dash/src/wallet.cpp

// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2014 The Bitcoin developers
// Copyright (c) 2014-2015 The Dash developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include "wallet.h"

#include "base58.h"
#include "checkpoints.h"
#include "coincontrol.h"
#include "net.h"
#include "masternode-budget.h"
#include "darksend.h"
#include "keepass.h"
#include "instantx.h"
#include "script/script.h"
#include "script/sign.h"
#include "spork.h"
#include "timedata.h"
#include "util.h"
#include "utilmoneystr.h"

#include <assert.h>

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


using namespace std;

/**
 * Settings
 */
CFeeRate payTxFee(DEFAULT_TRANSACTION_FEE);
CAmount maxTxFee = DEFAULT_TRANSACTION_MAXFEE;
unsigned int nTxConfirmTarget = 1;
bool bSpendZeroConfChange = true;
bool fSendFreeTransactions = false;
bool fPayAtLeastCustomFee = true;

/** 
 * Fees smaller than this (in duffs) are considered zero fee (for transaction creation)
 * We are ~100 times smaller then bitcoin now (2015-06-23), set minTxFee 10 times higher
 * so it's still 10 times lower comparing to bitcoin.
 * Override with -mintxfee
 */
CFeeRate CWallet::minTxFee = CFeeRate(10000);

/** @defgroup mapWallet
 *
 * @{
 */

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

std::string COutput::ToString() const
{
    return strprintf("COutput(%s, %d, %d) [%s]", tx->GetHash().ToString(), i, nDepth, FormatMoney(tx->vout[i].nValue));
}

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

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

    RandAddSeedPerfmon();
    CKey secret;
    secret.MakeNewKey(fCompressed);

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

    CPubKey pubkey = secret.GetPubKey();
    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);
}

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

    return CCryptoKeyStore::AddCScript(redeemScript);
}

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

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

    return true;
}

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

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

    if (!IsLocked())
    {
        fWalletUnlockAnonymizeOnly = anonymizeOnly;
        return true;
    }

    // Verify KeePassIntegration
    if(strWalletPassphrase == "keepass" && GetBoolArg("-keepass", false)) {
        try {
            strWalletPassphraseFinal = keePassInt.retrievePassphrase();
        } catch (std::exception& e) {
            LogPrintf("CWallet::Unlock could not retrieve passphrase from KeePass: Error: %s\n", e.what());
            return false;
        }
    } else {
        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))
                continue; // try another master key
            if (CCryptoKeyStore::Unlock(vMasterKey))
            {
                fWalletUnlockAnonymizeOnly = anonymizeOnly;
                return true;
            }
        }
    }
    return false;
}

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

    SecureString strOldWalletPassphraseFinal;

    // Verify KeePassIntegration
    if(strOldWalletPassphrase == "keepass" && GetBoolArg("-keepass", false)) {
        bUseKeePass = true;
        try {
            strOldWalletPassphraseFinal = keePassInt.retrievePassphrase();
        } catch (std::exception& e) {
            LogPrintf("CWallet::ChangeWalletPassphrase could not retrieve passphrase from KeePass: Error: %s\n", e.what());
            return false;
        }
    } else {
        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))
            {
                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();

                // Update KeePass if necessary
                if(bUseKeePass) {
                    LogPrintf("CWallet::ChangeWalletPassphrase - Updating KeePass with new passphrase");
                    try {
                        keePassInt.updatePassphrase(strNewWalletPassphrase);
                    } catch (std::exception& e) {
                        LogPrintf("CWallet::ChangeWalletPassphrase - could not update passphrase in KeePass: Error: %s\n", e.what());
                        return false;
                    }
                }

                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);
    GetRandBytes(&vMasterKey[0], WALLET_CRYPTO_KEY_SIZE);

    CMasterKey kMasterKey;
    RandAddSeedPerfmon();

    kMasterKey.vchSalt.resize(WALLET_CRYPTO_SALT_SIZE);
    GetRandBytes(&kMasterKey.vchSalt[0], WALLET_CRYPTO_SALT_SIZE);

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

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

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

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

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

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

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

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

        if (fFileBacked)
        {
            if (!pwalletdbEncryption->TxnCommit()) {
                delete pwalletdbEncryption;
                // We now have keys encrypted in memory, but not on disk...
                // die to avoid confusion and let the user reload their unencrypted wallet.
                assert(false);
            }

            delete pwalletdbEncryption;
            pwalletdbEncryption = NULL;
        }

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

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

        // Update KeePass if necessary
        if(GetBoolArg("-keepass", false)) {
            LogPrintf("CWallet::EncryptWallet - Updating KeePass with new passphrase");
            try {
                keePassInt.updatePassphrase(strWalletPassphrase);
            } catch (std::exception& e) {
                LogPrintf("CWallet::EncryptWallet - could not update passphrase in KeePass: Error: %s\n", e.what());
            }
        }

    }
    NotifyStatusChanged(this);

    return true;
}

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

CWallet::TxItems CWallet::OrderedTxItems(std::list<CAccountingEntry>& acentries, std::string strAccount)
{
    AssertLockHeld(cs_wallet); // mapWallet
    CWalletDB walletdb(strWalletFile);

    // First: get all CWalletTx and CAccountingEntry into a sorted-by-order multimap.
    TxItems txOrdered;

    // Note: maintaining indices in the database of (account,time) --> txid and (account, time) --> acentry
    // would make this much faster for applications that do this a lot.
    for (map<uint256, CWalletTx>::iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
    {
        CWalletTx* wtx = &((*it).second);
        txOrdered.insert(make_pair(wtx->nOrderPos, TxPair(wtx, (CAccountingEntry*)0)));
    }
    acentries.clear();
    walletdb.ListAccountCreditDebit(strAccount, acentries);
    BOOST_FOREACH(CAccountingEntry& entry, acentries)
    {
        txOrdered.insert(make_pair(entry.nOrderPos, TxPair((CWalletTx*)0, &entry)));
    }

    return txOrdered;
}

void CWallet::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;
        mapWallet[hash].BindWallet(this);
        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();

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

                    int64_t blocktime = mapBlockIndex[wtxIn.hashBlock]->GetBlockTime();
                    wtx.nTimeSmart = std::max(latestEntry, std::min(blocktime, latestNow));
                }
                else
                    LogPrintf("AddToWallet() : found %s in block %s not in index\n",
                             wtxIn.GetHash().ToString(),
                             wtxIn.hashBlock.ToString());
            }
            AddToSpends(hash);
        }

        bool fUpdated = false;
        if (!fInsertedNew)
        {
            // Merge
            if (wtxIn.hashBlock != 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;
            }
        }

        //// 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)
{
    {
        AssertLockHeld(cs_wallet);
        bool fExisted = mapWallet.count(tx.GetHash()) != 0;
        if (fExisted && !fUpdate) return false;
        if (fExisted || IsMine(tx) || IsFromMe(tx))
        {
            CWalletTx wtx(this,tx);
            // Get merkle branch if transaction was found in a block
            if (pblock)
                wtx.SetMerkleBranch(*pblock);
            return AddToWallet(wtx);
        }
    }
    return false;
}

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

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

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

bool CWallet::IsDenominatedAmount(int64_t nInputAmount) const
{
    BOOST_FOREACH(int64_t d, darkSendDenominations)
        if(nInputAmount == d)
            return true;
    return false;
}

bool CWallet::IsChange(const CTxOut& txout) const
{
    // 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())
        {
            // 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<COutputEntry>& listReceived,
                           list<COutputEntry>& listSent, CAmount& nFee, string& strSentAccount, const isminefilter& filter) const
{
    nFee = 0;
    listReceived.clear();
    listSent.clear();
    strSentAccount = strFromAccount;

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

    // Sent/received.
    for (unsigned int i = 0; i < vout.size(); ++i)
    {
        const CTxOut& txout = vout[i];
        isminetype fIsMine = pwallet->IsMine(txout);
        // Only need to handle txouts if AT LEAST one of these is true:
        //   1) they debit from us (sent)
        //   2) the output is to us (received)
        if (nDebit > 0)
        {
            // Don't report 'change' txouts
            if (pwallet->IsChange(txout))
                continue;
        }
        else if (!(fIsMine & filter))
            continue;

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

        COutputEntry output = {address, txout.nValue, (int)i};

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

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

}

void CWalletTx::GetAccountAmounts(const string& strAccount, CAmount& nReceived,
                                  CAmount& nSent, CAmount& nFee, const isminefilter& filter) const
{
    nReceived = nSent = nFee = 0;

    CAmount allFee;
    string strSentAccount;
    list<COutputEntry> listReceived;
    list<COutputEntry> listSent;
    GetAmounts(listReceived, listSent, allFee, strSentAccount, filter);

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


bool CWalletTx::WriteToDisk()
{
    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;
    int64_t nNow = GetTime();

    CBlockIndex* pindex = pindexStart;
    {
        LOCK2(cs_main, cs_wallet);

        // no need to read and scan block, if block was created before
        // our wallet birthday (as adjusted for block time variability)
        while (pindex && nTimeFirstKey && (pindex->GetBlockTime() < (nTimeFirstKey - 7200)))
            pindex = chainActive.Next(pindex);

        ShowProgress(_("Rescanning..."), 0); // show rescan progress in GUI as dialog or on splashscreen, if -rescan on startup
        double dProgressStart = Checkpoints::GuessVerificationProgress(pindex, false);
        double dProgressTip = Checkpoints::GuessVerificationProgress(chainActive.Tip(), false);
        while (pindex)
        {
            if (pindex->nHeight % 100 == 0 && dProgressTip - dProgressStart > 0.0)
                ShowProgress(_("Rescanning..."), std::max(1, std::min(99, (int)((Checkpoints::GuessVerificationProgress(pindex, false) - dProgressStart) / (dProgressTip - dProgressStart) * 100))));

            CBlock block;
            ReadBlockFromDisk(block, pindex);
            BOOST_FOREACH(CTransaction& tx, block.vtx)
            {
                if (AddToWalletIfInvolvingMe(tx, &block, fUpdate))
                    ret++;
            }
            pindex = chainActive.Next(pindex);
            if (GetTime() >= nNow + 60) {
                nNow = GetTime();
                LogPrintf("Still rescanning. At block %d. Progress=%f\n", pindex->nHeight, Checkpoints::GuessVerificationProgress(pindex));
            }
        }
        ShowProgress(_("Rescanning..."), 100); // hide progress dialog in GUI
    }
    return ret;
}

void CWallet::ReacceptWalletTransactions()
{
    LOCK2(cs_main, cs_wallet);
    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);
        }
    }
}

void CWalletTx::RelayWalletTransaction(std::string strCommand)
{
    if (!IsCoinBase())
    {
        if (GetDepthInMainChain() == 0) {
            uint256 hash = GetHash();
            LogPrintf("Relaying wtx %s\n", hash.ToString());

            if(strCommand == "ix"){
                mapTxLockReq.insert(make_pair(hash, (CTransaction)*this));
                CreateNewLock(((CTransaction)*this));
                RelayTransactionLockReq((CTransaction)*this, true);
            } else {
                RelayTransaction((CTransaction)*this);
            }
        }
    }
}

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()
{
    // Do this infrequently and randomly to avoid giving away
    // that these are our transactions.
    if (GetTime() < nNextResend)
        return;
    bool fFirst = (nNextResend == 0);
    nNextResend = GetTime() + GetRand(30 * 60);
    if (fFirst)
        return;

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

    // Rebroadcast any of our txes that aren't in a block yet
    LogPrintf("ResendWalletTransactions()\n");
    {
        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 (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();
        }
    }
}

/** @} */ // end of mapWallet




/** @defgroup Actions
 *
 * @{
 */


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

    return nTotal;
}

CAmount CWallet::GetAnonymizableBalance(bool includeAlreadyAnonymized) const
{
    if(fLiteMode) return 0;

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

            if (pcoin->IsTrusted())
            {
                uint256 hash = (*it).first;
                for (unsigned int i = 0; i < pcoin->vout.size(); i++)
                {
                    CTxIn vin = CTxIn(hash, i);

                    if(IsSpent(hash, i) || !IsMine(pcoin->vout[i])) continue;
                    if (pcoin->IsCoinBase() && pcoin->GetBlocksToMaturity() > 0) continue; // do not count immature
                    if(pcoin->vout[i].nValue == 1000*COIN) continue; // do not count MN-like outputs

                    int rounds = GetInputDarksendRounds(vin);
                    if(rounds >=-2 && (rounds < nDarksendRounds || (includeAlreadyAnonymized && rounds >= nDarksendRounds))) {
                        nTotal += pcoin->vout[i].nValue;
                    }
                }
            }
        }
    }

    return nTotal;
}

CAmount CWallet::GetAnonymizedBalance() const
{
    if(fLiteMode) return 0;

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

            if (pcoin->IsTrusted())
            {
                uint256 hash = (*it).first;
                for (unsigned int i = 0; i < pcoin->vout.size(); i++)
                {
                    CTxIn vin = CTxIn(hash, i);

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

                    int rounds = GetInputDarksendRounds(vin);
                    if(rounds >= nDarksendRounds){
                        nTotal += pcoin->vout[i].nValue;
                    }
                }
            }
        }
    }

    return nTotal;
}

// Note: calculated including unconfirmed,
// that's ok as long as we use it for informational purposes only
double CWallet::GetAverageAnonymizedRounds() const
{
    double fTotal = 0;
    double fCount = 0;

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

            uint256 hash = (*it).first;

            for (unsigned int i = 0; i < pcoin->vout.size(); i++) {

                CTxIn vin = CTxIn(hash, i);

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

                int rounds = GetInputDarksendRounds(vin);
                fTotal += (float)rounds;
                fCount += 1;
            }
        }
    }

    if(fCount == 0) return 0;

    return fTotal/fCount;
}

// Note: calculated including unconfirmed,
// that's ok as long as we use it for informational purposes only
CAmount CWallet::GetNormalizedAnonymizedBalance() 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;

            uint256 hash = (*it).first;

            for (unsigned int i = 0; i < pcoin->vout.size(); i++) {

                CTxIn vin = CTxIn(hash, i);

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

                int rounds = GetInputDarksendRounds(vin);
                nTotal += pcoin->vout[i].nValue * rounds / nDarksendRounds;
            }
        }
    }

    return nTotal;
}

CAmount CWallet::GetDenominatedBalance(bool denom, bool unconfirmed, bool includeAlreadyAnonymized) 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;

            int nDepth = pcoin->GetDepthInMainChain(false);

            // skip conflicted
            if(nDepth < 0) continue;

            bool isUnconfirmed = (!IsFinalTx(*pcoin) || (!pcoin->IsTrusted() && nDepth == 0));
            if(unconfirmed != isUnconfirmed) continue;
            uint256 hash = (*it).first;

            for (unsigned int i = 0; i < pcoin->vout.size(); i++)
            {
                if(IsSpent(hash, i)) continue;
                if(!IsMine(pcoin->vout[i])) continue;
                if(denom != IsDenominatedAmount(pcoin->vout[i].nValue)) continue;

                CTxIn vin = CTxIn(hash, i);
                int rounds = GetInputDarksendRounds(vin);
                if(!includeAlreadyAnonymized && rounds >= nDarksendRounds) continue;

                nTotal += pcoin->vout[i].nValue;
            }
        }
    }



    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::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 uint256& wtxid = it->first;
            const CWalletTx* pcoin = &(*it).second;

            if (!IsFinalTx(*pcoin))
                continue;

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

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

            int nDepth = pcoin->GetDepthInMainChain(false);
            // do not use IX for inputs that have less then 6 blockchain confirmations
            if (useIX && nDepth < 6)
                continue;

            for (unsigned int i = 0; i < pcoin->vout.size(); i++) {
                bool found = false;
                if(coin_type == ONLY_DENOMINATED) {
                    //should make this a vector

                    found = IsDenominatedAmount(pcoin->vout[i].nValue);
                } else if(coin_type == ONLY_NONDENOMINATED || coin_type == ONLY_NONDENOMINATED_NOTMN) {
                    found = true;
                    if (IsCollateralAmount(pcoin->vout[i].nValue)) continue; // do not use collateral amounts
                    found = !IsDenominatedAmount(pcoin->vout[i].nValue);
                    if(found && coin_type == ONLY_NONDENOMINATED_NOTMN) found = (pcoin->vout[i].nValue != 1000*COIN); // do not use MN funds
                } else {
                    found = true;
                }
                if(!found) continue;

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

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

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

    seed_insecure_rand();

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


// TODO: find appropriate place for this sort function
// move denoms down
bool less_then_denom (const COutput& out1, const COutput& out2)
{
    const CWalletTx *pcoin1 = out1.tx;
    const CWalletTx *pcoin2 = out2.tx;

    bool found1 = false;
    bool found2 = false;
    BOOST_FOREACH(int64_t d, darkSendDenominations) // loop through predefined denoms
    {
        if(pcoin1->vout[out1.i].nValue == d) found1 = true;
        if(pcoin2->vout[out2.i].nValue == d) found2 = true;
    }
    return (!found1 && found2);
}

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

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

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

    // move denoms down on the list
    sort(vCoins.begin(), vCoins.end(), less_then_denom);

    // try to find nondenom first to prevent unneeded spending of mixed coins
    for (unsigned int tryDenom = 0; tryDenom < 2; tryDenom++)
    {
        if (fDebug) LogPrint("selectcoins", "tryDenom: %d\n", tryDenom);
        vValue.clear();
        nTotalLower = 0;
        BOOST_FOREACH(const COutput &output, vCoins)
        {
            if (!output.fSpendable)
                continue;

            const CWalletTx *pcoin = output.tx;

//            if (fDebug) LogPrint("selectcoins", "value %s confirms %d\n", FormatMoney(pcoin->vout[output.i].nValue), output.nDepth);
            if (output.nDepth < (pcoin->IsFromMe(ISMINE_ALL) ? nConfMine : nConfTheirs))
                continue;

            int i = output.i;
            CAmount n = pcoin->vout[i].nValue;
            if (tryDenom == 0 && IsDenominatedAmount(n)) continue; // we don't want denom values on first run

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

            if (n == nTargetValue)
            {
                setCoinsRet.insert(coin.second);
                nValueRet += coin.first;
                return true;
            }
            else if (n < nTargetValue + 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) // there is no input larger than nTargetValue
            {
                if (tryDenom == 0)
                    // we didn't look at denom yet, let's do it
                    continue;
                else
                    // we looked at everything possible and didn't find anything, no luck
                    return false;
            }
            setCoinsRet.insert(coinLowestLarger.second);
            nValueRet += coinLowestLarger.first;
            return true;
        }

        // nTotalLower > nTargetValue
        break;

    }

    // Solve subset sum by stochastic approximation
    sort(vValue.rbegin(), vValue.rend(), CompareValueOnly());
    vector<char> vfBest;
    CAmount 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 {
        string s = "CWallet::SelectCoinsMinConf best subset: ";
        for (unsigned int i = 0; i < vValue.size(); i++)
        {
            if (vfBest[i])
            {
                setCoinsRet.insert(vValue[i].second);
                nValueRet += vValue[i].first;
                s += FormatMoney(vValue[i].first) + " ";
            }
        }
        LogPrintf("%s - total %s\n", s, FormatMoney(nBest));
    }

    return true;
}

bool CWallet::SelectCoins(const CAmount& nTargetValue, set<pair<const CWalletTx*,unsigned int> >& setCoinsRet, CAmount& nValueRet, const CCoinControl* coinControl, AvailableCoinsType coin_type, bool useIX) const
{
    // Note: this function should never be used for "always free" tx types like dstx

    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;

            if(coin_type == ONLY_DENOMINATED) {
                CTxIn vin = CTxIn(out.tx->GetHash(),out.i);
                int rounds = GetInputDarksendRounds(vin);
                // make sure it's actually anonymized
                if(rounds < nDarksendRounds) continue;
            }

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

    //if we're doing only denominated, we need to round up to the nearest .1DRK
    if(coin_type == ONLY_DENOMINATED) {
        // Make outputs by looping through denominations, from large to small
        BOOST_FOREACH(int64_t v, darkSendDenominations)
        {
            BOOST_FOREACH(const COutput& out, vCoins)
            {
                if(out.tx->vout[out.i].nValue == v                                            //make sure it's the denom we're looking for
                    && nValueRet + out.tx->vout[out.i].nValue < nTargetValue + (0.1*COIN)+100 //round the amount up to .1DRK over
                ){
                    CTxIn vin = CTxIn(out.tx->GetHash(),out.i);
                    int rounds = GetInputDarksendRounds(vin);
                    // make sure it's actually anonymized
                    if(rounds < nDarksendRounds) continue;
                    nValueRet += out.tx->vout[out.i].nValue;
                    setCoinsRet.insert(make_pair(out.tx, out.i));
                }
            }
        }
        return (nValueRet >= nTargetValue);
    }

    return (SelectCoinsMinConf(nTargetValue, 1, 6, vCoins, setCoinsRet, nValueRet) ||
            SelectCoinsMinConf(nTargetValue, 1, 1, vCoins, setCoinsRet, nValueRet) ||
            (bSpendZeroConfChange && SelectCoinsMinConf(nTargetValue, 0, 1, vCoins, setCoinsRet, nValueRet)));
}

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

bool CWallet::SelectCoinsByDenominations(int nDenom, int64_t nValueMin, int64_t nValueMax, std::vector<CTxIn>& vCoinsRet, std::vector<COutput>& vCoinsRet2, int64_t& nValueRet, int nDarksendRoundsMin, int nDarksendRoundsMax)
{
    vCoinsRet.clear();
    nValueRet = 0;

    vCoinsRet2.clear();
    vector<COutput> vCoins;
    AvailableCoins(vCoins, true, NULL, ONLY_DENOMINATED);

    std::random_shuffle(vCoins.rbegin(), vCoins.rend());

    //keep track of each denomination that we have
    bool fFound100 = false;
    bool fFound10 = false;
    bool fFound1 = false;
    bool fFoundDot1 = false;

    //Check to see if any of the denomination are off, in that case mark them as fulfilled
    if(!(nDenom & (1 << 0))) fFound100 = true;
    if(!(nDenom & (1 << 1))) fFound10 = true;
    if(!(nDenom & (1 << 2))) fFound1 = true;
    if(!(nDenom & (1 << 3))) fFoundDot1 = true;

    BOOST_FOREACH(const COutput& out, vCoins)
    {
        // masternode-like input should not be selected by AvailableCoins now anyway
        //if(out.tx->vout[out.i].nValue == 1000*COIN) continue;
        if(nValueRet + out.tx->vout[out.i].nValue <= nValueMax){
            bool fAccepted = false;

            // Function returns as follows:
            //
            // bit 0 - 100DRK+1 ( bit on if present )
            // bit 1 - 10DRK+1
            // bit 2 - 1DRK+1
            // bit 3 - .1DRK+1

            CTxIn vin = CTxIn(out.tx->GetHash(),out.i);

            int rounds = GetInputDarksendRounds(vin);
            if(rounds >= nDarksendRoundsMax) continue;
            if(rounds < nDarksendRoundsMin) continue;

            if(fFound100 && fFound10 && fFound1 && fFoundDot1){ //if fulfilled
                //we can return this for submission
                if(nValueRet >= nValueMin){
                    //random reduce the max amount we'll submit for anonymity
                    nValueMax -= (rand() % (nValueMax/5));
                    //on average use 50% of the inputs or less
                    int r = (rand() % (int)vCoins.size());
                    if((int)vCoinsRet.size() > r) return true;
                }
                //Denomination criterion has been met, we can take any matching denominations
                if((nDenom & (1 << 0)) && out.tx->vout[out.i].nValue == ((100*COIN)    +100000)) {fAccepted = true;}
                else if((nDenom & (1 << 1)) && out.tx->vout[out.i].nValue == ((10*COIN)+10000)) {fAccepted = true;}
                else if((nDenom & (1 << 2)) && out.tx->vout[out.i].nValue == ((1*COIN) +1000)) {fAccepted = true;}
                else if((nDenom & (1 << 3)) && out.tx->vout[out.i].nValue == ((.1*COIN)+100)) {fAccepted = true;}
            } else {
                //Criterion has not been satisfied, we will only take 1 of each until it is.
                if((nDenom & (1 << 0)) && out.tx->vout[out.i].nValue == ((100*COIN)    +100000)) {fAccepted = true; fFound100 = true;}
                else if((nDenom & (1 << 1)) && out.tx->vout[out.i].nValue == ((10*COIN)+10000)) {fAccepted = true; fFound10 = true;}
                else if((nDenom & (1 << 2)) && out.tx->vout[out.i].nValue == ((1*COIN) +1000)) {fAccepted = true; fFound1 = true;}
                else if((nDenom & (1 << 3)) && out.tx->vout[out.i].nValue == ((.1*COIN)+100)) {fAccepted = true; fFoundDot1 = true;}
            }
            if(!fAccepted) continue;

            vin.prevPubKey = out.tx->vout[out.i].scriptPubKey; // the inputs PubKey
            nValueRet += out.tx->vout[out.i].nValue;
            vCoinsRet.push_back(vin);
            vCoinsRet2.push_back(out);
        }
    }

    return (nValueRet >= nValueMin && fFound100 && fFound10 && fFound1 && fFoundDot1);
}

bool CWallet::SelectCoinsDark(CAmount nValueMin, CAmount nValueMax, std::vector<CTxIn>& setCoinsRet, CAmount& nValueRet, int nDarksendRoundsMin, int nDarksendRoundsMax) const
{
    CCoinControl *coinControl=NULL;

    setCoinsRet.clear();
    nValueRet = 0;

    vector<COutput> vCoins;
    AvailableCoins(vCoins, true, coinControl, nDarksendRoundsMin < 0 ? ONLY_NONDENOMINATED_NOTMN : ONLY_DENOMINATED);

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

    //order the array so largest nondenom are first, then denominations, then very small inputs.
    sort(vCoins.rbegin(), vCoins.rend(), CompareByPriority());

    BOOST_FOREACH(const COutput& out, vCoins)
    {
        //do not allow inputs less than 1 CENT
        if(out.tx->vout[out.i].nValue < CENT) continue;
        //do not allow collaterals to be selected
        if(IsCollateralAmount(out.tx->vout[out.i].nValue)) continue;
        if(fMasterNode && out.tx->vout[out.i].nValue == 1000*COIN) continue; //masternode input

        if(nValueRet + out.tx->vout[out.i].nValue <= nValueMax){
            CTxIn vin = CTxIn(out.tx->GetHash(),out.i);

            int rounds = GetInputDarksendRounds(vin);
            if(rounds >= nDarksendRoundsMax) continue;
            if(rounds < nDarksendRoundsMin) continue;

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

    // if it's more than min, we're good to return
    if(nValueRet >= nValueMin) return true;

    return false;
}

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

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

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

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

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

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

    return false;
}

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

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

                    if(out.tx->vout[out.i].nValue != nInputAmount) continue;
                    if(!IsDenominatedAmount(pcoin->vout[i].nValue)) continue;
                    if(IsSpent(out.tx->GetHash(), i) || !IsMine(pcoin->vout[i]) || !IsDenominated(vin)) continue;

                    nTotal++;
                }
            }
        }
    }

    return nTotal;
}

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

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

    return nFound > 0;
}

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

bool CWallet::SelectCoinsWithoutDenomination(int64_t nTargetValue, set<pair<const CWalletTx*,unsigned int> >& setCoinsRet, int64_t& nValueRet) const
{
    CCoinControl *coinControl=NULL;

    vector<COutput> vCoins;
    AvailableCoins(vCoins, true, coinControl, ONLY_NONDENOMINATED);

    BOOST_FOREACH(const COutput& out, vCoins)
    {
        nValueRet += out.tx->vout[out.i].nValue;
        setCoinsRet.insert(make_pair(out.tx, out.i));
    }
    return (nValueRet >= nTargetValue);
}

bool CWallet::CreateCollateralTransaction(CMutableTransaction& 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();

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

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

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

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

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

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

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

    return true;
}

bool CWallet::GetBudgetSystemCollateralTX(CTransaction& tx, uint256 hash, bool useIX)
{
    CWalletTx wtx;
    if(GetBudgetSystemCollateralTX(wtx, hash, useIX)){
        tx = (CTransaction)wtx;
        return true;
    }
    return false;
}

bool CWallet::GetBudgetSystemCollateralTX(CWalletTx& tx, uint256 hash, bool useIX)
{
    // make our change address
    CReserveKey reservekey(pwalletMain);

    CScript scriptChange;
    scriptChange << OP_RETURN << ToByteVector(hash);

    int64_t nFeeRet = 0;
    std::string strFail = "";
    vector< pair<CScript, int64_t> > vecSend;
    vecSend.push_back(make_pair(scriptChange, CENT));

    CCoinControl *coinControl=NULL;
    bool success = CreateTransaction(vecSend, tx, reservekey, nFeeRet, strFail, coinControl, ALL_COINS, useIX, (CAmount)BUDGET_FEE_TX);
    if(!success){
        LogPrintf("GetBudgetSystemCollateralTX: Error - %s\n", strFail.c_str());
        return false;
    }

    return true;
}


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

bool CWallet::CreateTransaction(const vector<pair<CScript, CAmount> >& vecSend,
                                CWalletTx& wtxNew, CReserveKey& reservekey, CAmount& nFeeRet, std::string& strFailReason, const CCoinControl* coinControl, AvailableCoinsType coin_type, bool useIX, CAmount nPayFee)
{
    if(useIX && nPayFee < CENT) nPayFee = CENT;

    CAmount nValue = 0;
    CAmount nFeeDelta = 0;
    BOOST_FOREACH (const PAIRTYPE(CScript, CAmount)& 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);
    CMutableTransaction txNew;

    {
        LOCK2(cs_main, cs_wallet);
        {
            nFeeRet = 0;
            if(nPayFee!=0) nFeeRet = nPayFee;
            while (true)
            {
                txNew.vin.clear();
                txNew.vout.clear();
                wtxNew.fFromMe = true;

                CAmount nTotalValue = nValue + nFeeRet + nFeeDelta;
                double dPriority = 0;
                // vouts to the payees
                BOOST_FOREACH (const PAIRTYPE(CScript, CAmount)& s, vecSend)
                {
                    CTxOut txout(s.second, s.first);
                    if (txout.IsDust(::minRelayTxFee))
                    {
                        strFailReason = _("Transaction amount too small");
                        return false;
                    }
                    txNew.vout.push_back(txout);
                }

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

                if (!SelectCoins(nTotalValue, setCoins, nValueIn, coinControl, coin_type, useIX))
                {
                    if(coin_type == ALL_COINS) {
                        strFailReason = _("Insufficient funds.");
                    } else if (coin_type == ONLY_NONDENOMINATED) {
                        strFailReason = _("Unable to locate enough Darksend non-denominated funds for this transaction.");
                    } else if (coin_type == ONLY_NONDENOMINATED_NOTMN) {
                        strFailReason = _("Unable to locate enough Darksend non-denominated funds for this transaction that are not equal 1000 DASH.");
                    } else {
                        strFailReason = _("Unable to locate enough Darksend denominated funds for this transaction.");
                        strFailReason += _("Darksend uses exact denominated amounts to send funds, you might simply need to anonymize some more coins.");
                    }

                    if(useIX){
                        strFailReason += _("InstantX requires inputs with at least 6 confirmations, you might need to wait a few minutes and try again.");
                    }

                    return false;
                }


                BOOST_FOREACH(PAIRTYPE(const CWalletTx*, unsigned int) pcoin, setCoins)
                {
                    CAmount nCredit = pcoin.first->vout[pcoin.second].nValue;
                    //The coin age after the next block (depth+1) is used instead of the current,
                    //reflecting an assumption the user would accept a bit more delay for
                    //a chance at a free transaction.
                    //But mempool inputs might still be in the mempool, so their age stays 0
                    int age = pcoin.first->GetDepthInMainChain();
                    if (age != 0)
                        age += 1;
                    dPriority += (double)nCredit * age;
                }

                CAmount nChange = nValueIn - nValue - nFeeRet;

                //over pay for denominated transactions
                if(coin_type == ONLY_DENOMINATED) {
                    nFeeRet += nChange;
                    nChange = 0;
                    wtxNew.mapValue["DS"] = "1";
                }

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

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

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

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

                        scriptChange = GetScriptForDestination(vchPubKey.GetID());
                    }

                    CTxOut newTxOut(nChange, scriptChange);

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

                // Fill vin
                BOOST_FOREACH(const PAIRTYPE(const CWalletTx*,unsigned int)& coin, setCoins)
                    txNew.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, txNew, nIn++))
                    {
                        strFailReason = _("Signing transaction failed");
                        return false;
                    }

                // Embed the constructed transaction data in wtxNew.
                *static_cast<CTransaction*>(&wtxNew) = CTransaction(txNew);

                // 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);

                // Can we complete this as a free transaction?
                if (fSendFreeTransactions && nBytes <= MAX_FREE_TRANSACTION_CREATE_SIZE)
                {
                    // Not enough fee: enough priority?
                    double dPriorityNeeded = mempool.estimatePriority(nTxConfirmTarget);
                    // Not enough mempool history to estimate: use hard-coded AllowFree.
                    if (dPriorityNeeded <= 0 && AllowFree(dPriority))
                        break;

                    // Small enough, and priority high enough, to send for free
                    if (dPriorityNeeded > 0 && dPriority >= dPriorityNeeded)
                        break;
                }

                CAmount nFeeNeeded = GetMinimumFee(nBytes, nTxConfirmTarget, mempool);

                // If we made it here and we aren't even able to meet the relay fee on the next pass, give up
                // because we must be at the maximum allowed fee.
                if (nFeeNeeded < ::minRelayTxFee.GetFee(nBytes))
                {
                    strFailReason = _("Transaction too large for fee policy");
                    return false;
                }

                if (nFeeRet == nFeeNeeded || (nFeeRet > nFeeNeeded && (nFeeDelta > 0 || useIX || coin_type == ONLY_DENOMINATED)))
                    break; // Done, enough fee included.

                if (nFeeRet > nFeeNeeded)
                    nFeeDelta = nFeeRet - nFeeNeeded + 1; // Try to lower fee

                // Include more fee and try again.
                nFeeRet = nFeeNeeded;
                continue;
            }
        }
    }
    return true;
}

bool CWallet::CreateTransaction(CScript scriptPubKey, const CAmount& nValue,
                                CWalletTx& wtxNew, CReserveKey& reservekey, CAmount& nFeeRet, std::string& strFailReason, const CCoinControl* coinControl, AvailableCoinsType coin_type, bool useIX, CAmount nPayFee)
{
    vector< pair<CScript, CAmount> > vecSend;
    vecSend.push_back(make_pair(scriptPubKey, nValue));
    return CreateTransaction(vecSend, wtxNew, reservekey, nFeeRet, strFailReason, coinControl, coin_type, useIX, nPayFee);
}

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

            // Notify that old coins are spent
            set<uint256> updated_hahes;
            BOOST_FOREACH(const CTxIn& txin, wtxNew.vin)
            {
                // notify only once
                if(updated_hahes.find(txin.prevout.hash) != updated_hahes.end()) continue;

                CWalletTx &coin = mapWallet[txin.prevout.hash];
                coin.BindWallet(this);
                NotifyTransactionChanged(this, txin.prevout.hash, CT_UPDATED);
                updated_hahes.insert(txin.prevout.hash);
            }
            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;
}

CAmount CWallet::GetMinimumFee(unsigned int nTxBytes, unsigned int nConfirmTarget, const CTxMemPool& pool)
{
    // payTxFee is user-set "I want to pay this much"
    CAmount nFeeNeeded = payTxFee.GetFee(nTxBytes);
    // user selected total at least (default=true)
    if (fPayAtLeastCustomFee && nFeeNeeded > 0 && nFeeNeeded < payTxFee.GetFeePerK())
        nFeeNeeded = payTxFee.GetFeePerK();
    // User didn't set: use -txconfirmtarget to estimate...
    if (nFeeNeeded == 0)
        nFeeNeeded = pool.estimateFee(nConfirmTarget).GetFee(nTxBytes);
    // ... unless we don't have enough mempool data, in which case fall
    // back to a hard-coded fee
    if (nFeeNeeded == 0)
        nFeeNeeded = minTxFee.GetFee(nTxBytes);
    // prevent user from paying a non-sense fee (like 1 satoshi): 0 < fee < minRelayFee
    if (nFeeNeeded < ::minRelayTxFee.GetFee(nTxBytes))
        nFeeNeeded = ::minRelayTxFee.GetFee(nTxBytes);
    // But always obey the maximum
    if (nFeeNeeded > maxTxFee)
        nFeeNeeded = maxTxFee;
    return nFeeNeeded;
}

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;
}

string CWallet::PrepareDarksendDenominate(int minRounds, int maxRounds)
{
    if (IsLocked())
        return _("Error: Wallet locked, unable to create transaction!");

    if(darkSendPool.GetState() != POOL_STATUS_ERROR && darkSendPool.GetState() != POOL_STATUS_SUCCESS)
        if(darkSendPool.GetMyTransactionCount() > 0)
            return _("Error: You already have pending entries in the Darksend pool");

    // ** find the coins we'll use
    std::vector<CTxIn> vCoins;
    std::vector<CTxIn> vCoinsResult;
    std::vector<COutput> vCoins2;
    int64_t nValueIn = 0;
    CReserveKey reservekey(this);

    /*
        Select the coins we'll use

        if minRounds >= 0 it means only denominated inputs are going in and coming out
    */
    if(minRounds >= 0){
        if (!SelectCoinsByDenominations(darkSendPool.sessionDenom, 0.1*COIN, DARKSEND_POOL_MAX, vCoins, vCoins2, nValueIn, minRounds, maxRounds))
            return _("Error: can't select current denominated inputs");
    }

    LogPrintf("PrepareDarksendDenominate - preparing darksend denominate . Got: %d \n", nValueIn);

    BOOST_FOREACH(CTxIn v, vCoins) 
        LockCoin(v.prevout);

    int64_t nValueLeft = nValueIn;
    std::vector<CTxOut> vOut;

    /*
        TODO: Front load with needed denominations (e.g. .1, 1 )
    */

    // Make outputs by looping through denominations: try to add every needed denomination, repeat up to 5-10 times.
    // This way we can be pretty sure that it should have at least one of each needed denomination.
    // NOTE: No need to randomize order of inputs because they were
    // initially shuffled in CWallet::SelectCoinsByDenominations already.
    int nStep = 0;
    int nStepsMax = 5 + GetRandInt(5);
    while(nStep < nStepsMax) {

        BOOST_FOREACH(int64_t v, darkSendDenominations){
            // only use the ones that are approved
            bool fAccepted = false;
            if((darkSendPool.sessionDenom & (1 << 0))      && v == ((100*COIN) +100000)) {fAccepted = true;}
            else if((darkSendPool.sessionDenom & (1 << 1)) && v == ((10*COIN)  +10000)) {fAccepted = true;}
            else if((darkSendPool.sessionDenom & (1 << 2)) && v == ((1*COIN)   +1000)) {fAccepted = true;}
            else if((darkSendPool.sessionDenom & (1 << 3)) && v == ((.1*COIN)  +100)) {fAccepted = true;}
            if(!fAccepted) continue;

            // try to add it
            if(nValueLeft - v >= 0) {
                // Note: this relies on a fact that both vectors MUST have same size
                std::vector<CTxIn>::iterator it = vCoins.begin();
                std::vector<COutput>::iterator it2 = vCoins2.begin();
                while(it2 != vCoins2.end()) {
                    // we have matching inputs
                    if((*it2).tx->vout[(*it2).i].nValue == v) {
                        // add new input in resulting vector
                        vCoinsResult.push_back(*it);
                        // remove corresponting items from initial vectors
                        vCoins.erase(it);
                        vCoins2.erase(it2);

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

                        // add new output
                        CTxOut o(v, scriptChange);
                        vOut.push_back(o);

                        // subtract denomination amount
                        nValueLeft -= v;

                        break;
                    }
                    ++it;
                    ++it2;
                }
            }
        }

        nStep++;

        if(nValueLeft == 0) break;
    }

    // unlock unused coins
    BOOST_FOREACH(CTxIn v, vCoins)
        UnlockCoin(v.prevout);

    if(darkSendPool.GetDenominations(vOut) != darkSendPool.sessionDenom) {
        // unlock used coins on failure
        BOOST_FOREACH(CTxIn v, vCoinsResult)
            UnlockCoin(v.prevout);
        return "Error: can't make current denominated outputs";
    }

    // randomize the output order
    std::random_shuffle (vOut.begin(), vOut.end());

    // We also do not care about full amount as long as we have right denominations, just pass what we found
    darkSendPool.SendDarksendDenominate(vCoinsResult, vOut, nValueIn - nValueLeft);

    return "";
}

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();

    uiInterface.LoadWallet(this);

    return DB_LOAD_OK;
}


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

    if (nZapWalletTxRet != DB_LOAD_OK)
        return nZapWalletTxRet;

    return DB_LOAD_OK;
}


bool CWallet::SetAddressBook(const CTxDestination& address, const string& strName, const string& strPurpose)
{
    bool fUpdated = false;
    {
        LOCK(cs_wallet); // mapAddressBook
        std::map<CTxDestination, CAddressBookData>::iterator mi = mapAddressBook.find(address);
        fUpdated = mi != mapAddressBook.end();
        mapAddressBook[address].name = strName;
        if (!strPurpose.empty()) /* update purpose only if requested */
            mapAddressBook[address].purpose = strPurpose;
    }
    NotifyAddressBookChanged(this, address, strName, ::IsMine(*this, address) != ISMINE_NO,
                             strPurpose, (fUpdated ? CT_UPDATED : CT_NEW) );
    if (!fFileBacked)
        return false;
    if (!strPurpose.empty() && !CWalletDB(strWalletFile).WritePurpose(CBitcoinAddress(address).ToString(), strPurpose))
        return false;
    return CWalletDB(strWalletFile).WriteName(CBitcoinAddress(address).ToString(), strName);
}

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

        if(fFileBacked)
        {
            // Delete destdata tuples associated with address
            std::string strAddress = CBitcoinAddress(address).ToString();
            BOOST_FOREACH(const PAIRTYPE(string, string) &item, mapAddressBook[address].destdata)
            {
                CWalletDB(strWalletFile).EraseDestData(strAddress, item.first);
            }
        }
        mapAddressBook.erase(address);
    }

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

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

bool CWallet::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;

        int64_t 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 kpSize)
{
    {
        LOCK(cs_wallet);

        if (IsLocked())
            return false;

        CWalletDB walletdb(strWalletFile);

        // Top up key pool
        unsigned int nTargetSize;
        if (kpSize > 0)
            nTargetSize = kpSize;
        else
            nTargetSize = max(GetArg("-keypool", 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);
    }
}

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

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

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

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

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

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

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

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

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

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

                CAmount n = IsSpent(walletEntry.first, i) ? 0 : pcoin->vout[i].nValue;

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

    return balances;
}

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

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

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

            // group change with input addresses
            if (any_mine)
            {
               BOOST_FOREACH(CTxOut txout, pcoin->vout)
                   if (IsChange(txout))
                   {
                       CTxDestination txoutAddr;
                       if(!ExtractDestination(txout.scriptPubKey, txoutAddr))
                           continue;
                       grouping.insert(txoutAddr);
                   }
            }
            if (grouping.size() > 0)
            {
                groupings.insert(grouping);
                grouping.clear();
            }
        }

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

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

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

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

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

    return ret;
}

set<CTxDestination> CWallet::GetAccountAddresses(string strAccount) const
{
    LOCK(cs_wallet);
    set<CTxDestination> result;
    BOOST_FOREACH(const PAIRTYPE(CTxDestination, CAddressBookData)& item, mapAddressBook)
    {
        const CTxDestination& address = item.first;
        const string& strName = item.second.name;
        if (strName == strAccount)
            result.insert(address);
    }
    return result;
}

bool CReserveKey::GetReservedKey(CPubKey& pubkey)
{
    if (nIndex == -1)
    {
        CKeyPool keypool;
        pwallet->ReserveKeyFromKeyPool(nIndex, keypool);
        if (nIndex != -1)
            vchPubKey = keypool.vchPubKey;
        else {
            return false;
        }
    }
    assert(vchPubKey.IsValid());
    pubkey = vchPubKey;
    return true;
}

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

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

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

    CWalletDB walletdb(strWalletFile);

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

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);
    }
}

/** @} */ // end of Actions

class CAffectedKeysVisitor : public boost::static_visitor<void> {
private:
    const CKeyStore &keystore;
    std::vector<CKeyID> &vKeys;

public:
    CAffectedKeysVisitor(const CKeyStore &keystoreIn, std::vector<CKeyID> &vKeysIn) : keystore(keystoreIn), vKeys(vKeysIn) {}

    void Process(const CScript &script) {
        txnouttype type;
        std::vector<CTxDestination> vDest;
        int nRequired;
        if (ExtractDestinations(script, type, vDest, nRequired)) {
            BOOST_FOREACH(const CTxDestination &dest, vDest)
                boost::apply_visitor(*this, dest);
        }
    }

    void operator()(const CKeyID &keyId) {
        if (keystore.HaveKey(keyId))
            vKeys.push_back(keyId);
    }

    void operator()(const CScriptID &scriptId) {
        CScript script;
        if (keystore.GetCScript(scriptId, script))
            Process(script);
    }

    void operator()(const CNoDestination &none) {}
};

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

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

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

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

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

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

bool CWallet::AddDestData(const CTxDestination &dest, const std::string &key, const std::string &value)
{
    if (boost::get<CNoDestination>(&dest))
        return false;

    mapAddressBook[dest].destdata.insert(std::make_pair(key, value));
    if (!fFileBacked)
        return true;
    return CWalletDB(strWalletFile).WriteDestData(CBitcoinAddress(dest).ToString(), key, value);
}

bool CWallet::EraseDestData(const CTxDestination &dest, const std::string &key)
{
    if (!mapAddressBook[dest].destdata.erase(key))
        return false;
    if (!fFileBacked)
        return true;
    return CWalletDB(strWalletFile).EraseDestData(CBitcoinAddress(dest).ToString(), key);
}

bool CWallet::LoadDestData(const CTxDestination &dest, const std::string &key, const std::string &value)
{
    mapAddressBook[dest].destdata.insert(std::make_pair(key, value));
    return true;
}

bool CWallet::GetDestData(const CTxDestination &dest, const std::string &key, std::string *value) const
{
    std::map<CTxDestination, CAddressBookData>::const_iterator i = mapAddressBook.find(dest);
    if(i != mapAddressBook.end())
    {
        CAddressBookData::StringMap::const_iterator j = i->second.destdata.find(key);
        if(j != i->second.destdata.end())
        {
            if(value)
                *value = j->second;
            return true;
        }
    }
    return false;
}

CKeyPool::CKeyPool()
{
    nTime = GetTime();
}

CKeyPool::CKeyPool(const CPubKey& vchPubKeyIn)
{
    nTime = GetTime();
    vchPubKey = vchPubKeyIn;
}

CWalletKey::CWalletKey(int64_t nExpires)
{
    nTimeCreated = (nExpires ? GetTime() : 0);
    nTimeExpires = nExpires;
}

int CMerkleTx::SetMerkleBranch(const CBlock& block)
{
    AssertLockHeld(cs_main);
    CBlock blockTmp;

    // Update the tx's hashBlock
    hashBlock = block.GetHash();

    // Locate the transaction
    for (nIndex = 0; nIndex < (int)block.vtx.size(); nIndex++)
        if (block.vtx[nIndex] == *(CTransaction*)this)
            break;
    if (nIndex == (int)block.vtx.size())
    {
        vMerkleBranch.clear();
        nIndex = -1;
        LogPrintf("ERROR: SetMerkleBranch() : couldn't find tx in block\n");
        return 0;
    }

    // Fill in merkle branch
    vMerkleBranch = block.GetMerkleBranch(nIndex);

    // Is the tx in a block that's in the main chain
    BlockMap::iterator mi = mapBlockIndex.find(hashBlock);
    if (mi == mapBlockIndex.end())
        return 0;
    const CBlockIndex* pindex = (*mi).second;
    if (!pindex || !chainActive.Contains(pindex))
        return 0;

    return chainActive.Height() - pindex->nHeight + 1;
}

int CMerkleTx::GetDepthInMainChainINTERNAL(const CBlockIndex* &pindexRet) const
{
    if (hashBlock == 0 || nIndex == -1)
        return 0;
    AssertLockHeld(cs_main);

    // Find the block it claims to be in
    BlockMap::iterator mi = mapBlockIndex.find(hashBlock);
    if (mi == mapBlockIndex.end())
        return 0;
    CBlockIndex* pindex = (*mi).second;
    if (!pindex || !chainActive.Contains(pindex))
        return 0;

    // Make sure the merkle branch connects to this block
    if (!fMerkleVerified)
    {
        if (CBlock::CheckMerkleBranch(GetHash(), vMerkleBranch, nIndex) != pindex->hashMerkleRoot)
            return 0;
        fMerkleVerified = true;
    }

    pindexRet = pindex;
    return chainActive.Height() - pindex->nHeight + 1;
}

int CMerkleTx::GetDepthInMainChain(const CBlockIndex* &pindexRet, bool enableIX) const
{
    AssertLockHeld(cs_main);
    int nResult = GetDepthInMainChainINTERNAL(pindexRet);
    if (nResult == 0 && !mempool.exists(GetHash()))
        return -1; // Not in chain, not in mempool

    if(enableIX){
        if (nResult < 6){
            int signatures = GetTransactionLockSignatures();
            if(signatures >= INSTANTX_SIGNATURES_REQUIRED){
                return nInstantXDepth+nResult;
            }
        }
    }

    return nResult;
}

int CMerkleTx::GetBlocksToMaturity() const
{
    if (!IsCoinBase())
        return 0;
    return max(0, (COINBASE_MATURITY+1) - GetDepthInMainChain());
}


bool CMerkleTx::AcceptToMemoryPool(bool fLimitFree, bool fRejectInsaneFee, bool ignoreFees)
{
    CValidationState state;
    return ::AcceptToMemoryPool(mempool, state, *this, fLimitFree, NULL, fRejectInsaneFee, ignoreFees);
}

int CMerkleTx::GetTransactionLockSignatures() const
{
    if(fLargeWorkForkFound || fLargeWorkInvalidChainFound) return -2;
    if(!IsSporkActive(SPORK_2_INSTANTX)) return -3;
    if(nInstantXDepth == 0) return -1;

    //compile consessus vote
    std::map<uint256, CTransactionLock>::iterator i = mapTxLocks.find(GetHash());
    if (i != mapTxLocks.end()){
        return (*i).second.CountSignatures();
    }

    return -1;
}

bool CMerkleTx::IsTransactionLockTimedOut() const
{
    if(nInstantXDepth == 0) return 0;

    //compile consessus vote
    std::map<uint256, CTransactionLock>::iterator i = mapTxLocks.find(GetHash());
    if (i != mapTxLocks.end()){
        return GetTime() > (*i).second.nTimeout;
    }

    return false;
}