// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2012 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include "wallet.h"
#include "base58.h"
#include "blockparams.h"
#include "coincontrol.h"
#include "kernel.h"
#include "net.h"
#include "util.h"
#include "txdb.h"
#include "ui_interface.h"
#include "walletdb.h"
#include "crypter.h"
#include "key.h"
#include "spork.h"
#include "mnengine.h"
#include "instantx.h"
#include "masternodeman.h"
#include "masternode-payments.h"
#include "chainparams.h"
#include "smessage.h"

#include <boost/algorithm/string/replace.hpp>

using namespace std;

// Settings
int64_t nTransactionFee = MIN_TX_FEE;
int64_t nReserveBalance = 0;
int64_t nMinimumInputValue = 0;
int64_t nPoSageReward = 0;

int64_t GetStakeCombineThreshold() { return GetArg("-stakethreshold", 1000) * COIN; }
static int64_t GetStakeSplitThreshold() { return 2 * GetStakeCombineThreshold(); }

//////////////////////////////////////////////////////////////////////////////
//
// mapWallet
//

struct CompareValueOnly
{
    bool operator()(const pair<int64_t, pair<const CWalletTx*, unsigned int> >& t1,
                    const pair<int64_t, pair<const CWalletTx*, unsigned int> >& t2) const
    {
        return t1.first < t2.first;
    }
};

const CWalletTx* CWallet::GetWalletTx(const uint256& hash) const
{
    LOCK(cs_wallet);
    std::map<uint256, CWalletTx>::const_iterator it = mapWallet.find(hash);
    if (it == mapWallet.end())
        return NULL;
    return &(it->second);
}

CPubKey CWallet::GenerateNewKey()
{
    AssertLockHeld(cs_wallet); // mapKeyMetadata
    bool fCompressed = CanSupportFeature(FEATURE_COMPRPUBKEY); // default to compressed public keys if we want 0.6.0 wallets

    CKey secret;
    secret.MakeNewKey(fCompressed);

    // Compressed public keys were introduced in version 0.6.0
    if (fCompressed)
        SetMinVersion(FEATURE_COMPRPUBKEY);

    CPubKey pubkey = secret.GetPubKey();
    assert(secret.VerifyPubKey(pubkey));

    // Create new metadata
    int64_t nCreationTime = GetTime();
    mapKeyMetadata[pubkey.GetID()] = CKeyMetadata(nCreationTime);
    if (!nTimeFirstKey || nCreationTime < nTimeFirstKey)
        nTimeFirstKey = nCreationTime;

    if (!AddKeyPubKey(secret, pubkey))
        throw std::runtime_error("CWallet::GenerateNewKey() : AddKey failed");
    return pubkey;
}

bool CWallet::AddKeyPubKey(const CKey& secret, const CPubKey &pubkey)
{
    AssertLockHeld(cs_wallet); // mapKeyMetadata
    if (!CCryptoKeyStore::AddKeyPubKey(secret, pubkey))
        return false;

        // check if we need to remove from watch-only
    CScript script;
    script = GetScriptForDestination(pubkey.GetID());
    if (HaveWatchOnly(script))
        RemoveWatchOnly(script);

    if (!fFileBacked)
        return true;
    if (!IsCrypted()) {
        return CWalletDB(strWalletFile).WriteKey(pubkey, secret.GetPrivKey(), mapKeyMetadata[pubkey.GetID()]);
    }
    return true;
}

bool CWallet::AddCryptedKey(const CPubKey &vchPubKey, const vector<unsigned char> &vchCryptedSecret)
{
    if (!CCryptoKeyStore::AddCryptedKey(vchPubKey, vchCryptedSecret))
        return false;
    if (!fFileBacked)
        return true;
    {
        LOCK(cs_wallet);
        if (pwalletdbEncryption)
            return pwalletdbEncryption->WriteCryptedKey(vchPubKey, vchCryptedSecret, mapKeyMetadata[vchPubKey.GetID()]);
        else
            return CWalletDB(strWalletFile).WriteCryptedKey(vchPubKey, vchCryptedSecret, mapKeyMetadata[vchPubKey.GetID()]);
    }
    return false;
}

bool CWallet::LoadKeyMetadata(const CPubKey &pubkey, const CKeyMetadata &meta)
{
    AssertLockHeld(cs_wallet); // mapKeyMetadata
    if (meta.nCreateTime && (!nTimeFirstKey || meta.nCreateTime < nTimeFirstKey))
        nTimeFirstKey = meta.nCreateTime;

    mapKeyMetadata[pubkey.GetID()] = meta;
    return true;
}

bool CWallet::LoadCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret)
{
    return CCryptoKeyStore::AddCryptedKey(vchPubKey, vchCryptedSecret);
}

bool CWallet::AddCScript(const CScript& redeemScript)
{
    if (!CCryptoKeyStore::AddCScript(redeemScript))
        return false;
    if (!fFileBacked)
        return true;
    return CWalletDB(strWalletFile).WriteCScript(Hash160(redeemScript), redeemScript);
}

// optional setting to unlock wallet for staking only
// serves to disable the trivial sendmoney when OS account compromised
// provides no real security
bool fWalletUnlockStakingOnly = false;

bool CWallet::LoadCScript(const CScript& redeemScript)
{
    /* A sanity check was added in pull #3843 to avoid adding redeemScripts
     * that never can be redeemed. However, old wallets may still contain
     * these. Do not add them to the wallet and warn. */
    if (redeemScript.size() > MAX_SCRIPT_ELEMENT_SIZE)
    {
        std::string strAddr = CBungeeAddress(redeemScript.GetID()).ToString();
        LogPrintf("%s: Warning: This wallet contains a redeemScript of size %u which exceeds maximum size %i thus can never be redeemed. Do not use address %s.\n",
            __func__, redeemScript.size(), MAX_SCRIPT_ELEMENT_SIZE, strAddr);
        return true;
    }

    return CCryptoKeyStore::AddCScript(redeemScript);
}

bool CWallet::AddWatchOnly(const CScript &dest)
{
    if (!CCryptoKeyStore::AddWatchOnly(dest))
        return false;
    nTimeFirstKey = 1; // No birthday information for watch-only keys.
    if (!fFileBacked)
        return true;
    return CWalletDB(strWalletFile).WriteWatchOnly(dest);
}

bool CWallet::RemoveWatchOnly(const CScript &dest)
{
    AssertLockHeld(cs_wallet);
    if (!CCryptoKeyStore::RemoveWatchOnly(dest))
        return false;
    if (!HaveWatchOnly())
        NotifyWatchonlyChanged(false);
    if (fFileBacked)
        if (!CWalletDB(strWalletFile).EraseWatchOnly(dest))
            return false;

    return true;
}

bool CWallet::LoadWatchOnly(const CScript &dest)
{
    return CCryptoKeyStore::AddWatchOnly(dest);
}

bool CWallet::Lock()
{
    if (IsLocked())
        return true;

    if (fDebug)
        printf("Locking wallet.\n");

    {
        LOCK(cs_wallet);
        CWalletDB wdb(strWalletFile);

        // -- load encrypted spend_secret of stealth addresses
        CStealthAddress sxAddrTemp;
        std::set<CStealthAddress>::iterator it;
        for (it = stealthAddresses.begin(); it != stealthAddresses.end(); ++it)
        {
            if (it->scan_secret.size() < 32)
                continue; // stealth address is not owned
            // -- CStealthAddress are only sorted on spend_pubkey
            CStealthAddress &sxAddr = const_cast<CStealthAddress&>(*it);
            if (fDebug)
                printf("Recrypting stealth key %s\n", sxAddr.Encoded().c_str());

            sxAddrTemp.scan_pubkey = sxAddr.scan_pubkey;
            if (!wdb.ReadStealthAddress(sxAddrTemp))
            {
                printf("Error: Failed to read stealth key from db %s\n", sxAddr.Encoded().c_str());
                continue;
            }
            sxAddr.spend_secret = sxAddrTemp.spend_secret;
        };
    }
    bool result = LockKeyStore();
    if (result)
    {
        // Reset the fWalletUnlockStakingOnly state if wallet is locked
        fWalletUnlockStakingOnly = false;
    }
    return result;
};

bool CWallet::Unlock(const SecureString& strWalletPassphrase, bool anonymizeOnly, bool stakingOnly)
{
    SecureString strWalletPassphraseFinal;

    // If already fully unlocked, only update fWalletUnlockAnonymizeOnly
    // If unlocked for staking only, the passphrase is needed
    if(!IsLocked() && !fWalletUnlockStakingOnly)
    {
        fWalletUnlockAnonymizeOnly = anonymizeOnly;
        return true;
    }

    strWalletPassphraseFinal = strWalletPassphrase;

    CCrypter crypter;
    CKeyingMaterial vMasterKey;

    {
        LOCK(cs_wallet);
        BOOST_FOREACH(const MasterKeyMap::value_type& pMasterKey, mapMasterKeys)
        {
            if(!crypter.SetKeyFromPassphrase(strWalletPassphraseFinal, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod))
                return false;
            if (!crypter.Decrypt(pMasterKey.second.vchCryptedKey, vMasterKey))
                return false;
            if (!CCryptoKeyStore::Unlock(vMasterKey))
                return false;
        break;
        }

        fWalletUnlockAnonymizeOnly = anonymizeOnly;
        fWalletUnlockStakingOnly = stakingOnly;
        UnlockStealthAddresses(vMasterKey);
        SecureMsgWalletUnlocked();
        return true;
    }
    return false;
}

bool CWallet::ChangeWalletPassphrase(const SecureString& strOldWalletPassphrase, const SecureString& strNewWalletPassphrase)
{
    bool fWasLocked = IsLocked();

    SecureString strOldWalletPassphraseFinal;
    strOldWalletPassphraseFinal = strOldWalletPassphrase;

    {
        LOCK(cs_wallet);
        Lock();

        CCrypter crypter;
        CKeyingMaterial vMasterKey;
        BOOST_FOREACH(MasterKeyMap::value_type& pMasterKey, mapMasterKeys)
        {
            if(!crypter.SetKeyFromPassphrase(strOldWalletPassphraseFinal, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod))
                return false;
            if (!crypter.Decrypt(pMasterKey.second.vchCryptedKey, vMasterKey))
                return false;
            if (CCryptoKeyStore::Unlock(vMasterKey)
        && UnlockStealthAddresses(vMasterKey))
            {
                int64_t nStartTime = GetTimeMillis();
                crypter.SetKeyFromPassphrase(strNewWalletPassphrase, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod);
                pMasterKey.second.nDeriveIterations = pMasterKey.second.nDeriveIterations * (100 / ((double)(GetTimeMillis() - nStartTime)));

                nStartTime = GetTimeMillis();
                crypter.SetKeyFromPassphrase(strNewWalletPassphrase, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod);
                pMasterKey.second.nDeriveIterations = (pMasterKey.second.nDeriveIterations + pMasterKey.second.nDeriveIterations * 100 / ((double)(GetTimeMillis() - nStartTime))) / 2;

                if (pMasterKey.second.nDeriveIterations < 25000)
                    pMasterKey.second.nDeriveIterations = 25000;

                LogPrintf("Wallet passphrase changed to an nDeriveIterations of %i\n", pMasterKey.second.nDeriveIterations);

                if (!crypter.SetKeyFromPassphrase(strNewWalletPassphrase, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod))
                    return false;
                if (!crypter.Encrypt(vMasterKey, pMasterKey.second.vchCryptedKey))
                    return false;
                CWalletDB(strWalletFile).WriteMasterKey(pMasterKey.first, pMasterKey.second);
                if (fWasLocked)
                    Lock();
                return true;
            }
        }
    }

    return false;
}

void CWallet::SetBestChain(const CBlockLocator& loc)
{
    CWalletDB walletdb(strWalletFile);
    walletdb.WriteBestBlock(loc);
}

bool CWallet::SetMinVersion(enum WalletFeature nVersion, CWalletDB* pwalletdbIn, bool fExplicit)
{
    LOCK(cs_wallet); // nWalletVersion
    if (nWalletVersion >= nVersion)
        return true;

    // when doing an explicit upgrade, if we pass the max version permitted, upgrade all the way
    if (fExplicit && nVersion > nWalletMaxVersion)
            nVersion = FEATURE_LATEST;

    nWalletVersion = nVersion;

    if (nVersion > nWalletMaxVersion)
        nWalletMaxVersion = nVersion;

    if (fFileBacked)
    {
        CWalletDB* pwalletdb = pwalletdbIn ? pwalletdbIn : new CWalletDB(strWalletFile);
        if (nWalletVersion > 40000)
            pwalletdb->WriteMinVersion(nWalletVersion);
        if (!pwalletdbIn)
            delete pwalletdb;
    }

    return true;
}

bool CWallet::SetMaxVersion(int nVersion)
{
    LOCK(cs_wallet); // nWalletVersion, nWalletMaxVersion
    // cannot downgrade below current version
    if (nWalletVersion > nVersion)
        return false;

    nWalletMaxVersion = nVersion;

    return true;
}

set<uint256> CWallet::GetConflicts(const uint256& txid) const
{
    set<uint256> result;
    AssertLockHeld(cs_wallet);

    std::map<uint256, CWalletTx>::const_iterator it = mapWallet.find(txid);
    if (it == mapWallet.end())
        return result;
    const CWalletTx& wtx = it->second;

    std::pair<TxSpends::const_iterator, TxSpends::const_iterator> range;

    BOOST_FOREACH(const CTxIn& txin, wtx.vin)
    {
        if (mapTxSpends.count(txin.prevout) <= 1)
            continue;  // No conflict if zero or one spends
        range = mapTxSpends.equal_range(txin.prevout);
        for (TxSpends::const_iterator it = range.first; it != range.second; ++it)
            result.insert(it->second);
    }
    return result;
}

void CWallet::SyncMetaData(pair<TxSpends::iterator, TxSpends::iterator> range)
{
    // We want all the wallet transactions in range to have the same metadata as
    // the oldest (smallest nOrderPos).
    // So: find smallest nOrderPos:

    int nMinOrderPos = std::numeric_limits<int>::max();
    const CWalletTx* copyFrom = NULL;
    for (TxSpends::iterator it = range.first; it != range.second; ++it)
    {
        const uint256& hash = it->second;
        int n = mapWallet[hash].nOrderPos;
        if (n < nMinOrderPos)
        {
            nMinOrderPos = n;
            copyFrom = &mapWallet[hash];
        }
    }
    // Now copy data from copyFrom to rest:
    for (TxSpends::iterator it = range.first; it != range.second; ++it)
    {
        const uint256& hash = it->second;
        CWalletTx* copyTo = &mapWallet[hash];
        if (copyFrom == copyTo) continue;
        copyTo->mapValue = copyFrom->mapValue;
        copyTo->vOrderForm = copyFrom->vOrderForm;
        // fTimeReceivedIsTxTime not copied on purpose
        // nTimeReceived not copied on purpose
        copyTo->nTimeSmart = copyFrom->nTimeSmart;
        copyTo->fFromMe = copyFrom->fFromMe;
        copyTo->strFromAccount = copyFrom->strFromAccount;
        // nOrderPos not copied on purpose
        // cached members not copied on purpose
    }
}

// Outpoint is spent if any non-conflicted transaction
// spends it:
bool CWallet::IsSpent(const uint256& hash, unsigned int n) const
{
    const COutPoint outpoint(hash, n);
    pair<TxSpends::const_iterator, TxSpends::const_iterator> range;
    range = mapTxSpends.equal_range(outpoint);

    for (TxSpends::const_iterator it = range.first; it != range.second; ++it)
    {
        const uint256& wtxid = it->second;
        std::map<uint256, CWalletTx>::const_iterator mit = mapWallet.find(wtxid);
        if (mit != mapWallet.end() && mit->second.GetDepthInMainChain() >= 0)
            return true; // Spent
    }
    return false;
}

void CWallet::AddToSpends(const COutPoint& outpoint, const uint256& wtxid)
{
    mapTxSpends.insert(make_pair(outpoint, wtxid));

    pair<TxSpends::iterator, TxSpends::iterator> range;
    range = mapTxSpends.equal_range(outpoint);
    SyncMetaData(range);
}


void CWallet::AddToSpends(const uint256& wtxid)
{
    assert(mapWallet.count(wtxid));
    CWalletTx& thisTx = mapWallet[wtxid];
    if (thisTx.IsCoinBase()) // Coinbases don't spend anything!
        return;

    BOOST_FOREACH(const CTxIn& txin, thisTx.vin)
        AddToSpends(txin.prevout, wtxid);
}


bool CWallet::EncryptWallet(const SecureString& strWalletPassphrase)
{
    if (IsCrypted())
        return false;

    CKeyingMaterial vMasterKey;
    RandAddSeedPerfmon();

    vMasterKey.resize(WALLET_CRYPTO_KEY_SIZE);
    if (!GetRandBytes(&vMasterKey[0], WALLET_CRYPTO_KEY_SIZE))
        return false;

    CMasterKey kMasterKey(nDerivationMethodIndex);

    RandAddSeedPerfmon();
    kMasterKey.vchSalt.resize(WALLET_CRYPTO_SALT_SIZE);
    if (!GetRandBytes(&kMasterKey.vchSalt[0], WALLET_CRYPTO_SALT_SIZE))
        return false;

    CCrypter crypter;
    int64_t nStartTime = GetTimeMillis();
    crypter.SetKeyFromPassphrase(strWalletPassphrase, kMasterKey.vchSalt, 25000, kMasterKey.nDerivationMethod);
    kMasterKey.nDeriveIterations = 2500000 / ((double)(GetTimeMillis() - nStartTime));

    nStartTime = GetTimeMillis();
    crypter.SetKeyFromPassphrase(strWalletPassphrase, kMasterKey.vchSalt, kMasterKey.nDeriveIterations, kMasterKey.nDerivationMethod);
    kMasterKey.nDeriveIterations = (kMasterKey.nDeriveIterations + kMasterKey.nDeriveIterations * 100 / ((double)(GetTimeMillis() - nStartTime))) / 2;

    if (kMasterKey.nDeriveIterations < 25000)
        kMasterKey.nDeriveIterations = 25000;

    LogPrintf("Encrypting Wallet with an nDeriveIterations of %i\n", kMasterKey.nDeriveIterations);

    if (!crypter.SetKeyFromPassphrase(strWalletPassphrase, kMasterKey.vchSalt, kMasterKey.nDeriveIterations, kMasterKey.nDerivationMethod))
        return false;
    if (!crypter.Encrypt(vMasterKey, kMasterKey.vchCryptedKey))
        return false;

    {
        LOCK(cs_wallet);
        mapMasterKeys[++nMasterKeyMaxID] = kMasterKey;
        if (fFileBacked)
        {
            pwalletdbEncryption = new CWalletDB(strWalletFile);
            if (!pwalletdbEncryption->TxnBegin())
                return false;
            pwalletdbEncryption->WriteMasterKey(nMasterKeyMaxID, kMasterKey);
        }

        if (!EncryptKeys(vMasterKey))
        {
            if (fFileBacked)
                pwalletdbEncryption->TxnAbort();
            exit(1); //We now probably have half of our keys encrypted in memory, and half not...die and let the user reload their unencrypted wallet.
        }

        std::set<CStealthAddress>::iterator it;
        for (it = stealthAddresses.begin(); it != stealthAddresses.end(); ++it)
        {
            if (it->scan_secret.size() < 32)
                continue; // stealth address is not owned
            // -- CStealthAddress is only sorted on spend_pubkey
            CStealthAddress &sxAddr = const_cast<CStealthAddress&>(*it);

            if (fDebug)
                printf("Encrypting stealth key %s\n", sxAddr.Encoded().c_str());

            std::vector<unsigned char> vchCryptedSecret;

            CSecret vchSecret;
            vchSecret.resize(32);
            memcpy(&vchSecret[0], &sxAddr.spend_secret[0], 32);

            uint256 iv = Hash(sxAddr.spend_pubkey.begin(), sxAddr.spend_pubkey.end());
            if (!EncryptSecret(vMasterKey, vchSecret, iv, vchCryptedSecret))
            {
                printf("Error: Failed encrypting stealth key %s\n", sxAddr.Encoded().c_str());
                continue;
            };

            sxAddr.spend_secret = vchCryptedSecret;
            pwalletdbEncryption->WriteStealthAddress(sxAddr);
        };

        // Encryption was introduced in version 0.4.0
        SetMinVersion(FEATURE_WALLETCRYPT, pwalletdbEncryption, true);

        if (fFileBacked)
        {
            if (!pwalletdbEncryption->TxnCommit())
                exit(1); //We now have keys encrypted in memory, but no on disk...die to avoid confusion and let the user reload their unencrypted wallet.

            delete pwalletdbEncryption;
            pwalletdbEncryption = NULL;
        }

        Lock();
        Unlock(strWalletPassphrase);
        NewKeyPool();
        Lock();

        // Need to completely rewrite the wallet file; if we don't, bdb might keep
        // bits of the unencrypted private key in slack space in the database file.
        CDB::Rewrite(strWalletFile);
    }
    NotifyStatusChanged(this);

    return true;
}

int64_t CWallet::IncOrderPosNext(CWalletDB *pwalletdb)
{
    AssertLockHeld(cs_wallet); // nOrderPosNext
    int64_t nRet = nOrderPosNext++;
    if (pwalletdb) {
        pwalletdb->WriteOrderPosNext(nOrderPosNext);
    } else {
        CWalletDB(strWalletFile).WriteOrderPosNext(nOrderPosNext);
    }
    return nRet;
}

void CWallet::MarkDirty()
{
    {
        LOCK(cs_wallet);
        BOOST_FOREACH(PAIRTYPE(const uint256, CWalletTx)& item, mapWallet)
            item.second.MarkDirty();
    }
}

bool CWallet::AddToWallet(const CWalletTx& wtxIn, bool fFromLoadWallet)
{
    uint256 hash = wtxIn.GetHash();
    if (fFromLoadWallet)
    {
        mapWallet[hash] = wtxIn;
        CWalletTx& wtx = mapWallet[hash];
        wtx.BindWallet(this);
        wtxOrdered.insert(make_pair(wtx.nOrderPos, TxPair(&wtx, (CAccountingEntry*)0)));
        AddToSpends(hash);
    }
    else
    {
        LOCK(cs_wallet);
        // Inserts only if not already there, returns tx inserted or tx found
        pair<map<uint256, CWalletTx>::iterator, bool> ret = mapWallet.insert(make_pair(hash, wtxIn));
        CWalletTx& wtx = (*ret.first).second;
        wtx.BindWallet(this);
        bool fInsertedNew = ret.second;
        if (fInsertedNew)
        {
            wtx.nTimeReceived = GetAdjustedTime();
            wtx.nOrderPos = IncOrderPosNext();
            wtxOrdered.insert(make_pair(wtx.nOrderPos, TxPair(&wtx, (CAccountingEntry*)0)));

            wtx.nTimeSmart = wtx.nTimeReceived;
            if (wtxIn.hashBlock != 0)
            {
                if (mapBlockIndex.count(wtxIn.hashBlock))
                {
                    unsigned int latestNow = wtx.nTimeReceived;
                    unsigned int latestEntry = 0;
                    {
                        // Tolerate times up to the last timestamp in the wallet not more than 5 minutes into the future
                        int64_t latestTolerated = latestNow + 300;
                        const TxItems & txOrdered = wtxOrdered;
                        for (TxItems::const_reverse_iterator it = txOrdered.rbegin(); it != txOrdered.rend(); ++it)
                        {
                            CWalletTx *const pwtx = (*it).second.first;
                            if (pwtx == &wtx)
                                continue;
                            CAccountingEntry *const pacentry = (*it).second.second;
                            int64_t nSmartTime;
                            if (pwtx)
                            {
                                nSmartTime = pwtx->nTimeSmart;
                                if (!nSmartTime)
                                    nSmartTime = pwtx->nTimeReceived;
                            }
                            else
                                nSmartTime = pacentry->nTime;
                            if (nSmartTime <= latestTolerated)
                            {
                                latestEntry = nSmartTime;
                                if (nSmartTime > latestNow)
                                    latestNow = nSmartTime;
                                break;
                            }
                        }
                    }

                    unsigned int& blocktime = mapBlockIndex[wtxIn.hashBlock]->nTime;
                    wtx.nTimeSmart = std::max(latestEntry, std::min(blocktime, latestNow));
                }
                else
                    LogPrintf("AddToWallet() : found %s in block %s not in index\n",
                             wtxIn.GetHash().ToString(),
                             wtxIn.hashBlock.ToString());
            }
        }

        bool fUpdated = false;
        if (!fInsertedNew)
        {
            // Merge
            if (wtxIn.hashBlock != 0 && wtxIn.hashBlock != wtx.hashBlock)
            {
                wtx.hashBlock = wtxIn.hashBlock;
                fUpdated = true;
            }
            if (wtxIn.nIndex != -1 && (wtxIn.vMerkleBranch != wtx.vMerkleBranch || wtxIn.nIndex != wtx.nIndex))
            {
                wtx.vMerkleBranch = wtxIn.vMerkleBranch;
                wtx.nIndex = wtxIn.nIndex;
                fUpdated = true;
            }
            if (wtxIn.fFromMe && wtxIn.fFromMe != wtx.fFromMe)
            {
                wtx.fFromMe = wtxIn.fFromMe;
                fUpdated = true;
            }
            fUpdated |= wtx.UpdateSpent(wtxIn.vfSpent);
        }

        //// debug print
        LogPrintf("AddToWallet %s  %s%s\n", wtxIn.GetHash().ToString(), (fInsertedNew ? "new" : ""), (fUpdated ? "update" : ""));

        // Write to disk
        if (fInsertedNew || fUpdated)
            if (!wtx.WriteToDisk())
                return false;

        // Break debit/credit balance caches:
        wtx.MarkDirty();

        // Notify UI of new or updated transaction
        NotifyTransactionChanged(this, hash, fInsertedNew ? CT_NEW : CT_UPDATED);

        // notify an external script when a wallet transaction comes in or is updated
        std::string strCmd = GetArg("-walletnotify", "");

        if ( !strCmd.empty())
        {
            boost::replace_all(strCmd, "%s", wtxIn.GetHash().GetHex());
            boost::thread t(runCommand, strCmd); // thread runs free
        }

    }
    return true;
}

// Add a transaction to the wallet, or update it.
// pblock is optional, but should be provided if the transaction is known to be in a block.
// If fUpdate is true, existing transactions will be updated.
bool CWallet::AddToWalletIfInvolvingMe(const CTransaction& tx, const CBlock* pblock, bool fUpdate)
{
    uint256 hash = tx.GetHash();
    {
        LOCK(cs_wallet);
        bool fExisted = mapWallet.count(hash);
        if (fExisted && !fUpdate) return false;

        mapValue_t mapNarr;
        FindStealthTransactions(tx, mapNarr);

        if (fExisted || IsMine(tx) || IsFromMe(tx))
        {
            CWalletTx wtx(this,tx);

            if (!mapNarr.empty())
                wtx.mapValue.insert(mapNarr.begin(), mapNarr.end());

            // Get merkle branch if transaction was found in a block
            if (pblock)
                wtx.SetMerkleBranch(pblock);

            return AddToWallet(wtx);
        }
    }
    return false;
}

void CWallet::SyncTransaction(const CTransaction& tx, const CBlock* pblock, bool fConnect, bool fFixSpentCoins)
{
    LOCK2(cs_main, cs_wallet);
    if (!AddToWalletIfInvolvingMe(tx, pblock, true))
        return; // Not one of ours

    // If a transaction changes 'conflicted' state, that changes the balance
    // available of the outputs it spends. So force those to be
    // recomputed, also:
    BOOST_FOREACH(const CTxIn& txin, tx.vin)
    {
        if (mapWallet.count(txin.prevout.hash))
            mapWallet[txin.prevout.hash].MarkDirty();
    }

    if (!fConnect)
    {
        // wallets need to refund inputs when disconnecting coinstake
        if (tx.IsCoinStake())
        {
            if (IsFromMe(tx))
                DisableTransaction(tx);
        }
        return;
    }

    AddToWalletIfInvolvingMe(tx, pblock, true);

    if (fFixSpentCoins)
    {
        // Mark old coins as spent
        set<CWalletTx*> setCoins;
        BOOST_FOREACH(const CTxIn& txin, tx.vin)
        {
            CWalletTx &coin = mapWallet[txin.prevout.hash];
            coin.BindWallet(this);
            coin.MarkSpent(txin.prevout.n);
            coin.WriteToDisk();
            NotifyTransactionChanged(this, coin.GetHash(), CT_UPDATED);
        }
    }
}

void CWallet::EraseFromWallet(const uint256 &hash)
{
    if (!fFileBacked)
        return;
    {
        LOCK(cs_wallet);
        if (mapWallet.erase(hash))
            CWalletDB(strWalletFile).EraseTx(hash);
    }
    return;
}

isminetype CWallet::IsMine(const CTxIn &txin) const
{
    {
        LOCK(cs_wallet);
        map<uint256, CWalletTx>::const_iterator mi = mapWallet.find(txin.prevout.hash);
        if (mi != mapWallet.end())
        {
            const CWalletTx& prev = (*mi).second;
            if (txin.prevout.n < prev.vout.size())
                return IsMine(prev.vout[txin.prevout.n]);
        }
    }
    return ISMINE_NO;
}

CAmount CWallet::GetDebit(const CTxIn &txin, const isminefilter& filter) const
{
    {
        LOCK(cs_wallet);
        map<uint256, CWalletTx>::const_iterator mi = mapWallet.find(txin.prevout.hash);
        if (mi != mapWallet.end())
        {
            const CWalletTx& prev = (*mi).second;
            if (txin.prevout.n < prev.vout.size())
                if (IsMine(prev.vout[txin.prevout.n]) & filter)
                    return prev.vout[txin.prevout.n].nValue;
        }
    }
    return 0;
}

bool CWallet::IsChange(const CTxOut& txout) const
{
    // TODO: fix handling of 'change' outputs. The assumption is that any
    // payment to a script that is ours, but is not in the address book
    // is change. That assumption is likely to break when we implement multisignature
    // wallets that return change back into a multi-signature-protected address;
    // a better way of identifying which outputs are 'the send' and which are
    // 'the change' will need to be implemented (maybe extend CWalletTx to remember
    // which output, if any, was change).
    if (::IsMine(*this, txout.scriptPubKey))
    {
        CTxDestination address;
        if (!ExtractDestination(txout.scriptPubKey, address))
            return true;

        LOCK(cs_wallet);
        if (!mapAddressBook.count(address))
            return true;
    }
    return false;
}

int64_t CWalletTx::GetTxTime() const
{
    int64_t n = nTimeSmart;
    return n ? n : nTimeReceived;
}

int CWalletTx::GetRequestCount() const
{
    // Returns -1 if it wasn't being tracked
    int nRequests = -1;
    {
        LOCK(pwallet->cs_wallet);
        if (IsCoinBase() || IsCoinStake())
        {
            // Generated block
            if (hashBlock != 0)
            {
                map<uint256, int>::const_iterator mi = pwallet->mapRequestCount.find(hashBlock);
                if (mi != pwallet->mapRequestCount.end())
                    nRequests = (*mi).second;
            }
        }
        else
        {
            // Did anyone request this transaction?
            map<uint256, int>::const_iterator mi = pwallet->mapRequestCount.find(GetHash());
            if (mi != pwallet->mapRequestCount.end())
            {
                nRequests = (*mi).second;

                // How about the block it's in?
                if (nRequests == 0 && hashBlock != 0)
                {
                    map<uint256, int>::const_iterator mi = pwallet->mapRequestCount.find(hashBlock);
                    if (mi != pwallet->mapRequestCount.end())
                        nRequests = (*mi).second;
                    else
                        nRequests = 1; // If it's in someone else's block it must have got out
                }
            }
        }
    }
    return nRequests;
}

void CWalletTx::GetAmounts(list<pair<CTxDestination, int64_t> >& listReceived,
                           list<pair<CTxDestination, int64_t> >& listSent, CAmount& nFee, string& strSentAccount, const isminefilter& filter) const
{
    LOCK(pwallet->cs_wallet);
    nFee = 0;
    listReceived.clear();
    listSent.clear();
    strSentAccount = strFromAccount;

    // Compute fee:
    CAmount nDebit = GetDebit(filter);
    if (nDebit > 0) // debit>0 means we signed/sent this transaction
    {
        CAmount nValueOut = GetValueOut();
        nFee = nDebit - nValueOut;
    }

    // Sent/received.
    BOOST_FOREACH(const CTxOut& txout, vout)
    {
        // Skip special stake out
        if (txout.scriptPubKey.empty())
            continue;

        isminetype fIsMine = pwallet->IsMine(txout);
        // Only need to handle txouts if AT LEAST one of these is true:
        //   1) they debit from us (sent)
        //   2) the output is to us (received)
        if (nDebit > 0)
        {
            // Don't report 'change' txouts
        // TXNOTE: CoinControl possible fix related... with HD wallet we need to report change?
            if (pwallet->IsChange(txout))
                continue;
        }
        else if (!(fIsMine & filter))
            continue;

        // In either case, we need to get the destination address
        CTxDestination address;
        if (!ExtractDestination(txout.scriptPubKey, address))
        {
            LogPrintf("CWalletTx::GetAmounts: Unknown transaction type found, txid %s\n",
                     this->GetHash().ToString());
            address = CNoDestination();
        }

        // If we are debited by the transaction, add the output as a "sent" entry
        if (nDebit > 0)
            listSent.push_back(make_pair(address, txout.nValue));

        // If we are receiving the output, add it as a "received" entry
        if (fIsMine & filter)
            listReceived.push_back(make_pair(address, txout.nValue));
    }

}

void CWalletTx::GetAccountAmounts(const string& strAccount, CAmount& nReceived,
                                  CAmount& nSent, CAmount& nFee, const isminefilter& filter) const
{

    nReceived = nSent = nFee = 0;

    CAmount allFee;
    string strSentAccount;
    list<pair<CTxDestination, int64_t> > listReceived;
    list<pair<CTxDestination, int64_t> > listSent;
    GetAmounts(listReceived, listSent, allFee, strSentAccount, filter);

    if (strAccount == strSentAccount)
    {
        BOOST_FOREACH(const PAIRTYPE(CTxDestination,int64_t)& s, listSent)
            nSent += s.second;
        nFee = allFee;
    }
    {
        LOCK(pwallet->cs_wallet);
        BOOST_FOREACH(const PAIRTYPE(CTxDestination,int64_t)& r, listReceived)
        {
            if (pwallet->mapAddressBook.count(r.first))
            {
                map<CTxDestination, string>::const_iterator mi = pwallet->mapAddressBook.find(r.first);
                if (mi != pwallet->mapAddressBook.end() && (*mi).second == strAccount)
                    nReceived += r.second;
            }
            else if (strAccount.empty())
            {
                nReceived += r.second;
            }
        }
    }
}

void CWalletTx::AddSupportingTransactions(CTxDB& txdb)
{
    vtxPrev.clear();

    const int COPY_DEPTH = 3;
    if (SetMerkleBranch() < COPY_DEPTH)
    {
        vector<uint256> vWorkQueue;
        BOOST_FOREACH(const CTxIn& txin, vin)
            vWorkQueue.push_back(txin.prevout.hash);

        // This critsect is OK because txdb is already open
        {
            LOCK(pwallet->cs_wallet);
            map<uint256, const CMerkleTx*> mapWalletPrev;
            set<uint256> setAlreadyDone;
            for (unsigned int i = 0; i < vWorkQueue.size(); i++)
            {
                uint256 hash = vWorkQueue[i];
                if (setAlreadyDone.count(hash))
                    continue;
                setAlreadyDone.insert(hash);

                CMerkleTx tx;
                map<uint256, CWalletTx>::const_iterator mi = pwallet->mapWallet.find(hash);
                if (mi != pwallet->mapWallet.end())
                {
                    tx = (*mi).second;
                    BOOST_FOREACH(const CMerkleTx& txWalletPrev, (*mi).second.vtxPrev)
                        mapWalletPrev[txWalletPrev.GetHash()] = &txWalletPrev;
                }
                else if (mapWalletPrev.count(hash))
                {
                    tx = *mapWalletPrev[hash];
                }
                else if (txdb.ReadDiskTx(hash, tx))
                {
                    ;
                }
                else
                {
                    LogPrintf("ERROR: AddSupportingTransactions() : unsupported transaction\n");
                    continue;
                }

                int nDepth = tx.SetMerkleBranch();
                vtxPrev.push_back(tx);

                if (nDepth < COPY_DEPTH)
                {
                    BOOST_FOREACH(const CTxIn& txin, tx.vin)
                        vWorkQueue.push_back(txin.prevout.hash);
                }
            }
        }
    }

    reverse(vtxPrev.begin(), vtxPrev.end());
}

bool CWalletTx::WriteToDisk()
{
    return CWalletDB(pwallet->strWalletFile).WriteTx(GetHash(), *this);
}

// Scan the block chain (starting in pindexStart) for transactions
// from or to us. If fUpdate is true, found transactions that already
// exist in the wallet will be updated.
int CWallet::ScanForWalletTransactions(CBlockIndex* pindexStart, bool fUpdate)
{
    int ret = 0;

    CBlockIndex* pindex = pindexStart;
    {
        LOCK2(cs_main, cs_wallet);
        while (pindex)
        {
            // no need to read and scan block, if block was created before
            // our wallet birthday (as adjusted for block time variability)
            if (nTimeFirstKey && (pindex->nTime < (nTimeFirstKey - 7200))) {
                pindex = pindex->pnext;
                continue;
            }

            CBlock block;
            block.ReadFromDisk(pindex, true);
            BOOST_FOREACH(CTransaction& tx, block.vtx)
            {
                if (AddToWalletIfInvolvingMe(tx, &block, fUpdate))
                    ret++;
            }
            pindex = pindex->pnext;
        }
    }
    return ret;
}

void CWallet::ReacceptWalletTransactions()
{
    CTxDB txdb("r");
    bool fRepeat = true;
    while (fRepeat)
    {
        LOCK2(cs_main, cs_wallet);
        fRepeat = false;
        vector<CDiskTxPos> vMissingTx;
        BOOST_FOREACH(PAIRTYPE(const uint256, CWalletTx)& item, mapWallet)
        {
            const uint256& wtxid = item.first;
            CWalletTx& wtx = item.second;
            assert(wtx.GetHash() == wtxid);

            int nDepth = wtx.GetDepthInMainChain();

            if (!wtx.IsCoinBase() && nDepth < 0)
            {
                // Try to add to memory pool
                LOCK(mempool.cs);
                wtx.AcceptToMemoryPool(false);
            }
            if ((wtx.IsCoinBase() && wtx.IsSpent(0)) || (wtx.IsCoinStake() && wtx.IsSpent(1)))
            {
                continue;
            }

            CTxIndex txindex;
            bool fUpdated = false;
            if (txdb.ReadTxIndex(wtx.GetHash(), txindex))
            {
                // Update fSpent if a tx got spent somewhere else by a copy of wallet.dat
                if (txindex.vSpent.size() != wtx.vout.size())
                {
                    LogPrintf("ERROR: ReacceptWalletTransactions() : txindex.vSpent.size() %u != wtx.vout.size() %u\n", txindex.vSpent.size(), wtx.vout.size());
                    continue;
                }
                for (unsigned int i = 0; i < txindex.vSpent.size(); i++)
                {
                    if (wtx.IsSpent(i))
                        continue;
                    if (!txindex.vSpent[i].IsNull() && IsMine(wtx.vout[i]))
                    {
                        wtx.MarkSpent(i);
                        fUpdated = true;
                        vMissingTx.push_back(txindex.vSpent[i]);
                    }
                }
                if (fUpdated)
                {
                    LogPrintf("ReacceptWalletTransactions found spent coin %s XBNG %s\n", FormatMoney(wtx.GetCredit(ISMINE_ALL)), wtx.GetHash().ToString());
                    wtx.MarkDirty();
                    wtx.WriteToDisk();
                }
            }
            else
            {
                // Re-accept any txes of ours that aren't already in a block
                if (!(wtx.IsCoinBase() || wtx.IsCoinStake()))
                    wtx.AcceptWalletTransaction(txdb);
            }
        }
        if (!vMissingTx.empty())
        {
            // TODO: optimize this to scan just part of the block chain?
            if (ScanForWalletTransactions(pindexGenesisBlock))
                fRepeat = true;  // Found missing transactions: re-do re-accept.
        }
    }
}

void CWalletTx::RelayWalletTransaction(CTxDB& txdb, std::string strCommand)
{
    if (!(IsCoinBase() || IsCoinStake()))
    {
        if (GetDepthInMainChain() == 0) {
            uint256 hash = GetHash();
            if(strCommand == "txlreq"){
                LogPrintf("Relaying txlreq %s\n", hash.ToString());
                mapTxLockReq.insert(make_pair(hash, ((CTransaction)*this)));
                CreateNewLock(((CTransaction)*this));
                RelayTransactionLockReq((CTransaction)*this, true);
            } else {
                LogPrintf("Relaying wtx %s\n", hash.ToString());
                RelayTransaction((CTransaction)*this, hash);
            }
        }
    }
}

void CWalletTx::RelayWalletTransaction(std::string strCommand)
{
   CTxDB txdb("r");
   RelayWalletTransaction(txdb, strCommand);
}

set<uint256> CWalletTx::GetConflicts() const
{
    set<uint256> result;
    if (pwallet != NULL)
    {
        uint256 myHash = GetHash();
        result = pwallet->GetConflicts(myHash);
        result.erase(myHash);
    }
    return result;
}

void CWallet::ResendWalletTransactions(bool fForce)
{
    if (!fForce)
    {
        // Do this infrequently and randomly to avoid giving away
        // that these are our transactions.
        static int64_t nNextTime;
        if (GetTime() < nNextTime)
            return;
        bool fFirst = (nNextTime == 0);
        nNextTime = GetTime() + GetRand(30 * 60);
        if (fFirst)
            return;

        // Only do it if there's been a new block since last time
        static int64_t nLastTime;
        if (nTimeBestReceived < nLastTime)
            return;
        nLastTime = GetTime();
    }

    // Rebroadcast any of our txes that aren't in a block yet
    LogPrintf("ResendWalletTransactions()\n");
    CTxDB txdb("r");
    {
        LOCK(cs_wallet);
        // Sort them in chronological order
        multimap<unsigned int, CWalletTx*> mapSorted;
        BOOST_FOREACH(PAIRTYPE(const uint256, CWalletTx)& item, mapWallet)
        {
            CWalletTx& wtx = item.second;
            // Don't rebroadcast until it's had plenty of time that
            // it should have gotten in already by now.
            if (fForce || nTimeBestReceived - (int64_t)wtx.nTimeReceived > 5 * 60)
                mapSorted.insert(make_pair(wtx.nTimeReceived, &wtx));
        }
        BOOST_FOREACH(PAIRTYPE(const unsigned int, CWalletTx*)& item, mapSorted)
        {
            CWalletTx& wtx = *item.second;
            wtx.RelayWalletTransaction(txdb);
        }
    }
}







//////////////////////////////////////////////////////////////////////////////
//
// Actions
//


CAmount CWallet::GetBalance() const
{
    CAmount nTotal = 0;
    {
        LOCK2(cs_main, cs_wallet);
        for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
        {
            const CWalletTx* pcoin = &(*it).second;
            if (pcoin->IsTrusted())
                nTotal += pcoin->GetAvailableCredit();
        }
    }

    return nTotal;
}

// ppcoin: total coins staked (non-spendable until maturity)
CAmount CWallet::GetStake() const
{
    CAmount nTotal = 0;
    LOCK2(cs_main, cs_wallet);
    for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
    {
        const CWalletTx* pcoin = &(*it).second;
        if (pcoin->IsCoinStake() && pcoin->GetBlocksToMaturity() > 0 && pcoin->GetDepthInMainChain() > 0)
            nTotal += CWallet::GetCredit(*pcoin, ISMINE_ALL);
    }
    return nTotal;
}

CAmount CWallet::GetNewMint() const
{
    CAmount nTotal = 0;
    LOCK2(cs_main, cs_wallet);
    for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
    {
        const CWalletTx* pcoin = &(*it).second;
        if (pcoin->IsCoinBase() && pcoin->GetBlocksToMaturity() > 0 && pcoin->GetDepthInMainChain() > 0)
            nTotal += CWallet::GetCredit(*pcoin, ISMINE_ALL);
    }
    return nTotal;
}

CAmount CWallet::GetUnconfirmedBalance() const
{
    CAmount nTotal = 0;
    {
        LOCK2(cs_main, cs_wallet);
        for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
        {
            const CWalletTx* pcoin = &(*it).second;
            if (!IsFinalTx(*pcoin) || (!pcoin->IsTrusted() && pcoin->GetDepthInMainChain() == 0))
                nTotal += pcoin->GetAvailableCredit();
        }
    }
    return nTotal;
}

CAmount CWallet::GetImmatureBalance() const
{
    CAmount nTotal = 0;
    {
        LOCK2(cs_main, cs_wallet);
        for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
        {
            const CWalletTx* pcoin = &(*it).second;
            nTotal += pcoin->GetImmatureCredit();
        }
    }
    return nTotal;
}

CAmount CWallet::GetWatchOnlyBalance() const
{
    CAmount nTotal = 0;
    {
        LOCK2(cs_main, cs_wallet);
        for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
        {
            const CWalletTx* pcoin = &(*it).second;
            if (pcoin->IsTrusted())
                nTotal += pcoin->GetAvailableWatchOnlyCredit();
        }
    }

    return nTotal;
}

CAmount CWallet::GetWatchOnlyStake() const
{
    CAmount nTotal = 0;
    LOCK2(cs_main, cs_wallet);
    for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
    {
        const CWalletTx* pcoin = &(*it).second;
        if (pcoin->IsCoinStake() && pcoin->GetBlocksToMaturity() > 0 && pcoin->GetDepthInMainChain() > 0)
            nTotal += CWallet::GetCredit(*pcoin, ISMINE_WATCH_ONLY);
    }
    return nTotal;
}

CAmount CWallet::GetUnconfirmedWatchOnlyBalance() const
{
    CAmount nTotal = 0;
    {
        LOCK2(cs_main, cs_wallet);
        for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
        {
            const CWalletTx* pcoin = &(*it).second;
            if (!IsFinalTx(*pcoin) || (!pcoin->IsTrusted() && pcoin->GetDepthInMainChain() == 0))
                nTotal += pcoin->GetAvailableWatchOnlyCredit();
        }
    }
    return nTotal;
}

CAmount CWallet::GetImmatureWatchOnlyBalance() const
{
    CAmount nTotal = 0;
    {
        LOCK2(cs_main, cs_wallet);
        for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
        {
            const CWalletTx* pcoin = &(*it).second;
            nTotal += pcoin->GetImmatureWatchOnlyCredit();
        }
    }
    return nTotal;
}

// populate vCoins with vector of available COutputs.
void CWallet::AvailableCoins(vector<COutput>& vCoins, bool fOnlyConfirmed, const CCoinControl *coinControl, AvailableCoinsType coin_type, bool useIX) const
{
    vCoins.clear();

    {
        LOCK2(cs_main, cs_wallet);
        for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
        {
            const CWalletTx* pcoin = &(*it).second;

            if (!IsFinalTx(*pcoin))
                continue;

            if (fOnlyConfirmed && !pcoin->IsTrusted())
                continue;

            if (pcoin->IsCoinBase() && pcoin->GetBlocksToMaturity() > 0)
                continue;

            if(pcoin->IsCoinStake() && pcoin->GetBlocksToMaturity() > 0)
                continue;

            int nDepth = pcoin->GetDepthInMainChain(false);
            if (nDepth <= 0) // NOTE: coincontrol fix / ignore 0 confirm
                continue;

            // do not use IX for inputs that have less then 6 blockchain confirmations
            if (useIX && nDepth < 10)
                continue;

            for (unsigned int i = 0; i < pcoin->vout.size(); i++) {
                bool found = false;
                if(coin_type == ONLY_NOT10000IFMN) {
                    found = !(fMasterNode && pcoin->vout[i].nValue == MasternodeCollateral(pindexBest->nHeight)*COIN);
                } else if (coin_type == ONLY_NONDENOMINATED_NOT10000IFMN){
                    if (IsCollateralAmount(pcoin->vout[i].nValue)) continue; // do not use collateral amounts
                    if(fMasterNode) found = pcoin->vout[i].nValue != MasternodeCollateral(pindexBest->nHeight)*COIN; // do not use Hot MN funds
                } else {
                    found = true;
                }
                if(!found) continue;

                isminetype mine = IsMine(pcoin->vout[i]);
                if (!(pcoin->IsSpent(i)) && mine != ISMINE_NO &&
                    !IsLockedCoin((*it).first, i) && pcoin->vout[i].nValue > 0 &&
                    (!coinControl || !coinControl->HasSelected() || coinControl->IsSelected((*it).first, i)))
                {
                    vCoins.push_back(COutput(pcoin, i, nDepth, mine & ISMINE_SPENDABLE));
                }
            }
        }
    }
}

void CWallet::AvailableCoinsMN(vector<COutput>& vCoins, bool fOnlyConfirmed, const CCoinControl *coinControl, AvailableCoinsType coin_type, bool useIX) const
{
    vCoins.clear();

    {
        LOCK2(cs_main, cs_wallet);
        for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
        {
            const CWalletTx* pcoin = &(*it).second;

            if (!IsFinalTx(*pcoin))
                continue;

            if (fOnlyConfirmed && !pcoin->IsTrusted())
                continue;

            if (pcoin->IsCoinBase() && pcoin->GetBlocksToMaturity() > 0)
                continue;

            if(pcoin->IsCoinStake() && pcoin->GetBlocksToMaturity() > 0)
                continue;

            int nDepth = pcoin->GetDepthInMainChain();
            if (nDepth <= 0) // NOTE: coincontrol fix / ignore 0 confirm
                continue;

            // do not use IX for inputs that have less then 6 blockchain confirmations
            if (useIX && nDepth < 10)
                continue;

            for (unsigned int i = 0; i < pcoin->vout.size(); i++) {
                bool found = false;
                if(coin_type == ONLY_NOT10000IFMN) {
                    found = !(fMasterNode && pcoin->vout[i].nValue == MasternodeCollateral(pindexBest->nHeight)*COIN);
                } else if (coin_type == ONLY_NONDENOMINATED_NOT10000IFMN){
                    if (IsCollateralAmount(pcoin->vout[i].nValue)) continue; // do not use collateral amounts
                    if(fMasterNode) found = pcoin->vout[i].nValue != MasternodeCollateral(pindexBest->nHeight)*COIN; // do not use Hot MN funds
                } else {
                    found = true;
                }
                if(!found) continue;

                isminetype mine = IsMine(pcoin->vout[i]);

                if (!(pcoin->IsSpent(i)) && mine != ISMINE_NO &&
                    !IsLockedCoin((*it).first, i) && pcoin->vout[i].nValue > 0 &&
                    (!coinControl || !coinControl->HasSelected() || coinControl->IsSelected((*it).first, i)))
                        vCoins.push_back(COutput(pcoin, i, nDepth, (mine & ISMINE_SPENDABLE) != ISMINE_NO));
            }
        }
    }
}

void CWallet::AvailableCoinsForStaking(vector<COutput>& vCoins, unsigned int nSpendTime) const
{
    vCoins.clear();

    {
        LOCK2(cs_main, cs_wallet);
        for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
        {
            const CWalletTx* pcoin = &(*it).second;

            int nDepth = pcoin->GetDepthInMainChain();

            if (nDepth < 500) {//ID44
                nStakeMinConfirmations = nStakeChainStartConfirmations;
            } else {
                nStakeMinConfirmations = 300;
            }

            if (nDepth < 1)
                continue;

            if (nDepth < nStakeMinConfirmations)
                continue;

            if (pcoin->GetBlocksToMaturity() > 0)
                continue;

            bool found = false;
            for (unsigned int i = 0; i < pcoin->vout.size(); i++){
                if (pcoin->vout[i].nValue == MasternodeCollateral(pindexBest->nHeight)*COIN){

                    //LogPrintf("CWallet::AvailableCoinsForStaking - Found Masternode collateral.\n");
                    found = true;
                    break;
                }
                if (IsCollateralAmount(pcoin->vout[i].nValue)){

                    //LogPrintf("CWallet::AvailableCoinsForStaking - Found Collateral amount.\n");
                    found = true;
                    break;
                }
            }

            if(found) continue;

            for (unsigned int i = 0; i < pcoin->vout.size(); i++) {
                isminetype mine = IsMine(pcoin->vout[i]);
                if (!(pcoin->IsSpent(i)) && mine != ISMINE_NO && pcoin->vout[i].nValue >= nMinimumInputValue)
                    vCoins.push_back(COutput(pcoin, i, nDepth, mine & ISMINE_SPENDABLE));
            }
        }
    }
}

static void ApproximateBestSubset(vector<pair<int64_t, pair<const CWalletTx*,unsigned int> > >vValue, int64_t nTotalLower, int64_t nTargetValue,
                                  vector<char>& vfBest, int64_t& nBest, int iterations = 1000)
{
    vector<char> vfIncluded;

    vfBest.assign(vValue.size(), true);
    nBest = nTotalLower;

    seed_insecure_rand();

    for (int nRep = 0; nRep < iterations && nBest != nTargetValue; nRep++)
    {
        vfIncluded.assign(vValue.size(), false);
        int64_t nTotal = 0;
        bool fReachedTarget = false;
        for (int nPass = 0; nPass < 2 && !fReachedTarget; nPass++)
        {
            for (unsigned int i = 0; i < vValue.size(); i++)
            {
                //The solver here uses a randomized algorithm,
                //the randomness serves no real security purpose but is just
                //needed to prevent degenerate behavior and it is important
                //that the rng fast. We do not use a constant random sequence,
                //because there may be some privacy improvement by making
                //the selection random.
                if (nPass == 0 ? insecure_rand()&1 : !vfIncluded[i])
                {
                    nTotal += vValue[i].first;
                    vfIncluded[i] = true;
                    if (nTotal >= nTargetValue)
                    {
                        fReachedTarget = true;
                        if (nTotal < nBest)
                        {
                            nBest = nTotal;
                            vfBest = vfIncluded;
                        }
                        nTotal -= vValue[i].first;
                        vfIncluded[i] = false;
                    }
                }
            }
        }
    }
}

bool CWallet::SelectCoinsMinConf(int64_t nTargetValue, unsigned int nSpendTime, int nConfMine, int nConfTheirs, vector<COutput> vCoins, set<pair<const CWalletTx*,unsigned int> >& setCoinsRet, int64_t& nValueRet) const
{
    setCoinsRet.clear();
    nValueRet = 0;

    // List of values less than target
    pair<int64_t, pair<const CWalletTx*,unsigned int> > coinLowestLarger;
    coinLowestLarger.first = std::numeric_limits<int64_t>::max();
    coinLowestLarger.second.first = NULL;
    vector<pair<int64_t, pair<const CWalletTx*,unsigned int> > > vValue;
    int64_t nTotalLower = 0;

    random_shuffle(vCoins.begin(), vCoins.end(), GetRandInt);

    BOOST_FOREACH(const COutput &output, vCoins)
    {
        if (!output.fSpendable)
            continue;

        const CWalletTx *pcoin = output.tx;

        if (output.nDepth < (pcoin->IsFromMe(ISMINE_ALL) ? nConfMine : nConfTheirs))
            continue;

        int i = output.i;

        // Follow the timestamp rules
        if (pcoin->nTime > nSpendTime)
            continue;

        int64_t n = pcoin->vout[i].nValue;

        pair<int64_t,pair<const CWalletTx*,unsigned int> > coin = make_pair(n,make_pair(pcoin, i));

        if (n == nTargetValue)
        {
            setCoinsRet.insert(coin.second);
            nValueRet += coin.first;
            return true;
        }
        else if (n < nTargetValue + CENT)
        {
            vValue.push_back(coin);
            nTotalLower += n;
        }
        else if (n < coinLowestLarger.first)
        {
            coinLowestLarger = coin;
        }
    }

    if (nTotalLower == nTargetValue)
    {
        for (unsigned int i = 0; i < vValue.size(); ++i)
        {
            setCoinsRet.insert(vValue[i].second);
            nValueRet += vValue[i].first;
        }
        return true;
    }

    if (nTotalLower < nTargetValue)
    {
        if (coinLowestLarger.second.first == NULL)
            return false;
        setCoinsRet.insert(coinLowestLarger.second);
        nValueRet += coinLowestLarger.first;
        return true;
    }

    // Solve subset sum by stochastic approximation
    sort(vValue.rbegin(), vValue.rend(), CompareValueOnly());
    vector<char> vfBest;
    int64_t nBest;

    ApproximateBestSubset(vValue, nTotalLower, nTargetValue, vfBest, nBest, 1000);
    if (nBest != nTargetValue && nTotalLower >= nTargetValue + CENT)
        ApproximateBestSubset(vValue, nTotalLower, nTargetValue + CENT, vfBest, nBest, 1000);

    // If we have a bigger coin and (either the stochastic approximation didn't find a good solution,
    //                                   or the next bigger coin is closer), return the bigger coin
    if (coinLowestLarger.second.first &&
        ((nBest != nTargetValue && nBest < nTargetValue + CENT) || coinLowestLarger.first <= nBest))
    {
        setCoinsRet.insert(coinLowestLarger.second);
        nValueRet += coinLowestLarger.first;
    }
    else {
        for (unsigned int i = 0; i < vValue.size(); i++)
            if (vfBest[i])
            {
                setCoinsRet.insert(vValue[i].second);
                nValueRet += vValue[i].first;
            }

        LogPrint("selectcoins", "SelectCoins() best subset: ");
        for (unsigned int i = 0; i < vValue.size(); i++)
            if (vfBest[i])
                LogPrint("selectcoins", "%s ", FormatMoney(vValue[i].first));
        LogPrint("selectcoins", "total %s\n", FormatMoney(nBest));
    }

    return true;
}

bool CWallet::SelectCoins(int64_t nTargetValue, unsigned int nSpendTime, set<pair<const CWalletTx*,unsigned int> >& setCoinsRet, int64_t& nValueRet, const CCoinControl* coinControl, AvailableCoinsType coin_type, bool useIX) const
{
    vector<COutput> vCoins;
    AvailableCoins(vCoins, true, coinControl, coin_type, useIX);

    // coin control -> return all selected outputs (we want all selected to go into the transaction for sure)
    if (coinControl && coinControl->HasSelected())
    {
        BOOST_FOREACH(const COutput& out, vCoins)
        {
            if(!out.fSpendable)
                continue;

            nValueRet += out.tx->vout[out.i].nValue;
            setCoinsRet.insert(make_pair(out.tx, out.i));
        }
        return (nValueRet >= nTargetValue);
    }

    boost::function<bool (const CWallet*, int64_t, unsigned int, int, int, std::vector<COutput>, std::set<std::pair<const CWalletTx*,unsigned int> >&, int64_t&)> f = &CWallet::SelectCoinsMinConf;

    return (f(this, nTargetValue, nSpendTime, 1, 10, vCoins, setCoinsRet, nValueRet) ||
            f(this, nTargetValue, nSpendTime, 1, 1, vCoins, setCoinsRet, nValueRet) ||
            f(this, nTargetValue, nSpendTime, 0, 1, vCoins, setCoinsRet, nValueRet));
}

// Select some coins without random shuffle or best subset approximation
bool CWallet::SelectCoinsForStaking(int64_t nTargetValue, unsigned int nSpendTime, set<pair<const CWalletTx*,unsigned int> >& setCoinsRet, int64_t& nValueRet) const
{
    vector<COutput> vCoins;
    AvailableCoinsForStaking(vCoins, nSpendTime);

    setCoinsRet.clear();
    nValueRet = 0;

    BOOST_FOREACH(COutput output, vCoins)
    {
        if(!output.fSpendable)
            continue;

        const CWalletTx *pcoin = output.tx;
        int i = output.i;

        // Stop if we've chosen enough inputs
        if (nValueRet >= nTargetValue)
            break;

        int64_t n = pcoin->vout[i].nValue;

        pair<int64_t,pair<const CWalletTx*,unsigned int> > coin = make_pair(n,make_pair(pcoin, i));

        if (n >= nTargetValue)
        {
            // If input value is greater or equal to target then simply insert
            //    it into the current subset and exit
            setCoinsRet.insert(coin.second);
            nValueRet += coin.first;
            break;
        }
        else if (n < nTargetValue + CENT)
        {
            setCoinsRet.insert(coin.second);
            nValueRet += coin.first;
        }
    }

    return true;
}

struct CompareByPriority
{
    bool operator()(const COutput& t1,
                    const COutput& t2) const
    {
        return t1.Priority() > t2.Priority();
    }
};

bool CWallet::SelectCoinsCollateral(std::vector<CTxIn>& setCoinsRet, int64_t& nValueRet) const
{
    vector<COutput> vCoins;

    //printf(" selecting coins for collateral\n");
    AvailableCoins(vCoins);

    //printf("found coins %d\n", (int)vCoins.size());

    set<pair<const CWalletTx*,unsigned int> > setCoinsRet2;

    BOOST_FOREACH(const COutput& out, vCoins)
    {
        // collateral inputs will always be a multiple of DARSEND_COLLATERAL, up to five
        if(IsCollateralAmount(out.tx->vout[out.i].nValue))
        {
            CTxIn vin = CTxIn(out.tx->GetHash(),out.i);

            vin.prevPubKey = out.tx->vout[out.i].scriptPubKey; // the inputs PubKey
            nValueRet += out.tx->vout[out.i].nValue;
            setCoinsRet.push_back(vin);
            setCoinsRet2.insert(make_pair(out.tx, out.i));
            return true;
        }
    }

    return false;
}

int CWallet::CountInputsWithAmount(int64_t nInputAmount)
{
    int64_t nTotal = 0;
    {
        LOCK(cs_wallet);
        for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
        {
            const CWalletTx* pcoin = &(*it).second;
            if (pcoin->IsTrusted()){
                int nDepth = pcoin->GetDepthInMainChain(false);

                for (unsigned int i = 0; i < pcoin->vout.size(); i++) {
                    bool mine = IsMine(pcoin->vout[i]);
                    COutput out = COutput(pcoin, i, nDepth, mine);
                    CTxIn vin = CTxIn(out.tx->GetHash(), out.i);

                    if(out.tx->vout[out.i].nValue != nInputAmount) continue;

                    if(pcoin->IsSpent(i) || !IsMine(pcoin->vout[i])) continue;

                    nTotal++;
                }
            }
        }
    }

    return nTotal;
}

bool CWallet::HasCollateralInputs(bool fOnlyConfirmed) const
{
    vector<COutput> vCoins;
    AvailableCoins(vCoins, fOnlyConfirmed);

    int nFound = 0;
    BOOST_FOREACH(const COutput& out, vCoins)
        if(IsCollateralAmount(out.tx->vout[out.i].nValue)) nFound++;

    return nFound > 0;
}

bool CWallet::IsCollateralAmount(int64_t nInputAmount) const
{
    return  nInputAmount != 0 && nInputAmount % MNengine_COLLATERAL == 0 && nInputAmount < MNengine_COLLATERAL * 5  && nInputAmount > MNengine_COLLATERAL;
}

bool CWallet::CreateCollateralTransaction(CTransaction& txCollateral, std::string& strReason)
{
    /*
        To doublespend a collateral transaction, it will require a fee higher than this. So there's
        still a significant cost.
    */
    CAmount nFeeRet = 0.001*COIN;

    txCollateral.vin.clear();
    txCollateral.vout.clear();
    txCollateral.nTime = GetAdjustedTime();

    CReserveKey reservekey(this);
    CAmount nValueIn2 = 0;
    std::vector<CTxIn> vCoinsCollateral;

    if (!SelectCoinsCollateral(vCoinsCollateral, nValueIn2))
    {
        strReason = "Error: MNengine requires a collateral transaction and could not locate an acceptable input!";
        return false;
    }

    // make our change address
    CScript scriptChange;
    CPubKey vchPubKey;
    assert(reservekey.GetReservedKey(vchPubKey)); // should never fail, as we just unlocked
    scriptChange = GetScriptForDestination(vchPubKey.GetID());
    reservekey.KeepKey();

    BOOST_FOREACH(CTxIn v, vCoinsCollateral)
        txCollateral.vin.push_back(v);

    if(nValueIn2 - MNengine_COLLATERAL - nFeeRet > 0) {
        //pay collateral charge in fees
        CTxOut vout3 = CTxOut(nValueIn2 - MNengine_COLLATERAL, scriptChange);
        txCollateral.vout.push_back(vout3);
    }

    int vinNumber = 0;
    BOOST_FOREACH(CTxIn v, txCollateral.vin) {
        if(!SignSignature(*this, v.prevPubKey, txCollateral, vinNumber, int(SIGHASH_ALL|SIGHASH_ANYONECANPAY))) {
            BOOST_FOREACH(CTxIn v, vCoinsCollateral)
                UnlockCoin(v.prevout);

            strReason = "CMNenginePool::Sign - Unable to sign collateral transaction! \n";
            return false;
        }
        vinNumber++;
    }

    return true;
}

bool CWallet::ConvertList(std::vector<CTxIn> vCoins, std::vector<int64_t>& vecAmounts)
{
    BOOST_FOREACH(CTxIn i, vCoins){
        if (mapWallet.count(i.prevout.hash))
        {
            CWalletTx& wtx = mapWallet[i.prevout.hash];
            if(i.prevout.n < wtx.vout.size()){
                vecAmounts.push_back(wtx.vout[i.prevout.n].nValue);
            }
        } else {
            LogPrintf("ConvertList -- Couldn't find transaction\n");
        }
    }
    return true;
}

bool CWallet::GetStakeWeightFromValue(const int64_t& nTime, const int64_t& nValue, uint64_t& nWeight)
{
        //This is a negative value when there is no weight. But set it to zero
        //so the user is not confused. Used in reporting in Coin Control.
        // Descisions based on this function should be used with care.
        int64_t nTimeWeight = GetWeight(nTime, (int64_t)GetTime());
        if (nTimeWeight < 0 )
                nTimeWeight=0;

        CBigNum bnCoinDayWeight = CBigNum(nValue) * nTimeWeight / COIN / (24 * 60 * 60);
        nWeight = bnCoinDayWeight.getuint64();
        return true;
}

bool CWallet::CreateTransaction(const vector<pair<CScript, int64_t> >& vecSend, CWalletTx& wtxNew, CReserveKey& reservekey,
                                int64_t& nFeeRet, int32_t& nChangePos, std::string& strFailReason, const CCoinControl* coinControl,
                                AvailableCoinsType coin_type, bool useIX)
{

    int64_t nValue = 0;

    BOOST_FOREACH (const PAIRTYPE(CScript, int64_t)& s, vecSend)
    {
        if (nValue < 0)
        {
            strFailReason = _("Transaction amounts must be positive");
            return false;
        }
        nValue += s.second;
    }
    if (vecSend.empty() || nValue < 0)
    {
        strFailReason = _("Transaction amounts must be positive");
        return false;
    }

    wtxNew.fTimeReceivedIsTxTime = true;
    wtxNew.BindWallet(this);

    {
        // txdb must be opened before the mapWallet lock
        CTxDB txdb("r");
        LOCK2(cs_main, cs_wallet);
        {
            nFeeRet = nTransactionFee;
            if(useIX) nFeeRet = max(CENT, nFeeRet);
            while (true)
            {
                wtxNew.vin.clear();
                wtxNew.vout.clear();
                wtxNew.fFromMe = true;

                int64_t nTotalValue = nValue + nFeeRet;
                double dPriority = 0;
                // vouts to the payees
                BOOST_FOREACH (const PAIRTYPE(CScript, int64_t)& s, vecSend)
                {
                    CTxOut txout(s.second, s.first);
                    bool fOpReturn = false;

                    if(txout.IsNull() || (!txout.IsEmpty() && txout.nValue == 0))
                    {
                        txnouttype whichType;
                        vector<valtype> vSolutions;
                        if (!Solver(txout.scriptPubKey, whichType, vSolutions))
                        {
                            strFailReason = _("Invalid scriptPubKey");
                            return false;
                        }
                        if(whichType == TX_NONSTANDARD)
                        {
                            strFailReason = _("Unknown transaction type");
                            return false;
                        }
                        if(whichType == TX_NULL_DATA)
                            fOpReturn = true;
                    }

                    if (!fOpReturn && txout.IsDust(MIN_RELAY_TX_FEE))
                    {
                        strFailReason = _("Transaction amount too small");
                        return false;
                    }
                    wtxNew.vout.push_back(txout);
                }

                // Choose coins to use
                set<pair<const CWalletTx*,unsigned int> > setCoins;
                int64_t nValueIn = 0;

                if (!SelectCoins(nTotalValue, wtxNew.nTime, setCoins, nValueIn, coinControl, coin_type, useIX))
                {
                    if(coin_type == ALL_COINS) {
                        strFailReason = _(" Insufficient funds.");
                    } else if (coin_type == ONLY_NOT10000IFMN) {
                        strFailReason = _(" Unable to locate enough MNengine non-denominated funds for this transaction.");
                    } else if (coin_type == ONLY_NONDENOMINATED_NOT10000IFMN ) {
                        strFailReason = _(" Unable to locate enough MNengine non-denominated funds for this transaction that are not equal 1000 XBNG.");
                    }

                    if(useIX){
                        strFailReason += _(" InstantX requires inputs with at least 10 confirmations, you might need to wait a few minutes and try again.");
                    }
                    return false;
                }
                BOOST_FOREACH(PAIRTYPE(const CWalletTx*, unsigned int) pcoin, setCoins)
                {
                    int64_t nCredit = pcoin.first->vout[pcoin.second].nValue;
                    //The coin age after the next block (depth+1) is used instead of the current,
                    //reflecting an assumption the user would accept a bit more delay for
                    //a chance at a free transaction.
                    //But mempool inputs might still be in the mempool, so their age stays 0
                    int age = pcoin.first->GetDepthInMainChain();
                    if (age != 0)
                        age += 1;
                    dPriority += (double)nCredit * age;
                }

                int64_t nChange = nValueIn - nValue - nFeeRet;

                if (nChange > 0)
                {
                    // Fill a vout to ourself
                    // TODO: pass in scriptChange instead of reservekey so
                    // change transaction isn't always pay-to-Bungee-address
                    CScript scriptChange;

                    // coin control: send change to custom address
                    if (coinControl && !boost::get<CNoDestination>(&coinControl->destChange))
                        scriptChange.SetDestination(coinControl->destChange);

                    // no coin control: send change to newly generated address
                    else
                    {
                        // Note: We use a new key here to keep it from being obvious which side is the change.
                        //  The drawback is that by not reusing a previous key, the change may be lost if a
                        //  backup is restored, if the backup doesn't have the new private key for the change.
                        //  If we reused the old key, it would be possible to add code to look for and
                        //  rediscover unknown transactions that were written with keys of ours to recover
                        //  post-backup change.

                        // Reserve a new key pair from key pool
                        CPubKey vchPubKey;
                        bool ret;
                        ret = reservekey.GetReservedKey(vchPubKey);
                        assert(ret); // should never fail, as we just unlocked

                        scriptChange.SetDestination(vchPubKey.GetID());
                    }

                    CTxOut newTxOut(nChange, scriptChange);

                    // Never create dust outputs; if we would, just
                    // add the dust to the fee.
                    if (newTxOut.IsDust(MIN_RELAY_TX_FEE))
                    {
                        nFeeRet += nChange;
                        nChange = 0;
                        reservekey.ReturnKey();
                    }
                    else
                    {
                        // Insert change txn at random position:
                        vector<CTxOut>::iterator position = wtxNew.vout.begin()+GetRandInt(wtxNew.vout.size()+1);
                        wtxNew.vout.insert(position, newTxOut);
                    }
                }
                else
                    reservekey.ReturnKey();

                // Fill vin
                //
                // Note how the sequence number is set to max()-1 so that the
                // nLockTime set above actually works.
                BOOST_FOREACH(const PAIRTYPE(const CWalletTx*,unsigned int)& coin, setCoins)
                    wtxNew.vin.push_back(CTxIn(coin.first->GetHash(),coin.second));

                // Sign
                int nIn = 0;
                BOOST_FOREACH(const PAIRTYPE(const CWalletTx*,unsigned int)& coin, setCoins)
                    if (!SignSignature(*this, *coin.first, wtxNew, nIn++))
                    {
                        strFailReason = _(" Signing transaction failed");
                        return false;
                    }

                // Limit size
                unsigned int nBytes = ::GetSerializeSize(*(CTransaction*)&wtxNew, SER_NETWORK, PROTOCOL_VERSION);
                if (nBytes >= MAX_STANDARD_TX_SIZE)
                {
                    strFailReason = _(" Transaction too large");
                    return false;
                }
                dPriority = wtxNew.ComputePriority(dPriority, nBytes);

                // Check that enough fee is included
                int64_t nPayFee = nTransactionFee * (1 + (int64_t)nBytes / 1000);
                bool fAllowFree = AllowFree(dPriority);
                int64_t nMinFee = GetMinFee(wtxNew, nBytes, fAllowFree, GMF_SEND);

                if (nFeeRet < max(nPayFee, nMinFee))
                {
                    nFeeRet = max(nPayFee, nMinFee);
                    if(useIX) nFeeRet = max(CENT, nFeeRet);
                    continue;
                }
                // Fill vtxPrev by copying from previous transactions vtxPrev
                wtxNew.AddSupportingTransactions(txdb);
                wtxNew.fTimeReceivedIsTxTime = true;

                break;
            }
        }
    }
    return true;
}

bool CWallet::CreateTransaction(CScript scriptPubKey, int64_t nValue, std::string& sNarr, CWalletTx& wtxNew, CReserveKey& reservekey, int64_t& nFeeRet, const CCoinControl* coinControl)
{
    vector< pair<CScript, int64_t> > vecSend;
    vecSend.push_back(make_pair(scriptPubKey, nValue));

    if (sNarr.length() > 0)
    {
        std::vector<uint8_t> vNarr(sNarr.c_str(), sNarr.c_str() + sNarr.length());
        std::vector<uint8_t> vNDesc;

        vNDesc.resize(2);
        vNDesc[0] = 'n';
        vNDesc[1] = 'p';

        CScript scriptN = CScript() << OP_RETURN << vNDesc << OP_RETURN << vNarr;

        vecSend.push_back(make_pair(scriptN, 0));
    }

    // -- CreateTransaction won't place change between value and narr output.
    //    narration output will be for preceding output

    int nChangePos;
    std::string strFailReason;
    bool rv = CreateTransaction(vecSend, wtxNew, reservekey, nFeeRet, nChangePos, strFailReason, coinControl);
    if(!strFailReason.empty())
    {
        LogPrintf("CreateTransaction(): ERROR: %s\n", strFailReason);
        return false;
    }
    // -- narration will be added to mapValue later in FindStealthTransactions From CommitTransaction
    return rv;
}


bool CWallet::NewStealthAddress(std::string& sError, std::string& sLabel, CStealthAddress& sxAddr)
{
    ec_secret scan_secret;
    ec_secret spend_secret;

    if (GenerateRandomSecret(scan_secret) != 0
        || GenerateRandomSecret(spend_secret) != 0)
    {
        sError = "GenerateRandomSecret failed.";
        printf("Error CWallet::NewStealthAddress - %s\n", sError.c_str());
        return false;
    };

    ec_point scan_pubkey, spend_pubkey;
    if (SecretToPublicKey(scan_secret, scan_pubkey) != 0)
    {
        sError = "Could not get scan public key.";
        printf("Error CWallet::NewStealthAddress - %s\n", sError.c_str());
        return false;
    };

    if (SecretToPublicKey(spend_secret, spend_pubkey) != 0)
    {
        sError = "Could not get spend public key.";
        printf("Error CWallet::NewStealthAddress - %s\n", sError.c_str());
        return false;
    };

    if (fDebug)
    {
        printf("getnewstealthaddress: ");
        printf("scan_pubkey ");
        for (uint32_t i = 0; i < scan_pubkey.size(); ++i)
          printf("%02x", scan_pubkey[i]);
        printf("\n");

        printf("spend_pubkey ");
        for (uint32_t i = 0; i < spend_pubkey.size(); ++i)
          printf("%02x", spend_pubkey[i]);
        printf("\n");
    };


    sxAddr.label = sLabel;
    sxAddr.scan_pubkey = scan_pubkey;
    sxAddr.spend_pubkey = spend_pubkey;

    sxAddr.scan_secret.resize(32);
    memcpy(&sxAddr.scan_secret[0], &scan_secret.e[0], 32);
    sxAddr.spend_secret.resize(32);
    memcpy(&sxAddr.spend_secret[0], &spend_secret.e[0], 32);

    return true;
}

bool CWallet::AddStealthAddress(CStealthAddress& sxAddr)
{
    LOCK(cs_wallet);

    // must add before changing spend_secret
    stealthAddresses.insert(sxAddr);

    bool fOwned = sxAddr.scan_secret.size() == ec_secret_size;



    if (fOwned)
    {
        // -- owned addresses can only be added when wallet is unlocked
        if (IsLocked())
        {
            printf("Error: CWallet::AddStealthAddress wallet must be unlocked.\n");
            stealthAddresses.erase(sxAddr);
            return false;
        };

        if (IsCrypted())
        {
            std::vector<unsigned char> vchCryptedSecret;
            CSecret vchSecret;
            vchSecret.resize(32);
            memcpy(&vchSecret[0], &sxAddr.spend_secret[0], 32);

            uint256 iv = Hash(sxAddr.spend_pubkey.begin(), sxAddr.spend_pubkey.end());
            if (!EncryptSecret(vMasterKey, vchSecret, iv, vchCryptedSecret))
            {
                printf("Error: Failed encrypting stealth key %s\n", sxAddr.Encoded().c_str());
                stealthAddresses.erase(sxAddr);
                return false;
            };
            sxAddr.spend_secret = vchCryptedSecret;
        };
    };


    bool rv = CWalletDB(strWalletFile).WriteStealthAddress(sxAddr);

    if (rv)
        NotifyAddressBookChanged(this, sxAddr, sxAddr.label, fOwned, CT_NEW);

    return rv;
}

bool CWallet::UnlockStealthAddresses(const CKeyingMaterial& vMasterKeyIn)
{
    // -- decrypt spend_secret of stealth addresses
    std::set<CStealthAddress>::iterator it;
    for (it = stealthAddresses.begin(); it != stealthAddresses.end(); ++it)
    {
        if (it->scan_secret.size() < 32)
            continue; // stealth address is not owned

        // -- CStealthAddress are only sorted on spend_pubkey
        CStealthAddress &sxAddr = const_cast<CStealthAddress&>(*it);

        if (fDebug)
            printf("Decrypting stealth key %s\n", sxAddr.Encoded().c_str());

        CSecret vchSecret;
        uint256 iv = Hash(sxAddr.spend_pubkey.begin(), sxAddr.spend_pubkey.end());
        if(!DecryptSecret(vMasterKeyIn, sxAddr.spend_secret, iv, vchSecret)
            || vchSecret.size() != 32)
        {
            printf("Error: Failed decrypting stealth key %s\n", sxAddr.Encoded().c_str());
            continue;
        };

        ec_secret testSecret;
        memcpy(&testSecret.e[0], &vchSecret[0], 32);
        ec_point pkSpendTest;

        if (SecretToPublicKey(testSecret, pkSpendTest) != 0
            || pkSpendTest != sxAddr.spend_pubkey)
        {
            printf("Error: Failed decrypting stealth key, public key mismatch %s\n", sxAddr.Encoded().c_str());
            continue;
        };

        sxAddr.spend_secret.resize(32);
        memcpy(&sxAddr.spend_secret[0], &vchSecret[0], 32);
    };

    CryptedKeyMap::iterator mi = mapCryptedKeys.begin();
    for (; mi != mapCryptedKeys.end(); ++mi)
    {
        CPubKey &pubKey = (*mi).second.first;
        std::vector<unsigned char> &vchCryptedSecret = (*mi).second.second;
        if (vchCryptedSecret.size() != 0)
            continue;

        CKeyID ckid = pubKey.GetID();
        CBungeeAddress 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();
            CBungeeAddress coinAddress(keyID);
            printf("Adding secret to key %s.\n", coinAddress.ToString().c_str());
        };

        if (!AddKey(ckey))
        {
            printf("AddKey failed.\n");
            continue;
        };

        if (!CWalletDB(strWalletFile).EraseStealthKeyMeta(ckid))
            printf("EraseStealthKeyMeta failed for %s\n", addr.ToString().c_str());
    };
    return true;
}

bool CWallet::UpdateStealthAddress(std::string &addr, std::string &label, bool addIfNotExist)
{
    if (fDebug)
        printf("UpdateStealthAddress %s\n", addr.c_str());


    CStealthAddress sxAddr;

    if (!sxAddr.SetEncoded(addr))
        return false;

    std::set<CStealthAddress>::iterator it;
    it = stealthAddresses.find(sxAddr);

    ChangeType nMode = CT_UPDATED;
    CStealthAddress sxFound;
    if (it == stealthAddresses.end())
    {
        if (addIfNotExist)
        {
            sxFound = sxAddr;
            sxFound.label = label;
            stealthAddresses.insert(sxFound);
            nMode = CT_NEW;
        } else
        {
            printf("UpdateStealthAddress %s, not in set\n", addr.c_str());
            return false;
        };
    } else
    {
        sxFound = const_cast<CStealthAddress&>(*it);

        if (sxFound.label == label)
        {
            // no change
            return true;
        };

        it->label = label; // update in .stealthAddresses

        if (sxFound.scan_secret.size() == ec_secret_size)
        {
            printf("UpdateStealthAddress: todo - update owned stealth address.\n");
            return false;
        };
    };

    sxFound.label = label;

    if (!CWalletDB(strWalletFile).WriteStealthAddress(sxFound))
    {
        printf("UpdateStealthAddress(%s) Write to db failed.\n", addr.c_str());
        return false;
    };

    bool fOwned = sxFound.scan_secret.size() == ec_secret_size;
    NotifyAddressBookChanged(this, sxFound, sxFound.label, fOwned, nMode);

    return true;
}

bool CWallet::CreateStealthTransaction(CScript scriptPubKey, int64_t nValue, std::vector<uint8_t>& P, std::vector<uint8_t>& narr, std::string& sNarr, CWalletTx& wtxNew, CReserveKey& reservekey, int64_t& nFeeRet, const CCoinControl* coinControl)
{
    vector< pair<CScript, int64_t> > vecSend;
    vecSend.push_back(make_pair(scriptPubKey, nValue));

    CScript scriptP = CScript() << OP_RETURN << P;
    if (narr.size() > 0)
        scriptP = scriptP << OP_RETURN << narr;

    vecSend.push_back(make_pair(scriptP, 0));

    // -- shuffle inputs, change output won't mix enough as it must be not fully random for plantext narrations
    std::random_shuffle(vecSend.begin(), vecSend.end());

    int nChangePos;
    std::string strFailReason;
    bool rv = CreateTransaction(vecSend, wtxNew, reservekey, nFeeRet, nChangePos, strFailReason, coinControl);
    if(!strFailReason.empty())
        LogPrintf("CreateStealthTransaction(): %s\n", strFailReason);

    // -- the change txn is inserted in a random pos, check here to match narr to output
    if (rv && narr.size() > 0)
    {
        for (unsigned int k = 0; k < wtxNew.vout.size(); ++k)
        {
            if (wtxNew.vout[k].scriptPubKey != scriptPubKey
                || wtxNew.vout[k].nValue != nValue)
                continue;

            char key[64];
            if (snprintf(key, sizeof(key), "n_%u", k) < 1)
            {
                printf("CreateStealthTransaction(): Error creating narration key.");
                break;
            };
            wtxNew.mapValue[key] = sNarr;
            break;
        };
    };

    return rv;
}

string CWallet::SendStealthMoney(CScript scriptPubKey, int64_t nValue, std::vector<uint8_t>& P, std::vector<uint8_t>& narr, std::string& sNarr, CWalletTx& wtxNew, bool fAskFee)
{
    CReserveKey reservekey(this);
    int64_t nFeeRequired;

    if (IsLocked())
    {
        string strError = _("Error: Wallet locked, unable to create transaction  ");
        LogPrintf("SendStealthMoney() : %s\n", strError.c_str());
        return strError;
    }
    if (fWalletUnlockStakingOnly)
    {
        string strError = _("Error: Wallet unlocked for staking only, unable to create transaction.");
        LogPrintf("SendStealthMoney() : %s\n", strError.c_str());
        return strError;
    }
    if (!CreateStealthTransaction(scriptPubKey, nValue, P, narr, sNarr, wtxNew, reservekey, nFeeRequired))
    {
        string strError;
        if (nValue + nFeeRequired > GetBalance())
            strError = strprintf(_("Error: This transaction requires a transaction fee of at least %s because of its amount, complexity, or use of recently received funds  "), FormatMoney(nFeeRequired).c_str());
        else
            strError = "Failed to Create transaction";

        LogPrintf("SendStealthMoney() : %s\n", strError.c_str());
        return strError;
    }

    if (fAskFee && !uiInterface.ThreadSafeAskFee(nFeeRequired, _("Sending...")))
        return "ABORTED";

    if (!CommitTransaction(wtxNew, reservekey))
        return _("Error: The transaction was rejected.  This might happen if some of the coins in your wallet were already spent, such as if you used a copy of wallet.dat and coins were spent in the copy but not marked as spent here.");

    return "";
}

bool CWallet::SendStealthMoneyToDestination(CStealthAddress& sxAddress, int64_t nValue, std::string& sNarr, CWalletTx& wtxNew, std::string& sError, bool fAskFee)
{
    // -- Check amount
    if (nValue <= 0)
    {
        sError = "Invalid amount";
        return false;
    };
    if (nValue + nTransactionFee + (1) > GetBalance())
    {
        sError = "Insufficient funds";
        return false;
    };


    ec_secret ephem_secret;
    ec_secret secretShared;
    ec_point pkSendTo;
    ec_point ephem_pubkey;

    if (GenerateRandomSecret(ephem_secret) != 0)
    {
        sError = "GenerateRandomSecret failed.";
        return false;
    };

    if (StealthSecret(ephem_secret, sxAddress.scan_pubkey, sxAddress.spend_pubkey, secretShared, pkSendTo) != 0)
    {
        sError = "Could not generate receiving public key.";
        return false;
    };

    CPubKey cpkTo(pkSendTo);
    if (!cpkTo.IsValid())
    {
        sError = "Invalid public key generated.";
        return false;
    };

    CKeyID ckidTo = cpkTo.GetID();

    CBungeeAddress addrTo(ckidTo);

    if (SecretToPublicKey(ephem_secret, ephem_pubkey) != 0)
    {
        sError = "Could not generate ephem public key.";
        return false;
    };

    if (fDebug)
    {
        LogPrintf("Stealth send to generated pubkey %" PRIszu": %s\n", pkSendTo.size(), HexStr(pkSendTo).c_str());
        LogPrintf("hash %s\n", addrTo.ToString().c_str());
        LogPrintf("ephem_pubkey %" PRIszu": %s\n", ephem_pubkey.size(), HexStr(ephem_pubkey).c_str());
    };

    std::vector<unsigned char> vchNarr;

    // -- Parse Bungee 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();
                    CBungeeAddress 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)
                    {
                        CBungeeAddress coinAddress(keyID);
                        printf("Adding key %s.\n", coinAddress.ToString().c_str());
                    };

                    if (!AddKey(ckey))
                    {
                        printf("AddKey failed.\n");
                        continue;
                    };

                    std::string sLabel = it->Encoded();
                    SetAddressBookName(keyID, sLabel);
                    nFoundStealth++;
                };

                txnMatch = true;
                break;
            };
            if (txnMatch)
                break;
        };
    };

    return true;
};

uint64_t CWallet::GetStakeWeight() const
{
    // Choose coins to use
    int64_t nBalance = GetBalance();

    if (nBalance <= nReserveBalance)
        return 0;

    vector<const CWalletTx*> vwtxPrev;

    set<pair<const CWalletTx*,unsigned int> > setCoins;
    int64_t nValueIn = 0;

    if (!SelectCoinsForStaking(nBalance - nReserveBalance, GetTime(), setCoins, nValueIn))
        return 0;

    if (setCoins.empty())
        return 0;

    uint64_t nWeight = 0;

    LOCK2(cs_main, cs_wallet);
    BOOST_FOREACH(PAIRTYPE(const CWalletTx*, unsigned int) pcoin, setCoins)
    {
        if (pindexBest->nHeight < 500) {//ID44
            nStakeMinConfirmations = nStakeChainStartConfirmations;
        } else {
            nStakeMinConfirmations = 300;
        }
        if (pcoin.first->GetDepthInMainChain() >= nStakeMinConfirmations)
            nWeight += pcoin.first->vout[pcoin.second].nValue;
    }

    return nWeight;
}

bool CWallet::CreateCoinStake(const CKeyStore& keystore, unsigned int nBits, int64_t nSearchInterval, int64_t nFees, CTransaction& txNew, CKey& key)
{
    CBlockIndex* pindexPrev = pindexBest;
    CBigNum bnTargetPerCoinDay;
    bnTargetPerCoinDay.SetCompact(nBits);

    txNew.vin.clear();
    txNew.vout.clear();

    // OLD IMPLEMENTATION COMMNETED OUT
    //
    // Determine our payment script for devops
    // CScript devopsScript;
    // devopsScript << OP_DUP << OP_HASH160 << ParseHex(Params().DevOpsPubKey()) << OP_EQUALVERIFY << OP_CHECKSIG;

    // Mark coin stake transaction
    CScript scriptEmpty;
    scriptEmpty.clear();
    txNew.vout.push_back(CTxOut(0, scriptEmpty));

    // Choose coins to use
    int64_t nBalance = GetBalance();

    if (nBalance <= nReserveBalance)
        return false;

    vector<const CWalletTx*> vwtxPrev;

    set<pair<const CWalletTx*,unsigned int> > setCoins;
    int64_t nValueIn = 0;

    // Select coins with suitable depth
    if (!SelectCoinsForStaking(nBalance - nReserveBalance, txNew.nTime, setCoins, nValueIn))
        return false;

    if (setCoins.empty())
        return false;

    int64_t nCredit = 0;
    CScript scriptPubKeyKernel;
    CTxDB txdb("r");
    BOOST_FOREACH(PAIRTYPE(const CWalletTx*, unsigned int) pcoin, setCoins)
    {
        static int nMaxStakeSearchInterval = 60;
        bool fKernelFound = false;
        for (unsigned int n=0; n<min(nSearchInterval,(int64_t)nMaxStakeSearchInterval) && !fKernelFound && pindexPrev == pindexBest; n++)
        {
            boost::this_thread::interruption_point();
            // Search backward in time from the given txNew timestamp
            // Search nSearchInterval seconds back up to nMaxStakeSearchInterval
            COutPoint prevoutStake = COutPoint(pcoin.first->GetHash(), pcoin.second);
            int64_t nBlockTime;
            if (CheckKernel(pindexPrev, nBits, txNew.nTime - n, prevoutStake, &nBlockTime))
            {
                // Found a kernel
                LogPrint("coinstake", "CreateCoinStake : kernel found\n");
                vector<valtype> vSolutions;
                txnouttype whichType;
                CScript scriptPubKeyOut;
                scriptPubKeyKernel = pcoin.first->vout[pcoin.second].scriptPubKey;
                if (!Solver(scriptPubKeyKernel, whichType, vSolutions))
                {
                    LogPrint("coinstake", "CreateCoinStake : failed to parse kernel\n");
                    break;
                }
                LogPrint("coinstake", "CreateCoinStake : parsed kernel type=%d\n", whichType);
                if (whichType != TX_PUBKEY && whichType != TX_PUBKEYHASH)
                {
                    LogPrint("coinstake", "CreateCoinStake : no support for kernel type=%d\n", whichType);
                    break;  // only support pay to public key and pay to address
                }
                if (whichType == TX_PUBKEYHASH) // pay to address type
                {
                    // convert to pay to public key type
                    if (!keystore.GetKey(uint160(vSolutions[0]), key))
                    {
                        LogPrint("coinstake", "CreateCoinStake : failed to get key for kernel type=%d\n", whichType);
                        break;  // unable to find corresponding public key
                    }
                    scriptPubKeyOut << key.GetPubKey() << OP_CHECKSIG;
                }
                if (whichType == TX_PUBKEY)
                {
                    valtype& vchPubKey = vSolutions[0];
                    if (!keystore.GetKey(Hash160(vchPubKey), key))
                    {
                        LogPrint("coinstake", "CreateCoinStake : failed to get key for kernel type=%d\n", whichType);
                        break;  // unable to find corresponding public key
                    }

                    if (key.GetPubKey() != vchPubKey)
                    {
                        LogPrint("coinstake", "CreateCoinStake : invalid key for kernel type=%d\n", whichType);
                        break; // keys mismatch
                    }

                    scriptPubKeyOut = scriptPubKeyKernel;
                }

                txNew.nTime -= n;
                txNew.vin.push_back(CTxIn(pcoin.first->GetHash(), pcoin.second));
                nCredit += pcoin.first->vout[pcoin.second].nValue;
                vwtxPrev.push_back(pcoin.first);
                txNew.vout.push_back(CTxOut(0, scriptPubKeyOut));

                if(nCredit > GetStakeSplitThreshold())
                    txNew.vout.push_back(CTxOut(0, scriptPubKeyOut)); //split stake
                LogPrint("coinstake", "CreateCoinStake : added kernel type=%d\n", whichType);
                fKernelFound = true;
                break;
            }
        }

        if (fKernelFound)
            break; // if kernel is found stop searching
    }

    if (nCredit == 0 || nCredit > nBalance - nReserveBalance)
        return false;

    BOOST_FOREACH(PAIRTYPE(const CWalletTx*, unsigned int) pcoin, setCoins)
    {
        // Attempt to add more inputs
        // Only add coins of the same key/address as kernel
        if (txNew.vout.size() == 2 && ((pcoin.first->vout[pcoin.second].scriptPubKey == scriptPubKeyKernel || pcoin.first->vout[pcoin.second].scriptPubKey == txNew.vout[1].scriptPubKey))
            && pcoin.first->GetHash() != txNew.vin[0].prevout.hash)
        {
            int64_t nTimeWeight = GetWeight((int64_t)pcoin.first->nTime, (int64_t)txNew.nTime);

            // Stop adding more inputs if already too many inputs
            if (txNew.vin.size() >= 100)
                break;
            // Stop adding more inputs if value is already pretty significant
            if (nCredit >= GetStakeCombineThreshold())
                break;
            // Stop adding inputs if reached reserve limit
            if (nCredit + pcoin.first->vout[pcoin.second].nValue > nBalance - nReserveBalance)
                break;
            // Do not add additional significant input
            if (pcoin.first->vout[pcoin.second].nValue >= GetStakeCombineThreshold())
                continue;
            // Do not add input that is still too young
            if (nTimeWeight < nStakeMinAge)
                continue;

            txNew.vin.push_back(CTxIn(pcoin.first->GetHash(), pcoin.second));
            nCredit += pcoin.first->vout[pcoin.second].nValue;
            vwtxPrev.push_back(pcoin.first);
        }
    }

    // Calculate coin age reward
    int64_t nReward;
    {
        uint64_t nCoinAge;
        CTxDB txdb("r");
        if (!txNew.GetCoinAge(txdb, pindexPrev, nCoinAge))
            return error("CreateCoinStake : failed to calculate coin age");

        nReward = GetProofOfStakeReward(pindexPrev, nCoinAge, nFees);
        if (nReward <= 0)
            return false;

        nCredit += nReward;
    }

    // Set TX values
    CScript payee;
    CScript devpayee;
    CTxIn vin;
    nPoSageReward = nReward;

    // define address
    CBitcoinAddress devopaddress;
    if (Params().NetworkID() == CChainParams::MAIN) {
        devopaddress = CBitcoinAddress("BPc6u7NybcDVi5xNXYDLPQ2HvbC7BtbY8m");
    } else if (Params().NetworkID() == CChainParams::TESTNET) {
        devopaddress = CBitcoinAddress("");
    } else if (Params().NetworkID() == CChainParams::REGTEST) {
        devopaddress = CBitcoinAddress("");
    }

    // Masternode Payments
    int payments = 1;
    // start masternode payments
    bool bMasterNodePayment = false;

    if ( Params().NetworkID() == CChainParams::TESTNET ){
        if (GetTime() > START_MASTERNODE_PAYMENTS_TESTNET ){
            bMasterNodePayment = true;
        }
    }else{
        if (GetTime() > START_MASTERNODE_PAYMENTS){
            bMasterNodePayment = true;
        }
    }
    // stop masternode payments (for testing)
    if ( Params().NetworkID() == CChainParams::TESTNET ){
        if (GetTime() > STOP_MASTERNODE_PAYMENTS_TESTNET ){
            bMasterNodePayment = false;
        }
    }else{
        if (GetTime() > STOP_MASTERNODE_PAYMENTS){
            bMasterNodePayment = false;
        }
    }

    bool hasPayment = true;
    if(bMasterNodePayment) {
        //spork
        if(!masternodePayments.GetBlockPayee(pindexPrev->nHeight+1, payee, vin)){
            CMasternode* winningNode = mnodeman.GetCurrentMasterNode(1);
            if(winningNode){
                payee = GetScriptForDestination(winningNode->pubkey.GetID());
            } else {
                payee = GetScriptForDestination(devopaddress.Get());
            }
        }
    } else {
        hasPayment = false;
    }

    if(hasPayment){
        payments = txNew.vout.size() + 1;
        txNew.vout.resize(payments);

        txNew.vout[payments-1].scriptPubKey = payee;
        txNew.vout[payments-1].nValue = 0;

        CTxDestination address1;
        ExtractDestination(payee, address1);
        CBungeeAddress address2(address1);

        LogPrintf("Masternode payment to %s\n", address2.ToString().c_str());
    }

    // TODO: Clean this up, it's a mess (could be done much more cleanly)
    //       Not an issue otherwise, merely a pet peev. Done in a rush...
    //
    // DevOps Payments
    int devoppay = 1;
    // start devops payments
    bool bDevOpsPayment = false;

    if ( Params().NetworkID() == CChainParams::TESTNET ){
        if (GetTime() > START_DEVOPS_PAYMENTS_TESTNET ){
            bDevOpsPayment = true;
        }
    }else{
        if (GetTime() > START_DEVOPS_PAYMENTS){
            bDevOpsPayment = true;
        }
    }
    // stop devops payments (for testing)
    if ( Params().NetworkID() == CChainParams::TESTNET ){
        if (GetTime() > STOP_DEVOPS_PAYMENTS_TESTNET ){
            bDevOpsPayment = false;
        }
    }else{
        if (GetTime() > STOP_DEVOPS_PAYMENTS){
            bDevOpsPayment = false;
        }
    }

    bool hasdevopsPay = true;
    if(bDevOpsPayment) {
        // verify address
        if(devopaddress.IsValid())
        {
            //spork
            if(pindexBest->GetBlockTime() > 1546123500) { // ON  (Saturday, December 29, 2018 10:45 PM)
                    devpayee = GetScriptForDestination(devopaddress.Get());
            }
            else {
                hasdevopsPay = false;
            }
        }
        else
        {
            return error("CreateCoinStake: Failed to detect dev address to pay\n");
        }
    }
    else {
        hasdevopsPay = false;
    }

    if(hasdevopsPay){
        devoppay = txNew.vout.size() + 1;
        txNew.vout.resize(devoppay);

        txNew.vout[devoppay-1].scriptPubKey = devpayee;
        txNew.vout[devoppay-1].nValue = 0;

        CTxDestination address1;
        ExtractDestination(devpayee, address1);
        CBungeeAddress address2(address1);

        LogPrintf("DevOps payment to %s\n", address2.ToString().c_str());
    }

    int64_t blockValue = nCredit;
    int64_t masternodePayment = GetMasternodePayment(pindexPrev->nHeight+1, nReward);
    int64_t devopsPayment = GetDevOpsPayment(pindexPrev->nHeight+1, nReward);


    // Set output amount
    // Standard stake (no Masternode or DevOps payments)
    if (!hasPayment && !hasdevopsPay)
    {
        if(txNew.vout.size() == 3){ // 2 stake outputs, stake was split, no masternode payment
            txNew.vout[1].nValue = (blockValue / 2 / CENT) * CENT;
            txNew.vout[2].nValue = blockValue - txNew.vout[1].nValue;
        }
        else if(txNew.vout.size() == 2){ // only 1 stake output, was not split, no masternode payment
            txNew.vout[1].nValue = blockValue;
        }
    }
    else if(hasPayment && !hasdevopsPay)
    {
        if(txNew.vout.size() == 4){ // 2 stake outputs, stake was split, plus a masternode payment
            txNew.vout[payments-1].nValue = masternodePayment;
            blockValue -= masternodePayment;
            txNew.vout[1].nValue = (blockValue / 2 / CENT) * CENT;
            txNew.vout[2].nValue = blockValue - txNew.vout[1].nValue;
        }
        else if(txNew.vout.size() == 3){ // only 1 stake output, was not split, plus a masternode payment
            txNew.vout[payments-1].nValue = masternodePayment;
            blockValue -= masternodePayment;
            txNew.vout[1].nValue = blockValue;
        }
    }
    else if(!hasPayment && hasdevopsPay)
    {
        if(txNew.vout.size() == 4){ // 2 stake outputs, stake was split, plus a devops payment
            txNew.vout[devoppay-1].nValue = devopsPayment;
            blockValue -= devopsPayment;
            txNew.vout[1].nValue = (blockValue / 2 / CENT) * CENT;
            txNew.vout[2].nValue = blockValue - txNew.vout[1].nValue;
        }
        else if(txNew.vout.size() == 3){ // only 1 stake output, was not split, plus a devops payment
            txNew.vout[devoppay-1].nValue = devopsPayment;
            blockValue -= devopsPayment;
            txNew.vout[1].nValue = blockValue;
        }
    }
    else if(hasPayment && hasdevopsPay)
    {
        if(txNew.vout.size() == 5){ // 2 stake outputs, stake was split, plus a devops AND masternode payment
            txNew.vout[payments-1].nValue = masternodePayment;
            blockValue -= masternodePayment;
            txNew.vout[devoppay-1].nValue = devopsPayment;
            blockValue -= devopsPayment;
            txNew.vout[1].nValue = (blockValue / 2 / CENT) * CENT;
            txNew.vout[2].nValue = blockValue - txNew.vout[1].nValue;
        }
        else if(txNew.vout.size() == 4){ // only 1 stake output, was not split, plus a devops AND masternode payment
            txNew.vout[payments-1].nValue = masternodePayment;
            blockValue -= masternodePayment;
            txNew.vout[devoppay-1].nValue = devopsPayment;
            blockValue -= devopsPayment;
            txNew.vout[1].nValue = blockValue;
        }
    }

    // Sign
    int nIn = 0;
    BOOST_FOREACH(const CWalletTx* pcoin, vwtxPrev)
    {
        if (!SignSignature(*this, *pcoin, txNew, nIn++))
            return error("CreateCoinStake : failed to sign coinstake");
    }

    // Limit size
    unsigned int nBytes = ::GetSerializeSize(txNew, SER_NETWORK, PROTOCOL_VERSION);
    if (nBytes >= MAX_BLOCK_SIZE_GEN/5)
        return error("CreateCoinStake : exceeded coinstake size limit");

    // Successfully generated coinstake
    return true;
}


// Call after CreateTransaction unless you want to abort
bool CWallet::CommitTransaction(CWalletTx& wtxNew, CReserveKey& reservekey, std::string strCommand)
{
    mapValue_t mapNarr;
    FindStealthTransactions(wtxNew, mapNarr);

    if (!mapNarr.empty())
    {
        BOOST_FOREACH(const PAIRTYPE(string,string)& item, mapNarr)
            wtxNew.mapValue[item.first] = item.second;
    };

    {
        LOCK2(cs_main, cs_wallet);
        LogPrintf("CommitTransaction:\n%s", wtxNew.ToString());
        {
            // This is only to keep the database open to defeat the auto-flush for the
            // duration of this scope.  This is the only place where this optimization
            // maybe makes sense; please don't do it anywhere else.
            CWalletDB* pwalletdb = fFileBacked ? new CWalletDB(strWalletFile,"r") : NULL;

            // Take key pair from key pool so it won't be used again
            reservekey.KeepKey();

            // Add tx to wallet, because if it has change it's also ours,
            // otherwise just for transaction history.
            AddToWallet(wtxNew);

            // Mark old coins as spent
            set<CWalletTx*> setCoins;
            BOOST_FOREACH(const CTxIn& txin, wtxNew.vin)
            {
                CWalletTx &coin = mapWallet[txin.prevout.hash];
                coin.BindWallet(this);
                coin.MarkSpent(txin.prevout.n);
                coin.WriteToDisk();
                NotifyTransactionChanged(this, coin.GetHash(), CT_UPDATED);
            }

            if (fFileBacked)
                delete pwalletdb;
        }

        // Track how many getdata requests our transaction gets
        mapRequestCount[wtxNew.GetHash()] = 0;

        // Broadcast
        if (!wtxNew.AcceptToMemoryPool(false))
        {
            // This must not fail. The transaction has already been signed and recorded.
            LogPrintf("CommitTransaction() : Error: Transaction not valid\n");
            return false;
        }
        wtxNew.RelayWalletTransaction(strCommand);
    }
    return true;
}

bool CWallet::AddAccountingEntry(const CAccountingEntry& acentry, CWalletDB & pwalletdb)
{
    if (!pwalletdb.WriteAccountingEntry_Backend(acentry))
        return false;

    laccentries.push_back(acentry);
    CAccountingEntry & entry = laccentries.back();
    wtxOrdered.insert(make_pair(entry.nOrderPos, TxPair((CWalletTx*)0, &entry)));

    return true;
}

string CWallet::SendMoney(CScript scriptPubKey, int64_t nValue, std::string& sNarr, CWalletTx& wtxNew, bool fAskFee)
{
    CReserveKey reservekey(this);
    int64_t nFeeRequired;

    if (IsLocked())
    {
        string strError = _("Error: Wallet locked, unable to create transaction!");
        LogPrintf("SendMoney() : %s", strError);
        return strError;
    }
    if (fWalletUnlockStakingOnly)
    {
        string strError = _("Error: Wallet unlocked for staking only, unable to create transaction.");
        LogPrintf("SendMoney() : %s", strError);
        return strError;
    }

    CWalletTx wtx;
    std::vector<std::pair<CScript, int64_t> > vecSend;
    vecSend.push_back(make_pair(scriptPubKey, nValue));
    string strError = "";


    if (!CreateTransaction(scriptPubKey, nValue, sNarr, wtxNew, reservekey, nFeeRequired))
    {
        string strError;
        if (nValue + nFeeRequired > GetBalance())
            strError = strprintf(_("Error: This transaction requires a transaction fee of at least %s because of its amount, complexity, or use of recently received funds!"), FormatMoney(nFeeRequired));
        else
            strError = "Failed to Create transaction";

        LogPrintf("SendMoney() : %s\n", strError);
        return strError;
    }

    if (!CommitTransaction(wtxNew, reservekey))
        return _("Error: The transaction was rejected! This might happen if some of the coins in your wallet were already spent, such as if you used a copy of wallet.dat and coins were spent in the copy but not marked as spent here.");

    return "";
}



string CWallet::SendMoneyToDestination(const CTxDestination& address, int64_t nValue, std::string& sNarr, CWalletTx& wtxNew, bool fAskFee)
{
    // Check amount
    if (nValue <= 0)
        return _("Invalid amount");
    if (nValue + nTransactionFee > GetBalance())
        return _("Insufficient funds");

    // Parse Bungee address
    CScript scriptPubKey;
    scriptPubKey.SetDestination(address);

    return SendMoney(scriptPubKey, nValue, sNarr, wtxNew, fAskFee);
}

int64_t CWallet::GetTotalValue(std::vector<CTxIn> vCoins) {
    int64_t nTotalValue = 0;
    CWalletTx wtx;
    BOOST_FOREACH(CTxIn i, vCoins){
        if (mapWallet.count(i.prevout.hash))
        {
            CWalletTx& wtx = mapWallet[i.prevout.hash];
            if(i.prevout.n < wtx.vout.size()){
                nTotalValue += wtx.vout[i.prevout.n].nValue;
            }
        } else {
            LogPrintf("GetTotalValue -- Couldn't find transaction\n");
        }
    }
    return nTotalValue;
}

DBErrors CWallet::LoadWallet(bool& fFirstRunRet)
{
    if (!fFileBacked)
        return DB_LOAD_OK;
    fFirstRunRet = false;
    DBErrors nLoadWalletRet = CWalletDB(strWalletFile,"cr+").LoadWallet(this);
    if (nLoadWalletRet == DB_NEED_REWRITE)
    {
        if (CDB::Rewrite(strWalletFile, "\x04pool"))
        {
            LOCK(cs_wallet);
            setKeyPool.clear();
            // Note: can't top-up keypool here, because wallet is locked.
            // User will be prompted to unlock wallet the next operation
            // the requires a new key.
        }
    }

    if (nLoadWalletRet != DB_LOAD_OK)
        return nLoadWalletRet;
    fFirstRunRet = !vchDefaultKey.IsValid();

    return DB_LOAD_OK;
}


bool CWallet::SetAddressBookName(const CTxDestination& address, const string& strName)
{
    bool fUpdated = false;
    {
        LOCK(cs_wallet); // mapAddressBook
        std::map<CTxDestination, std::string>::iterator mi = mapAddressBook.find(address);
        fUpdated = mi != mapAddressBook.end();
        mapAddressBook[address] = strName;
    }
    NotifyAddressBookChanged(this, address, strName, ::IsMine(*this, address) != ISMINE_NO,
                             (fUpdated ? CT_UPDATED : CT_NEW) );
    if (!fFileBacked)
        return false;
    return CWalletDB(strWalletFile).WriteName(CBungeeAddress(address).ToString(), strName);
}

bool CWallet::DelAddressBookName(const CTxDestination& address)
{
    {
        LOCK(cs_wallet); // mapAddressBook

        mapAddressBook.erase(address);
    }

    NotifyAddressBookChanged(this, address, "", ::IsMine(*this, address) != ISMINE_NO, CT_DELETED);

    if (!fFileBacked)
        return false;
    CWalletDB(strWalletFile).EraseName(CBungeeAddress(address).ToString());
    return CWalletDB(strWalletFile).EraseName(CBungeeAddress(address).ToString());
}

bool CWallet::GetTransaction(const uint256 &hashTx, CWalletTx& wtx)
{
    {
        LOCK(cs_wallet);
        map<uint256, CWalletTx>::iterator mi = mapWallet.find(hashTx);
        if (mi != mapWallet.end())
        {
            wtx = (*mi).second;
            return true;
        }
    }
    return false;
}

bool CWallet::SetDefaultKey(const CPubKey &vchPubKey)
{
    if (fFileBacked)
    {
        if (!CWalletDB(strWalletFile).WriteDefaultKey(vchPubKey))
            return false;
    }
    vchDefaultKey = vchPubKey;
    return true;
}

//
// Mark old keypool keys as used,
// and generate all new keys
//
bool CWallet::NewKeyPool()
{
    {
        LOCK(cs_wallet);
        CWalletDB walletdb(strWalletFile);
        BOOST_FOREACH(int64_t nIndex, setKeyPool)
            walletdb.ErasePool(nIndex);
        setKeyPool.clear();

        if (IsLocked())
            return false;

        fLiteMode = GetBoolArg("-litemode", false);
        int64_t nKeys;

        if (fLiteMode)
            nKeys = max(GetArg("-keypool", 100), (int64_t)0);
        else
            nKeys = max(GetArg("-keypool", 1000), (int64_t)0);

        for (int i = 0; i < nKeys; i++)
        {
            int64_t nIndex = i+1;
            walletdb.WritePool(nIndex, CKeyPool(GenerateNewKey()));
            setKeyPool.insert(nIndex);
        }
        LogPrintf("CWallet::NewKeyPool wrote %d new keys\n", nKeys);
    }
    return true;
}

bool CWallet::TopUpKeyPool(unsigned int nSize)
{
    {
        LOCK(cs_wallet);

        if (IsLocked())
            return false;

        CWalletDB walletdb(strWalletFile);

        // Top up key pool
        unsigned int nTargetSize;
        fLiteMode = GetBoolArg("-litemode", false);

        if (nSize > 0)
            nTargetSize = nSize;
        else if (fLiteMode)
            nTargetSize = max(GetArg("-keypool", 100), (int64_t)0);
        else
            nTargetSize = max(GetArg("-keypool", 1000), (int64_t)0);

        while (setKeyPool.size() < (nTargetSize + 1))
        {
            int64_t nEnd = 1;
            if (!setKeyPool.empty())
                nEnd = *(--setKeyPool.end()) + 1;
            if (!walletdb.WritePool(nEnd, CKeyPool(GenerateNewKey())))
                throw runtime_error("TopUpKeyPool() : writing generated key failed");
            setKeyPool.insert(nEnd);
            LogPrintf("keypool added key %d, size=%u\n", nEnd, setKeyPool.size());
            double dProgress = 100.f * nEnd / (nTargetSize + 1);
            std::string strMsg = strprintf(_("Loading wallet... (%3.2f %%)"), dProgress);
            uiInterface.InitMessage(strMsg);
        }
    }
    return true;
}


void CWallet::ReserveKeyFromKeyPool(int64_t& nIndex, CKeyPool& keypool)
{
    nIndex = -1;
    keypool.vchPubKey = CPubKey();
    {
        LOCK(cs_wallet);

        if (!IsLocked())
            TopUpKeyPool();

        // Get the oldest key
        if(setKeyPool.empty())
            return;

        CWalletDB walletdb(strWalletFile);

        nIndex = *(setKeyPool.begin());
        setKeyPool.erase(setKeyPool.begin());
        if (!walletdb.ReadPool(nIndex, keypool))
            throw runtime_error("ReserveKeyFromKeyPool() : read failed");
        if (!HaveKey(keypool.vchPubKey.GetID()))
            throw runtime_error("ReserveKeyFromKeyPool() : unknown key in key pool");
        assert(keypool.vchPubKey.IsValid());
        LogPrintf("keypool reserve %d\n", nIndex);
    }
}

int64_t CWallet::AddReserveKey(const CKeyPool& keypool)
{
    {
        LOCK2(cs_main, cs_wallet);
        CWalletDB walletdb(strWalletFile);

        int64_t nIndex = 1 + *(--setKeyPool.end());
        if (!walletdb.WritePool(nIndex, keypool))
            throw runtime_error("AddReserveKey() : writing added key failed");
        setKeyPool.insert(nIndex);
        return nIndex;
    }
    return -1;
}

void CWallet::KeepKey(int64_t nIndex)
{
    // Remove from key pool
    if (fFileBacked)
    {
        CWalletDB walletdb(strWalletFile);
        walletdb.ErasePool(nIndex);
    }
    LogPrintf("keypool keep %d\n", nIndex);
}

void CWallet::ReturnKey(int64_t nIndex)
{
    // Return to key pool
    {
        LOCK(cs_wallet);
        setKeyPool.insert(nIndex);
    }
    LogPrintf("keypool return %d\n", nIndex);
}

bool CWallet::GetKeyFromPool(CPubKey& result)
{
    int64_t nIndex = 0;
    CKeyPool keypool;
    {
        LOCK(cs_wallet);
        ReserveKeyFromKeyPool(nIndex, keypool);
        if (nIndex == -1)
        {
            if (IsLocked()) return false;
            result = GenerateNewKey();
            return true;
        }
        KeepKey(nIndex);
        result = keypool.vchPubKey;
    }
    return true;
}

int64_t CWallet::GetOldestKeyPoolTime()
{
    int64_t nIndex = 0;
    CKeyPool keypool;
    ReserveKeyFromKeyPool(nIndex, keypool);
    if (nIndex == -1)
        return GetTime();
    ReturnKey(nIndex);
    return keypool.nTime;
}

std::map<CTxDestination, int64_t> CWallet::GetAddressBalances()
{
    map<CTxDestination, int64_t> balances;

    {
        LOCK(cs_wallet);
        BOOST_FOREACH(PAIRTYPE(uint256, CWalletTx) walletEntry, mapWallet)
        {
            CWalletTx *pcoin = &walletEntry.second;

            if (!IsFinalTx(*pcoin) || !pcoin->IsTrusted())
                continue;

            if ((pcoin->IsCoinBase() || pcoin->IsCoinStake()) && pcoin->GetBlocksToMaturity() > 0)
                continue;

            int nDepth = pcoin->GetDepthInMainChain();
            if (nDepth < (pcoin->IsFromMe(ISMINE_ALL) ? 0 : 1))
                continue;

            for (unsigned int i = 0; i < pcoin->vout.size(); i++)
            {
                CTxDestination addr;
                if (!IsMine(pcoin->vout[i]))
                    continue;
                if(!ExtractDestination(pcoin->vout[i].scriptPubKey, addr))
                    continue;

                int64_t n = pcoin->IsSpent(i) ? 0 : pcoin->vout[i].nValue;

                if (!balances.count(addr))
                    balances[addr] = 0;
                balances[addr] += n;
            }
        }
    }

    return balances;
}

set< set<CTxDestination> > CWallet::GetAddressGroupings()
{
    AssertLockHeld(cs_wallet); // mapWallet
    set< set<CTxDestination> > groupings;
    set<CTxDestination> grouping;

    BOOST_FOREACH(PAIRTYPE(uint256, CWalletTx) walletEntry, mapWallet)
    {
        CWalletTx *pcoin = &walletEntry.second;

        if (pcoin->vin.size() > 0 && IsMine(pcoin->vin[0]))
        {
            bool any_mine = false;
            // group all input addresses with each other
            BOOST_FOREACH(CTxIn txin, pcoin->vin)
            {
                CTxDestination address;
                if(!IsMine(txin)) /* If this input isn't mine, ignore it */
                    continue;
                if(!ExtractDestination(mapWallet[txin.prevout.hash].vout[txin.prevout.n].scriptPubKey, address))
                    continue;
                grouping.insert(address);
                any_mine = true;
            }

            // group change with input addresses
            if (any_mine)
            {
                BOOST_FOREACH(CTxOut txout, pcoin->vout)
                {
                    if (IsChange(txout))
                    {
                        CWalletTx tx = mapWallet[pcoin->vin[0].prevout.hash];
                        CTxDestination txoutAddr;
                        if(!ExtractDestination(txout.scriptPubKey, txoutAddr))
                            continue;
                        grouping.insert(txoutAddr);
                    }
                }
            }
            if (grouping.size() > 0)
            {
                groupings.insert(grouping);
                grouping.clear();
            }
        }

        // group lone addrs by themselves
        for (unsigned int i = 0; i < pcoin->vout.size(); i++)
            if (IsMine(pcoin->vout[i]))
            {
                CTxDestination address;
                if(!ExtractDestination(pcoin->vout[i].scriptPubKey, address))
                    continue;
                grouping.insert(address);
                groupings.insert(grouping);
                grouping.clear();
            }
    }

    set< set<CTxDestination>* > uniqueGroupings; // a set of pointers to groups of addresses
    map< CTxDestination, set<CTxDestination>* > setmap;  // map addresses to the unique group containing it
    BOOST_FOREACH(set<CTxDestination> grouping, groupings)
    {
        // make a set of all the groups hit by this new group
        set< set<CTxDestination>* > hits;
        map< CTxDestination, set<CTxDestination>* >::iterator it;
        BOOST_FOREACH(CTxDestination address, grouping)
            if ((it = setmap.find(address)) != setmap.end())
                hits.insert((*it).second);

        // merge all hit groups into a new single group and delete old groups
        set<CTxDestination>* merged = new set<CTxDestination>(grouping);
        BOOST_FOREACH(set<CTxDestination>* hit, hits)
        {
            merged->insert(hit->begin(), hit->end());
            uniqueGroupings.erase(hit);
            delete hit;
        }
        uniqueGroupings.insert(merged);

        // update setmap
        BOOST_FOREACH(CTxDestination element, *merged)
            setmap[element] = merged;
    }

    set< set<CTxDestination> > ret;
    BOOST_FOREACH(set<CTxDestination>* uniqueGrouping, uniqueGroupings)
    {
        ret.insert(*uniqueGrouping);
        delete uniqueGrouping;
    }

    return ret;
}

// ppcoin: check 'spent' consistency between wallet and txindex
// ppcoin: fix wallet spent state according to txindex
void CWallet::FixSpentCoins(int& nMismatchFound, int64_t& nBalanceInQuestion, bool fCheckOnly)
{
    nMismatchFound = 0;
    nBalanceInQuestion = 0;

    LOCK(cs_wallet);
    vector<CWalletTx*> vCoins;
    vCoins.reserve(mapWallet.size());
    for (map<uint256, CWalletTx>::iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
        vCoins.push_back(&(*it).second);

    CTxDB txdb("r");
    BOOST_FOREACH(CWalletTx* pcoin, vCoins)
    {
        // Find the corresponding transaction index
        CTxIndex txindex;
        if (!txdb.ReadTxIndex(pcoin->GetHash(), txindex))
            continue;
        for (unsigned int n=0; n < pcoin->vout.size(); n++)
        {
            if (IsMine(pcoin->vout[n]) && pcoin->IsSpent(n) && (txindex.vSpent.size() <= n || txindex.vSpent[n].IsNull()))
            {
                LogPrintf("FixSpentCoins found lost coin %s XBNG %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 XBNG %s[%d], %s\n",
                    FormatMoney(pcoin->vout[n].nValue), pcoin->GetHash().ToString(), n, fCheckOnly? "repair not attempted" : "repairing");
                nMismatchFound++;
                nBalanceInQuestion += pcoin->vout[n].nValue;
                if (!fCheckOnly)
                {
                    pcoin->MarkSpent(n);
                    pcoin->WriteToDisk();
                }
            }
        }
    }
}

// ppcoin: disable transaction (only for coinstake)
void CWallet::DisableTransaction(const CTransaction &tx)
{
    if (!tx.IsCoinStake() || !IsFromMe(tx))
        return; // only disconnecting coinstake requires marking input unspent

    LOCK(cs_wallet);
    BOOST_FOREACH(const CTxIn& txin, tx.vin)
    {
        map<uint256, CWalletTx>::iterator mi = mapWallet.find(txin.prevout.hash);
        if (mi != mapWallet.end())
        {
            CWalletTx& prev = (*mi).second;
            if (txin.prevout.n < prev.vout.size() && IsMine(prev.vout[txin.prevout.n]))
            {
                prev.MarkUnspent(txin.prevout.n);
                prev.WriteToDisk();
            }
        }
    }
}

bool CReserveKey::GetReservedKey(CPubKey& pubkey)
{
    if (nIndex == -1)
    {
        CKeyPool keypool;
        pwallet->ReserveKeyFromKeyPool(nIndex, keypool);
        if (nIndex != -1)
            vchPubKey = keypool.vchPubKey;
        else {
            if (pwallet->vchDefaultKey.IsValid()) {
                LogPrintf("CReserveKey::GetReservedKey(): Warning: Using default key instead of a new key, top up your keypool!");
                vchPubKey = pwallet->vchDefaultKey;
            } else
                return false;
        }
    }
    assert(vchPubKey.IsValid());
    pubkey = vchPubKey;
    return true;
}

void CReserveKey::KeepKey()
{
    if (nIndex != -1)
        pwallet->KeepKey(nIndex);
    nIndex = -1;
    vchPubKey = CPubKey();
}

void CReserveKey::ReturnKey()
{
    if (nIndex != -1)
        pwallet->ReturnKey(nIndex);
    nIndex = -1;
    vchPubKey = CPubKey();
}

void CWallet::GetAllReserveKeys(set<CKeyID>& setAddress) const
{
    setAddress.clear();

    CWalletDB walletdb(strWalletFile);

    LOCK2(cs_main, cs_wallet);
    BOOST_FOREACH(const int64_t& id, setKeyPool)
    {
        CKeyPool keypool;
        if (!walletdb.ReadPool(id, keypool))
            throw runtime_error("GetAllReserveKeyHashes() : read failed");
        assert(keypool.vchPubKey.IsValid());
        CKeyID keyID = keypool.vchPubKey.GetID();
        if (!HaveKey(keyID))
            throw runtime_error("GetAllReserveKeyHashes() : unknown key in key pool");
        setAddress.insert(keyID);
    }
}

bool CWallet::UpdatedTransaction(const uint256 &hashTx)
{
    {
        LOCK(cs_wallet);
        // Only notify UI if this transaction is in this wallet
        map<uint256, CWalletTx>::const_iterator mi = mapWallet.find(hashTx);
        if (mi != mapWallet.end()){
            NotifyTransactionChanged(this, hashTx, CT_UPDATED);
            return true;
        }
    }
    return false;
}

void CWallet::LockCoin(COutPoint& output)
{
    AssertLockHeld(cs_wallet); // setLockedCoins
    setLockedCoins.insert(output);
}

void CWallet::UnlockCoin(COutPoint& output)
{
    AssertLockHeld(cs_wallet); // setLockedCoins
    setLockedCoins.erase(output);
}

void CWallet::UnlockAllCoins()
{
    AssertLockHeld(cs_wallet); // setLockedCoins
    setLockedCoins.clear();
}

bool CWallet::IsLockedCoin(uint256 hash, unsigned int n) const
{
    AssertLockHeld(cs_wallet); // setLockedCoins
    COutPoint outpt(hash, n);

    return (setLockedCoins.count(outpt) > 0);
}

void CWallet::ListLockedCoins(std::vector<COutPoint>& vOutpts)
{
    AssertLockHeld(cs_wallet); // setLockedCoins
    for (std::set<COutPoint>::iterator it = setLockedCoins.begin();
         it != setLockedCoins.end(); it++) {
        COutPoint outpt = (*it);
        vOutpts.push_back(outpt);
    }
}

void CWallet::GetKeyBirthTimes(std::map<CKeyID, int64_t> &mapKeyBirth) const {
    AssertLockHeld(cs_wallet); // mapKeyMetadata
    mapKeyBirth.clear();

    // get birth times for keys with metadata
    for (std::map<CKeyID, CKeyMetadata>::const_iterator it = mapKeyMetadata.begin(); it != mapKeyMetadata.end(); it++)
        if (it->second.nCreateTime)
            mapKeyBirth[it->first] = it->second.nCreateTime;

    // map in which we'll infer heights of other keys
    CBlockIndex *pindexMax = FindBlockByHeight(std::max(0, nBestHeight - 144)); // the tip can be reorganised; use a 144-block safety margin
    std::map<CKeyID, CBlockIndex*> mapKeyFirstBlock;
    std::set<CKeyID> setKeys;
    GetKeys(setKeys);
    BOOST_FOREACH(const CKeyID &keyid, setKeys) {
        if (mapKeyBirth.count(keyid) == 0)
            mapKeyFirstBlock[keyid] = pindexMax;
    }
    setKeys.clear();

    // if there are no such keys, we're done
    if (mapKeyFirstBlock.empty())
        return;

    // find first block that affects those keys, if there are any left
    std::vector<CKeyID> vAffected;
    for (std::map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); it++) {
        // iterate over all wallet transactions...
        const CWalletTx &wtx = (*it).second;
        std::map<uint256, CBlockIndex*>::const_iterator blit = mapBlockIndex.find(wtx.hashBlock);
        if (blit != mapBlockIndex.end() && blit->second->IsInMainChain()) {
            // ... which are already in a block
            int nHeight = blit->second->nHeight;
            BOOST_FOREACH(const CTxOut &txout, wtx.vout) {
                // iterate over all their outputs
                ::ExtractAffectedKeys(*this, txout.scriptPubKey, vAffected);
                BOOST_FOREACH(const CKeyID &keyid, vAffected) {
                    // ... and all their affected keys
                    std::map<CKeyID, CBlockIndex*>::iterator rit = mapKeyFirstBlock.find(keyid);
                    if (rit != mapKeyFirstBlock.end() && nHeight < rit->second->nHeight)
                        rit->second = blit->second;
                }
                vAffected.clear();
            }
        }
    }

    // Extract block timestamps for those keys
    for (std::map<CKeyID, CBlockIndex*>::const_iterator it = mapKeyFirstBlock.begin(); it != mapKeyFirstBlock.end(); it++)
        mapKeyBirth[it->first] = it->second->nTime - 7200; // block times can be 2h off
}

bool CWallet::ImportPrivateKey(CBungeeSecret vchSecret, string strLabel, bool fRescan) {
    if (fWalletUnlockStakingOnly)
        return false;

    CKey key = vchSecret.GetKey();
    CPubKey pubkey = key.GetPubKey();
    assert(key.VerifyPubKey(pubkey));
    CKeyID vchAddress = pubkey.GetID();
    {
        LOCK2(cs_main, cs_wallet);

        MarkDirty();
        SetAddressBookName(vchAddress, strLabel);

        // Don't throw error in case a key is already there
        if (HaveKey(vchAddress))
            return true;

        mapKeyMetadata[vchAddress].nCreateTime = 1;

        if (!AddKeyPubKey(key, pubkey))
            return false;

        // whenever a key is imported, we need to scan the whole chain
        nTimeFirstKey = 1; // 0 would be considered 'no value'

        if (fRescan) {
            ScanForWalletTransactions(pindexGenesisBlock, true);
            ReacceptWalletTransactions();
        }
    }

    return true;
}
