diff --git a/src/Makefile.am b/src/Makefile.am
index 35fca6570..9b7e99861 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -98,7 +98,12 @@ BITCOIN_CORE_H = \
   rpcclient.h \
   rpcprotocol.h \
   rpcserver.h \
-  script.h \
+  script/interpreter.h \
+  script/compressor.h \
+  script/script.h \
+  script/sign.h \
+  script/standard.h \
+  scriptutils.h \
   serialize.h \
   sync.h \
   threadsafety.h \
@@ -206,7 +211,12 @@ libbitcoin_common_a_SOURCES = \
   keystore.cpp \
   netbase.cpp \
   protocol.cpp \
-  script.cpp \
+  script/interpreter.cpp \
+  script/compressor.cpp \
+  script/script.cpp \
+  script/sign.cpp \
+  script/standard.cpp \
+  scriptutils.cpp \
   $(BITCOIN_CORE_H)
 
 # util: shared between all executables.
diff --git a/src/base58.h b/src/base58.h
index 70681f589..216aca364 100644
--- a/src/base58.h
+++ b/src/base58.h
@@ -16,7 +16,7 @@
 
 #include "chainparams.h"
 #include "key.h"
-#include "script.h"
+#include "script/script.h"
 
 #include <string>
 #include <vector>
diff --git a/src/bitcoin-tx.cpp b/src/bitcoin-tx.cpp
index 5f547bba8..c45535141 100644
--- a/src/bitcoin-tx.cpp
+++ b/src/bitcoin-tx.cpp
@@ -8,6 +8,8 @@
 #include "core.h"
 #include "main.h"         // for MAX_BLOCK_SIZE
 #include "keystore.h"
+#include "script/script.h"
+#include "script/sign.h"
 #include "ui_interface.h" // for _(...)
 #include "univalue/univalue.h"
 #include "core_io.h"
diff --git a/src/bloom.cpp b/src/bloom.cpp
index e34041336..cef74a3a5 100644
--- a/src/bloom.cpp
+++ b/src/bloom.cpp
@@ -5,7 +5,8 @@
 #include "bloom.h"
 
 #include "core.h"
-#include "script.h"
+#include "script/script.h"
+#include "script/standard.h"
 
 #include <math.h>
 #include <stdlib.h>
diff --git a/src/core.h b/src/core.h
index cde8d8b3f..030eb1773 100644
--- a/src/core.h
+++ b/src/core.h
@@ -6,7 +6,8 @@
 #ifndef BITCOIN_CORE_H
 #define BITCOIN_CORE_H
 
-#include "script.h"
+#include "script/compressor.h"
+#include "script/script.h"
 #include "serialize.h"
 #include "uint256.h"
 
diff --git a/src/core_read.cpp b/src/core_read.cpp
index 57f1397f1..efcecb106 100644
--- a/src/core_read.cpp
+++ b/src/core_read.cpp
@@ -5,7 +5,7 @@
 #include "core_io.h"
 #include "core.h"
 #include "serialize.h"
-#include "script.h"
+#include "script/script.h"
 #include "util.h"
 
 #include <boost/assign/list_of.hpp>
diff --git a/src/core_write.cpp b/src/core_write.cpp
index e66e75515..62712b1ba 100644
--- a/src/core_write.cpp
+++ b/src/core_write.cpp
@@ -4,7 +4,8 @@
 
 #include "core_io.h"
 #include "univalue/univalue.h"
-#include "script.h"
+#include "script/script.h"
+#include "script/standard.h"
 #include "core.h"
 #include "serialize.h"
 #include "util.h"
diff --git a/src/crypter.cpp b/src/crypter.cpp
index 8aa2bb051..3df13021d 100644
--- a/src/crypter.cpp
+++ b/src/crypter.cpp
@@ -4,7 +4,7 @@
 
 #include "crypter.h"
 
-#include "script.h"
+#include "script/script.h"
 #include "util.h"
 
 #include <string>
diff --git a/src/keystore.cpp b/src/keystore.cpp
index 72ae9b0a3..98bc0e9e2 100644
--- a/src/keystore.cpp
+++ b/src/keystore.cpp
@@ -7,7 +7,7 @@
 
 #include "crypter.h"
 #include "key.h"
-#include "script.h"
+#include "script/script.h"
 #include "util.h"
 
 #include <boost/foreach.hpp>
diff --git a/src/main.h b/src/main.h
index 8c0a743e2..30cccab2f 100644
--- a/src/main.h
+++ b/src/main.h
@@ -15,7 +15,8 @@
 #include "core.h"
 #include "net.h"
 #include "pow.h"
-#include "script.h"
+#include "script/script.h"
+#include "script/standard.h"
 #include "sync.h"
 #include "txmempool.h"
 #include "uint256.h"
diff --git a/src/qt/transactiondesc.cpp b/src/qt/transactiondesc.cpp
index 8258e719a..727b8dc66 100644
--- a/src/qt/transactiondesc.cpp
+++ b/src/qt/transactiondesc.cpp
@@ -11,7 +11,7 @@
 #include "db.h"
 #include "main.h"
 #include "paymentserver.h"
-#include "script.h"
+#include "script/script.h"
 #include "transactionrecord.h"
 #include "timedata.h"
 #include "ui_interface.h"
diff --git a/src/rpcrawtransaction.cpp b/src/rpcrawtransaction.cpp
index a73641834..b5551524b 100644
--- a/src/rpcrawtransaction.cpp
+++ b/src/rpcrawtransaction.cpp
@@ -11,6 +11,9 @@
 #include "main.h"
 #include "net.h"
 #include "rpcserver.h"
+#include "script/script.h"
+#include "script/standard.h"
+#include "script/sign.h"
 #include "uint256.h"
 #ifdef ENABLE_WALLET
 #include "wallet.h"
diff --git a/src/script/compressor.cpp b/src/script/compressor.cpp
new file mode 100644
index 000000000..2f8df602b
--- /dev/null
+++ b/src/script/compressor.cpp
@@ -0,0 +1,127 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2013 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 "compressor.h"
+
+bool CScriptCompressor::IsToKeyID(CKeyID &hash) const
+{
+    if (script.size() == 25 && script[0] == OP_DUP && script[1] == OP_HASH160
+                            && script[2] == 20 && script[23] == OP_EQUALVERIFY
+                            && script[24] == OP_CHECKSIG) {
+        memcpy(&hash, &script[3], 20);
+        return true;
+    }
+    return false;
+}
+
+bool CScriptCompressor::IsToScriptID(CScriptID &hash) const
+{
+    if (script.size() == 23 && script[0] == OP_HASH160 && script[1] == 20
+                            && script[22] == OP_EQUAL) {
+        memcpy(&hash, &script[2], 20);
+        return true;
+    }
+    return false;
+}
+
+bool CScriptCompressor::IsToPubKey(CPubKey &pubkey) const
+{
+    if (script.size() == 35 && script[0] == 33 && script[34] == OP_CHECKSIG
+                            && (script[1] == 0x02 || script[1] == 0x03)) {
+        pubkey.Set(&script[1], &script[34]);
+        return true;
+    }
+    if (script.size() == 67 && script[0] == 65 && script[66] == OP_CHECKSIG
+                            && script[1] == 0x04) {
+        pubkey.Set(&script[1], &script[66]);
+        return pubkey.IsFullyValid(); // if not fully valid, a case that would not be compressible
+    }
+    return false;
+}
+
+bool CScriptCompressor::Compress(std::vector<unsigned char> &out) const
+{
+    CKeyID keyID;
+    if (IsToKeyID(keyID)) {
+        out.resize(21);
+        out[0] = 0x00;
+        memcpy(&out[1], &keyID, 20);
+        return true;
+    }
+    CScriptID scriptID;
+    if (IsToScriptID(scriptID)) {
+        out.resize(21);
+        out[0] = 0x01;
+        memcpy(&out[1], &scriptID, 20);
+        return true;
+    }
+    CPubKey pubkey;
+    if (IsToPubKey(pubkey)) {
+        out.resize(33);
+        memcpy(&out[1], &pubkey[1], 32);
+        if (pubkey[0] == 0x02 || pubkey[0] == 0x03) {
+            out[0] = pubkey[0];
+            return true;
+        } else if (pubkey[0] == 0x04) {
+            out[0] = 0x04 | (pubkey[64] & 0x01);
+            return true;
+        }
+    }
+    return false;
+}
+
+unsigned int CScriptCompressor::GetSpecialSize(unsigned int nSize) const
+{
+    if (nSize == 0 || nSize == 1)
+        return 20;
+    if (nSize == 2 || nSize == 3 || nSize == 4 || nSize == 5)
+        return 32;
+    return 0;
+}
+
+bool CScriptCompressor::Decompress(unsigned int nSize, const std::vector<unsigned char> &in)
+{
+    switch(nSize) {
+    case 0x00:
+        script.resize(25);
+        script[0] = OP_DUP;
+        script[1] = OP_HASH160;
+        script[2] = 20;
+        memcpy(&script[3], &in[0], 20);
+        script[23] = OP_EQUALVERIFY;
+        script[24] = OP_CHECKSIG;
+        return true;
+    case 0x01:
+        script.resize(23);
+        script[0] = OP_HASH160;
+        script[1] = 20;
+        memcpy(&script[2], &in[0], 20);
+        script[22] = OP_EQUAL;
+        return true;
+    case 0x02:
+    case 0x03:
+        script.resize(35);
+        script[0] = 33;
+        script[1] = nSize;
+        memcpy(&script[2], &in[0], 32);
+        script[34] = OP_CHECKSIG;
+        return true;
+    case 0x04:
+    case 0x05:
+        unsigned char vch[33] = {};
+        vch[0] = nSize - 2;
+        memcpy(&vch[1], &in[0], 32);
+        CPubKey pubkey(&vch[0], &vch[33]);
+        if (!pubkey.Decompress())
+            return false;
+        assert(pubkey.size() == 65);
+        script.resize(67);
+        script[0] = 65;
+        memcpy(&script[1], pubkey.begin(), 65);
+        script[66] = OP_CHECKSIG;
+        return true;
+    }
+    return false;
+}
diff --git a/src/script/compressor.h b/src/script/compressor.h
new file mode 100644
index 000000000..f0a3754f0
--- /dev/null
+++ b/src/script/compressor.h
@@ -0,0 +1,84 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2013 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef H_BITCOIN_SCRIPT_COMPRESSOR
+#define H_BITCOIN_SCRIPT_COMPRESSOR
+
+#include "script/script.h"
+
+/** Compact serializer for scripts.
+ *
+ *  It detects common cases and encodes them much more efficiently.
+ *  3 special cases are defined:
+ *  * Pay to pubkey hash (encoded as 21 bytes)
+ *  * Pay to script hash (encoded as 21 bytes)
+ *  * Pay to pubkey starting with 0x02, 0x03 or 0x04 (encoded as 33 bytes)
+ *
+ *  Other scripts up to 121 bytes require 1 byte + script length. Above
+ *  that, scripts up to 16505 bytes require 2 bytes + script length.
+ */
+class CScriptCompressor
+{
+private:
+    // make this static for now (there are only 6 special scripts defined)
+    // this can potentially be extended together with a new nVersion for
+    // transactions, in which case this value becomes dependent on nVersion
+    // and nHeight of the enclosing transaction.
+    static const unsigned int nSpecialScripts = 6;
+
+    CScript &script;
+protected:
+    // These check for scripts for which a special case with a shorter encoding is defined.
+    // They are implemented separately from the CScript test, as these test for exact byte
+    // sequence correspondences, and are more strict. For example, IsToPubKey also verifies
+    // whether the public key is valid (as invalid ones cannot be represented in compressed
+    // form).
+    bool IsToKeyID(CKeyID &hash) const;
+    bool IsToScriptID(CScriptID &hash) const;
+    bool IsToPubKey(CPubKey &pubkey) const;
+
+    bool Compress(std::vector<unsigned char> &out) const;
+    unsigned int GetSpecialSize(unsigned int nSize) const;
+    bool Decompress(unsigned int nSize, const std::vector<unsigned char> &out);
+public:
+    CScriptCompressor(CScript &scriptIn) : script(scriptIn) { }
+
+    unsigned int GetSerializeSize(int nType, int nVersion) const {
+        std::vector<unsigned char> compr;
+        if (Compress(compr))
+            return compr.size();
+        unsigned int nSize = script.size() + nSpecialScripts;
+        return script.size() + VARINT(nSize).GetSerializeSize(nType, nVersion);
+    }
+
+    template<typename Stream>
+    void Serialize(Stream &s, int nType, int nVersion) const {
+        std::vector<unsigned char> compr;
+        if (Compress(compr)) {
+            s << CFlatData(compr);
+            return;
+        }
+        unsigned int nSize = script.size() + nSpecialScripts;
+        s << VARINT(nSize);
+        s << CFlatData(script);
+    }
+
+    template<typename Stream>
+    void Unserialize(Stream &s, int nType, int nVersion) {
+        unsigned int nSize = 0;
+        s >> VARINT(nSize);
+        if (nSize < nSpecialScripts) {
+            std::vector<unsigned char> vch(GetSpecialSize(nSize), 0x00);
+            s >> REF(CFlatData(vch));
+            Decompress(nSize, vch);
+            return;
+        }
+        nSize -= nSpecialScripts;
+        script.resize(nSize);
+        s >> REF(CFlatData(script));
+    }
+};
+
+#endif
diff --git a/src/script.cpp b/src/script/interpreter.cpp
similarity index 52%
rename from src/script.cpp
rename to src/script/interpreter.cpp
index f3d423a42..4f4fdb6b7 100644
--- a/src/script.cpp
+++ b/src/script/interpreter.cpp
@@ -3,27 +3,21 @@
 // Distributed under the MIT/X11 software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#include "script.h"
+#include "interpreter.h"
 
+#include "core.h"
 #include "crypto/ripemd160.h"
 #include "crypto/sha1.h"
 #include "crypto/sha2.h"
-#include "core.h"
-#include "hash.h"
-#include "key.h"
-#include "keystore.h"
 #include "random.h"
-#include "sync.h"
+#include "script/script.h"
 #include "uint256.h"
 #include "util.h"
 
-#include <boost/foreach.hpp>
 #include <boost/thread.hpp>
-#include <boost/tuple/tuple.hpp>
 #include <boost/tuple/tuple_comparison.hpp>
 
 using namespace std;
-using namespace boost;
 
 typedef vector<unsigned char> valtype;
 static const valtype vchFalse(0);
@@ -34,8 +28,6 @@ static const CScriptNum bnOne(1);
 static const CScriptNum bnFalse(0);
 static const CScriptNum bnTrue(1);
 
-bool CheckSig(vector<unsigned char> vchSig, const vector<unsigned char> &vchPubKey, const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, int flags);
-
 bool CastToBool(const valtype& vch)
 {
     for (unsigned int i = 0; i < vch.size(); i++)
@@ -51,8 +43,6 @@ bool CastToBool(const valtype& vch)
     return false;
 }
 
-
-
 //
 // Script is a stack machine (like Forth) that evaluates a predicate
 // returning a bool indicating valid or not.  There are no loops.
@@ -66,165 +56,6 @@ static inline void popstack(vector<valtype>& stack)
     stack.pop_back();
 }
 
-
-const char* GetTxnOutputType(txnouttype t)
-{
-    switch (t)
-    {
-    case TX_NONSTANDARD: return "nonstandard";
-    case TX_PUBKEY: return "pubkey";
-    case TX_PUBKEYHASH: return "pubkeyhash";
-    case TX_SCRIPTHASH: return "scripthash";
-    case TX_MULTISIG: return "multisig";
-    case TX_NULL_DATA: return "nulldata";
-    }
-    return NULL;
-}
-
-
-const char* GetOpName(opcodetype opcode)
-{
-    switch (opcode)
-    {
-    // push value
-    case OP_0                      : return "0";
-    case OP_PUSHDATA1              : return "OP_PUSHDATA1";
-    case OP_PUSHDATA2              : return "OP_PUSHDATA2";
-    case OP_PUSHDATA4              : return "OP_PUSHDATA4";
-    case OP_1NEGATE                : return "-1";
-    case OP_RESERVED               : return "OP_RESERVED";
-    case OP_1                      : return "1";
-    case OP_2                      : return "2";
-    case OP_3                      : return "3";
-    case OP_4                      : return "4";
-    case OP_5                      : return "5";
-    case OP_6                      : return "6";
-    case OP_7                      : return "7";
-    case OP_8                      : return "8";
-    case OP_9                      : return "9";
-    case OP_10                     : return "10";
-    case OP_11                     : return "11";
-    case OP_12                     : return "12";
-    case OP_13                     : return "13";
-    case OP_14                     : return "14";
-    case OP_15                     : return "15";
-    case OP_16                     : return "16";
-
-    // control
-    case OP_NOP                    : return "OP_NOP";
-    case OP_VER                    : return "OP_VER";
-    case OP_IF                     : return "OP_IF";
-    case OP_NOTIF                  : return "OP_NOTIF";
-    case OP_VERIF                  : return "OP_VERIF";
-    case OP_VERNOTIF               : return "OP_VERNOTIF";
-    case OP_ELSE                   : return "OP_ELSE";
-    case OP_ENDIF                  : return "OP_ENDIF";
-    case OP_VERIFY                 : return "OP_VERIFY";
-    case OP_RETURN                 : return "OP_RETURN";
-
-    // stack ops
-    case OP_TOALTSTACK             : return "OP_TOALTSTACK";
-    case OP_FROMALTSTACK           : return "OP_FROMALTSTACK";
-    case OP_2DROP                  : return "OP_2DROP";
-    case OP_2DUP                   : return "OP_2DUP";
-    case OP_3DUP                   : return "OP_3DUP";
-    case OP_2OVER                  : return "OP_2OVER";
-    case OP_2ROT                   : return "OP_2ROT";
-    case OP_2SWAP                  : return "OP_2SWAP";
-    case OP_IFDUP                  : return "OP_IFDUP";
-    case OP_DEPTH                  : return "OP_DEPTH";
-    case OP_DROP                   : return "OP_DROP";
-    case OP_DUP                    : return "OP_DUP";
-    case OP_NIP                    : return "OP_NIP";
-    case OP_OVER                   : return "OP_OVER";
-    case OP_PICK                   : return "OP_PICK";
-    case OP_ROLL                   : return "OP_ROLL";
-    case OP_ROT                    : return "OP_ROT";
-    case OP_SWAP                   : return "OP_SWAP";
-    case OP_TUCK                   : return "OP_TUCK";
-
-    // splice ops
-    case OP_CAT                    : return "OP_CAT";
-    case OP_SUBSTR                 : return "OP_SUBSTR";
-    case OP_LEFT                   : return "OP_LEFT";
-    case OP_RIGHT                  : return "OP_RIGHT";
-    case OP_SIZE                   : return "OP_SIZE";
-
-    // bit logic
-    case OP_INVERT                 : return "OP_INVERT";
-    case OP_AND                    : return "OP_AND";
-    case OP_OR                     : return "OP_OR";
-    case OP_XOR                    : return "OP_XOR";
-    case OP_EQUAL                  : return "OP_EQUAL";
-    case OP_EQUALVERIFY            : return "OP_EQUALVERIFY";
-    case OP_RESERVED1              : return "OP_RESERVED1";
-    case OP_RESERVED2              : return "OP_RESERVED2";
-
-    // numeric
-    case OP_1ADD                   : return "OP_1ADD";
-    case OP_1SUB                   : return "OP_1SUB";
-    case OP_2MUL                   : return "OP_2MUL";
-    case OP_2DIV                   : return "OP_2DIV";
-    case OP_NEGATE                 : return "OP_NEGATE";
-    case OP_ABS                    : return "OP_ABS";
-    case OP_NOT                    : return "OP_NOT";
-    case OP_0NOTEQUAL              : return "OP_0NOTEQUAL";
-    case OP_ADD                    : return "OP_ADD";
-    case OP_SUB                    : return "OP_SUB";
-    case OP_MUL                    : return "OP_MUL";
-    case OP_DIV                    : return "OP_DIV";
-    case OP_MOD                    : return "OP_MOD";
-    case OP_LSHIFT                 : return "OP_LSHIFT";
-    case OP_RSHIFT                 : return "OP_RSHIFT";
-    case OP_BOOLAND                : return "OP_BOOLAND";
-    case OP_BOOLOR                 : return "OP_BOOLOR";
-    case OP_NUMEQUAL               : return "OP_NUMEQUAL";
-    case OP_NUMEQUALVERIFY         : return "OP_NUMEQUALVERIFY";
-    case OP_NUMNOTEQUAL            : return "OP_NUMNOTEQUAL";
-    case OP_LESSTHAN               : return "OP_LESSTHAN";
-    case OP_GREATERTHAN            : return "OP_GREATERTHAN";
-    case OP_LESSTHANOREQUAL        : return "OP_LESSTHANOREQUAL";
-    case OP_GREATERTHANOREQUAL     : return "OP_GREATERTHANOREQUAL";
-    case OP_MIN                    : return "OP_MIN";
-    case OP_MAX                    : return "OP_MAX";
-    case OP_WITHIN                 : return "OP_WITHIN";
-
-    // crypto
-    case OP_RIPEMD160              : return "OP_RIPEMD160";
-    case OP_SHA1                   : return "OP_SHA1";
-    case OP_SHA256                 : return "OP_SHA256";
-    case OP_HASH160                : return "OP_HASH160";
-    case OP_HASH256                : return "OP_HASH256";
-    case OP_CODESEPARATOR          : return "OP_CODESEPARATOR";
-    case OP_CHECKSIG               : return "OP_CHECKSIG";
-    case OP_CHECKSIGVERIFY         : return "OP_CHECKSIGVERIFY";
-    case OP_CHECKMULTISIG          : return "OP_CHECKMULTISIG";
-    case OP_CHECKMULTISIGVERIFY    : return "OP_CHECKMULTISIGVERIFY";
-
-    // expanson
-    case OP_NOP1                   : return "OP_NOP1";
-    case OP_NOP2                   : return "OP_NOP2";
-    case OP_NOP3                   : return "OP_NOP3";
-    case OP_NOP4                   : return "OP_NOP4";
-    case OP_NOP5                   : return "OP_NOP5";
-    case OP_NOP6                   : return "OP_NOP6";
-    case OP_NOP7                   : return "OP_NOP7";
-    case OP_NOP8                   : return "OP_NOP8";
-    case OP_NOP9                   : return "OP_NOP9";
-    case OP_NOP10                  : return "OP_NOP10";
-
-    case OP_INVALIDOPCODE          : return "OP_INVALIDOPCODE";
-
-    // Note:
-    //  The template matching params OP_SMALLDATA/etc are defined in opcodetype enum
-    //  as kind of implementation hack, they are *NOT* real opcodes.  If found in real
-    //  Script, just let the default: case deal with them.
-
-    default:
-        return "OP_UNKNOWN";
-    }
-}
-
 bool IsCanonicalPubKey(const valtype &vchPubKey, unsigned int flags) {
     if (!(flags & SCRIPT_VERIFY_STRICTENC))
         return true;
@@ -962,19 +793,12 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
         return false;
     }
 
-
     if (!vfExec.empty())
         return false;
 
     return true;
 }
 
-
-
-
-
-
-
 namespace {
 
 /** Wrapper that serializes like CTransaction, but with the modifications
@@ -1151,8 +975,7 @@ public:
     }
 };
 
-bool CheckSig(vector<unsigned char> vchSig, const vector<unsigned char> &vchPubKey, const CScript &scriptCode,
-              const CTransaction& txTo, unsigned int nIn, int nHashType, int flags)
+bool CheckSig(vector<unsigned char> vchSig, const vector<unsigned char> &vchPubKey, const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, int flags)
 {
     static CSignatureCache signatureCache;
 
@@ -1183,426 +1006,6 @@ bool CheckSig(vector<unsigned char> vchSig, const vector<unsigned char> &vchPubK
     return true;
 }
 
-
-
-
-
-
-
-
-
-//
-// Return public keys or hashes from scriptPubKey, for 'standard' transaction types.
-//
-bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, vector<vector<unsigned char> >& vSolutionsRet)
-{
-    // Templates
-    static multimap<txnouttype, CScript> mTemplates;
-    if (mTemplates.empty())
-    {
-        // Standard tx, sender provides pubkey, receiver adds signature
-        mTemplates.insert(make_pair(TX_PUBKEY, CScript() << OP_PUBKEY << OP_CHECKSIG));
-
-        // Bitcoin address tx, sender provides hash of pubkey, receiver provides signature and pubkey
-        mTemplates.insert(make_pair(TX_PUBKEYHASH, CScript() << OP_DUP << OP_HASH160 << OP_PUBKEYHASH << OP_EQUALVERIFY << OP_CHECKSIG));
-
-        // Sender provides N pubkeys, receivers provides M signatures
-        mTemplates.insert(make_pair(TX_MULTISIG, CScript() << OP_SMALLINTEGER << OP_PUBKEYS << OP_SMALLINTEGER << OP_CHECKMULTISIG));
-
-        // Empty, provably prunable, data-carrying output
-        if (GetBoolArg("-datacarrier", true))
-            mTemplates.insert(make_pair(TX_NULL_DATA, CScript() << OP_RETURN << OP_SMALLDATA));
-        mTemplates.insert(make_pair(TX_NULL_DATA, CScript() << OP_RETURN));
-    }
-
-    // Shortcut for pay-to-script-hash, which are more constrained than the other types:
-    // it is always OP_HASH160 20 [20 byte hash] OP_EQUAL
-    if (scriptPubKey.IsPayToScriptHash())
-    {
-        typeRet = TX_SCRIPTHASH;
-        vector<unsigned char> hashBytes(scriptPubKey.begin()+2, scriptPubKey.begin()+22);
-        vSolutionsRet.push_back(hashBytes);
-        return true;
-    }
-
-    // Scan templates
-    const CScript& script1 = scriptPubKey;
-    BOOST_FOREACH(const PAIRTYPE(txnouttype, CScript)& tplate, mTemplates)
-    {
-        const CScript& script2 = tplate.second;
-        vSolutionsRet.clear();
-
-        opcodetype opcode1, opcode2;
-        vector<unsigned char> vch1, vch2;
-
-        // Compare
-        CScript::const_iterator pc1 = script1.begin();
-        CScript::const_iterator pc2 = script2.begin();
-        while (true)
-        {
-            if (pc1 == script1.end() && pc2 == script2.end())
-            {
-                // Found a match
-                typeRet = tplate.first;
-                if (typeRet == TX_MULTISIG)
-                {
-                    // Additional checks for TX_MULTISIG:
-                    unsigned char m = vSolutionsRet.front()[0];
-                    unsigned char n = vSolutionsRet.back()[0];
-                    if (m < 1 || n < 1 || m > n || vSolutionsRet.size()-2 != n)
-                        return false;
-                }
-                return true;
-            }
-            if (!script1.GetOp(pc1, opcode1, vch1))
-                break;
-            if (!script2.GetOp(pc2, opcode2, vch2))
-                break;
-
-            // Template matching opcodes:
-            if (opcode2 == OP_PUBKEYS)
-            {
-                while (vch1.size() >= 33 && vch1.size() <= 65)
-                {
-                    vSolutionsRet.push_back(vch1);
-                    if (!script1.GetOp(pc1, opcode1, vch1))
-                        break;
-                }
-                if (!script2.GetOp(pc2, opcode2, vch2))
-                    break;
-                // Normal situation is to fall through
-                // to other if/else statements
-            }
-
-            if (opcode2 == OP_PUBKEY)
-            {
-                if (vch1.size() < 33 || vch1.size() > 65)
-                    break;
-                vSolutionsRet.push_back(vch1);
-            }
-            else if (opcode2 == OP_PUBKEYHASH)
-            {
-                if (vch1.size() != sizeof(uint160))
-                    break;
-                vSolutionsRet.push_back(vch1);
-            }
-            else if (opcode2 == OP_SMALLINTEGER)
-            {   // Single-byte small integer pushed onto vSolutions
-                if (opcode1 == OP_0 ||
-                    (opcode1 >= OP_1 && opcode1 <= OP_16))
-                {
-                    char n = (char)CScript::DecodeOP_N(opcode1);
-                    vSolutionsRet.push_back(valtype(1, n));
-                }
-                else
-                    break;
-            }
-            else if (opcode2 == OP_SMALLDATA)
-            {
-                // small pushdata, <= MAX_OP_RETURN_RELAY bytes
-                if (vch1.size() > MAX_OP_RETURN_RELAY)
-                    break;
-            }
-            else if (opcode1 != opcode2 || vch1 != vch2)
-            {
-                // Others must match exactly
-                break;
-            }
-        }
-    }
-
-    vSolutionsRet.clear();
-    typeRet = TX_NONSTANDARD;
-    return false;
-}
-
-
-bool Sign1(const CKeyID& address, const CKeyStore& keystore, uint256 hash, int nHashType, CScript& scriptSigRet)
-{
-    CKey key;
-    if (!keystore.GetKey(address, key))
-        return false;
-
-    vector<unsigned char> vchSig;
-    if (!key.Sign(hash, vchSig))
-        return false;
-    vchSig.push_back((unsigned char)nHashType);
-    scriptSigRet << vchSig;
-
-    return true;
-}
-
-bool SignN(const vector<valtype>& multisigdata, const CKeyStore& keystore, uint256 hash, int nHashType, CScript& scriptSigRet)
-{
-    int nSigned = 0;
-    int nRequired = multisigdata.front()[0];
-    for (unsigned int i = 1; i < multisigdata.size()-1 && nSigned < nRequired; i++)
-    {
-        const valtype& pubkey = multisigdata[i];
-        CKeyID keyID = CPubKey(pubkey).GetID();
-        if (Sign1(keyID, keystore, hash, nHashType, scriptSigRet))
-            ++nSigned;
-    }
-    return nSigned==nRequired;
-}
-
-//
-// Sign scriptPubKey with private keys stored in keystore, given transaction hash and hash type.
-// Signatures are returned in scriptSigRet (or returns false if scriptPubKey can't be signed),
-// unless whichTypeRet is TX_SCRIPTHASH, in which case scriptSigRet is the redemption script.
-// Returns false if scriptPubKey could not be completely satisfied.
-//
-bool Solver(const CKeyStore& keystore, const CScript& scriptPubKey, uint256 hash, int nHashType,
-                  CScript& scriptSigRet, txnouttype& whichTypeRet)
-{
-    scriptSigRet.clear();
-
-    vector<valtype> vSolutions;
-    if (!Solver(scriptPubKey, whichTypeRet, vSolutions))
-        return false;
-
-    CKeyID keyID;
-    switch (whichTypeRet)
-    {
-    case TX_NONSTANDARD:
-    case TX_NULL_DATA:
-        return false;
-    case TX_PUBKEY:
-        keyID = CPubKey(vSolutions[0]).GetID();
-        return Sign1(keyID, keystore, hash, nHashType, scriptSigRet);
-    case TX_PUBKEYHASH:
-        keyID = CKeyID(uint160(vSolutions[0]));
-        if (!Sign1(keyID, keystore, hash, nHashType, scriptSigRet))
-            return false;
-        else
-        {
-            CPubKey vch;
-            keystore.GetPubKey(keyID, vch);
-            scriptSigRet << vch;
-        }
-        return true;
-    case TX_SCRIPTHASH:
-        return keystore.GetCScript(uint160(vSolutions[0]), scriptSigRet);
-
-    case TX_MULTISIG:
-        scriptSigRet << OP_0; // workaround CHECKMULTISIG bug
-        return (SignN(vSolutions, keystore, hash, nHashType, scriptSigRet));
-    }
-    return false;
-}
-
-int ScriptSigArgsExpected(txnouttype t, const std::vector<std::vector<unsigned char> >& vSolutions)
-{
-    switch (t)
-    {
-    case TX_NONSTANDARD:
-    case TX_NULL_DATA:
-        return -1;
-    case TX_PUBKEY:
-        return 1;
-    case TX_PUBKEYHASH:
-        return 2;
-    case TX_MULTISIG:
-        if (vSolutions.size() < 1 || vSolutions[0].size() < 1)
-            return -1;
-        return vSolutions[0][0] + 1;
-    case TX_SCRIPTHASH:
-        return 1; // doesn't include args needed by the script
-    }
-    return -1;
-}
-
-bool IsStandard(const CScript& scriptPubKey, txnouttype& whichType)
-{
-    vector<valtype> vSolutions;
-    if (!Solver(scriptPubKey, whichType, vSolutions))
-        return false;
-
-    if (whichType == TX_MULTISIG)
-    {
-        unsigned char m = vSolutions.front()[0];
-        unsigned char n = vSolutions.back()[0];
-        // Support up to x-of-3 multisig txns as standard
-        if (n < 1 || n > 3)
-            return false;
-        if (m < 1 || m > n)
-            return false;
-    }
-
-    return whichType != TX_NONSTANDARD;
-}
-
-
-unsigned int HaveKeys(const vector<valtype>& pubkeys, const CKeyStore& keystore)
-{
-    unsigned int nResult = 0;
-    BOOST_FOREACH(const valtype& pubkey, pubkeys)
-    {
-        CKeyID keyID = CPubKey(pubkey).GetID();
-        if (keystore.HaveKey(keyID))
-            ++nResult;
-    }
-    return nResult;
-}
-
-isminetype IsMine(const CKeyStore &keystore, const CTxDestination& dest)
-{
-    CScript script;
-    script.SetDestination(dest);
-    return IsMine(keystore, script);
-}
-
-isminetype IsMine(const CKeyStore &keystore, const CScript& scriptPubKey)
-{
-    vector<valtype> vSolutions;
-    txnouttype whichType;
-    if (!Solver(scriptPubKey, whichType, vSolutions)) {
-        if (keystore.HaveWatchOnly(scriptPubKey))
-            return ISMINE_WATCH_ONLY;
-        return ISMINE_NO;
-    }
-
-    CKeyID keyID;
-    switch (whichType)
-    {
-    case TX_NONSTANDARD:
-    case TX_NULL_DATA:
-        break;
-    case TX_PUBKEY:
-        keyID = CPubKey(vSolutions[0]).GetID();
-        if (keystore.HaveKey(keyID))
-            return ISMINE_SPENDABLE;
-        break;
-    case TX_PUBKEYHASH:
-        keyID = CKeyID(uint160(vSolutions[0]));
-        if (keystore.HaveKey(keyID))
-            return ISMINE_SPENDABLE;
-        break;
-    case TX_SCRIPTHASH:
-    {
-        CScriptID scriptID = CScriptID(uint160(vSolutions[0]));
-        CScript subscript;
-        if (keystore.GetCScript(scriptID, subscript)) {
-            isminetype ret = IsMine(keystore, subscript);
-            if (ret == ISMINE_SPENDABLE)
-                return ret;
-        }
-        break;
-    }
-    case TX_MULTISIG:
-    {
-        // Only consider transactions "mine" if we own ALL the
-        // keys involved. multi-signature transactions that are
-        // partially owned (somebody else has a key that can spend
-        // them) enable spend-out-from-under-you attacks, especially
-        // in shared-wallet situations.
-        vector<valtype> keys(vSolutions.begin()+1, vSolutions.begin()+vSolutions.size()-1);
-        if (HaveKeys(keys, keystore) == keys.size())
-            return ISMINE_SPENDABLE;
-        break;
-    }
-    }
-
-    if (keystore.HaveWatchOnly(scriptPubKey))
-        return ISMINE_WATCH_ONLY;
-    return ISMINE_NO;
-}
-
-bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet)
-{
-    vector<valtype> vSolutions;
-    txnouttype whichType;
-    if (!Solver(scriptPubKey, whichType, vSolutions))
-        return false;
-
-    if (whichType == TX_PUBKEY)
-    {
-        addressRet = CPubKey(vSolutions[0]).GetID();
-        return true;
-    }
-    else if (whichType == TX_PUBKEYHASH)
-    {
-        addressRet = CKeyID(uint160(vSolutions[0]));
-        return true;
-    }
-    else if (whichType == TX_SCRIPTHASH)
-    {
-        addressRet = CScriptID(uint160(vSolutions[0]));
-        return true;
-    }
-    // Multisig txns have more than one address...
-    return false;
-}
-
-bool ExtractDestinations(const CScript& scriptPubKey, txnouttype& typeRet, vector<CTxDestination>& addressRet, int& nRequiredRet)
-{
-    addressRet.clear();
-    typeRet = TX_NONSTANDARD;
-    vector<valtype> vSolutions;
-    if (!Solver(scriptPubKey, typeRet, vSolutions))
-        return false;
-    if (typeRet == TX_NULL_DATA){
-        // This is data, not addresses
-        return false;
-    }
-
-    if (typeRet == TX_MULTISIG)
-    {
-        nRequiredRet = vSolutions.front()[0];
-        for (unsigned int i = 1; i < vSolutions.size()-1; i++)
-        {
-            CTxDestination address = CPubKey(vSolutions[i]).GetID();
-            addressRet.push_back(address);
-        }
-    }
-    else
-    {
-        nRequiredRet = 1;
-        CTxDestination address;
-        if (!ExtractDestination(scriptPubKey, address))
-           return false;
-        addressRet.push_back(address);
-    }
-
-    return true;
-}
-
-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 ExtractAffectedKeys(const CKeyStore &keystore, const CScript& scriptPubKey, std::vector<CKeyID> &vKeys) {
-    CAffectedKeysVisitor(keystore, vKeys).Process(scriptPubKey);
-}
-
 bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CTransaction& txTo, unsigned int nIn,
                   unsigned int flags, int nHashType)
 {
@@ -1643,437 +1046,3 @@ bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const C
 
     return true;
 }
-
-
-bool SignSignature(const CKeyStore &keystore, const CScript& fromPubKey, CMutableTransaction& txTo, unsigned int nIn, int nHashType)
-{
-    assert(nIn < txTo.vin.size());
-    CTxIn& txin = txTo.vin[nIn];
-
-    // Leave out the signature from the hash, since a signature can't sign itself.
-    // The checksig op will also drop the signatures from its hash.
-    uint256 hash = SignatureHash(fromPubKey, txTo, nIn, nHashType);
-
-    txnouttype whichType;
-    if (!Solver(keystore, fromPubKey, hash, nHashType, txin.scriptSig, whichType))
-        return false;
-
-    if (whichType == TX_SCRIPTHASH)
-    {
-        // Solver returns the subscript that need to be evaluated;
-        // the final scriptSig is the signatures from that
-        // and then the serialized subscript:
-        CScript subscript = txin.scriptSig;
-
-        // Recompute txn hash using subscript in place of scriptPubKey:
-        uint256 hash2 = SignatureHash(subscript, txTo, nIn, nHashType);
-
-        txnouttype subType;
-        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
-    return VerifyScript(txin.scriptSig, fromPubKey, txTo, nIn, STANDARD_SCRIPT_VERIFY_FLAGS, 0);
-}
-
-bool SignSignature(const CKeyStore &keystore, const CTransaction& txFrom, CMutableTransaction& txTo, unsigned int nIn, int nHashType)
-{
-    assert(nIn < txTo.vin.size());
-    CTxIn& txin = txTo.vin[nIn];
-    assert(txin.prevout.n < txFrom.vout.size());
-    const CTxOut& txout = txFrom.vout[txin.prevout.n];
-
-    return SignSignature(keystore, txout.scriptPubKey, txTo, nIn, 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 CMutableTransaction& 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:
-    assert(vSolutions.size() > 1);
-    unsigned int nSigsRequired = vSolutions.front()[0];
-    unsigned int nPubKeys = vSolutions.size()-2;
-    map<valtype, valtype> sigs;
-    BOOST_FOREACH(const valtype& sig, allsigs)
-    {
-        for (unsigned 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, 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 (unsigned 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 (unsigned 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:
-    case TX_NULL_DATA:
-        // 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
-        {
-            // Recur 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, SCRIPT_VERIFY_STRICTENC, 0);
-    vector<valtype> stack2;
-    EvalScript(stack2, scriptSig2, CTransaction(), 0, SCRIPT_VERIFY_STRICTENC, 0);
-
-    return CombineSignatures(scriptPubKey, txTo, nIn, txType, vSolutions, stack1, stack2);
-}
-
-unsigned int CScript::GetSigOpCount(bool fAccurate) const
-{
-    unsigned int n = 0;
-    const_iterator pc = begin();
-    opcodetype lastOpcode = OP_INVALIDOPCODE;
-    while (pc < end())
-    {
-        opcodetype opcode;
-        if (!GetOp(pc, opcode))
-            break;
-        if (opcode == OP_CHECKSIG || opcode == OP_CHECKSIGVERIFY)
-            n++;
-        else if (opcode == OP_CHECKMULTISIG || opcode == OP_CHECKMULTISIGVERIFY)
-        {
-            if (fAccurate && lastOpcode >= OP_1 && lastOpcode <= OP_16)
-                n += DecodeOP_N(lastOpcode);
-            else
-                n += 20;
-        }
-        lastOpcode = opcode;
-    }
-    return n;
-}
-
-unsigned int CScript::GetSigOpCount(const CScript& scriptSig) const
-{
-    if (!IsPayToScriptHash())
-        return GetSigOpCount(true);
-
-    // This is a pay-to-script-hash scriptPubKey;
-    // get the last item that the scriptSig
-    // pushes onto the stack:
-    const_iterator pc = scriptSig.begin();
-    vector<unsigned char> data;
-    while (pc < scriptSig.end())
-    {
-        opcodetype opcode;
-        if (!scriptSig.GetOp(pc, opcode, data))
-            return 0;
-        if (opcode > OP_16)
-            return 0;
-    }
-
-    /// ... and return its opcount:
-    CScript subscript(data.begin(), data.end());
-    return subscript.GetSigOpCount(true);
-}
-
-bool CScript::IsPayToScriptHash() const
-{
-    // Extra-fast test for pay-to-script-hash CScripts:
-    return (this->size() == 23 &&
-            this->at(0) == OP_HASH160 &&
-            this->at(1) == 0x14 &&
-            this->at(22) == OP_EQUAL);
-}
-
-bool CScript::IsPushOnly() const
-{
-    const_iterator pc = begin();
-    while (pc < end())
-    {
-        // Note how a script with an invalid PUSHDATA returns False.
-        opcodetype opcode;
-        if (!GetOp(pc, opcode))
-            return false;
-
-        // Note that IsPushOnly() *does* consider OP_RESERVED to be a
-        // push-type opcode, however execution of OP_RESERVED fails, so
-        // it's not relevant to P2SH as the scriptSig would fail prior to
-        // the P2SH special validation code being executed.
-        if (opcode > OP_16)
-            return false;
-    }
-    return true;
-}
-
-bool CScript::HasCanonicalPushes() const
-{
-    const_iterator pc = begin();
-    while (pc < end())
-    {
-        opcodetype opcode;
-        std::vector<unsigned char> data;
-        if (!GetOp(pc, opcode, data))
-            return false;
-        if (opcode > OP_16)
-            continue;
-        if (opcode < OP_PUSHDATA1 && opcode > OP_0 && (data.size() == 1 && data[0] <= 16))
-            // Could have used an OP_n code, rather than a 1-byte push.
-            return false;
-        if (opcode == OP_PUSHDATA1 && data.size() < OP_PUSHDATA1)
-            // Could have used a normal n-byte push, rather than OP_PUSHDATA1.
-            return false;
-        if (opcode == OP_PUSHDATA2 && data.size() <= 0xFF)
-            // Could have used an OP_PUSHDATA1.
-            return false;
-        if (opcode == OP_PUSHDATA4 && data.size() <= 0xFFFF)
-            // Could have used an OP_PUSHDATA2.
-            return false;
-    }
-    return true;
-}
-
-class CScriptVisitor : public boost::static_visitor<bool>
-{
-private:
-    CScript *script;
-public:
-    CScriptVisitor(CScript *scriptin) { script = scriptin; }
-
-    bool operator()(const CNoDestination &dest) const {
-        script->clear();
-        return false;
-    }
-
-    bool operator()(const CKeyID &keyID) const {
-        script->clear();
-        *script << OP_DUP << OP_HASH160 << keyID << OP_EQUALVERIFY << OP_CHECKSIG;
-        return true;
-    }
-
-    bool operator()(const CScriptID &scriptID) const {
-        script->clear();
-        *script << OP_HASH160 << scriptID << OP_EQUAL;
-        return true;
-    }
-};
-
-void CScript::SetDestination(const CTxDestination& dest)
-{
-    boost::apply_visitor(CScriptVisitor(this), dest);
-}
-
-void CScript::SetMultisig(int nRequired, const std::vector<CPubKey>& keys)
-{
-    this->clear();
-
-    *this << EncodeOP_N(nRequired);
-    BOOST_FOREACH(const CPubKey& key, keys)
-        *this << key;
-    *this << EncodeOP_N(keys.size()) << OP_CHECKMULTISIG;
-}
-
-bool CScriptCompressor::IsToKeyID(CKeyID &hash) const
-{
-    if (script.size() == 25 && script[0] == OP_DUP && script[1] == OP_HASH160
-                            && script[2] == 20 && script[23] == OP_EQUALVERIFY
-                            && script[24] == OP_CHECKSIG) {
-        memcpy(&hash, &script[3], 20);
-        return true;
-    }
-    return false;
-}
-
-bool CScriptCompressor::IsToScriptID(CScriptID &hash) const
-{
-    if (script.size() == 23 && script[0] == OP_HASH160 && script[1] == 20
-                            && script[22] == OP_EQUAL) {
-        memcpy(&hash, &script[2], 20);
-        return true;
-    }
-    return false;
-}
-
-bool CScriptCompressor::IsToPubKey(CPubKey &pubkey) const
-{
-    if (script.size() == 35 && script[0] == 33 && script[34] == OP_CHECKSIG
-                            && (script[1] == 0x02 || script[1] == 0x03)) {
-        pubkey.Set(&script[1], &script[34]);
-        return true;
-    }
-    if (script.size() == 67 && script[0] == 65 && script[66] == OP_CHECKSIG
-                            && script[1] == 0x04) {
-        pubkey.Set(&script[1], &script[66]);
-        return pubkey.IsFullyValid(); // if not fully valid, a case that would not be compressible
-    }
-    return false;
-}
-
-bool CScriptCompressor::Compress(std::vector<unsigned char> &out) const
-{
-    CKeyID keyID;
-    if (IsToKeyID(keyID)) {
-        out.resize(21);
-        out[0] = 0x00;
-        memcpy(&out[1], &keyID, 20);
-        return true;
-    }
-    CScriptID scriptID;
-    if (IsToScriptID(scriptID)) {
-        out.resize(21);
-        out[0] = 0x01;
-        memcpy(&out[1], &scriptID, 20);
-        return true;
-    }
-    CPubKey pubkey;
-    if (IsToPubKey(pubkey)) {
-        out.resize(33);
-        memcpy(&out[1], &pubkey[1], 32);
-        if (pubkey[0] == 0x02 || pubkey[0] == 0x03) {
-            out[0] = pubkey[0];
-            return true;
-        } else if (pubkey[0] == 0x04) {
-            out[0] = 0x04 | (pubkey[64] & 0x01);
-            return true;
-        }
-    }
-    return false;
-}
-
-unsigned int CScriptCompressor::GetSpecialSize(unsigned int nSize) const
-{
-    if (nSize == 0 || nSize == 1)
-        return 20;
-    if (nSize == 2 || nSize == 3 || nSize == 4 || nSize == 5)
-        return 32;
-    return 0;
-}
-
-bool CScriptCompressor::Decompress(unsigned int nSize, const std::vector<unsigned char> &in)
-{
-    switch(nSize) {
-    case 0x00:
-        script.resize(25);
-        script[0] = OP_DUP;
-        script[1] = OP_HASH160;
-        script[2] = 20;
-        memcpy(&script[3], &in[0], 20);
-        script[23] = OP_EQUALVERIFY;
-        script[24] = OP_CHECKSIG;
-        return true;
-    case 0x01:
-        script.resize(23);
-        script[0] = OP_HASH160;
-        script[1] = 20;
-        memcpy(&script[2], &in[0], 20);
-        script[22] = OP_EQUAL;
-        return true;
-    case 0x02:
-    case 0x03:
-        script.resize(35);
-        script[0] = 33;
-        script[1] = nSize;
-        memcpy(&script[2], &in[0], 32);
-        script[34] = OP_CHECKSIG;
-        return true;
-    case 0x04:
-    case 0x05:
-        unsigned char vch[33] = {};
-        vch[0] = nSize - 2;
-        memcpy(&vch[1], &in[0], 32);
-        CPubKey pubkey(&vch[0], &vch[33]);
-        if (!pubkey.Decompress())
-            return false;
-        assert(pubkey.size() == 65);
-        script.resize(67);
-        script[0] = 65;
-        memcpy(&script[1], pubkey.begin(), 65);
-        script[66] = OP_CHECKSIG;
-        return true;
-    }
-    return false;
-}
diff --git a/src/script/interpreter.h b/src/script/interpreter.h
new file mode 100644
index 000000000..0c6f8b9d1
--- /dev/null
+++ b/src/script/interpreter.h
@@ -0,0 +1,45 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2013 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef H_BITCOIN_SCRIPT_INTERPRETER
+#define H_BITCOIN_SCRIPT_INTERPRETER
+
+#include <vector>
+#include <stdint.h>
+#include <string>
+
+class uint256;
+class CScript;
+class CTransaction;
+
+/** Signature hash types/flags */
+enum
+{
+    SIGHASH_ALL = 1,
+    SIGHASH_NONE = 2,
+    SIGHASH_SINGLE = 3,
+    SIGHASH_ANYONECANPAY = 0x80,
+};
+
+/** Script verification flags */
+enum
+{
+    SCRIPT_VERIFY_NONE      = 0,
+    SCRIPT_VERIFY_P2SH      = (1U << 0), // evaluate P2SH (BIP16) subscripts
+    SCRIPT_VERIFY_STRICTENC = (1U << 1), // enforce strict conformance to DER and SEC2 for signatures and pubkeys
+    SCRIPT_VERIFY_LOW_S     = (1U << 2), // enforce low S values (<n/2) in signatures (depends on STRICTENC)
+    SCRIPT_VERIFY_NOCACHE   = (1U << 3), // do not store results in signature cache (but do query it)
+    SCRIPT_VERIFY_NULLDUMMY = (1U << 4), // verify dummy stack item consumed by CHECKMULTISIG is of zero-length
+};
+
+bool IsCanonicalPubKey(const std::vector<unsigned char> &vchPubKey, unsigned int flags);
+bool IsCanonicalSignature(const std::vector<unsigned char> &vchSig, unsigned int flags);
+
+uint256 SignatureHash(const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType);
+bool CheckSig(std::vector<unsigned char> vchSig, const std::vector<unsigned char> &vchPubKey, const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, int flags);
+bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, unsigned int flags, int nHashType);
+bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CTransaction& txTo, unsigned int nIn, unsigned int flags, int nHashType);
+
+#endif
diff --git a/src/script/script.cpp b/src/script/script.cpp
new file mode 100644
index 000000000..60d1beac9
--- /dev/null
+++ b/src/script/script.cpp
@@ -0,0 +1,295 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2013 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 "script.h"
+
+#include <boost/foreach.hpp>
+
+using namespace std;
+
+const char* GetOpName(opcodetype opcode)
+{
+    switch (opcode)
+    {
+    // push value
+    case OP_0                      : return "0";
+    case OP_PUSHDATA1              : return "OP_PUSHDATA1";
+    case OP_PUSHDATA2              : return "OP_PUSHDATA2";
+    case OP_PUSHDATA4              : return "OP_PUSHDATA4";
+    case OP_1NEGATE                : return "-1";
+    case OP_RESERVED               : return "OP_RESERVED";
+    case OP_1                      : return "1";
+    case OP_2                      : return "2";
+    case OP_3                      : return "3";
+    case OP_4                      : return "4";
+    case OP_5                      : return "5";
+    case OP_6                      : return "6";
+    case OP_7                      : return "7";
+    case OP_8                      : return "8";
+    case OP_9                      : return "9";
+    case OP_10                     : return "10";
+    case OP_11                     : return "11";
+    case OP_12                     : return "12";
+    case OP_13                     : return "13";
+    case OP_14                     : return "14";
+    case OP_15                     : return "15";
+    case OP_16                     : return "16";
+
+    // control
+    case OP_NOP                    : return "OP_NOP";
+    case OP_VER                    : return "OP_VER";
+    case OP_IF                     : return "OP_IF";
+    case OP_NOTIF                  : return "OP_NOTIF";
+    case OP_VERIF                  : return "OP_VERIF";
+    case OP_VERNOTIF               : return "OP_VERNOTIF";
+    case OP_ELSE                   : return "OP_ELSE";
+    case OP_ENDIF                  : return "OP_ENDIF";
+    case OP_VERIFY                 : return "OP_VERIFY";
+    case OP_RETURN                 : return "OP_RETURN";
+
+    // stack ops
+    case OP_TOALTSTACK             : return "OP_TOALTSTACK";
+    case OP_FROMALTSTACK           : return "OP_FROMALTSTACK";
+    case OP_2DROP                  : return "OP_2DROP";
+    case OP_2DUP                   : return "OP_2DUP";
+    case OP_3DUP                   : return "OP_3DUP";
+    case OP_2OVER                  : return "OP_2OVER";
+    case OP_2ROT                   : return "OP_2ROT";
+    case OP_2SWAP                  : return "OP_2SWAP";
+    case OP_IFDUP                  : return "OP_IFDUP";
+    case OP_DEPTH                  : return "OP_DEPTH";
+    case OP_DROP                   : return "OP_DROP";
+    case OP_DUP                    : return "OP_DUP";
+    case OP_NIP                    : return "OP_NIP";
+    case OP_OVER                   : return "OP_OVER";
+    case OP_PICK                   : return "OP_PICK";
+    case OP_ROLL                   : return "OP_ROLL";
+    case OP_ROT                    : return "OP_ROT";
+    case OP_SWAP                   : return "OP_SWAP";
+    case OP_TUCK                   : return "OP_TUCK";
+
+    // splice ops
+    case OP_CAT                    : return "OP_CAT";
+    case OP_SUBSTR                 : return "OP_SUBSTR";
+    case OP_LEFT                   : return "OP_LEFT";
+    case OP_RIGHT                  : return "OP_RIGHT";
+    case OP_SIZE                   : return "OP_SIZE";
+
+    // bit logic
+    case OP_INVERT                 : return "OP_INVERT";
+    case OP_AND                    : return "OP_AND";
+    case OP_OR                     : return "OP_OR";
+    case OP_XOR                    : return "OP_XOR";
+    case OP_EQUAL                  : return "OP_EQUAL";
+    case OP_EQUALVERIFY            : return "OP_EQUALVERIFY";
+    case OP_RESERVED1              : return "OP_RESERVED1";
+    case OP_RESERVED2              : return "OP_RESERVED2";
+
+    // numeric
+    case OP_1ADD                   : return "OP_1ADD";
+    case OP_1SUB                   : return "OP_1SUB";
+    case OP_2MUL                   : return "OP_2MUL";
+    case OP_2DIV                   : return "OP_2DIV";
+    case OP_NEGATE                 : return "OP_NEGATE";
+    case OP_ABS                    : return "OP_ABS";
+    case OP_NOT                    : return "OP_NOT";
+    case OP_0NOTEQUAL              : return "OP_0NOTEQUAL";
+    case OP_ADD                    : return "OP_ADD";
+    case OP_SUB                    : return "OP_SUB";
+    case OP_MUL                    : return "OP_MUL";
+    case OP_DIV                    : return "OP_DIV";
+    case OP_MOD                    : return "OP_MOD";
+    case OP_LSHIFT                 : return "OP_LSHIFT";
+    case OP_RSHIFT                 : return "OP_RSHIFT";
+    case OP_BOOLAND                : return "OP_BOOLAND";
+    case OP_BOOLOR                 : return "OP_BOOLOR";
+    case OP_NUMEQUAL               : return "OP_NUMEQUAL";
+    case OP_NUMEQUALVERIFY         : return "OP_NUMEQUALVERIFY";
+    case OP_NUMNOTEQUAL            : return "OP_NUMNOTEQUAL";
+    case OP_LESSTHAN               : return "OP_LESSTHAN";
+    case OP_GREATERTHAN            : return "OP_GREATERTHAN";
+    case OP_LESSTHANOREQUAL        : return "OP_LESSTHANOREQUAL";
+    case OP_GREATERTHANOREQUAL     : return "OP_GREATERTHANOREQUAL";
+    case OP_MIN                    : return "OP_MIN";
+    case OP_MAX                    : return "OP_MAX";
+    case OP_WITHIN                 : return "OP_WITHIN";
+
+    // crypto
+    case OP_RIPEMD160              : return "OP_RIPEMD160";
+    case OP_SHA1                   : return "OP_SHA1";
+    case OP_SHA256                 : return "OP_SHA256";
+    case OP_HASH160                : return "OP_HASH160";
+    case OP_HASH256                : return "OP_HASH256";
+    case OP_CODESEPARATOR          : return "OP_CODESEPARATOR";
+    case OP_CHECKSIG               : return "OP_CHECKSIG";
+    case OP_CHECKSIGVERIFY         : return "OP_CHECKSIGVERIFY";
+    case OP_CHECKMULTISIG          : return "OP_CHECKMULTISIG";
+    case OP_CHECKMULTISIGVERIFY    : return "OP_CHECKMULTISIGVERIFY";
+
+    // expanson
+    case OP_NOP1                   : return "OP_NOP1";
+    case OP_NOP2                   : return "OP_NOP2";
+    case OP_NOP3                   : return "OP_NOP3";
+    case OP_NOP4                   : return "OP_NOP4";
+    case OP_NOP5                   : return "OP_NOP5";
+    case OP_NOP6                   : return "OP_NOP6";
+    case OP_NOP7                   : return "OP_NOP7";
+    case OP_NOP8                   : return "OP_NOP8";
+    case OP_NOP9                   : return "OP_NOP9";
+    case OP_NOP10                  : return "OP_NOP10";
+
+    case OP_INVALIDOPCODE          : return "OP_INVALIDOPCODE";
+
+    // Note:
+    //  The template matching params OP_SMALLDATA/etc are defined in opcodetype enum
+    //  as kind of implementation hack, they are *NOT* real opcodes.  If found in real
+    //  Script, just let the default: case deal with them.
+
+    default:
+        return "OP_UNKNOWN";
+    }
+}
+
+unsigned int CScript::GetSigOpCount(bool fAccurate) const
+{
+    unsigned int n = 0;
+    const_iterator pc = begin();
+    opcodetype lastOpcode = OP_INVALIDOPCODE;
+    while (pc < end())
+    {
+        opcodetype opcode;
+        if (!GetOp(pc, opcode))
+            break;
+        if (opcode == OP_CHECKSIG || opcode == OP_CHECKSIGVERIFY)
+            n++;
+        else if (opcode == OP_CHECKMULTISIG || opcode == OP_CHECKMULTISIGVERIFY)
+        {
+            if (fAccurate && lastOpcode >= OP_1 && lastOpcode <= OP_16)
+                n += DecodeOP_N(lastOpcode);
+            else
+                n += 20;
+        }
+        lastOpcode = opcode;
+    }
+    return n;
+}
+
+unsigned int CScript::GetSigOpCount(const CScript& scriptSig) const
+{
+    if (!IsPayToScriptHash())
+        return GetSigOpCount(true);
+
+    // This is a pay-to-script-hash scriptPubKey;
+    // get the last item that the scriptSig
+    // pushes onto the stack:
+    const_iterator pc = scriptSig.begin();
+    vector<unsigned char> data;
+    while (pc < scriptSig.end())
+    {
+        opcodetype opcode;
+        if (!scriptSig.GetOp(pc, opcode, data))
+            return 0;
+        if (opcode > OP_16)
+            return 0;
+    }
+
+    /// ... and return its opcount:
+    CScript subscript(data.begin(), data.end());
+    return subscript.GetSigOpCount(true);
+}
+
+bool CScript::IsPayToScriptHash() const
+{
+    // Extra-fast test for pay-to-script-hash CScripts:
+    return (this->size() == 23 &&
+            this->at(0) == OP_HASH160 &&
+            this->at(1) == 0x14 &&
+            this->at(22) == OP_EQUAL);
+}
+
+bool CScript::IsPushOnly() const
+{
+    const_iterator pc = begin();
+    while (pc < end())
+    {
+        opcodetype opcode;
+        if (!GetOp(pc, opcode))
+            return false;
+        // Note that IsPushOnly() *does* consider OP_RESERVED to be a
+        // push-type opcode, however execution of OP_RESERVED fails, so
+        // it's not relevant to P2SH as the scriptSig would fail prior to
+        // the P2SH special validation code being executed.
+        if (opcode > OP_16)
+            return false;
+    }
+    return true;
+}
+
+bool CScript::HasCanonicalPushes() const
+{
+    const_iterator pc = begin();
+    while (pc < end())
+    {
+        opcodetype opcode;
+        std::vector<unsigned char> data;
+        if (!GetOp(pc, opcode, data))
+            return false;
+        if (opcode > OP_16)
+            continue;
+        if (opcode < OP_PUSHDATA1 && opcode > OP_0 && (data.size() == 1 && data[0] <= 16))
+            // Could have used an OP_n code, rather than a 1-byte push.
+            return false;
+        if (opcode == OP_PUSHDATA1 && data.size() < OP_PUSHDATA1)
+            // Could have used a normal n-byte push, rather than OP_PUSHDATA1.
+            return false;
+        if (opcode == OP_PUSHDATA2 && data.size() <= 0xFF)
+            // Could have used an OP_PUSHDATA1.
+            return false;
+        if (opcode == OP_PUSHDATA4 && data.size() <= 0xFFFF)
+            // Could have used an OP_PUSHDATA2.
+            return false;
+    }
+    return true;
+}
+
+class CScriptVisitor : public boost::static_visitor<bool>
+{
+private:
+    CScript *script;
+public:
+    CScriptVisitor(CScript *scriptin) { script = scriptin; }
+
+    bool operator()(const CNoDestination &dest) const {
+        script->clear();
+        return false;
+    }
+
+    bool operator()(const CKeyID &keyID) const {
+        script->clear();
+        *script << OP_DUP << OP_HASH160 << keyID << OP_EQUALVERIFY << OP_CHECKSIG;
+        return true;
+    }
+
+    bool operator()(const CScriptID &scriptID) const {
+        script->clear();
+        *script << OP_HASH160 << scriptID << OP_EQUAL;
+        return true;
+    }
+};
+
+void CScript::SetDestination(const CTxDestination& dest)
+{
+    boost::apply_visitor(CScriptVisitor(this), dest);
+}
+
+void CScript::SetMultisig(int nRequired, const std::vector<CPubKey>& keys)
+{
+    this->clear();
+
+    *this << EncodeOP_N(nRequired);
+    BOOST_FOREACH(const CPubKey& key, keys)
+        *this << key;
+    *this << EncodeOP_N(keys.size()) << OP_CHECKMULTISIG;
+}
diff --git a/src/script.h b/src/script/script.h
similarity index 71%
rename from src/script.h
rename to src/script/script.h
index d17cfe3fa..21847c09b 100644
--- a/src/script.h
+++ b/src/script/script.h
@@ -7,22 +7,162 @@
 #define H_BITCOIN_SCRIPT
 
 #include "key.h"
-#include "utilstrencodings.h"
 #include "tinyformat.h"
+#include "utilstrencodings.h"
 
 #include <stdexcept>
-#include <stdint.h>
-#include <string>
-#include <vector>
 
 #include <boost/variant.hpp>
 
-class CKeyStore;
-class CTransaction;
-struct CMutableTransaction;
-
 static const unsigned int MAX_SCRIPT_ELEMENT_SIZE = 520; // bytes
-static const unsigned int MAX_OP_RETURN_RELAY = 40;      // bytes
+
+/** Script opcodes */
+enum opcodetype
+{
+    // push value
+    OP_0 = 0x00,
+    OP_FALSE = OP_0,
+    OP_PUSHDATA1 = 0x4c,
+    OP_PUSHDATA2 = 0x4d,
+    OP_PUSHDATA4 = 0x4e,
+    OP_1NEGATE = 0x4f,
+    OP_RESERVED = 0x50,
+    OP_1 = 0x51,
+    OP_TRUE=OP_1,
+    OP_2 = 0x52,
+    OP_3 = 0x53,
+    OP_4 = 0x54,
+    OP_5 = 0x55,
+    OP_6 = 0x56,
+    OP_7 = 0x57,
+    OP_8 = 0x58,
+    OP_9 = 0x59,
+    OP_10 = 0x5a,
+    OP_11 = 0x5b,
+    OP_12 = 0x5c,
+    OP_13 = 0x5d,
+    OP_14 = 0x5e,
+    OP_15 = 0x5f,
+    OP_16 = 0x60,
+
+    // control
+    OP_NOP = 0x61,
+    OP_VER = 0x62,
+    OP_IF = 0x63,
+    OP_NOTIF = 0x64,
+    OP_VERIF = 0x65,
+    OP_VERNOTIF = 0x66,
+    OP_ELSE = 0x67,
+    OP_ENDIF = 0x68,
+    OP_VERIFY = 0x69,
+    OP_RETURN = 0x6a,
+
+    // stack ops
+    OP_TOALTSTACK = 0x6b,
+    OP_FROMALTSTACK = 0x6c,
+    OP_2DROP = 0x6d,
+    OP_2DUP = 0x6e,
+    OP_3DUP = 0x6f,
+    OP_2OVER = 0x70,
+    OP_2ROT = 0x71,
+    OP_2SWAP = 0x72,
+    OP_IFDUP = 0x73,
+    OP_DEPTH = 0x74,
+    OP_DROP = 0x75,
+    OP_DUP = 0x76,
+    OP_NIP = 0x77,
+    OP_OVER = 0x78,
+    OP_PICK = 0x79,
+    OP_ROLL = 0x7a,
+    OP_ROT = 0x7b,
+    OP_SWAP = 0x7c,
+    OP_TUCK = 0x7d,
+
+    // splice ops
+    OP_CAT = 0x7e,
+    OP_SUBSTR = 0x7f,
+    OP_LEFT = 0x80,
+    OP_RIGHT = 0x81,
+    OP_SIZE = 0x82,
+
+    // bit logic
+    OP_INVERT = 0x83,
+    OP_AND = 0x84,
+    OP_OR = 0x85,
+    OP_XOR = 0x86,
+    OP_EQUAL = 0x87,
+    OP_EQUALVERIFY = 0x88,
+    OP_RESERVED1 = 0x89,
+    OP_RESERVED2 = 0x8a,
+
+    // numeric
+    OP_1ADD = 0x8b,
+    OP_1SUB = 0x8c,
+    OP_2MUL = 0x8d,
+    OP_2DIV = 0x8e,
+    OP_NEGATE = 0x8f,
+    OP_ABS = 0x90,
+    OP_NOT = 0x91,
+    OP_0NOTEQUAL = 0x92,
+
+    OP_ADD = 0x93,
+    OP_SUB = 0x94,
+    OP_MUL = 0x95,
+    OP_DIV = 0x96,
+    OP_MOD = 0x97,
+    OP_LSHIFT = 0x98,
+    OP_RSHIFT = 0x99,
+
+    OP_BOOLAND = 0x9a,
+    OP_BOOLOR = 0x9b,
+    OP_NUMEQUAL = 0x9c,
+    OP_NUMEQUALVERIFY = 0x9d,
+    OP_NUMNOTEQUAL = 0x9e,
+    OP_LESSTHAN = 0x9f,
+    OP_GREATERTHAN = 0xa0,
+    OP_LESSTHANOREQUAL = 0xa1,
+    OP_GREATERTHANOREQUAL = 0xa2,
+    OP_MIN = 0xa3,
+    OP_MAX = 0xa4,
+
+    OP_WITHIN = 0xa5,
+
+    // crypto
+    OP_RIPEMD160 = 0xa6,
+    OP_SHA1 = 0xa7,
+    OP_SHA256 = 0xa8,
+    OP_HASH160 = 0xa9,
+    OP_HASH256 = 0xaa,
+    OP_CODESEPARATOR = 0xab,
+    OP_CHECKSIG = 0xac,
+    OP_CHECKSIGVERIFY = 0xad,
+    OP_CHECKMULTISIG = 0xae,
+    OP_CHECKMULTISIGVERIFY = 0xaf,
+
+    // expansion
+    OP_NOP1 = 0xb0,
+    OP_NOP2 = 0xb1,
+    OP_NOP3 = 0xb2,
+    OP_NOP4 = 0xb3,
+    OP_NOP5 = 0xb4,
+    OP_NOP6 = 0xb5,
+    OP_NOP7 = 0xb6,
+    OP_NOP8 = 0xb7,
+    OP_NOP9 = 0xb8,
+    OP_NOP10 = 0xb9,
+
+
+    // template matching params
+    OP_SMALLDATA = 0xf9,
+    OP_SMALLINTEGER = 0xfa,
+    OP_PUBKEYS = 0xfb,
+    OP_PUBKEYHASH = 0xfd,
+    OP_PUBKEY = 0xfe,
+
+    OP_INVALIDOPCODE = 0xff,
+};
+
+const char* GetOpName(opcodetype opcode);
 
 class scriptnum_error : public std::runtime_error
 {
@@ -131,7 +271,6 @@ public:
             absvalue >>= 8;
         }
 
-
 //    - If the most significant byte is >= 0x80 and the value is positive, push a
 //    new zero-byte to make the significant byte < 0x80 again.
 
@@ -173,66 +312,13 @@ private:
     int64_t m_value;
 };
 
-/** Signature hash types/flags */
-enum
-{
-    SIGHASH_ALL = 1,
-    SIGHASH_NONE = 2,
-    SIGHASH_SINGLE = 3,
-    SIGHASH_ANYONECANPAY = 0x80,
-};
-
-/** Script verification flags */
-enum
-{
-    SCRIPT_VERIFY_NONE      = 0,
-    SCRIPT_VERIFY_P2SH      = (1U << 0), // evaluate P2SH (BIP16) subscripts
-    SCRIPT_VERIFY_STRICTENC = (1U << 1), // enforce strict conformance to DER and SEC2 for signatures and pubkeys
-    SCRIPT_VERIFY_LOW_S     = (1U << 2), // enforce low S values (<n/2) in signatures (depends on STRICTENC)
-    SCRIPT_VERIFY_NOCACHE   = (1U << 3), // do not store results in signature cache (but do query it)
-    SCRIPT_VERIFY_NULLDUMMY = (1U << 4), // verify dummy stack item consumed by CHECKMULTISIG is of zero-length
-};
-
-/** IsMine() return codes */
-enum isminetype
-{
-    ISMINE_NO = 0,
-    ISMINE_WATCH_ONLY = 1,
-    ISMINE_SPENDABLE = 2,
-    ISMINE_ALL = ISMINE_WATCH_ONLY | ISMINE_SPENDABLE
-};
-/** used for bitflags of isminetype */
-typedef uint8_t isminefilter;
-
-// Mandatory script verification flags that all new blocks must comply with for
-// them to be valid. (but old blocks may not comply with) Currently just P2SH,
-// but in the future other flags may be added, such as a soft-fork to enforce
-// strict DER encoding.
-//
-// Failing one of these tests may trigger a DoS ban - see CheckInputs() for
-// details.
-static const unsigned int MANDATORY_SCRIPT_VERIFY_FLAGS = SCRIPT_VERIFY_P2SH;
-
-// Standard script verification flags that standard transactions will comply
-// with. However scripts violating these flags may still be present in valid
-// blocks and we must accept those blocks.
-static const unsigned int STANDARD_SCRIPT_VERIFY_FLAGS = MANDATORY_SCRIPT_VERIFY_FLAGS |
-                                                         SCRIPT_VERIFY_STRICTENC |
-                                                         SCRIPT_VERIFY_NULLDUMMY;
-
-// For convenience, standard but not mandatory verify flags.
-static const unsigned int STANDARD_NOT_MANDATORY_VERIFY_FLAGS = STANDARD_SCRIPT_VERIFY_FLAGS & ~MANDATORY_SCRIPT_VERIFY_FLAGS;
-
-enum txnouttype
+inline std::string ValueString(const std::vector<unsigned char>& vch)
 {
-    TX_NONSTANDARD,
-    // 'standard' transaction types:
-    TX_PUBKEY,
-    TX_PUBKEYHASH,
-    TX_SCRIPTHASH,
-    TX_MULTISIG,
-    TX_NULL_DATA,
-};
+    if (vch.size() <= 4)
+        return strprintf("%d", CScriptNum(vch).getint());
+    else
+        return HexStr(vch);
+}
 
 class CNoDestination {
 public:
@@ -248,167 +334,6 @@ public:
  */
 typedef boost::variant<CNoDestination, CKeyID, CScriptID> CTxDestination;
 
-const char* GetTxnOutputType(txnouttype t);
-
-/** Script opcodes */
-enum opcodetype
-{
-    // push value
-    OP_0 = 0x00,
-    OP_FALSE = OP_0,
-    OP_PUSHDATA1 = 0x4c,
-    OP_PUSHDATA2 = 0x4d,
-    OP_PUSHDATA4 = 0x4e,
-    OP_1NEGATE = 0x4f,
-    OP_RESERVED = 0x50,
-    OP_1 = 0x51,
-    OP_TRUE=OP_1,
-    OP_2 = 0x52,
-    OP_3 = 0x53,
-    OP_4 = 0x54,
-    OP_5 = 0x55,
-    OP_6 = 0x56,
-    OP_7 = 0x57,
-    OP_8 = 0x58,
-    OP_9 = 0x59,
-    OP_10 = 0x5a,
-    OP_11 = 0x5b,
-    OP_12 = 0x5c,
-    OP_13 = 0x5d,
-    OP_14 = 0x5e,
-    OP_15 = 0x5f,
-    OP_16 = 0x60,
-
-    // control
-    OP_NOP = 0x61,
-    OP_VER = 0x62,
-    OP_IF = 0x63,
-    OP_NOTIF = 0x64,
-    OP_VERIF = 0x65,
-    OP_VERNOTIF = 0x66,
-    OP_ELSE = 0x67,
-    OP_ENDIF = 0x68,
-    OP_VERIFY = 0x69,
-    OP_RETURN = 0x6a,
-
-    // stack ops
-    OP_TOALTSTACK = 0x6b,
-    OP_FROMALTSTACK = 0x6c,
-    OP_2DROP = 0x6d,
-    OP_2DUP = 0x6e,
-    OP_3DUP = 0x6f,
-    OP_2OVER = 0x70,
-    OP_2ROT = 0x71,
-    OP_2SWAP = 0x72,
-    OP_IFDUP = 0x73,
-    OP_DEPTH = 0x74,
-    OP_DROP = 0x75,
-    OP_DUP = 0x76,
-    OP_NIP = 0x77,
-    OP_OVER = 0x78,
-    OP_PICK = 0x79,
-    OP_ROLL = 0x7a,
-    OP_ROT = 0x7b,
-    OP_SWAP = 0x7c,
-    OP_TUCK = 0x7d,
-
-    // splice ops
-    OP_CAT = 0x7e,
-    OP_SUBSTR = 0x7f,
-    OP_LEFT = 0x80,
-    OP_RIGHT = 0x81,
-    OP_SIZE = 0x82,
-
-    // bit logic
-    OP_INVERT = 0x83,
-    OP_AND = 0x84,
-    OP_OR = 0x85,
-    OP_XOR = 0x86,
-    OP_EQUAL = 0x87,
-    OP_EQUALVERIFY = 0x88,
-    OP_RESERVED1 = 0x89,
-    OP_RESERVED2 = 0x8a,
-
-    // numeric
-    OP_1ADD = 0x8b,
-    OP_1SUB = 0x8c,
-    OP_2MUL = 0x8d,
-    OP_2DIV = 0x8e,
-    OP_NEGATE = 0x8f,
-    OP_ABS = 0x90,
-    OP_NOT = 0x91,
-    OP_0NOTEQUAL = 0x92,
-
-    OP_ADD = 0x93,
-    OP_SUB = 0x94,
-    OP_MUL = 0x95,
-    OP_DIV = 0x96,
-    OP_MOD = 0x97,
-    OP_LSHIFT = 0x98,
-    OP_RSHIFT = 0x99,
-
-    OP_BOOLAND = 0x9a,
-    OP_BOOLOR = 0x9b,
-    OP_NUMEQUAL = 0x9c,
-    OP_NUMEQUALVERIFY = 0x9d,
-    OP_NUMNOTEQUAL = 0x9e,
-    OP_LESSTHAN = 0x9f,
-    OP_GREATERTHAN = 0xa0,
-    OP_LESSTHANOREQUAL = 0xa1,
-    OP_GREATERTHANOREQUAL = 0xa2,
-    OP_MIN = 0xa3,
-    OP_MAX = 0xa4,
-
-    OP_WITHIN = 0xa5,
-
-    // crypto
-    OP_RIPEMD160 = 0xa6,
-    OP_SHA1 = 0xa7,
-    OP_SHA256 = 0xa8,
-    OP_HASH160 = 0xa9,
-    OP_HASH256 = 0xaa,
-    OP_CODESEPARATOR = 0xab,
-    OP_CHECKSIG = 0xac,
-    OP_CHECKSIGVERIFY = 0xad,
-    OP_CHECKMULTISIG = 0xae,
-    OP_CHECKMULTISIGVERIFY = 0xaf,
-
-    // expansion
-    OP_NOP1 = 0xb0,
-    OP_NOP2 = 0xb1,
-    OP_NOP3 = 0xb2,
-    OP_NOP4 = 0xb3,
-    OP_NOP5 = 0xb4,
-    OP_NOP6 = 0xb5,
-    OP_NOP7 = 0xb6,
-    OP_NOP8 = 0xb7,
-    OP_NOP9 = 0xb8,
-    OP_NOP10 = 0xb9,
-
-
-
-    // template matching params
-    OP_SMALLDATA = 0xf9,
-    OP_SMALLINTEGER = 0xfa,
-    OP_PUBKEYS = 0xfb,
-    OP_PUBKEYHASH = 0xfd,
-    OP_PUBKEY = 0xfe,
-
-    OP_INVALIDOPCODE = 0xff,
-};
-
-const char* GetOpName(opcodetype opcode);
-
-
-
-inline std::string ValueString(const std::vector<unsigned char>& vch)
-{
-    if (vch.size() <= 4)
-        return strprintf("%d", CScriptNum(vch).getint());
-    else
-        return HexStr(vch);
-}
-
 /** Serialized script, used inside transaction inputs and outputs */
 class CScript : public std::vector<unsigned char>
 {
@@ -446,7 +371,6 @@ public:
         return ret;
     }
 
-
     CScript(int64_t b)        { operator<<(b); }
 
     explicit CScript(opcodetype b)     { operator<<(b); }
@@ -718,98 +642,4 @@ public:
     }
 };
 
-/** Compact serializer for scripts.
- *
- *  It detects common cases and encodes them much more efficiently.
- *  3 special cases are defined:
- *  * Pay to pubkey hash (encoded as 21 bytes)
- *  * Pay to script hash (encoded as 21 bytes)
- *  * Pay to pubkey starting with 0x02, 0x03 or 0x04 (encoded as 33 bytes)
- *
- *  Other scripts up to 121 bytes require 1 byte + script length. Above
- *  that, scripts up to 16505 bytes require 2 bytes + script length.
- */
-class CScriptCompressor
-{
-private:
-    // make this static for now (there are only 6 special scripts defined)
-    // this can potentially be extended together with a new nVersion for
-    // transactions, in which case this value becomes dependent on nVersion
-    // and nHeight of the enclosing transaction.
-    static const unsigned int nSpecialScripts = 6;
-
-    CScript &script;
-protected:
-    // These check for scripts for which a special case with a shorter encoding is defined.
-    // They are implemented separately from the CScript test, as these test for exact byte
-    // sequence correspondences, and are more strict. For example, IsToPubKey also verifies
-    // whether the public key is valid (as invalid ones cannot be represented in compressed
-    // form).
-    bool IsToKeyID(CKeyID &hash) const;
-    bool IsToScriptID(CScriptID &hash) const;
-    bool IsToPubKey(CPubKey &pubkey) const;
-
-    bool Compress(std::vector<unsigned char> &out) const;
-    unsigned int GetSpecialSize(unsigned int nSize) const;
-    bool Decompress(unsigned int nSize, const std::vector<unsigned char> &out);
-public:
-    CScriptCompressor(CScript &scriptIn) : script(scriptIn) { }
-
-    unsigned int GetSerializeSize(int nType, int nVersion) const {
-        std::vector<unsigned char> compr;
-        if (Compress(compr))
-            return compr.size();
-        unsigned int nSize = script.size() + nSpecialScripts;
-        return script.size() + VARINT(nSize).GetSerializeSize(nType, nVersion);
-    }
-
-    template<typename Stream>
-    void Serialize(Stream &s, int nType, int nVersion) const {
-        std::vector<unsigned char> compr;
-        if (Compress(compr)) {
-            s << CFlatData(compr);
-            return;
-        }
-        unsigned int nSize = script.size() + nSpecialScripts;
-        s << VARINT(nSize);
-        s << CFlatData(script);
-    }
-
-    template<typename Stream>
-    void Unserialize(Stream &s, int nType, int nVersion) {
-        unsigned int nSize = 0;
-        s >> VARINT(nSize);
-        if (nSize < nSpecialScripts) {
-            std::vector<unsigned char> vch(GetSpecialSize(nSize), 0x00);
-            s >> REF(CFlatData(vch));
-            Decompress(nSize, vch);
-            return;
-        }
-        nSize -= nSpecialScripts;
-        script.resize(nSize);
-        s >> REF(CFlatData(script));
-    }
-};
-
-bool IsCanonicalPubKey(const std::vector<unsigned char> &vchPubKey, unsigned int flags);
-bool IsCanonicalSignature(const std::vector<unsigned char> &vchSig, unsigned int flags);
-
-bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, unsigned int flags, int nHashType);
-uint256 SignatureHash(const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType);
-bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<std::vector<unsigned char> >& vSolutionsRet);
-int ScriptSigArgsExpected(txnouttype t, const std::vector<std::vector<unsigned char> >& vSolutions);
-bool IsStandard(const CScript& scriptPubKey, txnouttype& whichType);
-isminetype IsMine(const CKeyStore& keystore, const CScript& scriptPubKey);
-isminetype IsMine(const CKeyStore& keystore, const CTxDestination& dest);
-void ExtractAffectedKeys(const CKeyStore &keystore, const CScript& scriptPubKey, std::vector<CKeyID> &vKeys);
-bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet);
-bool ExtractDestinations(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<CTxDestination>& addressRet, int& nRequiredRet);
-bool SignSignature(const CKeyStore& keystore, const CScript& fromPubKey, CMutableTransaction& txTo, unsigned int nIn, int nHashType=SIGHASH_ALL);
-bool SignSignature(const CKeyStore& keystore, const CTransaction& txFrom, CMutableTransaction& txTo, unsigned int nIn, int nHashType=SIGHASH_ALL);
-bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CTransaction& txTo, unsigned int nIn, unsigned int flags, 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 // H_BITCOIN_SCRIPT
+#endif
diff --git a/src/script/sign.cpp b/src/script/sign.cpp
new file mode 100644
index 000000000..958177de3
--- /dev/null
+++ b/src/script/sign.cpp
@@ -0,0 +1,260 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2013 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 "script/sign.h"
+
+#include "core.h"
+#include "key.h"
+#include "keystore.h"
+#include "script/standard.h"
+#include "uint256.h"
+
+#include <boost/foreach.hpp>
+
+using namespace std;
+
+typedef vector<unsigned char> valtype;
+
+bool Sign1(const CKeyID& address, const CKeyStore& keystore, uint256 hash, int nHashType, CScript& scriptSigRet)
+{
+    CKey key;
+    if (!keystore.GetKey(address, key))
+        return false;
+
+    vector<unsigned char> vchSig;
+    if (!key.Sign(hash, vchSig))
+        return false;
+    vchSig.push_back((unsigned char)nHashType);
+    scriptSigRet << vchSig;
+
+    return true;
+}
+
+bool SignN(const vector<valtype>& multisigdata, const CKeyStore& keystore, uint256 hash, int nHashType, CScript& scriptSigRet)
+{
+    int nSigned = 0;
+    int nRequired = multisigdata.front()[0];
+    for (unsigned int i = 1; i < multisigdata.size()-1 && nSigned < nRequired; i++)
+    {
+        const valtype& pubkey = multisigdata[i];
+        CKeyID keyID = CPubKey(pubkey).GetID();
+        if (Sign1(keyID, keystore, hash, nHashType, scriptSigRet))
+            ++nSigned;
+    }
+    return nSigned==nRequired;
+}
+
+//
+// Sign scriptPubKey with private keys stored in keystore, given transaction hash and hash type.
+// Signatures are returned in scriptSigRet (or returns false if scriptPubKey can't be signed),
+// unless whichTypeRet is TX_SCRIPTHASH, in which case scriptSigRet is the redemption script.
+// Returns false if scriptPubKey could not be completely satisfied.
+//
+bool Solver(const CKeyStore& keystore, const CScript& scriptPubKey, uint256 hash, int nHashType,
+                  CScript& scriptSigRet, txnouttype& whichTypeRet)
+{
+    scriptSigRet.clear();
+
+    vector<valtype> vSolutions;
+    if (!Solver(scriptPubKey, whichTypeRet, vSolutions))
+        return false;
+
+    CKeyID keyID;
+    switch (whichTypeRet)
+    {
+    case TX_NONSTANDARD:
+    case TX_NULL_DATA:
+        return false;
+    case TX_PUBKEY:
+        keyID = CPubKey(vSolutions[0]).GetID();
+        return Sign1(keyID, keystore, hash, nHashType, scriptSigRet);
+    case TX_PUBKEYHASH:
+        keyID = CKeyID(uint160(vSolutions[0]));
+        if (!Sign1(keyID, keystore, hash, nHashType, scriptSigRet))
+            return false;
+        else
+        {
+            CPubKey vch;
+            keystore.GetPubKey(keyID, vch);
+            scriptSigRet << vch;
+        }
+        return true;
+    case TX_SCRIPTHASH:
+        return keystore.GetCScript(uint160(vSolutions[0]), scriptSigRet);
+
+    case TX_MULTISIG:
+        scriptSigRet << OP_0; // workaround CHECKMULTISIG bug
+        return (SignN(vSolutions, keystore, hash, nHashType, scriptSigRet));
+    }
+    return false;
+}
+
+bool SignSignature(const CKeyStore &keystore, const CScript& fromPubKey, CMutableTransaction& txTo, unsigned int nIn, int nHashType)
+{
+    assert(nIn < txTo.vin.size());
+    CTxIn& txin = txTo.vin[nIn];
+
+    // Leave out the signature from the hash, since a signature can't sign itself.
+    // The checksig op will also drop the signatures from its hash.
+    uint256 hash = SignatureHash(fromPubKey, txTo, nIn, nHashType);
+
+    txnouttype whichType;
+    if (!Solver(keystore, fromPubKey, hash, nHashType, txin.scriptSig, whichType))
+        return false;
+
+    if (whichType == TX_SCRIPTHASH)
+    {
+        // Solver returns the subscript that need to be evaluated;
+        // the final scriptSig is the signatures from that
+        // and then the serialized subscript:
+        CScript subscript = txin.scriptSig;
+
+        // Recompute txn hash using subscript in place of scriptPubKey:
+        uint256 hash2 = SignatureHash(subscript, txTo, nIn, nHashType);
+
+        txnouttype subType;
+        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
+    return VerifyScript(txin.scriptSig, fromPubKey, txTo, nIn, STANDARD_SCRIPT_VERIFY_FLAGS, 0);
+}
+
+bool SignSignature(const CKeyStore &keystore, const CTransaction& txFrom, CMutableTransaction& txTo, unsigned int nIn, int nHashType)
+{
+    assert(nIn < txTo.vin.size());
+    CTxIn& txin = txTo.vin[nIn];
+    assert(txin.prevout.n < txFrom.vout.size());
+    const CTxOut& txout = txFrom.vout[txin.prevout.n];
+
+    return SignSignature(keystore, txout.scriptPubKey, txTo, nIn, 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 CMutableTransaction& 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:
+    assert(vSolutions.size() > 1);
+    unsigned int nSigsRequired = vSolutions.front()[0];
+    unsigned int nPubKeys = vSolutions.size()-2;
+    map<valtype, valtype> sigs;
+    BOOST_FOREACH(const valtype& sig, allsigs)
+    {
+        for (unsigned 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, 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 (unsigned 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 (unsigned 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:
+    case TX_NULL_DATA:
+        // 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
+        {
+            // Recur 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, SCRIPT_VERIFY_STRICTENC, 0);
+    vector<valtype> stack2;
+    EvalScript(stack2, scriptSig2, CTransaction(), 0, SCRIPT_VERIFY_STRICTENC, 0);
+
+    return CombineSignatures(scriptPubKey, txTo, nIn, txType, vSolutions, stack1, stack2);
+}
diff --git a/src/script/sign.h b/src/script/sign.h
new file mode 100644
index 000000000..51723b53a
--- /dev/null
+++ b/src/script/sign.h
@@ -0,0 +1,23 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2013 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef H_BITCOIN_SCRIPT_SIGN
+#define H_BITCOIN_SCRIPT_SIGN
+
+#include "script/interpreter.h"
+
+class CKeyStore;
+class CScript;
+class CTransaction;
+struct CMutableTransaction;
+
+bool SignSignature(const CKeyStore& keystore, const CScript& fromPubKey, CMutableTransaction& txTo, unsigned int nIn, int nHashType=SIGHASH_ALL);
+bool SignSignature(const CKeyStore& keystore, const CTransaction& txFrom, CMutableTransaction& txTo, unsigned int nIn, int nHashType=SIGHASH_ALL);
+
+// 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/script/standard.cpp b/src/script/standard.cpp
new file mode 100644
index 000000000..684edff4d
--- /dev/null
+++ b/src/script/standard.cpp
@@ -0,0 +1,254 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2013 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 "script/standard.h"
+
+#include "script/script.h"
+#include "util.h"
+
+#include <boost/foreach.hpp>
+
+using namespace std;
+
+typedef vector<unsigned char> valtype;
+
+const char* GetTxnOutputType(txnouttype t)
+{
+    switch (t)
+    {
+    case TX_NONSTANDARD: return "nonstandard";
+    case TX_PUBKEY: return "pubkey";
+    case TX_PUBKEYHASH: return "pubkeyhash";
+    case TX_SCRIPTHASH: return "scripthash";
+    case TX_MULTISIG: return "multisig";
+    case TX_NULL_DATA: return "nulldata";
+    }
+    return NULL;
+}
+
+//
+// Return public keys or hashes from scriptPubKey, for 'standard' transaction types.
+//
+bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, vector<vector<unsigned char> >& vSolutionsRet)
+{
+    // Templates
+    static multimap<txnouttype, CScript> mTemplates;
+    if (mTemplates.empty())
+    {
+        // Standard tx, sender provides pubkey, receiver adds signature
+        mTemplates.insert(make_pair(TX_PUBKEY, CScript() << OP_PUBKEY << OP_CHECKSIG));
+
+        // Bitcoin address tx, sender provides hash of pubkey, receiver provides signature and pubkey
+        mTemplates.insert(make_pair(TX_PUBKEYHASH, CScript() << OP_DUP << OP_HASH160 << OP_PUBKEYHASH << OP_EQUALVERIFY << OP_CHECKSIG));
+
+        // Sender provides N pubkeys, receivers provides M signatures
+        mTemplates.insert(make_pair(TX_MULTISIG, CScript() << OP_SMALLINTEGER << OP_PUBKEYS << OP_SMALLINTEGER << OP_CHECKMULTISIG));
+
+        // Empty, provably prunable, data-carrying output
+        if (GetBoolArg("-datacarrier", true))
+            mTemplates.insert(make_pair(TX_NULL_DATA, CScript() << OP_RETURN << OP_SMALLDATA));
+        mTemplates.insert(make_pair(TX_NULL_DATA, CScript() << OP_RETURN));
+    }
+
+    // Shortcut for pay-to-script-hash, which are more constrained than the other types:
+    // it is always OP_HASH160 20 [20 byte hash] OP_EQUAL
+    if (scriptPubKey.IsPayToScriptHash())
+    {
+        typeRet = TX_SCRIPTHASH;
+        vector<unsigned char> hashBytes(scriptPubKey.begin()+2, scriptPubKey.begin()+22);
+        vSolutionsRet.push_back(hashBytes);
+        return true;
+    }
+
+    // Scan templates
+    const CScript& script1 = scriptPubKey;
+    BOOST_FOREACH(const PAIRTYPE(txnouttype, CScript)& tplate, mTemplates)
+    {
+        const CScript& script2 = tplate.second;
+        vSolutionsRet.clear();
+
+        opcodetype opcode1, opcode2;
+        vector<unsigned char> vch1, vch2;
+
+        // Compare
+        CScript::const_iterator pc1 = script1.begin();
+        CScript::const_iterator pc2 = script2.begin();
+        while (true)
+        {
+            if (pc1 == script1.end() && pc2 == script2.end())
+            {
+                // Found a match
+                typeRet = tplate.first;
+                if (typeRet == TX_MULTISIG)
+                {
+                    // Additional checks for TX_MULTISIG:
+                    unsigned char m = vSolutionsRet.front()[0];
+                    unsigned char n = vSolutionsRet.back()[0];
+                    if (m < 1 || n < 1 || m > n || vSolutionsRet.size()-2 != n)
+                        return false;
+                }
+                return true;
+            }
+            if (!script1.GetOp(pc1, opcode1, vch1))
+                break;
+            if (!script2.GetOp(pc2, opcode2, vch2))
+                break;
+
+            // Template matching opcodes:
+            if (opcode2 == OP_PUBKEYS)
+            {
+                while (vch1.size() >= 33 && vch1.size() <= 65)
+                {
+                    vSolutionsRet.push_back(vch1);
+                    if (!script1.GetOp(pc1, opcode1, vch1))
+                        break;
+                }
+                if (!script2.GetOp(pc2, opcode2, vch2))
+                    break;
+                // Normal situation is to fall through
+                // to other if/else statements
+            }
+
+            if (opcode2 == OP_PUBKEY)
+            {
+                if (vch1.size() < 33 || vch1.size() > 65)
+                    break;
+                vSolutionsRet.push_back(vch1);
+            }
+            else if (opcode2 == OP_PUBKEYHASH)
+            {
+                if (vch1.size() != sizeof(uint160))
+                    break;
+                vSolutionsRet.push_back(vch1);
+            }
+            else if (opcode2 == OP_SMALLINTEGER)
+            {   // Single-byte small integer pushed onto vSolutions
+                if (opcode1 == OP_0 ||
+                    (opcode1 >= OP_1 && opcode1 <= OP_16))
+                {
+                    char n = (char)CScript::DecodeOP_N(opcode1);
+                    vSolutionsRet.push_back(valtype(1, n));
+                }
+                else
+                    break;
+            }
+            else if (opcode2 == OP_SMALLDATA)
+            {
+                // small pushdata, <= MAX_OP_RETURN_RELAY bytes
+                if (vch1.size() > MAX_OP_RETURN_RELAY)
+                    break;
+            }
+            else if (opcode1 != opcode2 || vch1 != vch2)
+            {
+                // Others must match exactly
+                break;
+            }
+        }
+    }
+
+    vSolutionsRet.clear();
+    typeRet = TX_NONSTANDARD;
+    return false;
+}
+
+int ScriptSigArgsExpected(txnouttype t, const std::vector<std::vector<unsigned char> >& vSolutions)
+{
+    switch (t)
+    {
+    case TX_NONSTANDARD:
+    case TX_NULL_DATA:
+        return -1;
+    case TX_PUBKEY:
+        return 1;
+    case TX_PUBKEYHASH:
+        return 2;
+    case TX_MULTISIG:
+        if (vSolutions.size() < 1 || vSolutions[0].size() < 1)
+            return -1;
+        return vSolutions[0][0] + 1;
+    case TX_SCRIPTHASH:
+        return 1; // doesn't include args needed by the script
+    }
+    return -1;
+}
+
+bool IsStandard(const CScript& scriptPubKey, txnouttype& whichType)
+{
+    vector<valtype> vSolutions;
+    if (!Solver(scriptPubKey, whichType, vSolutions))
+        return false;
+
+    if (whichType == TX_MULTISIG)
+    {
+        unsigned char m = vSolutions.front()[0];
+        unsigned char n = vSolutions.back()[0];
+        // Support up to x-of-3 multisig txns as standard
+        if (n < 1 || n > 3)
+            return false;
+        if (m < 1 || m > n)
+            return false;
+    }
+
+    return whichType != TX_NONSTANDARD;
+}
+
+bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet)
+{
+    vector<valtype> vSolutions;
+    txnouttype whichType;
+    if (!Solver(scriptPubKey, whichType, vSolutions))
+        return false;
+
+    if (whichType == TX_PUBKEY)
+    {
+        addressRet = CPubKey(vSolutions[0]).GetID();
+        return true;
+    }
+    else if (whichType == TX_PUBKEYHASH)
+    {
+        addressRet = CKeyID(uint160(vSolutions[0]));
+        return true;
+    }
+    else if (whichType == TX_SCRIPTHASH)
+    {
+        addressRet = CScriptID(uint160(vSolutions[0]));
+        return true;
+    }
+    // Multisig txns have more than one address...
+    return false;
+}
+
+bool ExtractDestinations(const CScript& scriptPubKey, txnouttype& typeRet, vector<CTxDestination>& addressRet, int& nRequiredRet)
+{
+    addressRet.clear();
+    typeRet = TX_NONSTANDARD;
+    vector<valtype> vSolutions;
+    if (!Solver(scriptPubKey, typeRet, vSolutions))
+        return false;
+    if (typeRet == TX_NULL_DATA){
+        // This is data, not addresses
+        return false;
+    }
+
+    if (typeRet == TX_MULTISIG)
+    {
+        nRequiredRet = vSolutions.front()[0];
+        for (unsigned int i = 1; i < vSolutions.size()-1; i++)
+        {
+            CTxDestination address = CPubKey(vSolutions[i]).GetID();
+            addressRet.push_back(address);
+        }
+    }
+    else
+    {
+        nRequiredRet = 1;
+        CTxDestination address;
+        if (!ExtractDestination(scriptPubKey, address))
+           return false;
+        addressRet.push_back(address);
+    }
+
+    return true;
+}
diff --git a/src/script/standard.h b/src/script/standard.h
new file mode 100644
index 000000000..18092e879
--- /dev/null
+++ b/src/script/standard.h
@@ -0,0 +1,56 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2013 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef H_BITCOIN_SCRIPT_STANDARD
+#define H_BITCOIN_SCRIPT_STANDARD
+
+#include "script/script.h"
+#include "script/interpreter.h"
+
+#include <stdint.h>
+
+class CScript;
+
+static const unsigned int MAX_OP_RETURN_RELAY = 40;      // bytes
+
+// Mandatory script verification flags that all new blocks must comply with for
+// them to be valid. (but old blocks may not comply with) Currently just P2SH,
+// but in the future other flags may be added, such as a soft-fork to enforce
+// strict DER encoding.
+//
+// Failing one of these tests may trigger a DoS ban - see CheckInputs() for
+// details.
+static const unsigned int MANDATORY_SCRIPT_VERIFY_FLAGS = SCRIPT_VERIFY_P2SH;
+
+// Standard script verification flags that standard transactions will comply
+// with. However scripts violating these flags may still be present in valid
+// blocks and we must accept those blocks.
+static const unsigned int STANDARD_SCRIPT_VERIFY_FLAGS = MANDATORY_SCRIPT_VERIFY_FLAGS |
+                                                         SCRIPT_VERIFY_STRICTENC |
+                                                         SCRIPT_VERIFY_NULLDUMMY;
+
+// For convenience, standard but not mandatory verify flags.
+static const unsigned int STANDARD_NOT_MANDATORY_VERIFY_FLAGS = STANDARD_SCRIPT_VERIFY_FLAGS & ~MANDATORY_SCRIPT_VERIFY_FLAGS;
+
+enum txnouttype
+{
+    TX_NONSTANDARD,
+    // 'standard' transaction types:
+    TX_PUBKEY,
+    TX_PUBKEYHASH,
+    TX_SCRIPTHASH,
+    TX_MULTISIG,
+    TX_NULL_DATA,
+};
+
+const char* GetTxnOutputType(txnouttype t);
+
+bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<std::vector<unsigned char> >& vSolutionsRet);
+int ScriptSigArgsExpected(txnouttype t, const std::vector<std::vector<unsigned char> >& vSolutions);
+bool IsStandard(const CScript& scriptPubKey, txnouttype& whichType);
+bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet);
+bool ExtractDestinations(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<CTxDestination>& addressRet, int& nRequiredRet);
+
+#endif
diff --git a/src/scriptutils.cpp b/src/scriptutils.cpp
new file mode 100644
index 000000000..a636eeeda
--- /dev/null
+++ b/src/scriptutils.cpp
@@ -0,0 +1,127 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2013 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 "scriptutils.h"
+
+#include "key.h"
+#include "keystore.h"
+#include "script/standard.h"
+
+#include <boost/foreach.hpp>
+
+using namespace std;
+
+typedef vector<unsigned char> valtype;
+
+unsigned int HaveKeys(const vector<valtype>& pubkeys, const CKeyStore& keystore)
+{
+    unsigned int nResult = 0;
+    BOOST_FOREACH(const valtype& pubkey, pubkeys)
+    {
+        CKeyID keyID = CPubKey(pubkey).GetID();
+        if (keystore.HaveKey(keyID))
+            ++nResult;
+    }
+    return nResult;
+}
+
+isminetype IsMine(const CKeyStore &keystore, const CTxDestination& dest)
+{
+    CScript script;
+    script.SetDestination(dest);
+    return IsMine(keystore, script);
+}
+
+isminetype IsMine(const CKeyStore &keystore, const CScript& scriptPubKey)
+{
+    vector<valtype> vSolutions;
+    txnouttype whichType;
+    if (!Solver(scriptPubKey, whichType, vSolutions)) {
+        if (keystore.HaveWatchOnly(scriptPubKey))
+            return ISMINE_WATCH_ONLY;
+        return ISMINE_NO;
+    }
+
+    CKeyID keyID;
+    switch (whichType)
+    {
+    case TX_NONSTANDARD:
+    case TX_NULL_DATA:
+        break;
+    case TX_PUBKEY:
+        keyID = CPubKey(vSolutions[0]).GetID();
+        if (keystore.HaveKey(keyID))
+            return ISMINE_SPENDABLE;
+        break;
+    case TX_PUBKEYHASH:
+        keyID = CKeyID(uint160(vSolutions[0]));
+        if (keystore.HaveKey(keyID))
+            return ISMINE_SPENDABLE;
+        break;
+    case TX_SCRIPTHASH:
+    {
+        CScriptID scriptID = CScriptID(uint160(vSolutions[0]));
+        CScript subscript;
+        if (keystore.GetCScript(scriptID, subscript)) {
+            isminetype ret = IsMine(keystore, subscript);
+            if (ret == ISMINE_SPENDABLE)
+                return ret;
+        }
+        break;
+    }
+    case TX_MULTISIG:
+    {
+        // Only consider transactions "mine" if we own ALL the
+        // keys involved. multi-signature transactions that are
+        // partially owned (somebody else has a key that can spend
+        // them) enable spend-out-from-under-you attacks, especially
+        // in shared-wallet situations.
+        vector<valtype> keys(vSolutions.begin()+1, vSolutions.begin()+vSolutions.size()-1);
+        if (HaveKeys(keys, keystore) == keys.size())
+            return ISMINE_SPENDABLE;
+        break;
+    }
+    }
+
+    if (keystore.HaveWatchOnly(scriptPubKey))
+        return ISMINE_WATCH_ONLY;
+    return ISMINE_NO;
+}
+
+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 ExtractAffectedKeys(const CKeyStore &keystore, const CScript& scriptPubKey, std::vector<CKeyID> &vKeys) {
+    CAffectedKeysVisitor(keystore, vKeys).Process(scriptPubKey);
+}
diff --git a/src/scriptutils.h b/src/scriptutils.h
new file mode 100644
index 000000000..98080fc45
--- /dev/null
+++ b/src/scriptutils.h
@@ -0,0 +1,29 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2013 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef H_BITCOIN_SCRIPTUTILS
+#define H_BITCOIN_SCRIPTUTILS
+
+#include "key.h"
+#include "script/script.h"
+
+class CKeyStore;
+
+/** IsMine() return codes */
+enum isminetype
+{
+    ISMINE_NO = 0,
+    ISMINE_WATCH_ONLY = 1,
+    ISMINE_SPENDABLE = 2,
+    ISMINE_ALL = ISMINE_WATCH_ONLY | ISMINE_SPENDABLE
+};
+/** used for bitflags of isminetype */
+typedef uint8_t isminefilter;
+
+isminetype IsMine(const CKeyStore& keystore, const CScript& scriptPubKey);
+isminetype IsMine(const CKeyStore& keystore, const CTxDestination& dest);
+void ExtractAffectedKeys(const CKeyStore &keystore, const CScript& scriptPubKey, std::vector<CKeyID> &vKeys);
+
+#endif // H_BITCOIN_SCRIPT
diff --git a/src/test/DoS_tests.cpp b/src/test/DoS_tests.cpp
index 8fa38c360..fa4edff63 100644
--- a/src/test/DoS_tests.cpp
+++ b/src/test/DoS_tests.cpp
@@ -12,7 +12,7 @@
 #include "main.h"
 #include "net.h"
 #include "pow.h"
-#include "script.h"
+#include "script/sign.h"
 #include "serialize.h"
 #include "util.h"
 
diff --git a/src/test/base58_tests.cpp b/src/test/base58_tests.cpp
index 0ac3e9a36..fe68e9e97 100644
--- a/src/test/base58_tests.cpp
+++ b/src/test/base58_tests.cpp
@@ -9,7 +9,7 @@
 #include "data/base58_keys_valid.json.h"
 
 #include "key.h"
-#include "script.h"
+#include "script/script.h"
 #include "uint256.h"
 #include "util.h"
 
diff --git a/src/test/canonical_tests.cpp b/src/test/canonical_tests.cpp
index a9798623e..a17099de7 100644
--- a/src/test/canonical_tests.cpp
+++ b/src/test/canonical_tests.cpp
@@ -8,9 +8,11 @@
 
 #include "data/sig_noncanonical.json.h"
 #include "data/sig_canonical.json.h"
+#include "key.h"
 #include "random.h"
-#include "script.h"
+#include "script/interpreter.h"
 #include "util.h"
+#include "utilstrencodings.h"
 
 #include <boost/foreach.hpp>
 #include <boost/test/unit_test.hpp>
diff --git a/src/test/key_tests.cpp b/src/test/key_tests.cpp
index 864d90128..203c20731 100644
--- a/src/test/key_tests.cpp
+++ b/src/test/key_tests.cpp
@@ -5,7 +5,7 @@
 #include "key.h"
 
 #include "base58.h"
-#include "script.h"
+#include "script/script.h"
 #include "uint256.h"
 #include "util.h"
 
diff --git a/src/test/multisig_tests.cpp b/src/test/multisig_tests.cpp
index 02c6d095f..6c5afa130 100644
--- a/src/test/multisig_tests.cpp
+++ b/src/test/multisig_tests.cpp
@@ -5,7 +5,10 @@
 #include "key.h"
 #include "keystore.h"
 #include "main.h"
-#include "script.h"
+#include "script/script.h"
+#include "script/interpreter.h"
+#include "script/sign.h"
+#include "scriptutils.h"
 #include "uint256.h"
 
 #include <boost/assign/std/vector.hpp>
diff --git a/src/test/script_P2SH_tests.cpp b/src/test/script_P2SH_tests.cpp
index 51ff1ffbc..b7e7487bb 100644
--- a/src/test/script_P2SH_tests.cpp
+++ b/src/test/script_P2SH_tests.cpp
@@ -2,12 +2,12 @@
 // Distributed under the MIT/X11 software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#include "script.h"
-
 #include "key.h"
 #include "keystore.h"
 #include "main.h"
-#include "script.h"
+#include "script/script.h"
+#include "script/sign.h"
+#include "scriptutils.h"
 
 #include <vector>
 
diff --git a/src/test/script_tests.cpp b/src/test/script_tests.cpp
index 77c44501a..88efc3896 100644
--- a/src/test/script_tests.cpp
+++ b/src/test/script_tests.cpp
@@ -2,15 +2,14 @@
 // Distributed under the MIT/X11 software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#include "script.h"
-
 #include "data/script_invalid.json.h"
 #include "data/script_valid.json.h"
 
 #include "key.h"
 #include "keystore.h"
 #include "main.h"
-#include "script.h"
+#include "script/script.h"
+#include "script/sign.h"
 #include "core_io.h"
 
 #include <fstream>
diff --git a/src/test/scriptnum_tests.cpp b/src/test/scriptnum_tests.cpp
index cd194cc4d..ac60fa426 100644
--- a/src/test/scriptnum_tests.cpp
+++ b/src/test/scriptnum_tests.cpp
@@ -3,7 +3,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "bignum.h"
-#include "script.h"
+#include "script/script.h"
 #include <boost/test/unit_test.hpp>
 #include <limits.h>
 #include <stdint.h>
diff --git a/src/test/sighash_tests.cpp b/src/test/sighash_tests.cpp
index bff151cdd..8abde887c 100644
--- a/src/test/sighash_tests.cpp
+++ b/src/test/sighash_tests.cpp
@@ -6,7 +6,8 @@
 #include "main.h"
 #include "random.h"
 #include "serialize.h"
-#include "script.h"
+#include "script/script.h"
+#include "script/interpreter.h"
 #include "util.h"
 #include "version.h"
 
diff --git a/src/test/sigopcount_tests.cpp b/src/test/sigopcount_tests.cpp
index 722f14a98..2d10c356a 100644
--- a/src/test/sigopcount_tests.cpp
+++ b/src/test/sigopcount_tests.cpp
@@ -3,7 +3,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "key.h"
-#include "script.h"
+#include "script/script.h"
 #include "uint256.h"
 
 #include <vector>
diff --git a/src/test/transaction_tests.cpp b/src/test/transaction_tests.cpp
index 03919e7c7..943568e89 100644
--- a/src/test/transaction_tests.cpp
+++ b/src/test/transaction_tests.cpp
@@ -8,7 +8,7 @@
 #include "key.h"
 #include "keystore.h"
 #include "main.h"
-#include "script.h"
+#include "script/script.h"
 #include "core_io.h"
 
 #include <map>
diff --git a/src/wallet.cpp b/src/wallet.cpp
index d3ad4869b..b69ed223b 100644
--- a/src/wallet.cpp
+++ b/src/wallet.cpp
@@ -9,6 +9,8 @@
 #include "checkpoints.h"
 #include "coincontrol.h"
 #include "net.h"
+#include "script/script.h"
+#include "script/sign.h"
 #include "timedata.h"
 #include "util.h"
 #include "utilmoneystr.h"
diff --git a/src/wallet.h b/src/wallet.h
index f8e1ebac1..6788986f8 100644
--- a/src/wallet.h
+++ b/src/wallet.h
@@ -11,6 +11,7 @@
 #include "key.h"
 #include "keystore.h"
 #include "main.h"
+#include "scriptutils.h"
 #include "ui_interface.h"
 #include "walletdb.h"