diff --git a/src/Makefile.am b/src/Makefile.am
index 6d0e1ed7b..0385ad902 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -80,6 +80,7 @@ BITCOIN_CORE_H = \
   coincontrol.h \
   coins.h \
   compat.h \
+  compressor.h \
   core.h \
   core/transaction.h \
   core_io.h \
@@ -103,7 +104,6 @@ BITCOIN_CORE_H = \
   rpcclient.h \
   rpcprotocol.h \
   rpcserver.h \
-  script/compressor.h \
   script/interpreter.h \
   script/script.h \
   script/sigcache.h \
@@ -214,6 +214,7 @@ libbitcoin_common_a_SOURCES = \
   base58.cpp \
   chainparams.cpp \
   coins.cpp \
+  compressor.cpp \
   core.cpp \
   core/transaction.cpp \
   core_read.cpp \
@@ -223,7 +224,6 @@ libbitcoin_common_a_SOURCES = \
   keystore.cpp \
   netbase.cpp \
   protocol.cpp \
-  script/compressor.cpp \
   script/interpreter.cpp \
   script/script.cpp \
   script/sigcache.cpp \
diff --git a/src/coins.h b/src/coins.h
index 295b3d70d..ee9051562 100644
--- a/src/coins.h
+++ b/src/coins.h
@@ -6,8 +6,7 @@
 #ifndef BITCOIN_COINS_H
 #define BITCOIN_COINS_H
 
-#include "core.h" // Only for CTxOutCompressor
-#include "core/transaction.h"
+#include "compressor.h"
 #include "serialize.h"
 #include "uint256.h"
 #include "undo.h"
diff --git a/src/script/compressor.cpp b/src/compressor.cpp
similarity index 73%
rename from src/script/compressor.cpp
rename to src/compressor.cpp
index af1acf48d..806175dd3 100644
--- a/src/script/compressor.cpp
+++ b/src/compressor.cpp
@@ -5,6 +5,7 @@
 
 #include "compressor.h"
 
+#include "hash.h"
 #include "key.h"
 #include "script/standard.h"
 
@@ -128,3 +129,57 @@ bool CScriptCompressor::Decompress(unsigned int nSize, const std::vector<unsigne
     }
     return false;
 }
+
+// Amount compression:
+// * If the amount is 0, output 0
+// * first, divide the amount (in base units) by the largest power of 10 possible; call the exponent e (e is max 9)
+// * if e<9, the last digit of the resulting number cannot be 0; store it as d, and drop it (divide by 10)
+//   * call the result n
+//   * output 1 + 10*(9*n + d - 1) + e
+// * if e==9, we only know the resulting number is not zero, so output 1 + 10*(n - 1) + 9
+// (this is decodable, as d is in [1-9] and e is in [0-9])
+
+uint64_t CTxOutCompressor::CompressAmount(uint64_t n)
+{
+    if (n == 0)
+        return 0;
+    int e = 0;
+    while (((n % 10) == 0) && e < 9) {
+        n /= 10;
+        e++;
+    }
+    if (e < 9) {
+        int d = (n % 10);
+        assert(d >= 1 && d <= 9);
+        n /= 10;
+        return 1 + (n*9 + d - 1)*10 + e;
+    } else {
+        return 1 + (n - 1)*10 + 9;
+    }
+}
+
+uint64_t CTxOutCompressor::DecompressAmount(uint64_t x)
+{
+    // x = 0  OR  x = 1+10*(9*n + d - 1) + e  OR  x = 1+10*(n - 1) + 9
+    if (x == 0)
+        return 0;
+    x--;
+    // x = 10*(9*n + d - 1) + e
+    int e = x % 10;
+    x /= 10;
+    uint64_t n = 0;
+    if (e < 9) {
+        // x = 9*n + d - 1
+        int d = (x % 9) + 1;
+        x /= 9;
+        // x = n
+        n = x*10 + d;
+    } else {
+        n = x+1;
+    }
+    while (e) {
+        n *= 10;
+        e--;
+    }
+    return n;
+}
diff --git a/src/script/compressor.h b/src/compressor.h
similarity index 76%
rename from src/script/compressor.h
rename to src/compressor.h
index 154e0b266..a612c3a88 100644
--- a/src/script/compressor.h
+++ b/src/compressor.h
@@ -3,9 +3,10 @@
 // Distributed under the MIT 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
+#ifndef H_BITCOIN_COMPRESSOR
+#define H_BITCOIN_COMPRESSOR
 
+#include "core/transaction.h"
 #include "script/script.h"
 #include "serialize.h"
 
@@ -86,4 +87,33 @@ public:
     }
 };
 
-#endif // H_BITCOIN_SCRIPT_COMPRESSOR
+/** wrapper for CTxOut that provides a more compact serialization */
+class CTxOutCompressor
+{
+private:
+    CTxOut &txout;
+
+public:
+    static uint64_t CompressAmount(uint64_t nAmount);
+    static uint64_t DecompressAmount(uint64_t nAmount);
+
+    CTxOutCompressor(CTxOut &txoutIn) : txout(txoutIn) { }
+
+    ADD_SERIALIZE_METHODS;
+
+    template <typename Stream, typename Operation>
+    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+        if (!ser_action.ForRead()) {
+            uint64_t nVal = CompressAmount(txout.nValue);
+            READWRITE(VARINT(nVal));
+        } else {
+            uint64_t nVal = 0;
+            READWRITE(VARINT(nVal));
+            txout.nValue = DecompressAmount(nVal);
+        }
+        CScriptCompressor cscript(REF(txout.scriptPubKey));
+        READWRITE(cscript);
+    }
+};
+
+#endif // H_BITCOIN_COMPRESSOR
diff --git a/src/core.cpp b/src/core.cpp
index 34188bca6..08139d542 100644
--- a/src/core.cpp
+++ b/src/core.cpp
@@ -9,60 +9,6 @@
 #include "tinyformat.h"
 #include "utilstrencodings.h"
 
-// Amount compression:
-// * If the amount is 0, output 0
-// * first, divide the amount (in base units) by the largest power of 10 possible; call the exponent e (e is max 9)
-// * if e<9, the last digit of the resulting number cannot be 0; store it as d, and drop it (divide by 10)
-//   * call the result n
-//   * output 1 + 10*(9*n + d - 1) + e
-// * if e==9, we only know the resulting number is not zero, so output 1 + 10*(n - 1) + 9
-// (this is decodable, as d is in [1-9] and e is in [0-9])
-
-uint64_t CTxOutCompressor::CompressAmount(uint64_t n)
-{
-    if (n == 0)
-        return 0;
-    int e = 0;
-    while (((n % 10) == 0) && e < 9) {
-        n /= 10;
-        e++;
-    }
-    if (e < 9) {
-        int d = (n % 10);
-        assert(d >= 1 && d <= 9);
-        n /= 10;
-        return 1 + (n*9 + d - 1)*10 + e;
-    } else {
-        return 1 + (n - 1)*10 + 9;
-    }
-}
-
-uint64_t CTxOutCompressor::DecompressAmount(uint64_t x)
-{
-    // x = 0  OR  x = 1+10*(9*n + d - 1) + e  OR  x = 1+10*(n - 1) + 9
-    if (x == 0)
-        return 0;
-    x--;
-    // x = 10*(9*n + d - 1) + e
-    int e = x % 10;
-    x /= 10;
-    uint64_t n = 0;
-    if (e < 9) {
-        // x = 9*n + d - 1
-        int d = (x % 9) + 1;
-        x /= 9;
-        // x = n
-        n = x*10 + d;
-    } else {
-        n = x+1;
-    }
-    while (e) {
-        n *= 10;
-        e--;
-    }
-    return n;
-}
-
 uint256 CBlockHeader::GetHash() const
 {
     return Hash(BEGIN(nVersion), END(nNonce));
diff --git a/src/core.h b/src/core.h
index aeae9a191..b2288e24c 100644
--- a/src/core.h
+++ b/src/core.h
@@ -7,39 +7,9 @@
 #define BITCOIN_CORE_H
 
 #include "core/transaction.h"
-#include "script/compressor.h"
 #include "serialize.h"
 #include "uint256.h"
 
-/** wrapper for CTxOut that provides a more compact serialization */
-class CTxOutCompressor
-{
-private:
-    CTxOut &txout;
-
-public:
-    static uint64_t CompressAmount(uint64_t nAmount);
-    static uint64_t DecompressAmount(uint64_t nAmount);
-
-    CTxOutCompressor(CTxOut &txoutIn) : txout(txoutIn) { }
-
-    ADD_SERIALIZE_METHODS;
-
-    template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
-        if (!ser_action.ForRead()) {
-            uint64_t nVal = CompressAmount(txout.nValue);
-            READWRITE(VARINT(nVal));
-        } else {
-            uint64_t nVal = 0;
-            READWRITE(VARINT(nVal));
-            txout.nValue = DecompressAmount(nVal);
-        }
-        CScriptCompressor cscript(REF(txout.scriptPubKey));
-        READWRITE(cscript);
-    }
-};
-
 /** Nodes collect new transactions into a block, hash them into a hash tree,
  * and scan through nonce values to make the block's hash satisfy proof-of-work
  * requirements.  When they solve the proof-of-work, they broadcast the block
diff --git a/src/test/compress_tests.cpp b/src/test/compress_tests.cpp
index 719955ba8..bf404cf0c 100644
--- a/src/test/compress_tests.cpp
+++ b/src/test/compress_tests.cpp
@@ -2,7 +2,7 @@
 // Distributed under the MIT/X11 software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#include "main.h"
+#include "compressor.h"
 #include "util.h"
 
 #include <stdint.h>
diff --git a/src/undo.h b/src/undo.h
index 78e37f628..232c19342 100644
--- a/src/undo.h
+++ b/src/undo.h
@@ -6,7 +6,7 @@
 #ifndef H_BITCOIN_TXUNDO
 #define H_BITCOIN_TXUNDO
 
-#include "core.h" // Only for CTxOutCompressor
+#include "compressor.h" 
 #include "core/transaction.h"
 #include "serialize.h"