text: // Copyright (c) 2009-2010 Satoshi Nakamoto
  // Copyright (c) 2009-2012 The Eyco 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 "coincontrol.h"
  #include "kernel.h"
  #include "net.h"
  #include "timedata.h"
  #include "txdb.h"
  #include "ui_interface.h"
  #include "walletdb.h"
  #include "crypter.h"
  #include "key.h"
  #include "spork.h"
  #include "darksend.h"
  #include "instantx.h"
  #include "masternode.h"
  #include "chainparams.h"
  #include "smessage.h"
  
  #include <boost/algorithm/string/replace.hpp>
  #include <boost/range/algorithm.hpp>
  #include <boost/numeric/ublas/matrix.hpp>
  
  using namespace std;
  
  // Settings
  int64_t nTransactionFee = MIN_TX_FEE;
  int64_t nReserveBalance = 0;
  int64_t nMinimumInputValue = 0;
  
  static int64_t GetStakeCombineThreshold() { return 100000000 * COIN; }
  static int64_t GetStakeSplitThreshold() { return 2 * GetStakeCombineThreshold(); }
  
  int64_t gcd(int64_t n,int64_t m) { return m == 0 ? n : gcd(m, n % m); }
  static uint64_t CoinWeightCost(const COutput &out)
  {
      int64_t nTimeWeight = (int64_t)GetTime() - (int64_t)out.tx->nTime;
      CBigNum bnCoinDayWeight = CBigNum(out.tx->vout[out.i].nValue) * nTimeWeight / (1 * 24 * 60 * 60);
      return bnCoinDayWeight.getuint64();
  }
  
  //////////////////////////////////////////////////////////////////////////////
  //
  // 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;
      }
  };
  
  
  
  
  
  
  CPubKey CWallet::GenerateNewKey()
  {
      AssertLockHeld(cs_wallet); // mapKeyMetadata
      bool fCompressed = CanSupportFeature(FEATURE_COMPRPUBKEY); // default to compressed public keys if we want 0.6.0 wallets
  
      RandAddSeedPerfmon();
      CKey secret;
      secret.MakeNewKey(fCompressed);
  
      // Compressed public keys were introduced in version 0.6.0
      if (fCompressed)
          SetMinVersion(FEATURE_COMPRPUBKEY);
  
      CPubKey pubkey = secret.GetPubKey();
  
      // 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;
      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 = CEycoAddress(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::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;
          };
      }
      return LockKeyStore();
  };
  
  bool CWallet::Unlock(const SecureString& strWalletPassphrase, bool anonymizeOnly)
  {
      SecureString strWalletPassphraseFinal;
  
      if(!IsLocked())
      {
  	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;
  	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;
  }
  
  bool CWallet::EncryptWallet(const SecureString& strWalletPassphrase)
  {
      if (IsCrypted())
          return false;
  
      CKeyingMaterial vMasterKey;
      RandAddSeedPerfmon();
  
      vMasterKey.resize(WALLET_CRYPTO_KEY_SIZE);
      RAND_bytes(&vMasterKey[0], WALLET_CRYPTO_KEY_SIZE);
  
      CMasterKey kMasterKey(nDerivationMethodIndex);
  
      RandAddSeedPerfmon();
      kMasterKey.vchSalt.resize(WALLET_CRYPTO_SALT_SIZE);
      RAND_bytes(&kMasterKey.vchSalt[0], WALLET_CRYPTO_SALT_SIZE);
  
      CCrypter crypter;
      int64_t nStartTime = GetTimeMillis();
      crypter.SetKeyFromPassphrase(strWalletPassphrase, kMasterKey.vchSalt, 25000, kMasterKey.nDerivationMethod);
      kMasterKey.nDeriveIterations = 2500000 / ((double)(GetTimeMillis() - nStartTime));
  
      nStartTime = GetTimeMillis();
      crypter.SetKeyFromPassphrase(strWalletPassphrase, kMasterKey.vchSalt, kMasterKey.nDeriveIterations, kMasterKey.nDerivationMethod);
      kMasterKey.nDeriveIterations = (kMasterKey.nDeriveIterations + kMasterKey.nDeriveIterations * 100 / ((double)(GetTimeMillis() - nStartTime))) / 2;
  
      if (kMasterKey.nDeriveIterations < 25000)
          kMasterKey.nDeriveIterations = 25000;
  
      LogPrintf("Encrypting Wallet with an nDeriveIterations of %i\n", kMasterKey.nDeriveIterations);
  
      if (!crypter.SetKeyFromPassphrase(strWalletPassphrase, kMasterKey.vchSalt, kMasterKey.nDeriveIterations, kMasterKey.nDerivationMethod))
          return false;
      if (!crypter.Encrypt(vMasterKey, kMasterKey.vchCryptedKey))
          return false;
  
      {
          LOCK(cs_wallet);
          mapMasterKeys[++nMasterKeyMaxID] = kMasterKey;
          if (fFileBacked)
          {
              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;
  }
  
  CWallet::TxItems CWallet::OrderedTxItems(std::list<CAccountingEntry>& acentries, std::string strAccount)
  {
      AssertLockHeld(cs_wallet); // mapWallet
      CWalletDB walletdb(strWalletFile);
  
      // First: get all CWalletTx and CAccountingEntry into a sorted-by-order multimap.
      TxItems txOrdered;
  
      // Note: maintaining indices in the database of (account,time) --> txid and (account, time) --> acentry
      // would make this much faster for applications that do this a lot.
      for (map<uint256, CWalletTx>::iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
      {
          CWalletTx* wtx = &((*it).second);
          txOrdered.insert(make_pair(wtx->nOrderPos, TxPair(wtx, (CAccountingEntry*)0)));
      }
      acentries.clear();
      walletdb.ListAccountCreditDebit(strAccount, acentries);
      BOOST_FOREACH(CAccountingEntry& entry, acentries)
      {
          txOrdered.insert(make_pair(entry.nOrderPos, TxPair((CWalletTx*)0, &entry)));
      }
  
      return txOrdered;
  }
  
  void CWallet::WalletUpdateSpent(const CTransaction &tx, bool fBlock)
  {
      // Anytime a signature is successfully verified, it's proof the outpoint is spent.
      // Update the wallet spent flag if it doesn't know due to wallet.dat being
      // restored from backup or the user making copies of wallet.dat.
      {
          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& wtx = (*mi).second;
                  if (txin.prevout.n >= wtx.vout.size())
                      LogPrintf("WalletUpdateSpent: bad wtx %s\n", wtx.GetHash().ToString());
                  else if (!wtx.IsSpent(txin.prevout.n) && IsMine(wtx.vout[txin.prevout.n]))
                  {
                      LogPrintf("WalletUpdateSpent found spent coin %s EYCO %s\n", FormatMoney(wtx.GetCredit()), wtx.GetHash().ToString());
                      wtx.MarkSpent(txin.prevout.n);
                      wtx.WriteToDisk();
                      NotifyTransactionChanged(this, txin.prevout.hash, CT_UPDATED);
                  }
              }
          }
  
          if (fBlock)
          {
              uint256 hash = tx.GetHash();
              map<uint256, CWalletTx>::iterator mi = mapWallet.find(hash);
              CWalletTx& wtx = (*mi).second;
  
              BOOST_FOREACH(const CTxOut& txout, tx.vout)
              {
                  if (IsMine(txout))
                  {
                      wtx.MarkUnspent(&txout - &tx.vout[0]);
                      wtx.WriteToDisk();
                      NotifyTransactionChanged(this, hash, CT_UPDATED);
                  }
              }
          }
  
      }
  }
  
  void CWallet::MarkDirty()
  {
      {
          LOCK(cs_wallet);
          BOOST_FOREACH(PAIRTYPE(const uint256, CWalletTx)& item, mapWallet)
              item.second.MarkDirty();
      }
  }
  
  bool CWallet::AddToWallet(const CWalletTx& wtxIn)
  {
      uint256 hash = wtxIn.GetHash();
      {
          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();
  
              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;
                          std::list<CAccountingEntry> acentries;
                          TxItems txOrdered = OrderedTxItems(acentries);
                          for (TxItems::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;
  
          if (!fHaveGUI) {
              // If default receiving address gets used, replace it with a new one
              if (vchDefaultKey.IsValid()) {
                  CScript scriptDefaultKey;
                  scriptDefaultKey.SetDestination(vchDefaultKey.GetID());
                  BOOST_FOREACH(const CTxOut& txout, wtx.vout)
                  {
                      if (txout.scriptPubKey == scriptDefaultKey)
                      {
                          CPubKey newDefaultKey;
                          if (GetKeyFromPool(newDefaultKey))
                          {
                              SetDefaultKey(newDefaultKey);
                              SetAddressBookName(vchDefaultKey.GetID(), "");
                          }
                      }
                  }
              }
          }
          // since AddToWallet is called directly for self-originating transactions, check for consumption of own coins
          WalletUpdateSpent(wtx, (wtxIn.hashBlock != 0));
  
          // 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);
          }
          else
              WalletUpdateSpent(tx);
      }
      return false;
  }
  
  void CWallet::SyncTransaction(const CTransaction& tx, const CBlock* pblock, bool fConnect) {
      if (!fConnect)
      {
          // wallets need to refund inputs when disconnecting coinstake
          if (tx.IsCoinStake())
          {
              if (IsFromMe(tx))
                  DisableTransaction(tx);
          }
          return;
      }
  
      AddToWalletIfInvolvingMe(tx, pblock, true);
  }
  
  void CWallet::EraseFromWallet(const uint256 &hash)
  {
      if (!fFileBacked)
          return;
      {
          LOCK(cs_wallet);
          if (mapWallet.erase(hash))
              CWalletDB(strWalletFile).EraseTx(hash);
      }
      return;
  }
  
  
  bool 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())
                  if (IsMine(prev.vout[txin.prevout.n]))
                      return true;
          }
      }
      return false;
  }
  
  int64_t CWallet::GetDebit(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())
                  if (IsMine(prev.vout[txin.prevout.n]))
                      return prev.vout[txin.prevout.n].nValue;
          }
      }
      return 0;
  }
  
  
  bool CWallet::IsDenominated(const CTxIn &txin) const
  {
      {
          LOCK(cs_wallet);
          map<uint256, CWalletTx>::const_iterator mi = mapWallet.find(txin.prevout.hash);
          if (mi != mapWallet.end())
          {
              const CWalletTx& prev = (*mi).second;
              if (txin.prevout.n < prev.vout.size()) return IsDenominatedAmount(prev.vout[txin.prevout.n].nValue);
          }
      }
      return false;
  }
  
  bool CWallet::IsDenominatedAmount(int64_t nInputAmount) const
  {
      BOOST_FOREACH(int64_t d, darkSendDenominations)
          if(nInputAmount == d)
              return true;
      return false;
  }
  
  
  bool CWallet::IsChange(const CTxOut& txout) const
  {
      CTxDestination address;
  
      // TODO: fix handling of 'change' outputs. The assumption is that any
      // payment to a TX_PUBKEYHASH that is mine but isn't 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 (ExtractDestination(txout.scriptPubKey, address) && ::IsMine(*this, address))
      {
          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, int64_t& nFee, string& strSentAccount) const
  {
      LOCK(pwallet->cs_wallet);
      nFee = 0;
      listReceived.clear();
      listSent.clear();
      strSentAccount = strFromAccount;
  
      // Compute fee:
      int64_t nDebit = GetDebit();
      if (nDebit > 0) // debit>0 means we signed/sent this transaction
      {
          int64_t nValueOut = GetValueOut();
          nFee = nDebit - nValueOut;
      }
  
      // Sent/received.
      BOOST_FOREACH(const CTxOut& txout, vout)
      {
          // Skip special stake out
          if (txout.scriptPubKey.empty())
              continue;
  
          bool fIsMine;
          // 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
  	    // EYCONOTE: CoinControl possible fix related... with HD wallet we need to report change?
              //if (pwallet->IsChange(txout))
              //    continue;
              fIsMine = pwallet->IsMine(txout);
          }
          else if (!(fIsMine = pwallet->IsMine(txout)))
              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)
              listReceived.push_back(make_pair(address, txout.nValue));
      }
  
  }
  
  void CWalletTx::GetAccountAmounts(const string& strAccount, int64_t& nReceived,
                                    int64_t& nSent, int64_t& nFee) const
  {
      LOCK(pwallet->cs_wallet);
      nReceived = nSent = nFee = 0;
  
      int64_t allFee;
      string strSentAccount;
      list<pair<CTxDestination, int64_t> > listReceived;
      list<pair<CTxDestination, int64_t> > listSent;
      GetAmounts(listReceived, listSent, allFee, strSentAccount);
  
      if (strAccount == strSentAccount)
      {
          BOOST_FOREACH(const PAIRTYPE(CTxDestination,int64_t)& s, listSent)
              nSent += s.second;
          nFee = allFee;
      }
      {
          
          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)
          {
              CWalletTx& wtx = item.second;
              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 EYCO %s\n", FormatMoney(wtx.GetCredit()), 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)
  {
      BOOST_FOREACH(const CMerkleTx& tx, vtxPrev)
      {
          if (!(tx.IsCoinBase() || tx.IsCoinStake()))
          {
              uint256 hash = tx.GetHash();
              if (!txdb.ContainsTx(hash))
                  RelayTransaction((CTransaction)tx, hash);
          }
      }
      if (!(IsCoinBase() || IsCoinStake()))
      {
          uint256 hash = GetHash();
          if (!txdb.ContainsTx(hash))
          {
              LogPrintf("Relaying wtx %s\n", hash.ToString());
              RelayTransaction((CTransaction)*this, hash);
          }
      }
  }
  
  void CWalletTx::RelayWalletTransaction()
  {
     CTxDB txdb("r");
     RelayWalletTransaction(txdb);
  }
  
  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;
              if (wtx.CheckTransaction())
                  wtx.RelayWalletTransaction(txdb);
              else
                  LogPrintf("ResendWalletTransactions() : CheckTransaction failed for transaction %s\n", wtx.GetHash().ToString());
          }
      }
  }
  
  
  
  
  
  
  //////////////////////////////////////////////////////////////////////////////
  //
  // Actions
  //
  
  
  int64_t CWallet::GetBalance() const
  {
      int64_t 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;
  }
  
  int64_t CWallet::GetBalanceNoLocks() const
  {
      int64_t nTotal = 0;
      {
          for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
          {
              const CWalletTx* pcoin = &(*it).second;
              if (pcoin->IsTrusted())
                  nTotal += pcoin->GetAvailableCredit();
          }
      }
  
      return nTotal;
  }
  
  CAmount CWallet::GetAnonymizedBalance() const
  {
      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();
  
                  for (unsigned int i = 0; i < pcoin->vout.size(); i++) {
  		//isminetype mine = IsMine(pcoin->vout[i]);
  		bool mine = IsMine(pcoin->vout[i]);
                      //COutput out = COutput(pcoin, i, nDepth, (mine & ISMINE_SPENDABLE) != ISMINE_NO);
  		COutput out = COutput(pcoin, i, nDepth, mine);
                      CTxIn vin = CTxIn(out.tx->GetHash(), out.i);
  
                      //if(IsSpent(out.tx->GetHash(), i) || !IsMine(pcoin->vout[i]) || !IsDenominated(vin)) continue;	
  		    if(pcoin->IsSpent(i) || !IsMine(pcoin->vout[i]) || !IsDenominated(vin)) continue;
  
                      int rounds = GetInputDarksendRounds(vin);
                      if(rounds >= nDarksendRounds){
                          nTotal += pcoin->vout[i].nValue;
                      }
                  }
              }
          }
      }
  
      return nTotal;
  }
  
  double CWallet::GetAverageAnonymizedRounds() const
  {
      double fTotal = 0;
      double fCount = 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();
  
                  for (unsigned int i = 0; i < pcoin->vout.size(); i++) {
  		//isminetype mine = IsMine(pcoin->vout[i]);
  		    bool mine = IsMine(pcoin->vout[i]);
                      //COutput out = COutput(pcoin, i, nDepth, (mine & ISMINE_SPENDABLE) != ISMINE_NO);
  		    COutput out = COutput(pcoin, i, nDepth, mine);
                      CTxIn vin = CTxIn(out.tx->GetHash(), out.i);
  
                      //if(IsSpent(out.tx->GetHash(), i) || !IsMine(pcoin->vout[i]) || !IsDenominated(vin)) continue;
  		    if(pcoin->IsSpent(i) || !IsMine(pcoin->vout[i]) || !IsDenominated(vin)) continue;
  
                      int rounds = GetInputDarksendRounds(vin);
                      fTotal += (float)rounds;
                      fCount += 1;
                  }
              }
          }
      }
  
      if(fCount == 0) return 0;
  
      return fTotal/fCount;
  }
  
  CAmount CWallet::GetNormalizedAnonymizedBalance() const
  {
      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();
  
                  for (unsigned int i = 0; i < pcoin->vout.size(); i++) {
  		    //isminetype mine = IsMine(pcoin->vout[i]);
  		    bool mine = IsMine(pcoin->vout[i]);
                      //COutput out = COutput(pcoin, i, nDepth, (mine & ISMINE_SPENDABLE) != ISMINE_NO);
  		    COutput out = COutput(pcoin, i, nDepth, mine);
                      CTxIn vin = CTxIn(out.tx->GetHash(), out.i);
  
                      //if(IsSpent(out.tx->GetHash(), i) || !IsMine(pcoin->vout[i]) || !IsDenominated(vin)) continue;
  		    if(pcoin->IsSpent(i) || !IsMine(pcoin->vout[i]) || !IsDenominated(vin)) continue;
  
                      int rounds = GetInputDarksendRounds(vin);
                      nTotal += pcoin->vout[i].nValue * rounds / nDarksendRounds;
                  }
              }
          }
      }
  
      return nTotal;
  }
  
  CAmount CWallet::GetDenominatedBalance(bool onlyDenom, bool onlyUnconfirmed) const
  {
      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;
  
              int nDepth = pcoin->GetDepthInMainChain();
  
              // skip conflicted
              if(nDepth < 0) continue;
  
              bool unconfirmed = (!IsFinalTx(*pcoin) || (!pcoin->IsTrusted() && nDepth == 0));
              if(onlyUnconfirmed != unconfirmed) continue;
  
              for (unsigned int i = 0; i < pcoin->vout.size(); i++)
              {
  				//isminetype mine = IsMine(pcoin->vout[i]);
  		//bool mine = IsMine(pcoin->vout[i]);
                  //COutput out = COutput(pcoin, i, nDepth, (mine & ISMINE_SPENDABLE) != ISMINE_NO);
  		//COutput out = COutput(pcoin, i, nDepth, mine);
  
                  //if(IsSpent(out.tx->GetHash(), i)) continue;
  		if(pcoin->IsSpent(i)) continue;
                  if(!IsMine(pcoin->vout[i])) continue;
                  if(onlyDenom != IsDenominatedAmount(pcoin->vout[i].nValue)) continue;
  
                  nTotal += pcoin->vout[i].nValue;
              }
          }
      }
  
  
  
      return nTotal;
  }
  
  
  int64_t CWallet::GetUnconfirmedBalance() const
  {
      int64_t 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;
  }
  
  int64_t CWallet::GetImmatureBalance() const
  {
      int64_t 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.IsInMainChain())
                  nTotal += GetCredit(pcoin);
          }
      }
      return nTotal;
  }
  
  
  // populate vCoins with vector of spendable 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();
              if (nDepth <= 0) // EYCONOTE: coincontrol fix / ignore 0 confirm 
                  continue;
  
             /* for (unsigned int i = 0; i < pcoin->vout.size(); i++)
                  if (!(pcoin->IsSpent(i)) && IsMine(pcoin->vout[i]) && pcoin->vout[i].nValue >= nMinimumInputValue &&
                  (!coinControl || !coinControl->HasSelected() || coinControl->IsSelected((*it).first, i)))
                      vCoins.push_back(COutput(pcoin, i, nDepth));*/
              // do not use IX for inputs that have less then 6 blockchain confirmations
              if (useIX && nDepth < 6)
                  continue;
  
              for (unsigned int i = 0; i < pcoin->vout.size(); i++) {
                  bool found = false;
                  if(coin_type == ONLY_DENOMINATED) {
                      //should make this a vector
  
                      found = IsDenominatedAmount(pcoin->vout[i].nValue);
                  } else if(coin_type == ONLY_NONDENOMINATED || coin_type == ONLY_NONDENOMINATED_NOTMN) {
                      found = true;
                      if (IsCollateralAmount(pcoin->vout[i].nValue)) continue; // do not use collateral amounts
                      found = !IsDenominatedAmount(pcoin->vout[i].nValue);
                      if(found && coin_type == ONLY_NONDENOMINATED_NOTMN) found = (pcoin->vout[i].nValue != GetMNCollateral(pindexBest->nHeight)*COIN); // do not use MN funds
                  } else {
                      found = true;
                  }
                  if(!found) continue;
  
  				//isminetype mine = IsMine(pcoin->vout[i]);
  		bool mine = IsMine(pcoin->vout[i]);
  
                  //if (!(IsSpent(wtxid, 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));
  		//if (!(IsSpent(wtxid, i)) && mine &&
  		if (!(pcoin->IsSpent(i)) && mine &&
                      !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));
              }
          }
      }
  }
  
  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) // EYCONOTE: coincontrol fix / ignore 0 confirm 
                  continue;
  
             /* for (unsigned int i = 0; i < pcoin->vout.size(); i++)
                  if (!(pcoin->IsSpent(i)) && IsMine(pcoin->vout[i]) && pcoin->vout[i].nValue >= nMinimumInputValue &&
                  (!coinControl || !coinControl->HasSelected() || coinControl->IsSelected((*it).first, i)))
                      vCoins.push_back(COutput(pcoin, i, nDepth));*/
              // do not use IX for inputs that have less then 6 blockchain confirmations
              if (useIX && nDepth < 6)
                  continue;
  
              for (unsigned int i = 0; i < pcoin->vout.size(); i++) {
                  bool found = false;
                  if(coin_type == ONLY_DENOMINATED) {
                      //should make this a vector
  
                      found = IsDenominatedAmount(pcoin->vout[i].nValue);
                  } else if(coin_type == ONLY_NONDENOMINATED || coin_type == ONLY_NONDENOMINATED_NOTMN) {
                      found = true;
                      if (IsCollateralAmount(pcoin->vout[i].nValue)) continue; // do not use collateral amounts
                      found = !IsDenominatedAmount(pcoin->vout[i].nValue);
                      if(found && coin_type == ONLY_NONDENOMINATED_NOTMN) found = (pcoin->vout[i].nValue != GetMNCollateral(pindexBest->nHeight)*COIN); // do not use MN funds
                  } else {
                      found = true;
                  }
                  if(!found) continue;
  
  				//isminetype mine = IsMine(pcoin->vout[i]);
  		bool mine = IsMine(pcoin->vout[i]);
  
                  //if (!(IsSpent(wtxid, 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));
  		//if (!(IsSpent(wtxid, i)) && mine &&
  		if (!(pcoin->IsSpent(i)) &&
                      !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));
              }
          }
      }
  }
  
  void CWallet::AvailableCoinsForStaking(vector<COutput>& vCoins, unsigned int nSpendTime) const
  {
      vCoins.clear();
  
      {
          LOCK2(cs_main, cs_wallet);
          int nStakeMinConfirmations = 66;
          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;
  
  
              nStakeMinConfirmations = 66;
  
  
              if (nDepth < nStakeMinConfirmations)
              {
                  continue;
              }    
              else
              {
              // Filtering by tx timestamp instead of block timestamp may give false positives but never false negatives
              if (pcoin->nTime + nStakeMinAge > nSpendTime)
                 continue;
              }
              
              if (pcoin->GetBlocksToMaturity() > 0)
                  continue;
  
              for (unsigned int i = 0; i < pcoin->vout.size(); i++)
                  if (!(pcoin->IsSpent(i)) && IsMine(pcoin->vout[i]) && pcoin->vout[i].nValue >= nMinimumInputValue)
                      vCoins.push_back(COutput(pcoin, i, nDepth, true));
          }
      }
  }
  
  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;
                      }
                  }
              }
          }
      }
  }
  
  // ppcoin: total coins staked (non-spendable until maturity)
  int64_t CWallet::GetStake() const
  {
      int64_t 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);
      }
      return nTotal;
  }
  
  int64_t CWallet::GetNewMint() const
  {
      int64_t 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);
      }
      return nTotal;
  }
  
  struct LargerOrEqualThanThreshold
  {
      int64_t threshold;
      LargerOrEqualThanThreshold(int64_t threshold) : threshold(threshold) {}
      bool operator()(pair<pair<int64_t,int64_t>,pair<const CWalletTx*,unsigned int> > const &v) const { return v.first.first >= threshold; }
  };
  
  bool CWallet::SelectCoinsMinConfByCoinAge(int64_t nTargetValue, unsigned int nSpendTime, int nConfMine, int nConfTheirs, std::vector<COutput> vCoins, set<pair<const CWalletTx*,unsigned int> >& setCoinsRet, int64_t& nValueRet) const
  {
      setCoinsRet.clear();
      nValueRet = 0;
  
      vector<pair<COutput, uint64_t> > mCoins;
      BOOST_FOREACH(const COutput& out, vCoins)
      {
          mCoins.push_back(std::make_pair(out, CoinWeightCost(out)));
      }
  
      // List of values less than target
      pair<pair<int64_t,int64_t>, pair<const CWalletTx*,unsigned int> > coinLowestLarger;
      coinLowestLarger.first.second = std::numeric_limits<int64_t>::max();
      coinLowestLarger.second.first = NULL;
      vector<pair<pair<int64_t,int64_t>,pair<const CWalletTx*,unsigned int> > > vValue;
      int64_t nTotalLower = 0;
      boost::sort(mCoins, boost::bind(&std::pair<COutput, uint64_t>::second, _1) < boost::bind(&std::pair<COutput, uint64_t>::second, _2));
  
      BOOST_FOREACH(const PAIRTYPE(COutput, uint64_t)& output, mCoins)
      {
          const CWalletTx *pcoin = output.first.tx;
  
          if (output.first.nDepth < (pcoin->IsFromMe() ? nConfMine : nConfTheirs))
              continue;
  
          int i = output.first.i;
  
          // Follow the timestamp rules
          if (pcoin->nTime > nSpendTime)
              continue;
  
          int64_t n = pcoin->vout[i].nValue;
  
          pair<pair<int64_t,int64_t>,pair<const CWalletTx*,unsigned int> > coin = make_pair(make_pair(n,output.second),make_pair(pcoin, i));
  
          if (n < nTargetValue + CENT)
          {
              vValue.push_back(coin);
              nTotalLower += n;
          }
          else if (output.second < (uint64_t)coinLowestLarger.first.second)
          {
              coinLowestLarger = coin;
          }
      }
  
      if (nTotalLower < nTargetValue)
      {
          if (coinLowestLarger.second.first == NULL)
              return false;
          setCoinsRet.insert(coinLowestLarger.second);
          nValueRet += coinLowestLarger.first.first;
          return true;
      }
  
      // Calculate dynamic programming matrix
      int64_t nTotalValue = vValue[0].first.first;
      int64_t nGCD = vValue[0].first.first;
      for (unsigned int i = 1; i < vValue.size(); ++i)
      {
          nGCD = gcd(vValue[i].first.first, nGCD);
          nTotalValue += vValue[i].first.first;
      }
      nGCD = gcd(nTargetValue, nGCD);
      int64_t denom = nGCD;
      const int64_t k = 25;
      const int64_t approx = int64_t(vValue.size() * (nTotalValue - nTargetValue)) / k;
      if (approx > nGCD)
      {
          denom = approx; // apply approximation
      }
      if (fDebug) cerr << "nGCD " << nGCD << " denom " << denom << " k " << k << endl;
  
      if (nTotalValue == nTargetValue)
      {
          for (unsigned int i = 0; i < vValue.size(); ++i)
          {
              setCoinsRet.insert(vValue[i].second);
          }
          nValueRet = nTotalValue;
          return true;
      }
  
      size_t nBeginBundles = vValue.size();
      size_t nTotalCoinValues = vValue.size();
      size_t nBeginCoinValues = 0;
      int64_t costsum = 0;
      vector<vector<pair<pair<int64_t,int64_t>,pair<const CWalletTx*,unsigned int> > >::iterator> vZeroValueBundles;
      if (denom != nGCD)
      {
          // All coin outputs that with zero value will always be added by the dynamic programming routine
          // So we collect them into bundles of value denom
          vector<pair<pair<int64_t,int64_t>,pair<const CWalletTx*,unsigned int> > >::iterator itZeroValue = std::stable_partition(vValue.begin(), vValue.end(), LargerOrEqualThanThreshold(denom));
          vZeroValueBundles.push_back(itZeroValue);
          pair<int64_t, int64_t> pBundle = make_pair(0, 0);
          nBeginBundles = itZeroValue - vValue.begin();
          nTotalCoinValues = nBeginBundles;
          while (itZeroValue != vValue.end())
          {
              pBundle.first += itZeroValue->first.first;
              pBundle.second += itZeroValue->first.second;
              itZeroValue++;
              if (pBundle.first >= denom)
              {
                  vZeroValueBundles.push_back(itZeroValue);
                  vValue[nTotalCoinValues].first = pBundle;
                  pBundle = make_pair(0, 0);
                  nTotalCoinValues++;
              }
          }
          // We need to recalculate the total coin value due to truncation of integer division
          nTotalValue = 0;
          for (unsigned int i = 0; i < nTotalCoinValues; ++i)
          {
              nTotalValue += vValue[i].first.first / denom;
          }
          // Check if dynamic programming is still applicable with the approximation
          if (nTargetValue/denom >= nTotalValue)
          {
              // We lose too much coin value through the approximation, i.e. the residual of the previous recalculation is too large
              // Since the partitioning of the previously sorted list is stable, we can just pick the first coin outputs in the list until we have a valid target value
              for (; nBeginCoinValues < nTotalCoinValues && (nTargetValue - nValueRet)/denom >= nTotalValue; ++nBeginCoinValues)
              {
                  if (nBeginCoinValues >= nBeginBundles)
                  {
                      if (fDebug) cerr << "prepick bundle item " << FormatMoney(vValue[nBeginCoinValues].first.first) << " normalized " << vValue[nBeginCoinValues].first.first / denom << " cost " << vValue[nBeginCoinValues].first.second << endl;
                      const size_t nBundle = nBeginCoinValues - nBeginBundles;
                      for (vector<pair<pair<int64_t,int64_t>,pair<const CWalletTx*,unsigned int> > >::iterator it = vZeroValueBundles[nBundle]; it != vZeroValueBundles[nBundle + 1]; ++it)
                      {
                          setCoinsRet.insert(it->second);
                      }
                  }
                  else
                  {
                      if (fDebug) cerr << "prepicking " << FormatMoney(vValue[nBeginCoinValues].first.first) << " normalized " << vValue[nBeginCoinValues].first.first / denom << " cost " << vValue[nBeginCoinValues].first.second << endl;
                      setCoinsRet.insert(vValue[nBeginCoinValues].second);
                  }
                  nTotalValue -= vValue[nBeginCoinValues].first.first / denom;
                  nValueRet += vValue[nBeginCoinValues].first.first;
                  costsum += vValue[nBeginCoinValues].first.second;
              }
              if (nValueRet >= nTargetValue)
              {
                      if (fDebug) cerr << "Done without dynprog: " << "requested " << FormatMoney(nTargetValue) << "\tnormalized " << nTargetValue/denom + (nTargetValue % denom != 0 ? 1 : 0) << "\tgot " << FormatMoney(nValueRet) << "\tcost " << costsum << endl;
                      return true;
              }
          }
      }
      else
      {
          nTotalValue /= denom;
      }
  
      uint64_t nAppend = 1;
      if ((nTargetValue - nValueRet) % denom != 0)
      {
          // We need to decrease the capacity because of integer truncation
          nAppend--;
      }
  
      // The capacity (number of columns) corresponds to the amount of coin value we are allowed to discard
      boost::numeric::ublas::matrix<uint64_t> M((nTotalCoinValues - nBeginCoinValues) + 1, (nTotalValue - (nTargetValue - nValueRet)/denom) + nAppend, std::numeric_limits<int64_t>::max());
      boost::numeric::ublas::matrix<unsigned int> B((nTotalCoinValues - nBeginCoinValues) + 1, (nTotalValue - (nTargetValue - nValueRet)/denom) + nAppend);
      for (unsigned int j = 0; j < M.size2(); ++j)
      {
          M(0,j) = 0;
      }
      for (unsigned int i = 1; i < M.size1(); ++i)
      {
          uint64_t nWeight = vValue[nBeginCoinValues + i - 1].first.first / denom;
          uint64_t nValue = vValue[nBeginCoinValues + i - 1].first.second;
          //cerr << "Weight " << nWeight << " Value " << nValue << endl;
          for (unsigned int j = 0; j < M.size2(); ++j)
          {
              B(i, j) = j;
              if (nWeight <= j)
              {
                  uint64_t nStep = M(i - 1, j - nWeight) + nValue;
                  if (M(i - 1, j) >= nStep)
                  {
                      M(i, j) = M(i - 1, j);
                  }
                  else
                  {
                      M(i, j) = nStep;
                      B(i, j) = j - nWeight;
                  }
              }
              else
              {
                  M(i, j) = M(i - 1, j);
              }
          }
      }
      // Trace back optimal solution
      int64_t nPrev = M.size2() - 1;
      for (unsigned int i = M.size1() - 1; i > 0; --i)
      {
          //cerr << i - 1 << " " << vValue[i - 1].second.second << " " << vValue[i - 1].first.first << " " << vValue[i - 1].first.second << " " << nTargetValue << " " << nPrev << " " << (nPrev == B(i, nPrev) ? "XXXXXXXXXXXXXXX" : "") << endl;
          if (nPrev == B(i, nPrev))
          {
              const size_t nValue = nBeginCoinValues + i - 1;
              // Check if this is a bundle
              if (nValue >= nBeginBundles)
              {
                  if (fDebug) cerr << "pick bundle item " << FormatMoney(vValue[nValue].first.first) << " normalized " << vValue[nValue].first.first / denom << " cost " << vValue[nValue].first.second << endl;
                  const size_t nBundle = nValue - nBeginBundles;
                  for (vector<pair<pair<int64_t,int64_t>,pair<const CWalletTx*,unsigned int> > >::iterator it = vZeroValueBundles[nBundle]; it != vZeroValueBundles[nBundle + 1]; ++it)
                  {
                      setCoinsRet.insert(it->second);
                  }
              }
              else
              {
                  if (fDebug) cerr << "pick " << nValue << " value " << FormatMoney(vValue[nValue].first.first) << " normalized " << vValue[nValue].first.first / denom << " cost " << vValue[nValue].first.second << endl;
                  setCoinsRet.insert(vValue[nValue].second);
              }
              nValueRet += vValue[nValue].first.first;
              costsum += vValue[nValue].first.second;
          }
          nPrev = B(i, nPrev);
      }
      if (nValueRet < nTargetValue && !vZeroValueBundles.empty())
      {
          // If we get here it means that there are either not sufficient funds to pay the transaction or that there are small coin outputs left that couldn't be bundled
          // We try to fulfill the request by adding these small coin outputs
          for (vector<pair<pair<int64_t,int64_t>,pair<const CWalletTx*,unsigned int> > >::iterator it = vZeroValueBundles.back(); it != vValue.end() && nValueRet < nTargetValue; ++it)
          {
               setCoinsRet.insert(it->second);
               nValueRet += it->first.first;
          }
      }
      if (fDebug) cerr << "requested " << FormatMoney(nTargetValue) << "\tnormalized " << nTargetValue/denom + (nTargetValue % denom != 0 ? 1 : 0) << "\tgot " << FormatMoney(nValueRet) << "\tcost " << costsum << endl;
      if (fDebug) cerr << "M " << M.size1() << "x" << M.size2() << "; vValue.size() = " << vValue.size() << endl;
      return true;
  }
  
  // TODO: find appropriate place for this sort function
  // move denoms down
  bool less_then_denom (const COutput& out1, const COutput& out2)
  {
      const CWalletTx *pcoin1 = out1.tx;
      const CWalletTx *pcoin2 = out2.tx;
  
      bool found1 = false;
      bool found2 = false;
      BOOST_FOREACH(int64_t d, darkSendDenominations) // loop through predefined denoms
      {
          if(pcoin1->vout[out1.i].nValue == d) found1 = true;
          if(pcoin2->vout[out2.i].nValue == d) found2 = true;
      }
      return (!found1 && found2);
  }
  
  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);
  
      // move denoms down on the list
      sort(vCoins.begin(), vCoins.end(), less_then_denom);
  
      // try to find nondenom first to prevent unneeded spending of mixed coins
      for (unsigned int tryDenom = 0; tryDenom < 2; tryDenom++)
      {
          if (fDebug) LogPrint("selectcoins", "tryDenom: %d\n", tryDenom);
          vValue.clear();
          nTotalLower = 0;
  
      BOOST_FOREACH(COutput output, vCoins)
      {
          const CWalletTx *pcoin = output.tx;
  
          if (output.nDepth < (pcoin->IsFromMe() ? nConfMine : nConfTheirs))
              continue;
  
          int i = output.i;
  
          // Follow the timestamp rules
          if (pcoin->nTime > nSpendTime)
              continue;
  
          int64_t n = pcoin->vout[i].nValue;
  
          if (tryDenom == 0 && IsDenominatedAmount(n)) continue; // we don't want denom values on first run
  
          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;
      }
      return false;
  }
  
  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);
  
      //if we're doing only denominated, we need to round up to the nearest .1EYCO
      if(coin_type == ONLY_DENOMINATED){
          // Make outputs by looping through denominations, from large to small
          BOOST_FOREACH(int64_t v, darkSendDenominations)
          {
              int added = 0;
              BOOST_FOREACH(const COutput& out, vCoins)
              {
                  if(out.tx->vout[out.i].nValue == v                                            //make sure it's the denom we're looking for
                      && nValueRet + out.tx->vout[out.i].nValue < nTargetValue + (0.1*COIN)+100 //round the amount up to .1EYCO over
                      && added <= 100){                                                          //don't add more than 100 of one denom type
                          CTxIn vin = CTxIn(out.tx->GetHash(),out.i);
                          int rounds = GetInputDarksendRounds(vin);
                          // make sure it's actually anonymized
                          if(rounds < nDarksendRounds) continue;
                          nValueRet += out.tx->vout[out.i].nValue;
                          setCoinsRet.insert(make_pair(out.tx, out.i));
                          added++;
                  }
              }
          }
          return (nValueRet >= nTargetValue);
      }
  
      // 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 = fMinimizeCoinAge ? &CWallet::SelectCoinsMinConfByCoinAge : &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)
      {
          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::SelectCoinsByDenominations(int nDenom, int64_t nValueMin, int64_t nValueMax, std::vector<CTxIn>& setCoinsRet, vector<COutput>& setCoinsRet2, int64_t& nValueRet, int nDarksendRoundsMin, int nDarksendRoundsMax)
  {
      setCoinsRet.clear();
      nValueRet = 0;
  
      setCoinsRet2.clear();
      vector<COutput> vCoins;
      AvailableCoins(vCoins);
  
      //order the array so fees are first, then denominated money, then the rest.
      std::random_shuffle(vCoins.rbegin(), vCoins.rend());
  
      //keep track of each denomination that we have
      bool fFound100000 = false;
      bool fFound10000 = false;
      bool fFound1000 = false;
      bool fFound100 = false;
      bool fFound10 = false;
      bool fFound1 = false;
      bool fFoundDot1 = false;
  
      //Check to see if any of the denomination are off, in that case mark them as fulfilled
  
  
  
      if(!(nDenom & (1 << 0))) fFound100000 = true;
      if(!(nDenom & (1 << 1))) fFound10000 = true;
      if(!(nDenom & (1 << 2))) fFound1000 = true;
      if(!(nDenom & (1 << 3))) fFound100 = true;
      if(!(nDenom & (1 << 4))) fFound10 = true;
      if(!(nDenom & (1 << 5))) fFound1 = true;
      if(!(nDenom & (1 << 6))) fFoundDot1 = true;
  
      BOOST_FOREACH(const COutput& out, vCoins)
      {
          //there's no reason to allow inputs less than 1 COIN into DS (other than denominations smaller than that amount)
          if(out.tx->vout[out.i].nValue < 1*COIN && out.tx->vout[out.i].nValue != (.1*COIN)+100) continue;
          if(fMasterNode && out.tx->vout[out.i].nValue == GetMNCollateral(pindexBest->nHeight)*COIN) continue; //masternode input
          if(nValueRet + out.tx->vout[out.i].nValue <= nValueMax){
              bool fAccepted = false;
  
              // Function returns as follows:
              //
              // bit 0 - 100EYCO+1 ( bit on if present )
              // bit 1 - 10EYCO+1
              // bit 2 - 1EYCO+1
              // bit 3 - .1EYCO+1
  
              CTxIn vin = CTxIn(out.tx->GetHash(),out.i);
  
              int rounds = GetInputDarksendRounds(vin);
              if(rounds >= nDarksendRoundsMax) continue;
              if(rounds < nDarksendRoundsMin) continue;
  
              if(fFound100000 && fFound10000 && fFound1000 && fFound100 && fFound10 && fFound1 && fFoundDot1){ //if fulfilled
                  //we can return this for submission
                  if(nValueRet >= nValueMin){
                      //random reduce the max amount we'll submit for anonymity
                      nValueMax -= (rand() % (nValueMax/5));
                      //on average use 50% of the inputs or less
                      int r = (rand() % (int)vCoins.size());
                      if((int)setCoinsRet.size() > r) return true;
                  }
                  //Denomination criterion has been met, we can take any matching denominations
                  if((nDenom & (1 << 0)) && out.tx->vout[out.i].nValue ==      ((100000*COIN)    +100000000)) {fAccepted = true;}
                  else if((nDenom & (1 << 1)) && out.tx->vout[out.i].nValue == ((10000*COIN)     +10000000)) {fAccepted = true;}
                  else if((nDenom & (1 << 2)) && out.tx->vout[out.i].nValue == ((1000*COIN)      +1000000)) {fAccepted = true;}
                  else if((nDenom & (1 << 3)) && out.tx->vout[out.i].nValue == ((100*COIN)       +100000)) {fAccepted = true;}
                  else if((nDenom & (1 << 4)) && out.tx->vout[out.i].nValue == ((10*COIN)        +10000)) {fAccepted = true;}
                  else if((nDenom & (1 << 5)) && out.tx->vout[out.i].nValue == ((1*COIN)         +1000)) {fAccepted = true;}
                  else if((nDenom & (1 << 6)) && out.tx->vout[out.i].nValue == ((.1*COIN)        +100)) {fAccepted = true;}
              } else {
                  //Criterion has not been satisfied, we will only take 1 of each until it is.
                  if((nDenom & (1 << 0)) && out.tx->vout[out.i].nValue ==      ((100000*COIN)    +100000000)) {fAccepted = true; fFound100000 = true;}
                  else if((nDenom & (1 << 1)) && out.tx->vout[out.i].nValue == ((10000*COIN)     +10000000)) {fAccepted = true; fFound10000 = true;}
                  else if((nDenom & (1 << 1)) && out.tx->vout[out.i].nValue == ((1000*COIN)      +1000000)) {fAccepted = true; fFound1000 = true;}
                  else if((nDenom & (1 << 1)) && out.tx->vout[out.i].nValue == ((100*COIN)       +100000)) {fAccepted = true; fFound100 = true;}
                  else if((nDenom & (1 << 1)) && out.tx->vout[out.i].nValue == ((10*COIN)        +10000)) {fAccepted = true; fFound10 = true;}
                  else if((nDenom & (1 << 2)) && out.tx->vout[out.i].nValue == ((1*COIN)         +1000)) {fAccepted = true; fFound1 = true;}
                  else if((nDenom & (1 << 3)) && out.tx->vout[out.i].nValue == ((.1*COIN)        +100)) {fAccepted = true; fFoundDot1 = true;}
              }
              if(!fAccepted) continue;
  
              vin.prevPubKey = out.tx->vout[out.i].scriptPubKey; // the inputs PubKey
              nValueRet += out.tx->vout[out.i].nValue;
              setCoinsRet.push_back(vin);
              setCoinsRet2.push_back(out);
          }
      }
  
      return (nValueRet >= nValueMin && fFound100000 && fFound10000 && fFound1000 && fFound100 && fFound10 && fFound1 && fFoundDot1);
  }
  
  bool CWallet::SelectCoinsDark(int64_t nValueMin, int64_t nValueMax, std::vector<CTxIn>& setCoinsRet, int64_t& nValueRet, int nDarksendRoundsMin, int nDarksendRoundsMax) const
  {
      CCoinControl *coinControl=NULL;
  
      setCoinsRet.clear();
      nValueRet = 0;
  
      vector<COutput> vCoins;
      AvailableCoins(vCoins, true, coinControl, nDarksendRoundsMin < 0 ? ONLY_NONDENOMINATED_NOTMN : ONLY_DENOMINATED);
  
      set<pair<const CWalletTx*,unsigned int> > setCoinsRet2;
  
      //order the array so fees are first, then denominated money, then the rest.
      sort(vCoins.rbegin(), vCoins.rend(), CompareByPriority());
  
      //the first thing we get is a fee input, then we'll use as many denominated as possible. then the rest
      BOOST_FOREACH(const COutput& out, vCoins)
      {
          //there's no reason to allow inputs less than 1 COIN into DS (other than denominations smaller than that amount)
          if(out.tx->vout[out.i].nValue < 1*COIN && out.tx->vout[out.i].nValue != (.1*COIN)+100) continue;
          if(fMasterNode && out.tx->vout[out.i].nValue == GetMNCollateral(pindexBest->nHeight)*COIN) continue; //masternode input
  
          if(nValueRet + out.tx->vout[out.i].nValue <= nValueMax){
              CTxIn vin = CTxIn(out.tx->GetHash(),out.i);
  
              int rounds = GetInputDarksendRounds(vin);
              if(rounds >= nDarksendRoundsMax) continue;
              if(rounds < nDarksendRoundsMin) continue;
  
              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));
          }
      }
  
      // if it's more than min, we're good to return
      if(nValueRet >= nValueMin) return true;
  
      return false;
  }
  
  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();
  
                  for (unsigned int i = 0; i < pcoin->vout.size(); i++) {
  					//isminetype mine = IsMine(pcoin->vout[i]);
  		    bool mine = IsMine(pcoin->vout[i]);
                      //COutput out = COutput(pcoin, i, nDepth, (mine & ISMINE_SPENDABLE) != ISMINE_NO);
  		    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(!IsDenominatedAmount(pcoin->vout[i].nValue)) continue;
                      //if(IsSpent(out.tx->GetHash(), i) || !IsMine(pcoin->vout[i]) || !IsDenominated(vin)) continue;
  		    if(pcoin->IsSpent(i) || !IsMine(pcoin->vout[i]) || !IsDenominated(vin)) continue;
  
                      nTotal++;
                  }
              }
          }
      }
  
      return nTotal;
  }
  
  bool CWallet::HasCollateralInputs() const
  {
      vector<COutput> vCoins;
      AvailableCoins(vCoins);
  
      int nFound = 0;
      BOOST_FOREACH(const COutput& out, vCoins)
          if(IsCollateralAmount(out.tx->vout[out.i].nValue)) nFound++;
  
      return nFound > 1; // should have more than one just in case
  }
  
  bool CWallet::IsCollateralAmount(int64_t nInputAmount) const
  {
      return  nInputAmount == (DARKSEND_COLLATERAL * 5)+DARKSEND_FEE ||
              nInputAmount == (DARKSEND_COLLATERAL * 4)+DARKSEND_FEE ||
              nInputAmount == (DARKSEND_COLLATERAL * 3)+DARKSEND_FEE ||
              nInputAmount == (DARKSEND_COLLATERAL * 2)+DARKSEND_FEE ||
              nInputAmount == (DARKSEND_COLLATERAL * 1)+DARKSEND_FEE;
  }
  
  bool CWallet::SelectCoinsWithoutDenomination(int64_t nTargetValue, set<pair<const CWalletTx*,unsigned int> >& setCoinsRet, int64_t& nValueRet) const
  {
      CCoinControl *coinControl=NULL;
  
      vector<COutput> vCoins;
      AvailableCoins(vCoins, true, coinControl, ONLY_NONDENOMINATED);
  
      BOOST_FOREACH(const COutput& out, vCoins)
      {
          nValueRet += out.tx->vout[out.i].nValue;
          setCoinsRet.insert(make_pair(out.tx, out.i));
      }
      return (nValueRet >= nTargetValue);
  }
  
  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.
      */
      int64_t nFeeRet = 0.001*COIN;
  
      txCollateral.vin.clear();
      txCollateral.vout.clear();
  
      CReserveKey reservekey(this);
      int64_t nValueIn2 = 0;
      std::vector<CTxIn> vCoinsCollateral;
  
      if (!SelectCoinsCollateral(vCoinsCollateral, nValueIn2))
      {
          strReason = "Error: Darksend 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 - DARKSEND_COLLATERAL - nFeeRet > 0) {
          //pay collateral charge in fees
          CTxOut vout3 = CTxOut(nValueIn2 - DARKSEND_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 = "CDarkSendPool::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::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)
              return false;
          nValue += s.second;
      }
      if (vecSend.empty() || nValue < 0)
          return false;
  
      wtxNew.BindWallet(this);
      CTransaction txNew;
  
      // Discourage fee sniping.
      //
      // However because of a off-by-one-error in previous versions we need to
      // neuter it by setting nLockTime to at least one less than nBestHeight.
      // Secondly currently propagation of transactions created for block heights
      // corresponding to blocks that were just mined may be iffy - transactions
      // aren't re-accepted into the mempool - we additionally neuter the code by
      // going ten blocks back. Doesn't yet do anything for sniping, but does act
      // to shake out wallet bugs like not showing nLockTime'd transactions at
      // all.
      wtxNew.nLockTime = std::max(0, nBestHeight - 10);
  
      // Secondly occasionally randomly pick a nLockTime even further back, so
      // that transactions that are delayed after signing for whatever reason,
      // e.g. high-latency mix networks and some CoinJoin implementations, have
      // better privacy.
      if (GetRandInt(10) == 0)
          wtxNew.nLockTime = std::max(0, (int)wtxNew.nLockTime - GetRandInt(100));
  
      assert(wtxNew.nLockTime <= (unsigned int)nBestHeight);
      assert(wtxNew.nLockTime < LOCKTIME_THRESHOLD);
  
      {
          LOCK2(cs_main, cs_wallet);
          // txdb must be opened before the mapWallet lock
          CTxDB txdb("r");
          {
              nFeeRet = nTransactionFee;
              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)
                      wtxNew.vout.push_back(CTxOut(s.second, s.first));
  
                  // Choose coins to use
                  set<pair<const CWalletTx*,unsigned int> > setCoins;
                  int64_t nValueIn = 0;
                  if (!SelectCoins(nTotalValue, wtxNew.nTime, setCoins, nValueIn, coinControl))
                  {
                      if(coin_type == ALL_COINS) {
                          strFailReason = _("Insufficient funds.");
                      } else if (coin_type == ONLY_NONDENOMINATED) {
                          strFailReason = _("Unable to locate enough Darksend non-denominated funds for this transaction.");
                      } else if (coin_type == ONLY_NONDENOMINATED_NOTMN) {
                          strFailReason = _("Unable to locate enough Darksend non-denominated funds for this transaction that are not equal 1000 EYCO.");
                      } else {
                          strFailReason = _("Unable to locate enough Darksend denominated funds for this transaction.");
                          strFailReason += _("Darksend uses exact denominated amounts to send funds, you might simply need to anonymize some more coins.");
                      }
  
                      if(useIX){
                          strFailReason += _("InstantX requires inputs with at least 6 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;
                      dPriority += (double)nCredit * pcoin.first->GetDepthInMainChain();
                  }
  
                  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-eyco-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;
                          assert(reservekey.GetReservedKey(vchPubKey)); // should never fail, as we just unlocked
  
                          scriptChange.SetDestination(vchPubKey.GetID());
                      }
  
                      // Insert change txn at random position:
                      vector<CTxOut>::iterator position = wtxNew.vout.begin()+GetRandInt(wtxNew.vout.size()+1);
  
  		    // Don't put change output between value and narration outputs
                      if (position > wtxNew.vout.begin() && position < wtxNew.vout.end())
                      {
                          while (position > wtxNew.vout.begin())
                          {
                              if (position->nValue != 0)
                                  break;
                              position--;
                          };
                      };
  
                      wtxNew.vout.insert(position, CTxOut(nChange, scriptChange));
  		    nChangePos = std::distance(wtxNew.vout.begin(), position);
                  }
                  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,CScript(),
                                                std::numeric_limits<unsigned int>::max()-1));
  
                  // Sign
                  int nIn = 0;
                  BOOST_FOREACH(const PAIRTYPE(const CWalletTx*,unsigned int)& coin, setCoins)
                      if (!SignSignature(*this, *coin.first, wtxNew, nIn++))
                          return false;
  
                  // Limit size
                  unsigned int nBytes = ::GetSerializeSize(*(CTransaction*)&wtxNew, SER_NETWORK, PROTOCOL_VERSION);
                  if (nBytes >= MAX_STANDARD_TX_SIZE)
                      return false;
                  dPriority /= nBytes;
  
                  // Check that enough fee is included
                  int64_t nPayFee = nTransactionFee * (1 + (int64_t)nBytes / 1000);
                  int64_t nMinFee = GetMinFee(wtxNew, 1, GMF_SEND, nBytes);
  
                  if (nFeeRet < max(nPayFee, nMinFee))
                  {
                      nFeeRet = max(nPayFee, nMinFee);
                      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);
      
      // -- 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();
          CEycoAddress 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();
              CEycoAddress 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, 1));
      
      // -- 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);
      
      // -- 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  ");
          printf("SendStealthMoney() : %s", strError.c_str());
          return strError;
      }
      if (fWalletUnlockStakingOnly)
      {
          string strError = _("Error: Wallet unlocked for staking only, unable to create transaction.");
          printf("SendStealthMoney() : %s", 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 = _("Error: Transaction creation failed  ");
          printf("SendStealthMoney() : %s", 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();
      
      CEycoAddress addrTo(ckidTo);
      
      if (SecretToPublicKey(ephem_secret, ephem_pubkey) != 0)
      {
          sError = "Could not generate ephem public key.";
          return false;
      };
      
      if (fDebug)
      {
          printf("Stealth send to generated pubkey %"PRIszu": %s\n", pkSendTo.size(), HexStr(pkSendTo).c_str());
          printf("hash %s\n", addrTo.ToString().c_str());
          printf("ephem_pubkey %"PRIszu": %s\n", ephem_pubkey.size(), HexStr(ephem_pubkey).c_str());
      };
      
      std::vector<unsigned char> vchNarr;
      if (sNarr.length() > 0)
      {
          SecMsgCrypter crypter;
          crypter.SetKey(&secretShared.e[0], &ephem_pubkey[0]);
          
          if (!crypter.Encrypt((uint8_t*)&sNarr[0], sNarr.length(), vchNarr))
          {
              sError = "Narration encryption failed.";
              return false;
          };
          
          if (vchNarr.size() > 48)
          {
              sError = "Encrypted narration is too long.";
              return false;
          };
      };
      
      // -- Parse Eyco 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();
                      CEycoAddress 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)
                      {
                          CEycoAddress 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++;
                  };
                  
                  if (txout.scriptPubKey.GetOp(itTxA, opCode, vchENarr)
                      && opCode == OP_RETURN
                      && txout.scriptPubKey.GetOp(itTxA, opCode, vchENarr)
                      && vchENarr.size() > 0)
                  {
                      SecMsgCrypter crypter;
                      crypter.SetKey(&sShared.e[0], &vchEphemPK[0]);
                      std::vector<uint8_t> vchNarr;
                      if (!crypter.Decrypt(&vchENarr[0], vchENarr.size(), vchNarr))
                      {
                          printf("Decrypt narration failed.\n");
                          continue;
                      };
                      std::string sNarr = std::string(vchNarr.begin(), vchNarr.end());
                      
                      snprintf(cbuf, sizeof(cbuf), "n_%d", nOutputId);
                      mapNarr[cbuf] = sNarr;
                  };
                  
                  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;
  
      int64_t nCurrentTime = GetTime();
      CTxDB txdb("r");
  
      LOCK2(cs_main, cs_wallet);
      int nStakeMinConfirmations = 66;
  
      nStakeMinConfirmations = 66;
  
  
      BOOST_FOREACH(PAIRTYPE(const CWalletTx*, unsigned int) pcoin, setCoins)
      {
          CTxIndex txindex;
          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();
  
      // 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;
      }
  
      // Masternode Payments
      int payments = 1;
      // start masternode payments
      bool bMasterNodePayment = true; // note was false, set true to test
  
      if ( Params().NetworkID() == CChainParams::TESTNET ){
          if (GetTime() > START_MASTERNODE_PAYMENTS_TESTNET ){
              bMasterNodePayment = true;
          }
      }else{
          if (GetTime() > START_MASTERNODE_PAYMENTS){
              bMasterNodePayment = true;
          }
      }
  
      CScript payee;
      bool hasPayment = true;
      if(bMasterNodePayment) {
          //spork
          if(!masternodePayments.GetBlockPayee(pindexPrev->nHeight+1, payee)){
              int winningNode = GetCurrentMasterNode(1);
                  if(winningNode >= 0){
                      payee =GetScriptForDestination(vecMasternodes[winningNode].pubkey.GetID());
                  } else {
                      LogPrintf("CreateCoinStake: Failed to detect masternode to pay\n");
                      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);
          CEycoAddress address2(address1);
  
          LogPrintf("Masternode payment to %s\n", address2.ToString().c_str());
      }
  
      int64_t blockValue = nCredit;
      int64_t masternodePayment = GetMasternodePayment(pindexPrev->nHeight+1, nReward);
  
  
      // Set output amount
      if (!hasPayment && 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(hasPayment && 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(!hasPayment && txNew.vout.size() == 2) // only 1 stake output, was not split, no masternode payment
          txNew.vout[1].nValue = blockValue;
      else if(hasPayment && 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;
      }
  
      // 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)
  {
      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(true))
          {
              // This must not fail. The transaction has already been signed and recorded.
              LogPrintf("CommitTransaction() : Error: Transaction not valid\n");
              return false;
          }
          wtxNew.RelayWalletTransaction();
      }
      return true;
  }
  
  
  
  
  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;
      }
      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 = _("Error: Transaction creation failed!");
          LogPrintf("SendMoney() : %s\n", strError);
          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 "";
  }
  
  
  
  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");
  
      if (sNarr.length() > 24)
          return _("Narration must be 24 characters or less.");
  
      // Parse Eyco address
      CScript scriptPubKey;
      scriptPubKey.SetDestination(address);
  
      return SendMoney(scriptPubKey, nValue, sNarr, wtxNew, fAskFee);
  }
  
  
  string CWallet::PrepareDarksendDenominate(int minRounds, int maxRounds)
  {
      if (IsLocked())
          return _("Error: Wallet locked, unable to create transaction!");
  
      if(darkSendPool.GetState() != POOL_STATUS_ERROR && darkSendPool.GetState() != POOL_STATUS_SUCCESS)
          if(darkSendPool.GetMyTransactionCount() > 0)
              return _("Error: You already have pending entries in the Darksend pool");
  
      // ** find the coins we'll use
      std::vector<CTxIn> vCoins;
      std::vector<COutput> vCoins2;
      int64_t nValueIn = 0;
      CReserveKey reservekey(this);
  
      /*
          Select the coins we'll use
          if minRounds >= 0 it means only denominated inputs are going in and coming out
      */
      if(minRounds >= 0){
          if (!SelectCoinsByDenominations(darkSendPool.sessionDenom, 0.1*COIN, DARKSEND_POOL_MAX, vCoins, vCoins2, nValueIn, minRounds, maxRounds))
              return _("Insufficient funds");
      }
  
      // calculate total value out
      int64_t nTotalValue = GetTotalValue(vCoins);
      LogPrintf("PrepareDarksendDenominate - preparing darksend denominate . Got: %d \n", nTotalValue);
  
      //--------------
      BOOST_FOREACH(CTxIn v, vCoins)
          LockCoin(v.prevout);
  
      // denominate our funds
      int64_t nValueLeft = nTotalValue;
      std::vector<CTxOut> vOut;
      std::vector<int64_t> vDenoms;
  
      /*
          TODO: Front load with needed denominations (e.g. .1, 1 )
      */
  
      /*
          Add all denominations once
          The beginning of the list is front loaded with each possible
          denomination in random order. This means we'll at least get 1
          of each that is required as outputs.
      */
      BOOST_FOREACH(int64_t d, darkSendDenominations){
          vDenoms.push_back(d);
          vDenoms.push_back(d);
      }
  
      //randomize the order of these denominations
      std::random_shuffle (vDenoms.begin(), vDenoms.end());
  
      /*
          Build a long list of denominations
          Next we'll build a long random list of denominations to add.
          Eventually as the algorithm goes through these it'll find the ones
          it nees to get exact change.
      */
      for(int i = 0; i <= 500; i++)
          BOOST_FOREACH(int64_t d, darkSendDenominations)
              vDenoms.push_back(d);
  
      //randomize the order of inputs we get back
      std::random_shuffle (vDenoms.begin() + (int)darkSendDenominations.size() + 1, vDenoms.end());
  
      // Make outputs by looping through denominations randomly
      BOOST_REVERSE_FOREACH(int64_t v, vDenoms){
          //only use the ones that are approved
          bool fAccepted = false;
          if((darkSendPool.sessionDenom & (1 << 0))      && v == ((100000*COIN) +100000000)) {fAccepted = true;}
          else if((darkSendPool.sessionDenom & (1 << 1)) && v == ((10000*COIN)  +10000000)) {fAccepted = true;}
          else if((darkSendPool.sessionDenom & (1 << 2)) && v == ((1000*COIN)   +1000000)) {fAccepted = true;}
          else if((darkSendPool.sessionDenom & (1 << 3)) && v == ((100*COIN)    +100000)) {fAccepted = true;}
          else if((darkSendPool.sessionDenom & (1 << 4)) && v == ((10*COIN)     +10000)) {fAccepted = true;}
          else if((darkSendPool.sessionDenom & (1 << 5)) && v == ((1*COIN)      +1000)) {fAccepted = true;}
          else if((darkSendPool.sessionDenom & (1 << 6)) && v == ((.1*COIN)     +100)) {fAccepted = true;}
          if(!fAccepted) continue;
  
          int nOutputs = 0;
  
          // add each output up to 10 times until it can't be added again
          if(nValueLeft - v >= 0 && nOutputs <= 10) {
              CScript scriptChange;
              CPubKey vchPubKey;
              //use a unique change address
              assert(reservekey.GetReservedKey(vchPubKey)); // should never fail, as we just unlocked
              scriptChange =GetScriptForDestination(vchPubKey.GetID());
              reservekey.KeepKey();
  
              CTxOut o(v, scriptChange);
              vOut.push_back(o);
  
              //increment outputs and subtract denomination amount
              nOutputs++;
              nValueLeft -= v;
          }
  
          if(nValueLeft == 0) break;
      }
  
      //back up mode , incase we couldn't successfully make the outputs for some reason
      if(vOut.size() > 40 || darkSendPool.GetDenominations(vOut) != darkSendPool.sessionDenom || nValueLeft != 0){
          vOut.clear();
          nValueLeft = nTotalValue;
  
          // Make outputs by looping through denominations, from small to large
  
          BOOST_FOREACH(const COutput& out, vCoins2){
              CScript scriptChange;
              CPubKey vchPubKey;
              //use a unique change address
              assert(reservekey.GetReservedKey(vchPubKey)); // should never fail, as we just unlocked
              scriptChange =GetScriptForDestination(vchPubKey.GetID());
              reservekey.KeepKey();
  
              CTxOut o(out.tx->vout[out.i].nValue, scriptChange);
              vOut.push_back(o);
  
              //increment outputs and subtract denomination amount
              nValueLeft -= out.tx->vout[out.i].nValue;
  
              if(nValueLeft == 0) break;
          }
  
      }
  
      if(darkSendPool.GetDenominations(vOut) != darkSendPool.sessionDenom)
          return "Error: can't make current denominated outputs";
  
      // we don't support change at all
      if(nValueLeft != 0)
          return "Error: change left-over in pool. Must use denominations only";
  
  
      //randomize the output order
      std::random_shuffle (vOut.begin(), vOut.end());
  
      darkSendPool.SendDarksendDenominate(vCoins, vOut, nValueIn);
  
      return "";
  }
  
  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),
                               (fUpdated ? CT_UPDATED : CT_NEW) );
      if (!fFileBacked)
          return false;
      return CWalletDB(strWalletFile).WriteName(CEycoAddress(address).ToString(), strName);
  }
  
  bool CWallet::DelAddressBookName(const CTxDestination& address)
  {
      {
          LOCK(cs_wallet); // mapAddressBook
  
          mapAddressBook.erase(address);
      }
  
      NotifyAddressBookChanged(this, address, "", ::IsMine(*this, address), CT_DELETED);
  
      if (!fFileBacked)
          return false;
      return CWalletDB(strWalletFile).EraseName(CEycoAddress(address).ToString());
  }
  
  bool CWallet::SetDefaultKey(const CPubKey &vchPubKey)
  {
      if (fFileBacked)
      {
          if (!CWalletDB(strWalletFile).WriteDefaultKey(vchPubKey))
              return false;
      }
      vchDefaultKey = vchPubKey;
      return true;
  }
  
  //
  // Mark old keypool keys as used,
  // and generate all new keys
  //
  bool CWallet::NewKeyPool()
  {
      {
          LOCK(cs_wallet);
          CWalletDB walletdb(strWalletFile);
          BOOST_FOREACH(int64_t nIndex, setKeyPool)
              walletdb.ErasePool(nIndex);
          setKeyPool.clear();
  
          if (IsLocked())
              return false;
  
          int64_t nKeys = max(GetArg("-keypool", 100), (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;
          if (nSize > 0)
              nTargetSize = nSize;
          else
              nTargetSize = max(GetArg("-keypool", 100), (int64_t)0);
  
          while (setKeyPool.size() < (nTargetSize + 1))
          {
              int64_t nEnd = 1;
              if (!setKeyPool.empty())
                  nEnd = *(--setKeyPool.end()) + 1;
              if (!walletdb.WritePool(nEnd, CKeyPool(GenerateNewKey())))
                  throw runtime_error("TopUpKeyPool() : writing generated key failed");
              setKeyPool.insert(nEnd);
              LogPrintf("keypool added key %d, size=%u\n", nEnd, setKeyPool.size());
          }
      }
      return true;
  }
  
  void CWallet::ReserveKeyFromKeyPool(int64_t& nIndex, CKeyPool& keypool)
  {
      nIndex = -1;
      keypool.vchPubKey = CPubKey();
      {
          LOCK(cs_wallet);
  
          if (!IsLocked())
              TopUpKeyPool();
  
          // Get the oldest key
          if(setKeyPool.empty())
              return;
  
          CWalletDB walletdb(strWalletFile);
  
          nIndex = *(setKeyPool.begin());
          setKeyPool.erase(setKeyPool.begin());
          if (!walletdb.ReadPool(nIndex, keypool))
              throw runtime_error("ReserveKeyFromKeyPool() : read failed");
          if (!HaveKey(keypool.vchPubKey.GetID()))
              throw runtime_error("ReserveKeyFromKeyPool() : unknown key in key pool");
          assert(keypool.vchPubKey.IsValid());
          LogPrintf("keypool reserve %d\n", nIndex);
      }
  }
  
  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() ? 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]))
          {
              // group all input addresses with each other
              BOOST_FOREACH(CTxIn txin, pcoin->vin)
              {
                  CTxDestination address;
                  if(!ExtractDestination(mapWallet[txin.prevout.hash].vout[txin.prevout.n].scriptPubKey, address))
                      continue;
                  grouping.insert(address);
              }
  
              // group change with input addresses
              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);
                  }
              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 EYCO %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 EYCO %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);
      }
  }
  
  void CWallet::UpdatedTransaction(const uint256 &hashTx)
  {
      {
          LOCK(cs_wallet);
          // Only notify UI if this transaction is in this wallet
          map<uint256, CWalletTx>::const_iterator mi = mapWallet.find(hashTx);
          if (mi != mapWallet.end())
              NotifyTransactionChanged(this, hashTx, CT_UPDATED);
      }
  }
  
  
  void CWallet::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::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;
  }
  
  int CMerkleTx::GetTransactionLockSignatures() const
  {
      if(!IsSporkActive(SPORK_1_MASTERNODE_PAYMENTS_ENFORCEMENT)) return -3;
      if(nInstantXDepth == 0) return -1;
  
      //compile consessus vote
      std::map<uint256, CTransactionLock>::iterator i = mapTxLocks.find(GetHash());
      if (i != mapTxLocks.end()){
          return (*i).second.CountSignatures();
      }
  
      return -1;
  }
  
  bool CMerkleTx::IsTransactionLockTimedOut() const
  {
      if(nInstantXDepth == 0) return 0;
  
      //compile consessus vote
      std::map<uint256, CTransactionLock>::iterator i = mapTxLocks.find(GetHash());
      if (i != mapTxLocks.end()){
          return GetTime() > (*i).second.nTimeout;
      }
  
      return false;
  }
  
  bool CWallet::AddAdrenalineNodeConfig(CAdrenalineNodeConfig nodeConfig)
  {
      bool rv = CWalletDB(strWalletFile).WriteAdrenalineNodeConfig(nodeConfig.sAlias, nodeConfig);
      if(rv)
  	uiInterface.NotifyAdrenalineNodeChanged(nodeConfig);
  
      return rv;
  }
  