Implement raw transaction RPC calls

Implement listunspent / getrawtransaction / createrawtransaction /
signrawtransaction, to support creation and
signing-on-multiple-device multisignature transactions.

12 files changed, 750 insertions, 56 deletions

diff --git a/bitcoin-qt.pro b/bitcoin-qt.pro
index 6bfeeff072..22f624d59c 100644
--- a/bitcoin-qt.pro
+++ b/bitcoin-qt.pro
@@ -207,6 +207,7 @@ SOURCES += src/qt/bitcoin.cpp src/qt/bitcoingui.cpp \
     src/bitcoinrpc.cpp \
     src/rpcdump.cpp \
     src/rpcnet.cpp \
+    src/rpcrawtransaction.cpp \
     src/qt/overviewpage.cpp \
     src/qt/csvmodelwriter.cpp \
     src/crypter.cpp \
diff --git a/src/bitcoinrpc.cpp b/src/bitcoinrpc.cpp
index c9413a5b29..adcf359c9f 100644
--- a/src/bitcoinrpc.cpp
+++ b/src/bitcoinrpc.cpp
@@ -46,10 +46,16 @@ static std::string strRPCUserColonPass;
 static int64 nWalletUnlockTime;
 static CCriticalSection cs_nWalletUnlockTime;
 
-extern Value getconnectioncount(const Array& params, bool fHelp);
+extern Value getconnectioncount(const Array& params, bool fHelp); // in rpcnet.cpp
 extern Value getpeerinfo(const Array& params, bool fHelp);
-extern Value dumpprivkey(const Array& params, bool fHelp);
+extern Value dumpprivkey(const Array& params, bool fHelp); // in rpcdump.cpp
 extern Value importprivkey(const Array& params, bool fHelp);
+extern Value getrawtransaction(const Array& params, bool fHelp); // in rcprawtransaction.cpp
+extern Value listunspent(const Array& params, bool fHelp);
+extern Value createrawtransaction(const Array& params, bool fHelp);
+extern Value decoderawtransaction(const Array& params, bool fHelp);
+extern Value signrawtransaction(const Array& params, bool fHelp);
+extern Value sendrawtransaction(const Array& params, bool fHelp);
 
 const Object emptyobj;
 
@@ -159,7 +165,7 @@ HexBits(unsigned int nBits)
     return HexStr(BEGIN(uBits.cBits), END(uBits.cBits));
 }
 
-static std::string
+std::string
 HelpRequiringPassphrase()
 {
     return pwalletMain->IsCrypted()
@@ -167,7 +173,7 @@ HelpRequiringPassphrase()
         : "";
 }
 
-static inline void
+void
 EnsureWalletIsUnlocked()
 {
     if (pwalletMain->IsLocked())
@@ -2048,44 +2054,6 @@ Value getblock(const Array& params, bool fHelp)
     return blockToJSON(block, pblockindex);
 }
 
-Value sendrawtx(const Array& params, bool fHelp)
-{
-    if (fHelp || params.size() < 1 || params.size() > 1)
-        throw runtime_error(
-            "sendrawtx <hex string>\n"
-            "Submits raw transaction (serialized, hex-encoded) to local node and network.");
-
-    // parse hex string from parameter
-    vector<unsigned char> txData(ParseHex(params[0].get_str()));
-    CDataStream ssData(txData, SER_NETWORK, PROTOCOL_VERSION);
-    CTransaction tx;
-
-    // deserialize binary data stream
-    try {
-        ssData >> tx;
-    }
-    catch (std::exception &e) {
-        throw JSONRPCError(-22, "TX decode failed");
-    }
-
-    // push to local node
-    CTxDB txdb("r");
-    if (!tx.AcceptToMemoryPool(txdb))
-        throw JSONRPCError(-22, "TX rejected");
-
-    SyncWithWallets(tx, NULL, true);
-
-    // relay to network
-    CInv inv(MSG_TX, tx.GetHash());
-    RelayInventory(inv);
-
-    return tx.GetHash().GetHex();
-}
-
-
-
-
-
 
 
 
@@ -2147,7 +2115,12 @@ static const CRPCCommand vRPCCommands[] =
     { "listsinceblock",         &listsinceblock,         false },
     { "dumpprivkey",            &dumpprivkey,            false },
     { "importprivkey",          &importprivkey,          false },
-    { "sendrawtx",              &sendrawtx,              false },
+    { "listunspent",            &listunspent,            false },
+    { "getrawtransaction",      &getrawtransaction,      false },
+    { "createrawtransaction",   &createrawtransaction,   false },
+    { "decoderawtransaction",   &decoderawtransaction,   false },
+    { "signrawtransaction",     &signrawtransaction,     false },
+    { "sendrawtransaction",     &sendrawtransaction,     false },
 };
 
 CRPCTable::CRPCTable()
@@ -3021,6 +2994,13 @@ Array RPCConvertValues(const std::string &strMethod, const std::vector<std::stri
     if (strMethod == "sendmany"               && n > 2) ConvertTo<boost::int64_t>(params[2]);
     if (strMethod == "addmultisigaddress"     && n > 0) ConvertTo<boost::int64_t>(params[0]);
     if (strMethod == "addmultisigaddress"     && n > 1) ConvertTo<Array>(params[1]);
+    if (strMethod == "listunspent"            && n > 0) ConvertTo<boost::int64_t>(params[0]);
+    if (strMethod == "listunspent"            && n > 1) ConvertTo<boost::int64_t>(params[1]);
+    if (strMethod == "getrawtransaction"      && n > 1) ConvertTo<boost::int64_t>(params[1]);
+    if (strMethod == "createrawtransaction"   && n > 0) ConvertTo<Array>(params[0]);
+    if (strMethod == "createrawtransaction"   && n > 1) ConvertTo<Object>(params[1]);
+    if (strMethod == "signrawtransaction"     && n > 1) ConvertTo<Array>(params[1]);
+    if (strMethod == "signrawtransaction"     && n > 2) ConvertTo<Array>(params[2]);
 
     return params;
 }
diff --git a/src/makefile.linux-mingw b/src/makefile.linux-mingw
index 5afb5c78a1..e7cbb47046 100644
--- a/src/makefile.linux-mingw
+++ b/src/makefile.linux-mingw
@@ -61,6 +61,7 @@ OBJS= \
     obj/bitcoinrpc.o \
     obj/rpcdump.o \
     obj/rpcnet.o \
+    obj/rpcrawtransaction.o \
     obj/script.o \
     obj/sync.o \
     obj/util.o \
diff --git a/src/makefile.mingw b/src/makefile.mingw
index 907a15a3f1..e60b3201ff 100644
--- a/src/makefile.mingw
+++ b/src/makefile.mingw
@@ -58,6 +58,7 @@ OBJS= \
     obj/bitcoinrpc.o \
     obj/rpcdump.o \
     obj/rpcnet.o \
+    obj/rpcrawtransaction.o \
     obj/script.o \
     obj/sync.o \
     obj/util.o \
diff --git a/src/makefile.osx b/src/makefile.osx
index 44e648d677..f9f28267be 100644
--- a/src/makefile.osx
+++ b/src/makefile.osx
@@ -85,6 +85,7 @@ OBJS= \
     obj/bitcoinrpc.o \
     obj/rpcdump.o \
     obj/rpcnet.o \
+    obj/rpcrawtransaction.o \
     obj/script.o \
     obj/sync.o \
     obj/util.o \
diff --git a/src/makefile.unix b/src/makefile.unix
index 6d9bf276df..2784335a20 100644
--- a/src/makefile.unix
+++ b/src/makefile.unix
@@ -105,6 +105,7 @@ OBJS= \
     obj/bitcoinrpc.o \
     obj/rpcdump.o \
     obj/rpcnet.o \
+    obj/rpcrawtransaction.o \
     obj/script.o \
     obj/sync.o \
     obj/util.o \
diff --git a/src/rpcrawtransaction.cpp b/src/rpcrawtransaction.cpp
new file mode 100644
index 0000000000..0e8c806834
--- /dev/null
+++ b/src/rpcrawtransaction.cpp
@@ -0,0 +1,470 @@
+// Copyright (c) 2010 Satoshi Nakamoto
+// Copyright (c) 2009-2012 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <boost/assign/list_of.hpp>
+
+#include "base58.h"
+#include "bitcoinrpc.h"
+#include "db.h"
+#include "init.h"
+#include "main.h"
+#include "wallet.h"
+
+using namespace std;
+using namespace boost;
+using namespace boost::assign;
+using namespace json_spirit;
+
+// These are all in bitcoinrpc.cpp:
+extern Object JSONRPCError(int code, const string& message);
+extern int64 AmountFromValue(const Value& value);
+extern Value ValueFromAmount(int64 amount);
+extern std::string HelpRequiringPassphrase();
+extern void EnsureWalletIsUnlocked();
+
+void
+ScriptPubKeyToJSON(const CScript& scriptPubKey, Object& out)
+{
+    txnouttype type;
+    vector<CTxDestination> addresses;
+    int nRequired;
+
+    out.push_back(Pair("asm", scriptPubKey.ToString()));
+    out.push_back(Pair("hex", HexStr(scriptPubKey.begin(), scriptPubKey.end())));
+
+    if (!ExtractDestinations(scriptPubKey, type, addresses, nRequired))
+    {
+        out.push_back(Pair("type", GetTxnOutputType(TX_NONSTANDARD)));
+        return;
+    }
+
+    out.push_back(Pair("reqSigs", nRequired));
+    out.push_back(Pair("type", GetTxnOutputType(type)));
+
+    Array a;
+    BOOST_FOREACH(const CTxDestination& addr, addresses)
+        a.push_back(CBitcoinAddress(addr).ToString());
+    out.push_back(Pair("addresses", a));
+}
+
+void
+TxToJSON(const CTransaction& tx, const uint256 hashBlock, Object& entry)
+{
+    entry.push_back(Pair("txid", tx.GetHash().GetHex()));
+    entry.push_back(Pair("version", tx.nVersion));
+    entry.push_back(Pair("locktime", (boost::int64_t)tx.nLockTime));
+    Array vin;
+    BOOST_FOREACH(const CTxIn& txin, tx.vin)
+    {
+        Object in;
+        if (tx.IsCoinBase())
+            in.push_back(Pair("coinbase", HexStr(txin.scriptSig.begin(), txin.scriptSig.end())));
+        else
+        {
+            in.push_back(Pair("txid", txin.prevout.hash.GetHex()));
+            in.push_back(Pair("vout", (boost::int64_t)txin.prevout.n));
+            Object o;
+            o.push_back(Pair("asm", txin.scriptSig.ToString()));
+            o.push_back(Pair("hex", HexStr(txin.scriptSig.begin(), txin.scriptSig.end())));
+            in.push_back(Pair("scriptSig", o));
+        }
+        in.push_back(Pair("sequence", (boost::int64_t)txin.nSequence));
+        vin.push_back(in);
+    }
+    entry.push_back(Pair("vin", vin));
+    Array vout;
+    for (int i = 0; i < tx.vout.size(); i++)
+    {
+        const CTxOut& txout = tx.vout[i];
+        Object out;
+        out.push_back(Pair("value", ValueFromAmount(txout.nValue)));
+        out.push_back(Pair("n", i));
+        Object o;
+        ScriptPubKeyToJSON(txout.scriptPubKey, o);
+        out.push_back(Pair("scriptPubKey", o));
+        vout.push_back(out);
+    }
+    entry.push_back(Pair("vout", vout));
+
+    if (hashBlock != 0)
+    {
+        entry.push_back(Pair("blockhash", hashBlock.GetHex()));
+        map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
+        if (mi != mapBlockIndex.end() && (*mi).second)
+        {
+            CBlockIndex* pindex = (*mi).second;
+            if (pindex->IsInMainChain())
+            {
+                entry.push_back(Pair("confirmations", 1 + nBestHeight - pindex->nHeight));
+                entry.push_back(Pair("time", (boost::int64_t)pindex->nTime));
+            }
+            else
+                entry.push_back(Pair("confirmations", 0));
+        }
+    }
+}
+
+Value getrawtransaction(const Array& params, bool fHelp)
+{
+    if (fHelp || params.size() < 1 || params.size() > 2)
+        throw runtime_error(
+            "getrawtransaction <txid> [verbose=0]\n"
+            "If verbose=0, returns a string that is\n"
+            "serialized, hex-encoded data for <txid>.\n"
+            "If verbose is non-zero, returns an Object\n"
+            "with information about <txid>.");
+
+    uint256 hash;
+    hash.SetHex(params[0].get_str());
+
+    bool fVerbose = false;
+    if (params.size() > 1)
+        fVerbose = (params[1].get_int() != 0);
+
+    CTransaction tx;
+    uint256 hashBlock = 0;
+    if (!GetTransaction(hash, tx, hashBlock))
+        throw JSONRPCError(-5, "No information available about transaction");
+
+    CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
+    ssTx << tx;
+    string strHex = HexStr(ssTx.begin(), ssTx.end());
+
+    if (!fVerbose)
+        return strHex;
+
+    Object result;
+    result.push_back(Pair("hex", strHex));
+    TxToJSON(tx, hashBlock, result);
+    return result;
+}
+
+Value listunspent(const Array& params, bool fHelp)
+{
+    if (fHelp || params.size() > 2)
+        throw runtime_error(
+            "listunspent [minconf=1] [maxconf=999999]\n"
+            "Returns array of unspent transaction outputs\n"
+            "with between minconf and maxconf (inclusive) confirmations.\n"
+            "Results are an array of Objects, each of which has:\n"
+            "{txid, vout, scriptPubKey, amount, confirmations}");
+
+    RPCTypeCheck(params, list_of(int_type)(int_type));
+
+    int nMinDepth = 1;
+    if (params.size() > 0)
+        nMinDepth = params[0].get_int();
+
+    int nMaxDepth = 999999;
+    if (params.size() > 1)
+        nMaxDepth = params[1].get_int();
+
+    Array results;
+    vector<COutput> vecOutputs;
+    pwalletMain->AvailableCoins(vecOutputs, false);
+    BOOST_FOREACH(const COutput& out, vecOutputs)
+    {
+        if (out.nDepth < nMinDepth || out.nDepth > nMaxDepth)
+            continue;
+
+        int64 nValue = out.tx->vout[out.i].nValue;
+        const CScript& pk = out.tx->vout[out.i].scriptPubKey;
+        Object entry;
+        entry.push_back(Pair("txid", out.tx->GetHash().GetHex()));
+        entry.push_back(Pair("vout", out.i));
+        entry.push_back(Pair("scriptPubKey", HexStr(pk.begin(), pk.end())));
+        entry.push_back(Pair("amount",ValueFromAmount(nValue)));
+        entry.push_back(Pair("confirmations",out.nDepth));
+        results.push_back(entry);
+    }
+
+    return results;
+}
+
+Value createrawtransaction(const Array& params, bool fHelp)
+{
+    if (fHelp || params.size() != 2)
+        throw runtime_error(
+            "createrawtransaction [{\"txid\":txid,\"vout\":n},...] {address:amount,...}\n"
+            "Create a transaction spending given inputs\n"
+            "(array of objects containing transaction id and output number),\n"
+            "sending to given address(es).\n"
+            "Returns hex-encoded raw transaction.\n"
+            "Note that the transaction's inputs are not signed, and\n"
+            "it is not stored in the wallet or transmitted to the network.");
+
+    RPCTypeCheck(params, list_of(array_type)(obj_type));
+
+    Array inputs = params[0].get_array();
+    Object sendTo = params[1].get_obj();
+
+    CTransaction rawTx;
+
+    BOOST_FOREACH(Value& input, inputs)
+    {
+        const Object& o = input.get_obj();
+
+        const Value& txid_v = find_value(o, "txid");
+        if (txid_v.type() != str_type)
+            throw JSONRPCError(-8, "Invalid parameter, missing txid key");
+        string txid = txid_v.get_str();
+        if (!IsHex(txid))
+            throw JSONRPCError(-8, "Invalid parameter, expected hex txid");
+
+        const Value& vout_v = find_value(o, "vout");
+        if (vout_v.type() != int_type)
+            throw JSONRPCError(-8, "Invalid parameter, missing vout key");
+        int nOutput = vout_v.get_int();
+        if (nOutput < 0)
+            throw JSONRPCError(-8, "Invalid parameter, vout must be positive");
+
+        CTxIn in(COutPoint(uint256(txid), nOutput));
+        rawTx.vin.push_back(in);
+    }
+
+    set<CBitcoinAddress> setAddress;
+    BOOST_FOREACH(const Pair& s, sendTo)
+    {
+        CBitcoinAddress address(s.name_);
+        if (!address.IsValid())
+            throw JSONRPCError(-5, string("Invalid Bitcoin address:")+s.name_);
+
+        if (setAddress.count(address))
+            throw JSONRPCError(-8, string("Invalid parameter, duplicated address: ")+s.name_);
+        setAddress.insert(address);
+
+        CScript scriptPubKey;
+        scriptPubKey.SetDestination(address.Get());
+        int64 nAmount = AmountFromValue(s.value_);
+
+        CTxOut out(nAmount, scriptPubKey);
+        rawTx.vout.push_back(out);
+    }
+
+    CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
+    ss << rawTx;
+    return HexStr(ss.begin(), ss.end());
+}
+
+Value decoderawtransaction(const Array& params, bool fHelp)
+{
+    if (fHelp || params.size() != 1)
+        throw runtime_error(
+            "decoderawtransaction <hex string>\n"
+            "Return a JSON object representing the serialized, hex-encoded transaction.");
+
+    RPCTypeCheck(params, list_of(str_type));
+
+    vector<unsigned char> txData(ParseHex(params[0].get_str()));
+    CDataStream ssData(txData, SER_NETWORK, PROTOCOL_VERSION);
+    CTransaction tx;
+    try {
+        ssData >> tx;
+    }
+    catch (std::exception &e) {
+        throw JSONRPCError(-22, "TX decode failed");
+    }
+
+    Object result;
+    TxToJSON(tx, 0, result);
+
+    return result;
+}
+
+Value signrawtransaction(const Array& params, bool fHelp)
+{
+    if (fHelp || params.size() < 1 || params.size() > 3)
+        throw runtime_error(
+            "signrawtransaction <hex string> [{\"txid\":txid,\"vout\":n,\"scriptPubKey\":hex},...] [<privatekey1>,...]\n"
+            "Sign inputs for raw transaction (serialized, hex-encoded).\n"
+            "Second optional argument is an array of previous transaction outputs that\n"
+            "this transaction depends on but may not yet be in the blockchain.\n"
+            "Third optional argument is an array of base58-encoded private\n"
+            "keys that, if given, will be the only keys used to sign the transaction.\n"
+            "Returns json object with keys:\n"
+            "  hex : raw transaction with signature(s) (hex-encoded string)\n"
+            "  complete : 1 if transaction has a complete set of signature (0 if not)"
+            + HelpRequiringPassphrase());
+
+    if (params.size() < 3)
+        EnsureWalletIsUnlocked();
+
+    RPCTypeCheck(params, list_of(str_type)(array_type)(array_type));
+
+    vector<unsigned char> txData(ParseHex(params[0].get_str()));
+    CDataStream ssData(txData, SER_NETWORK, PROTOCOL_VERSION);
+    vector<CTransaction> txVariants;
+    while (!ssData.empty())
+    {
+        try {
+            CTransaction tx;
+            ssData >> tx;
+            txVariants.push_back(tx);
+        }
+        catch (std::exception &e) {
+            throw JSONRPCError(-22, "TX decode failed");
+        }
+    }
+
+    if (txVariants.empty())
+        throw JSONRPCError(-22, "Missing transaction");
+
+    // mergedTx will end up with all the signatures; it
+    // starts as a clone of the rawtx:
+    CTransaction mergedTx(txVariants[0]);
+    bool fComplete = true;
+
+    // Fetch previous transactions (inputs):
+    map<COutPoint, CScript> mapPrevOut;
+    {
+        MapPrevTx mapPrevTx;
+        CTxDB txdb("r");
+        map<uint256, CTxIndex> unused;
+        bool fInvalid;
+        mergedTx.FetchInputs(txdb, unused, false, false, mapPrevTx, fInvalid);
+
+        // Copy results into mapPrevOut:
+        BOOST_FOREACH(const CTxIn& txin, mergedTx.vin)
+        {
+            const uint256& prevHash = txin.prevout.hash;
+            if (mapPrevTx.count(prevHash))
+                mapPrevOut[txin.prevout] = mapPrevTx[prevHash].second.vout[txin.prevout.n].scriptPubKey;
+        }
+    }
+
+    // Add previous txouts given in the RPC call:
+    if (params.size() > 1)
+    {
+        Array prevTxs = params[1].get_array();
+        BOOST_FOREACH(Value& p, prevTxs)
+        {
+            if (p.type() != obj_type)
+                throw JSONRPCError(-22, "expected object with {\"txid'\",\"vout\",\"scriptPubKey\"}");
+
+            Object prevOut = p.get_obj();
+
+            RPCTypeCheck(prevOut, map_list_of("txid", str_type)("vout", int_type)("scriptPubKey", str_type));
+
+            string txidHex = find_value(prevOut, "txid").get_str();
+            if (!IsHex(txidHex))
+                throw JSONRPCError(-22, "txid must be hexadecimal");
+            uint256 txid;
+            txid.SetHex(txidHex);
+
+            int nOut = find_value(prevOut, "vout").get_int();
+            if (nOut < 0)
+                throw JSONRPCError(-22, "vout must be positive");
+
+            string pkHex = find_value(prevOut, "scriptPubKey").get_str();
+            if (!IsHex(pkHex))
+                throw JSONRPCError(-22, "scriptPubKey must be hexadecimal");
+            vector<unsigned char> pkData(ParseHex(pkHex));
+            CScript scriptPubKey(pkData.begin(), pkData.end());
+
+            COutPoint outpoint(txid, nOut);
+            if (mapPrevOut.count(outpoint))
+            {
+                // Complain if scriptPubKey doesn't match
+                if (mapPrevOut[outpoint] != scriptPubKey)
+                {
+                    string err("Previous output scriptPubKey mismatch:\n");
+                    err = err + mapPrevOut[outpoint].ToString() + "\nvs:\n"+
+                        scriptPubKey.ToString();
+                    throw JSONRPCError(-22, err);
+                }
+            }
+            else
+                mapPrevOut[outpoint] = scriptPubKey;
+        }
+    }
+
+    bool fGivenKeys = false;
+    CBasicKeyStore tempKeystore;
+    if (params.size() > 2)
+    {
+        fGivenKeys = true;
+        Array keys = params[2].get_array();
+        BOOST_FOREACH(Value k, keys)
+        {
+            CBitcoinSecret vchSecret;
+            bool fGood = vchSecret.SetString(k.get_str());
+            if (!fGood)
+                throw JSONRPCError(-5,"Invalid private key");
+            CKey key;
+            bool fCompressed;
+            CSecret secret = vchSecret.GetSecret(fCompressed);
+            key.SetSecret(secret, fCompressed);
+            tempKeystore.AddKey(key);
+        }
+    }
+    const CKeyStore& keystore = (fGivenKeys ? tempKeystore : *pwalletMain);
+
+    // Sign what we can:
+    for (int i = 0; i < mergedTx.vin.size(); i++)
+    {
+        CTxIn& txin = mergedTx.vin[i];
+        if (mapPrevOut.count(txin.prevout) == 0)
+        {
+            fComplete = false;
+            continue;
+        }
+        const CScript& prevPubKey = mapPrevOut[txin.prevout];
+
+        txin.scriptSig.clear();
+        SignSignature(keystore, prevPubKey, mergedTx, i);
+
+        // ... and merge in other signatures:
+        BOOST_FOREACH(const CTransaction& txv, txVariants)
+        {
+            txin.scriptSig = CombineSignatures(prevPubKey, mergedTx, i, txin.scriptSig, txv.vin[i].scriptSig);
+        }
+        if (!VerifyScript(txin.scriptSig, prevPubKey, mergedTx, i, true, 0))
+            fComplete = false;
+    }
+
+    Object result;
+    CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
+    ssTx << mergedTx;
+    result.push_back(Pair("hex", HexStr(ssTx.begin(), ssTx.end())));
+    result.push_back(Pair("complete", fComplete));
+
+    return result;
+}
+
+Value sendrawtransaction(const Array& params, bool fHelp)
+{
+    if (fHelp || params.size() < 1 || params.size() > 1)
+        throw runtime_error(
+            "sendrawtransaction <hex string>\n"
+            "Submits raw transaction (serialized, hex-encoded) to local node and network.");
+
+    RPCTypeCheck(params, list_of(str_type));
+
+    // parse hex string from parameter
+    vector<unsigned char> txData(ParseHex(params[0].get_str()));
+    CDataStream ssData(txData, SER_NETWORK, PROTOCOL_VERSION);
+    CTransaction tx;
+
+    // deserialize binary data stream
+    try {
+        ssData >> tx;
+    }
+    catch (std::exception &e) {
+        throw JSONRPCError(-22, "TX decode failed");
+    }
+
+    // push to local node
+    CTxDB txdb("r");
+    if (!tx.AcceptToMemoryPool(txdb))
+        throw JSONRPCError(-22, "TX rejected");
+
+    SyncWithWallets(tx, NULL, true);
+
+    // relay to network
+    CInv inv(MSG_TX, tx.GetHash());
+    RelayInventory(inv);
+
+    return tx.GetHash().GetHex();
+}
diff --git a/src/script.cpp b/src/script.cpp
index 1451747fa2..103fc0e422 100644
--- a/src/script.cpp
+++ b/src/script.cpp
@@ -1331,15 +1331,12 @@ bool SignN(const vector<valtype>& multisigdata, const CKeyStore& keystore, uint2
 {
     int nSigned = 0;
     int nRequired = multisigdata.front()[0];
-    for (vector<valtype>::const_iterator it = multisigdata.begin()+1; it != multisigdata.begin()+multisigdata.size()-1; it++)
+    for (int i = 1; i < multisigdata.size()-1 && nSigned < nRequired; i++)
     {
-        const valtype& pubkey = *it;
+        const valtype& pubkey = multisigdata[i];
         CKeyID keyID = CPubKey(pubkey).GetID();
         if (Sign1(keyID, keystore, hash, nHashType, scriptSigRet))
-        {
             ++nSigned;
-            if (nSigned == nRequired) break;
-        }
     }
     return nSigned==nRequired;
 }
@@ -1612,12 +1609,13 @@ bool SignSignature(const CKeyStore &keystore, const CScript& fromPubKey, CTransa
 
         // Recompute txn hash using subscript in place of scriptPubKey:
         uint256 hash2 = SignatureHash(subscript, txTo, nIn, nHashType);
+
         txnouttype subType;
-        if (!Solver(keystore, subscript, hash2, nHashType, txin.scriptSig, subType))
-            return false;
-        if (subType == TX_SCRIPTHASH)
-            return false;
-        txin.scriptSig << static_cast<valtype>(subscript); // Append serialized subscript
+        bool fSolved =
+            Solver(keystore, subscript, hash2, nHashType, txin.scriptSig, subType) && subType != TX_SCRIPTHASH;
+        // Append serialized subscript whether or not it is completely signed:
+        txin.scriptSig << static_cast<valtype>(subscript);
+        if (!fSolved) return false;
     }
 
     // Test solution
@@ -1648,6 +1646,127 @@ bool VerifySignature(const CTransaction& txFrom, const CTransaction& txTo, unsig
     return VerifyScript(txin.scriptSig, txout.scriptPubKey, txTo, nIn, fValidatePayToScriptHash, nHashType);
 }
 
+static CScript PushAll(const vector<valtype>& values)
+{
+    CScript result;
+    BOOST_FOREACH(const valtype& v, values)
+        result << v;
+    return result;
+}
+
+static CScript CombineMultisig(CScript scriptPubKey, const CTransaction& txTo, unsigned int nIn,
+                               const vector<valtype>& vSolutions,
+                               vector<valtype>& sigs1, vector<valtype>& sigs2)
+{
+    // Combine all the signatures we've got:
+    set<valtype> allsigs;
+    BOOST_FOREACH(const valtype& v, sigs1)
+    {
+        if (!v.empty())
+            allsigs.insert(v);
+    }
+    BOOST_FOREACH(const valtype& v, sigs2)
+    {
+        if (!v.empty())
+            allsigs.insert(v);
+    }
+
+    // Build a map of pubkey -> signature by matching sigs to pubkeys:
+    int nSigsRequired = vSolutions.front()[0];
+    int nPubKeys = vSolutions.size()-2;
+    map<valtype, valtype> sigs;
+    BOOST_FOREACH(const valtype& sig, allsigs)
+    {
+        for (int i = 0; i < nPubKeys; i++)
+        {
+            const valtype& pubkey = vSolutions[i+1];
+            if (sigs.count(pubkey))
+                continue; // Already got a sig for this pubkey
+
+            if (CheckSig(sig, pubkey, scriptPubKey, txTo, nIn, 0))
+            {
+                sigs[pubkey] = sig;
+                break;
+            }
+        }
+    }
+    // Now build a merged CScript:
+    unsigned int nSigsHave = 0;
+    CScript result; result << OP_0; // pop-one-too-many workaround
+    for (int i = 0; i < nPubKeys && nSigsHave < nSigsRequired; i++)
+    {
+        if (sigs.count(vSolutions[i+1]))
+        {
+            result << sigs[vSolutions[i+1]];
+            ++nSigsHave;
+        }
+    }
+    // Fill any missing with OP_0:
+    for (int i = nSigsHave; i < nSigsRequired; i++)
+        result << OP_0;
+
+    return result;
+}
+
+static CScript CombineSignatures(CScript scriptPubKey, const CTransaction& txTo, unsigned int nIn,
+                                 const txnouttype txType, const vector<valtype>& vSolutions,
+                                 vector<valtype>& sigs1, vector<valtype>& sigs2)
+{
+    switch (txType)
+    {
+    case TX_NONSTANDARD:
+        // Don't know anything about this, assume bigger one is correct:
+        if (sigs1.size() >= sigs2.size())
+            return PushAll(sigs1);
+        return PushAll(sigs2);
+    case TX_PUBKEY:
+    case TX_PUBKEYHASH:
+        // Signatures are bigger than placeholders or empty scripts:
+        if (sigs1.empty() || sigs1[0].empty())
+            return PushAll(sigs2);
+        return PushAll(sigs1);
+    case TX_SCRIPTHASH:
+        if (sigs1.empty() || sigs1.back().empty())
+            return PushAll(sigs2);
+        else if (sigs2.empty() || sigs2.back().empty())
+            return PushAll(sigs1);
+        else
+        {
+            // Recurse to combine:
+            valtype spk = sigs1.back();
+            CScript pubKey2(spk.begin(), spk.end());
+
+            txnouttype txType2;
+            vector<vector<unsigned char> > vSolutions2;
+            Solver(pubKey2, txType2, vSolutions2);
+            sigs1.pop_back();
+            sigs2.pop_back();
+            CScript result = CombineSignatures(pubKey2, txTo, nIn, txType2, vSolutions2, sigs1, sigs2);
+            result << spk;
+            return result;
+        }
+    case TX_MULTISIG:
+        return CombineMultisig(scriptPubKey, txTo, nIn, vSolutions, sigs1, sigs2);
+    }
+
+    return CScript();
+}
+
+CScript CombineSignatures(CScript scriptPubKey, const CTransaction& txTo, unsigned int nIn,
+                          const CScript& scriptSig1, const CScript& scriptSig2)
+{
+    txnouttype txType;
+    vector<vector<unsigned char> > vSolutions;
+    Solver(scriptPubKey, txType, vSolutions);
+
+    vector<valtype> stack1;
+    EvalScript(stack1, scriptSig1, CTransaction(), 0, 0);
+    vector<valtype> stack2;
+    EvalScript(stack2, scriptSig2, CTransaction(), 0, 0);
+
+    return CombineSignatures(scriptPubKey, txTo, nIn, txType, vSolutions, stack1, stack2);
+}
+
 unsigned int CScript::GetSigOpCount(bool fAccurate) const
 {
     unsigned int n = 0;
diff --git a/src/script.h b/src/script.h
index 38f3469364..f4db112dd6 100644
--- a/src/script.h
+++ b/src/script.h
@@ -597,4 +597,8 @@ bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const C
                   bool fValidatePayToScriptHash, int nHashType);
 bool VerifySignature(const CTransaction& txFrom, const CTransaction& txTo, unsigned int nIn, bool fValidatePayToScriptHash, int nHashType);
 
+// Given two sets of signatures for scriptPubKey, possibly with OP_0 placeholders,
+// combine them intelligently and return the result.
+CScript CombineSignatures(CScript scriptPubKey, const CTransaction& txTo, unsigned int nIn, const CScript& scriptSig1, const CScript& scriptSig2);
+
 #endif
diff --git a/src/test/script_tests.cpp b/src/test/script_tests.cpp
index a30e3ccbc2..61d9a64eeb 100644
--- a/src/test/script_tests.cpp
+++ b/src/test/script_tests.cpp
@@ -328,5 +328,118 @@ BOOST_AUTO_TEST_CASE(script_CHECKMULTISIG23)
     BOOST_CHECK(!VerifyScript(badsig6, scriptPubKey23, txTo23, 0, true, 0));
 }    
 
+BOOST_AUTO_TEST_CASE(script_combineSigs)
+{
+    // Test the CombineSignatures function
+    CBasicKeyStore keystore;
+    vector<CKey> keys;
+    for (int i = 0; i < 3; i++)
+    {
+        CKey key;
+        key.MakeNewKey(i%2 == 1);
+        keys.push_back(key);
+        keystore.AddKey(key);
+    }
+
+    CTransaction txFrom;
+    txFrom.vout.resize(1);
+    txFrom.vout[0].scriptPubKey.SetDestination(keys[0].GetPubKey().GetID());
+    CScript& scriptPubKey = txFrom.vout[0].scriptPubKey;
+    CTransaction txTo;
+    txTo.vin.resize(1);
+    txTo.vout.resize(1);
+    txTo.vin[0].prevout.n = 0;
+    txTo.vin[0].prevout.hash = txFrom.GetHash();
+    CScript& scriptSig = txTo.vin[0].scriptSig;
+    txTo.vout[0].nValue = 1;
+
+    CScript empty;
+    CScript combined = CombineSignatures(scriptPubKey, txTo, 0, empty, empty);
+    BOOST_CHECK(combined.empty());
+
+    // Single signature case:
+    SignSignature(keystore, txFrom, txTo, 0); // changes scriptSig
+    combined = CombineSignatures(scriptPubKey, txTo, 0, scriptSig, empty);
+    BOOST_CHECK(combined == scriptSig);
+    combined = CombineSignatures(scriptPubKey, txTo, 0, empty, scriptSig);
+    BOOST_CHECK(combined == scriptSig);
+    CScript scriptSigCopy = scriptSig;
+    // Signing again will give a different, valid signature:
+    SignSignature(keystore, txFrom, txTo, 0);
+    combined = CombineSignatures(scriptPubKey, txTo, 0, scriptSigCopy, scriptSig);
+    BOOST_CHECK(combined == scriptSigCopy || combined == scriptSig);
+
+    // P2SH, single-signature case:
+    CScript pkSingle; pkSingle << keys[0].GetPubKey() << OP_CHECKSIG;
+    keystore.AddCScript(pkSingle);
+    scriptPubKey.SetDestination(pkSingle.GetID());
+    SignSignature(keystore, txFrom, txTo, 0);
+    combined = CombineSignatures(scriptPubKey, txTo, 0, scriptSig, empty);
+    BOOST_CHECK(combined == scriptSig);
+    combined = CombineSignatures(scriptPubKey, txTo, 0, empty, scriptSig);
+    BOOST_CHECK(combined == scriptSig);
+    scriptSigCopy = scriptSig;
+    SignSignature(keystore, txFrom, txTo, 0);
+    combined = CombineSignatures(scriptPubKey, txTo, 0, scriptSigCopy, scriptSig);
+    BOOST_CHECK(combined == scriptSigCopy || combined == scriptSig);
+    // dummy scriptSigCopy with placeholder, should always choose non-placeholder:
+    scriptSigCopy = CScript() << OP_0 << static_cast<vector<unsigned char> >(pkSingle);
+    combined = CombineSignatures(scriptPubKey, txTo, 0, scriptSigCopy, scriptSig);
+    BOOST_CHECK(combined == scriptSig);
+    combined = CombineSignatures(scriptPubKey, txTo, 0, scriptSig, scriptSigCopy);
+    BOOST_CHECK(combined == scriptSig);
+
+    // Hardest case:  Multisig 2-of-3
+    scriptPubKey.SetMultisig(2, keys);
+    keystore.AddCScript(scriptPubKey);
+    SignSignature(keystore, txFrom, txTo, 0);
+    combined = CombineSignatures(scriptPubKey, txTo, 0, scriptSig, empty);
+    BOOST_CHECK(combined == scriptSig);
+    combined = CombineSignatures(scriptPubKey, txTo, 0, empty, scriptSig);
+    BOOST_CHECK(combined == scriptSig);
+
+    // A couple of partially-signed versions:
+    vector<unsigned char> sig1;
+    uint256 hash1 = SignatureHash(scriptPubKey, txTo, 0, SIGHASH_ALL);
+    BOOST_CHECK(keys[0].Sign(hash1, sig1));
+    sig1.push_back(SIGHASH_ALL);
+    vector<unsigned char> sig2;
+    uint256 hash2 = SignatureHash(scriptPubKey, txTo, 0, SIGHASH_NONE);
+    BOOST_CHECK(keys[1].Sign(hash2, sig2));
+    sig2.push_back(SIGHASH_NONE);
+    vector<unsigned char> sig3;
+    uint256 hash3 = SignatureHash(scriptPubKey, txTo, 0, SIGHASH_SINGLE);
+    BOOST_CHECK(keys[2].Sign(hash3, sig3));
+    sig3.push_back(SIGHASH_SINGLE);
+
+    // Not fussy about order (or even existence) of placeholders or signatures:
+    CScript partial1a = CScript() << OP_0 << sig1 << OP_0;
+    CScript partial1b = CScript() << OP_0 << OP_0 << sig1;
+    CScript partial2a = CScript() << OP_0 << sig2;
+    CScript partial2b = CScript() << sig2 << OP_0;
+    CScript partial3a = CScript() << sig3;
+    CScript partial3b = CScript() << OP_0 << OP_0 << sig3;
+    CScript partial3c = CScript() << OP_0 << sig3 << OP_0;
+    CScript complete12 = CScript() << OP_0 << sig1 << sig2;
+    CScript complete13 = CScript() << OP_0 << sig1 << sig3;
+    CScript complete23 = CScript() << OP_0 << sig2 << sig3;
+
+    combined = CombineSignatures(scriptPubKey, txTo, 0, partial1a, partial1b);
+    BOOST_CHECK(combined == partial1a);
+    combined = CombineSignatures(scriptPubKey, txTo, 0, partial1a, partial2a);
+    BOOST_CHECK(combined == complete12);
+    combined = CombineSignatures(scriptPubKey, txTo, 0, partial2a, partial1a);
+    BOOST_CHECK(combined == complete12);
+    combined = CombineSignatures(scriptPubKey, txTo, 0, partial1b, partial2b);
+    BOOST_CHECK(combined == complete12);
+    combined = CombineSignatures(scriptPubKey, txTo, 0, partial3b, partial1b);
+    BOOST_CHECK(combined == complete13);
+    combined = CombineSignatures(scriptPubKey, txTo, 0, partial2a, partial3a);
+    BOOST_CHECK(combined == complete23);
+    combined = CombineSignatures(scriptPubKey, txTo, 0, partial3b, partial2b);
+    BOOST_CHECK(combined == complete23);
+    combined = CombineSignatures(scriptPubKey, txTo, 0, partial3b, partial3a);
+    BOOST_CHECK(combined == partial3c);
+}
 
 BOOST_AUTO_TEST_SUITE_END()
diff --git a/src/wallet.cpp b/src/wallet.cpp
index 127d580803..4d99ce6560 100644
--- a/src/wallet.cpp
+++ b/src/wallet.cpp
@@ -899,7 +899,7 @@ int64 CWallet::GetImmatureBalance() const
 }
 
 // populate vCoins with vector of spendable COutputs
-void CWallet::AvailableCoins(vector<COutput>& vCoins) const
+void CWallet::AvailableCoins(vector<COutput>& vCoins, bool fOnlyConfirmed) const
 {
     vCoins.clear();
 
@@ -909,7 +909,10 @@ void CWallet::AvailableCoins(vector<COutput>& vCoins) const
         {
             const CWalletTx* pcoin = &(*it).second;
 
-            if (!pcoin->IsFinal() || !pcoin->IsConfirmed())
+            if (!pcoin->IsFinal())
+                continue;
+
+            if (fOnlyConfirmed && !pcoin->IsConfirmed())
                 continue;
 
             if (pcoin->IsCoinBase() && pcoin->GetBlocksToMaturity() > 0)
diff --git a/src/wallet.h b/src/wallet.h
index 9807ececd6..5bf38699ef 100644
--- a/src/wallet.h
+++ b/src/wallet.h
@@ -61,7 +61,6 @@ public:
 class CWallet : public CCryptoKeyStore
 {
 private:
-    void AvailableCoins(std::vector<COutput>& vCoins) const;
     bool SelectCoins(int64 nTargetValue, std::set<std::pair<const CWalletTx*,unsigned int> >& setCoinsRet, int64& nValueRet) const;
 
     CWalletDB *pwalletdbEncryption;
@@ -113,6 +112,7 @@ public:
     // check whether we are allowed to upgrade (or already support) to the named feature
     bool CanSupportFeature(enum WalletFeature wf) { return nWalletMaxVersion >= wf; }
 
+    void AvailableCoins(std::vector<COutput>& vCoins, bool fOnlyConfirmed=true) const;
     bool SelectCoinsMinConf(int64 nTargetValue, int nConfMine, int nConfTheirs, std::vector<COutput> vCoins, std::set<std::pair<const CWalletTx*,unsigned int> >& setCoinsRet, int64& nValueRet) const;
 
     // keystore implementation