalletdbEncryption->TxnBegin()) {
                  delete pwalletdbEncryption;
                  pwalletdbEncryption = NULL;
                  return false;
              }
              pwalletdbEncryption->WriteMasterKey(nMasterKeyMaxID, kMasterKey);
          }
  
          if (!EncryptKeys(vMasterKey))
          {
              if (fFileBacked) {
                  pwalletdbEncryption->TxnAbort();
                  delete pwalletdbEncryption;
              }
              // We now probably have half of our keys encrypted in memory, and half not...
              // die and let the user reload the unencrypted wallet.
              assert(false);
          }
  
          // Encryption was introduced in version 0.4.0
          SetMinVersion(FEATURE_WALLETCRYPT, pwalletdbEncryption, true);
  
          if (fFileBacked)
          {
              if (!pwalletdbEncryption->TxnCommit()) {
                  delete pwalletdbEncryption;
                  // We now have keys encrypted in memory, but not on disk...
                  // die to avoid confusion and let the user reload the unencrypted wallet.
                  assert(false);
              }
  
              delete pwalletdbEncryption;
              pwalletdbEncryption = NULL;
          }
  
          Lock();
          Unlock(strWalletPassphrase);
          NewKeyPool();
          Lock();
  
          // Need to completely rewrite the wallet file; if we don't, bdb might keep
          // bits of the unencrypted private key in slack space in the database file.
          CDB::Rewrite(strWalletFile);
  
      }
      NotifyStatusChanged(this);
  
      return true;
  }
  
  int64_t CWallet::IncOrderPosNext(CWalletDB *pwalletdb)
  {
      AssertLockHeld(cs_wallet); // nOrderPosNext
      int64_t nRet = nOrderPosNext++;
      if (pwalletdb) {
          pwalletdb->WriteOrderPosNext(nOrderPosNext);
      } else {
          CWalletDB(strWalletFile).WriteOrderPosNext(nOrderPosNext);
      }
      return nRet;
  }
  
  void CWallet::MarkDirty()
  {
      {
          LOCK(cs_wallet);
          BOOST_FOREACH(PAIRTYPE(const uint256, CWalletTx)& item, mapWallet)
              item.second.MarkDirty();
      }
  }
  
  bool CWallet::AddToWallet(const CWalletTx& wtxIn, bool fFromLoadWallet, CWalletDB* pwalletdb)
  {
      uint256 hash = wtxIn.GetHash();
  
      if (fFromLoadWallet)
      {
          mapWallet[hash] = wtxIn;
          CWalletTx& wtx = mapWallet[hash];
          wtx.BindWallet(this);
          wtxOrdered.insert(make_pair(wtx.nOrderPos, TxPair(&wtx, (CAccountingEntry*)0)));
          AddToSpends(hash);
          BOOST_FOREACH(const CTxIn& txin, wtx.vin) {
              if (mapWallet.count(txin.prevout.hash)) {
                  CWalletTx& prevtx = mapWallet[txin.prevout.hash];
                  if (prevtx.nIndex == -1 && !prevtx.hashBlock.IsNull()) {
                      MarkConflicted(prevtx.hashBlock, wtx.GetHash());
                  }
              }
          }
      }
      else
      {
          LOCK(cs_wallet);
          // Inserts only if not already there, returns tx inserted or tx found
          pair<map<uint256, CWalletTx>::iterator, bool> ret = mapWallet.insert(make_pair(hash, wtxIn));
          CWalletTx& wtx = (*ret.first).second;
          wtx.BindWallet(this);
          bool fInsertedNew = ret.second;
          if (fInsertedNew)
          {
              wtx.nTimeReceived = GetAdjustedTime();
              wtx.nOrderPos = IncOrderPosNext(pwalletdb);
              wtxOrdered.insert(make_pair(wtx.nOrderPos, TxPair(&wtx, (CAccountingEntry*)0)));
  
              wtx.nTimeSmart = wtx.nTimeReceived;
              if (!wtxIn.hashBlock.IsNull())
              {
                  if (mapBlockIndex.count(wtxIn.hashBlock))
                  {
                      int64_t latestNow = wtx.nTimeReceived;
                      int64_t latestEntry = 0;
                      {
                          // Tolerate times up to the last timestamp in the wallet not more than 5 minutes into the future
                          int64_t latestTolerated = latestNow + 300;
                          const TxItems & txOrdered = wtxOrdered;
                          for (TxItems::const_reverse_iterator it = txOrdered.rbegin(); it != txOrdered.rend(); ++it)
                          {
                              CWalletTx *const pwtx = (*it).second.first;
                              if (pwtx == &wtx)
                                  continue;
                              CAccountingEntry *const pacentry = (*it).second.second;
                              int64_t nSmartTime;
                              if (pwtx)
                              {
                                  nSmartTime = pwtx->nTimeSmart;
                                  if (!nSmartTime)
                                      nSmartTime = pwtx->nTimeReceived;
                              }
                              else
                                  nSmartTime = pacentry->nTime;
                              if (nSmartTime <= latestTolerated)
                              {
                                  latestEntry = nSmartTime;
                                  if (nSmartTime > latestNow)
                                      latestNow = nSmartTime;
                                  break;
                              }
                          }
                      }
  
                      int64_t blocktime = mapBlockIndex[wtxIn.hashBlock]->GetBlockTime();
                      wtx.nTimeSmart = std::max(latestEntry, std::min(blocktime, latestNow));
                  }
                  else
                      LogPrintf("AddToWallet(): found %s in block %s not in index\n",
                               wtxIn.GetHash().ToString(),
                               wtxIn.hashBlock.ToString());
              }
              AddToSpends(hash);
          }
  
          bool fUpdated = false;
          if (!fInsertedNew)
          {
              // Merge
              if (!wtxIn.hashBlock.IsNull() && wtxIn.hashBlock != wtx.hashBlock)
              {
                  wtx.hashBlock = wtxIn.hashBlock;
                  fUpdated = true;
              }
              if (wtxIn.nIndex != -1 && (wtxIn.nIndex != wtx.nIndex))
              {
                  wtx.nIndex = wtxIn.nIndex;
                  fUpdated = true;
              }
              if (wtxIn.fFromMe && wtxIn.fFromMe != wtx.fFromMe)
              {
                  wtx.fFromMe = wtxIn.fFromMe;
                  fUpdated = true;
              }
          }
  
          //// debug print
          LogPrintf("AddToWallet %s  %s%s\n", wtxIn.GetHash().ToString(), (fInsertedNew ? "new" : ""), (fUpdated ? "update" : ""));
  
          // Write to disk
          if (fInsertedNew || fUpdated)
              if (!wtx.WriteToDisk(pwalletdb))
                  return false;
  
          // Break debit/credit balance caches:
          wtx.MarkDirty();
  
          // Notify UI of new or updated transaction
          NotifyTransactionChanged(this, hash, fInsertedNew ? CT_NEW : CT_UPDATED);
  
          // notify an external script when a wallet transaction comes in or is updated
          std::string strCmd = GetArg("-walletnotify", "");
  
          if ( !strCmd.empty())
          {
              boost::replace_all(strCmd, "%s", wtxIn.GetHash().GetHex());
              boost::thread t(runCommand, strCmd); // thread runs free
          }
  
      }
      return true;
  }
  
  /**
   * Add a transaction to the wallet, or update it.
   * pblock is optional, but should be provided if the transaction is known to be in a block.
   * If fUpdate is true, existing transactions will be updated.
   */
  bool CWallet::AddToWalletIfInvolvingMe(const CTransaction& tx, const CBlock* pblock, bool fUpdate)
  {
      {
          AssertLockHeld(cs_wallet);
  
          if (pblock) {
              BOOST_FOREACH(const CTxIn& txin, tx.vin) {
                  std::pair<TxSpends::const_iterator, TxSpends::const_iterator> range = mapTxSpends.equal_range(txin.prevout);
                  while (range.first != range.second) {
                      if (range.first->second != tx.GetHash()) {
                          LogPrintf("Transaction %s (in block %s) conflicts with wallet transaction %s (both spend %s:%i)\n", tx.GetHash().ToString(), pblock->GetHash().ToString(), range.first->second.ToString(), range.first->first.hash.ToString(), range.first->first.n);
                          MarkConflicted(pblock->GetHash(), range.first->second);
                      }
                      range.first++;
                  }
              }
          }
  
          bool fExisted = mapWallet.count(tx.GetHash()) != 0;
          if (fExisted && !fUpdate) return false;
          if (fExisted || IsMine(tx) || IsFromMe(tx))
          {
              CWalletTx wtx(this,tx);
  
              // Get merkle branch if transaction was found in a block
              if (pblock)
                  wtx.SetMerkleBranch(*pblock);
  
              // Do not flush the wallet here for performance reasons
              // this is safe, as in case of a crash, we rescan the necessary blocks on startup through our SetBestChain-mechanism
              CWalletDB walletdb(strWalletFile, "r+", false);
  
              return AddToWallet(wtx, false, &walletdb);
          }
      }
      return false;
  }
  
  void CWallet::MarkConflicted(const uint256& hashBlock, const uint256& hashTx)
  {
      LOCK2(cs_main, cs_wallet);
  
      CBlockIndex* pindex;
      assert(mapBlockIndex.count(hashBlock));
      pindex = mapBlockIndex[hashBlock];
      int conflictconfirms = 0;
      if (chainActive.Contains(pindex)) {
          conflictconfirms = -(chainActive.Height() - pindex->nHeight + 1);
      }
      assert(conflictconfirms < 0);
  
      // Do not flush the wallet here for performance reasons
      CWalletDB walletdb(strWalletFile, "r+", false);
  
      std::deque<uint256> todo;
      std::set<uint256> done;
  
      todo.push_back(hashTx);
  
      while (!todo.empty()) {
          uint256 now = todo.front();
          todo.pop_front();
          done.insert(now);
          assert(mapWallet.count(now));
          CWalletTx& wtx = mapWallet[now];
          int currentconfirm = wtx.GetDepthInMainChain();
          if (conflictconfirms < currentconfirm) {
              // Block is 'more conflicted' than current confirm; update.
              // Mark transaction as conflicted with this block.
              wtx.nIndex = -1;
              wtx.hashBlock = hashBlock;
              wtx.MarkDirty();
              wtx.WriteToDisk(&walletdb);
              // Iterate over all its outputs, and mark transactions in the wallet that spend them conflicted too
              TxSpends::const_iterator iter = mapTxSpends.lower_bound(COutPoint(now, 0));
              while (iter != mapTxSpends.end() && iter->first.hash == now) {
                   if (!done.count(iter->second)) {
                       todo.push_back(iter->second);
                   }
                   iter++;
              }
          }
      }
  }
  
  void CWallet::SyncTransaction(const CTransaction& tx, const CBlock* pblock)
  {
      LOCK2(cs_main, cs_wallet);
  
      if (!AddToWalletIfInvolvingMe(tx, pblock, true))
          return; // Not one of ours
  
      // If a transaction changes 'conflicted' state, that changes the balance
      // available of the outputs it spends. So force those to be
      // recomputed, also:
      BOOST_FOREACH(const CTxIn& txin, tx.vin)
      {
          if (mapWallet.count(txin.prevout.hash))
              mapWallet[txin.prevout.hash].MarkDirty();
      }
  }
  
  
  isminetype CWallet::IsMine(const CTxIn &txin) const
  {
      {
          LOCK(cs_wallet);
          map<uint256, CWalletTx>::const_iterator mi = mapWallet.find(txin.prevout.hash);
          if (mi != mapWallet.end())
          {
              const CWalletTx& prev = (*mi).second;
              if (txin.prevout.n < prev.vout.size())
                  return IsMine(prev.vout[txin.prevout.n]);
          }
      }
      return ISMINE_NO;
  }
  
  CAmount CWallet::GetDebit(const CTxIn &txin, const isminefilter& filter) const
  {
      {
          LOCK(cs_wallet);
          map<uint256, CWalletTx>::const_iterator mi = mapWallet.find(txin.prevout.hash);
          if (mi != mapWallet.end())
          {
              const CWalletTx& prev = (*mi).second;
              if (txin.prevout.n < prev.vout.size())
                  if (IsMine(prev.vout[txin.prevout.n]) & filter)
                      return prev.vout[txin.prevout.n].nValue;
          }
      }
      return 0;
  }
  
  isminetype CWallet::IsMine(const CTxOut& txout) const
  {
      return ::IsMine(*this, txout.scriptPubKey);
  }
  
  CAmount CWallet::GetCredit(const CTxOut& txout, const isminefilter& filter) const
  {
      if (!MoneyRange(txout.nValue))
          throw std::runtime_error("CWallet::GetCredit(): value out of range");
      return ((IsMine(txout) & filter) ? txout.nValue : 0);
  }
  
  bool CWallet::IsChange(const CTxOut& txout) const
  {
      // TODO: fix handling of 'change' outputs. The assumption is that any
      // payment to a script that is ours, but is not in the address book
      // is change. That assumption is likely to break when we implement multisignature
      // wallets that return change back into a multi-signature-protected address;
      // a better way of identifying which outputs are 'the send' and which are
      // 'the change' will need to be implemented (maybe extend CWalletTx to remember
      // which output, if any, was change).
      if (::IsMine(*this, txout.scriptPubKey))
      {
          CTxDestination address;
          if (!ExtractDestination(txout.scriptPubKey, address))
              return true;
  
          LOCK(cs_wallet);
          if (!mapAddressBook.count(address))
              return true;
      }
      return false;
  }
  
  CAmount CWallet::GetChange(const CTxOut& txout) const
  {
      if (!MoneyRange(txout.nValue))
          throw std::runtime_error("CWallet::GetChange(): value out of range");
      return (IsChange(txout) ? txout.nValue : 0);
  }
  
  bool CWallet::IsMine(const CTransaction& tx) const
  {
      BOOST_FOREACH(const CTxOut& txout, tx.vout)
          if (IsMine(txout))
              return true;
      return false;
  }
  
  bool CWallet::IsFromMe(const CTransaction& tx) const
  {
      return (GetDebit(tx, ISMINE_ALL) > 0);
  }
  
  CAmount CWallet::GetDebit(const CTransaction& tx, const isminefilter& filter) const
  {
      CAmount nDebit = 0;
      BOOST_FOREACH(const CTxIn& txin, tx.vin)
      {
          nDebit += GetDebit(txin, filter);
          if (!MoneyRange(nDebit))
              throw std::runtime_error("CWallet::GetDebit(): value out of range");
      }
      return nDebit;
  }
  
  CAmount CWallet::GetCredit(const CTransaction& tx, const isminefilter& filter) const
  {
      CAmount nCredit = 0;
      BOOST_FOREACH(const CTxOut& txout, tx.vout)
      {
          nCredit += GetCredit(txout, filter);
          if (!MoneyRange(nCredit))
              throw std::runtime_error("CWallet::GetCredit(): value out of range");
      }
      return nCredit;
  }
  
  CAmount CWallet::GetChange(const CTransaction& tx) const
  {
      CAmount nChange = 0;
      BOOST_FOREACH(const CTxOut& txout, tx.vout)
      {
          nChange += GetChange(txout);
          if (!MoneyRange(nChange))
              throw std::runtime_error("CWallet::GetChange(): value out of range");
      }
      return nChange;
  }
  
  int64_t CWalletTx::GetTxTime() const
  {
      int64_t n = nTimeSmart;
      return n ? n : nTimeReceived;
  }
  
  int CWalletTx::GetRequestCount() const
  {
      // Returns -1 if it wasn't being tracked
      int nRequests = -1;
      {
          LOCK(pwallet->cs_wallet);
          if (IsCoinBase())
          {
              // Generated block
              if (!hashBlock.IsNull())
              {
                  map<uint256, int>::const_iterator mi = pwallet->mapRequestCount.find(hashBlock);
                  if (mi != pwallet->mapRequestCount.end())
                      nRequests = (*mi).second;
              }
          }
          else
          {
              // Did anyone request this transaction?
              map<uint256, int>::const_iterator mi = pwallet->mapRequestCount.find(GetHash());
              if (mi != pwallet->mapRequestCount.end())
              {
                  nRequests = (*mi).second;
  
                  // How about the block it's in?
                  if (nRequests == 0 && !hashBlock.IsNull())
                  {
                      map<uint256, int>::const_iterator mi = pwallet->mapRequestCount.find(hashBlock);
                      if (mi != pwallet->mapRequestCount.end())
                          nRequests = (*mi).second;
                      else
                          nRequests = 1; // If it's in someone else's block it must have got out
                  }
              }
          }
      }
      return nRequests;
  }
  
  void CWalletTx::GetAmounts(list<COutputEntry>& listReceived,
                             list<COutputEntry>& listSent, CAmount& nFee, string& strSentAccount, const isminefilter& filter) const
  {
      nFee = 0;
      listReceived.clear();
      listSent.clear();
      strSentAccount = strFromAccount;
  
      // Compute fee:
      CAmount nDebit = GetDebit(filter);
      if (nDebit > 0) // debit>0 means we signed/sent this transaction
      {
          CAmount nValueOut = GetValueOut();
          nFee = nDebit - nValueOut;
      }
  
      // Sent/received.
      for (unsigned int i = 0; i < vout.size(); ++i)
      {
          const CTxOut& txout = vout[i];
          isminetype fIsMine = pwallet->IsMine(txout);
          // Only need to handle txouts if AT LEAST one of these is true:
          //   1) they debit from us (sent)
          //   2) the output is to us (received)
          if (nDebit > 0)
          {
              // Don't report 'change' txouts
              if (pwallet->IsChange(txout))
                  continue;
          }
          else if (!(fIsMine & filter))
              continue;
  
          // In either case, we need to get the destination address
          CTxDestination address;
          if (!ExtractDestination(txout.scriptPubKey, address))
          {
              LogPrintf("CWalletTx::GetAmounts: Unknown transaction type found, txid %s\n",
                       this->GetHash().ToString());
              address = CNoDestination();
          }
  
          COutputEntry output = {address, txout.nValue, (int)i};
  
          // If we are debited by the transaction, add the output as a "sent" entry
          if (nDebit > 0)
              listSent.push_back(output);
  
          // If we are receiving the output, add it as a "received" entry
          if (fIsMine & filter)
              listReceived.push_back(output);
      }
  
  }
  
  void CWalletTx::GetAccountAmounts(const string& strAccount, CAmount& nReceived,
                                    CAmount& nSent, CAmount& nFee, const isminefilter& filter) const
  {
      nReceived = nSent = nFee = 0;
  
      CAmount allFee;
      string strSentAccount;
      list<COutputEntry> listReceived;
      list<COutputEntry> listSent;
      GetAmounts(listReceived, listSent, allFee, strSentAccount, filter);
  
      if (strAccount == strSentAccount)
      {
          BOOST_FOREACH(const COutputEntry& s, listSent)
              nSent += s.amount;
          nFee = allFee;
      }
      {
          LOCK(pwallet->cs_wallet);
          BOOST_FOREACH(const COutputEntry& r, listReceived)
          {
              if (pwallet->mapAddressBook.count(r.destination))
              {
                  map<CTxDestination, CAddressBookData>::const_iterator mi = pwallet->mapAddressBook.find(r.destination);
                  if (mi != pwallet->mapAddressBook.end() && (*mi).second.name == strAccount)
                      nReceived += r.amount;
              }
              else if (strAccount.empty())
              {
                  nReceived += r.amount;
              }
          }
      }
  }
  
  
  bool CWalletTx::WriteToDisk(CWalletDB *pwalletdb)
  {
      return pwalletdb->WriteTx(GetHash(), *this);
  }
  
  /**
   * Scan the block chain (starting in pindexStart) for transactions
   * from or to us. If fUpdate is true, found transactions that already
   * exist in the wallet will be updated.
   */
  int CWallet::ScanForWalletTransactions(CBlockIndex* pindexStart, bool fUpdate)
  {
      int ret = 0;
      int64_t nNow = GetTime();
      const CChainParams& chainParams = Params();
  
      CBlockIndex* pindex = pindexStart;
      {
          LOCK2(cs_main, cs_wallet);
  
          // no need to read and scan block, if block was created before
          // our wallet birthday (as adjusted for block time variability)
          while (pindex && nTimeFirstKey && (pindex->GetBlockTime() < (nTimeFirstKey - 7200)))
              pindex = chainActive.Next(pindex);
  
          ShowProgress(_("Rescanning..."), 0); // show rescan progress in GUI as dialog or on splashscreen, if -rescan on startup
          double dProgressStart = Checkpoints::GuessVerificationProgress(chainParams.Checkpoints(), pindex, false);
          double dProgressTip = Checkpoints::GuessVerificationProgress(chainParams.Checkpoints(), chainActive.Tip(), false);
          while (pindex)
          {
              if (pindex->nHeight % 100 == 0 && dProgressTip - dProgressStart > 0.0)
                  ShowProgress(_("Rescanning..."), std::max(1, std::min(99, (int)((Checkpoints::GuessVerificationProgress(chainParams.Checkpoints(), pindex, false) - dProgressStart) / (dProgressTip - dProgressStart) * 100))));
  
              CBlock block;
              ReadBlockFromDisk(block, pindex, Params().GetConsensus());
              BOOST_FOREACH(CTransaction& tx, block.vtx)
              {
                  if (AddToWalletIfInvolvingMe(tx, &block, fUpdate))
                      ret++;
              }
              pindex = chainActive.Next(pindex);
              if (GetTime() >= nNow + 60) {
                  nNow = GetTime();
                  LogPrintf("Still rescanning. At block %d. Progress=%f\n", pindex->nHeight, Checkpoints::GuessVerificationProgress(chainParams.Checkpoints(), pindex));
              }
          }
          ShowProgress(_("Rescanning..."), 100); // hide progress dialog in GUI
      }
      return ret;
  }
  
  void CWallet::ReacceptWalletTransactions()
  {
      // If transactions aren't being broadcasted, don't let them into local mempool either
      if (!fBroadcastTransactions)
          return;
      LOCK2(cs_main, cs_wallet);
      std::map<int64_t, CWalletTx*> mapSorted;
  
      // Sort pending wallet transactions based on their initial wallet insertion order
      BOOST_FOREACH(PAIRTYPE(const uint256, CWalletTx)& item, mapWallet)
      {
          const uint256& wtxid = item.first;
          CWalletTx& wtx = item.second;
          assert(wtx.GetHash() == wtxid);
  
          int nDepth = wtx.GetDepthInMainChain();
  
          if (!wtx.IsCoinBase() && nDepth == 0) {
              mapSorted.insert(std::make_pair(wtx.nOrderPos, &wtx));
          }
      }
  
      // Try to add wallet transactions to memory pool
      BOOST_FOREACH(PAIRTYPE(const int64_t, CWalletTx*)& item, mapSorted)
      {
          CWalletTx& wtx = *(item.second);
  
          LOCK(mempool.cs);
          wtx.AcceptToMemoryPool(false);
      }
  }
  
  bool CWalletTx::RelayWalletTransaction()
  {
      assert(pwallet->GetBroadcastTransactions());
      if (!IsCoinBase())
      {
          if (GetDepthInMainChain() == 0) {
              LogPrintf("Relaying wtx %s\n", GetHash().ToString());
              RelayTransaction((CTransaction)*this);
              return true;
          }
      }
      return false;
  }
  
  set<uint256> CWalletTx::GetConflicts() const
  {
      set<uint256> result;
      if (pwallet != NULL)
      {
          uint256 myHash = GetHash();
          result = pwallet->GetConflicts(myHash);
          result.erase(myHash);
      }
      return result;
  }
  
  CAmount CWalletTx::GetDebit(const isminefilter& filter) const
  {
      if (vin.empty())
          return 0;
  
      CAmount debit = 0;
      if(filter & ISMINE_SPENDABLE)
      {
          if (fDebitCached)
              debit += nDebitCached;
          else
          {
              nDebitCached = pwallet->GetDebit(*this, ISMINE_SPENDABLE);
              fDebitCached = true;
              debit += nDebitCached;
          }
      }
      if(filter & ISMINE_WATCH_ONLY)
      {
          if(fWatchDebitCached)
              debit += nWatchDebitCached;
          else
          {
              nWatchDebitCached = pwallet->GetDebit(*this, ISMINE_WATCH_ONLY);
              fWatchDebitCached = true;
              debit += nWatchDebitCached;
          }
      }
      return debit;
  }
  
  CAmount CWalletTx::GetCredit(const isminefilter& filter) const
  {
      // Must wait until coinbase is safely deep enough in the chain before valuing it
      if (IsCoinBase() && GetBlocksToMaturity() > 0)
          return 0;
  
      int64_t credit = 0;
      if (filter & ISMINE_SPENDABLE)
      {
          // GetBalance can assume transactions in mapWallet won't change
          if (fCreditCached)
              credit += nCreditCached;
          else
          {
              nCreditCached = pwallet->GetCredit(*this, ISMINE_SPENDABLE);
              fCreditCached = true;
              credit += nCreditCached;
          }
      }
      if (filter & ISMINE_WATCH_ONLY)
      {
          if (fWatchCreditCached)
              credit += nWatchCreditCached;
          else
          {
              nWatchCreditCached = pwallet->GetCredit(*this, ISMINE_WATCH_ONLY);
              fWatchCreditCached = true;
              credit += nWatchCreditCached;
          }
      }
      return credit;
  }
  
  CAmount CWalletTx::GetImmatureCredit(bool fUseCache) const
  {
      if (IsCoinBase() && GetBlocksToMaturity() > 0 && IsInMainChain())
      {
          if (fUseCache && fImmatureCreditCached)
              return nImmatureCreditCached;
          nImmatureCreditCached = pwallet->GetCredit(*this, ISMINE_SPENDABLE);
          fImmatureCreditCached = true;
          return nImmatureCreditCached;
      }
  
      return 0;
  }
  
  CAmount CWalletTx::GetAvailableCredit(bool fUseCache) const
  {
      if (pwallet == 0)
          return 0;
  
      // Must wait until coinbase is safely deep enough in the chain before valuing it
      if (IsCoinBase() && GetBlocksToMaturity() > 0)
          return 0;
  
      if (fUseCache && fAvailableCreditCached)
          return nAvailableCreditCached;
  
      CAmount nCredit = 0;
      uint256 hashTx = GetHash();
      for (unsigned int i = 0; i < vout.size(); i++)
      {
          if (!pwallet->IsSpent(hashTx, i))
          {
              const CTxOut &txout = vout[i];
              nCredit += pwallet->GetCredit(txout, ISMINE_SPENDABLE);
              if (!MoneyRange(nCredit))
                  throw std::runtime_error("CWalletTx::GetAvailableCredit() : value out of range");
          }
      }
  
      nAvailableCreditCached = nCredit;
      fAvailableCreditCached = true;
      return nCredit;
  }
  
  CAmount CWalletTx::GetImmatureWatchOnlyCredit(const bool& fUseCache) const
  {
      if (IsCoinBase() && GetBlocksToMaturity() > 0 && IsInMainChain())
      {
          if (fUseCache && fImmatureWatchCreditCached)
              return nImmatureWatchCreditCached;
          nImmatureWatchCreditCached = pwallet->GetCredit(*this, ISMINE_WATCH_ONLY);
          fImmatureWatchCreditCached = true;
          return nImmatureWatchCreditCached;
      }
  
      return 0;
  }
  
  CAmount CWalletTx::GetAvailableWatchOnlyCredit(const bool& fUseCache) const
  {
      if (pwallet == 0)
          return 0;
  
      // Must wait until coinbase is safely deep enough in the chain before valuing it
      if (IsCoinBase() && GetBlocksToMaturity() > 0)
          return 0;
  
      if (fUseCache && fAvailableWatchCreditCached)
          return nAvailableWatchCreditCached;
  
      CAmount nCredit = 0;
      for (unsigned int i = 0; i < vout.size(); i++)
      {
          if (!pwallet->IsSpent(GetHash(), i))
          {
              const CTxOut &txout = vout[i];
              nCredit += pwallet->GetCredit(txout, ISMINE_WATCH_ONLY);
              if (!MoneyRange(nCredit))
                  throw std::runtime_error("CWalletTx::GetAvailableCredit() : value out of range");
          }
      }
  
      nAvailableWatchCreditCached = nCredit;
      fAvailableWatchCreditCached = true;
      return nCredit;
  }
  
  CAmount CWalletTx::GetChange() const
  {
      if (fChangeCached)
          return nChangeCached;
      nChangeCached = pwallet->GetChange(*this);
      fChangeCached = true;
      return nChangeCached;
  }
  
  bool CWalletTx::IsTrusted() const
  {
      // Quick answer in most cases
      if (!CheckFinalTx(*this))
          return false;
      int nDepth = GetDepthInMainChain();
      if (nDepth >= 1)
          return true;
      if (nDepth < 0)
          return false;
      if (!bSpendZeroConfChange || !IsFromMe(ISMINE_ALL)) // using wtx's cached debit
          return false;
  
      // Don't trust unconfirmed transactions from us unless they are in the mempool.
      {
          LOCK(mempool.cs);
          if (!mempool.exists(GetHash())) {
              return false;
          }
      }
  
      // Trusted if all inputs are from us and are in the mempool:
      BOOST_FOREACH(const CTxIn& txin, vin)
      {
          // Transactions not sent by us: not trusted
          const CWalletTx* parent = pwallet->GetWalletTx(txin.prevout.hash);
          if (parent == NULL)
              return false;
          const CTxOut& parentOut = parent->vout[txin.prevout.n];
          if (pwallet->IsMine(parentOut) != ISMINE_SPENDABLE)
              return false;
      }
      return true;
  }
  
  bool CWalletTx::IsEquivalentTo(const CWalletTx& tx) const
  {
          CMutableTransaction tx1 = *this;
          CMutableTransaction tx2 = tx;
          for (unsigned int i = 0; i < tx1.vin.size(); i++) tx1.vin[i].scriptSig = CScript();
          for (unsigned int i = 0; i < tx2.vin.size(); i++) tx2.vin[i].scriptSig = CScript();
          return CTransaction(tx1) == CTransaction(tx2);
  }
  
  std::vector<uint256> CWallet::ResendWalletTransactionsBefore(int64_t nTime)
  {
      std::vector<uint256> result;
  
      LOCK(cs_wallet);
      // Sort them in chronological order
      multimap<unsigned int, CWalletTx*> mapSorted;
      BOOST_FOREACH(PAIRTYPE(const uint256, CWalletTx)& item, mapWallet)
      {
          CWalletTx& wtx = item.second;
          // Don't rebroadcast if newer than nTime:
          if (wtx.nTimeReceived > nTime)
              continue;
          mapSorted.insert(make_pair(wtx.nTimeReceived, &wtx));
      }
      BOOST_FOREACH(PAIRTYPE(const unsigned int, CWalletTx*)& item, mapSorted)
      {
          CWalletTx& wtx = *item.second;
          if (wtx.RelayWalletTransaction())
              result.push_back(wtx.GetHash());
      }
      return result;
  }
  
  void CWallet::ResendWalletTransactions(int64_t nBestBlockTime)
  {
      // Do this infrequently and randomly to avoid giving away
      // that these are our transactions.
      if (GetTime() < nNextResend || !fBroadcastTransactions)
          return;
      bool fFirst = (nNextResend == 0);
      nNextResend = GetTime() + GetRand(30 * 60);
      if (fFirst)
          return;
  
      // Only do it if there's been a new block since last time
      if (nBestBlockTime < nLastResend)
          return;
      nLastResend = GetTime();
  
      // Rebroadcast unconfirmed txes older than 5 minutes before the last
      // block was found:
      std::vector<uint256> relayed = ResendWalletTransactionsBefore(nBestBlockTime-5*60);
      if (!relayed.empty())
          LogPrintf("%s: rebroadcast %u unconfirmed transactions\n", __func__, relayed.size());
  }
  
  /** @} */ // end of mapWallet
  
  
  
  
  /** @defgroup Actions
   *
   * @{
   */
  
  
  CAmount CWallet::GetBalance() const
  {
      CAmount nTotal = 0;
      {
          LOCK2(cs_main, cs_wallet);
          for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
          {
              const CWalletTx* pcoin = &(*it).second;
              if (pcoin->IsTrusted())
                  nTotal += pcoin->GetAvailableCredit();
          }
      }
  
      return nTotal;
  }
  
  CAmount CWallet::GetUnconfirmedBalance() const
  {
      CAmount nTotal = 0;
      {
          LOCK2(cs_main, cs_wallet);
          for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
          {
              const CWalletTx* pcoin = &(*it).second;
              if (!CheckFinalTx(*pcoin) || (!pcoin->IsTrusted() && pcoin->GetDepthInMainChain() == 0))
                  nTotal += pcoin->GetAvailableCredit();
          }
      }
      return nTotal;
  }
  
  CAmount CWallet::GetImmatureBalance() const
  {
      CAmount nTotal = 0;
      {
          LOCK2(cs_main, cs_wallet);
          for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
          {
              const CWalletTx* pcoin = &(*it).second;
              nTotal += pcoin->GetImmatureCredit();
          }
      }
      return nTotal;
  }
  
  CAmount CWallet::GetWatchOnlyBalance() const
  {
      CAmount nTotal = 0;
      {
          LOCK2(cs_main, cs_wallet);
          for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
          {
              const CWalletTx* pcoin = &(*it).second;
              if (pcoin->IsTrusted())
                  nTotal += pcoin->GetAvailableWatchOnlyCredit();
          }
      }
  
      return nTotal;
  }
  
  CAmount CWallet::GetUnconfirmedWatchOnlyBalance() const
  {
      CAmount nTotal = 0;
      {
          LOCK2(cs_main, cs_wallet);
          for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
          {
              const CWalletTx* pcoin = &(*it).second;
              if (!CheckFinalTx(*pcoin) || (!pcoin->IsTrusted() && pcoin->GetDepthInMainChain() == 0))
                  nTotal += pcoin->GetAvailableWatchOnlyCredit();
          }
      }
      return nTotal;
  }
  
  CAmount CWallet::GetImmatureWatchOnlyBalance() const
  {
      CAmount nTotal = 0;
      {
          LOCK2(cs_main, cs_wallet);
          for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
          {
              const CWalletTx* pcoin = &(*it).second;
              nTotal += pcoin->GetImmatureWatchOnlyCredit();
          }
      }
      return nTotal;
  }
  
  void CWallet::AvailableCoins(vector<COutput>& vCoins, bool fOnlyConfirmed, const CCoinControl *coinControl, bool fIncludeZeroValue) const
  {
      vCoins.clear();
  
      {
          LOCK2(cs_main, cs_wallet);
          for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
          {
              const uint256& wtxid = it->first;
              const CWalletTx* pcoin = &(*it).second;
  
              if (!CheckFinalTx(*pcoin))
                  continue;
  
              if (fOnlyConfirmed && !pcoin->IsTrusted())
                  continue;
  
              if (pcoin->IsCoinBase() && pcoin->GetBlocksToMaturity() > 0)
                  continue;
  
              int nDepth = pcoin->GetDepthInMainChain();
              if (nDepth < 0)
                  continue;
  
              for (unsigned int i = 0; i < pcoin->vout.size(); i++) {
                  isminetype mine = IsMine(pcoin->vout[i]);
                  if (!(IsSpent(wtxid, i)) && mine != ISMINE_NO &&
                      !IsLockedCoin((*it).first, i) && (pcoin->vout[i].nValue > 0 || fIncludeZeroValue) &&
                      (!coinControl || !coinControl->HasSelected() || coinControl->fAllowOtherInputs || coinControl->IsSelected((*it).first, i)))
                          vCoins.push_back(COutput(pcoin, i, nDepth,
                                                   ((mine & ISMINE_SPENDABLE) != ISMINE_NO) ||
                                                    (coinControl && coinControl->fAllowWatchOnly && (mine & ISMINE_WATCH_SOLVABLE) != ISMINE_NO)));
              }
          }
      }
  }
  
  static void ApproximateBestSubset(vector<pair<CAmount, pair<const CWalletTx*,unsigned int> > >vValue, const CAmount& nTotalLower, const CAmount& nTargetValue,
                                    vector<char>& vfBest, CAmount& nBest, int iterations = 1000)
  {
      vector<char> vfIncluded;
  
      vfBest.assign(vValue.size(), true);
      nBest = nTotalLower;
  
      seed_insecure_rand();
  
      for (int nRep = 0; nRep < iterations && nBest != nTargetValue; nRep++)
      {
          vfIncluded.assign(vValue.size(), false);
          CAmount nTotal = 0;
          bool fReachedTarget = false;
          for (int nPass = 0; nPass < 2 && !fReachedTarget; nPass++)
          {
              for (unsigned int i = 0; i < vValue.size(); i++)
              {
                  //The solver here uses a randomized algorithm,
                  //the randomness serves no real security purpose but is just
                  //needed to prevent degenerate behavior and it is important
                  //that the rng is fast. We do not use a constant random sequence,
                  //because there may be some privacy improvement by making
                  //the selection random.
                  if (nPass == 0 ? insecure_rand()&1 : !vfIncluded[i])
                  {
                      nTotal += vValue[i].first;
                      vfIncluded[i] = true;
                      if (nTotal >= nTargetValue)
                      {
                          fReachedTarget = true;
                          if (nTotal < nBest)
                          {
                              nBest = nTotal;
                              vfBest = vfIncluded;
                          }
                          nTotal -= vValue[i].first;
                          vfIncluded[i] = false;
                      }
                  }
              }
          }
      }
  }
  
  bool CWallet::SelectCoinsMinConf(const CAmount& nTargetValue, int nConfMine, int nConfTheirs, vector<COutput> vCoins,
                                   set<pair<const CWalletTx*,unsigned int> >& setCoinsRet, CAmount& nValueRet) const
  {
      setCoinsRet.clear();
      nValueRet = 0;
  
      // List of values less than target
      pair<CAmount, pair<const CWalletTx*,unsigned int> > coinLowestLarger;
      coinLowestLarger.first = std::numeric_limits<CAmount>::max();
      coinLowestLarger.second.first = NULL;
      vector<pair<CAmount, pair<const CWalletTx*,unsigned int> > > vValue;
      CAmount nTotalLower = 0;
  
      random_shuffle(vCoins.begin(), vCoins.end(), GetRandInt);
  
      BOOST_FOREACH(const COutput &output, vCoins)
      {
          if (!output.fSpendable)
              continue;
  
          const CWalletTx *pcoin = output.tx;
  
          if (output.nDepth < (pcoin->IsFromMe(ISMINE_ALL) ? nConfMine : nConfTheirs))
              continue;
  
          int i = output.i;
          CAmount n = pcoin->vout[i].nValue;
  
          pair<CAmount,pair<const CWalletTx*,unsigned int> > coin = make_pair(n,make_pair(pcoin, i));
  
          if (n == nTargetValue)
          {
              setCoinsRet.insert(coin.second);
              nValueRet += coin.first;
              return true;
          }
          else if (n < nTargetValue + MIN_CHANGE)
          {
              vValue.push_back(coin);
              nTotalLower += n;
          }
          else if (n < coinLowestLarger.first)
          {
              coinLowestLarger = coin;
          }
      }
  
      if (nTotalLower == nTargetValue)
      {
          for (unsigned int i = 0; i < vValue.size(); ++i)
          {
              setCoinsRet.insert(vValue[i].second);
              nValueRet += vValue[i].first;
          }
          return true;
      }
  
      if (nTotalLower < nTargetValue)
      {
          if (coinLowestLarger.second.first == NULL)
              return false;
          setCoinsRet.insert(coinLowestLarger.second);
          nValueRet += coinLowestLarger.first;
          return true;
      }
  
      // Solve subset sum by stochastic approximation
      sort(vValue.rbegin(), vValue.rend(), CompareValueOnly());
      vector<char> vfBest;
      CAmount nBest;
  
      ApproximateBestSubset(vValue, nTotalLower, nTargetValue, vfBest, nBest);
      if (nBest != nTargetValue && nTotalLower >= nTargetValue + MIN_CHANGE)
          ApproximateBestSubset(vValue, nTotalLower, nTargetValue + MIN_CHANGE, vfBest, nBest);
  
      // If we have a bigger coin and (either the stochastic approximation didn't find a good solution,
      //                                   or the next bigger coin is closer), return the bigger coin
      if (coinLowestLarger.second.first &&
          ((nBest != nTargetValue && nBest < nTargetValue + MIN_CHANGE) || coinLowestLarger.first <= nBest))
      {
          setCoinsRet.insert(coinLowestLarger.second);
          nValueRet += coinLowestLarger.first;
      }
      else {
          for (unsigned int i = 0; i < vValue.size(); i++)
              if (vfBest[i])
              {
                  setCoinsRet.insert(vValue[i].second);
                  nValueRet += vValue[i].first;
              }
  
          LogPrint("selectcoins", "SelectCoins() best subset: ");
          for (unsigned int i = 0; i < vValue.size(); i++)
              if (vfBest[i])
                  LogPrint("selectcoins", "%s ", FormatMoney(vValue[i].first));
          LogPrint("selectcoins", "total %s\n", FormatMoney(nBest));
      }
  
      return true;
  }
  
  bool CWallet::SelectCoins(const CAmount& nTargetValue, set<pair<const CWalletTx*,unsigned int> >& setCoinsRet, CAmount& nValueRet, const CCoinControl* coinControl) const
  {
      vector<COutput> vCoins;
      AvailableCoins(vCoins, true, coinControl);
  
      // coin control -> return all selected outputs (we want all selected to go into the transaction for sure)
      if (coinControl && coinControl->HasSelected() && !coinControl->fAllowOtherInputs)
      {
          BOOST_FOREACH(const COutput& out, vCoins)
          {
              if (!out.fSpendable)
                   continue;
              nValueRet += out.tx->vout[out.i].nValue;
              setCoinsRet.insert(make_pair(out.tx, out.i));
          }
          return (nValueRet >= nTargetValue);
      }
  
      // calculate value from preset inputs and store them
      set<pair<const CWalletTx*, uint32_t> > setPresetCoins;
      CAmount nValueFromPresetInputs = 0;
  
      std::vector<COutPoint> vPresetInputs;
      if (coinControl)
          coinControl->ListSelected(vPresetInputs);
      BOOST_FOREACH(const COutPoint& outpoint, vPresetInputs)
      {
          map<uint256, CWalletTx>::const_iterator it = mapWallet.find(outpoint.hash);
          if (it != mapWallet.end())
          {
              const CWalletTx* pcoin = &it->second;
              // Clearly invalid input, fail
              if (pcoin->vout.size() <= outpoint.n)
                  return false;
              nValueFromPresetInputs += pcoin->vout[outpoint.n].nValue;
              setPresetCoins.insert(make_pair(pcoin, outpoint.n));
          } else
              return false; // TODO: Allow non-wallet inputs
      }
  
      // remove preset inputs from vCoins
      for (vector<COutput>::iterator it = vCoins.begin(); it != vCoins.end() && coinControl && coinControl->HasSelected();)
      {
          if (setPresetCoins.count(make_pair(it->tx, it->i)))
              it = vCoins.erase(it);
          else
              ++it;
      }
  
      bool res = nTargetValue <= nValueFromPresetInputs ||
          SelectCoinsMinConf(nTargetValue - nValueFromPresetInputs, 1, 6, vCoins, setCoinsRet, nValueRet) ||
          SelectCoinsMinConf(nTargetValue - nValueFromPresetInputs, 1, 1, vCoins, setCoinsRet, nValueRet) ||
          (bSpendZeroConfChange && SelectCoinsMinConf(nTargetValue - nValueFromPresetInputs, 0, 1, vCoins, setCoinsRet, nValueRet));
  
      // because SelectCoinsMinConf clears the setCoinsRet, we now add the possible inputs to the coinset
      setCoinsRet.insert(setPresetCoins.begin(), setPresetCoins.end());
  
      // add preset inputs to the total value selected
      nValueRet += nValueFromPresetInputs;
  
      return res;
  }
  
  bool CWallet::FundTransaction(CMutableTransaction& tx, CAmount &nFeeRet, int& nChangePosRet, std::string& strFailReason, bool includeWatching)
  {
      vector<CRecipient> vecSend;
  
      // Turn the txout set into a CRecipient vector
      BOOST_FOREACH(const CTxOut& txOut, tx.vout)
      {
          CRecipient recipient = {txOut.scriptPubKey, txOut.nValue, false};
          vecSend.push_back(recipient);
      }
  
      CCoinControl coinControl;
      coinControl.fAllowOtherInputs = true;
      coinControl.fAllowWatchOnly = includeWatching;
      BOOST_FOREACH(const CTxIn& txin, tx.vin)
          coinControl.Select(txin.prevout);
  
      CReserveKey reservekey(this);
      CWalletTx wtx;
      if (!CreateTransaction(vecSend, wtx, reservekey, nFeeRet, nChangePosRet, strFailReason, &coinControl, false))
          return false;
  
      if (nChangePosRet != -1)
          tx.vout.insert(tx.vout.begin() + nChangePosRet, wtx.vout[nChangePosRet]);
  
      // Add new txins (keeping original txin scriptSig/order)
      BOOST_FOREACH(const CTxIn& txin, wtx.vin)
      {
          bool found = false;
          BOOST_FOREACH(const CTxIn& origTxIn, tx.vin)
          {
              if (txin.prevout.hash == origTxIn.prevout.hash && txin.prevout.n == origTxIn.prevout.n)
              {
                  found = true;
                  break;
              }
          }
          if (!found)
              tx.vin.push_back(txin);
      }
  
      return true;
  }
  
  bool CWallet::CreateTransaction(const vector<CRecipient>& vecSend, CWalletTx& wtxNew, CReserveKey& reservekey, CAmount& nFeeRet,
                                  int& nChangePosRet, std::string& strFailReason, const CCoinControl* coinControl, bool sign)
  {
      CAmount nValue = 0;
      unsigned int nSubtractFeeFromAmount = 0;
      BOOST_FOREACH (const CRecipient& recipient, vecSend)
      {
          if (nValue < 0 || recipient.nAmount < 0)
          {
              strFailReason = _("Transaction amounts must be positive");
              return false;
          }
          nValue += recipient.nAmount;
  
          if (recipient.fSubtractFeeFromAmount)
              nSubtractFeeFromAmount++;
      }
      if (vecSend.empty() || nValue < 0)
      {
          strFailReason = _("Transaction amounts must be positive");
          return false;
      }
  
      wtxNew.fTimeReceivedIsTxTime = true;
      wtxNew.BindWallet(this);
      CMutableTransaction txNew;
  
      // Discourage fee sniping.
      //
      // For a large miner the value of the transactions in the best block and
      // the mempool can exceed the cost of deliberately attempting to mine two
      // blocks to orphan the current best block. By setting nLockTime such that
      // only the next block can include the transaction, we discourage this
      // practice as the height restricted and limited blocksize gives miners
      // considering fee sniping fewer options for pulling off this attack.
      //
      // A simple way to think about this is from the wallet's point of view we
      // always want the blockchain to move forward. By setting nLockTime this
      // way we're basically making the statement that we only want this
      // transaction to appear in the next block; we don't want to potentially
      // encourage reorgs by allowing transactions to appear at lower heights
      // than the next block in forks of the best chain.
      //
      // Of course, the subsidy is high enough, and transaction volume low
      // enough, that fee sniping isn't a problem yet, but by implementing a fix
      // now we ensure code won't be written that makes assumptions about
      // nLockTime that preclude a fix later.
      txNew.nLockTime = chainActive.Height();
  
      // Secondly occasionally randomly pick a nLockTime even further back, so
      // that transactions that are delayed after signing for whatever reason,
      // e.g. high-latency mix networks and some CoinJoin implementations, have
      // better privacy.
      if (GetRandInt(10) == 0)
          txNew.nLockTime = std::max(0, (int)txNew.nLockTime - GetRandInt(100));
  
      assert(txNew.nLockTime <= (unsigned int)chainActive.Height());
      assert(txNew.nLockTime < LOCKTIME_THRESHOLD);
  
      {
          LOCK2(cs_main, cs_wallet);
          {
              nFeeRet = 0;
              // Start with no fee and loop until there is enough fee
              while (true)
              {
                  txNew.vin.clear();
                  txNew.vout.clear();
                  wtxNew.fFromMe = true;
                  nChangePosRet = -1;
                  bool fFirst = true;
  
                  CAmount nValueToSelect = nValue;
                  if (nSubtractFeeFromAmount == 0)
                      nValueToSelect += nFeeRet;
                  double dPriority = 0;
                  // vouts to the payees
                  BOOST_FOREACH (const CRecipient& recipient, vecSend)
                  {
                      CTxOut txout(recipient.nAmount, recipient.scriptPubKey);
  
                      if (recipient.fSubtractFeeFromAmount)
                      {
                          txout.nValue -= nFeeRet / nSubtractFeeFromAmount; // Subtract fee equally from each selected recipient
  
                          if (fFirst) // first receiver pays the remainder not divisible by output count
                          {
                              fFirst = false;
                              txout.nValue -= nFeeRet % nSubtractFeeFromAmount;
                          }
                      }
  
                      if (txout.IsDust(::minRelayTxFee))
                      {
                          if (recipient.fSubtractFeeFromAmount && nFeeRet > 0)
                          {
                              if (txout.nValue < 0)
                                  strFailReason = _("The transaction amount is too small to pay the fee");
                              else
                                  strFailReason = _("The transaction amount is too small to send after the fee has been deducted");
                          }
                          else
                              strFailReason = _("Transaction amount too small");
                          return false;
                      }
                      txNew.vout.push_back(txout);
                  }
  
                  // Choose coins to use
                  set<pair<const CWalletTx*,unsigned int> > setCoins;
                  CAmount nValueIn = 0;
                  if (!SelectCoins(nValueToSelect, setCoins, nValueIn, coinControl))
                  {
                      strFailReason = _("Insufficient funds");
                      return false;
                  }
                  BOOST_FOREACH(PAIRTYPE(const CWalletTx*, unsigned int) pcoin, setCoins)
                  {
                      CAmount nCredit = pcoin.first->vout[pcoin.second].nValue;
                      //The coin age after the next block (depth+1) is used instead of the current,
                      //reflecting an assumption the user would accept a bit more delay for
                      //a chance at a free transaction.
                      //But mempool inputs might still be in the mempool, so their age stays 0
                      int age = pcoin.first->GetDepthInMainChain();
                      assert(age >= 0);
                      if (age != 0)
                          age += 1;
                      dPriority += (double)nCredit * age;
                  }
  
                  const CAmount nChange = nValueIn - nValueToSelect;
                  if (nChange > 0)
                  {
                      // Fill a vout to ourself
                      // TODO: pass in scriptChange instead of reservekey so
                      // change transaction isn't always pay-to-bitcoin-address
                      CScript scriptChange;
  
                      // coin control: send change to custom address
                      if (coinControl && !boost::get<CNoDestination>(&coinControl->destChange))
                          scriptChange = GetScriptForDestination(coinControl->destChange);
  
                      // no coin control: send change to newly generated address
                      else
                      {
                          // Note: We use a new key here to keep it from being obvious which side is the change.
                          //  The drawback is that by not reusing a previous key, the change may be lost if a
                          //  backup is restored, if the backup doesn't have the new private key for the change.
                          //  If we reused the old key, it would be possible to add code to look for and
                          //  rediscover unknown transactions that were written with keys of ours to recover
                          //  post-backup change.
  
                          // Reserve a new key pair from key pool
                          CPubKey vchPubKey;
                          bool ret;
                          ret = reservekey.GetReservedKey(vchPubKey);
                          assert(ret); // should never fail, as we just unlocked
  
                          scriptChange = GetScriptForDestination(vchPubKey.GetID());
                      }
  
                      CTxOut newTxOut(nChange, scriptChange);
  
                      // We do not move dust-change to fees, because the sender would end up paying more than requested.
                      // This would be against the purpose of the all-inclusive feature.
                      // So instead we raise the change and deduct from the recipient.
                      if (nSubtractFeeFromAmount > 0 && newTxOut.IsDust(::minRelayTxFee))
                      {
                          CAmount nDust = newTxOut.GetDustThreshold(::minRelayTxFee) - newTxOut.nValue;
                          newTxOut.nValue += nDust; // raise change until no more dust
                          for (unsigned int i = 0; i < vecSend.size(); i++) // subtract from first recipient
                          {
                              if (vecSend[i].fSubtractFeeFromAmount)
                              {
                                  txNew.vout[i].nValue -= nDust;
                                  if (txNew.vout[i].IsDust(::minRelayTxFee))
                                  {
                                      strFailReason = _("The transaction amount is too small to send after the fee has been deducted");
                                      return false;
                                  }
                                  break;
                              }
                          }
                      }
  
                      // Never create dust outputs; if we would, just
                      // add the dust to the fee.
                      if (newTxOut.IsDust(::minRelayTxFee))
                      {
                          nFeeRet += nChange;
                          reservekey.ReturnKey();
                      }
                      else
                      {
                          // Insert change txn at random position:
                          nChangePosRet = GetRandInt(txNew.vout.size()+1);
                          vector<CTxOut>::iterator position = txNew.vout.begin()+nChangePosRet;
                          txNew.vout.insert(position, newTxOut);
                      }
                  }
                  else
                      reservekey.ReturnKey();
  
                  // Fill vin
                  //
                  // Note how the sequence number is set to max()-1 so that the
                  // nLockTime set above actually works.
                  BOOST_FOREACH(const PAIRTYPE(const CWalletTx*,unsigned int)& coin, setCoins)
                      txNew.vin.push_back(CTxIn(coin.first->GetHash(),coin.second,CScript(),
                                                std::numeric_limits<unsigned int>::max()-1));
  
                  // Sign
                  int nIn = 0;
                  CTransaction txNewConst(txNew);
                  BOOST_FOREACH(const PAIRTYPE(const CWalletTx*,unsigned int)& coin, setCoins)
                  {
                      bool signSuccess;
                      const CScript& scriptPubKey = coin.first->vout[coin.second].scriptPubKey;
                      CScript& scriptSigRes = txNew.vin[nIn].scriptSig;
                      if (sign)
                          signSuccess = ProduceSignature(TransactionSignatureCreator(this, &txNewConst, nIn, SIGHASH_ALL), scriptPubKey, scriptSigRes);
                      else
                          signSuccess = ProduceSignature(DummySignatureCreator(this), scriptPubKey, scriptSigRes);
  
                      if (!signSuccess)
                      {
                          strFailReason = _("Signing transaction failed");
                          return false;
                      }
                      nIn++;
                  }
  
                  unsigned int nBytes = ::GetSerializeSize(txNew, SER_NETWORK, PROTOCOL_VERSION);
  
                  // Remove scriptSigs if we used dummy signatures for fee calculation
                  if (!sign) {
                      BOOST_FOREACH (CTxIn& vin, txNew.vin)
                          vin.scriptSig = CScript();
                  }
  
                  // Embed the constructed transaction data in wtxNew.
                  *static_cast<CTransaction*>(&wtxNew) = CTransaction(txNew);
  
                  // Limit size
                  if (nBytes >= MAX_STANDARD_TX_SIZE)
                  {
                      strFailReason = _("Transaction too large");
                      return false;
                  }
  
                  dPriority = wtxNew.ComputePriority(dPriority, nBytes);
  
                  // Can we complete this as a free transaction?
                  if (fSendFreeTransactions && nBytes <= MAX_FREE_TRANSACTION_CREATE_SIZE)
                  {
                      // Not enough fee: enough priority?
                      double dPriorityNeeded = mempool.estimateSmartPriority(nTxConfirmTarget);
                      // Require at least hard-coded AllowFree.
                      if (dPriority >= dPriorityNeeded && AllowFree(dPriority))
                          break;
                  }
  
                  CAmount nFeeNeeded = GetMinimumFee(nBytes, nTxConfirmTarget, mempool);
                  if (coinControl && nFeeNeeded > 0 && coinControl->nMinimumTotalFee > nFeeNeeded) {
                      nFeeNeeded = coinControl->nMinimumTotalFee;
                  }
  
                  // If we made it here and we aren't even able to meet the relay fee on the next pass, give up
                  // because we must be at the maximum allowed fee.
                  if (nFeeNeeded < ::minRelayTxFee.GetFee(nBytes))
                  {
                      strFailReason = _("Transaction too large for fee policy");
                      return false;
                  }
  
                  if (nFeeRet >= nFeeNeeded)
                      break; // Done, enough fee included.
  
                  // Include more fee and try again.
                  nFeeRet = nFeeNeeded;
                  continue;
              }
          }
      }
  
      return true;
  }
  
  /**
   * Call after CreateTransaction unless you want to abort
   */
  bool CWallet::CommitTransaction(CWalletTx& wtxNew, CReserveKey& reservekey)
  {
      {
          LOCK2(cs_main, cs_wallet);
          LogPrintf("CommitTransaction:\n%s", wtxNew.ToString());
          {
              // This is only to keep the database open to defeat the auto-flush for the
              // duration of this scope.  This is the only place where this optimization
              // maybe makes sense; please don't do it anywhere else.
              CWalletDB* pwalletdb = fFileBacked ? new CWalletDB(strWalletFile,"r+") : NULL;
  
              // Take key pair from key pool so it won't be used again
              reservekey.KeepKey();
  
              // Add tx to wallet, because if it has change it's also ours,
              // otherwise just for transaction history.
              AddToWallet(wtxNew, false, pwalletdb);
  
              // Notify that old coins are spent
              set<CWalletTx*> setCoins;
              BOOST_FOREACH(const CTxIn& txin, wtxNew.vin)
              {
                  CWalletTx &coin = mapWallet[txin.prevout.hash];
                  coin.BindWallet(this);
                  NotifyTransactionChanged(this, coin.GetHash(), CT_UPDATED);
              }
  
              if (fFileBacked)
                  delete pwalletdb;
          }
  
          // Track how many getdata requests our transaction gets
          mapRequestCount[wtxNew.GetHash()] = 0;
  
          if (fBroadcastTransactions)
          {
              // Broadcast
              if (!wtxNew.AcceptToMemoryPool(false))
              {
                  // This must not fail. The transaction has already been signed and recorded.
                  LogPrintf("CommitTransaction(): Error: Transaction not valid\n");
                  return false;
              }
              wtxNew.RelayWalletTransaction();
          }
      }
      return true;
  }
  
  bool CWallet::AddAccountingEntry(const CAccountingEntry& acentry, CWalletDB & pwalletdb)
  {
      if (!pwalletdb.WriteAccountingEntry_Backend(acentry))
          return false;
  
      laccentries.push_back(acentry);
      CAccountingEntry & entry = laccentries.back();
      wtxOrdered.insert(make_pair(entry.nOrderPos, TxPair((CWalletTx*)0, &entry)));
  
      return true;
  }
  
  CAmount CWallet::GetRequiredFee(unsigned int nTxBytes)
  {
      return std::max(minTxFee.GetFee(nTxBytes), ::minRelayTxFee.GetFee(nTxBytes));
  }
  
  CAmount CWallet::GetMinimumFee(unsigned int nTxBytes, unsigned int nConfirmTarget, const CTxMemPool& pool)
  {
      // payTxFee is user-set "I want to pay this much"
      CAmount nFeeNeeded = payTxFee.GetFee(nTxBytes);
      // User didn't set: use -txconfirmtarget to estimate...
      if (nFeeNeeded == 0) {
          int estimateFoundTarget = nConfirmTarget;
          nFeeNeeded = pool.estimateSmartFee(nConfirmTarget, &estimateFoundTarget).GetFee(nTxBytes);
          // ... unless we don't have enough mempool data for our desired target
          // so we make sure we're paying at least minTxFee
          if (nFeeNeeded == 0 || (unsigned int)estimateFoundTarget > nConfirmTarget)
              nFeeNeeded = std::max(nFeeNeeded, GetRequiredFee(nTxBytes));
      }
      // prevent user from paying a non-sense fee (like 1 satoshi): 0 < fee < minRelayFee
      if (nFeeNeeded < ::minRelayTxFee.GetFee(nTxBytes))
          nFeeNeeded = ::minRelayTxFee.GetFee(nTxBytes);
      // But always obey the maximum
      if (nFeeNeeded > maxTxFee)
          nFeeNeeded = maxTxFee;
      return nFeeNeeded;
  }
  
  
  
  
  DBErrors CWallet::LoadWallet(bool& fFirstRunRet)
  {
      if (!fFileBacked)
          return DB_LOAD_OK;
      fFirstRunRet = false;
      DBErrors nLoadWalletRet = CWalletDB(strWalletFile,"cr+").LoadWallet(this);
      if (nLoadWalletRet == DB_NEED_REWRITE)
      {
          if (CDB::Rewrite(strWalletFile, "\x04pool"))
          {
              LOCK(cs_wallet);
              setKeyPool.clear();
              // Note: can't top-up keypool here, because wallet is locked.
              // User will be prompted to unlock wallet the next operation
              // that requires a new key.
          }
      }
  
      if (nLoadWalletRet != DB_LOAD_OK)
          return nLoadWalletRet;
      fFirstRunRet = !vchDefaultKey.IsValid();
  
      uiInterface.LoadWallet(this);
  
      return DB_LOAD_OK;
  }
  
  
  DBErrors CWallet::ZapWalletTx(std::vector<CWalletTx>& vWtx)
  {
      if (!fFileBacked)
          return DB_LOAD_OK;
      DBErrors nZapWalletTxRet = CWalletDB(strWalletFile,"cr+").ZapWalletTx(this, vWtx);
      if (nZapWalletTxRet == DB_NEED_REWRITE)
      {
          if (CDB::Rewrite(strWalletFile, "\x04pool"))
          {
              LOCK(cs_wallet);
              setKeyPool.clear();
              // Note: can't top-up keypool here, because wallet is locked.
              // User will be prompted to unlock wallet the next operation
              // that requires a new key.
          }
      }
  
      if (nZapWalletTxRet != DB_LOAD_OK)
          return nZapWalletTxRet;
  
      return DB_LOAD_OK;
  }
  
  
  bool CWallet::SetAddressBook(const CTxDestination& address, const string& strName, const string& strPurpose)
  {
      bool fUpdated = false;
      {
          LOCK(cs_wallet); // mapAddressBook
          std::map<CTxDestination, CAddressBookData>::iterator mi = mapAddressBook.find(address);
          fUpdated = mi != mapAddressBook.end();
          mapAddressBook[address].name = strName;
          if (!strPurpose.empty()) /* update purpose only if requested */
              mapAddressBook[address].purpose = strPurpose;
      }
      NotifyAddressBookChanged(this, address, strName, ::IsMine(*this, address) != ISMINE_NO,
                               strPurpose, (fUpdated ? CT_UPDATED : CT_NEW) );
      if (!fFileBacked)
          return false;
      if (!strPurpose.empty() && !CWalletDB(strWalletFile).WritePurpose(CBitcoinAddress(address).ToString(), strPurpose))
          return false;
      return CWalletDB(strWalletFile).WriteName(CBitcoinAddress(address).ToString(), strName);
  }
  
  bool CWallet::DelAddressBook(const CTxDestination& address)
  {
      {
          LOCK(cs_wallet); // mapAddressBook
  
          if(fFileBacked)
          {
              // Delete destdata tuples associated with address
              std::string strAddress = CBitcoinAddress(address).ToString();
              BOOST_FOREACH(const PAIRTYPE(string, string) &item, mapAddressBook[address].destdata)
              {
                  CWalletDB(strWalletFile).EraseDestData(strAddress, item.first);
              }
          }
          mapAddressBook.erase(address);
      }
  
      NotifyAddressBookChanged(this, address, "", ::IsMine(*this, address) != ISMINE_NO, "", CT_DELETED);
  
      if (!fFileBacked)
          return false;
      CWalletDB(strWalletFile).ErasePurpose(CBitcoinAddress(address).ToString());
      return CWalletDB(strWalletFile).EraseName(CBitcoinAddress(address).ToString());
  }
  
  bool CWallet::SetDefaultKey(const CPubKey &vchPubKey)
  {
      if (fFileBacked)
      {
          if (!CWalletDB(strWalletFile).WriteDefaultKey(vchPubKey))
              return false;
      }
      vchDefaultKey = vchPubKey;
      return true;
  }
  
  /**
   * Mark old keypool keys as used,
   * and generate all new keys 
   */
  bool CWallet::NewKeyPool()
  {
      {
          LOCK(cs_wallet);
          CWalletDB walletdb(strWalletFile);
          BOOST_FOREACH(int64_t nIndex, setKeyPool)
              walletdb.ErasePool(nIndex);
          setKeyPool.clear();
  
          if (IsLocked())
              return false;
  
          int64_t nKeys = max(GetArg("-keypool", DEFAULT_KEYPOOL_SIZE), (int64_t)0);
          for (int i = 0; i < nKeys; i++)
          {
              int64_t nIndex = i+1;
              walletdb.WritePool(nIndex, CKeyPool(GenerateNewKey()));
              setKeyPool.insert(nIndex);
          }
          LogPrintf("CWallet::NewKeyPool wrote %d new keys\n", nKeys);
      }
      return true;
  }
  
  bool CWallet::TopUpKeyPool(unsigned int kpSize)
  {
      {
          LOCK(cs_wallet);
  
          if (IsLocked())
              return false;
  
          CWalletDB walletdb(strWalletFile);
  
          // Top up key pool
          unsigned int nTargetSize;
          if (kpSize > 0)
              nTargetSize = kpSize;
          else
              nTargetSize = max(GetArg("-keypool", DEFAULT_KEYPOOL_SIZE), (int64_t) 0);
  
          while (setKeyPool.size() < (nTargetSize + 1))
          {
              int64_t nEnd = 1;
              if (!setKeyPool.empty())
                  nEnd = *(--setKeyPool.end()) + 1;
              if (!walletdb.WritePool(nEnd, CKeyPool(GenerateNewKey())))
                  throw runtime_error("TopUpKeyPool(): writing generated key failed");
              setKeyPool.insert(nEnd);
              LogPrintf("keypool added key %d, size=%u\n", nEnd, setKeyPool.size());
          }
      }
      return true;
  }
  
  void CWallet::ReserveKeyFromKeyPool(int64_t& nIndex, CKeyPool& keypool)
  {
      nIndex = -1;
      keypool.vchPubKey = CPubKey();
      {
          LOCK(cs_wallet);
  
          if (!IsLocked())
              TopUpKeyPool();
  
          // Get the oldest key
          if(setKeyPool.empty())
              return;
  
          CWalletDB walletdb(strWalletFile);
  
          nIndex = *(setKeyPool.begin());
          setKeyPool.erase(setKeyPool.begin());
          if (!walletdb.ReadPool(nIndex, keypool))
              throw runtime_error("ReserveKeyFromKeyPool(): read failed");
          if (!HaveKey(keypool.vchPubKey.GetID()))
              throw runtime_error("ReserveKeyFromKeyPool(): unknown key in key pool");
          assert(keypool.vchPubKey.IsValid());
          LogPrintf("keypool reserve %d\n", nIndex);
      }
  }
  
  void CWallet::KeepKey(int64_t nIndex)
  {
      // Remove from key pool
      if (fFileBacked)
      {
          CWalletDB walletdb(strWalletFile);
          walletdb.ErasePool(nIndex);
      }
      LogPrintf("keypool keep %d\n", nIndex);
  }
  
  void CWallet::ReturnKey(int64_t nIndex)
  {
      // Return to key pool
      {
          LOCK(cs_wallet);
          setKeyPool.insert(nIndex);
      }
      LogPrintf("keypool return %d\n", nIndex);
  }
  
  bool CWallet::GetKeyFromPool(CPubKey& result)
  {
      int64_t nIndex = 0;
      CKeyPool keypool;
      {
          LOCK(cs_wallet);
          ReserveKeyFromKeyPool(nIndex, keypool);
          if (nIndex == -1)
          {
              if (IsLocked()) return false;
              result = GenerateNewKey();
              return true;
          }
          KeepKey(nIndex);
          result = keypool.vchPubKey;
      }
      return true;
  }
  
  int64_t CWallet::GetOldestKeyPoolTime()
  {
      int64_t nIndex = 0;
      CKeyPool keypool;
      ReserveKeyFromKeyPool(nIndex, keypool);
      if (nIndex == -1)
          return GetTime();
      ReturnKey(nIndex);
      return keypool.nTime;
  }
  
  std::map<CTxDestination, CAmount> CWallet::GetAddressBalances()
  {
      map<CTxDestination, CAmount> balances;
  
      {
          LOCK(cs_wallet);
          BOOST_FOREACH(PAIRTYPE(uint256, CWalletTx) walletEntry, mapWallet)
          {
              CWalletTx *pcoin = &walletEntry.second;
  
              if (!CheckFinalTx(*pcoin) || !pcoin->IsTrusted())
                  continue;
  
              if (pcoin->IsCoinBase() && pcoin->GetBlocksToMaturity() > 0)
                  continue;
  
              int nDepth = pcoin->GetDepthInMainChain();
              if (nDepth < (pcoin->IsFromMe(ISMINE_ALL) ? 0 : 1))
                  continue;
  
              for (unsigned int i = 0; i < pcoin->vout.size(); i++)
              {
                  CTxDestination addr;
                  if (!IsMine(pcoin->vout[i]))
                      continue;
                  if(!ExtractDestination(pcoin->vout[i].scriptPubKey, addr))
                      continue;
  
                  CAmount n = IsSpent(walletEntry.first, i) ? 0 : pcoin->vout[i].nValue;
  
                  if (!balances.count(addr))
                      balances[addr] = 0;
                  balances[addr] += n;
              }
          }
      }
  
      return balances;
  }
  
  set< set<CTxDestination> > CWallet::GetAddressGroupings()
  {
      AssertLockHeld(cs_wallet); // mapWallet
      set< set<CTxDestination> > groupings;
      set<CTxDestination> grouping;
  
      BOOST_FOREACH(PAIRTYPE(uint256, CWalletTx) walletEntry, mapWallet)
      {
          CWalletTx *pcoin = &walletEntry.second;
  
          if (pcoin->vin.size() > 0)
          {
              bool any_mine = false;
              // group all input addresses with each other
              BOOST_FOREACH(CTxIn txin, pcoin->vin)
              {
                  CTxDestination address;
                  if(!IsMine(txin)) /* If this input isn't mine, ignore it */
                      continue;
                  if(!ExtractDestination(mapWallet[txin.prevout.hash].vout[txin.prevout.n].scriptPubKey, address))
                      continue;
                  grouping.insert(address);
                  any_mine = true;
              }
  
              // group change with input addresses
              if (any_mine)
              {
                 BOOST_FOREACH(CTxOut txout, pcoin->vout)
                     if (IsChange(txout))
                     {
                         CTxDestination txoutAddr;
                         if(!ExtractDestination(txout.scriptPubKey, txoutAddr))
                             continue;
                         grouping.insert(txoutAddr);
                     }
              }
              if (grouping.size() > 0)
              {
                  groupings.insert(grouping);
                  grouping.clear();
              }
          }
  
          // group lone addrs by themselves
          for (unsigned int i = 0; i < pcoin->vout.size(); i++)
              if (IsMine(pcoin->vout[i]))
              {
                  CTxDestination address;
                  if(!ExtractDestination(pcoin->vout[i].scriptPubKey, address))
                      continue;
                  grouping.insert(address);
                  groupings.insert(grouping);
                  grouping.clear();
              }
      }
  
      set< set<CTxDestination>* > uniqueGroupings; // a set of pointers to groups of addresses
      map< CTxDestination, set<CTxDestination>* > setmap;  // map addresses to the unique group containing it
      BOOST_FOREACH(set<CTxDestination> grouping, groupings)
      {
          // make a set of all the groups hit by this new group
          set< set<CTxDestination>* > hits;
          map< CTxDestination, set<CTxDestination>* >::iterator it;
          BOOST_FOREACH(CTxDestination address, grouping)
              if ((it = setmap.find(address)) != setmap.end())
                  hits.insert((*it).second);
  
          // merge all hit groups into a new single group and delete old groups
          set<CTxDestination>* merged = new set<CTxDestination>(grouping);
          BOOST_FOREACH(set<CTxDestination>* hit, hits)
          {
              merged->insert(hit->begin(), hit->end());
              uniqueGroupings.erase(hit);
              delete hit;
          }
          uniqueGroupings.insert(merged);
  
          // update setmap
          BOOST_FOREACH(CTxDestination element, *merged)
              setmap[element] = merged;
      }
  
      set< set<CTxDestination> > ret;
      BOOST_FOREACH(set<CTxDestination>* uniqueGrouping, uniqueGroupings)
      {
          ret.insert(*uniqueGrouping);
          delete uniqueGrouping;
      }
  
      return ret;
  }
  
  std::set<CTxDestination> CWallet::GetAccountAddresses(const std::string& strAccount) const
  {
      LOCK(cs_wallet);
      set<CTxDestination> result;
      BOOST_FOREACH(const PAIRTYPE(CTxDestination, CAddressBookData)& item, mapAddressBook)
      {
          const CTxDestination& address = item.first;
          const string& strName = item.second.name;
          if (strName == strAccount)
              result.insert(address);
      }
      return result;
  }
  
  bool CReserveKey::GetReservedKey(CPubKey& pubkey)
  {
      if (nIndex == -1)
      {
          CKeyPool keypool;
          pwallet->ReserveKeyFromKeyPool(nIndex, keypool);
          if (nIndex != -1)
              vchPubKey = keypool.vchPubKey;
          else {
              return false;
          }
      }
      assert(vchPubKey.IsValid());
      pubkey = vchPubKey;
      return true;
  }
  
  void CReserveKey::KeepKey()
  {
      if (nIndex != -1)
          pwallet->KeepKey(nIndex);
      nIndex = -1;
      vchPubKey = CPubKey();
  }
  
  void CReserveKey::ReturnKey()
  {
      if (nIndex != -1)
          pwallet->ReturnKey(nIndex);
      nIndex = -1;
      vchPubKey = CPubKey();
  }
  
  void CWallet::GetAllReserveKeys(set<CKeyID>& setAddress) const
  {
      setAddress.clear();
  
      CWalletDB walletdb(strWalletFile);
  
      LOCK2(cs_main, cs_wallet);
      BOOST_FOREACH(const int64_t& id, setKeyPool)
      {
          CKeyPool keypool;
          if (!walletdb.ReadPool(id, keypool))
              throw runtime_error("GetAllReserveKeyHashes(): read failed");
          assert(keypool.vchPubKey.IsValid());
          CKeyID keyID = keypool.vchPubKey.GetID();
          if (!HaveKey(keyID))
              throw runtime_error("GetAllReserveKeyHashes(): unknown key in key pool");
          setAddress.insert(keyID);
      }
  }
  
  void CWallet::UpdatedTransaction(const uint256 &hashTx)
  {
      {
          LOCK(cs_wallet);
          // Only notify UI if this transaction is in this wallet
          map<uint256, CWalletTx>::const_iterator mi = mapWallet.find(hashTx);
          if (mi != mapWallet.end())
              NotifyTransactionChanged(this, hashTx, CT_UPDATED);
      }
  }
  
  void CWallet::GetScriptForMining(boost::shared_ptr<CReserveScript> &script)
  {
      boost::shared_ptr<CReserveKey> rKey(new CReserveKey(this));
      CPubKey pubkey;
      if (!rKey->GetReservedKey(pubkey))
          return;
  
      script = rKey;
      script->reserveScript = CScript() << ToByteVector(pubkey) << OP_CHECKSIG;
  }
  
  void CWallet::LockCoin(COutPoint& output)
  {
      AssertLockHeld(cs_wallet); // setLockedCoins
      setLockedCoins.insert(output);
  }
  
  void CWallet::UnlockCoin(COutPoint& output)
  {
      AssertLockHeld(cs_wallet); // setLockedCoins
      setLockedCoins.erase(output);
  }
  
  void CWallet::UnlockAllCoins()
  {
      AssertLockHeld(cs_wallet); // setLockedCoins
      setLockedCoins.clear();
  }
  
  bool CWallet::IsLockedCoin(uint256 hash, unsigned int n) const
  {
      AssertLockHeld(cs_wallet); // setLockedCoins
      COutPoint outpt(hash, n);
  
      return (setLockedCoins.count(outpt) > 0);
  }
  
  void CWallet::ListLockedCoins(std::vector<COutPoint>& vOutpts)
  {
      AssertLockHeld(cs_wallet); // setLockedCoins
      for (std::set<COutPoint>::iterator it = setLockedCoins.begin();
           it != setLockedCoins.end(); it++) {
          COutPoint outpt = (*it);
          vOutpts.push_back(outpt);
      }
  }
  
  /** @} */ // end of Actions
  
  class CAffectedKeysVisitor : public boost::static_visitor<void> {
  private:
      const CKeyStore &keystore;
      std::vector<CKeyID> &vKeys;
  
  public:
      CAffectedKeysVisitor(const CKeyStore &keystoreIn, std::vector<CKeyID> &vKeysIn) : keystore(keystoreIn), vKeys(vKeysIn) {}
  
      void Process(const CScript &script) {
          txnouttype type;
          std::vector<CTxDestination> vDest;
          int nRequired;
          if (ExtractDestinations(script, type, vDest, nRequired)) {
              BOOST_FOREACH(const CTxDestination &dest, vDest)
                  boost::apply_visitor(*this, dest);
          }
      }
  
      void operator()(const CKeyID &keyId) {
          if (keystore.HaveKey(keyId))
              vKeys.push_back(keyId);
      }
  
      void operator()(const CScriptID &scriptId) {
          CScript script;
          if (keystore.GetCScript(scriptId, script))
              Process(script);
      }
  
      void operator()(const CNoDestination &none) {}
  };
  
  void CWallet::GetKeyBirthTimes(std::map<CKeyID, int64_t> &mapKeyBirth) const {
      AssertLockHeld(cs_wallet); // mapKeyMetadata
      mapKeyBirth.clear();
  
      // get birth times for keys with metadata
      for (std::map<CKeyID, CKeyMetadata>::const_iterator it = mapKeyMetadata.begin(); it != mapKeyMetadata.end(); it++)
          if (it->second.nCreateTime)
              mapKeyBirth[it->first] = it->second.nCreateTime;
  
      // map in which we'll infer heights of other keys
      CBlockIndex *pindexMax = chainActive[std::max(0, chainActive.Height() - 144)]; // the tip can be reorganised; use a 144-block safety margin
      std::map<CKeyID, CBlockIndex*> mapKeyFirstBlock;
      std::set<CKeyID> setKeys;
      GetKeys(setKeys);
      BOOST_FOREACH(const CKeyID &keyid, setKeys) {
          if (mapKeyBirth.count(keyid) == 0)
              mapKeyFirstBlock[keyid] = pindexMax;
      }
      setKeys.clear();
  
      // if there are no such keys, we're done
      if (mapKeyFirstBlock.empty())
          return;
  
      // find first block that affects those keys, if there are any left
      std::vector<CKeyID> vAffected;
      for (std::map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); it++) {
          // iterate over all wallet transactions...
          const CWalletTx &wtx = (*it).second;
          BlockMap::const_iterator blit = mapBlockIndex.find(wtx.hashBlock);
          if (blit != mapBlockIndex.end() && chainActive.Contains(blit->second)) {
              // ... which are already in a block
              int nHeight = blit->second->nHeight;
              BOOST_FOREACH(const CTxOut &txout, wtx.vout) {
                  // iterate over all their outputs
                  CAffectedKeysVisitor(*this, vAffected).Process(txout.scriptPubKey);
                  BOOST_FOREACH(const CKeyID &keyid, vAffected) {
                      // ... and all their affected keys
                      std::map<CKeyID, CBlockIndex*>::iterator rit = mapKeyFirstBlock.find(keyid);
                      if (rit != mapKeyFirstBlock.end() && nHeight < rit->second->nHeight)
                          rit->second = blit->second;
                  }
                  vAffected.clear();
              }
          }
      }
  
      // Extract block timestamps for those keys
      for (std::map<CKeyID, CBlockIndex*>::const_iterator it = mapKeyFirstBlock.begin(); it != mapKeyFirstBlock.end(); it++)
          mapKeyBirth[it->first] = it->second->GetBlockTime() - 7200; // block times can be 2h off
  }
  
  bool CWallet::AddDestData(const CTxDestination &dest, const std::string &key, const std::string &value)
  {
      if (boost::get<CNoDestination>(&dest))
          return false;
  
      mapAddressBook[dest].destdata.insert(std::make_pair(key, value));
      if (!fFileBacked)
          return true;
      return CWalletDB(strWalletFile).WriteDestData(CBitcoinAddress(dest).ToString(), key, value);
  }
  
  bool CWallet::EraseDestData(const CTxDestination &dest, const std::string &key)
  {
      if (!mapAddressBook[dest].destdata.erase(key))
          return false;
      if (!fFileBacked)
          return true;
      return CWalletDB(strWalletFile).EraseDestData(CBitcoinAddress(dest).ToString(), key);
  }
  
  bool CWallet::LoadDestData(const CTxDestination &dest, const std::string &key, const std::string &value)
  {
      mapAddressBook[dest].destdata.insert(std::make_pair(key, value));
      return true;
  }
  
  bool CWallet::GetDestData(const CTxDestination &dest, const std::string &key, std::string *value) const
  {
      std::map<CTxDestination, CAddressBookData>::const_iterator i = mapAddressBook.find(dest);
      if(i != mapAddressBook.end())
      {
          CAddressBookData::StringMap::const_iterator j = i->second.destdata.find(key);
          if(j != i->second.destdata.end())
          {
              if(value)
                  *value = j->second;
              return true;
          }
      }
      return false;
  }
  
  CKeyPool::CKeyPool()
  {
      nTime = GetTime();
  }
  
  CKeyPool::CKeyPool(const CPubKey& vchPubKeyIn)
  {
      nTime = GetTime();
      vchPubKey = vchPubKeyIn;
  }
  
  CWalletKey::CWalletKey(int64_t nExpires)
  {
      nTimeCreated = (nExpires ? GetTime() : 0);
      nTimeExpires = nExpires;
  }
  
  int CMerkleTx::SetMerkleBranch(const CBlock& block)
  {
      AssertLockHeld(cs_main);
      CBlock blockTmp;
  
      // Update the tx's hashBlock
      hashBlock = block.GetHash();
  
      // Locate the transaction
      for (nIndex = 0; nIndex < (int)block.vtx.size(); nIndex++)
          if (block.vtx[nIndex] == *(CTransaction*)this)
              break;
      if (nIndex == (int)block.vtx.size())
      {
          nIndex = -1;
          LogPrintf("ERROR: SetMerkleBranch(): couldn't find tx in block\n");
          return 0;
      }
  
      // Is the tx in a block that's in the main chain
      BlockMap::iterator mi = mapBlockIndex.find(hashBlock);
      if (mi == mapBlockIndex.end())
          return 0;
      const CBlockIndex* pindex = (*mi).second;
      if (!pindex || !chainActive.Contains(pindex))
          return 0;
  
      return chainActive.Height() - pindex->nHeight + 1;
  }
  
  int CMerkleTx::GetDepthInMainChain(const CBlockIndex* &pindexRet) const
  {
      if (hashBlock.IsNull())
          return 0;
      AssertLockHeld(cs_main);
  
      // Find the block it claims to be in
      BlockMap::iterator mi = mapBlockIndex.find(hashBlock);
      if (mi == mapBlockIndex.end())
          return 0;
      CBlockIndex* pindex = (*mi).second;
      if (!pindex || !chainActive.Contains(pindex))
          return 0;
  
      pindexRet = pindex;
      return ((nIndex == -1) ? (-1) : 1) * (chainActive.Height() - pindex->nHeight + 1);
  }
  
  int CMerkleTx::GetBlocksToMaturity() const
  {
      if (!IsCoinBase())
          return 0;
      return max(0, (COINBASE_MATURITY+1) - GetDepthInMainChain());
  }
  
  
  bool CMerkleTx::AcceptToMemoryPool(bool fLimitFree, bool fRejectAbsurdFee)
  {
      CValidationState state;
      return ::AcceptToMemoryPool(mempool, state, *this, fLimitFree, NULL, false, fRejectAbsurdFee);
  }
  
  