diff --git a/src/Makefile.am b/src/Makefile.am
index 3643e60201d..9c7b294d354 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -192,6 +192,7 @@ libbitcoin_util_a_SOURCES = \
   chainparamsbase.cpp \
   rpcprotocol.cpp \
   sync.cpp \
+  uint256.cpp \
   util.cpp \
   version.cpp \
   compat/glibc_sanity.cpp \
diff --git a/src/uint256.cpp b/src/uint256.cpp
new file mode 100644
index 00000000000..3392f1e9bcc
--- /dev/null
+++ b/src/uint256.cpp
@@ -0,0 +1,292 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2014 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 "uint256.h"
+#include "util.h"
+
+#include <stdio.h>
+#include <string.h>
+
+template<unsigned int BITS>
+base_uint<BITS>::base_uint(const std::string& str)
+{
+    SetHex(str);
+}
+
+template<unsigned int BITS>
+base_uint<BITS>::base_uint(const std::vector<unsigned char>& vch)
+{
+    if (vch.size() != sizeof(pn))
+        throw uint_error("Converting vector of wrong size to base_uint");
+    memcpy(pn, &vch[0], sizeof(pn));
+}
+
+template<unsigned int BITS>
+base_uint<BITS>& base_uint<BITS>::operator<<=(unsigned int shift)
+{
+    base_uint<BITS> a(*this);
+    for (int i = 0; i < WIDTH; i++)
+        pn[i] = 0;
+    int k = shift / 32;
+    shift = shift % 32;
+    for (int i = 0; i < WIDTH; i++) {
+        if (i+k+1 < WIDTH && shift != 0)
+            pn[i+k+1] |= (a.pn[i] >> (32-shift));
+        if (i+k < WIDTH)
+            pn[i+k] |= (a.pn[i] << shift);
+    }
+    return *this;
+}
+
+template<unsigned int BITS>
+base_uint<BITS>& base_uint<BITS>::operator>>=(unsigned int shift)
+{
+    base_uint<BITS> a(*this);
+    for (int i = 0; i < WIDTH; i++)
+        pn[i] = 0;
+    int k = shift / 32;
+    shift = shift % 32;
+    for (int i = 0; i < WIDTH; i++) {
+        if (i-k-1 >= 0 && shift != 0)
+            pn[i-k-1] |= (a.pn[i] << (32-shift));
+        if (i-k >= 0)
+            pn[i-k] |= (a.pn[i] >> shift);
+    }
+    return *this;
+}
+
+template<unsigned int BITS>
+base_uint<BITS>& base_uint<BITS>::operator*=(uint32_t b32)
+{
+    uint64_t carry = 0;
+    for (int i = 0; i < WIDTH; i++) {
+        uint64_t n = carry + (uint64_t)b32 * pn[i];
+        pn[i] = n & 0xffffffff;
+        carry = n >> 32;
+    }
+    return *this;
+}
+
+template<unsigned int BITS>
+base_uint<BITS>& base_uint<BITS>::operator*=(const base_uint& b)
+{
+    base_uint<BITS> a = *this;
+    *this = 0;
+    for (int j = 0; j < WIDTH; j++) {
+        uint64_t carry = 0;
+        for (int i = 0; i + j < WIDTH; i++) {
+            uint64_t n = carry + pn[i + j] + (uint64_t)a.pn[j] * b.pn[i];
+            pn[i + j] = n & 0xffffffff;
+            carry = n >> 32;
+        }
+    }
+    return *this;
+}
+
+template<unsigned int BITS>
+base_uint<BITS>& base_uint<BITS>::operator/=(const base_uint& b)
+{
+    base_uint<BITS> div = b; // make a copy, so we can shift.
+    base_uint<BITS> num = *this; // make a copy, so we can subtract.
+    *this = 0; // the quotient.
+    int num_bits = num.bits();
+    int div_bits = div.bits();
+    if (div_bits == 0)
+        throw uint_error("Division by zero");
+    if (div_bits > num_bits) // the result is certainly 0.
+        return *this;
+    int shift = num_bits - div_bits;
+    div <<= shift; // shift so that div and nun align.
+    while (shift >= 0) {
+        if (num >= div) {
+            num -= div;
+            pn[shift / 32] |= (1 << (shift & 31)); // set a bit of the result.
+        }
+        div >>= 1; // shift back.
+        shift--;
+    }
+    // num now contains the remainder of the division.
+    return *this;
+}
+
+template<unsigned int BITS>
+int base_uint<BITS>::CompareTo(const base_uint<BITS>& b) const {
+    for (int i = WIDTH-1; i >= 0; i--) {
+        if (pn[i] < b.pn[i])
+            return -1;
+        if (pn[i] > b.pn[i])
+            return 1;
+    }
+    return 0;
+}
+
+template<unsigned int BITS>
+bool base_uint<BITS>::EqualTo(uint64_t b) const {
+    for (int i = WIDTH-1; i >= 2; i--) {
+        if (pn[i])
+            return false;
+    }
+    if (pn[1] != (b >> 32))
+        return false;
+    if (pn[0] != (b & 0xfffffffful))
+        return false;
+    return true;
+}
+
+template<unsigned int BITS>
+double base_uint<BITS>::getdouble() const
+{
+    double ret = 0.0;
+    double fact = 1.0;
+    for (int i = 0; i < WIDTH; i++) {
+        ret += fact * pn[i];
+        fact *= 4294967296.0;
+    }
+    return ret;
+}
+
+template<unsigned int BITS>
+std::string base_uint<BITS>::GetHex() const
+{
+    char psz[sizeof(pn)*2 + 1];
+    for (unsigned int i = 0; i < sizeof(pn); i++)
+        sprintf(psz + i*2, "%02x", ((unsigned char*)pn)[sizeof(pn) - i - 1]);
+    return std::string(psz, psz + sizeof(pn)*2);
+}
+
+template<unsigned int BITS>
+void base_uint<BITS>::SetHex(const char* psz)
+{
+    memset(pn,0,sizeof(pn));
+
+    // skip leading spaces
+    while (isspace(*psz))
+        psz++;
+
+    // skip 0x
+    if (psz[0] == '0' && tolower(psz[1]) == 'x')
+        psz += 2;
+
+    // hex string to uint
+    const char* pbegin = psz;
+    while (::HexDigit(*psz) != -1)
+        psz++;
+    psz--;
+    unsigned char* p1 = (unsigned char*)pn;
+    unsigned char* pend = p1 + WIDTH * 4;
+    while (psz >= pbegin && p1 < pend) {
+        *p1 = ::HexDigit(*psz--);
+        if (psz >= pbegin) {
+            *p1 |= ((unsigned char)::HexDigit(*psz--) << 4);
+            p1++;
+        }
+    }
+}
+
+template<unsigned int BITS>
+void base_uint<BITS>::SetHex(const std::string& str)
+{
+    SetHex(str.c_str());
+}
+
+template<unsigned int BITS>
+std::string base_uint<BITS>::ToString() const
+{
+    return (GetHex());
+}
+
+template<unsigned int BITS>
+unsigned int base_uint<BITS>::bits() const
+{
+    for (int pos = WIDTH-1; pos >= 0; pos--) {
+        if (pn[pos]) {
+            for (int bits = 31; bits > 0; bits--) {
+                if (pn[pos] & 1<<bits)
+                    return 32*pos + bits + 1;
+            }
+            return 32*pos + 1;
+        }
+    }
+    return 0;
+}
+
+// Explicit instantiations for base_uint<160>
+template base_uint<160>::base_uint(const std::string&);
+template base_uint<160>::base_uint(const std::vector<unsigned char>&);
+template base_uint<160>& base_uint<160>::operator<<=(unsigned int);
+template base_uint<160>& base_uint<160>::operator>>=(unsigned int);
+template base_uint<160>& base_uint<160>::operator*=(uint32_t b32);
+template base_uint<160>& base_uint<160>::operator*=(const base_uint<160>& b);
+template base_uint<160>& base_uint<160>::operator/=(const base_uint<160>& b);
+template int base_uint<160>::CompareTo(const base_uint<160>&) const;
+template bool base_uint<160>::EqualTo(uint64_t) const;
+template double base_uint<160>::getdouble() const;
+template std::string base_uint<160>::GetHex() const;
+template std::string base_uint<160>::ToString() const;
+template void base_uint<160>::SetHex(const char*);
+template void base_uint<160>::SetHex(const std::string&);
+template unsigned int base_uint<160>::bits() const;
+
+// Explicit instantiations for base_uint<256>
+template base_uint<256>::base_uint(const std::string&);
+template base_uint<256>::base_uint(const std::vector<unsigned char>&);
+template base_uint<256>& base_uint<256>::operator<<=(unsigned int);
+template base_uint<256>& base_uint<256>::operator>>=(unsigned int);
+template base_uint<256>& base_uint<256>::operator*=(uint32_t b32);
+template base_uint<256>& base_uint<256>::operator*=(const base_uint<256>& b);
+template base_uint<256>& base_uint<256>::operator/=(const base_uint<256>& b);
+template int base_uint<256>::CompareTo(const base_uint<256>&) const;
+template bool base_uint<256>::EqualTo(uint64_t) const;
+template double base_uint<256>::getdouble() const;
+template std::string base_uint<256>::GetHex() const;
+template std::string base_uint<256>::ToString() const;
+template void base_uint<256>::SetHex(const char*);
+template void base_uint<256>::SetHex(const std::string&);
+template unsigned int base_uint<256>::bits() const;
+
+// This implementation directly uses shifts instead of going
+// through an intermediate MPI representation.
+uint256& uint256::SetCompact(uint32_t nCompact, bool *pfNegative, bool *pfOverflow)
+{
+    int nSize = nCompact >> 24;
+    uint32_t nWord = nCompact & 0x007fffff;
+    if (nSize <= 3) {
+        nWord >>= 8*(3-nSize);
+        *this = nWord;
+    } else {
+        *this = nWord;
+        *this <<= 8*(nSize-3);
+    }
+    if (pfNegative)
+        *pfNegative = nWord != 0 && (nCompact & 0x00800000) != 0;
+    if (pfOverflow)
+        *pfOverflow = nWord != 0 && ((nSize > 34) ||
+                                     (nWord > 0xff && nSize > 33) ||
+                                     (nWord > 0xffff && nSize > 32));
+    return *this;
+}
+
+uint32_t uint256::GetCompact(bool fNegative) const
+{
+    int nSize = (bits() + 7) / 8;
+    uint32_t nCompact = 0;
+    if (nSize <= 3) {
+        nCompact = GetLow64() << 8*(3-nSize);
+    } else {
+        uint256 bn = *this >> 8*(nSize-3);
+        nCompact = bn.GetLow64();
+    }
+    // The 0x00800000 bit denotes the sign.
+    // Thus, if it is already set, divide the mantissa by 256 and increase the exponent.
+    if (nCompact & 0x00800000) {
+        nCompact >>= 8;
+        nSize++;
+    }
+    assert((nCompact & ~0x007fffff) == 0);
+    assert(nSize < 256);
+    nCompact |= nSize << 24;
+    nCompact |= (fNegative && (nCompact & 0x007fffff) ? 0x00800000 : 0);
+    return nCompact;
+}
diff --git a/src/uint256.h b/src/uint256.h
index 1acedd14bf6..82db7758c93 100644
--- a/src/uint256.h
+++ b/src/uint256.h
@@ -9,18 +9,9 @@
 #include <assert.h>
 #include <stdexcept>
 #include <stdint.h>
-#include <stdio.h>
 #include <string>
-#include <string.h>
 #include <vector>
 
-extern const signed char p_util_hexdigit[256]; // defined in util.cpp
-
-inline signed char HexDigit(char c)
-{
-    return p_util_hexdigit[(unsigned char)c];
-}
-
 class uint_error : public std::runtime_error {
 public:
     explicit uint_error(const std::string& str) : std::runtime_error(str) {}
@@ -62,17 +53,8 @@ public:
             pn[i] = 0;
     }
 
-    explicit base_uint(const std::string& str)
-    {
-        SetHex(str);
-    }
-
-    explicit base_uint(const std::vector<unsigned char>& vch)
-    {
-        if (vch.size() != sizeof(pn))
-            throw uint_error("Converting vector of wrong size to base_uint");
-        memcpy(pn, &vch[0], sizeof(pn));
-    }
+    explicit base_uint(const std::string& str);
+    explicit base_uint(const std::vector<unsigned char>& vch);
 
     bool operator!() const
     {
@@ -99,16 +81,7 @@ public:
         return ret;
     }
 
-    double getdouble() const
-    {
-        double ret = 0.0;
-        double fact = 1.0;
-        for (int i = 0; i < WIDTH; i++) {
-            ret += fact * pn[i];
-            fact *= 4294967296.0;
-        }
-        return ret;
-    }
+    double getdouble() const;
 
     base_uint& operator=(uint64_t b)
     {
@@ -154,39 +127,8 @@ public:
         return *this;
     }
 
-    base_uint& operator<<=(unsigned int shift)
-    {
-        base_uint a(*this);
-        for (int i = 0; i < WIDTH; i++)
-            pn[i] = 0;
-        int k = shift / 32;
-        shift = shift % 32;
-        for (int i = 0; i < WIDTH; i++)
-        {
-            if (i+k+1 < WIDTH && shift != 0)
-                pn[i+k+1] |= (a.pn[i] >> (32-shift));
-            if (i+k < WIDTH)
-                pn[i+k] |= (a.pn[i] << shift);
-        }
-        return *this;
-    }
-
-    base_uint& operator>>=(unsigned int shift)
-    {
-        base_uint a(*this);
-        for (int i = 0; i < WIDTH; i++)
-            pn[i] = 0;
-        int k = shift / 32;
-        shift = shift % 32;
-        for (int i = 0; i < WIDTH; i++)
-        {
-            if (i-k-1 >= 0 && shift != 0)
-                pn[i-k-1] |= (a.pn[i] << (32-shift));
-            if (i-k >= 0)
-                pn[i-k] |= (a.pn[i] >> shift);
-        }
-        return *this;
-    }
+    base_uint& operator<<=(unsigned int shift);
+    base_uint& operator>>=(unsigned int shift);
 
     base_uint& operator+=(const base_uint& b)
     {
@@ -222,57 +164,9 @@ public:
         return *this;
     }
 
-    base_uint& operator*=(uint32_t b32)
-    {
-        uint64_t carry = 0;
-        for (int i = 0; i < WIDTH; i++)
-        {
-            uint64_t n = carry + (uint64_t)b32 * pn[i];
-            pn[i] = n & 0xffffffff;
-            carry = n >> 32;
-        }
-        return *this;
-    }
-
-    base_uint& operator*=(const base_uint& b)
-    {
-        base_uint a = *this;
-        *this = 0;
-        for (int j = 0; j < WIDTH; j++) {
-            uint64_t carry = 0;
-            for (int i = 0; i + j < WIDTH; i++) {
-                uint64_t n = carry + pn[i + j] + (uint64_t)a.pn[j] * b.pn[i];
-                pn[i + j] = n & 0xffffffff;
-                carry = n >> 32;
-            }
-        }
-        return *this;
-    }
-
-    base_uint& operator/=(const base_uint& b)
-    {
-        base_uint div = b; // make a copy, so we can shift.
-        base_uint num = *this; // make a copy, so we can subtract.
-        *this = 0; // the quotient.
-        int num_bits = num.bits();
-        int div_bits = div.bits();
-        if (div_bits == 0)
-            throw uint_error("Division by zero");
-        if (div_bits > num_bits) // the result is certainly 0.
-            return *this;
-        int shift = num_bits - div_bits;
-        div <<= shift; // shift so that div and nun align.
-        while (shift >= 0) {
-            if (num >= div) {
-                num -= div;
-                pn[shift / 32] |= (1 << (shift & 31)); // set a bit of the result.
-            }
-            div >>= 1; // shift back.
-            shift--;
-        }
-        // num now contains the remainder of the division.
-        return *this;
-    }
+    base_uint& operator*=(uint32_t b32);
+    base_uint& operator*=(const base_uint& b);
+    base_uint& operator/=(const base_uint& b);
 
     base_uint& operator++()
     {
@@ -308,27 +202,8 @@ public:
         return ret;
     }
 
-    int CompareTo(const base_uint& b) const {
-        for (int i = base_uint::WIDTH-1; i >= 0; i--) {
-            if (pn[i] < b.pn[i])
-                return -1;
-            if (pn[i] > b.pn[i])
-                return 1;
-        }
-        return 0;
-    }
-
-    bool EqualTo(uint64_t b) const {
-        for (int i = base_uint::WIDTH-1; i >= 2; i--) {
-            if (pn[i])
-                return false;
-        }
-        if (pn[1] != (b >> 32))
-            return false;
-        if (pn[0] != (b & 0xfffffffful))
-            return false;
-        return true;
-    }
+    int CompareTo(const base_uint& b) const;
+    bool EqualTo(uint64_t b) const;
 
     friend inline const base_uint operator+(const base_uint& a, const base_uint& b) { return base_uint(a) += b; }
     friend inline const base_uint operator-(const base_uint& a, const base_uint& b) { return base_uint(a) -= b; }
@@ -349,53 +224,10 @@ public:
     friend inline bool operator==(const base_uint& a, uint64_t b) { return a.EqualTo(b); }
     friend inline bool operator!=(const base_uint& a, uint64_t b) { return !a.EqualTo(b); }
 
-    std::string GetHex() const
-    {
-        char psz[sizeof(pn)*2 + 1];
-        for (unsigned int i = 0; i < sizeof(pn); i++)
-            sprintf(psz + i*2, "%02x", ((unsigned char*)pn)[sizeof(pn) - i - 1]);
-        return std::string(psz, psz + sizeof(pn)*2);
-    }
-
-    void SetHex(const char* psz)
-    {
-        memset(pn,0,sizeof(pn));
-
-        // skip leading spaces
-        while (isspace(*psz))
-            psz++;
-
-        // skip 0x
-        if (psz[0] == '0' && tolower(psz[1]) == 'x')
-            psz += 2;
-
-        // hex string to uint
-        const char* pbegin = psz;
-        while (::HexDigit(*psz) != -1)
-            psz++;
-        psz--;
-        unsigned char* p1 = (unsigned char*)pn;
-        unsigned char* pend = p1 + WIDTH * 4;
-        while (psz >= pbegin && p1 < pend)
-        {
-            *p1 = ::HexDigit(*psz--);
-            if (psz >= pbegin)
-            {
-                *p1 |= ((unsigned char)::HexDigit(*psz--) << 4);
-                p1++;
-            }
-        }
-    }
-
-    void SetHex(const std::string& str)
-    {
-        SetHex(str.c_str());
-    }
-
-    std::string ToString() const
-    {
-        return (GetHex());
-    }
+    std::string GetHex() const;
+    void SetHex(const char* psz);
+    void SetHex(const std::string& str);
+    std::string ToString() const;
 
     unsigned char* begin()
     {
@@ -424,19 +256,7 @@ public:
 
     // Returns the position of the highest bit set plus one, or zero if the
     // value is zero.
-    unsigned int bits() const
-    {
-        for (int pos = WIDTH-1; pos >= 0; pos--) {
-            if (pn[pos]) {
-                for (int bits = 31; bits > 0; bits--) {
-                    if (pn[pos] & 1<<bits)
-                        return 32*pos + bits + 1;
-                }
-                return 32*pos + 1;
-            }
-        }
-        return 0;
-    }
+    unsigned int bits() const;
 
     uint64_t GetLow64() const
     {
@@ -500,56 +320,8 @@ public:
     // targets, which are unsigned 256bit quantities.  Thus, all the
     // complexities of the sign bit and using base 256 are probably an
     // implementation accident.
-    //
-    // This implementation directly uses shifts instead of going
-    // through an intermediate MPI representation.
-    uint256& SetCompact(uint32_t nCompact, bool *pfNegative = NULL, bool *pfOverflow = NULL)
-    {
-        int nSize = nCompact >> 24;
-        uint32_t nWord = nCompact & 0x007fffff;
-        if (nSize <= 3)
-        {
-            nWord >>= 8*(3-nSize);
-            *this = nWord;
-        }
-        else
-        {
-            *this = nWord;
-            *this <<= 8*(nSize-3);
-        }
-        if (pfNegative)
-            *pfNegative = nWord != 0 && (nCompact & 0x00800000) != 0;
-        if (pfOverflow)
-            *pfOverflow = nWord != 0 && ((nSize > 34) ||
-                                         (nWord > 0xff && nSize > 33) ||
-                                         (nWord > 0xffff && nSize > 32));
-        return *this;
-    }
-
-    uint32_t GetCompact(bool fNegative = false) const
-    {
-        int nSize = (bits() + 7) / 8;
-        uint32_t nCompact = 0;
-        if (nSize <= 3)
-            nCompact = GetLow64() << 8*(3-nSize);
-        else
-        {
-            uint256 bn = *this >> 8*(nSize-3);
-            nCompact = bn.GetLow64();
-        }
-        // The 0x00800000 bit denotes the sign.
-        // Thus, if it is already set, divide the mantissa by 256 and increase the exponent.
-        if (nCompact & 0x00800000)
-        {
-            nCompact >>= 8;
-            nSize++;
-        }
-        assert((nCompact & ~0x007fffff) == 0);
-        assert(nSize < 256);
-        nCompact |= nSize << 24;
-        nCompact |= (fNegative && (nCompact & 0x007fffff) ? 0x00800000 : 0);
-        return nCompact;
-    }
+    uint256& SetCompact(uint32_t nCompact, bool *pfNegative = NULL, bool *pfOverflow = NULL);
+    uint32_t GetCompact(bool fNegative = false) const;
 };
 
 #endif
diff --git a/src/util.cpp b/src/util.cpp
index 9591372f91f..5a8f85ade78 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -420,6 +420,11 @@ const signed char p_util_hexdigit[256] =
   -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
   -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, };
 
+signed char HexDigit(char c)
+{
+    return p_util_hexdigit[(unsigned char)c];
+}
+
 bool IsHex(const string& str)
 {
     BOOST_FOREACH(char c, str)
diff --git a/src/util.h b/src/util.h
index 6057c72e669..707b8f2d760 100644
--- a/src/util.h
+++ b/src/util.h
@@ -156,6 +156,7 @@ bool ParseMoney(const char* pszIn, int64_t& nRet);
 std::string SanitizeString(const std::string& str);
 std::vector<unsigned char> ParseHex(const char* psz);
 std::vector<unsigned char> ParseHex(const std::string& str);
+signed char HexDigit(char c);
 bool IsHex(const std::string& str);
 std::vector<unsigned char> DecodeBase64(const char* p, bool* pfInvalid = NULL);
 std::string DecodeBase64(const std::string& str);