text: // Copyright (c) 2009-2010 Satoshi Nakamoto
  // Copyright (c) 2009-2012 The Bitcoin developers
  // Distributed under the MIT/X11 software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include "wallet.h"
  #include "base58.h"
  #include "blockparams.h"
  #include "coincontrol.h"
  #include "kernel.h"
  #include "net.h"
  #include "util.h"
  #include "txdb.h"
  #include "ui_interface.h"
  #include "walletdb.h"
  #include "crypter.h"
  #include "key.h"
  #include "spork.h"
  #include "mnengine.h"
  #include "instantx.h"
  #include "masternodeman.h"
  #include "masternode-payments.h"
  #include "chainparams.h"
  
  #include <boost/algorithm/string/replace.hpp>
  
  using namespace std;
  
  // Settings
  int64_t nTransactionFee = MIN_TX_FEE;
  int64_t nReserveBalance = 0;
  int64_t nMinimumInputValue = 0;
  int64_t nPoSageReward = 0;
  
  int64_t GetStakeCombineThreshold() { return GetArg("-stakethreshold", 1000) * COIN; }
  static int64_t GetStakeSplitThreshold() { return 2 * GetStakeCombineThreshold(); }
  
  //////////////////////////////////////////////////////////////////////////////
  //
  // mapWallet
  //
  
  struct CompareValueOnly
  {
      bool operator()(const pair<int64_t, pair<const CWalletTx*, unsigned int> >& t1,
                      const pair<int64_t, pair<const CWalletTx*, unsigned int> >& t2) const
      {
          return t1.first < t2.first;
      }
  };
  
  const CWalletTx* CWallet::GetWalletTx(const uint256& hash) const
  {
      LOCK(cs_wallet);
      std::map<uint256, CWalletTx>::const_iterator it = mapWallet.find(hash);
      if (it == mapWallet.end())
          return NULL;
      return &(it->second);
  }
  
  CPubKey CWallet::GenerateNewKey()
  {
      AssertLockHeld(cs_wallet); // mapKeyMetadata
      bool fCompressed = CanSupportFeature(FEATURE_COMPRPUBKEY); // default to compressed public keys if we want 0.6.0 wallets
  
      CKey secret;
      secret.MakeNewKey(fCompressed);
  
      // Compressed public keys were introduced in version 0.6.0
      if (fCompressed)
          SetMinVersion(FEATURE_COMPRPUBKEY);
  
      CPubKey pubkey = secret.GetPubKey();
      assert(secret.VerifyPubKey(pubkey));
  
      // Create new metadata
      int64_t nCreationTime = GetTime();
      mapKeyMetadata[pubkey.GetID()] = CKeyMetadata(nCreationTime);
      if (!nTimeFirstKey || nCreationTime < nTimeFirstKey)
          nTimeFirstKey = nCreationTime;
  
      if (!AddKeyPubKey(secret, pubkey))
          throw std::runtime_error("CWallet::GenerateNewKey() : AddKey failed");
      return pubkey;
  }
  
  bool CWallet::AddKeyPubKey(const CKey& secret, const CPubKey &pubkey)
  {
      AssertLockHeld(cs_wallet); // mapKeyMetadata
      if (!CCryptoKeyStore::AddKeyPubKey(secret, pubkey))
          return false;
  
          // check if we need to remove from watch-only
      CScript script;
      script = GetScriptForDestination(pubkey.GetID());
      if (HaveWatchOnly(script))
          RemoveWatchOnly(script);
  
      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);
  }
  
  // optional setting to unlock wallet for staking only
  // serves to disable the trivial sendmoney when OS account compromised
  // provides no real security
  bool fWalletUnlockStakingOnly = false;
  
  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 = CAequitasCoinAddress(redeemScript.GetID()).ToString();
          LogPrintf("%s: Warning: This wallet contains a redeemScript of size %u 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.
      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::Lock()
  {
      if (IsLocked())
          return true;
  
      if (fDebug)
          printf("Locking wallet.\n");
  
      {
          LOCK(cs_wallet);
          CWalletDB wdb(strWalletFile);
  
          // -- load encrypted spend_secret of stealth addresses
          CStealthAddress sxAddrTemp;
          std::set<CStealthAddress>::iterator it;
          for (it = stealthAddresses.begin(); it != stealthAddresses.end(); ++it)
          {
              if (it->scan_secret.size() < 32)
                  continue; // stealth address is not owned
              // -- CStealthAddress are only sorted on spend_pubkey
              CStealthAddress &sxAddr = const_cast<CStealthAddress&>(*it);
              if (fDebug)
                  printf("Recrypting stealth key %s\n", sxAddr.Encoded().c_str());
  
              sxAddrTemp.scan_pubkey = sxAddr.scan_pubkey;
              if (!wdb.ReadStealthAddress(sxAddrTemp))
              {
                  printf("Error: Failed to read stealth key from db %s\n", sxAddr.Encoded().c_str());
                  continue;
              }
              sxAddr.spend_secret = sxAddrTemp.spend_secret;
          };
      }
      bool result = LockKeyStore();
      if (result)
      {
          // Reset the fWalletUnlockStakingOnly state if wallet is locked
          fWalletUnlockStakingOnly = false;
      }
      return result;
  };
  
  bool CWallet::Unlock(const SecureString& strWalletPassphrase, bool anonymizeOnly, bool stakingOnly)
  {
      SecureString strWalletPassphraseFinal;
  
      // If already fully unlocked, only update fWalletUnlockAnonymizeOnly
      // If unlocked for staking only, the passphrase is needed
      if(!IsLocked() && !fWalletUnlockStakingOnly)
      {
          fWalletUnlockAnonymizeOnly = anonymizeOnly;
          return true;
      }
  
      strWalletPassphraseFinal = strWalletPassphrase;
  
      CCrypter crypter;
      CKeyingMaterial vMasterKey;
  
      {
          LOCK(cs_wallet);
          BOOST_FOREACH(const MasterKeyMap::value_type& pMasterKey, mapMasterKeys)
          {
              if(!crypter.SetKeyFromPassphrase(strWalletPassphraseFinal, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod))
                  return false;
              if (!crypter.Decrypt(pMasterKey.second.vchCryptedKey, vMasterKey))
                  return false;
              if (!CCryptoKeyStore::Unlock(vMasterKey))
                  return false;
          break;
          }
  
          fWalletUnlockAnonymizeOnly = anonymizeOnly;
          fWalletUnlockStakingOnly = stakingOnly;
          UnlockStealthAddresses(vMasterKey);
          return true;
      }
      return false;
  }
  
  bool CWallet::ChangeWalletPassphrase(const SecureString& strOldWalletPassphrase, const SecureString& strNewWalletPassphrase)
  {
      bool fWasLocked = IsLocked();
  
      SecureString strOldWalletPassphraseFinal;
      strOldWalletPassphraseFinal = strOldWalletPassphrase;
  
      {
          LOCK(cs_wallet);
          Lock();
  
          CCrypter crypter;
          CKeyingMaterial vMasterKey;
          BOOST_FOREACH(MasterKeyMap::value_type& pMasterKey, mapMasterKeys)
          {
              if(!crypter.SetKeyFromPassphrase(strOldWalletPassphraseFinal, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod))
                  return false;
              if (!crypter.Decrypt(pMasterKey.second.vchCryptedKey, vMasterKey))
                  return false;
              if (CCryptoKeyStore::Unlock(vMasterKey)
          && UnlockStealthAddresses(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::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;
          copyTo->mapValue = copyFrom->mapValue;
          copyTo->vOrderForm = copyFrom->vOrderForm;
          // fTimeReceivedIsTxTime not copied on purpose
          // nTimeReceived not copied on purpose
          copyTo->nTimeSmart = copyFrom->nTimeSmart;
          copyTo->fFromMe = copyFrom->fFromMe;
          copyTo->strFromAccount = copyFrom->strFromAccount;
          // nOrderPos not copied on purpose
          // cached members not copied on purpose
      }
  }
  
  // Outpoint is spent if any non-conflicted transaction
  // spends it:
  bool CWallet::IsSpent(const uint256& hash, unsigned int n) const
  {
      const COutPoint outpoint(hash, n);
      pair<TxSpends::const_iterator, TxSpends::const_iterator> range;
      range = mapTxSpends.equal_range(outpoint);
  
      for (TxSpends::const_iterator it = range.first; it != range.second; ++it)
      {
          const uint256& wtxid = it->second;
          std::map<uint256, CWalletTx>::const_iterator mit = mapWallet.find(wtxid);
          if (mit != mapWallet.end() && mit->second.GetDepthInMainChain() >= 0)
              return true; // Spent
      }
      return false;
  }
  
  void CWallet::AddToSpends(const COutPoint& outpoint, const uint256& wtxid)
  {
      mapTxSpends.insert(make_pair(outpoint, wtxid));
  
      pair<TxSpends::iterator, TxSpends::iterator> range;
      range = mapTxSpends.equal_range(outpoint);
      SyncMetaData(range);
  }
  
  
  void CWallet::AddToSpends(const uint256& wtxid)
  {
      assert(mapWallet.count(wtxid));
      CWalletTx& thisTx = mapWallet[wtxid];
      if (thisTx.IsCoinBase()) // Coinbases don't spend anything!
          return;
  
      BOOST_FOREACH(const CTxIn& txin, thisTx.vin)
          AddToSpends(txin.prevout, wtxid);
  }
  
  
  bool CWallet::EncryptWallet(const SecureString& strWalletPassphrase)
  {
      if (IsCrypted())
          return false;
  
      CKeyingMaterial vMasterKey;
      RandAddSeedPerfmon();
  
      vMasterKey.resize(WALLET_CRYPTO_KEY_SIZE);
      if (!GetRandBytes(&vMasterKey[0], WALLET_CRYPTO_KEY_SIZE))
          return false;
  
      CMasterKey kMasterKey(nDerivationMethodIndex);
  
      RandAddSeedPerfmon();
      kMasterKey.vchSalt.resize(WALLET_CRYPTO_SALT_SIZE);
      if (!GetRandBytes(&kMasterKey.vchSalt[0], WALLET_CRYPTO_SALT_SIZE))
          return false;
  
      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)
          {
              pwalletdbEncryption = new CWalletDB(strWalletFile);
              if (!pwalletdbEncryption->TxnBegin())
                  return false;
              pwalletdbEncryption->WriteMasterKey(nMasterKeyMaxID, kMasterKey);
          }
  
          if (!EncryptKeys(vMasterKey))
          {
              if (fFileBacked)
                  pwalletdbEncryption->TxnAbort();
              exit(1); //We now probably have half of our keys encrypted in memory, and half not...die and let the user reload their unencrypted wallet.
          }
  
          std::set<CStealthAddress>::iterator it;
          for (it = stealthAddresses.begin(); it != stealthAddresses.end(); ++it)
          {
              if (it->scan_secret.size() < 32)
                  continue; // stealth address is not owned
              // -- CStealthAddress is only sorted on spend_pubkey
              CStealthAddress &sxAddr = const_cast<CStealthAddress&>(*it);
  
              if (fDebug)
                  printf("Encrypting stealth key %s\n", sxAddr.Encoded().c_str());
  
              std::vector<unsigned char> vchCryptedSecret;
  
              CSecret vchSecret;
              vchSecret.resize(32);
              memcpy(&vchSecret[0], &sxAddr.spend_secret[0], 32);
  
              uint256 iv = Hash(sxAddr.spend_pubkey.begin(), sxAddr.spend_pubkey.end());
              if (!EncryptSecret(vMasterKey, vchSecret, iv, vchCryptedSecret))
              {
                  printf("Error: Failed encrypting stealth key %s\n", sxAddr.Encoded().c_str());
                  continue;
              };
  
              sxAddr.spend_secret = vchCryptedSecret;
              pwalletdbEncryption->WriteStealthAddress(sxAddr);
          };
  
          // Encryption was introduced in version 0.4.0
          SetMinVersion(FEATURE_WALLETCRYPT, pwalletdbEncryption, true);
  
          if (fFileBacked)
          {
              if (!pwalletdbEncryption->TxnCommit())
                  exit(1); //We now have keys encrypted in memory, but no on disk...die to avoid confusion and let the user reload their unencrypted wallet.
  
              delete pwalletdbEncryption;
              pwalletdbEncryption = NULL;
          }
  
          Lock();
          Unlock(strWalletPassphrase);
          NewKeyPool();
          Lock();
  
          // Need to completely rewrite the wallet file; if we don't, bdb might keep
          // bits of the unencrypted private key in slack space in the database file.
          CDB::Rewrite(strWalletFile);
      }
      NotifyStatusChanged(this);
  
      return true;
  }
  
  int64_t CWallet::IncOrderPosNext(CWalletDB *pwalletdb)
  {
      AssertLockHeld(cs_wallet); // nOrderPosNext
      int64_t nRet = nOrderPosNext++;
      if (pwalletdb) {
          pwalletdb->WriteOrderPosNext(nOrderPosNext);
      } else {
          CWalletDB(strWalletFile).WriteOrderPosNext(nOrderPosNext);
      }
      return nRet;
  }
  
  void CWallet::MarkDirty()
  {
      {
          LOCK(cs_wallet);
          BOOST_FOREACH(PAIRTYPE(const uint256, CWalletTx)& item, mapWallet)
              item.second.MarkDirty();
      }
  }
  
  bool CWallet::AddToWallet(const CWalletTx& wtxIn, bool fFromLoadWallet)
  {
      uint256 hash = wtxIn.GetHash();
      if (fFromLoadWallet)
      {
          mapWallet[hash] = wtxIn;
          CWalletTx& wtx = mapWallet[hash];
          wtx.BindWallet(this);
          wtxOrdered.insert(make_pair(wtx.nOrderPos, TxPair(&wtx, (CAccountingEntry*)0)));
          AddToSpends(hash);
      }
      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();
              wtxOrdered.insert(make_pair(wtx.nOrderPos, TxPair(&wtx, (CAccountingEntry*)0)));
  
              wtx.nTimeSmart = wtx.nTimeReceived;
              if (wtxIn.hashBlock != 0)
              {
                  if (mapBlockIndex.count(wtxIn.hashBlock))
                  {
                      unsigned int latestNow = wtx.nTimeReceived;
                      unsigned int 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;
                              }
                          }
                      }
  
                      unsigned int& blocktime = mapBlockIndex[wtxIn.hashBlock]->nTime;
                      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());
              }
          }
  
          bool fUpdated = false;
          if (!fInsertedNew)
          {
              // Merge
              if (wtxIn.hashBlock != 0 && wtxIn.hashBlock != wtx.hashBlock)
              {
                  wtx.hashBlock = wtxIn.hashBlock;
                  fUpdated = true;
              }
              if (wtxIn.nIndex != -1 && (wtxIn.vMerkleBranch != wtx.vMerkleBranch || wtxIn.nIndex != wtx.nIndex))
              {
                  wtx.vMerkleBranch = wtxIn.vMerkleBranch;
                  wtx.nIndex = wtxIn.nIndex;
                  fUpdated = true;
              }
              if (wtxIn.fFromMe && wtxIn.fFromMe != wtx.fFromMe)
              {
                  wtx.fFromMe = wtxIn.fFromMe;
                  fUpdated = true;
              }
              fUpdated |= wtx.UpdateSpent(wtxIn.vfSpent);
          }
  
          //// debug print
          LogPrintf("AddToWallet %s  %s%s\n", wtxIn.GetHash().ToString(), (fInsertedNew ? "new" : ""), (fUpdated ? "update" : ""));
  
          // Write to disk
          if (fInsertedNew || fUpdated)
              if (!wtx.WriteToDisk())
                  return false;
  
          // Break debit/credit balance caches:
          wtx.MarkDirty();
  
          // Notify UI of new or updated transaction
          NotifyTransactionChanged(this, hash, fInsertedNew ? CT_NEW : CT_UPDATED);
  
          // notify an external script when a wallet transaction comes in or is updated
          std::string strCmd = GetArg("-walletnotify", "");
  
          if ( !strCmd.empty())
          {
              boost::replace_all(strCmd, "%s", wtxIn.GetHash().GetHex());
              boost::thread t(runCommand, strCmd); // thread runs free
          }
  
      }
      return true;
  }
  
  // Add a transaction to the wallet, or update it.
  // pblock is optional, but should be provided if the transaction is known to be in a block.
  // If fUpdate is true, existing transactions will be updated.
  bool CWallet::AddToWalletIfInvolvingMe(const CTransaction& tx, const CBlock* pblock, bool fUpdate)
  {
      uint256 hash = tx.GetHash();
      {
          LOCK(cs_wallet);
          bool fExisted = mapWallet.count(hash);
          if (fExisted && !fUpdate) return false;
  
          mapValue_t mapNarr;
          FindStealthTransactions(tx, mapNarr);
  
          if (fExisted || IsMine(tx) || IsFromMe(tx))
          {
              CWalletTx wtx(this,tx);
  
              if (!mapNarr.empty())
                  wtx.mapValue.insert(mapNarr.begin(), mapNarr.end());
  
              // Get merkle branch if transaction was found in a block
              if (pblock)
                  wtx.SetMerkleBranch(pblock);
  
              return AddToWallet(wtx);
          }
      }
      return false;
  }
  
  void CWallet::SyncTransaction(const CTransaction& tx, const CBlock* pblock, bool fConnect, bool fFixSpentCoins)
  {
      LOCK2(cs_main, cs_wallet);
      if (!AddToWalletIfInvolvingMe(tx, pblock, true))
          return; // Not one of ours
  
      // If a transaction changes 'conflicted' state, that changes the balance
      // available of the outputs it spends. So force those to be
      // recomputed, also:
      BOOST_FOREACH(const CTxIn& txin, tx.vin)
      {
          if (mapWallet.count(txin.prevout.hash))
              mapWallet[txin.prevout.hash].MarkDirty();
      }
  
      if (!fConnect)
      {
          // wallets need to refund inputs when disconnecting coinstake
          if (tx.IsCoinStake())
          {
              if (IsFromMe(tx))
                  DisableTransaction(tx);
          }
          return;
      }
  
      AddToWalletIfInvolvingMe(tx, pblock, true);
  
      if (fFixSpentCoins)
      {
          // Mark old coins as spent
          set<CWalletTx*> setCoins;
          BOOST_FOREACH(const CTxIn& txin, tx.vin)
          {
              CWalletTx &coin = mapWallet[txin.prevout.hash];
              coin.BindWallet(this);
              coin.MarkSpent(txin.prevout.n);
              coin.WriteToDisk();
              NotifyTransactionChanged(this, coin.GetHash(), CT_UPDATED);
          }
      }
  }
  
  void CWallet::EraseFromWallet(const uint256 &hash)
  {
      if (!fFileBacked)
          return;
      {
          LOCK(cs_wallet);
          if (mapWallet.erase(hash))
              CWalletDB(strWalletFile).EraseTx(hash);
      }
      return;
  }
  
  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;
  }
  
  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;
  }
  
  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() || IsCoinStake())
          {
              // Generated block
              if (hashBlock != 0)
              {
                  map<uint256, int>::const_iterator mi = pwallet->mapRequestCount.find(hashBlock);
                  if (mi != pwallet->mapRequestCount.end())
                      nRequests = (*mi).second;
              }
          }
          else
          {
              // Did anyone request this transaction?
              map<uint256, int>::const_iterator mi = pwallet->mapRequestCount.find(GetHash());
              if (mi != pwallet->mapRequestCount.end())
              {
                  nRequests = (*mi).second;
  
                  // How about the block it's in?
                  if (nRequests == 0 && hashBlock != 0)
                  {
                      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<pair<CTxDestination, int64_t> >& listReceived,
                             list<pair<CTxDestination, int64_t> >& listSent, CAmount& nFee, string& strSentAccount, const isminefilter& filter) const
  {
      LOCK(pwallet->cs_wallet);
      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.
      BOOST_FOREACH(const CTxOut& txout, vout)
      {
          // Skip special stake out
          if (txout.scriptPubKey.empty())
              continue;
  
          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
          // TXNOTE: CoinControl possible fix related... with HD wallet we need to report change?
              if (pwallet->IsChange(txout))
                  continue;
          }
          else if (!(fIsMine & filter))
              continue;
  
          // In either case, we need to get the destination address
          CTxDestination address;
          if (!ExtractDestination(txout.scriptPubKey, address))
          {
              LogPrintf("CWalletTx::GetAmounts: Unknown transaction type found, txid %s\n",
                       this->GetHash().ToString());
              address = CNoDestination();
          }
  
          // If we are debited by the transaction, add the output as a "sent" entry
          if (nDebit > 0)
              listSent.push_back(make_pair(address, txout.nValue));
  
          // If we are receiving the output, add it as a "received" entry
          if (fIsMine & filter)
              listReceived.push_back(make_pair(address, txout.nValue));
      }
  
  }
  
  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<pair<CTxDestination, int64_t> > listReceived;
      list<pair<CTxDestination, int64_t> > listSent;
      GetAmounts(listReceived, listSent, allFee, strSentAccount, filter);
  
      if (strAccount == strSentAccount)
      {
          BOOST_FOREACH(const PAIRTYPE(CTxDestination,int64_t)& s, listSent)
              nSent += s.second;
          nFee = allFee;
      }
      {
          LOCK(pwallet->cs_wallet);
          BOOST_FOREACH(const PAIRTYPE(CTxDestination,int64_t)& r, listReceived)
          {
              if (pwallet->mapAddressBook.count(r.first))
              {
                  map<CTxDestination, string>::const_iterator mi = pwallet->mapAddressBook.find(r.first);
                  if (mi != pwallet->mapAddressBook.end() && (*mi).second == strAccount)
                      nReceived += r.second;
              }
              else if (strAccount.empty())
              {
                  nReceived += r.second;
              }
          }
      }
  }
  
  void CWalletTx::AddSupportingTransactions(CTxDB& txdb)
  {
      vtxPrev.clear();
  
      const int COPY_DEPTH = 3;
      if (SetMerkleBranch() < COPY_DEPTH)
      {
          vector<uint256> vWorkQueue;
          BOOST_FOREACH(const CTxIn& txin, vin)
              vWorkQueue.push_back(txin.prevout.hash);
  
          // This critsect is OK because txdb is already open
          {
              LOCK(pwallet->cs_wallet);
              map<uint256, const CMerkleTx*> mapWalletPrev;
              set<uint256> setAlreadyDone;
              for (unsigned int i = 0; i < vWorkQueue.size(); i++)
              {
                  uint256 hash = vWorkQueue[i];
                  if (setAlreadyDone.count(hash))
                      continue;
                  setAlreadyDone.insert(hash);
  
                  CMerkleTx tx;
                  map<uint256, CWalletTx>::const_iterator mi = pwallet->mapWallet.find(hash);
                  if (mi != pwallet->mapWallet.end())
                  {
                      tx = (*mi).second;
                      BOOST_FOREACH(const CMerkleTx& txWalletPrev, (*mi).second.vtxPrev)
                          mapWalletPrev[txWalletPrev.GetHash()] = &txWalletPrev;
                  }
                  else if (mapWalletPrev.count(hash))
                  {
                      tx = *mapWalletPrev[hash];
                  }
                  else if (txdb.ReadDiskTx(hash, tx))
                  {
                      ;
                  }
                  else
                  {
                      LogPrintf("ERROR: AddSupportingTransactions() : unsupported transaction\n");
                      continue;
                  }
  
                  int nDepth = tx.SetMerkleBranch();
                  vtxPrev.push_back(tx);
  
                  if (nDepth < COPY_DEPTH)
                  {
                      BOOST_FOREACH(const CTxIn& txin, tx.vin)
                          vWorkQueue.push_back(txin.prevout.hash);
                  }
              }
          }
      }
  
      reverse(vtxPrev.begin(), vtxPrev.end());
  }
  
  bool CWalletTx::WriteToDisk()
  {
      return CWalletDB(pwallet->strWalletFile).WriteTx(GetHash(), *this);
  }
  
  // Scan the block chain (starting in pindexStart) for transactions
  // from or to us. If fUpdate is true, found transactions that already
  // exist in the wallet will be updated.
  int CWallet::ScanForWalletTransactions(CBlockIndex* pindexStart, bool fUpdate)
  {
      int ret = 0;
  
      CBlockIndex* pindex = pindexStart;
      {
          LOCK2(cs_main, cs_wallet);
          while (pindex)
          {
              // no need to read and scan block, if block was created before
              // our wallet birthday (as adjusted for block time variability)
              if (nTimeFirstKey && (pindex->nTime < (nTimeFirstKey - 7200))) {
                  pindex = pindex->pnext;
                  continue;
              }
  
              CBlock block;
              block.ReadFromDisk(pindex, true);
              BOOST_FOREACH(CTransaction& tx, block.vtx)
              {
                  if (AddToWalletIfInvolvingMe(tx, &block, fUpdate))
                      ret++;
              }
              pindex = pindex->pnext;
          }
      }
      return ret;
  }
  
  void CWallet::ReacceptWalletTransactions()
  {
      CTxDB txdb("r");
      bool fRepeat = true;
      while (fRepeat)
      {
          LOCK2(cs_main, cs_wallet);
          fRepeat = false;
          vector<CDiskTxPos> vMissingTx;
          BOOST_FOREACH(PAIRTYPE(const uint256, CWalletTx)& item, mapWallet)
          {
              const uint256& wtxid = item.first;
              CWalletTx& wtx = item.second;
              assert(wtx.GetHash() == wtxid);
  
              int nDepth = wtx.GetDepthInMainChain();
  
              if (!wtx.IsCoinBase() && nDepth < 0)
              {
                  // Try to add to memory pool
                  LOCK(mempool.cs);
                  wtx.AcceptToMemoryPool(false);
              }
              if ((wtx.IsCoinBase() && wtx.IsSpent(0)) || (wtx.IsCoinStake() && wtx.IsSpent(1)))
              {
                  continue;
              }
  
              CTxIndex txindex;
              bool fUpdated = false;
              if (txdb.ReadTxIndex(wtx.GetHash(), txindex))
              {
                  // Update fSpent if a tx got spent somewhere else by a copy of wallet.dat
                  if (txindex.vSpent.size() != wtx.vout.size())
                  {
                      LogPrintf("ERROR: ReacceptWalletTransactions() : txindex.vSpent.size() %u != wtx.vout.size() %u\n", txindex.vSpent.size(), wtx.vout.size());
                      continue;
                  }
                  for (unsigned int i = 0; i < txindex.vSpent.size(); i++)
                  {
                      if (wtx.IsSpent(i))
                          continue;
                      if (!txindex.vSpent[i].IsNull() && IsMine(wtx.vout[i]))
                      {
                          wtx.MarkSpent(i);
                          fUpdated = true;
                          vMissingTx.push_back(txindex.vSpent[i]);
                      }
                  }
                  if (fUpdated)
                  {
                      LogPrintf("ReacceptWalletTransactions found spent coin %s AEQL %s\n", FormatMoney(wtx.GetCredit(ISMINE_ALL)), wtx.GetHash().ToString());
                      wtx.MarkDirty();
                      wtx.WriteToDisk();
                  }
              }
              else
              {
                  // Re-accept any txes of ours that aren't already in a block
                  if (!(wtx.IsCoinBase() || wtx.IsCoinStake()))
                      wtx.AcceptWalletTransaction(txdb);
              }
          }
          if (!vMissingTx.empty())
          {
              // TODO: optimize this to scan just part of the block chain?
              if (ScanForWalletTransactions(pindexGenesisBlock))
                  fRepeat = true;  // Found missing transactions: re-do re-accept.
          }
      }
  }
  
  void CWalletTx::RelayWalletTransaction(CTxDB& txdb, std::string strCommand)
  {
      if (!(IsCoinBase() || IsCoinStake()))
      {
          if (GetDepthInMainChain() == 0) {
              uint256 hash = GetHash();
              if(strCommand == "txlreq"){
                  LogPrintf("Relaying txlreq %s\n", hash.ToString());
                  mapTxLockReq.insert(make_pair(hash, ((CTransaction)*this)));
                  CreateNewLock(((CTransaction)*this));
                  RelayTransactionLockReq((CTransaction)*this, true);
              } else {
                  LogPrintf("Relaying wtx %s\n", hash.ToString());
                  RelayTransaction((CTransaction)*this, hash);
              }
          }
      }
  }
  
  void CWalletTx::RelayWalletTransaction(std::string strCommand)
  {
     CTxDB txdb("r");
     RelayWalletTransaction(txdb, strCommand);
  }
  
  set<uint256> CWalletTx::GetConflicts() const
  {
      set<uint256> result;
      if (pwallet != NULL)
      {
          uint256 myHash = GetHash();
          result = pwallet->GetConflicts(myHash);
          result.erase(myHash);
      }
      return result;
  }
  
  void CWallet::ResendWalletTransactions(bool fForce)
  {
      if (!fForce)
      {
          // Do this infrequently and randomly to avoid giving away
          // that these are our transactions.
          static int64_t nNextTime;
          if (GetTime() < nNextTime)
              return;
          bool fFirst = (nNextTime == 0);
          nNextTime = GetTime() + GetRand(30 * 60);
          if (fFirst)
              return;
  
          // Only do it if there's been a new block since last time
          static int64_t nLastTime;
          if (nTimeBestReceived < nLastTime)
              return;
          nLastTime = GetTime();
      }
  
      // Rebroadcast any of our txes that aren't in a block yet
      LogPrintf("ResendWalletTransactions()\n");
      CTxDB txdb("r");
      {
          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 until it's had plenty of time that
              // it should have gotten in already by now.
              if (fForce || nTimeBestReceived - (int64_t)wtx.nTimeReceived > 5 * 60)
                  mapSorted.insert(make_pair(wtx.nTimeReceived, &wtx));
          }
          BOOST_FOREACH(PAIRTYPE(const unsigned int, CWalletTx*)& item, mapSorted)
          {
              CWalletTx& wtx = *item.second;
              wtx.RelayWalletTransaction(txdb);
          }
      }
  }
  
  
  
  
  
  
  
  //////////////////////////////////////////////////////////////////////////////
  //
  // 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;
  }
  
  // ppcoin: total coins staked (non-spendable until maturity)
  CAmount CWallet::GetStake() 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->IsCoinStake() && pcoin->GetBlocksToMaturity() > 0 && pcoin->GetDepthInMainChain() > 0)
              nTotal += CWallet::GetCredit(*pcoin, ISMINE_ALL);
      }
      return nTotal;
  }
  
  CAmount CWallet::GetNewMint() 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->IsCoinBase() && pcoin->GetBlocksToMaturity() > 0 && pcoin->GetDepthInMainChain() > 0)
              nTotal += CWallet::GetCredit(*pcoin, ISMINE_ALL);
      }
      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 (!IsFinalTx(*pcoin) || (!pcoin->IsTrusted() && pcoin->GetDepthInMainChain() == 0))
                  nTotal += pcoin->GetAvailableCredit();
          }
      }
      return nTotal;
  }
  
  CAmount CWallet::GetImmatureBalance() const
  {
      CAmount nTotal = 0;
      {
          LOCK2(cs_main, cs_wallet);
          for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
          {
              const CWalletTx* pcoin = &(*it).second;
              nTotal += pcoin->GetImmatureCredit();
          }
      }
      return nTotal;
  }
  
  CAmount CWallet::GetWatchOnlyBalance() const
  {
      CAmount nTotal = 0;
      {
          LOCK2(cs_main, cs_wallet);
          for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
          {
              const CWalletTx* pcoin = &(*it).second;
              if (pcoin->IsTrusted())
                  nTotal += pcoin->GetAvailableWatchOnlyCredit();
          }
      }
  
      return nTotal;
  }
  
  CAmount CWallet::GetWatchOnlyStake() 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->IsCoinStake() && pcoin->GetBlocksToMaturity() > 0 && pcoin->GetDepthInMainChain() > 0)
              nTotal += CWallet::GetCredit(*pcoin, ISMINE_WATCH_ONLY);
      }
      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 (!IsFinalTx(*pcoin) || (!pcoin->IsTrusted() && pcoin->GetDepthInMainChain() == 0))
                  nTotal += pcoin->GetAvailableWatchOnlyCredit();
          }
      }
      return nTotal;
  }
  
  CAmount CWallet::GetImmatureWatchOnlyBalance() const
  {
      CAmount nTotal = 0;
      {
          LOCK2(cs_main, cs_wallet);
          for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
          {
              const CWalletTx* pcoin = &(*it).second;
              nTotal += pcoin->GetImmatureWatchOnlyCredit();
          }
      }
      return nTotal;
  }
  
  // populate vCoins with vector of available COutputs.
  void CWallet::AvailableCoins(vector<COutput>& vCoins, bool fOnlyConfirmed, const CCoinControl *coinControl, AvailableCoinsType coin_type, bool useIX) const
  {
      vCoins.clear();
  
      {
          LOCK2(cs_main, cs_wallet);
          for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
          {
              const CWalletTx* pcoin = &(*it).second;
  
              if (!IsFinalTx(*pcoin))
                  continue;
  
              if (fOnlyConfirmed && !pcoin->IsTrusted())
                  continue;
  
              if (pcoin->IsCoinBase() && pcoin->GetBlocksToMaturity() > 0)
                  continue;
  
              if(pcoin->IsCoinStake() && pcoin->GetBlocksToMaturity() > 0)
                  continue;
  
              int nDepth = pcoin->GetDepthInMainChain(false);
              if (nDepth <= 0) // NOTE: coincontrol fix / ignore 0 confirm
                  continue;
  
              // do not use IX for inputs that have less then 6 blockchain confirmations
              if (useIX && nDepth < 10)
                  continue;
  
              for (unsigned int i = 0; i < pcoin->vout.size(); i++) {
                  bool found = false;
                  if(coin_type == ONLY_NOT10000IFMN) {
                      found = !(fMasterNode && pcoin->vout[i].nValue == MasternodeCollateral(pindexBest->nHeight)*COIN);
                  } else if (coin_type == ONLY_NONDENOMINATED_NOT10000IFMN){
                      if (IsCollateralAmount(pcoin->vout[i].nValue)) continue; // do not use collateral amounts
                      if(fMasterNode) found = pcoin->vout[i].nValue != MasternodeCollateral(pindexBest->nHeight)*COIN; // do not use Hot MN funds
                  } else {
                      found = true;
                  }
                  if(!found) continue;
  
                  isminetype mine = IsMine(pcoin->vout[i]);
                  if (!(pcoin->IsSpent(i)) && mine != ISMINE_NO &&
                      !IsLockedCoin((*it).first, i) && pcoin->vout[i].nValue > 0 &&
                      (!coinControl || !coinControl->HasSelected() || coinControl->IsSelected((*it).first, i)))
                  {
                      vCoins.push_back(COutput(pcoin, i, nDepth, mine & ISMINE_SPENDABLE));
                  }
              }
          }
      }
  }
  
  void CWallet::AvailableCoinsMN(vector<COutput>& vCoins, bool fOnlyConfirmed, const CCoinControl *coinControl, AvailableCoinsType coin_type, bool useIX) const
  {
      vCoins.clear();
  
      {
          LOCK2(cs_main, cs_wallet);
          for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
          {
              const CWalletTx* pcoin = &(*it).second;
  
              if (!IsFinalTx(*pcoin))
                  continue;
  
              if (fOnlyConfirmed && !pcoin->IsTrusted())
                  continue;
  
              if (pcoin->IsCoinBase() && pcoin->GetBlocksToMaturity() > 0)
                  continue;
  
              if(pcoin->IsCoinStake() && pcoin->GetBlocksToMaturity() > 0)
                  continue;
  
              int nDepth = pcoin->GetDepthInMainChain();
              if (nDepth <= 0) // NOTE: coincontrol fix / ignore 0 confirm
                  continue;
  
              // do not use IX for inputs that have less then 6 blockchain confirmations
              if (useIX && nDepth < 10)
                  continue;
  
              for (unsigned int i = 0; i < pcoin->vout.size(); i++) {
                  bool found = false;
                  if(coin_type == ONLY_NOT10000IFMN) {
                      found = !(fMasterNode && pcoin->vout[i].nValue == MasternodeCollateral(pindexBest->nHeight)*COIN);
                  } else if (coin_type == ONLY_NONDENOMINATED_NOT10000IFMN){
                      if (IsCollateralAmount(pcoin->vout[i].nValue)) continue; // do not use collateral amounts
                      if(fMasterNode) found = pcoin->vout[i].nValue != MasternodeCollateral(pindexBest->nHeight)*COIN; // do not use Hot MN funds
                  } else {
                      found = true;
                  }
                  if(!found) continue;
  
                  isminetype mine = IsMine(pcoin->vout[i]);
  
                  if (!(pcoin->IsSpent(i)) && mine != ISMINE_NO &&
                      !IsLockedCoin((*it).first, i) && pcoin->vout[i].nValue > 0 &&
                      (!coinControl || !coinControl->HasSelected() || coinControl->IsSelected((*it).first, i)))
                          vCoins.push_back(COutput(pcoin, i, nDepth, (mine & ISMINE_SPENDABLE) != ISMINE_NO));
              }
          }
      }
  }
  
  void CWallet::AvailableCoinsForStaking(vector<COutput>& vCoins, unsigned int nSpendTime) const
  {
      vCoins.clear();
  
      {
          LOCK2(cs_main, cs_wallet);
          for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
          {
              const CWalletTx* pcoin = &(*it).second;
  
              int nDepth = pcoin->GetDepthInMainChain();
              if (nDepth < 1)
                  continue;
  
              if (nDepth < nStakeMinConfirmations)
                  continue;
  
              if (pcoin->GetBlocksToMaturity() > 0)
                  continue;
  
              bool found = false;
              for (unsigned int i = 0; i < pcoin->vout.size(); i++){
                  if (pcoin->vout[i].nValue == MasternodeCollateral(pindexBest->nHeight)*COIN){
  
                      //LogPrintf("CWallet::AvailableCoinsForStaking - Found Masternode collateral.\n");
                      found = true;
                      break;
                  }
                  if (IsCollateralAmount(pcoin->vout[i].nValue)){
  
                      //LogPrintf("CWallet::AvailableCoinsForStaking - Found Collateral amount.\n");
                      found = true;
                      break;
                  }
              }
  
              if(found) continue;
  
              for (unsigned int i = 0; i < pcoin->vout.size(); i++) {
                  isminetype mine = IsMine(pcoin->vout[i]);
                  if (!(pcoin->IsSpent(i)) && mine != ISMINE_NO && pcoin->vout[i].nValue >= nMinimumInputValue)
                      vCoins.push_back(COutput(pcoin, i, nDepth, mine & ISMINE_SPENDABLE));
              }
          }
      }
  }
  
  static void ApproximateBestSubset(vector<pair<int64_t, pair<const CWalletTx*,unsigned int> > >vValue, int64_t nTotalLower, int64_t nTargetValue,
                                    vector<char>& vfBest, int64_t& 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);
          int64_t 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 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(int64_t nTargetValue, unsigned int nSpendTime, int nConfMine, int nConfTheirs, vector<COutput> vCoins, set<pair<const CWalletTx*,unsigned int> >& setCoinsRet, int64_t& nValueRet) const
  {
      setCoinsRet.clear();
      nValueRet = 0;
  
      // List of values less than target
      pair<int64_t, pair<const CWalletTx*,unsigned int> > coinLowestLarger;
      coinLowestLarger.first = std::numeric_limits<int64_t>::max();
      coinLowestLarger.second.first = NULL;
      vector<pair<int64_t, pair<const CWalletTx*,unsigned int> > > vValue;
      int64_t nTotalLower = 0;
  
      random_shuffle(vCoins.begin(), vCoins.end(), GetRandInt);
  
      BOOST_FOREACH(const COutput &output, vCoins)
      {
          if (!output.fSpendable)
              continue;
  
          const CWalletTx *pcoin = output.tx;
  
          if (output.nDepth < (pcoin->IsFromMe(ISMINE_ALL) ? nConfMine : nConfTheirs))
              continue;
  
          int i = output.i;
  
          // Follow the timestamp rules
          if (pcoin->nTime > nSpendTime)
              continue;
  
          int64_t n = pcoin->vout[i].nValue;
  
          pair<int64_t,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 + CENT)
          {
              vValue.push_back(coin);
              nTotalLower += n;
          }
          else if (n < coinLowestLarger.first)
          {
              coinLowestLarger = coin;
          }
      }
  
      if (nTotalLower == nTargetValue)
      {
          for (unsigned int i = 0; i < vValue.size(); ++i)
          {
              setCoinsRet.insert(vValue[i].second);
              nValueRet += vValue[i].first;
          }
          return true;
      }
  
      if (nTotalLower < nTargetValue)
      {
          if (coinLowestLarger.second.first == NULL)
              return false;
          setCoinsRet.insert(coinLowestLarger.second);
          nValueRet += coinLowestLarger.first;
          return true;
      }
  
      // Solve subset sum by stochastic approximation
      sort(vValue.rbegin(), vValue.rend(), CompareValueOnly());
      vector<char> vfBest;
      int64_t nBest;
  
      ApproximateBestSubset(vValue, nTotalLower, nTargetValue, vfBest, nBest, 1000);
      if (nBest != nTargetValue && nTotalLower >= nTargetValue + CENT)
          ApproximateBestSubset(vValue, nTotalLower, nTargetValue + CENT, vfBest, nBest, 1000);
  
      // 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 + CENT) || 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(int64_t nTargetValue, unsigned int nSpendTime, set<pair<const CWalletTx*,unsigned int> >& setCoinsRet, int64_t& nValueRet, const CCoinControl* coinControl, AvailableCoinsType coin_type, bool useIX) const
  {
      vector<COutput> vCoins;
      AvailableCoins(vCoins, true, coinControl, coin_type, useIX);
  
      // coin control -> return all selected outputs (we want all selected to go into the transaction for sure)
      if (coinControl && coinControl->HasSelected())
      {
          BOOST_FOREACH(const COutput& out, vCoins)
          {
              if(!out.fSpendable)
                  continue;
  
              nValueRet += out.tx->vout[out.i].nValue;
              setCoinsRet.insert(make_pair(out.tx, out.i));
          }
          return (nValueRet >= nTargetValue);
      }
  
      boost::function<bool (const CWallet*, int64_t, unsigned int, int, int, std::vector<COutput>, std::set<std::pair<const CWalletTx*,unsigned int> >&, int64_t&)> f = &CWallet::SelectCoinsMinConf;
  
      return (f(this, nTargetValue, nSpendTime, 1, 10, vCoins, setCoinsRet, nValueRet) ||
              f(this, nTargetValue, nSpendTime, 1, 1, vCoins, setCoinsRet, nValueRet) ||
              f(this, nTargetValue, nSpendTime, 0, 1, vCoins, setCoinsRet, nValueRet));
  }
  
  // Select some coins without random shuffle or best subset approximation
  bool CWallet::SelectCoinsForStaking(int64_t nTargetValue, unsigned int nSpendTime, set<pair<const CWalletTx*,unsigned int> >& setCoinsRet, int64_t& nValueRet) const
  {
      vector<COutput> vCoins;
      AvailableCoinsForStaking(vCoins, nSpendTime);
  
      setCoinsRet.clear();
      nValueRet = 0;
  
      BOOST_FOREACH(COutput output, vCoins)
      {
          if(!output.fSpendable)
              continue;
  
          const CWalletTx *pcoin = output.tx;
          int i = output.i;
  
          // Stop if we've chosen enough inputs
          if (nValueRet >= nTargetValue)
              break;
  
          int64_t n = pcoin->vout[i].nValue;
  
          pair<int64_t,pair<const CWalletTx*,unsigned int> > coin = make_pair(n,make_pair(pcoin, i));
  
          if (n >= nTargetValue)
          {
              // If input value is greater or equal to target then simply insert
              //    it into the current subset and exit
              setCoinsRet.insert(coin.second);
              nValueRet += coin.first;
              break;
          }
          else if (n < nTargetValue + CENT)
          {
              setCoinsRet.insert(coin.second);
              nValueRet += coin.first;
          }
      }
  
      return true;
  }
  
  struct CompareByPriority
  {
      bool operator()(const COutput& t1,
                      const COutput& t2) const
      {
          return t1.Priority() > t2.Priority();
      }
  };
  
  bool CWallet::SelectCoinsCollateral(std::vector<CTxIn>& setCoinsRet, int64_t& nValueRet) const
  {
      vector<COutput> vCoins;
  
      //printf(" selecting coins for collateral\n");
      AvailableCoins(vCoins);
  
      //printf("found coins %d\n", (int)vCoins.size());
  
      set<pair<const CWalletTx*,unsigned int> > setCoinsRet2;
  
      BOOST_FOREACH(const COutput& out, vCoins)
      {
          // collateral inputs will always be a multiple of DARSEND_COLLATERAL, up to five
          if(IsCollateralAmount(out.tx->vout[out.i].nValue))
          {
              CTxIn vin = CTxIn(out.tx->GetHash(),out.i);
  
              vin.prevPubKey = out.tx->vout[out.i].scriptPubKey; // the inputs PubKey
              nValueRet += out.tx->vout[out.i].nValue;
              setCoinsRet.push_back(vin);
              setCoinsRet2.insert(make_pair(out.tx, out.i));
              return true;
          }
      }
  
      return false;
  }
  
  int CWallet::CountInputsWithAmount(int64_t nInputAmount)
  {
      int64_t nTotal = 0;
      {
          LOCK(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++) {
                      bool mine = IsMine(pcoin->vout[i]);
                      COutput out = COutput(pcoin, i, nDepth, mine);
                      CTxIn vin = CTxIn(out.tx->GetHash(), out.i);
  
                      if(out.tx->vout[out.i].nValue != nInputAmount) continue;
  
                      if(pcoin->IsSpent(i) || !IsMine(pcoin->vout[i])) continue;
  
                      nTotal++;
                  }
              }
          }
      }
  
      return nTotal;
  }
  
  bool CWallet::HasCollateralInputs(bool fOnlyConfirmed) const
  {
      vector<COutput> vCoins;
      AvailableCoins(vCoins, fOnlyConfirmed);
  
      int nFound = 0;
      BOOST_FOREACH(const COutput& out, vCoins)
          if(IsCollateralAmount(out.tx->vout[out.i].nValue)) nFound++;
  
      return nFound > 0;
  }
  
  bool CWallet::IsCollateralAmount(int64_t nInputAmount) const
  {
      return  nInputAmount != 0 && nInputAmount % MNengine_COLLATERAL == 0 && nInputAmount < MNengine_COLLATERAL * 5  && nInputAmount > MNengine_COLLATERAL;
  }
  
  bool CWallet::CreateCollateralTransaction(CTransaction& txCollateral, std::string& strReason)
  {
      /*
          To doublespend a collateral transaction, it will require a fee higher than this. So there's
          still a significant cost.
      */
      CAmount nFeeRet = 0.001*COIN;
  
      txCollateral.vin.clear();
      txCollateral.vout.clear();
      txCollateral.nTime = GetAdjustedTime();
  
      CReserveKey reservekey(this);
      CAmount nValueIn2 = 0;
      std::vector<CTxIn> vCoinsCollateral;
  
      if (!SelectCoinsCollateral(vCoinsCollateral, nValueIn2))
      {
          strReason = "Error: MNengine 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();
  
      BOOST_FOREACH(CTxIn v, vCoinsCollateral)
          txCollateral.vin.push_back(v);
  
      if(nValueIn2 - MNengine_COLLATERAL - nFeeRet > 0) {
          //pay collateral charge in fees
          CTxOut vout3 = CTxOut(nValueIn2 - MNengine_COLLATERAL, scriptChange);
          txCollateral.vout.push_back(vout3);
      }
  
      int vinNumber = 0;
      BOOST_FOREACH(CTxIn v, txCollateral.vin) {
          if(!SignSignature(*this, v.prevPubKey, txCollateral, vinNumber, int(SIGHASH_ALL|SIGHASH_ANYONECANPAY))) {
              BOOST_FOREACH(CTxIn v, vCoinsCollateral)
                  UnlockCoin(v.prevout);
  
              strReason = "CMNenginePool::Sign - Unable to sign collateral transaction! \n";
              return false;
          }
          vinNumber++;
      }
  
      return true;
  }
  
  bool CWallet::ConvertList(std::vector<CTxIn> vCoins, std::vector<int64_t>& vecAmounts)
  {
      BOOST_FOREACH(CTxIn i, vCoins){
          if (mapWallet.count(i.prevout.hash))
          {
              CWalletTx& wtx = mapWallet[i.prevout.hash];
              if(i.prevout.n < wtx.vout.size()){
                  vecAmounts.push_back(wtx.vout[i.prevout.n].nValue);
              }
          } else {
              LogPrintf("ConvertList -- Couldn't find transaction\n");
          }
      }
      return true;
  }
  
  bool CWallet::GetStakeWeightFromValue(const int64_t& nTime, const int64_t& nValue, uint64_t& nWeight)
  {
          //This is a negative value when there is no weight. But set it to zero
          //so the user is not confused. Used in reporting in Coin Control.
          // Descisions based on this function should be used with care.
          int64_t nTimeWeight = GetWeight(nTime, (int64_t)GetTime());
          if (nTimeWeight < 0 )
                  nTimeWeight=0;
  
          CBigNum bnCoinDayWeight = CBigNum(nValue) * nTimeWeight / COIN / (24 * 60 * 60);
          nWeight = bnCoinDayWeight.getuint64();
          return true;
  }
  
  bool CWallet::CreateTransaction(const vector<pair<CScript, int64_t> >& vecSend, CWalletTx& wtxNew, CReserveKey& reservekey,
                                  int64_t& nFeeRet, int32_t& nChangePos, std::string& strFailReason, const CCoinControl* coinControl,
                                  AvailableCoinsType coin_type, bool useIX)
  {
  
      int64_t nValue = 0;
  
      BOOST_FOREACH (const PAIRTYPE(CScript, int64_t)& s, vecSend)
      {
          if (nValue < 0)
          {
              strFailReason = _("Transaction amounts must be positive");
              return false;
          }
          nValue += s.second;
      }
      if (vecSend.empty() || nValue < 0)
      {
          strFailReason = _("Transaction amounts must be positive");
          return false;
      }
  
      wtxNew.fTimeReceivedIsTxTime = true;
      wtxNew.BindWallet(this);
  
      {
          // txdb must be opened before the mapWallet lock
          CTxDB txdb("r");
          LOCK2(cs_main, cs_wallet);
          {
              nFeeRet = nTransactionFee;
              if(useIX) nFeeRet = max(CENT, nFeeRet);
              while (true)
              {
                  wtxNew.vin.clear();
                  wtxNew.vout.clear();
                  wtxNew.fFromMe = true;
  
                  int64_t nTotalValue = nValue + nFeeRet;
                  double dPriority = 0;
                  // vouts to the payees
                  BOOST_FOREACH (const PAIRTYPE(CScript, int64_t)& s, vecSend)
                  {
                      CTxOut txout(s.second, s.first);
                      bool fOpReturn = false;
  
                      if(txout.IsNull() || (!txout.IsEmpty() && txout.nValue == 0))
                      {
                          txnouttype whichType;
                          vector<valtype> vSolutions;
                          if (!Solver(txout.scriptPubKey, whichType, vSolutions))
                          {
                              strFailReason = _("Invalid scriptPubKey");
                              return false;
                          }
                          if(whichType == TX_NONSTANDARD)
                          {
                              strFailReason = _("Unknown transaction type");
                              return false;
                          }
                          if(whichType == TX_NULL_DATA)
                              fOpReturn = true;
                      }
  
                      if (!fOpReturn && txout.IsDust(MIN_RELAY_TX_FEE))
                      {
                          strFailReason = _("Transaction amount too small");
                          return false;
                      }
                      wtxNew.vout.push_back(txout);
                  }
  
                  // Choose coins to use
                  set<pair<const CWalletTx*,unsigned int> > setCoins;
                  int64_t nValueIn = 0;
  
                  if (!SelectCoins(nTotalValue, wtxNew.nTime, setCoins, nValueIn, coinControl, coin_type, useIX))
                  {
                      if(coin_type == ALL_COINS) {
                          strFailReason = _(" Insufficient funds.");
                      } else if (coin_type == ONLY_NOT10000IFMN) {
                          strFailReason = _(" Unable to locate enough MNengine non-denominated funds for this transaction.");
                      } else if (coin_type == ONLY_NONDENOMINATED_NOT10000IFMN ) {
                          strFailReason = _(" Unable to locate enough MNengine non-denominated funds for this transaction that are not equal 1000 AEQL.");
                      }
  
                      if(useIX){
                          strFailReason += _(" InstantX requires inputs with at least 10 confirmations, you might need to wait a few minutes and try again.");
                      }
                      return false;
                  }
                  BOOST_FOREACH(PAIRTYPE(const CWalletTx*, unsigned int) pcoin, setCoins)
                  {
                      int64_t 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();
                      if (age != 0)
                          age += 1;
                      dPriority += (double)nCredit * age;
                  }
  
                  int64_t nChange = nValueIn - nValue - nFeeRet;
  
                  if (nChange > 0)
                  {
                      // Fill a vout to ourself
                      // TODO: pass in scriptChange instead of reservekey so
                      // change transaction isn't always pay-to-Aequitas-Coin-address
                      CScript scriptChange;
  
                      // coin control: send change to custom address
                      if (coinControl && !boost::get<CNoDestination>(&coinControl->destChange))
                          scriptChange.SetDestination(coinControl->destChange);
  
                      // no coin control: send change to newly generated address
                      else
                      {
                          // Note: We use a new key here to keep it from being obvious which side is the change.
                          //  The drawback is that by not reusing a previous key, the change may be lost if a
                          //  backup is restored, if the backup doesn't have the new private key for the change.
                          //  If we reused the old key, it would be possible to add code to look for and
                          //  rediscover unknown transactions that were written with keys of ours to recover
                          //  post-backup change.
  
                          // Reserve a new key pair from key pool
                          CPubKey vchPubKey;
                          bool ret;
                          ret = reservekey.GetReservedKey(vchPubKey);
                          assert(ret); // should never fail, as we just unlocked
  
                          scriptChange.SetDestination(vchPubKey.GetID());
                      }
  
                      CTxOut newTxOut(nChange, scriptChange);
  
                      // Never create dust outputs; if we would, just
                      // add the dust to the fee.
                      if (newTxOut.IsDust(MIN_RELAY_TX_FEE))
                      {
                          nFeeRet += nChange;
                          nChange = 0;
                          reservekey.ReturnKey();
                      }
                      else
                      {
                          // Insert change txn at random position:
                          vector<CTxOut>::iterator position = wtxNew.vout.begin()+GetRandInt(wtxNew.vout.size()+1);
                          wtxNew.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)
                      wtxNew.vin.push_back(CTxIn(coin.first->GetHash(),coin.second));
  
                  // Sign
                  int nIn = 0;
                  BOOST_FOREACH(const PAIRTYPE(const CWalletTx*,unsigned int)& coin, setCoins)
                      if (!SignSignature(*this, *coin.first, wtxNew, nIn++))
                      {
                          strFailReason = _(" Signing transaction failed");
                          return false;
                      }
  
                  // Limit size
                  unsigned int nBytes = ::GetSerializeSize(*(CTransaction*)&wtxNew, SER_NETWORK, PROTOCOL_VERSION);
                  if (nBytes >= MAX_STANDARD_TX_SIZE)
                  {
                      strFailReason = _(" Transaction too large");
                      return false;
                  }
                  dPriority = wtxNew.ComputePriority(dPriority, nBytes);
  
                  // Check that enough fee is included
                  int64_t nPayFee = nTransactionFee * (1 + (int64_t)nBytes / 1000);
                  bool fAllowFree = AllowFree(dPriority);
                  int64_t nMinFee = GetMinFee(wtxNew, nBytes, fAllowFree, GMF_SEND);
  
                  if (nFeeRet < max(nPayFee, nMinFee))
                  {
                      nFeeRet = max(nPayFee, nMinFee);
                      if(useIX) nFeeRet = max(CENT, nFeeRet);
                      continue;
                  }
                  // Fill vtxPrev by copying from previous transactions vtxPrev
                  wtxNew.AddSupportingTransactions(txdb);
                  wtxNew.fTimeReceivedIsTxTime = true;
  
                  break;
              }
          }
      }
      return true;
  }
  
  bool CWallet::CreateTransaction(CScript scriptPubKey, int64_t nValue, std::string& sNarr, CWalletTx& wtxNew, CReserveKey& reservekey, int64_t& nFeeRet, const CCoinControl* coinControl)
  {
      vector< pair<CScript, int64_t> > vecSend;
      vecSend.push_back(make_pair(scriptPubKey, nValue));
  
      if (sNarr.length() > 0)
      {
          std::vector<uint8_t> vNarr(sNarr.c_str(), sNarr.c_str() + sNarr.length());
          std::vector<uint8_t> vNDesc;
  
          vNDesc.resize(2);
          vNDesc[0] = 'n';
          vNDesc[1] = 'p';
  
          CScript scriptN = CScript() << OP_RETURN << vNDesc << OP_RETURN << vNarr;
  
          vecSend.push_back(make_pair(scriptN, 0));
      }
  
      // -- CreateTransaction won't place change between value and narr output.
      //    narration output will be for preceding output
  
      int nChangePos;
      std::string strFailReason;
      bool rv = CreateTransaction(vecSend, wtxNew, reservekey, nFeeRet, nChangePos, strFailReason, coinControl);
      if(!strFailReason.empty())
      {
          LogPrintf("CreateTransaction(): ERROR: %s\n", strFailReason);
          return false;
      }
      // -- narration will be added to mapValue later in FindStealthTransactions From CommitTransaction
      return rv;
  }
  
  
  bool CWallet::NewStealthAddress(std::string& sError, std::string& sLabel, CStealthAddress& sxAddr)
  {
      ec_secret scan_secret;
      ec_secret spend_secret;
  
      if (GenerateRandomSecret(scan_secret) != 0
          || GenerateRandomSecret(spend_secret) != 0)
      {
          sError = "GenerateRandomSecret failed.";
          printf("Error CWallet::NewStealthAddress - %s\n", sError.c_str());
          return false;
      };
  
      ec_point scan_pubkey, spend_pubkey;
      if (SecretToPublicKey(scan_secret, scan_pubkey) != 0)
      {
          sError = "Could not get scan public key.";
          printf("Error CWallet::NewStealthAddress - %s\n", sError.c_str());
          return false;
      };
  
      if (SecretToPublicKey(spend_secret, spend_pubkey) != 0)
      {
          sError = "Could not get spend public key.";
          printf("Error CWallet::NewStealthAddress - %s\n", sError.c_str());
          return false;
      };
  
      if (fDebug)
      {
          printf("getnewstealthaddress: ");
          printf("scan_pubkey ");
          for (uint32_t i = 0; i < scan_pubkey.size(); ++i)
            printf("%02x", scan_pubkey[i]);
          printf("\n");
  
          printf("spend_pubkey ");
          for (uint32_t i = 0; i < spend_pubkey.size(); ++i)
            printf("%02x", spend_pubkey[i]);
          printf("\n");
      };
  
  
      sxAddr.label = sLabel;
      sxAddr.scan_pubkey = scan_pubkey;
      sxAddr.spend_pubkey = spend_pubkey;
  
      sxAddr.scan_secret.resize(32);
      memcpy(&sxAddr.scan_secret[0], &scan_secret.e[0], 32);
      sxAddr.spend_secret.resize(32);
      memcpy(&sxAddr.spend_secret[0], &spend_secret.e[0], 32);
  
      return true;
  }
  
  bool CWallet::AddStealthAddress(CStealthAddress& sxAddr)
  {
      LOCK(cs_wallet);
  
      // must add before changing spend_secret
      stealthAddresses.insert(sxAddr);
  
      bool fOwned = sxAddr.scan_secret.size() == ec_secret_size;
  
  
  
      if (fOwned)
      {
          // -- owned addresses can only be added when wallet is unlocked
          if (IsLocked())
          {
              printf("Error: CWallet::AddStealthAddress wallet must be unlocked.\n");
              stealthAddresses.erase(sxAddr);
              return false;
          };
  
          if (IsCrypted())
          {
              std::vector<unsigned char> vchCryptedSecret;
              CSecret vchSecret;
              vchSecret.resize(32);
              memcpy(&vchSecret[0], &sxAddr.spend_secret[0], 32);
  
              uint256 iv = Hash(sxAddr.spend_pubkey.begin(), sxAddr.spend_pubkey.end());
              if (!EncryptSecret(vMasterKey, vchSecret, iv, vchCryptedSecret))
              {
                  printf("Error: Failed encrypting stealth key %s\n", sxAddr.Encoded().c_str());
                  stealthAddresses.erase(sxAddr);
                  return false;
              };
              sxAddr.spend_secret = vchCryptedSecret;
          };
      };
  
  
      bool rv = CWalletDB(strWalletFile).WriteStealthAddress(sxAddr);
  
      if (rv)
          NotifyAddressBookChanged(this, sxAddr, sxAddr.label, fOwned, CT_NEW);
  
      return rv;
  }
  
  bool CWallet::UnlockStealthAddresses(const CKeyingMaterial& vMasterKeyIn)
  {
      // -- decrypt spend_secret of stealth addresses
      std::set<CStealthAddress>::iterator it;
      for (it = stealthAddresses.begin(); it != stealthAddresses.end(); ++it)
      {
          if (it->scan_secret.size() < 32)
              continue; // stealth address is not owned
  
          // -- CStealthAddress are only sorted on spend_pubkey
          CStealthAddress &sxAddr = const_cast<CStealthAddress&>(*it);
  
          if (fDebug)
              printf("Decrypting stealth key %s\n", sxAddr.Encoded().c_str());
  
          CSecret vchSecret;
          uint256 iv = Hash(sxAddr.spend_pubkey.begin(), sxAddr.spend_pubkey.end());
          if(!DecryptSecret(vMasterKeyIn, sxAddr.spend_secret, iv, vchSecret)
              || vchSecret.size() != 32)
          {
              printf("Error: Failed decrypting stealth key %s\n", sxAddr.Encoded().c_str());
              continue;
          };
  
          ec_secret testSecret;
          memcpy(&testSecret.e[0], &vchSecret[0], 32);
          ec_point pkSpendTest;
  
          if (SecretToPublicKey(testSecret, pkSpendTest) != 0
              || pkSpendTest != sxAddr.spend_pubkey)
          {
              printf("Error: Failed decrypting stealth key, public key mismatch %s\n", sxAddr.Encoded().c_str());
              continue;
          };
  
          sxAddr.spend_secret.resize(32);
          memcpy(&sxAddr.spend_secret[0], &vchSecret[0], 32);
      };
  
      CryptedKeyMap::iterator mi = mapCryptedKeys.begin();
      for (; mi != mapCryptedKeys.end(); ++mi)
      {
          CPubKey &pubKey = (*mi).second.first;
          std::vector<unsigned char> &vchCryptedSecret = (*mi).second.second;
          if (vchCryptedSecret.size() != 0)
              continue;
  
          CKeyID ckid = pubKey.GetID();
          CAequitasCoinAddress addr(ckid);
  
          StealthKeyMetaMap::iterator mi = mapStealthKeyMeta.find(ckid);
          if (mi == mapStealthKeyMeta.end())
          {
              printf("Error: No metadata found to add secret for %s\n", addr.ToString().c_str());
              continue;
          };
  
          CStealthKeyMetadata& sxKeyMeta = mi->second;
  
          CStealthAddress sxFind;
          sxFind.scan_pubkey = sxKeyMeta.pkScan.Raw();
  
          std::set<CStealthAddress>::iterator si = stealthAddresses.find(sxFind);
          if (si == stealthAddresses.end())
          {
              printf("No stealth key found to add secret for %s\n", addr.ToString().c_str());
              continue;
          };
  
          if (fDebug)
              printf("Expanding secret for %s\n", addr.ToString().c_str());
  
          ec_secret sSpendR;
          ec_secret sSpend;
          ec_secret sScan;
  
          if (si->spend_secret.size() != ec_secret_size
              || si->scan_secret.size() != ec_secret_size)
          {
              printf("Stealth address has no secret key for %s\n", addr.ToString().c_str());
              continue;
          }
          memcpy(&sScan.e[0], &si->scan_secret[0], ec_secret_size);
          memcpy(&sSpend.e[0], &si->spend_secret[0], ec_secret_size);
  
          ec_point pkEphem = sxKeyMeta.pkEphem.Raw();
          if (StealthSecretSpend(sScan, pkEphem, sSpend, sSpendR) != 0)
          {
              printf("StealthSecretSpend() failed.\n");
              continue;
          };
  
          ec_point pkTestSpendR;
          if (SecretToPublicKey(sSpendR, pkTestSpendR) != 0)
          {
              printf("SecretToPublicKey() failed.\n");
              continue;
          };
  
          CSecret vchSecret;
          vchSecret.resize(ec_secret_size);
  
          memcpy(&vchSecret[0], &sSpendR.e[0], ec_secret_size);
          CKey ckey;
  
          try {
          ckey.Set(vchSecret.begin(), vchSecret.end(), true);
              //ckey.SetSecret(vchSecret, true);
          } catch (std::exception& e) {
              printf("ckey.SetSecret() threw: %s.\n", e.what());
              continue;
          };
  
          CPubKey cpkT = ckey.GetPubKey();
  
          if (!cpkT.IsValid())
          {
              printf("cpkT is invalid.\n");
              continue;
          };
  
          if (cpkT != pubKey)
          {
              printf("Error: Generated secret does not match.\n");
              continue;
          };
  
          if (!ckey.IsValid())
          {
              printf("Reconstructed key is invalid.\n");
              continue;
          };
  
          if (fDebug)
          {
              CKeyID keyID = cpkT.GetID();
              CAequitasCoinAddress coinAddress(keyID);
              printf("Adding secret to key %s.\n", coinAddress.ToString().c_str());
          };
  
          if (!AddKey(ckey))
          {
              printf("AddKey failed.\n");
              continue;
          };
  
          if (!CWalletDB(strWalletFile).EraseStealthKeyMeta(ckid))
              printf("EraseStealthKeyMeta failed for %s\n", addr.ToString().c_str());
      };
      return true;
  }
  
  bool CWallet::UpdateStealthAddress(std::string &addr, std::string &label, bool addIfNotExist)
  {
      if (fDebug)
          printf("UpdateStealthAddress %s\n", addr.c_str());
  
  
      CStealthAddress sxAddr;
  
      if (!sxAddr.SetEncoded(addr))
          return false;
  
      std::set<CStealthAddress>::iterator it;
      it = stealthAddresses.find(sxAddr);
  
      ChangeType nMode = CT_UPDATED;
      CStealthAddress sxFound;
      if (it == stealthAddresses.end())
      {
          if (addIfNotExist)
          {
              sxFound = sxAddr;
              sxFound.label = label;
              stealthAddresses.insert(sxFound);
              nMode = CT_NEW;
          } else
          {
              printf("UpdateStealthAddress %s, not in set\n", addr.c_str());
              return false;
          };
      } else
      {
          sxFound = const_cast<CStealthAddress&>(*it);
  
          if (sxFound.label == label)
          {
              // no change
              return true;
          };
  
          it->label = label; // update in .stealthAddresses
  
          if (sxFound.scan_secret.size() == ec_secret_size)
          {
              printf("UpdateStealthAddress: todo - update owned stealth address.\n");
              return false;
          };
      };
  
      sxFound.label = label;
  
      if (!CWalletDB(strWalletFile).WriteStealthAddress(sxFound))
      {
          printf("UpdateStealthAddress(%s) Write to db failed.\n", addr.c_str());
          return false;
      };
  
      bool fOwned = sxFound.scan_secret.size() == ec_secret_size;
      NotifyAddressBookChanged(this, sxFound, sxFound.label, fOwned, nMode);
  
      return true;
  }
  
  bool CWallet::CreateStealthTransaction(CScript scriptPubKey, int64_t nValue, std::vector<uint8_t>& P, std::vector<uint8_t>& narr, std::string& sNarr, CWalletTx& wtxNew, CReserveKey& reservekey, int64_t& nFeeRet, const CCoinControl* coinControl)
  {
      vector< pair<CScript, int64_t> > vecSend;
      vecSend.push_back(make_pair(scriptPubKey, nValue));
  
      CScript scriptP = CScript() << OP_RETURN << P;
      if (narr.size() > 0)
          scriptP = scriptP << OP_RETURN << narr;
  
      vecSend.push_back(make_pair(scriptP, 0));
  
      // -- shuffle inputs, change output won't mix enough as it must be not fully random for plantext narrations
      std::random_shuffle(vecSend.begin(), vecSend.end());
  
      int nChangePos;
      std::string strFailReason;
      bool rv = CreateTransaction(vecSend, wtxNew, reservekey, nFeeRet, nChangePos, strFailReason, coinControl);
      if(!strFailReason.empty())
          LogPrintf("CreateStealthTransaction(): %s\n", strFailReason);
  
      // -- the change txn is inserted in a random pos, check here to match narr to output
      if (rv && narr.size() > 0)
      {
          for (unsigned int k = 0; k < wtxNew.vout.size(); ++k)
          {
              if (wtxNew.vout[k].scriptPubKey != scriptPubKey
                  || wtxNew.vout[k].nValue != nValue)
                  continue;
  
              char key[64];
              if (snprintf(key, sizeof(key), "n_%u", k) < 1)
              {
                  printf("CreateStealthTransaction(): Error creating narration key.");
                  break;
              };
              wtxNew.mapValue[key] = sNarr;
              break;
          };
      };
  
      return rv;
  }
  
  string CWallet::SendStealthMoney(CScript scriptPubKey, int64_t nValue, std::vector<uint8_t>& P, std::vector<uint8_t>& narr, std::string& sNarr, CWalletTx& wtxNew, bool fAskFee)
  {
      CReserveKey reservekey(this);
      int64_t nFeeRequired;
  
      if (IsLocked())
      {
          string strError = _("Error: Wallet locked, unable to create transaction  ");
          LogPrintf("SendStealthMoney() : %s\n", strError.c_str());
          return strError;
      }
      if (fWalletUnlockStakingOnly)
      {
          string strError = _("Error: Wallet unlocked for staking only, unable to create transaction.");
          LogPrintf("SendStealthMoney() : %s\n", strError.c_str());
          return strError;
      }
      if (!CreateStealthTransaction(scriptPubKey, nValue, P, narr, sNarr, wtxNew, reservekey, nFeeRequired))
      {
          string strError;
          if (nValue + nFeeRequired > GetBalance())
              strError = 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());
          else
              strError = "Failed to Create transaction";
  
          LogPrintf("SendStealthMoney() : %s\n", strError.c_str());
          return strError;
      }
  
      if (fAskFee && !uiInterface.ThreadSafeAskFee(nFeeRequired, _("Sending...")))
          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.");
  
      return "";
  }
  
  bool CWallet::SendStealthMoneyToDestination(CStealthAddress& sxAddress, int64_t nValue, std::string& sNarr, CWalletTx& wtxNew, std::string& sError, bool fAskFee)
  {
      // -- Check amount
      if (nValue <= 0)
      {
          sError = "Invalid amount";
          return false;
      };
      if (nValue + nTransactionFee + (1) > GetBalance())
      {
          sError = "Insufficient funds";
          return false;
      };
  
  
      ec_secret ephem_secret;
      ec_secret secretShared;
      ec_point pkSendTo;
      ec_point ephem_pubkey;
  
      if (GenerateRandomSecret(ephem_secret) != 0)
      {
          sError = "GenerateRandomSecret failed.";
          return false;
      };
  
      if (StealthSecret(ephem_secret, sxAddress.scan_pubkey, sxAddress.spend_pubkey, secretShared, pkSendTo) != 0)
      {
          sError = "Could not generate receiving public key.";
          return false;
      };
  
      CPubKey cpkTo(pkSendTo);
      if (!cpkTo.IsValid())
      {
          sError = "Invalid public key generated.";
          return false;
      };
  
      CKeyID ckidTo = cpkTo.GetID();
  
      CAequitasCoinAddress addrTo(ckidTo);
  
      if (SecretToPublicKey(ephem_secret, ephem_pubkey) != 0)
      {
          sError = "Could not generate ephem public key.";
          return false;
      };
  
      if (fDebug)
      {
          LogPrintf("Stealth send to generated pubkey %" PRIszu": %s\n", pkSendTo.size(), HexStr(pkSendTo).c_str());
          LogPrintf("hash %s\n", addrTo.ToString().c_str());
          LogPrintf("ephem_pubkey %" PRIszu": %s\n", ephem_pubkey.size(), HexStr(ephem_pubkey).c_str());
      };
  
      std::vector<unsigned char> vchNarr;
  
      // -- Parse Aequitas-Coin address
      CScript scriptPubKey;
      scriptPubKey.SetDestination(addrTo.Get());
  
      if ((sError = SendStealthMoney(scriptPubKey, nValue, ephem_pubkey, vchNarr, sNarr, wtxNew, fAskFee)) != "")
          return false;
  
  
      return true;
  }
  
  bool CWallet::FindStealthTransactions(const CTransaction& tx, mapValue_t& mapNarr)
  {
      if (fDebug)
          LogPrintf("FindStealthTransactions() tx: %s\n", tx.GetHash().GetHex().c_str());
  
      mapNarr.clear();
  
      LOCK(cs_wallet);
      ec_secret sSpendR;
      ec_secret sSpend;
      ec_secret sScan;
      ec_secret sShared;
  
      ec_point pkExtracted;
  
      std::vector<uint8_t> vchEphemPK;
      std::vector<uint8_t> vchDataB;
      std::vector<uint8_t> vchENarr;
      opcodetype opCode;
      char cbuf[256];
  
      int32_t nOutputIdOuter = -1;
      BOOST_FOREACH(const CTxOut& txout, tx.vout)
      {
          nOutputIdOuter++;
          // -- for each OP_RETURN need to check all other valid outputs
  
          //printf("txout scriptPubKey %s\n",  txout.scriptPubKey.ToString().c_str());
          CScript::const_iterator itTxA = txout.scriptPubKey.begin();
  
          if (!txout.scriptPubKey.GetOp(itTxA, opCode, vchEphemPK)
              || opCode != OP_RETURN)
              continue;
          else
          if (!txout.scriptPubKey.GetOp(itTxA, opCode, vchEphemPK)
              || vchEphemPK.size() != 33)
          {
              // -- look for plaintext narrations
              if (vchEphemPK.size() > 1
                  && vchEphemPK[0] == 'n'
                  && vchEphemPK[1] == 'p')
              {
                  if (txout.scriptPubKey.GetOp(itTxA, opCode, vchENarr)
                      && opCode == OP_RETURN
                      && txout.scriptPubKey.GetOp(itTxA, opCode, vchENarr)
                      && vchENarr.size() > 0)
                  {
                      std::string sNarr = std::string(vchENarr.begin(), vchENarr.end());
  
                      snprintf(cbuf, sizeof(cbuf), "n_%d", nOutputIdOuter-1); // plaintext narration always matches preceding value output
                      mapNarr[cbuf] = sNarr;
                  } else
                  {
                      printf("Warning: FindStealthTransactions() tx: %s, Could not extract plaintext narration.\n", tx.GetHash().GetHex().c_str());
                  };
              }
  
              continue;
          }
  
          int32_t nOutputId = -1;
          nStealth++;
          BOOST_FOREACH(const CTxOut& txoutB, tx.vout)
          {
              nOutputId++;
  
              if (&txoutB == &txout)
                  continue;
  
              bool txnMatch = false; // only 1 txn will match an ephem pk
              //printf("txoutB scriptPubKey %s\n",  txoutB.scriptPubKey.ToString().c_str());
  
              CTxDestination address;
              if (!ExtractDestination(txoutB.scriptPubKey, address))
                  continue;
  
              if (address.type() != typeid(CKeyID))
                  continue;
  
              CKeyID ckidMatch = boost::get<CKeyID>(address);
  
              if (HaveKey(ckidMatch)) // no point checking if already have key
                  continue;
  
              std::set<CStealthAddress>::iterator it;
              for (it = stealthAddresses.begin(); it != stealthAddresses.end(); ++it)
              {
                  if (it->scan_secret.size() != ec_secret_size)
                      continue; // stealth address is not owned
  
                  //printf("it->Encodeded() %s\n",  it->Encoded().c_str());
                  memcpy(&sScan.e[0], &it->scan_secret[0], ec_secret_size);
  
                  if (StealthSecret(sScan, vchEphemPK, it->spend_pubkey, sShared, pkExtracted) != 0)
                  {
                      printf("StealthSecret failed.\n");
                      continue;
                  };
                  //printf("pkExtracted %"PRIszu": %s\n", pkExtracted.size(), HexStr(pkExtracted).c_str());
  
                  CPubKey cpkE(pkExtracted);
  
                  if (!cpkE.IsValid())
                      continue;
                  CKeyID ckidE = cpkE.GetID();
  
                  if (ckidMatch != ckidE)
                      continue;
  
                  if (fDebug)
                      printf("Found stealth txn to address %s\n", it->Encoded().c_str());
  
                  if (IsLocked())
                  {
                      if (fDebug)
                          printf("Wallet is locked, adding key without secret.\n");
  
                      // -- add key without secret
                      std::vector<uint8_t> vchEmpty;
                      AddCryptedKey(cpkE, vchEmpty);
                      CKeyID keyId = cpkE.GetID();
                      CAequitasCoinAddress coinAddress(keyId);
                      std::string sLabel = it->Encoded();
                      SetAddressBookName(keyId, sLabel);
  
                      CPubKey cpkEphem(vchEphemPK);
                      CPubKey cpkScan(it->scan_pubkey);
                      CStealthKeyMetadata lockedSkMeta(cpkEphem, cpkScan);
  
                      if (!CWalletDB(strWalletFile).WriteStealthKeyMeta(keyId, lockedSkMeta))
                          printf("WriteStealthKeyMeta failed for %s\n", coinAddress.ToString().c_str());
  
                      mapStealthKeyMeta[keyId] = lockedSkMeta;
                      nFoundStealth++;
                  } else
                  {
                      if (it->spend_secret.size() != ec_secret_size)
                          continue;
                      memcpy(&sSpend.e[0], &it->spend_secret[0], ec_secret_size);
  
  
                      if (StealthSharedToSecretSpend(sShared, sSpend, sSpendR) != 0)
                      {
                          printf("StealthSharedToSecretSpend() failed.\n");
                          continue;
                      };
  
                      ec_point pkTestSpendR;
                      if (SecretToPublicKey(sSpendR, pkTestSpendR) != 0)
                      {
                          printf("SecretToPublicKey() failed.\n");
                          continue;
                      };
  
                      CSecret vchSecret;
                      vchSecret.resize(ec_secret_size);
  
                      memcpy(&vchSecret[0], &sSpendR.e[0], ec_secret_size);
                      CKey ckey;
  
                      try {
              ckey.Set(vchSecret.begin(), vchSecret.end(), true);
                          //ckey.SetSecret(vchSecret, true);
                      } catch (std::exception& e) {
                          printf("ckey.SetSecret() threw: %s.\n", e.what());
                          continue;
                      };
  
                      CPubKey cpkT = ckey.GetPubKey();
                      if (!cpkT.IsValid())
                      {
                          printf("cpkT is invalid.\n");
                          continue;
                      };
  
                      if (!ckey.IsValid())
                      {
                          printf("Reconstructed key is invalid.\n");
                          continue;
                      };
  
                      CKeyID keyID = cpkT.GetID();
                      if (fDebug)
                      {
                          CAequitasCoinAddress coinAddress(keyID);
                          printf("Adding key %s.\n", coinAddress.ToString().c_str());
                      };
  
                      if (!AddKey(ckey))
                      {
                          printf("AddKey failed.\n");
                          continue;
                      };
  
                      std::string sLabel = it->Encoded();
                      SetAddressBookName(keyID, sLabel);
                      nFoundStealth++;
                  };
  
                  txnMatch = true;
                  break;
              };
              if (txnMatch)
                  break;
          };
      };
  
      return true;
  };
  
  uint64_t CWallet::GetStakeWeight() const
  {
      // Choose coins to use
      int64_t nBalance = GetBalance();
  
      if (nBalance <= nReserveBalance)
          return 0;
  
      vector<const CWalletTx*> vwtxPrev;
  
      set<pair<const CWalletTx*,unsigned int> > setCoins;
      int64_t nValueIn = 0;
  
      if (!SelectCoinsForStaking(nBalance - nReserveBalance, GetTime(), setCoins, nValueIn))
          return 0;
  
      if (setCoins.empty())
          return 0;
  
      uint64_t nWeight = 0;
  
      LOCK2(cs_main, cs_wallet);
      BOOST_FOREACH(PAIRTYPE(const CWalletTx*, unsigned int) pcoin, setCoins)
      {
          if (pcoin.first->GetDepthInMainChain() >= nStakeMinConfirmations)
              nWeight += pcoin.first->vout[pcoin.second].nValue;
      }
  
      return nWeight;
  }
  
  bool CWallet::CreateCoinStake(const CKeyStore& keystore, unsigned int nBits, int64_t nSearchInterval, int64_t nFees, CTransaction& txNew, CKey& key)
  {
      CBlockIndex* pindexPrev = pindexBest;
      CBigNum bnTargetPerCoinDay;
      bnTargetPerCoinDay.SetCompact(nBits);
  
      txNew.vin.clear();
      txNew.vout.clear();
  
      // OLD IMPLEMENTATION COMMNETED OUT
      //
      // Determine our payment script for devops
      // CScript devopsScript;
      // devopsScript << OP_DUP << OP_HASH160 << ParseHex(Params().DevOpsPubKey()) << OP_EQUALVERIFY << OP_CHECKSIG;
  
      // Mark coin stake transaction
      CScript scriptEmpty;
      scriptEmpty.clear();
      txNew.vout.push_back(CTxOut(0, scriptEmpty));
  
      // Choose coins to use
      int64_t nBalance = GetBalance();
  
      if (nBalance <= nReserveBalance)
          return false;
  
      vector<const CWalletTx*> vwtxPrev;
  
      set<pair<const CWalletTx*,unsigned int> > setCoins;
      int64_t nValueIn = 0;
  
      // Select coins with suitable depth
      if (!SelectCoinsForStaking(nBalance - nReserveBalance, txNew.nTime, setCoins, nValueIn))
          return false;
  
      if (setCoins.empty())
          return false;
  
      int64_t nCredit = 0;
      CScript scriptPubKeyKernel;
      CTxDB txdb("r");
      BOOST_FOREACH(PAIRTYPE(const CWalletTx*, unsigned int) pcoin, setCoins)
      {
          static int nMaxStakeSearchInterval = 60;
          bool fKernelFound = false;
          for (unsigned int n=0; n<min(nSearchInterval,(int64_t)nMaxStakeSearchInterval) && !fKernelFound && pindexPrev == pindexBest; n++)
          {
              boost::this_thread::interruption_point();
              // Search backward in time from the given txNew timestamp
              // Search nSearchInterval seconds back up to nMaxStakeSearchInterval
              COutPoint prevoutStake = COutPoint(pcoin.first->GetHash(), pcoin.second);
              int64_t nBlockTime;
              if (CheckKernel(pindexPrev, nBits, txNew.nTime - n, prevoutStake, &nBlockTime))
              {
                  // Found a kernel
                  LogPrint("coinstake", "CreateCoinStake : kernel found\n");
                  vector<valtype> vSolutions;
                  txnouttype whichType;
                  CScript scriptPubKeyOut;
                  scriptPubKeyKernel = pcoin.first->vout[pcoin.second].scriptPubKey;
                  if (!Solver(scriptPubKeyKernel, whichType, vSolutions))
                  {
                      LogPrint("coinstake", "CreateCoinStake : failed to parse kernel\n");
                      break;
                  }
                  LogPrint("coinstake", "CreateCoinStake : parsed kernel type=%d\n", whichType);
                  if (whichType != TX_PUBKEY && whichType != TX_PUBKEYHASH)
                  {
                      LogPrint("coinstake", "CreateCoinStake : no support for kernel type=%d\n", whichType);
                      break;  // only support pay to public key and pay to address
                  }
                  if (whichType == TX_PUBKEYHASH) // pay to address type
                  {
                      // convert to pay to public key type
                      if (!keystore.GetKey(uint160(vSolutions[0]), key))
                      {
                          LogPrint("coinstake", "CreateCoinStake : failed to get key for kernel type=%d\n", whichType);
                          break;  // unable to find corresponding public key
                      }
                      scriptPubKeyOut << key.GetPubKey() << OP_CHECKSIG;
                  }
                  if (whichType == TX_PUBKEY)
                  {
                      valtype& vchPubKey = vSolutions[0];
                      if (!keystore.GetKey(Hash160(vchPubKey), key))
                      {
                          LogPrint("coinstake", "CreateCoinStake : failed to get key for kernel type=%d\n", whichType);
                          break;  // unable to find corresponding public key
                      }
  
                      if (key.GetPubKey() != vchPubKey)
                      {
                          LogPrint("coinstake", "CreateCoinStake : invalid key for kernel type=%d\n", whichType);
                          break; // keys mismatch
                      }
  
                      scriptPubKeyOut = scriptPubKeyKernel;
                  }
  
                  txNew.nTime -= n;
                  txNew.vin.push_back(CTxIn(pcoin.first->GetHash(), pcoin.second));
                  nCredit += pcoin.first->vout[pcoin.second].nValue;
                  vwtxPrev.push_back(pcoin.first);
                  txNew.vout.push_back(CTxOut(0, scriptPubKeyOut));
  
                  if(nCredit > GetStakeSplitThreshold())
                      txNew.vout.push_back(CTxOut(0, scriptPubKeyOut)); //split stake
                  LogPrint("coinstake", "CreateCoinStake : added kernel type=%d\n", whichType);
                  fKernelFound = true;
                  break;
              }
          }
  
          if (fKernelFound)
              break; // if kernel is found stop searching
      }
  
      if (nCredit == 0 || nCredit > nBalance - nReserveBalance)
          return false;
  
      BOOST_FOREACH(PAIRTYPE(const CWalletTx*, unsigned int) pcoin, setCoins)
      {
          // Attempt to add more inputs
          // Only add coins of the same key/address as kernel
          if (txNew.vout.size() == 2 && ((pcoin.first->vout[pcoin.second].scriptPubKey == scriptPubKeyKernel || pcoin.first->vout[pcoin.second].scriptPubKey == txNew.vout[1].scriptPubKey))
              && pcoin.first->GetHash() != txNew.vin[0].prevout.hash)
          {
              int64_t nTimeWeight = GetWeight((int64_t)pcoin.first->nTime, (int64_t)txNew.nTime);
  
              // Stop adding more inputs if already too many inputs
              if (txNew.vin.size() >= 100)
                  break;
              // Stop adding more inputs if value is already pretty significant
              if (nCredit >= GetStakeCombineThreshold())
                  break;
              // Stop adding inputs if reached reserve limit
              if (nCredit + pcoin.first->vout[pcoin.second].nValue > nBalance - nReserveBalance)
                  break;
              // Do not add additional significant input
              if (pcoin.first->vout[pcoin.second].nValue >= GetStakeCombineThreshold())
                  continue;
              // Do not add input that is still too young
              if (nTimeWeight < nStakeMinAge)
                  continue;
  
              txNew.vin.push_back(CTxIn(pcoin.first->GetHash(), pcoin.second));
              nCredit += pcoin.first->vout[pcoin.second].nValue;
              vwtxPrev.push_back(pcoin.first);
          }
      }
  
      // Calculate coin age reward
      int64_t nReward;
      {
          uint64_t nCoinAge;
          CTxDB txdb("r");
          if (!txNew.GetCoinAge(txdb, pindexPrev, nCoinAge))
              return error("CreateCoinStake : failed to calculate coin age");
  
          nReward = GetProofOfStakeReward(pindexPrev, nCoinAge, nFees);
          if (nReward <= 0)
              return false;
  
          nCredit += nReward;
      }
  
      // Set TX values
      CScript payee;
      CScript devpayee;
      CTxIn vin;
      nPoSageReward = nReward;
  
      // define address
      CBitcoinAddress devopaddress;
      if (Params().NetworkID() == CChainParams::MAIN) {
          devopaddress = CBitcoinAddress("Dtz6UgAxwavsnxnb7jeSRj5cgERLvV8KBy");
      } else if (Params().NetworkID() == CChainParams::TESTNET) {
          devopaddress = CBitcoinAddress("");
      } else if (Params().NetworkID() == CChainParams::REGTEST) {
          devopaddress = CBitcoinAddress("");
      }
  
      // Masternode Payments
      int payments = 1;
      // start masternode payments
      bool bMasterNodePayment = false;
  
      if ( Params().NetworkID() == CChainParams::TESTNET ){
          if (GetTime() > START_MASTERNODE_PAYMENTS_TESTNET ){
              bMasterNodePayment = true;
          }
      }else{
          if (GetTime() > START_MASTERNODE_PAYMENTS){
              bMasterNodePayment = true;
          }
      }
      // stop masternode payments (for testing)
      if ( Params().NetworkID() == CChainParams::TESTNET ){
          if (GetTime() > STOP_MASTERNODE_PAYMENTS_TESTNET ){
              bMasterNodePayment = false;
          }
      }else{
          if (GetTime() > STOP_MASTERNODE_PAYMENTS){
              bMasterNodePayment = false;
          }
      }
  
      bool hasPayment = true;
      if(bMasterNodePayment) {
          //spork
          if(!masternodePayments.GetBlockPayee(pindexPrev->nHeight+1, payee, vin)){
              CMasternode* winningNode = mnodeman.GetCurrentMasterNode(1);
              if(winningNode){
                  payee = GetScriptForDestination(winningNode->pubkey.GetID());
              } else {
                  payee = GetScriptForDestination(devopaddress.Get());
              }
          }
      } else {
          hasPayment = false;
      }
  
      if(hasPayment){
          payments = txNew.vout.size() + 1;
          txNew.vout.resize(payments);
  
          txNew.vout[payments-1].scriptPubKey = payee;
          txNew.vout[payments-1].nValue = 0;
  
          CTxDestination address1;
          ExtractDestination(payee, address1);
          CAequitasCoinAddress address2(address1);
  
          LogPrintf("Masternode payment to %s\n", address2.ToString().c_str());
      }
  
      // TODO: Clean this up, it's a mess (could be done much more cleanly)
      //       Not an issue otherwise, merely a pet peev. Done in a rush...
      //
      // DevOps Payments
      int devoppay = 1;
      // start devops payments
      bool bDevOpsPayment = false;
  
      if ( Params().NetworkID() == CChainParams::TESTNET ){
          if (GetTime() > START_DEVOPS_PAYMENTS_TESTNET ){
              bDevOpsPayment = true;
          }
      }else{
          if (GetTime() > START_DEVOPS_PAYMENTS){
              bDevOpsPayment = true;
          }
      }
      // stop devops payments (for testing)
      if ( Params().NetworkID() == CChainParams::TESTNET ){
          if (GetTime() > STOP_DEVOPS_PAYMENTS_TESTNET ){
              bDevOpsPayment = false;
          }
      }else{
          if (GetTime() > STOP_DEVOPS_PAYMENTS){
              bDevOpsPayment = false;
          }
      }
  
      bool hasdevopsPay = true;
      if(bDevOpsPayment) {
  
          // verify address
          if(devopaddress.IsValid())
          {
              //spork
              if(pindexBest->GetBlockTime() > 1546123500) { // ON  (Saturday, December 29, 2018 10:45 PM)
                      devpayee = GetScriptForDestination(devopaddress.Get());
              }
              else {
                  hasdevopsPay = false;
              }
          }
          else
          {
              return error("CreateCoinStake: Failed to detect dev address to pay\n");
          }
      }
      else {
          hasdevopsPay = false;
      }
  
      if(hasdevopsPay){
          devoppay = txNew.vout.size() + 1;
          txNew.vout.resize(devoppay);
  
          txNew.vout[devoppay-1].scriptPubKey = devpayee;
          txNew.vout[devoppay-1].nValue = 0;
  
          CTxDestination address1;
          ExtractDestination(devpayee, address1);
          CAequitasCoinAddress address2(address1);
  
          LogPrintf("DevOps payment to %s\n", address2.ToString().c_str());
      }
  
      int64_t blockValue = nCredit;
      int64_t masternodePayment = GetMasternodePayment(pindexPrev->nHeight+1, nReward);
      int64_t devopsPayment = GetDevOpsPayment(pindexPrev->nHeight+1, nReward); // TODO: Activate devops
  
  
      // Set output amount
      // Standard stake (no Masternode or DevOps payments)
      if (!hasPayment && !hasdevopsPay)
      {
          if(txNew.vout.size() == 3){ // 2 stake outputs, stake was split, no masternode payment
              txNew.vout[1].nValue = (blockValue / 2 / CENT) * CENT;
              txNew.vout[2].nValue = blockValue - txNew.vout[1].nValue;
          }
          else if(txNew.vout.size() == 2){ // only 1 stake output, was not split, no masternode payment
              txNew.vout[1].nValue = blockValue;
          }
      }
      else if(hasPayment && !hasdevopsPay)
      {
          if(txNew.vout.size() == 4){ // 2 stake outputs, stake was split, plus a masternode payment
              txNew.vout[payments-1].nValue = masternodePayment;
              blockValue -= masternodePayment;
              txNew.vout[1].nValue = (blockValue / 2 / CENT) * CENT;
              txNew.vout[2].nValue = blockValue - txNew.vout[1].nValue;
          }
          else if(txNew.vout.size() == 3){ // only 1 stake output, was not split, plus a masternode payment
              txNew.vout[payments-1].nValue = masternodePayment;
              blockValue -= masternodePayment;
              txNew.vout[1].nValue = blockValue;
          }
      }
      else if(!hasPayment && hasdevopsPay)
      {
          if(txNew.vout.size() == 4){ // 2 stake outputs, stake was split, plus a devops payment
              txNew.vout[devoppay-1].nValue = devopsPayment;
              blockValue -= devopsPayment;
              txNew.vout[1].nValue = (blockValue / 2 / CENT) * CENT;
              txNew.vout[2].nValue = blockValue - txNew.vout[1].nValue;
          }
          else if(txNew.vout.size() == 3){ // only 1 stake output, was not split, plus a devops payment
              txNew.vout[devoppay-1].nValue = devopsPayment;
              blockValue -= devopsPayment;
              txNew.vout[1].nValue = blockValue;
          }
      }
      else if(hasPayment && hasdevopsPay)
      {
          if(txNew.vout.size() == 5){ // 2 stake outputs, stake was split, plus a devops AND masternode payment
              txNew.vout[payments-1].nValue = masternodePayment;
              blockValue -= masternodePayment;
              txNew.vout[devoppay-1].nValue = devopsPayment;
              blockValue -= devopsPayment;
              txNew.vout[1].nValue = (blockValue / 2 / CENT) * CENT;
              txNew.vout[2].nValue = blockValue - txNew.vout[1].nValue;
          }
          else if(txNew.vout.size() == 4){ // only 1 stake output, was not split, plus a devops AND masternode payment
              txNew.vout[payments-1].nValue = masternodePayment;
              blockValue -= masternodePayment;
              txNew.vout[devoppay-1].nValue = devopsPayment;
              blockValue -= devopsPayment;
              txNew.vout[1].nValue = blockValue;
          }
      }
  
      // Sign
      int nIn = 0;
      BOOST_FOREACH(const CWalletTx* pcoin, vwtxPrev)
      {
          if (!SignSignature(*this, *pcoin, txNew, nIn++))
              return error("CreateCoinStake : failed to sign coinstake");
      }
  
      // Limit size
      unsigned int nBytes = ::GetSerializeSize(txNew, SER_NETWORK, PROTOCOL_VERSION);
      if (nBytes >= MAX_BLOCK_SIZE_GEN/5)
          return error("CreateCoinStake : exceeded coinstake size limit");
  
      // Successfully generated coinstake
      return true;
  }
  
  
  // Call after CreateTransaction unless you want to abort
  bool CWallet::CommitTransaction(CWalletTx& wtxNew, CReserveKey& reservekey, std::string strCommand)
  {
      mapValue_t mapNarr;
      FindStealthTransactions(wtxNew, mapNarr);
  
      if (!mapNarr.empty())
      {
          BOOST_FOREACH(const PAIRTYPE(string,string)& item, mapNarr)
              wtxNew.mapValue[item.first] = item.second;
      };
  
      {
          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);
  
              // Mark old coins as spent
              set<CWalletTx*> setCoins;
              BOOST_FOREACH(const CTxIn& txin, wtxNew.vin)
              {
                  CWalletTx &coin = mapWallet[txin.prevout.hash];
                  coin.BindWallet(this);
                  coin.MarkSpent(txin.prevout.n);
                  coin.WriteToDisk();
                  NotifyTransactionChanged(this, coin.GetHash(), CT_UPDATED);
              }
  
              if (fFileBacked)
                  delete pwalletdb;
          }
  
          // Track how many getdata requests our transaction gets
          mapRequestCount[wtxNew.GetHash()] = 0;
  
          // Broadcast
          if (!wtxNew.AcceptToMemoryPool(false))
          {
              // This must not fail. The transaction has already been signed and recorded.
              LogPrintf("CommitTransaction() : Error: Transaction not valid\n");
              return false;
          }
          wtxNew.RelayWalletTransaction(strCommand);
      }
      return true;
  }
  
  bool CWallet::AddAccountingEntry(const CAccountingEntry& acentry, CWalletDB & pwalletdb)
  {
      if (!pwalletdb.WriteAccountingEntry_Backend(acentry))
          return false;
  
      laccentries.push_back(acentry);
      CAccountingEntry & entry = laccentries.back();
      wtxOrdered.insert(make_pair(entry.nOrderPos, TxPair((CWalletTx*)0, &entry)));
  
      return true;
  }
  
  string CWallet::SendMoney(CScript scriptPubKey, int64_t nValue, std::string& sNarr, CWalletTx& wtxNew, bool fAskFee)
  {
      CReserveKey reservekey(this);
      int64_t nFeeRequired;
  
      if (IsLocked())
      {
          string strError = _("Error: Wallet locked, unable to create transaction!");
          LogPrintf("SendMoney() : %s", strError);
          return strError;
      }
      if (fWalletUnlockStakingOnly)
      {
          string strError = _("Error: Wallet unlocked for staking only, unable to create transaction.");
          LogPrintf("SendMoney() : %s", strError);
          return strError;
      }
  
      CWalletTx wtx;
      std::vector<std::pair<CScript, int64_t> > vecSend;
      vecSend.push_back(make_pair(scriptPubKey, nValue));
      string strError = "";
  
  
      if (!CreateTransaction(scriptPubKey, nValue, sNarr, wtxNew, reservekey, nFeeRequired))
      {
          string strError;
          if (nValue + nFeeRequired > GetBalance())
              strError = 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));
          else
              strError = "Failed to Create transaction";
  
          LogPrintf("SendMoney() : %s\n", strError);
          return strError;
      }
  
      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.");
  
      return "";
  }
  
  
  
  string CWallet::SendMoneyToDestination(const CTxDestination& address, int64_t nValue, std::string& sNarr, CWalletTx& wtxNew, bool fAskFee)
  {
      // Check amount
      if (nValue <= 0)
          return _("Invalid amount");
      if (nValue + nTransactionFee > GetBalance())
          return _("Insufficient funds");
  
      // Parse Aequitas-Coin address
      CScript scriptPubKey;
      scriptPubKey.SetDestination(address);
  
      return SendMoney(scriptPubKey, nValue, sNarr, wtxNew, fAskFee);
  }
  
  int64_t CWallet::GetTotalValue(std::vector<CTxIn> vCoins) {
      int64_t nTotalValue = 0;
      CWalletTx wtx;
      BOOST_FOREACH(CTxIn i, vCoins){
          if (mapWallet.count(i.prevout.hash))
          {
              CWalletTx& wtx = mapWallet[i.prevout.hash];
              if(i.prevout.n < wtx.vout.size()){
                  nTotalValue += wtx.vout[i.prevout.n].nValue;
              }
          } else {
              LogPrintf("GetTotalValue -- Couldn't find transaction\n");
          }
      }
      return nTotalValue;
  }
  
  DBErrors CWallet::LoadWallet(bool& fFirstRunRet)
  {
      if (!fFileBacked)
          return DB_LOAD_OK;
      fFirstRunRet = false;
      DBErrors nLoadWalletRet = CWalletDB(strWalletFile,"cr+").LoadWallet(this);
      if (nLoadWalletRet == DB_NEED_REWRITE)
      {
          if (CDB::Rewrite(strWalletFile, "\x04pool"))
          {
              LOCK(cs_wallet);
              setKeyPool.clear();
              // Note: can't top-up keypool here, because wallet is locked.
              // User will be prompted to unlock wallet the next operation
              // the requires a new key.
          }
      }
  
      if (nLoadWalletRet != DB_LOAD_OK)
          return nLoadWalletRet;
      fFirstRunRet = !vchDefaultKey.IsValid();
  
      return DB_LOAD_OK;
  }
  
  
  bool CWallet::SetAddressBookName(const CTxDestination& address, const string& strName)
  {
      bool fUpdated = false;
      {
          LOCK(cs_wallet); // mapAddressBook
          std::map<CTxDestination, std::string>::iterator mi = mapAddressBook.find(address);
          fUpdated = mi != mapAddressBook.end();
          mapAddressBook[address] = strName;
      }
      NotifyAddressBookChanged(this, address, strName, ::IsMine(*this, address) != ISMINE_NO,
                               (fUpdated ? CT_UPDATED : CT_NEW) );
      if (!fFileBacked)
          return false;
      return CWalletDB(strWalletFile).WriteName(CAequitasCoinAddress(address).ToString(), strName);
  }
  
  bool CWallet::DelAddressBookName(const CTxDestination& address)
  {
      {
          LOCK(cs_wallet); // mapAddressBook
  
          mapAddressBook.erase(address);
      }
  
      NotifyAddressBookChanged(this, address, "", ::IsMine(*this, address) != ISMINE_NO, CT_DELETED);
  
      if (!fFileBacked)
          return false;
      CWalletDB(strWalletFile).EraseName(CAequitasCoinAddress(address).ToString());
      return CWalletDB(strWalletFile).EraseName(CAequitasCoinAddress(address).ToString());
  }
  
  bool CWallet::GetTransaction(const uint256 &hashTx, CWalletTx& wtx)
  {
      {
          LOCK(cs_wallet);
          map<uint256, CWalletTx>::iterator mi = mapWallet.find(hashTx);
          if (mi != mapWallet.end())
          {
              wtx = (*mi).second;
              return true;
          }
      }
      return false;
  }
  
  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;
  
          fLiteMode = GetBoolArg("-litemode", false);
          int64_t nKeys;
  
          if (fLiteMode)
              nKeys = max(GetArg("-keypool", 100), (int64_t)0);
          else
              nKeys = max(GetArg("-keypool", 1000), (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 nSize)
  {
      {
          LOCK(cs_wallet);
  
          if (IsLocked())
              return false;
  
          CWalletDB walletdb(strWalletFile);
  
          // Top up key pool
          unsigned int nTargetSize;
          fLiteMode = GetBoolArg("-litemode", false);
  
          if (nSize > 0)
              nTargetSize = nSize;
          else if (fLiteMode)
              nTargetSize = max(GetArg("-keypool", 100), (int64_t)0);
          else
              nTargetSize = max(GetArg("-keypool", 1000), (int64_t)0);
  
          while (setKeyPool.size() < (nTargetSize + 1))
          {
              int64_t nEnd = 1;
              if (!setKeyPool.empty())
                  nEnd = *(--setKeyPool.end()) + 1;
              if (!walletdb.WritePool(nEnd, CKeyPool(GenerateNewKey())))
                  throw runtime_error("TopUpKeyPool() : writing generated key failed");
              setKeyPool.insert(nEnd);
              LogPrintf("keypool added key %d, size=%u\n", nEnd, setKeyPool.size());
              double dProgress = 100.f * nEnd / (nTargetSize + 1);
              std::string strMsg = strprintf(_("Loading wallet... (%3.2f %%)"), dProgress);
              uiInterface.InitMessage(strMsg);
          }
      }
      return true;
  }
  
  
  void CWallet::ReserveKeyFromKeyPool(int64_t& nIndex, CKeyPool& keypool)
  {
      nIndex = -1;
      keypool.vchPubKey = CPubKey();
      {
          LOCK(cs_wallet);
  
          if (!IsLocked())
              TopUpKeyPool();
  
          // Get the oldest key
          if(setKeyPool.empty())
              return;
  
          CWalletDB walletdb(strWalletFile);
  
          nIndex = *(setKeyPool.begin());
          setKeyPool.erase(setKeyPool.begin());
          if (!walletdb.ReadPool(nIndex, keypool))
              throw runtime_error("ReserveKeyFromKeyPool() : read failed");
          if (!HaveKey(keypool.vchPubKey.GetID()))
              throw runtime_error("ReserveKeyFromKeyPool() : unknown key in key pool");
          assert(keypool.vchPubKey.IsValid());
          LogPrintf("keypool reserve %d\n", nIndex);
      }
  }
  
  int64_t CWallet::AddReserveKey(const CKeyPool& keypool)
  {
      {
          LOCK2(cs_main, cs_wallet);
          CWalletDB walletdb(strWalletFile);
  
          int64_t nIndex = 1 + *(--setKeyPool.end());
          if (!walletdb.WritePool(nIndex, keypool))
              throw runtime_error("AddReserveKey() : writing added key failed");
          setKeyPool.insert(nIndex);
          return nIndex;
      }
      return -1;
  }
  
  void CWallet::KeepKey(int64_t nIndex)
  {
      // Remove from key pool
      if (fFileBacked)
      {
          CWalletDB walletdb(strWalletFile);
          walletdb.ErasePool(nIndex);
      }
      LogPrintf("keypool keep %d\n", nIndex);
  }
  
  void CWallet::ReturnKey(int64_t nIndex)
  {
      // Return to key pool
      {
          LOCK(cs_wallet);
          setKeyPool.insert(nIndex);
      }
      LogPrintf("keypool return %d\n", nIndex);
  }
  
  bool CWallet::GetKeyFromPool(CPubKey& result)
  {
      int64_t nIndex = 0;
      CKeyPool keypool;
      {
          LOCK(cs_wallet);
          ReserveKeyFromKeyPool(nIndex, keypool);
          if (nIndex == -1)
          {
              if (IsLocked()) return false;
              result = GenerateNewKey();
              return true;
          }
          KeepKey(nIndex);
          result = keypool.vchPubKey;
      }
      return true;
  }
  
  int64_t CWallet::GetOldestKeyPoolTime()
  {
      int64_t nIndex = 0;
      CKeyPool keypool;
      ReserveKeyFromKeyPool(nIndex, keypool);
      if (nIndex == -1)
          return GetTime();
      ReturnKey(nIndex);
      return keypool.nTime;
  }
  
  std::map<CTxDestination, int64_t> CWallet::GetAddressBalances()
  {
      map<CTxDestination, int64_t> balances;
  
      {
          LOCK(cs_wallet);
          BOOST_FOREACH(PAIRTYPE(uint256, CWalletTx) walletEntry, mapWallet)
          {
              CWalletTx *pcoin = &walletEntry.second;
  
              if (!IsFinalTx(*pcoin) || !pcoin->IsTrusted())
                  continue;
  
              if ((pcoin->IsCoinBase() || pcoin->IsCoinStake()) && 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;
  
                  int64_t n = pcoin->IsSpent(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 && IsMine(pcoin->vin[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))
                      {
                          CWalletTx tx = mapWallet[pcoin->vin[0].prevout.hash];
                          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;
  }
  
  // ppcoin: check 'spent' consistency between wallet and txindex
  // ppcoin: fix wallet spent state according to txindex
  void CWallet::FixSpentCoins(int& nMismatchFound, int64_t& nBalanceInQuestion, bool fCheckOnly)
  {
      nMismatchFound = 0;
      nBalanceInQuestion = 0;
  
      LOCK(cs_wallet);
      vector<CWalletTx*> vCoins;
      vCoins.reserve(mapWallet.size());
      for (map<uint256, CWalletTx>::iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
          vCoins.push_back(&(*it).second);
  
      CTxDB txdb("r");
      BOOST_FOREACH(CWalletTx* pcoin, vCoins)
      {
          // Find the corresponding transaction index
          CTxIndex txindex;
          if (!txdb.ReadTxIndex(pcoin->GetHash(), txindex))
              continue;
          for (unsigned int n=0; n < pcoin->vout.size(); n++)
          {
              if (IsMine(pcoin->vout[n]) && pcoin->IsSpent(n) && (txindex.vSpent.size() <= n || txindex.vSpent[n].IsNull()))
              {
                  LogPrintf("FixSpentCoins found lost coin %s AEQL %s[%d], %s\n",
                      FormatMoney(pcoin->vout[n].nValue), pcoin->GetHash().ToString(), n, fCheckOnly? "repair not attempted" : "repairing");
                  nMismatchFound++;
                  nBalanceInQuestion += pcoin->vout[n].nValue;
                  if (!fCheckOnly)
                  {
                      pcoin->MarkUnspent(n);
                      pcoin->WriteToDisk();
                  }
              }
              else if (IsMine(pcoin->vout[n]) && !pcoin->IsSpent(n) && (txindex.vSpent.size() > n && !txindex.vSpent[n].IsNull()))
              {
                  LogPrintf("FixSpentCoins found spent coin %s AEQL %s[%d], %s\n",
                      FormatMoney(pcoin->vout[n].nValue), pcoin->GetHash().ToString(), n, fCheckOnly? "repair not attempted" : "repairing");
                  nMismatchFound++;
                  nBalanceInQuestion += pcoin->vout[n].nValue;
                  if (!fCheckOnly)
                  {
                      pcoin->MarkSpent(n);
                      pcoin->WriteToDisk();
                  }
              }
          }
      }
  }
  
  // ppcoin: disable transaction (only for coinstake)
  void CWallet::DisableTransaction(const CTransaction &tx)
  {
      if (!tx.IsCoinStake() || !IsFromMe(tx))
          return; // only disconnecting coinstake requires marking input unspent
  
      LOCK(cs_wallet);
      BOOST_FOREACH(const CTxIn& txin, tx.vin)
      {
          map<uint256, CWalletTx>::iterator mi = mapWallet.find(txin.prevout.hash);
          if (mi != mapWallet.end())
          {
              CWalletTx& prev = (*mi).second;
              if (txin.prevout.n < prev.vout.size() && IsMine(prev.vout[txin.prevout.n]))
              {
                  prev.MarkUnspent(txin.prevout.n);
                  prev.WriteToDisk();
              }
          }
      }
  }
  
  bool CReserveKey::GetReservedKey(CPubKey& pubkey)
  {
      if (nIndex == -1)
      {
          CKeyPool keypool;
          pwallet->ReserveKeyFromKeyPool(nIndex, keypool);
          if (nIndex != -1)
              vchPubKey = keypool.vchPubKey;
          else {
              if (pwallet->vchDefaultKey.IsValid()) {
                  LogPrintf("CReserveKey::GetReservedKey(): Warning: Using default key instead of a new key, top up your keypool!");
                  vchPubKey = pwallet->vchDefaultKey;
              } else
                  return false;
          }
      }
      assert(vchPubKey.IsValid());
      pubkey = vchPubKey;
      return true;
  }
  
  void CReserveKey::KeepKey()
  {
      if (nIndex != -1)
          pwallet->KeepKey(nIndex);
      nIndex = -1;
      vchPubKey = CPubKey();
  }
  
  void CReserveKey::ReturnKey()
  {
      if (nIndex != -1)
          pwallet->ReturnKey(nIndex);
      nIndex = -1;
      vchPubKey = CPubKey();
  }
  
  void CWallet::GetAllReserveKeys(set<CKeyID>& setAddress) const
  {
      setAddress.clear();
  
      CWalletDB walletdb(strWalletFile);
  
      LOCK2(cs_main, cs_wallet);
      BOOST_FOREACH(const int64_t& id, setKeyPool)
      {
          CKeyPool keypool;
          if (!walletdb.ReadPool(id, keypool))
              throw runtime_error("GetAllReserveKeyHashes() : read failed");
          assert(keypool.vchPubKey.IsValid());
          CKeyID keyID = keypool.vchPubKey.GetID();
          if (!HaveKey(keyID))
              throw runtime_error("GetAllReserveKeyHashes() : unknown key in key pool");
          setAddress.insert(keyID);
      }
  }
  
  bool 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);
              return true;
          }
      }
      return false;
  }
  
  void CWallet::LockCoin(COutPoint& output)
  {
      AssertLockHeld(cs_wallet); // setLockedCoins
      setLockedCoins.insert(output);
  }
  
  void CWallet::UnlockCoin(COutPoint& output)
  {
      AssertLockHeld(cs_wallet); // setLockedCoins
      setLockedCoins.erase(output);
  }
  
  void CWallet::UnlockAllCoins()
  {
      AssertLockHeld(cs_wallet); // setLockedCoins
      setLockedCoins.clear();
  }
  
  bool CWallet::IsLockedCoin(uint256 hash, unsigned int n) const
  {
      AssertLockHeld(cs_wallet); // setLockedCoins
      COutPoint outpt(hash, n);
  
      return (setLockedCoins.count(outpt) > 0);
  }
  
  void CWallet::ListLockedCoins(std::vector<COutPoint>& vOutpts)
  {
      AssertLockHeld(cs_wallet); // setLockedCoins
      for (std::set<COutPoint>::iterator it = setLockedCoins.begin();
           it != setLockedCoins.end(); it++) {
          COutPoint outpt = (*it);
          vOutpts.push_back(outpt);
      }
  }
  
  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 = FindBlockByHeight(std::max(0, nBestHeight - 144)); // the tip can be reorganised; use a 144-block safety margin
      std::map<CKeyID, CBlockIndex*> mapKeyFirstBlock;
      std::set<CKeyID> setKeys;
      GetKeys(setKeys);
      BOOST_FOREACH(const CKeyID &keyid, setKeys) {
          if (mapKeyBirth.count(keyid) == 0)
              mapKeyFirstBlock[keyid] = pindexMax;
      }
      setKeys.clear();
  
      // if there are no such keys, we're done
      if (mapKeyFirstBlock.empty())
          return;
  
      // find first block that affects those keys, if there are any left
      std::vector<CKeyID> vAffected;
      for (std::map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); it++) {
          // iterate over all wallet transactions...
          const CWalletTx &wtx = (*it).second;
          std::map<uint256, CBlockIndex*>::const_iterator blit = mapBlockIndex.find(wtx.hashBlock);
          if (blit != mapBlockIndex.end() && blit->second->IsInMainChain()) {
              // ... which are already in a block
              int nHeight = blit->second->nHeight;
              BOOST_FOREACH(const CTxOut &txout, wtx.vout) {
                  // iterate over all their outputs
                  ::ExtractAffectedKeys(*this, txout.scriptPubKey, vAffected);
                  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->nTime - 7200; // block times can be 2h off
  }
  
  bool CWallet::ImportPrivateKey(CAequitasCoinSecret vchSecret, string strLabel, bool fRescan) {
      if (fWalletUnlockStakingOnly)
          return false;
  
      CKey key = vchSecret.GetKey();
      CPubKey pubkey = key.GetPubKey();
      assert(key.VerifyPubKey(pubkey));
      CKeyID vchAddress = pubkey.GetID();
      {
          LOCK2(cs_main, cs_wallet);
  
          MarkDirty();
          SetAddressBookName(vchAddress, strLabel);
  
          // Don't throw error in case a key is already there
          if (HaveKey(vchAddress))
              return true;
  
          mapKeyMetadata[vchAddress].nCreateTime = 1;
  
          if (!AddKeyPubKey(key, pubkey))
              return false;
  
          // whenever a key is imported, we need to scan the whole chain
          nTimeFirstKey = 1; // 0 would be considered 'no value'
  
          if (fRescan) {
              ScanForWalletTransactions(pindexGenesisBlock, true);
              ReacceptWalletTransactions();
          }
      }
  
      return true;
  }
  