text: // Copyright (c) 2009-2010 Satoshi Nakamoto
  // Copyright (c) 2009-2015 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 "ui_interface.h"
  #include "utilmoneystr.h"
  #include "validation.h"
  #include "darksend.h"
  #include "instantx.h"
  #include "noirnode.h"
  #include "noirnode-sync.h"
  #include "zerocoin.h"
  //#include "random.h"
  
  #include <assert.h>
  #include <boost/algorithm/string/replace.hpp>
  #include <boost/filesystem.hpp>
  #include <boost/thread.hpp>
  
  using namespace std;
  
  CWallet *pwalletMain = NULL;
  /** Transaction fee set by the user */
  CFeeRate payTxFee(DEFAULT_TRANSACTION_FEE);
  unsigned int nTxConfirmTarget = DEFAULT_TX_CONFIRM_TARGET;
  bool bSpendZeroConfChange = DEFAULT_SPEND_ZEROCONF_CHANGE;
  bool fSendFreeTransactions = DEFAULT_SEND_FREE_TRANSACTIONS;
  
  const char *DEFAULT_WALLET_DAT = "wallet.dat";
  const uint32_t BIP32_HARDENED_KEY_LIMIT = 0x80000000;
  
  /**
   * Fees smaller than this (in satoshi) are considered zero fee (for transaction creation)
   * Override with -mintxfee
   */
  CFeeRate CWallet::minTxFee = CFeeRate(DEFAULT_TRANSACTION_MINFEE);
  /**
   * If fee estimation does not have enough data to provide estimates, use this fee instead.
   * Has no effect if not using fee estimation
   * Override with -fallbackfee
   */
  CFeeRate CWallet::fallbackFee = CFeeRate(DEFAULT_FALLBACK_FEE);
  
  const uint256 CMerkleTx::ABANDON_HASH(uint256S("0000000000000000000000000000000000000000000000000000000000000001"));
  
  /** @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;
      }
  };
  
  struct CompareByPriority
  {
      bool operator()(const COutput& t1,
                      const COutput& t2) const
      {
          return t1.Priority() > t2.Priority();
      }
  };
  
  struct CompareByAmount
  {
      bool operator()(const CompactTallyItem& t1, const CompactTallyItem& t2) const
      {
          return t1.nAmount > t2.nAmount;
      }
  };
  
  int COutput::Priority() const
  {
      BOOST_FOREACH(CAmount d, vecPrivateSendDenominations)
      if(tx->vout[i].nValue == d) return 10000;
      if(tx->vout[i].nValue < 1*COIN) return 20000;
  
      //nondenom return largest first
      return -(tx->vout[i].nValue/COIN);
  }
  
  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;
  
      // Create new metadata
      int64_t nCreationTime = GetTime();
      CKeyMetadata metadata(nCreationTime);
  
      // use HD key derivation if HD was enabled during wallet creation
      if (!hdChain.masterKeyID.IsNull()) {
          // for now we use a fixed keypath scheme of m/0'/0'/k
          CKey key;                      //master key seed (256bit)
          CExtKey masterKey;             //hd master key
          CExtKey accountKey;            //key at m/0'
          CExtKey externalChainChildKey; //key at m/0'/0'
          CExtKey childKey;              //key at m/0'/0'/<n>'
  
          // try to get the master key
          if (!GetKey(hdChain.masterKeyID, key))
              throw std::runtime_error(std::string(__func__) + ": Master key not found");
  
          masterKey.SetMaster(key.begin(), key.size());
  
          // derive m/0'
          // use hardened derivation (child keys >= 0x80000000 are hardened after bip32)
          masterKey.Derive(accountKey, BIP32_HARDENED_KEY_LIMIT);
  
          // derive m/0'/0'
          accountKey.Derive(externalChainChildKey, BIP32_HARDENED_KEY_LIMIT);
  
          // derive child key at next index, skip keys already known to the wallet
          do {
              // always derive hardened keys
              // childIndex | BIP32_HARDENED_KEY_LIMIT = derive childIndex in hardened child-index-range
              // example: 1 | BIP32_HARDENED_KEY_LIMIT == 0x80000001 == 2147483649
              externalChainChildKey.Derive(childKey, hdChain.nExternalChainCounter | BIP32_HARDENED_KEY_LIMIT);
              metadata.hdKeypath = "m/0'/0'/" + std::to_string(hdChain.nExternalChainCounter) + "'";
              metadata.hdMasterKeyID = hdChain.masterKeyID;
              // increment childkey index
              hdChain.nExternalChainCounter++;
          } while (HaveKey(childKey.key.GetPubKey().GetID()));
          secret = childKey.key;
  
          // update the chain model in the database
          if (!CWalletDB(strWalletFile).WriteHDChain(hdChain))
              throw std::runtime_error(std::string(__func__) + ": Writing HD chain model failed");
      } else {
          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));
  
      mapKeyMetadata[pubkey.GetID()] = metadata;
      if (!nTimeFirstKey || nCreationTime < nTimeFirstKey)
          nTimeFirstKey = nCreationTime;
  
      if (!AddKeyPubKey(secret, pubkey))
          throw std::runtime_error(std::string(__func__) + ": 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() {
      LogPrintf("Using BerkeleyDB version %s\n", DbEnv::version(0, 0, 0));
      std::string walletFile = GetArg("-wallet", DEFAULT_WALLET_DAT);
  
      LogPrintf("Using wallet %s\n", walletFile);
      uiInterface.InitMessage(_("Verifying wallet..."));
  
      // Wallet file must be a plain filename without a directory
      if (walletFile != boost::filesystem::basename(walletFile) + boost::filesystem::extension(walletFile))
          return InitError(
                  strprintf(_("Wallet %s resides outside data directory %s"), walletFile, GetDataDir().string()));
  
      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
              return InitError(strprintf(_("Error initializing wallet database environment %s!"), GetDataDir()));
          }
      }
  
      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) {
              InitWarning(strprintf(_("Warning: Wallet file corrupt, data salvaged!"
                                              " Original %s saved as %s in %s; if"
                                              " your balance or transactions are incorrect you should"
                                              " restore from a backup."),
                                    walletFile, "wallet.{timestamp}.bak", GetDataDir()));
          }
          if (r == CDBEnv::RECOVER_FAIL)
              return InitError(strprintf(_("%s corrupt, salvage failed"), walletFile));
      }
      LogPrintf("Verify wallet ok!");
      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()) {
              int depth = mit->second.GetDepthInMainChain();
              if (depth > 0 || (depth == 0 && !mit->second.isAbandoned()))
                  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() || thisTx.IsZerocoinSpend()) // 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;
  
      vMasterKey.resize(WALLET_CRYPTO_KEY_SIZE);
      GetStrongRandBytes(&vMasterKey[0], WALLET_CRYPTO_KEY_SIZE);
  
      CMasterKey kMasterKey;
  
      kMasterKey.vchSalt.resize(WALLET_CRYPTO_SALT_SIZE);
      GetStrongRandBytes(&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);
  
          // if we are using HD, replace the HD master key (seed) with a new one
          if (!hdChain.masterKeyID.IsNull()) {
              CKey key;
              CPubKey masterPubKey = GenerateNewHDMasterKey();
              if (!SetHDMasterKey(masterPubKey))
                  return false;
          }
  
          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;
  }
  
  bool CWallet::AccountMove(std::string strFrom, std::string strTo, CAmount nAmount, std::string strComment) {
      CWalletDB walletdb(strWalletFile);
      if (!walletdb.TxnBegin())
          return false;
  
      int64_t nNow = GetAdjustedTime();
  
      // Debit
      CAccountingEntry debit;
      debit.nOrderPos = IncOrderPosNext(&walletdb);
      debit.strAccount = strFrom;
      debit.nCreditDebit = -nAmount;
      debit.nTime = nNow;
      debit.strOtherAccount = strTo;
      debit.strComment = strComment;
      AddAccountingEntry(debit, walletdb);
  
      // Credit
      CAccountingEntry credit;
      credit.nOrderPos = IncOrderPosNext(&walletdb);
      credit.strAccount = strTo;
      credit.nCreditDebit = nAmount;
      credit.nTime = nNow;
      credit.strOtherAccount = strFrom;
      credit.strComment = strComment;
      AddAccountingEntry(credit, walletdb);
  
      if (!walletdb.TxnCommit())
          return false;
  
      return true;
  }
  
  bool CWallet::GetAccountPubkey(CPubKey &pubKey, std::string strAccount, bool bForceNew) {
      CWalletDB walletdb(strWalletFile);
  
      CAccount account;
      walletdb.ReadAccount(strAccount, account);
  
      if (!bForceNew) {
          if (!account.vchPubKey.IsValid())
              bForceNew = true;
          else {
              // Check if the current key has been used
              CScript scriptPubKey = GetScriptForDestination(account.vchPubKey.GetID());
              for (map<uint256, CWalletTx>::iterator it = mapWallet.begin();
                   it != mapWallet.end() && account.vchPubKey.IsValid();
                   ++it)
                  BOOST_FOREACH(const CTxOut &txout, (*it).second.vout)
              if (txout.scriptPubKey == scriptPubKey) {
                  bForceNew = true;
                  break;
              }
          }
      }
  
      // Generate a new key
      if (bForceNew) {
          if (!GetKeyFromPool(account.vchPubKey))
              return false;
  
          SetAddressBook(account.vchPubKey.GetID(), strAccount, "receive");
          walletdb.WriteAccount(strAccount, account);
      }
  
      pubKey = account.vchPubKey;
  
      return true;
  }
  
  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) {
      LogPrintf("CWallet::AddToWallet\n");
      uint256 hash = wtxIn.GetHash();
      LogPrintf("hash=%s\n", hash.ToString());
      if (fFromLoadWallet) {
          mapWallet[hash] = wtxIn;
          CWalletTx &wtx = mapWallet[hash];
          wtx.BindWallet(this);
  //        if (!wtx.IsZerocoinSpend()) {
          wtxOrdered.insert(make_pair(wtx.nOrderPos, TxPair(&wtx, (CAccountingEntry *) 0)));
          AddToSpends(hash);
  //            BOOST_FOREACH(const CTxIn &txin, wtx.vin) {
  //                LogPrintf("txin.prevout.hash=%s\n", txin.prevout.hash.ToString());
  //                if (mapWallet.count(txin.prevout.hash)) {
  //                    CWalletTx &prevtx = mapWallet[txin.prevout.hash];
  //                    if (prevtx.nIndex == -1 && !prevtx.hashUnset()) {
  //                        LogPrintf("Enter\n");
  //                        MarkConflicted(prevtx.hashBlock, wtx.GetHash());
  //                        LogPrintf("Out\n");
  //                    }
  //                }
  //            }
  //        }
      } 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.hashUnset()) {
                  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.hashUnset() && wtxIn.hashBlock != wtx.hashBlock) {
                  wtx.hashBlock = wtxIn.hashBlock;
                  fUpdated = true;
              }
              // If no longer abandoned, update
              if (wtxIn.hashBlock.IsNull() && wtx.isAbandoned()) {
                  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 (!pwalletdb->WriteTx(wtx))
                  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
          }
  
      }
      LogPrintf("CWallet::AddToWallet -> ok\n");
      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) {
      {
  //        LogPrintf("CWallet::AddToWalletIfInvolvingMe, tx=%s\n", tx.GetHash().ToString());
          AssertLockHeld(cs_wallet);
  //        if (!tx.IsZerocoinSpend() && 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);
          }
      }
  //    LogPrintf("CWallet::AddToWalletIfInvolvingMe -> out false!\n");
      return false;
  }
  
  bool CWallet::AbandonTransaction(const uint256 &hashTx) {
      LOCK2(cs_main, cs_wallet);
  
      // Do not flush the wallet here for performance reasons
      CWalletDB walletdb(strWalletFile, "r+", false);
  
      std::set <uint256> todo;
      std::set <uint256> done;
  
      // Can't mark abandoned if confirmed or in mempool
      assert(mapWallet.count(hashTx));
      CWalletTx &origtx = mapWallet[hashTx];
      if (origtx.GetDepthInMainChain() > 0 || origtx.InMempool()) {
          return false;
      }
  
      todo.insert(hashTx);
  
      while (!todo.empty()) {
          uint256 now = *todo.begin();
          todo.erase(now);
          done.insert(now);
          assert(mapWallet.count(now));
          CWalletTx &wtx = mapWallet[now];
          int currentconfirm = wtx.GetDepthInMainChain();
          // If the orig tx was not in block, none of its spends can be
          assert(currentconfirm <= 0);
          // if (currentconfirm < 0) {Tx and spends are already conflicted, no need to abandon}
          if (currentconfirm == 0 && !wtx.isAbandoned()) {
              // If the orig tx was not in block/mempool, none of its spends can be in mempool
              assert(!wtx.InMempool());
              wtx.nIndex = -1;
              wtx.setAbandoned();
              wtx.MarkDirty();
              walletdb.WriteTx(wtx);
              NotifyTransactionChanged(this, wtx.GetHash(), CT_UPDATED);
              // Iterate over all its outputs, and mark transactions in the wallet that spend them abandoned too
              TxSpends::const_iterator iter = mapTxSpends.lower_bound(COutPoint(hashTx, 0));
              while (iter != mapTxSpends.end() && iter->first.hash == now) {
                  if (!done.count(iter->second)) {
                      todo.insert(iter->second);
                  }
                  iter++;
              }
              // If a transaction changes 'conflicted' state, that changes the balance
              // available of the outputs it spends. So force those to be recomputed
              BOOST_FOREACH(const CTxIn &txin, wtx.vin)
              {
                  if (mapWallet.count(txin.prevout.hash))
                      mapWallet[txin.prevout.hash].MarkDirty();
              }
          }
          if (wtx.IsZerocoinSpend()) {
              // find out coin serial number
              assert(wtx.vin.size() == 1);
               const CTxIn &txin = wtx.vin[0];
              CDataStream serializedCoinSpend((const char *)&*(txin.scriptSig.begin() + 4),
                                              (const char *)&*txin.scriptSig.end(),
                                              SER_NETWORK, PROTOCOL_VERSION);
              libzerocoin::CoinSpend spend(txin.nSequence >= ZC_MODULUS_V2_BASE_ID ? ZCParamsV2 : ZCParams,
                                           serializedCoinSpend);
               CBigNum serial = spend.getCoinSerialNumber();
               // mark corresponding mint as unspent
              list <CZerocoinEntry> pubCoins;
              walletdb.ListPubCoin(pubCoins);
               BOOST_FOREACH(const CZerocoinEntry &zerocoinItem, pubCoins) {
                  if (zerocoinItem.serialNumber == serial) {
                      CZerocoinEntry modifiedItem = zerocoinItem;
                      modifiedItem.IsUsed = false;
                      pwalletMain->NotifyZerocoinChanged(pwalletMain, zerocoinItem.value.GetHex(),
                                                         std::string("New (") + std::to_string(zerocoinItem.denomination) + "mint)",
                                                         CT_UPDATED);
                      walletdb.WriteZerocoinEntry(modifiedItem);
                       // erase zerocoin spend entry
                      CZerocoinSpendEntry spendEntry;
                      spendEntry.coinSerial = serial;
                      walletdb.EraseCoinSpendSerialEntry(spendEntry);
                  }
              }
           }
      }
  
      return true;
  }
  
  void CWallet::MarkConflicted(const uint256 &hashBlock, const uint256 &hashTx) {
      LOCK2(cs_main, cs_wallet);
  
      int conflictconfirms = 0;
      if (mapBlockIndex.count(hashBlock)) {
          CBlockIndex *pindex = mapBlockIndex[hashBlock];
          if (chainActive.Contains(pindex)) {
              conflictconfirms = -(chainActive.Height() - pindex->nHeight + 1);
          }
      }
      // If number of conflict confirms cannot be determined, this means
      // that the block is still unknown or not yet part of the main chain,
      // for example when loading the wallet during a reindex. Do nothing in that
      // case.
      if (conflictconfirms >= 0)
          return;
  
      // Do not flush the wallet here for performance reasons
      CWalletDB walletdb(strWalletFile, "r+", false);
  
      std::set <uint256> todo;
      std::set <uint256> done;
  
      todo.insert(hashTx);
  
      while (!todo.empty()) {
          uint256 now = *todo.begin();
          todo.erase(now);
          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();
              walletdb.WriteTx(wtx);
              // 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.insert(iter->second);
                  }
                  iter++;
              }
              // If a transaction changes 'conflicted' state, that changes the balance
              // available of the outputs it spends. So force those to be recomputed
              BOOST_FOREACH(const CTxIn &txin, wtx.vin)
              {
                  if (mapWallet.count(txin.prevout.hash))
                      mapWallet[txin.prevout.hash].MarkDirty();
              }
          }
      }
  }
  
  void CWallet::SyncTransaction(const CTransaction &tx, const CBlockIndex *pindex, const CBlock *pblock) {
  //    LogPrintf("SyncTransaction()\n");
      LOCK2(cs_main, cs_wallet);
  
      if (!AddToWalletIfInvolvingMe(tx, pblock, true)) {
  //        LogPrintf("Not mine!\n");
          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(std::string(__func__) + ": 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(std::string(__func__) + ": 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) && txout.nValue >= nMinimumInputValue)
          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(std::string(__func__) + ": 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(std::string(__func__) + ": 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(std::string(__func__) + ": value out of range");
      }
      return nChange;
  }
  
  CPubKey CWallet::GenerateNewHDMasterKey() {
      CKey key;
      key.MakeNewKey(true);
  
      int64_t nCreationTime = GetTime();
      CKeyMetadata metadata(nCreationTime);
  
      // calculate the pubkey
      CPubKey pubkey = key.GetPubKey();
      assert(key.VerifyPubKey(pubkey));
  
      // set the hd keypath to "m" -> Master, refers the masterkeyid to itself
      metadata.hdKeypath = "m";
      metadata.hdMasterKeyID = pubkey.GetID();
  
      {
          LOCK(cs_wallet);
  
          // mem store the metadata
          mapKeyMetadata[pubkey.GetID()] = metadata;
  
          // write the key&metadata to the database
          if (!AddKeyPubKey(key, pubkey))
              throw std::runtime_error(std::string(__func__) + ": AddKeyPubKey failed");
      }
  
      return pubkey;
  }
  
  bool CWallet::SetHDMasterKey(const CPubKey &pubkey) {
      LOCK(cs_wallet);
  
      // ensure this wallet.dat can only be opened by clients supporting HD
      SetMinVersion(FEATURE_HD);
  
      // store the keyid (hash160) together with
      // the child index counter in the database
      // as a hdchain object
      CHDChain newHdChain;
      newHdChain.masterKeyID = pubkey.GetID();
      SetHDChain(newHdChain, false);
  
      return true;
  }
  
  bool CWallet::SetHDChain(const CHDChain &chain, bool memonly) {
      LOCK(cs_wallet);
      if (!memonly && !CWalletDB(strWalletFile).WriteHDChain(chain))
          throw runtime_error(std::string(__func__) + ": writing chain failed");
  
      hdChain = chain;
      return true;
  }
  
  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 (!hashUnset()) {
                  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 && !hashUnset()) {
                      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) && !txout.scriptPubKey.IsUnspendable()) {
              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;
              }
          }
      }
  }
  
  /**
   * 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() {
      LogPrintf("CWallet::ReacceptWalletTransactions()\n");
      // 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() || wtx.IsZerocoinSpend()) && (nDepth == 0 && !wtx.isAbandoned()))
              continue;
  
          if (nDepth == 0 && !wtx.isAbandoned()) {
              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);
          CValidationState state;
          wtx.AcceptToMemoryPool(false, maxTxFee, state, false);
      }
  }
  
  bool CWalletTx::RelayWalletTransaction(bool fCheckInputs) {
      assert(pwallet->GetBroadcastTransactions());
      if (!IsCoinBase() && !isAbandoned() && GetDepthInMainChain() == 0) {
          CValidationState state;
          /* GetDepthInMainChain already catches known conflicts. */
          if (InMempool() || AcceptToMemoryPool(false, maxTxFee, state, fCheckInputs)) {
              LogPrintf("Relaying wtx %s\n", GetHash().ToString());
              RelayTransaction((CTransaction) * this);
              return true;
          }
      }
  //    LogPrintf("CWalletTx::RelayWalletTransaction() --> invalid condition\n");
      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::InMempool() const {
      LOCK(mempool.cs);
      if (mempool.exists(GetHash())) {
          return true;
      }
      return false;
  }
  
  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.
      if (!InMempool())
          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::GetAnonymizableBalance(bool fSkipDenominated) const {
      if (fLiteMode) return 0;
  
      std::vector <CompactTallyItem> vecTally;
      if (!SelectCoinsGrouppedByAddresses(vecTally, fSkipDenominated)) return 0;
  
      CAmount nTotal = 0;
  
      BOOST_FOREACH(CompactTallyItem & item, vecTally)
      {
          bool fIsDenominated = IsDenominatedAmount(item.nAmount);
          if (fSkipDenominated && fIsDenominated) continue;
          // assume that the fee to create denoms be PRIVATESEND_COLLATERAL at max
          if (item.nAmount >= vecPrivateSendDenominations.back() + (fIsDenominated ? 0 : PRIVATESEND_COLLATERAL))
              nTotal += item.nAmount;
      }
  
      return nTotal;
  }
  
  CAmount CWallet::GetAnonymizedBalance() const {
      if (fLiteMode) return 0;
  
      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 += 0;
  //                nTotal += pcoin->GetAnonymizedCredit();
          }
      }
  
      return nTotal;
  }
  
  CAmount CWalletTx::GetAnonymizedCredit(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 && fAnonymizedCreditCached)
  //        return nAnonymizedCreditCached;
  
      CAmount nCredit = 0;
      uint256 hashTx = GetHash();
      for (unsigned int i = 0; i < vout.size(); i++) {
          const CTxOut &txout = vout[i];
          const CTxIn txin = CTxIn(hashTx, i);
  
          if (pwallet->IsSpent(hashTx, i) || !pwallet->IsDenominated(txin)) continue;
  
  //        const int nRounds = pwallet->GetInputPrivateSendRounds(txin);
          const int nRounds = 0;
          if (nRounds >= nPrivateSendRounds) {
              nCredit += pwallet->GetCredit(txout, ISMINE_SPENDABLE);
              if (!MoneyRange(nCredit))
                  throw std::runtime_error("CWalletTx::GetAnonymizedCredit() : value out of range");
          }
      }
  
  //    nAnonymizedCreditCached = nCredit;
  //    fAnonymizedCreditCached = true;
      return nCredit;
  }
  
  
  CAmount CWallet::GetNeedsToBeAnonymizedBalance(CAmount nMinBalance) const {
      if (fLiteMode) return 0;
  
      CAmount nAnonymizedBalance = GetAnonymizedBalance();
      CAmount nNeedsToAnonymizeBalance = nPrivateSendAmount * COIN - nAnonymizedBalance;
  
      // try to overshoot target DS balance up to nMinBalance
      nNeedsToAnonymizeBalance += nMinBalance;
  
      CAmount nAnonymizableBalance = GetAnonymizableBalance();
  
      // anonymizable balance is way too small
      if (nAnonymizableBalance < nMinBalance) return 0;
  
      // not enough funds to anonymze amount we want, try the max we can
      if (nNeedsToAnonymizeBalance > nAnonymizableBalance) nNeedsToAnonymizeBalance = nAnonymizableBalance;
  
      // we should never exceed the pool max
      if (nNeedsToAnonymizeBalance > PRIVATESEND_POOL_MAX) nNeedsToAnonymizeBalance = PRIVATESEND_POOL_MAX;
  
      return nNeedsToAnonymizeBalance;
  }
  
  CAmount CWallet::GetDenominatedBalance(bool unconfirmed) const {
      if (fLiteMode) return 0;
  
      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->GetDenominatedCredit(unconfirmed);
          }
      }
  
      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 (!pcoin->IsTrusted() && pcoin->GetDepthInMainChain() == 0 && pcoin->InMempool())
                  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 (!pcoin->IsTrusted() && pcoin->GetDepthInMainChain() == 0 && pcoin->InMempool())
                  nTotal += pcoin->GetAvailableWatchOnlyCredit();
          }
      }
      return nTotal;
  }
  
  // Recursively determine the rounds of a given input (How deep is the PrivateSend chain for a given input)
  int CWallet::GetRealInputPrivateSendRounds(CTxIn txin, int nRounds) const
  {
      static std::map<uint256, CMutableTransaction> mDenomWtxes;
  
      if(nRounds >= 16) return 15; // 16 rounds max
  
      uint256 hash = txin.prevout.hash;
      unsigned int nout = txin.prevout.n;
  
      const CWalletTx* wtx = GetWalletTx(hash);
      if(wtx != NULL)
      {
          std::map<uint256, CMutableTransaction>::const_iterator mdwi = mDenomWtxes.find(hash);
          if (mdwi == mDenomWtxes.end()) {
              // not known yet, let's add it
              LogPrint("privatesend", "GetRealInputPrivateSendRounds INSERTING %s\n", hash.ToString());
              mDenomWtxes[hash] = CMutableTransaction(*wtx);
          } else if(mDenomWtxes[hash].vout[nout].nRounds != -10) {
              // found and it's not an initial value, just return it
              return mDenomWtxes[hash].vout[nout].nRounds;
          }
  
  
          // bounds check
          if (nout >= wtx->vout.size()) {
              // should never actually hit this
              LogPrint("privatesend", "GetRealInputPrivateSendRounds UPDATED   %s %3d %3d\n", hash.ToString(), nout, -4);
              return -4;
          }
  
          if (IsCollateralAmount(wtx->vout[nout].nValue)) {
              mDenomWtxes[hash].vout[nout].nRounds = -3;
              LogPrint("privatesend", "GetRealInputPrivateSendRounds UPDATED   %s %3d %3d\n", hash.ToString(), nout, mDenomWtxes[hash].vout[nout].nRounds);
              return mDenomWtxes[hash].vout[nout].nRounds;
          }
  
          //make sure the final output is non-denominate
          if (!IsDenominatedAmount(wtx->vout[nout].nValue)) { //NOT DENOM
              mDenomWtxes[hash].vout[nout].nRounds = -2;
              LogPrint("privatesend", "GetRealInputPrivateSendRounds UPDATED   %s %3d %3d\n", hash.ToString(), nout, mDenomWtxes[hash].vout[nout].nRounds);
              return mDenomWtxes[hash].vout[nout].nRounds;
          }
  
          bool fAllDenoms = true;
          BOOST_FOREACH(CTxOut out, wtx->vout) {
              fAllDenoms = fAllDenoms && IsDenominatedAmount(out.nValue);
          }
  
          // this one is denominated but there is another non-denominated output found in the same tx
          if (!fAllDenoms) {
              mDenomWtxes[hash].vout[nout].nRounds = 0;
              LogPrint("privatesend", "GetRealInputPrivateSendRounds UPDATED   %s %3d %3d\n", hash.ToString(), nout, mDenomWtxes[hash].vout[nout].nRounds);
              return mDenomWtxes[hash].vout[nout].nRounds;
          }
  
          int nShortest = -10; // an initial value, should be no way to get this by calculations
          bool fDenomFound = false;
          // only denoms here so let's look up
          BOOST_FOREACH(CTxIn txinNext, wtx->vin) {
              if (IsMine(txinNext)) {
                  int n = GetRealInputPrivateSendRounds(txinNext, nRounds + 1);
                  // denom found, find the shortest chain or initially assign nShortest with the first found value
                  if(n >= 0 && (n < nShortest || nShortest == -10)) {
                      nShortest = n;
                      fDenomFound = true;
                  }
              }
          }
          mDenomWtxes[hash].vout[nout].nRounds = fDenomFound
                                                 ? (nShortest >= 15 ? 16 : nShortest + 1) // good, we a +1 to the shortest one but only 16 rounds max allowed
                                                 : 0;            // too bad, we are the fist one in that chain
          LogPrint("privatesend", "GetRealInputPrivateSendRounds UPDATED   %s %3d %3d\n", hash.ToString(), nout, mDenomWtxes[hash].vout[nout].nRounds);
          return mDenomWtxes[hash].vout[nout].nRounds;
      }
  
      return nRounds - 1;
  }
  
  // respect current settings
  int CWallet::GetInputPrivateSendRounds(CTxIn txin) const
  {
      LOCK(cs_wallet);
      int realPrivateSendRounds = GetRealInputPrivateSendRounds(txin, 0);
      return realPrivateSendRounds > nPrivateSendRounds ? nPrivateSendRounds : realPrivateSendRounds;
  }
  
  
  bool CWallet::IsDenominated(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 IsDenominatedAmount(prev.vout[txin.prevout.n].nValue);
          }
      }
  
      return false;
  }
  
  bool CWallet::IsDenominatedAmount(CAmount nInputAmount) const {
      BOOST_FOREACH(CAmount d, vecPrivateSendDenominations)
      if(nInputAmount == d)
          return true;
      return false;
  }
  
  int CWallet::CountInputsWithAmount(CAmount nInputAmount) {
      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()) {
                  int nDepth = pcoin->GetDepthInMainChain(false);
  
                  for (unsigned int i = 0; i < pcoin->vout.size(); i++) {
                      COutput out = COutput(pcoin, i, nDepth, true, true);
                      CTxIn txin = CTxIn(out.tx->GetHash(), out.i);
  
                      if (out.tx->vout[out.i].nValue != nInputAmount) continue;
                      if (!IsDenominatedAmount(pcoin->vout[i].nValue)) continue;
                      if (IsSpent(out.tx->GetHash(), i) || IsMine(pcoin->vout[i]) != ISMINE_SPENDABLE ||
                          !IsDenominated(txin))
                          continue;
  
                      nTotal++;
                  }
              }
          }
      }
  
      return nTotal;
  }
  
  bool CWallet::HasCollateralInputs(bool fOnlyConfirmed) const {
      vector <COutput> vCoins;
      AvailableCoins(vCoins, fOnlyConfirmed, NULL, false, ONLY_PRIVATESEND_COLLATERAL);
  
      return !vCoins.empty();
  }
  
  
  bool CWallet::IsCollateralAmount(CAmount nInputAmount) const {
      // collateral inputs should always be a 2x..4x of PRIVATESEND_COLLATERAL
      return nInputAmount >= PRIVATESEND_COLLATERAL * 2 &&
             nInputAmount <= PRIVATESEND_COLLATERAL * 4 &&
             nInputAmount % PRIVATESEND_COLLATERAL == 0;
  }
  
  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, AvailableCoinsType nCoinType, bool fUseInstantSend) 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(false);
              // do not use IX for inputs that have less then INSTANTSEND_CONFIRMATIONS_REQUIRED blockchain confirmations
  //            if (fUseInstantSend && nDepth < INSTANTSEND_CONFIRMATIONS_REQUIRED)
  //                continue;
  
              // We should not consider coins which aren't at least in our mempool
              // It's possible for these to be conflicted via ancestors which we may never be able to detect
              if (nDepth == 0 && !pcoin->InMempool())
                  continue;
  
              for (unsigned int i = 0; i < pcoin->vout.size(); i++) {
                  bool found = false;
                  if (nCoinType == ONLY_DENOMINATED) {
                      found = IsDenominatedAmount(pcoin->vout[i].nValue);
                  } else if (nCoinType == ONLY_NOT1000IFMN) {
                      found = !(fNoirNode && pcoin->vout[i].nValue == NOIRNODE_COIN_REQUIRED * COIN);
                  } else if (nCoinType == ONLY_NONDENOMINATED_NOT1000IFMN) {
                      if (IsCollateralAmount(pcoin->vout[i].nValue)) continue; // do not use collateral amounts
                      found = !IsDenominatedAmount(pcoin->vout[i].nValue);
                      if (found && fNoirNode) found = pcoin->vout[i].nValue != NOIRNODE_COIN_REQUIRED * COIN; // do not use Hot MN funds
                  } else if (nCoinType == ONLY_1000) {
  
                      found = pcoin->vout[i].nValue == NOIRNODE_COIN_REQUIRED * COIN;
                  } else if (nCoinType == ONLY_PRIVATESEND_COLLATERAL) {
                      found = IsCollateralAmount(pcoin->vout[i].nValue);
                  } else {
                      found = true;
                  }
                  if (!found) continue;
  
                  isminetype mine = IsMine(pcoin->vout[i]);
                  if (!(IsSpent(wtxid, i)) &&
                          mine != ISMINE_NO &&
                          (!IsLockedCoin((*it).first, i) || nCoinType == ONLY_1000) &&
                          (pcoin->vout[i].nValue > nMinimumInputValue) &&
                          (
                                  !coinControl ||
                                  !coinControl->HasSelected() ||
                                  coinControl->fAllowOtherInputs ||
                                  coinControl->IsSelected(COutPoint((*it).first, i))
                          )
                      ) {
                      vCoins.push_back(COutput(pcoin, i, nDepth,
                                               ((mine & ISMINE_SPENDABLE) != ISMINE_NO) ||
                                               (coinControl && coinControl->fAllowWatchOnly &&
                                                (mine & ISMINE_WATCH_SOLVABLE) != ISMINE_NO),
                                               (mine & (ISMINE_SPENDABLE | ISMINE_WATCH_SOLVABLE)) != ISMINE_NO));
                  }
              }
          }
      }
  }
  
  
  bool CWallet::SelectCoinsDark(CAmount nValueMin, CAmount nValueMax, std::vector <CTxIn> &vecTxInRet, CAmount &nValueRet,
                                int nPrivateSendRoundsMin, int nPrivateSendRoundsMax) const {
      CCoinControl *coinControl = NULL;
  
      vecTxInRet.clear();
      nValueRet = 0;
  
      vector <COutput> vCoins;
      AvailableCoins(vCoins, true, coinControl, false, nPrivateSendRoundsMin < 0 ? ONLY_NONDENOMINATED_NOT1000IFMN : ONLY_DENOMINATED);
  
      //order the array so largest nondenom are first, then denominations, then very small inputs.
      sort(vCoins.rbegin(), vCoins.rend(), CompareByPriority());
  
      BOOST_FOREACH(const COutput &out, vCoins)
      {
          //do not allow inputs less than 1/10th of minimum value
          if (out.tx->vout[out.i].nValue < nValueMin / 10) continue;
          //do not allow collaterals to be selected
          if (IsCollateralAmount(out.tx->vout[out.i].nValue)) continue;
          if (fNoirNode && out.tx->vout[out.i].nValue == NOIRNODE_COIN_REQUIRED * COIN) continue; //noirnode input
  
          if (nValueRet + out.tx->vout[out.i].nValue <= nValueMax) {
              CTxIn txin = CTxIn(out.tx->GetHash(), out.i);
  
              int nRounds = GetInputPrivateSendRounds(txin);
              if (nRounds >= nPrivateSendRoundsMax) continue;
              if (nRounds < nPrivateSendRoundsMin) continue;
  
              txin.prevPubKey = out.tx->vout[out.i].scriptPubKey; // the inputs PubKey
              nValueRet += out.tx->vout[out.i].nValue;
              vecTxInRet.push_back(txin);
          }
      }
  
      return nValueRet >= nValueMin;
  }
  
  // noirnode
  bool CWallet::GetCollateralTxIn(CTxIn& txinRet, CAmount& nValueRet) const
  {
      vector<COutput> vCoins;
  
      AvailableCoins(vCoins);
  
      BOOST_FOREACH(const COutput& out, vCoins)
      {
          if(IsCollateralAmount(out.tx->vout[out.i].nValue))
          {
              txinRet = CTxIn(out.tx->GetHash(), out.i);
              txinRet.prevPubKey = out.tx->vout[out.i].scriptPubKey; // the inputs PubKey
              nValueRet = out.tx->vout[out.i].nValue;
              return true;
          }
      }
  
      return false;
  }
  
  bool CWallet::GetNoirnodeVinAndKeys(CTxIn &txinRet, CPubKey &pubKeyRet, CKey &keyRet, std::string strTxHash,
                                   std::string strOutputIndex) {
      // wait for reindex and/or import to finish
      if (fImporting || fReindex) return false;
  
      // Find possible candidates
      std::vector <COutput> vPossibleCoins;
      AvailableCoins(vPossibleCoins, true, NULL, false, ONLY_1000);
      if (vPossibleCoins.empty()) {
          LogPrintf("CWallet::GetNoirnodeVinAndKeys -- Could not locate any valid noirnode vin\n");
          return false;
      }
  
      if (strTxHash.empty()) // No output specified, select the first one
          return GetVinAndKeysFromOutput(vPossibleCoins[0], txinRet, pubKeyRet, keyRet);
  
      // Find specific vin
      uint256 txHash = uint256S(strTxHash);
      int nOutputIndex = atoi(strOutputIndex.c_str());
  
      BOOST_FOREACH(COutput & out, vPossibleCoins)
      if (out.tx->GetHash() == txHash && out.i == nOutputIndex) // found it!
          return GetVinAndKeysFromOutput(out, txinRet, pubKeyRet, keyRet);
  
      LogPrintf("CWallet::GetNoirnodeVinAndKeys -- Could not locate specified noirnode vin\n");
      return false;
  }
  
  bool CWallet::GetVinAndKeysFromOutput(COutput out, CTxIn &txinRet, CPubKey &pubKeyRet, CKey &keyRet) {
      // wait for reindex and/or import to finish
      if (fImporting || fReindex) return false;
  
      CScript pubScript;
  
      txinRet = CTxIn(out.tx->GetHash(), out.i);
      pubScript = out.tx->vout[out.i].scriptPubKey; // the inputs PubKey
  
      CTxDestination address1;
      ExtractDestination(pubScript, address1);
      CBitcoinAddress address2(address1);
  
      CKeyID keyID;
      if (!address2.GetKeyID(keyID)) {
          LogPrintf("CWallet::GetVinAndKeysFromOutput -- Address does not refer to a key\n");
          return false;
      }
  
      if (!GetKey(keyID, keyRet)) {
          LogPrintf("CWallet::GetVinAndKeysFromOutput -- Private key for address is not known\n");
          return false;
      }
  
      pubKeyRet = keyRet.GetPubKey();
      return true;
  }
  
  //[zcoin]
  void CWallet::ListAvailableCoinsMintCoins(vector <COutput> &vCoins, bool fOnlyConfirmed) const {
      vCoins.clear();
      {
          LOCK(cs_wallet);
          list <CZerocoinEntry> listPubCoin = list<CZerocoinEntry>();
          CWalletDB walletdb(pwalletMain->strWalletFile);
          walletdb.ListPubCoin(listPubCoin);
          LogPrintf("listPubCoin.size()=%s\n", listPubCoin.size());
          for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it) {
              const CWalletTx *pcoin = &(*it).second;
  //            LogPrintf("pcoin=%s\n", pcoin->GetHash().ToString());
              if (!CheckFinalTx(*pcoin)) {
                  LogPrintf("!CheckFinalTx(*pcoin)=%s\n", !CheckFinalTx(*pcoin));
                  continue;
              }
  
              if (fOnlyConfirmed && !pcoin->IsTrusted()) {
                  LogPrintf("fOnlyConfirmed = %s, !pcoin->IsTrusted()\n", fOnlyConfirmed, !pcoin->IsTrusted());
                  continue;
              }
  
              if (pcoin->IsCoinBase() && pcoin->GetBlocksToMaturity() > 0) {
                  LogPrintf("Not trusted\n");
                  continue;
              }
  
              int nDepth = pcoin->GetDepthInMainChain();
              if (nDepth < 0) {
                  LogPrintf("nDepth=%s\n", nDepth);
                  continue;
              }
              LogPrintf("pcoin->vout.size()=%s\n", pcoin->vout.size());
  
              for (unsigned int i = 0; i < pcoin->vout.size(); i++) {
                  if (pcoin->vout[i].scriptPubKey.IsZerocoinMint()) {
                      CTxOut txout = pcoin->vout[i];
                      vector<unsigned char> vchZeroMint;
                      vchZeroMint.insert(vchZeroMint.end(), txout.scriptPubKey.begin() + 6,
                                         txout.scriptPubKey.begin() + txout.scriptPubKey.size());
  
                      CBigNum pubCoin;
                      pubCoin.setvch(vchZeroMint);
                      LogPrintf("Pubcoin=%s\n", pubCoin.ToString());
                      // CHECKING PROCESS
                      BOOST_FOREACH(const CZerocoinEntry &pubCoinItem, listPubCoin) {
  //                        LogPrintf("*******\n");
  //                        LogPrintf("pubCoinItem.value=%s,\n", pubCoinItem.value.ToString());
  //                        LogPrintf("pubCoinItem.IsUsed=%s\n, ", pubCoinItem.IsUsed);
  //                        LogPrintf("pubCoinItem.randomness=%s\n, ", pubCoinItem.randomness);
  //                        LogPrintf("pubCoinItem.serialNumber=%s\n, ", pubCoinItem.serialNumber);
                          if (pubCoinItem.value == pubCoin && pubCoinItem.IsUsed == false &&
                              pubCoinItem.randomness != 0 && pubCoinItem.serialNumber != 0) {
                              vCoins.push_back(COutput(pcoin, i, nDepth, true, true));
                              LogPrintf("-->OK\n");
                          }
                      }
  
                  }
              }
          }
      }
  }
  
  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, const int nConfMine, const int nConfTheirs,
                                   const uint64_t nMaxAncestors, 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;
  
          if (!mempool.TransactionWithinChainLimit(pcoin->GetHash(), nMaxAncestors))
              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
      std::sort(vValue.begin(), vValue.end(), CompareValueOnly());
      std::reverse(vValue.begin(), vValue.end());
      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 vector <COutput> &vAvailableCoins, const CAmount &nTargetValue,
                            set <pair<const CWalletTx *, unsigned int>> &setCoinsRet, CAmount &nValueRet,
                            const CCoinControl *coinControl, AvailableCoinsType nCoinType, bool fUseInstantSend) const {
      vector <COutput> vCoins(vAvailableCoins);
  
      // 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;
              if (nCoinType == ONLY_DENOMINATED) {
                  CTxIn txin = CTxIn(out.tx->GetHash(), out.i);
                  int nRounds = GetInputPrivateSendRounds(txin);
                  // make sure it's actually anonymized
                  if (nRounds < nPrivateSendRounds) continue;
              }
              nValueRet += out.tx->vout[out.i].nValue;
              setCoinsRet.insert(make_pair(out.tx, out.i));
          }
          return (nValueRet >= nTargetValue);
      }
  
      //if we're doing only denominated, we need to round up to the nearest smallest denomination
      if (nCoinType == ONLY_DENOMINATED) {
          CAmount nSmallestDenom = vecPrivateSendDenominations.back();
          // Make outputs by looping through denominations, from large to small
          BOOST_FOREACH(CAmount nDenom, vecPrivateSendDenominations)
          {
              BOOST_FOREACH(const COutput &out, vCoins)
              {
                  //make sure it's the denom we're looking for, round the amount up to smallest denom
                  if (out.tx->vout[out.i].nValue == nDenom && nValueRet + nDenom < nTargetValue + nSmallestDenom) {
                      CTxIn txin = CTxIn(out.tx->GetHash(), out.i);
                      int nRounds = GetInputPrivateSendRounds(txin);
                      // make sure it's actually anonymized
                      if (nRounds < nPrivateSendRounds) continue;
                      nValueRet += nDenom;
                      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;
      }
  
      size_t nMaxChainLength = std::min(GetArg("-limitancestorcount", DEFAULT_ANCESTOR_LIMIT),
                                        GetArg("-limitdescendantcount", DEFAULT_DESCENDANT_LIMIT));
      bool fRejectLongChains = GetBoolArg("-walletrejectlongchains", DEFAULT_WALLET_REJECT_LONG_CHAINS);
  
      bool res = nTargetValue <= nValueFromPresetInputs ||
                 SelectCoinsMinConf(nTargetValue - nValueFromPresetInputs, 1, 6, 0, vCoins, setCoinsRet, nValueRet) ||
                 SelectCoinsMinConf(nTargetValue - nValueFromPresetInputs, 1, 1, 0, vCoins, setCoinsRet, nValueRet) ||
                 (bSpendZeroConfChange &&
                  SelectCoinsMinConf(nTargetValue - nValueFromPresetInputs, 0, 1, 2, vCoins, setCoinsRet,
                                     nValueRet)) ||
                 (bSpendZeroConfChange && SelectCoinsMinConf(nTargetValue - nValueFromPresetInputs, 0, 1,
                                                             std::min((size_t) 4, nMaxChainLength / 3), vCoins,
                                                             setCoinsRet, nValueRet)) ||
                 (bSpendZeroConfChange &&
                  SelectCoinsMinConf(nTargetValue - nValueFromPresetInputs, 0, 1, nMaxChainLength / 2, vCoins,
                                     setCoinsRet, nValueRet)) ||
                 (bSpendZeroConfChange &&
                  SelectCoinsMinConf(nTargetValue - nValueFromPresetInputs, 0, 1, nMaxChainLength, vCoins,
                                     setCoinsRet,
                                     nValueRet)) ||
                 (bSpendZeroConfChange && !fRejectLongChains &&
                  SelectCoinsMinConf(nTargetValue - nValueFromPresetInputs, 0, 1,
                                     std::numeric_limits<uint64_t>::max(),
                                     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, bool overrideEstimatedFeeRate,
                                const CFeeRate &specificFeeRate, int &nChangePosInOut, std::string &strFailReason,
                                bool includeWatching, bool lockUnspents, const CTxDestination &destChange) {
      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.destChange = destChange;
      coinControl.fAllowOtherInputs = true;
      coinControl.fAllowWatchOnly = includeWatching;
      coinControl.fOverrideFeeRate = overrideEstimatedFeeRate;
      coinControl.nFeeRate = specificFeeRate;
  
      BOOST_FOREACH(const CTxIn &txin, tx.vin)
          coinControl.Select(txin.prevout);
  
      CReserveKey reservekey(this);
      CWalletTx wtx;
      if (!CreateTransaction(vecSend, wtx, reservekey, nFeeRet, nChangePosInOut, strFailReason, &coinControl, false))
          return false;
  
      if (nChangePosInOut != -1)
          tx.vout.insert(tx.vout.begin() + nChangePosInOut, wtx.vout[nChangePosInOut]);
  
      // Add new txins (keeping original txin scriptSig/order)
      BOOST_FOREACH(const CTxIn &txin, wtx.vin)
      {
          if (!coinControl.IsSelected(txin.prevout)) {
              tx.vin.push_back(txin);
  
              if (lockUnspents) {
                  LOCK2(cs_main, cs_wallet);
                  LockCoin(txin.prevout);
              }
          }
      }
  
      return true;
  }
  
  bool CWallet::ConvertList(std::vector <CTxIn> vecTxIn, std::vector <CAmount> &vecAmounts) {
      BOOST_FOREACH(CTxIn txin, vecTxIn) {
          if (mapWallet.count(txin.prevout.hash)) {
              CWalletTx &wtx = mapWallet[txin.prevout.hash];
              if (txin.prevout.n < wtx.vout.size()) {
                  vecAmounts.push_back(wtx.vout[txin.prevout.n].nValue);
              }
          } else {
              LogPrintf("CWallet::ConvertList -- Couldn't find transaction\n");
          }
      }
      return true;
  }
  
  bool CWallet::SelectCoinsByDenominations(int nDenom, CAmount nValueMin, CAmount nValueMax,
                                           std::vector <CTxIn> &vecTxInRet, std::vector <COutput> &vCoinsRet,
                                           CAmount &nValueRet, int nPrivateSendRoundsMin, int nPrivateSendRoundsMax) {
      vecTxInRet.clear();
      vCoinsRet.clear();
      nValueRet = 0;
  
      vector <COutput> vCoins;
      AvailableCoins(vCoins, true, NULL, false, ONLY_DENOMINATED);
  
      std::random_shuffle(vCoins.rbegin(), vCoins.rend(), GetRandInt);
  
      // ( bit on if present )
      // bit 0 - 100ZCOIN+1
      // bit 1 - 10ZCOIN+1
      // bit 2 - 1ZCOIN+1
      // bit 3 - .1ZCOIN+1
  
      std::vector<int> vecBits;
      if (!darkSendPool.GetDenominationsBits(nDenom, vecBits)) {
          return false;
      }
  
      int nDenomResult = 0;
  
      InsecureRand insecureRand;
      BOOST_FOREACH(const COutput &out, vCoins)
      {
          // noirnode-like input should not be selected by AvailableCoins now anyway
          //if(out.tx->vout[out.i].nValue == 1000*COIN) continue;
          if (nValueRet + out.tx->vout[out.i].nValue <= nValueMax) {
  
              CTxIn txin = CTxIn(out.tx->GetHash(), out.i);
  
              int nRounds = GetInputPrivateSendRounds(txin);
              if (nRounds >= nPrivateSendRoundsMax) continue;
              if (nRounds < nPrivateSendRoundsMin) continue;
  
              BOOST_FOREACH(int nBit, vecBits) {
                  if (out.tx->vout[out.i].nValue == vecPrivateSendDenominations[nBit]) {
                      if (nValueRet >= nValueMin) {
                          //randomly reduce the max amount we'll submit (for anonymity)
                          nValueMax -= insecureRand(nValueMax/5);
                          //on average use 50% of the inputs or less
                          int r = insecureRand(vCoins.size());
                          if ((int) vecTxInRet.size() > r) return true;
                      }
                      txin.prevPubKey = out.tx->vout[out.i].scriptPubKey; // the inputs PubKey
                      nValueRet += out.tx->vout[out.i].nValue;
                      vecTxInRet.push_back(txin);
                      vCoinsRet.push_back(out);
                      nDenomResult |= 1 << nBit;
                  }
              }
          }
      }
  
      return nValueRet >= nValueMin && nDenom == nDenomResult;
  }
  
  bool CWallet::CreateCollateralTransaction(CMutableTransaction &txCollateral, std::string &strReason) {
      txCollateral.vin.clear();
      txCollateral.vout.clear();
  
      CReserveKey reservekey(this);
      CAmount nValue = 0;
      CTxIn txinCollateral;
  
      if (!GetCollateralTxIn(txinCollateral, nValue)) {
          strReason = "PrivateSend requires a collateral transaction and could not locate an acceptable input!";
          return false;
      }
  
      // make our change address
      CScript scriptChange;
      CPubKey vchPubKey;
      assert(reservekey.GetReservedKey(vchPubKey)); // should never fail, as we just unlocked
      scriptChange = GetScriptForDestination(vchPubKey.GetID());
      reservekey.KeepKey();
  
      txCollateral.vin.push_back(txinCollateral);
  
      //pay collateral charge in fees
      CTxOut txout = CTxOut(nValue - PRIVATESEND_COLLATERAL, scriptChange);
      txCollateral.vout.push_back(txout);
      CAmount amount;
      if (!SignSignature(*this, txinCollateral.prevPubKey, txCollateral, 0, amount, int(SIGHASH_ALL | SIGHASH_ANYONECANPAY))) {
          strReason = "Unable to sign collateral transaction!";
          return false;
      }
  
      return true;
  }
  
  bool CWallet::SelectCoinsGrouppedByAddresses(std::vector <CompactTallyItem> &vecTallyRet, bool fSkipDenominated,
                                               bool fAnonymizable) const {
      LOCK2(cs_main, cs_wallet);
  
      isminefilter filter = ISMINE_SPENDABLE;
  
      // try to use cache
      if (fAnonymizable) {
          if(fSkipDenominated && fAnonymizableTallyCachedNonDenom) {
              vecTallyRet = vecAnonymizableTallyCachedNonDenom;
              LogPrint("selectcoins", "SelectCoinsGrouppedByAddresses - using cache for non-denom inputs\n");
              return vecTallyRet.size() > 0;
          }
          if(!fSkipDenominated && fAnonymizableTallyCached) {
              vecTallyRet = vecAnonymizableTallyCached;
              LogPrint("selectcoins", "SelectCoinsGrouppedByAddresses - using cache for all inputs\n");
              return vecTallyRet.size() > 0;
          }
      }
  
      // Tally
      map <CBitcoinAddress, CompactTallyItem> mapTally;
      for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it) {
          const CWalletTx &wtx = (*it).second;
  
          if (wtx.IsCoinBase() && wtx.GetBlocksToMaturity() > 0) continue;
          if (!fAnonymizable && !wtx.IsTrusted()) continue;
  
          for (unsigned int i = 0; i < wtx.vout.size(); i++) {
              CTxDestination address;
              if (!ExtractDestination(wtx.vout[i].scriptPubKey, address)) continue;
  
              isminefilter mine = ::IsMine(*this, address);
              if (!(mine & filter)) continue;
  
              if (IsSpent(wtx.GetHash(), i) || IsLockedCoin(wtx.GetHash(), i)) continue;
  
              if (fSkipDenominated && IsDenominatedAmount(wtx.vout[i].nValue)) continue;
  
              if (fAnonymizable) {
                  // ignore collaterals
                  if (IsCollateralAmount(wtx.vout[i].nValue)) continue;
                  if (fNoirNode && wtx.vout[i].nValue == NOIRNODE_COIN_REQUIRED * COIN) continue;
                  // ignore outputs that are 10 times smaller then the smallest denomination
                  // otherwise they will just lead to higher fee / lower priority
                  if (wtx.vout[i].nValue <= vecPrivateSendDenominations.back() / 10) continue;
                  // ignore anonymized
                  if(GetInputPrivateSendRounds(CTxIn(wtx.GetHash(), i)) >= nPrivateSendRounds) continue;
              }
  
              CompactTallyItem &item = mapTally[address];
              item.address = address;
              item.nAmount += wtx.vout[i].nValue;
              item.vecTxIn.push_back(CTxIn(wtx.GetHash(), i));
          }
      }
  
      // construct resulting vector
      vecTallyRet.clear();
      BOOST_FOREACH(const PAIRTYPE(CBitcoinAddress, CompactTallyItem)&item, mapTally) {
          if (fAnonymizable && item.second.nAmount < vecPrivateSendDenominations.back()) continue;
          vecTallyRet.push_back(item.second);
      }
  
      // order by amounts per address, from smallest to largest
      sort(vecTallyRet.rbegin(), vecTallyRet.rend(), CompareByAmount());
  
      // cache anonymizable for later use
      if (fAnonymizable) {
          if (fSkipDenominated) {
              vecAnonymizableTallyCachedNonDenom = vecTallyRet;
              fAnonymizableTallyCachedNonDenom = true;
          } else {
              vecAnonymizableTallyCached = vecTallyRet;
              fAnonymizableTallyCached = true;
          }
      }
  
      // debug
      std::string strMessage = "SelectCoinsGrouppedByAddresses - vecTallyRet:\n";
      BOOST_FOREACH(CompactTallyItem & item, vecTallyRet)
          strMessage += strprintf("  %s %f\n", item.address.ToString().c_str(), float(item.nAmount) / COIN);
      LogPrint("selectcoins", "%s", strMessage);
  
      return vecTallyRet.size() > 0;
  }
  
  bool CWallet::CreateTransaction(const vector <CRecipient> &vecSend, CWalletTx &wtxNew, CReserveKey &reservekey,
                                  CAmount &nFeeRet,
                                  int &nChangePosInOut, std::string &strFailReason, const CCoinControl *coinControl,
                                  bool sign, AvailableCoinsType nCoinType, bool fUseInstantSend) {
      LogPrintf("CreateTransaction()\n");
      CAmount nValue = 0;
      int nChangePosRequest = nChangePosInOut;
      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);
          {
              std::vector <COutput> vAvailableCoins;
              AvailableCoins(vAvailableCoins, true, coinControl, false, nCoinType, fUseInstantSend);
  
              nFeeRet = payTxFee.GetFeePerK();
              // Start with no fee and loop until there is enough fee
              while (true) {
                  nChangePosInOut = nChangePosRequest;
                  txNew.vin.clear();
                  txNew.vout.clear();
                  txNew.wit.SetNull();
                  wtxNew.fFromMe = true;
  //                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 (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(vAvailableCoins, nValueToSelect, setCoins, nValueIn, coinControl)) {
                      if (nCoinType == ONLY_NOT1000IFMN) {
                          strFailReason = _("Unable to locate enough funds for this transaction that are not equal 25000 NOI.");
                      } else if (nCoinType == ONLY_NONDENOMINATED_NOT1000IFMN) {
                          strFailReason = _("Unable to locate enough PrivateSend non-denominated funds for this transaction that are not equal 25000 NOI.");
                      } else if (nCoinType == ONLY_DENOMINATED) {
                          strFailReason = _("Unable to locate enough PrivateSend denominated funds for this transaction.");
                          strFailReason += _("PrivateSend uses exact denominated amounts to send funds, you might simply need to anonymize some more coins.");
                      } else if (nValueIn < nValueToSelect) {
                          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) {
                      //over pay for denominated transactions
                      if (nCoinType == ONLY_DENOMINATED) {
                          nFeeRet += nChange;
                          wtxNew.mapValue["DS"] = "1";
                          // recheck skipped denominations during next mixing
                          darkSendPool.ClearSkippedDenominations();
                      } else {
                          // 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);
                              if (!ret) {
                                  strFailReason = _("Keypool ran out, please call keypoolrefill first");
                                  return false;
                              }
  
                              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)) {
                              nChangePosInOut = -1;
                              nFeeRet += nChange;
                              reservekey.ReturnKey();
                          } else {
                              if (nChangePosInOut == -1) {
                                  // Insert change txn at random position:
                                  nChangePosInOut = GetRandInt(txNew.vout.size() + 1);
                              } else if ((unsigned int) nChangePosInOut > txNew.vout.size()) {
                                  strFailReason = _("Change index out of range");
                                  return false;
                              }
  
                              vector<CTxOut>::iterator position = txNew.vout.begin() + nChangePosInOut;
                              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;
                      SignatureData sigdata;
                      if (sign)
                          signSuccess = ProduceSignature(TransactionSignatureCreator(this, &txNewConst, nIn, coin.first->vout[coin.second].nValue, SIGHASH_ALL),
                                  scriptPubKey, sigdata);
                      else
                          signSuccess = ProduceSignature(DummySignatureCreator(this), scriptPubKey, sigdata);
  
                      if (!signSuccess) {
                          strFailReason = _("Signing transaction failed");
                          return false;
                      } else {
                          UpdateTransaction(txNew, nIn, sigdata);
                      }
  
                      nIn++;
                  }
  
                  unsigned int nBytes = GetVirtualTransactionSize(txNew);
  
                  // Remove scriptSigs if we used dummy signatures for fee calculation
                  if (!sign) {
                      BOOST_FOREACH(CTxIn & vin, txNew.vin)
                          vin.scriptSig = CScript();
                      txNew.wit.SetNull();
                  }
  
                  // Embed the constructed transaction data in wtxNew.
                  *static_cast<CTransaction *>(&wtxNew) = CTransaction(txNew);
  
                  // Limit size
                  if (GetTransactionWeight(txNew) >= MAX_STANDARD_TX_WEIGHT) {
                      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 (coinControl && coinControl->fOverrideFeeRate)
                      nFeeNeeded = coinControl->nFeeRate.GetFee(nBytes);
  
                  // 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;
              }
          }
      }
  
      if (GetBoolArg("-walletrejectlongchains", DEFAULT_WALLET_REJECT_LONG_CHAINS)) {
          // Lastly, ensure this tx will pass the mempool's chain limits
          LockPoints lp;
          CTxMemPoolEntry entry(txNew, 0, 0, 0, 0, false, 0, false, 0, lp);
          CTxMemPool::setEntries setAncestors;
          size_t nLimitAncestors = GetArg("-limitancestorcount", DEFAULT_ANCESTOR_LIMIT);
          size_t nLimitAncestorSize = GetArg("-limitancestorsize", DEFAULT_ANCESTOR_SIZE_LIMIT) * 1000;
          size_t nLimitDescendants = GetArg("-limitdescendantcount", DEFAULT_DESCENDANT_LIMIT);
          size_t nLimitDescendantSize = GetArg("-limitdescendantsize", DEFAULT_DESCENDANT_SIZE_LIMIT) * 1000;
          std::string errString;
          if (!mempool.CalculateMemPoolAncestors(entry, setAncestors, nLimitAncestors, nLimitAncestorSize,
                                                 nLimitDescendants, nLimitDescendantSize, errString)) {
              strFailReason = _("Transaction has too long of a mempool chain");
              return false;
          }
      }
      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) {
              CValidationState state;
              // Broadcast
              if (!wtxNew.AcceptToMemoryPool(false, maxTxFee, state, true)) {
                  LogPrintf("CommitTransaction(): Transaction cannot be broadcast immediately, %s\n",
                            state.GetRejectReason());
                  // TODO: if we expect the failure to be long term or permanent, instead delete wtx from the wallet and return failure.
              } else {
                  LogPrintf("AcceptToMemoryPool success!\n");
                  wtxNew.RelayWalletTransaction();
              }
          }
      }
      return true;
  }
  
  bool CWallet::EraseFromWallet(uint256 hash) {
      if (!fFileBacked)
          return false;
      {
          LOCK(cs_wallet);
          if (mapWallet.erase(hash))
              CWalletDB(strWalletFile).EraseTx(hash);
      }
      return true;
  }
  
  bool CWallet::CreateZerocoinMintModel(string &stringError, string denomAmount) {
  
      if (!fFileBacked)
          return false;
  
      int64_t nAmount = 0;
      libzerocoin::CoinDenomination denomination;
      // Amount
      if (denomAmount == "1") {
          denomination = libzerocoin::ZQ_LOVELACE;
          nAmount = roundint64(1 * COIN);
      } else if (denomAmount == "10") {
          denomination = libzerocoin::ZQ_GOLDWASSER;
          nAmount = roundint64(10 * COIN);
      } else if (denomAmount == "25") {
          denomination = libzerocoin::ZQ_RACKOFF;
          nAmount = roundint64(25 * COIN);
      } else if (denomAmount == "50") {
          denomination = libzerocoin::ZQ_PEDERSEN;
          nAmount = roundint64(50 * COIN);
      } else if (denomAmount == "100") {
          denomination = libzerocoin::ZQ_WILLIAMSON;
          nAmount = roundint64(100 * COIN);
      } else {
          return false;
      }
  
      libzerocoin::Params *zcParams = ZCParamsV2;
  
      int mintVersion = ZEROCOIN_TX_VERSION_1;
  
      // do not use v2 mint until certain moment when it would be understood by peers
      {
          LOCK(cs_main);
          bool fTestNet = Params().NetworkIDString() == CBaseChainParams::TESTNET;
          int allowedV1Height = fTestNet ? ZC_V1_5_TESTNET_STARTING_BLOCK : ZC_V1_5_STARTING_BLOCK;
          if (chainActive.Height() >= allowedV1Height)
              mintVersion = ZEROCOIN_TX_VERSION_2;
      }
  
      // The following constructor does all the work of minting a brand
      // new zerocoin. It stores all the private values inside the
      // PrivateCoin object. This includes the coin secrets, which must be
      // stored in a secure location (wallet) at the client.
      libzerocoin::PrivateCoin newCoin(zcParams, denomination, mintVersion);
  
  
      // Get a copy of the 'public' portion of the coin. You should
      // embed this into a Zerocoin 'MINT' transaction along with a series
      // of currency inputs totaling the assigned value of one zerocoin.
      libzerocoin::PublicCoin pubCoin = newCoin.getPublicCoin();
  
      // Validate
      if (pubCoin.validate()) {
          //TODOS
          CScript scriptSerializedCoin =
                  CScript() << OP_ZEROCOINMINT << pubCoin.getValue().getvch().size() << pubCoin.getValue().getvch();
  
          // Wallet comments
          CWalletTx wtx;
  
          stringError = MintZerocoin(scriptSerializedCoin, nAmount, wtx);
  
          if (stringError != "")
              return false;
  
  
          const unsigned char *ecdsaSecretKey = newCoin.getEcdsaSeckey();
          CZerocoinEntry zerocoinTx;
          zerocoinTx.IsUsed = false;
          zerocoinTx.denomination = denomination;
          zerocoinTx.value = pubCoin.getValue();
          zerocoinTx.randomness = newCoin.getRandomness();
          zerocoinTx.serialNumber = newCoin.getSerialNumber();
          zerocoinTx.ecdsaSecretKey = std::vector<unsigned char>(ecdsaSecretKey, ecdsaSecretKey+32);
          LogPrintf("CreateZerocoinMintModel() -> NotifyZerocoinChanged\n");
          LogPrintf("pubcoin=%s, isUsed=%s\n", zerocoinTx.value.GetHex(), zerocoinTx.IsUsed);
          LogPrintf("randomness=%s, serialNumber=%s\n", zerocoinTx.randomness, zerocoinTx.serialNumber);
          NotifyZerocoinChanged(this, zerocoinTx.value.GetHex(), "New (" + std::to_string(zerocoinTx.denomination) + " mint)", CT_NEW);
          if (!CWalletDB(strWalletFile).WriteZerocoinEntry(zerocoinTx))
              return false;
          return true;
      } else {
          return false;
      }
  }
  
  bool CWallet::CreateZerocoinSpendModel(string &stringError, string thirdPartyAddress, string denomAmount, bool forceUsed) {
      if (!fFileBacked)
          return false;
  
      int64_t nAmount = 0;
      libzerocoin::CoinDenomination denomination;
      // Amount
      if (denomAmount == "1") {
          denomination = libzerocoin::ZQ_LOVELACE;
          nAmount = roundint64(1 * COIN);
      } else if (denomAmount == "10") {
          denomination = libzerocoin::ZQ_GOLDWASSER;
          nAmount = roundint64(10 * COIN);
      } else if (denomAmount == "25") {
          denomination = libzerocoin::ZQ_RACKOFF;
          nAmount = roundint64(25 * COIN);
      } else if (denomAmount == "50") {
          denomination = libzerocoin::ZQ_PEDERSEN;
          nAmount = roundint64(50 * COIN);
      } else if (denomAmount == "100") {
          denomination = libzerocoin::ZQ_WILLIAMSON;
          nAmount = roundint64(100 * COIN);
      } else {
          return false;
      }
  
      // Wallet comments
      CWalletTx wtx;
  
      CBigNum coinSerial;
      uint256 txHash;
      CBigNum zcSelectedValue;
      bool zcSelectedIsUsed;
  
      stringError = SpendZerocoin(thirdPartyAddress, nAmount, denomination, wtx, coinSerial, txHash, zcSelectedValue, zcSelectedIsUsed, forceUsed);
  
      if (stringError != "")
          return false;
  
      return true;
  
  }
  
  /**
   * @brief CWallet::CreateZerocoinMintTransaction
   * @param vecSend
   * @param wtxNew
   * @param reservekey
   * @param nFeeRet
   * @param strFailReason
   * @param coinControl
   * @return
   */
  bool CWallet::CreateZerocoinMintTransaction(const vector <CRecipient> &vecSend, CWalletTx &wtxNew,
                                              CReserveKey &reservekey,
                                              CAmount &nFeeRet, int &nChangePosInOut, std::string &strFailReason,
                                              const CCoinControl *coinControl, bool sign) {
      CAmount nValue = 0;
      int nChangePosRequest = nChangePosInOut;
      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;
      txNew.nLockTime = chainActive.Height();
      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);
          {
              std::vector <COutput> vAvailableCoins;
              AvailableCoins(vAvailableCoins, true, coinControl);
  
  
              nFeeRet = payTxFee.GetFeePerK();
              LogPrintf("nFeeRet=%s\n", nFeeRet);
              // Start with no fee and loop until there is enough fee
              while (true) {
                  nChangePosInOut = nChangePosRequest;
                  txNew.vin.clear();
                  txNew.vout.clear();
                  txNew.wit.SetNull();
                  wtxNew.fFromMe = true;
  //                bool fFirst = true;
  
                  CAmount nValueToSelect = nValue + nFeeRet;
  //                if (nSubtractFeeFromAmount == 0)
  //                    nValueToSelect += nFeeRet;
                  double dPriority = 0;
                  // vouts to the payees
                  BOOST_FOREACH(const CRecipient &recipient, vecSend)
                  {
                      CTxOut txout(recipient.nAmount, recipient.scriptPubKey);
                      LogPrintf("txout:%s\n", txout.ToString());
  
  //                    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(vAvailableCoins, nValueToSelect, setCoins, nValueIn, coinControl)) {
                      if (nValueIn < nValueToSelect) {
                          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;
                  }
  
                  CAmount nChange = nValueIn - nValueToSelect;
                  // NOTE: this depends on the exact behaviour of GetMinFee
                  if (nFeeRet < CTransaction::nMinTxFee && nChange > 0 && nChange < CENT) {
                      int64_t nMoveToFee = min(nChange, CTransaction::nMinTxFee - nFeeRet);
                      nChange -= nMoveToFee;
                      nFeeRet += nMoveToFee;
                  }
                  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);
                      }
                          // send change to one of the specified change addresses
                      else if (mapArgs.count("-change") && mapMultiArgs["-change"].size() > 0) {
                          CBitcoinAddress
                          address(mapMultiArgs["-change"][GetRandInt(mapMultiArgs["-change"].size())]);
                          CKeyID keyID;
                          if (!address.GetKeyID(keyID)) {
                              strFailReason = _("Bad change address");
                              return false;
                          }
                          scriptChange = GetScriptForDestination(keyID);
                      }
                          // 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);
                          if (!ret) {
                              strFailReason = _("Keypool ran out, please call keypoolrefill first");
                              return false;
                          }
  
                          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)) {
                          nChangePosInOut = -1;
                          nFeeRet += nChange;
                          reservekey.ReturnKey();
                      } else {
                          if (nChangePosInOut == -1) {
                              // Insert change txn at random position:
                              nChangePosInOut = GetRandInt(txNew.vout.size() + 1);
                          } else if ((unsigned int) nChangePosInOut > txNew.vout.size()) {
                              strFailReason = _("Change index out of range");
                              return false;
                          }
  
                          vector<CTxOut>::iterator position = txNew.vout.begin() + nChangePosInOut;
                          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;
                      SignatureData sigdata;
                      if (sign)
                          signSuccess = ProduceSignature(TransactionSignatureCreator(this, &txNewConst, nIn,
                                                                                     coin.first->vout[coin.second].nValue,
                                                                                     SIGHASH_ALL), scriptPubKey,
                                                         sigdata);
                      else
                          signSuccess = ProduceSignature(DummySignatureCreator(this), scriptPubKey, sigdata);
  
                      if (!signSuccess) {
                          strFailReason = _("Signing transaction failed");
                          return false;
                      } else {
                          UpdateTransaction(txNew, nIn, sigdata);
                      }
                      nIn++;
                  }
                  unsigned int nBytes = GetVirtualTransactionSize(txNew);
                  // Remove scriptSigs if we used dummy signatures for fee calculation
                  if (!sign) {
                      BOOST_FOREACH(CTxIn & vin, txNew.vin)
                      vin.scriptSig = CScript();
                      txNew.wit.SetNull();
                  }
                  // Embed the constructed transaction data in wtxNew.
                  *static_cast<CTransaction *>(&wtxNew) = CTransaction(txNew);
  
                  // Limit size
                  if (GetTransactionWeight(txNew) >= MAX_STANDARD_TX_WEIGHT) {
                      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;
                  }
                  int64_t nPayFee = payTxFee.GetFeePerK() * (1 + (int64_t) GetTransactionWeight(txNew) / 1000);
  //                bool fAllowFree = false;					// No free TXs in NOI
                  int64_t nMinFee = wtxNew.GetMinFee(1, false, GMF_SEND);
  
                  int64_t nFeeNeeded = nPayFee;
                  if (nFeeNeeded < nMinFee) {
                      nFeeNeeded = nMinFee;
                  }
  //                LogPrintf("nFeeNeeded=%s\n", nFeeNeeded);
  //                if (coinControl && nFeeNeeded > 0 && coinControl->nMinimumTotalFee > nFeeNeeded) {
  //                    nFeeNeeded = coinControl->nMinimumTotalFee;
  //                }
  //                LogPrintf("nFeeNeeded=%s\n", nFeeNeeded);
  //                if (coinControl && coinControl->fOverrideFeeRate)
  //                    nFeeNeeded = coinControl->nFeeRate.GetFee(nBytes);
  //                LogPrintf("nFeeNeeded=%s\n", nFeeNeeded);
  //                LogPrintf("nFeeRet=%s\n", nFeeRet);
                  // 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;
              }
          }
      }
  
      if (GetBoolArg("-walletrejectlongchains", DEFAULT_WALLET_REJECT_LONG_CHAINS)) {
          // Lastly, ensure this tx will pass the mempool's chain limits
          LockPoints lp;
          CTxMemPoolEntry entry(txNew, 0, 0, 0, 0, false, 0, false, 0, lp);
          CTxMemPool::setEntries setAncestors;
          size_t nLimitAncestors = GetArg("-limitancestorcount", DEFAULT_ANCESTOR_LIMIT);
          size_t nLimitAncestorSize = GetArg("-limitancestorsize", DEFAULT_ANCESTOR_SIZE_LIMIT) * 1000;
          size_t nLimitDescendants = GetArg("-limitdescendantcount", DEFAULT_DESCENDANT_LIMIT);
          size_t nLimitDescendantSize = GetArg("-limitdescendantsize", DEFAULT_DESCENDANT_SIZE_LIMIT) * 1000;
          std::string errString;
          if (!mempool.CalculateMemPoolAncestors(entry, setAncestors, nLimitAncestors, nLimitAncestorSize,
                                                 nLimitDescendants, nLimitDescendantSize, errString)) {
              strFailReason = _("Transaction has too long of a mempool chain");
              return false;
          }
      }
      return true;
  }
  
  bool
  CWallet::CreateZerocoinMintTransaction(CScript pubCoin, int64_t nValue, CWalletTx &wtxNew, CReserveKey &reservekey,
                                         int64_t &nFeeRet, std::string &strFailReason,
                                         const CCoinControl *coinControl) {
      vector <CRecipient> vecSend;
      CRecipient recipient = {pubCoin, nValue, false};
      vecSend.push_back(recipient);
      int nChangePosRet = -1;
      return CreateZerocoinMintTransaction(vecSend, wtxNew, reservekey, nFeeRet, nChangePosRet, strFailReason,
                                           coinControl);
  }
  
  /**
   * @brief CWallet::CreateZerocoinSpendTransaction
   * @param nValue
   * @param denomination
   * @param wtxNew
   * @param reservekey
   * @param coinSerial
   * @param txHash
   * @param zcSelectedValue
   * @param zcSelectedIsUsed
   * @param strFailReason
   * @return
   */
  bool CWallet::CreateZerocoinSpendTransaction(std::string &thirdPartyaddress, int64_t nValue, libzerocoin::CoinDenomination denomination,
                                               CWalletTx &wtxNew, CReserveKey &reservekey, CBigNum &coinSerial,
                                               uint256 &txHash, CBigNum &zcSelectedValue, bool &zcSelectedIsUsed,
                                               std::string &strFailReason, bool forceUsed) {
      if (nValue <= 0) {
          strFailReason = _("Transaction amounts must be positive");
          return false;
      }
  
      wtxNew.BindWallet(this);
      CMutableTransaction txNew;
      {
          LOCK2(cs_main, cs_wallet);
          {
              txNew.vin.clear();
              txNew.vout.clear();
              txNew.wit.SetNull();
              //wtxNew.fFromMe = true;
  
              CScript scriptChange;
  
              if(thirdPartyaddress == ""){
                  // Reserve a new key pair from key pool
                  CPubKey vchPubKey;
                  assert(reservekey.GetReservedKey(vchPubKey)); // should never fail, as we just unlocked
                  scriptChange = GetScriptForDestination(vchPubKey.GetID());
              }else{
                  CBitcoinAddress address(thirdPartyaddress);
                  if (!address.IsValid()){
                      strFailReason = _("Invalid Noir address");
                      return false;
                  }
                  // Parse Noir address
                  scriptChange = GetScriptForDestination(CBitcoinAddress(thirdPartyaddress).Get());
              }
  
              CTxOut newTxOut(nValue, scriptChange);
  
              // Insert change txn at random position:
              vector<CTxOut>::iterator position = txNew.vout.begin() + GetRandInt(txNew.vout.size() + 1);
              txNew.vout.insert(position, newTxOut);
  //            LogPrintf("txNew:%s\n", txNew.ToString());
              LogPrintf("txNew.GetHash():%s\n", txNew.GetHash().ToString());
  
              // Fill vin
  
              // Set up the Zerocoin Params object
              bool fModulusV2 = chainActive.Height() >= Params().nModulusV2StartBlock;
              libzerocoin::Params *zcParams = fModulusV2 ? ZCParamsV2 : ZCParams;
              // Select not yet used coin from the wallet with minimal possible id
  
              list <CZerocoinEntry> listPubCoin;
              CWalletDB(strWalletFile).ListPubCoin(listPubCoin);
              listPubCoin.sort(CompHeight);
              CZerocoinEntry coinToUse;
              CZerocoinState *zerocoinState = CZerocoinState::GetZerocoinState();
  
              CBigNum accumulatorValue;
              uint256 accumulatorBlockHash;      // to be used in zerocoin spend v2
  
              int coinId = INT_MAX;
              int coinHeight;
  
              BOOST_FOREACH(const CZerocoinEntry &minIdPubcoin, listPubCoin) {
                  if (minIdPubcoin.denomination == denomination
                          && ((minIdPubcoin.IsUsed == false && !forceUsed) || (minIdPubcoin.IsUsed == true && forceUsed))
                          && minIdPubcoin.randomness != 0
                          && minIdPubcoin.serialNumber != 0) {
                      int id;
                      coinHeight = zerocoinState->GetMintedCoinHeightAndId(minIdPubcoin.value, minIdPubcoin.denomination, id);
                      LogPrintf("ZEROCOIN, denom %d, id %d, height %d \n" ,minIdPubcoin.value, id, coinHeight);
                      if (coinHeight > 0
                              && id < coinId
                              && coinHeight + (ZC_MINT_CONFIRMATIONS-1) <= chainActive.Height()
                              && zerocoinState->GetAccumulatorValueForSpend(
                                      &chainActive,
                                      chainActive.Height()-(ZC_MINT_CONFIRMATIONS-1),
                                      denomination,
                                      id,
                                      accumulatorValue,
                                      accumulatorBlockHash,
                                      fModulusV2) > 1
                              ) {
                          coinId = id;
                          coinToUse = minIdPubcoin;
                      }
                  }
              }
  
              if (coinId == INT_MAX){
                  strFailReason = _("it has to have at least two mint coins with at least 6 confirmation in order to spend a coin");
                  return false;
              }
  
              libzerocoin::Accumulator accumulator(zcParams, accumulatorValue, denomination);
              // 2. Get pubcoin from the private coin
              libzerocoin::PublicCoin pubCoinSelected(zcParams, coinToUse.value, denomination);
  
              // Now make sure the coin is valid.
              if (!pubCoinSelected.validate()) {
                  // If this returns false, don't accept the coin for any purpose!
                  // Any ZEROCOIN_MINT with an invalid coin should NOT be
                  // accepted as a valid transaction in the block chain.
                  strFailReason = _("the selected mint coin is an invalid coin");
                  return false;
              }
  
              // 4. Generate withness
              libzerocoin::AccumulatorWitness witness =
                      zerocoinState->GetWitnessForSpend(&chainActive,
                                                        chainActive.Height()-(ZC_MINT_CONFIRMATIONS-1),
                                                        denomination, coinId,
                                                        coinToUse.value,
                                                        fModulusV2);
               int serializedId = coinId + (fModulusV2 ? ZC_MODULUS_V2_BASE_ID : 0);
  
              CTxIn newTxIn;
              newTxIn.nSequence = serializedId;
              newTxIn.scriptSig = CScript();
              newTxIn.prevout.SetNull();
              txNew.vin.push_back(newTxIn);
  
              bool useVersion2 = IsZerocoinTxV2(denomination, coinId);
  
              // We use incomplete transaction hash for now as a metadata
              libzerocoin::SpendMetaData metaData(serializedId, txNew.GetHash());
  
              // Construct the CoinSpend object. This acts like a signature on the
              // transaction.
              libzerocoin::PrivateCoin privateCoin(zcParams, denomination);
  
  
              int txVersion = ZEROCOIN_TX_VERSION_1;
              if (useVersion2) {
                  // Use version 2 if possible, for older mints stay with 1.5
                  txVersion = coinToUse.IsCorrectV2Mint() ? ZEROCOIN_TX_VERSION_2 : ZEROCOIN_TX_VERSION_1_5;
              }
              else {
                  bool fTestNet = (Params().NetworkIDString() == CBaseChainParams::TESTNET);
                  int nHeight;
                  {
                      LOCK(cs_main);
                      nHeight = chainActive.Height();
                  }
                  if ((!fTestNet && nHeight >= ZC_V1_5_STARTING_BLOCK) || (fTestNet && nHeight >= ZC_V1_5_TESTNET_STARTING_BLOCK))
                      txVersion = ZEROCOIN_TX_VERSION_1_5;
              }
  
              LogPrintf("CreateZerocoinSpendTransation: tx version=%d, tx metadata hash=%s\n", txVersion, txNew.GetHash().ToString());
               
              privateCoin.setVersion(txVersion);
              privateCoin.setPublicCoin(pubCoinSelected);
              privateCoin.setRandomness(coinToUse.randomness);
              privateCoin.setSerialNumber(coinToUse.serialNumber);
              privateCoin.setEcdsaSeckey(coinToUse.ecdsaSecretKey);
               
              libzerocoin::CoinSpend spend(zcParams, privateCoin, accumulator, witness, metaData, accumulatorBlockHash);
              spend.setVersion(txVersion);
              // This is a sanity check. The CoinSpend object should always verify,
              // but why not check before we put it onto the wire?
              if (!spend.Verify(accumulator, metaData)) {
                  strFailReason = _("the spend coin transaction did not verify");
                  return false;
              }
  
              // Serialize the CoinSpend object into a buffer.
              CDataStream serializedCoinSpend(SER_NETWORK, PROTOCOL_VERSION);
              serializedCoinSpend << spend;
  
              CScript tmp = CScript() << OP_ZEROCOINSPEND << serializedCoinSpend.size();
              tmp.insert(tmp.end(), serializedCoinSpend.begin(), serializedCoinSpend.end());
              txNew.vin[0].scriptSig.assign(tmp.begin(), tmp.end());
  
              // Embed the constructed transaction data in wtxNew.
              *static_cast<CTransaction *>(&wtxNew) = CTransaction(txNew);
  
              // Limit size
              if (GetTransactionWeight(txNew) >= MAX_STANDARD_TX_WEIGHT) {
                  strFailReason = _("Transaction too large");
                  return false;
              }
  
              /*zerocoinSelected.IsUsed = true;
          zerocoinSelected.randomness = 0;
          zerocoinSelected.serialNumber = 0;
          CWalletDB(strWalletFile).WriteZerocoinEntry(zerocoinSelected);*/
  
              std::list <CZerocoinSpendEntry> listCoinSpendSerial;
              CWalletDB(strWalletFile).ListCoinSpendSerial(listCoinSpendSerial);
              BOOST_FOREACH(const CZerocoinSpendEntry &item, listCoinSpendSerial){
                  if (!forceUsed && spend.getCoinSerialNumber() == item.coinSerial) {
                      // THIS SELECEDTED COIN HAS BEEN USED, SO UPDATE ITS STATUS
                      CZerocoinEntry pubCoinTx;
                      pubCoinTx.nHeight = coinHeight;
                      pubCoinTx.denomination = coinToUse.denomination;
                      pubCoinTx.id = coinId;
                      pubCoinTx.IsUsed = true;
                      pubCoinTx.randomness = coinToUse.randomness;
                      pubCoinTx.serialNumber = coinToUse.serialNumber;
                      pubCoinTx.value = coinToUse.value;
                      pubCoinTx.ecdsaSecretKey = coinToUse.ecdsaSecretKey;
                      CWalletDB(strWalletFile).WriteZerocoinEntry(pubCoinTx);
                      LogPrintf("CreateZerocoinSpendTransaction() -> NotifyZerocoinChanged\n");
                      LogPrintf("pubcoin=%s, isUsed=Used\n", coinToUse.value.GetHex());
                      pwalletMain->NotifyZerocoinChanged(pwalletMain, coinToUse.value.GetHex(), "Used(" + std::to_string(pubCoinTx.denomination) + " mint)", CT_UPDATED);
                      strFailReason = _("the coin spend has been used");
                      return false;
                  }
              }
  
              coinSerial = spend.getCoinSerialNumber();
              txHash = wtxNew.GetHash();
              LogPrintf("txHash:\n%s", txHash.ToString());
              zcSelectedValue = coinToUse.value;
              zcSelectedIsUsed = coinToUse.IsUsed;
  
              CZerocoinSpendEntry entry;
              entry.coinSerial = coinSerial;
              entry.hashTx = txHash;
              entry.pubCoin = zcSelectedValue;
              entry.id = serializedId;
              entry.denomination = coinToUse.denomination;
              LogPrintf("WriteCoinSpendSerialEntry, serialNumber=%s\n", coinSerial.ToString());
              if (!CWalletDB(strWalletFile).WriteCoinSpendSerialEntry(entry)) {
                  strFailReason = _("it cannot write coin serial number into wallet");
              }
  
              coinToUse.IsUsed = true;
              coinToUse.id = coinId;
              coinToUse.nHeight = coinHeight;
              CWalletDB(strWalletFile).WriteZerocoinEntry(coinToUse);
              pwalletMain->NotifyZerocoinChanged(pwalletMain, coinToUse.value.GetHex(), "Used (" + std::to_string(entry.denomination) + " mint)", CT_UPDATED);
          }
      }
  
      return true;
  }
  
  bool CWallet::CommitZerocoinSpendTransaction(CWalletTx &wtxNew, CReserveKey &reservekey) {
      {
          LOCK2(cs_main, cs_wallet);
          LogPrintf("CommitZerocoinSpendTransaction:\n%s", wtxNew.ToString());
          LogPrintf("Transaction ID:%s\n", wtxNew.GetHash().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, "w") : 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);
  
              if (fFileBacked)
                  delete pwalletdb;
          }
  
          // Track how many getdata requests our transaction gets
          mapRequestCount[wtxNew.GetHash()] = 0;
  
          if (fBroadcastTransactions) {
              CValidationState state;
              // Broadcast
              if (!wtxNew.AcceptToMemoryPool(false, maxTxFee, state, false)) {
                  LogPrintf("CommitZerocoinSpendTransaction(): Transaction cannot be broadcast immediately, %s\n",
                            state.GetRejectReason());
                  // TODO: if we expect the failure to be long term or permanent, instead delete wtx from the wallet and return failure.
              } else {
                  wtxNew.RelayWalletTransaction(false);
              }
          }
      }
      return true;
  }
  
  /**
   * @brief CWallet::MintZerocoin
   * @param pubCoin
   * @param nValue
   * @param wtxNew
   * @param fAskFee
   * @return
   */
  string CWallet::MintZerocoin(CScript pubCoin, int64_t nValue, CWalletTx &wtxNew, bool fAskFee) {
      // Do not allow mint to take place until fully synced
      // Temporary measure: we can remove this limitation when well after spend v1.5 HF block
      if (fImporting || fReindex || !noirnodeSync.IsBlockchainSynced())
          return _("Not fully synced yet");
  
      LogPrintf("MintZerocoin: value = %s\n", nValue);
      // Check amount
      if (nValue <= 0)
          return _("Invalid amount");
      LogPrintf("CWallet.MintZerocoin() nValue = %s, payTxFee.GetFee(1000) = %s, GetBalance() = %s \n", nValue,
                payTxFee.GetFee(1000), GetBalance());
      if (nValue + payTxFee.GetFeePerK() > GetBalance())
          return _("Insufficient funds");
      LogPrintf("payTxFee.GetFeePerK()=%s\n", payTxFee.GetFeePerK());
      CReserveKey reservekey(this);
      int64_t nFeeRequired;
  
      if (IsLocked()) {
          string strError = _("Error: Wallet locked, unable to create transaction!");
          LogPrintf("MintZerocoin() : %s", strError);
          return strError;
      }
  
      string strError;
      if (!CreateZerocoinMintTransaction(pubCoin, nValue, wtxNew, reservekey, nFeeRequired, strError)) {
          LogPrintf("nFeeRequired=%s\n", nFeeRequired);
          if (nValue + nFeeRequired > GetBalance())
              return strprintf(
                      _("Error: This transaction requires a transaction fee of at least %s because of its amount, complexity, or use of recently received funds!"),
                      FormatMoney(nFeeRequired).c_str());
          return strError;
      }
  
      if (fAskFee && !uiInterface.ThreadSafeAskFee(nFeeRequired))
          return "ABORTED";
  
      if (!CommitTransaction(wtxNew, reservekey)) {
          return _(
                  "Error: The transaction was rejected! This might happen if some of the coins in your wallet were already spent, such as if you used a copy of wallet.dat and coins were spent in the copy but not marked as spent here.");
      } else {
          LogPrintf("CommitTransaction success!\n");
  //        //TODO :
  //        // 1. In this case, we already have pubcoin that just committed to network.
  //        // 2. what we can do is <pubcoin><isOur><isUsed> storing in wallet
  //        // 3. We will store pubcoin, yes, no
      }
  
      return "";
  }
  
  /**
   * @brief CWallet::SpendZerocoin
   * @param nValue
   * @param denomination
   * @param wtxNew
   * @param coinSerial
   * @param txHash
   * @param zcSelectedValue
   * @param zcSelectedIsUsed
   * @return
   */
  string CWallet::SpendZerocoin(std::string &thirdPartyaddress, int64_t nValue, libzerocoin::CoinDenomination denomination, CWalletTx &wtxNew,
                                CBigNum &coinSerial, uint256 &txHash, CBigNum &zcSelectedValue,
                                bool &zcSelectedIsUsed, bool forceUsed) {
      // Check amount
      if (nValue <= 0)
          return _("Invalid amount");
  
  
      // Do not allow spend to take place until fully synced
      // Temporary measure: we can remove this limitation when well after spend v1.5 HF block
      if (fImporting || fReindex || !noirnodeSync.IsBlockchainSynced())
          return _("Not fully synced yet");
  
      CReserveKey reservekey(this);
  
      if (IsLocked()) {
          string strError = _("Error: Wallet locked, unable to create transaction!");
          LogPrintf("SpendZerocoin() : %s", strError);
          return strError;
      }
  
      string strError;
      if (!CreateZerocoinSpendTransaction(thirdPartyaddress, nValue, denomination, wtxNew, reservekey, coinSerial, txHash,
                                          zcSelectedValue, zcSelectedIsUsed, strError, forceUsed)) {
          LogPrintf("SpendZerocoin() : %s\n", strError.c_str());
          return strError;
      }
  
      if (!CommitZerocoinSpendTransaction(wtxNew, reservekey)) {
          LogPrintf("CommitZerocoinSpendTransaction() -> FAILED!\n");
          CZerocoinEntry pubCoinTx;
          list <CZerocoinEntry> listPubCoin;
          listPubCoin.clear();
  
          CWalletDB walletdb(pwalletMain->strWalletFile);
          walletdb.ListPubCoin(listPubCoin);
          BOOST_FOREACH(const CZerocoinEntry &pubCoinItem, listPubCoin) {
              if (zcSelectedValue == pubCoinItem.value) {
                  pubCoinTx.id = pubCoinItem.id;
                  pubCoinTx.IsUsed = false; // having error, so set to false, to be able to use again
                  pubCoinTx.value = pubCoinItem.value;
                  pubCoinTx.nHeight = pubCoinItem.nHeight;
                  pubCoinTx.randomness = pubCoinItem.randomness;
                  pubCoinTx.serialNumber = pubCoinItem.serialNumber;
                  pubCoinTx.denomination = pubCoinItem.denomination;
                  pubCoinTx.ecdsaSecretKey = pubCoinItem.ecdsaSecretKey;
                  CWalletDB(strWalletFile).WriteZerocoinEntry(pubCoinTx);
                  LogPrintf("SpendZerocoin failed, re-updated status -> NotifyZerocoinChanged\n");
                  LogPrintf("pubcoin=%s, isUsed=New\n", pubCoinItem.value.GetHex());
                  pwalletMain->NotifyZerocoinChanged(pwalletMain, pubCoinItem.value.GetHex(), "New (" + std::to_string(pubCoinTx.denomination) + " mint)", CT_UPDATED);
              }
          }
          CZerocoinSpendEntry entry;
          entry.coinSerial = coinSerial;
          entry.hashTx = txHash;
          entry.pubCoin = zcSelectedValue;
          if (!CWalletDB(strWalletFile).EraseCoinSpendSerialEntry(entry)) {
              return _("Error: It cannot delete coin serial number in wallet");
          }
          return _(
                  "Error: The transaction was rejected! This might happen if some of the coins in your wallet were already spent, such as if you used a copy of wallet.dat and coins were spent in the copy but not marked as spent here.");
      }
      return "";
  }
  
  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 estimatefee, then use fallbackFee
          if (nFeeNeeded == 0)
              nFeeNeeded = fallbackFee.GetFee(nTxBytes);
      }
      // prevent user from paying a fee below minRelayTxFee or minTxFee
      nFeeNeeded = std::max(nFeeNeeded, GetRequiredFee(nTxBytes));
      // But always obey the maximum
      if (nFeeNeeded > maxTxFee)
          nFeeNeeded = maxTxFee;
      return nFeeNeeded;
  }
  
  
  DBErrors CWallet::LoadWallet(bool &fFirstRunRet) {
      LogPrintf("LoadWallet, firstRun = %s\n", 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::ZapSelectTx(vector <uint256> &vHashIn, vector <uint256> &vHashOut) {
      if (!fFileBacked)
          return DB_LOAD_OK;
      DBErrors nZapSelectTxRet = CWalletDB(strWalletFile, "cr+").ZapSelectTx(this, vHashIn, vHashOut);
      if (nZapSelectTxRet == 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 (nZapSelectTxRet != DB_LOAD_OK)
          return nZapSelectTxRet;
  
      MarkDirty();
  
      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(std::string(__func__) + ": 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(std::string(__func__) + ": read failed");
          if (!HaveKey(keypool.vchPubKey.GetID()))
              throw runtime_error(std::string(__func__) + ": 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() {
      LOCK(cs_wallet);
  
      // if the keypool is empty, return <NOW>
      if (setKeyPool.empty())
          return GetTime();
  
      // load oldest key from keypool, get time and return
      CKeyPool keypool;
      CWalletDB walletdb(strWalletFile);
      int64_t nIndex = *(setKeyPool.begin());
      if (!walletdb.ReadPool(nIndex, keypool))
          throw runtime_error(std::string(__func__) + ": read oldest key in keypool failed");
      assert(keypool.vchPubKey.IsValid());
      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;
  }
  
  CAmount CWallet::GetAccountBalance(const std::string &strAccount, int nMinDepth, const isminefilter &filter) {
      CWalletDB walletdb(strWalletFile);
      return GetAccountBalance(walletdb, strAccount, nMinDepth, filter);
  }
  
  CAmount CWallet::GetAccountBalance(CWalletDB &walletdb, const std::string &strAccount, int nMinDepth,
                                     const isminefilter &filter) {
      CAmount nBalance = 0;
  
      // Tally wallet transactions
      for (map<uint256, CWalletTx>::iterator it = mapWallet.begin(); it != mapWallet.end(); ++it) {
          const CWalletTx &wtx = (*it).second;
          if (!CheckFinalTx(wtx) || wtx.GetBlocksToMaturity() > 0 || wtx.GetDepthInMainChain() < 0)
              continue;
  
          CAmount nReceived, nSent, nFee;
          wtx.GetAccountAmounts(strAccount, nReceived, nSent, nFee, filter);
  
          if (nReceived != 0 && wtx.GetDepthInMainChain() >= nMinDepth)
              nBalance += nReceived;
          nBalance -= nSent + nFee;
      }
  
      // Tally internal accounting entries
      nBalance += walletdb.GetAccountCreditDebit(strAccount);
  
      return nBalance;
  }
  
  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(std::string(__func__) + ": read failed");
          assert(keypool.vchPubKey.IsValid());
          CKeyID keyID = keypool.vchPubKey.GetID();
          if (!HaveKey(keyID))
              throw runtime_error(std::string(__func__) + ": 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(const COutPoint &output) {
      AssertLockHeld(cs_wallet); // setLockedCoins
      setLockedCoins.insert(output);
  }
  
  void CWallet::UnlockCoin(const 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 reorganized; 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;
  }
  
  std::string CWallet::GetWalletHelpString(bool showDebug) {
      std::string strUsage = HelpMessageGroup(_("Wallet options:"));
      strUsage += HelpMessageOpt("-disablewallet", _("Do not load the wallet and disable wallet RPC calls"));
      strUsage += HelpMessageOpt("-keypool=<n>",
                                 strprintf(_("Set key pool size to <n> (default: %u)"), DEFAULT_KEYPOOL_SIZE));
      strUsage += HelpMessageOpt("-fallbackfee=<amt>", strprintf(
              _("A fee rate (in %s/kB) that will be used when fee estimation has insufficient data (default: %s)"),
              CURRENCY_UNIT, FormatMoney(DEFAULT_FALLBACK_FEE)));
      strUsage += HelpMessageOpt("-mintxfee=<amt>", strprintf(
              _("Fees (in %s/kB) smaller than this are considered zero fee for transaction creation (default: %s)"),
              CURRENCY_UNIT, FormatMoney(DEFAULT_TRANSACTION_MINFEE)));
      strUsage += HelpMessageOpt("-paytxfee=<amt>",
                                 strprintf(_("Fee (in %s/kB) to add to transactions you send (default: %s)"),
                                           CURRENCY_UNIT, FormatMoney(payTxFee.GetFeePerK())));
      strUsage += HelpMessageOpt("-rescan", _("Rescan the block chain for missing wallet transactions on startup"));
      strUsage += HelpMessageOpt("-salvagewallet",
                                 _("Attempt to recover private keys from a corrupt wallet on startup"));
      if (showDebug)
          strUsage += HelpMessageOpt("-sendfreetransactions",
                                     strprintf(
                                             _("Send transactions as zero-fee transactions if possible (default: %u)"),
                                             DEFAULT_SEND_FREE_TRANSACTIONS));
      strUsage += HelpMessageOpt("-spendzeroconfchange",
                                 strprintf(_("Spend unconfirmed change when sending transactions (default: %u)"),
                                           DEFAULT_SPEND_ZEROCONF_CHANGE));
      strUsage += HelpMessageOpt("-txconfirmtarget=<n>", strprintf(
              _("If paytxfee is not set, include enough fee so transactions begin confirmation on average within n blocks (default: %u)"),
              DEFAULT_TX_CONFIRM_TARGET));
      strUsage += HelpMessageOpt("-usehd",
                                 _("Use hierarchical deterministic key generation (HD) after BIP32. Only has effect during wallet creation/first start") +
                                 " " + strprintf(_("(default: %u)"), DEFAULT_USE_HD_WALLET));
      strUsage += HelpMessageOpt("-upgradewallet", _("Upgrade wallet to latest format on startup"));
      strUsage += HelpMessageOpt("-wallet=<file>", _("Specify wallet file (within data directory)") + " " +
                                                   strprintf(_("(default: %s)"), DEFAULT_WALLET_DAT));
      strUsage += HelpMessageOpt("-walletbroadcast", _("Make the wallet broadcast transactions") + " " +
                                                     strprintf(_("(default: %u)"), DEFAULT_WALLETBROADCAST));
      strUsage += HelpMessageOpt("-walletnotify=<cmd>",
                                 _("Execute command when a wallet transaction changes (%s in cmd is replaced by TxID)"));
      strUsage += HelpMessageOpt("-zapwallettxes=<mode>",
                                 _("Delete all wallet transactions and only recover those parts of the blockchain through -rescan on startup") +
                                 " " +
                                 _("(1 = keep tx meta data e.g. account owner and payment request information, 2 = drop tx meta data)"));
  
      if (showDebug) {
          strUsage += HelpMessageGroup(_("Wallet debugging/testing options:"));
  
          strUsage += HelpMessageOpt("-dblogsize=<n>", strprintf(
                  "Flush wallet database activity from memory to disk log every <n> megabytes (default: %u)",
                  DEFAULT_WALLET_DBLOGSIZE));
          strUsage += HelpMessageOpt("-flushwallet",
                                     strprintf("Run a thread to flush wallet periodically (default: %u)",
                                               DEFAULT_FLUSHWALLET));
          strUsage += HelpMessageOpt("-privdb",
                                     strprintf("Sets the DB_PRIVATE flag in the wallet db environment (default: %u)",
                                               DEFAULT_WALLET_PRIVDB));
          strUsage += HelpMessageOpt("-walletrejectlongchains", strprintf(
                  _("Wallet will not create transactions that violate mempool chain limits (default: %u"),
                  DEFAULT_WALLET_REJECT_LONG_CHAINS));
      }
  
      return strUsage;
  }
  
  
  bool CWallet::InitLoadWallet() {
      LogPrintf("InitLoadWallet()\n");
      std::string walletFile = GetArg("-wallet", DEFAULT_WALLET_DAT);
  
      // needed to restore wallet transaction meta data after -zapwallettxes
      std::vector <CWalletTx> vWtx;
  
      if (GetBoolArg("-zapwallettxes", false)) {
          uiInterface.InitMessage(_("Zapping all transactions from wallet..."));
  
          CWallet *tempWallet = new CWallet(walletFile);
          DBErrors nZapWalletRet = tempWallet->ZapWalletTx(vWtx);
          if (nZapWalletRet != DB_LOAD_OK) {
              return InitError(strprintf(_("Error loading %s: Wallet corrupted"), walletFile));
          }
  
          delete tempWallet;
          tempWallet = NULL;
      }
  
      uiInterface.InitMessage(_("Loading wallet..."));
      int64_t nStart = GetTimeMillis();
      bool fFirstRun = true;
      CWallet *walletInstance = new CWallet(walletFile);
      pwalletMain = walletInstance;
  
      DBErrors nLoadWalletRet = walletInstance->LoadWallet(fFirstRun);
      LogPrintf("Load done!\n");
      if (nLoadWalletRet != DB_LOAD_OK) {
          if (nLoadWalletRet == DB_CORRUPT)
              return InitError(strprintf(_("Error loading %s: Wallet corrupted"), walletFile));
          else if (nLoadWalletRet == DB_NONCRITICAL_ERROR) {
              InitWarning(strprintf(_("Error reading %s! All keys read correctly, but transaction data"
                                              " or address book entries might be missing or incorrect."),
                                    walletFile));
          } else if (nLoadWalletRet == DB_TOO_NEW)
              return InitError(strprintf(_("Error loading %s: Wallet requires newer version of %s"),
                                         walletFile, _(PACKAGE_NAME)));
          else if (nLoadWalletRet == DB_NEED_REWRITE) {
              return InitError(
                      strprintf(_("Wallet needed to be rewritten: restart %s to complete"), _(PACKAGE_NAME)));
          } else
              return InitError(strprintf(_("Error loading %s"), walletFile));
      }
  
      if (GetBoolArg("-upgradewallet", fFirstRun)) {
          int nMaxVersion = GetArg("-upgradewallet", 0);
          if (nMaxVersion == 0) // the -upgradewallet without argument case
          {
              LogPrintf("Performing wallet upgrade to %i\n", FEATURE_LATEST);
              nMaxVersion = CLIENT_VERSION;
              walletInstance->SetMinVersion(FEATURE_LATEST); // permanently upgrade the wallet immediately
          } else
              LogPrintf("Allowing wallet upgrade up to %i\n", nMaxVersion);
          if (nMaxVersion < walletInstance->GetVersion()) {
              return InitError(_("Cannot downgrade wallet"));
          }
          walletInstance->SetMaxVersion(nMaxVersion);
      }
  
      if (fFirstRun) {
          // Create new keyUser and set as default key
          if (GetBoolArg("-usehd", DEFAULT_USE_HD_WALLET) && walletInstance->hdChain.masterKeyID.IsNull()) {
              // generate a new master key
              CPubKey masterPubKey = walletInstance->GenerateNewHDMasterKey();
              if (!walletInstance->SetHDMasterKey(masterPubKey))
                  throw std::runtime_error(std::string(__func__) + ": Storing master key failed");
          }
          CPubKey newDefaultKey;
          if (walletInstance->GetKeyFromPool(newDefaultKey)) {
              walletInstance->SetDefaultKey(newDefaultKey);
              if (!walletInstance->SetAddressBook(walletInstance->vchDefaultKey.GetID(), "", "receive"))
                  return InitError(_("Cannot write default address") += "\n");
          }
  
          walletInstance->SetBestChain(chainActive.GetLocator());
      } else if (mapArgs.count("-usehd")) {
          bool useHD = GetBoolArg("-usehd", DEFAULT_USE_HD_WALLET);
          if (!walletInstance->hdChain.masterKeyID.IsNull() && !useHD)
              return InitError(
                      strprintf(_("Error loading %s: You can't disable HD on a already existing HD wallet"),
                                walletFile));
          if (walletInstance->hdChain.masterKeyID.IsNull() && useHD)
              return InitError(
                      strprintf(_("Error loading %s: You can't enable HD on a already existing non-HD wallet"),
                                walletFile));
      }
  
      LogPrintf(" wallet      %15dms\n", GetTimeMillis() - nStart);
  
      RegisterValidationInterface(walletInstance);
  
      CBlockIndex *pindexRescan = chainActive.Tip();
      if (GetBoolArg("-rescan", false))
          pindexRescan = chainActive.Genesis();
      else {
          CWalletDB walletdb(walletFile);
          CBlockLocator locator;
          if (walletdb.ReadBestBlock(locator))
              pindexRescan = FindForkInGlobalIndex(chainActive, locator);
          else
              pindexRescan = chainActive.Genesis();
      }
      if (chainActive.Tip() && chainActive.Tip() != pindexRescan) {
          //We can't rescan beyond non-pruned blocks, stop and throw an error
          //this might happen if a user uses a old wallet within a pruned node
          // or if he ran -disablewallet for a longer time, then decided to re-enable
          if (fPruneMode) {
              CBlockIndex *block = chainActive.Tip();
              while (block && block->pprev && (block->pprev->nStatus & BLOCK_HAVE_DATA) && block->pprev->nTx > 0 &&
                     pindexRescan != block)
                  block = block->pprev;
  
              if (pindexRescan != block)
                  return InitError(
                          _("Prune: last wallet synchronisation goes beyond pruned data. You need to -reindex (download the whole blockchain again in case of pruned node)"));
          }
  
          uiInterface.InitMessage(_("Rescanning..."));
          LogPrintf("Rescanning last %i blocks (from block %i)...\n", chainActive.Height() - pindexRescan->nHeight,
                    pindexRescan->nHeight);
          nStart = GetTimeMillis();
          walletInstance->ScanForWalletTransactions(pindexRescan, true);
          LogPrintf(" rescan      %15dms\n", GetTimeMillis() - nStart);
          walletInstance->SetBestChain(chainActive.GetLocator());
          nWalletDBUpdated++;
  
          // Restore wallet transaction metadata after -zapwallettxes=1
          if (GetBoolArg("-zapwallettxes", false) && GetArg("-zapwallettxes", "1") != "2") {
              CWalletDB walletdb(walletFile);
  
              BOOST_FOREACH(const CWalletTx &wtxOld, vWtx)
              {
                  uint256 hash = wtxOld.GetHash();
                  std::map<uint256, CWalletTx>::iterator mi = walletInstance->mapWallet.find(hash);
                  if (mi != walletInstance->mapWallet.end()) {
                      const CWalletTx *copyFrom = &wtxOld;
                      CWalletTx *copyTo = &mi->second;
                      copyTo->mapValue = copyFrom->mapValue;
                      copyTo->vOrderForm = copyFrom->vOrderForm;
                      copyTo->nTimeReceived = copyFrom->nTimeReceived;
                      copyTo->nTimeSmart = copyFrom->nTimeSmart;
                      copyTo->fFromMe = copyFrom->fFromMe;
                      copyTo->strFromAccount = copyFrom->strFromAccount;
                      copyTo->nOrderPos = copyFrom->nOrderPos;
                      walletdb.WriteTx(*copyTo);
                  }
              }
          }
      }
      walletInstance->SetBroadcastTransactions(GetBoolArg("-walletbroadcast", DEFAULT_WALLETBROADCAST));
  
      pwalletMain = walletInstance;
      return true;
  }
  
  bool CWallet::ParameterInteraction() {
      if (mapArgs.count("-mintxfee")) {
          CAmount n = 0;
          if (ParseMoney(mapArgs["-mintxfee"], n) && n > 0)
              CWallet::minTxFee = CFeeRate(n);
          else
              return InitError(AmountErrMsg("mintxfee", mapArgs["-mintxfee"]));
      }
      if (mapArgs.count("-fallbackfee")) {
          CAmount nFeePerK = 0;
          if (!ParseMoney(mapArgs["-fallbackfee"], nFeePerK))
              return InitError(
                      strprintf(_("Invalid amount for -fallbackfee=<amount>: '%s'"), mapArgs["-fallbackfee"]));
  //        if (nFeePerK > HIGH_TX_FEE_PER_KB)
  //            InitWarning(
  //                    _("-fallbackfee is set very high! This is the transaction fee you may pay when fee estimates are not available."));
          CWallet::fallbackFee = CFeeRate(nFeePerK);
      }
      if (mapArgs.count("-paytxfee")) {
          CAmount nFeePerK = 0;
          if (!ParseMoney(mapArgs["-paytxfee"], nFeePerK))
              return InitError(AmountErrMsg("paytxfee", mapArgs["-paytxfee"]));
  //        if (nFeePerK > HIGH_TX_FEE_PER_KB)
  //            InitWarning(_("-paytxfee is set very high! This is the transaction fee you will pay if you send a transaction."));
          payTxFee = CFeeRate(nFeePerK, 1000);
          if (payTxFee < ::minRelayTxFee) {
              return InitError(strprintf(_("Invalid amount for -paytxfee=<amount>: '%s' (must be at least %s)"),
                                         mapArgs["-paytxfee"], ::minRelayTxFee.ToString()));
          }
      }
      if (mapArgs.count("-maxtxfee")) {
          CAmount nMaxFee = 0;
          if (!ParseMoney(mapArgs["-maxtxfee"], nMaxFee))
              return InitError(AmountErrMsg("maxtxfee", mapArgs["-maxtxfee"]));
  //        if (nMaxFee > HIGH_MAX_TX_FEE)
  //            InitWarning(_("-maxtxfee is set very high! Fees this large could be paid on a single transaction."));
          maxTxFee = nMaxFee;
          if (CFeeRate(maxTxFee, 1000) < ::minRelayTxFee) {
              return InitError(strprintf(
                      _("Invalid amount for -maxtxfee=<amount>: '%s' (must be at least the minrelay fee of %s to prevent stuck transactions)"),
                      mapArgs["-maxtxfee"], ::minRelayTxFee.ToString()));
          }
      }
  
      if (mapArgs.count("-mininput")) {
          if (!ParseMoney(mapArgs["-mininput"], nMinimumInputValue))
              return InitError(
                      strprintf(_("Invalid amount for -mininput=<amount>: '%s'"), mapArgs["-mininput"].c_str()));
      }
  
      nTxConfirmTarget = GetArg("-txconfirmtarget", DEFAULT_TX_CONFIRM_TARGET);
      bSpendZeroConfChange = GetBoolArg("-spendzeroconfchange", DEFAULT_SPEND_ZEROCONF_CHANGE);
      fSendFreeTransactions = GetBoolArg("-sendfreetransactions", DEFAULT_SEND_FREE_TRANSACTIONS);
  
      return true;
  }
  
  bool CWallet::BackupWallet(const std::string &strDest) {
      if (!fFileBacked)
          return false;
      while (true) {
          {
              LOCK(bitdb.cs_db);
              if (!bitdb.mapFileUseCount.count(strWalletFile) || bitdb.mapFileUseCount[strWalletFile] == 0) {
                  // Flush log data to the dat file
                  bitdb.CloseDb(strWalletFile);
                  bitdb.CheckpointLSN(strWalletFile);
                  bitdb.mapFileUseCount.erase(strWalletFile);
  
                  // Copy wallet file
                  boost::filesystem::path pathSrc = GetDataDir() / strWalletFile;
                  boost::filesystem::path pathDest(strDest);
                  if (boost::filesystem::is_directory(pathDest))
                      pathDest /= strWalletFile;
  
                  try {
  #if BOOST_VERSION >= 104000
                      boost::filesystem::copy_file(pathSrc, pathDest, boost::filesystem::copy_option::overwrite_if_exists);
  #else
                      boost::filesystem::copy_file(pathSrc, pathDest);
  #endif
                      LogPrintf("copied %s to %s\n", strWalletFile, pathDest.string());
                      return true;
                  } catch (const boost::filesystem::filesystem_error &e) {
                      LogPrintf("error copying %s to %s - %s\n", strWalletFile, pathDest.string(), e.what());
                      return false;
                  }
              }
          }
          MilliSleep(100);
      }
      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, bool enableIX) const {
      int nResult;
  
      if (hashUnset())
          nResult = 0;
      else {
          AssertLockHeld(cs_main);
  
          // Find the block it claims to be in
          BlockMap::iterator mi = mapBlockIndex.find(hashBlock);
          if (mi == mapBlockIndex.end())
              nResult = 0;
          else {
              CBlockIndex *pindex = (*mi).second;
              if (!pindex || !chainActive.Contains(pindex))
                  nResult = 0;
              else {
                  pindexRet = pindex;
                  nResult = ((nIndex == -1) ? (-1) : 1) * (chainActive.Height() - pindex->nHeight + 1);
  
                  if (nResult == 0 && !mempool.exists(GetHash()))
                      return -1; // Not in chain, not in mempool
              }
          }
      }
  
      if (enableIX && nResult < 6 && instantsend.IsLockedInstantSendTransaction(GetHash()))
          return nInstantSendDepth + nResult;
  
      return nResult;
  }
  
  int CMerkleTx::GetDepthInMainChain(const CBlockIndex *&pindexRet) const {
      if (hashUnset())
          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, CAmount nAbsurdFee, CValidationState &state, bool fCheckInputs,
                                     bool isCheckWalletTransaction) {
      LogPrintf("CMerkleTx::AcceptToMemoryPool(), fCheckInputs=%s\n", fCheckInputs);
      return ::AcceptToMemoryPool(mempool, state, *this, fCheckInputs, fLimitFree, NULL, false, nAbsurdFee,
                                  isCheckWalletTransaction);
  }
  
  bool CompHeight(const CZerocoinEntry &a, const CZerocoinEntry &b) { return a.nHeight < b.nHeight; }
  
  bool CompID(const CZerocoinEntry &a, const CZerocoinEntry &b) { return a.id < b.id; }
  