diff --git a/src/test/uint256_tests.cpp b/src/test/uint256_tests.cpp
index 28444a04d..da5f6a301 100644
--- a/src/test/uint256_tests.cpp
+++ b/src/test/uint256_tests.cpp
@@ -1,260 +1,271 @@
 // Copyright (c) 2011-2016 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 #include "arith_uint256.h"
 #include "test/test_bitcoin.h"
 #include "uint256.h"
 #include "version.h"
 
 #include <boost/test/unit_test.hpp>
 #include <cmath>
 #include <cstdint>
 #include <cstdio>
 #include <iomanip>
 #include <limits>
 #include <sstream>
 #include <string>
 
 BOOST_FIXTURE_TEST_SUITE(uint256_tests, BasicTestingSetup)
 
 const uint8_t R1Array[] =
     "\x9c\x52\x4a\xdb\xcf\x56\x11\x12\x2b\x29\x12\x5e\x5d\x35\xd2\xd2"
     "\x22\x81\xaa\xb5\x33\xf0\x08\x32\xd5\x56\xb1\xf9\xea\xe5\x1d\x7d";
 const char R1ArrayHex[] =
     "7D1DE5EAF9B156D53208F033B5AA8122D2d2355d5e12292b121156cfdb4a529c";
 const uint256 R1L = uint256(std::vector<uint8_t>(R1Array, R1Array + 32));
 const uint160 R1S = uint160(std::vector<uint8_t>(R1Array, R1Array + 20));
 
 const uint8_t R2Array[] =
     "\x70\x32\x1d\x7c\x47\xa5\x6b\x40\x26\x7e\x0a\xc3\xa6\x9c\xb6\xbf"
     "\x13\x30\x47\xa3\x19\x2d\xda\x71\x49\x13\x72\xf0\xb4\xca\x81\xd7";
 const uint256 R2L = uint256(std::vector<uint8_t>(R2Array, R2Array + 32));
 const uint160 R2S = uint160(std::vector<uint8_t>(R2Array, R2Array + 20));
 
 const uint8_t ZeroArray[] =
     "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
     "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
 const uint256 ZeroL = uint256(std::vector<uint8_t>(ZeroArray, ZeroArray + 32));
 const uint160 ZeroS = uint160(std::vector<uint8_t>(ZeroArray, ZeroArray + 20));
 
 const uint8_t OneArray[] =
     "\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
     "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
 const uint256 OneL = uint256(std::vector<uint8_t>(OneArray, OneArray + 32));
 const uint160 OneS = uint160(std::vector<uint8_t>(OneArray, OneArray + 20));
 
 const uint8_t MaxArray[] =
     "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
     "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff";
 const uint256 MaxL = uint256(std::vector<uint8_t>(MaxArray, MaxArray + 32));
 const uint160 MaxS = uint160(std::vector<uint8_t>(MaxArray, MaxArray + 20));
 
 std::string ArrayToString(const uint8_t A[], unsigned int width) {
     std::stringstream Stream;
     Stream << std::hex;
     for (unsigned int i = 0; i < width; ++i) {
         Stream << std::setw(2) << std::setfill('0')
                << (unsigned int)A[width - i - 1];
     }
     return Stream.str();
 }
 
 // constructors, equality, inequality
 BOOST_AUTO_TEST_CASE(basics) {
     BOOST_CHECK(1 == 0 + 1);
     // constructor uint256(vector<char>):
     BOOST_CHECK(R1L.ToString() == ArrayToString(R1Array, 32));
     BOOST_CHECK(R1S.ToString() == ArrayToString(R1Array, 20));
     BOOST_CHECK(R2L.ToString() == ArrayToString(R2Array, 32));
     BOOST_CHECK(R2S.ToString() == ArrayToString(R2Array, 20));
     BOOST_CHECK(ZeroL.ToString() == ArrayToString(ZeroArray, 32));
     BOOST_CHECK(ZeroS.ToString() == ArrayToString(ZeroArray, 20));
     BOOST_CHECK(OneL.ToString() == ArrayToString(OneArray, 32));
     BOOST_CHECK(OneS.ToString() == ArrayToString(OneArray, 20));
     BOOST_CHECK(MaxL.ToString() == ArrayToString(MaxArray, 32));
     BOOST_CHECK(MaxS.ToString() == ArrayToString(MaxArray, 20));
     BOOST_CHECK(OneL.ToString() != ArrayToString(ZeroArray, 32));
     BOOST_CHECK(OneS.ToString() != ArrayToString(ZeroArray, 20));
 
     // == and !=
     BOOST_CHECK(R1L != R2L && R1S != R2S);
     BOOST_CHECK(ZeroL != OneL && ZeroS != OneS);
     BOOST_CHECK(OneL != ZeroL && OneS != ZeroS);
     BOOST_CHECK(MaxL != ZeroL && MaxS != ZeroS);
 
     // String Constructor and Copy Constructor
     BOOST_CHECK(uint256S("0x" + R1L.ToString()) == R1L);
     BOOST_CHECK(uint256S("0x" + R2L.ToString()) == R2L);
     BOOST_CHECK(uint256S("0x" + ZeroL.ToString()) == ZeroL);
     BOOST_CHECK(uint256S("0x" + OneL.ToString()) == OneL);
     BOOST_CHECK(uint256S("0x" + MaxL.ToString()) == MaxL);
     BOOST_CHECK(uint256S(R1L.ToString()) == R1L);
     BOOST_CHECK(uint256S("   0x" + R1L.ToString() + "   ") == R1L);
     BOOST_CHECK(uint256S("") == ZeroL);
     BOOST_CHECK(R1L == uint256S(R1ArrayHex));
     BOOST_CHECK(uint256(R1L) == R1L);
     BOOST_CHECK(uint256(ZeroL) == ZeroL);
     BOOST_CHECK(uint256(OneL) == OneL);
 
     BOOST_CHECK(uint160S("0x" + R1S.ToString()) == R1S);
     BOOST_CHECK(uint160S("0x" + R2S.ToString()) == R2S);
     BOOST_CHECK(uint160S("0x" + ZeroS.ToString()) == ZeroS);
     BOOST_CHECK(uint160S("0x" + OneS.ToString()) == OneS);
     BOOST_CHECK(uint160S("0x" + MaxS.ToString()) == MaxS);
     BOOST_CHECK(uint160S(R1S.ToString()) == R1S);
     BOOST_CHECK(uint160S("   0x" + R1S.ToString() + "   ") == R1S);
     BOOST_CHECK(uint160S("") == ZeroS);
     BOOST_CHECK(R1S == uint160S(R1ArrayHex));
 
     BOOST_CHECK(uint160(R1S) == R1S);
     BOOST_CHECK(uint160(ZeroS) == ZeroS);
     BOOST_CHECK(uint160(OneS) == OneS);
 }
 
+static void CheckComparison(const uint256 &a, const uint256 &b) {
+    BOOST_CHECK(a < b);
+    BOOST_CHECK(b > a);
+}
+
+static void CheckComparison(const uint160 &a, const uint160 &b) {
+    BOOST_CHECK(a < b);
+    BOOST_CHECK(b > a);
+}
+
 // <= >= < >
 BOOST_AUTO_TEST_CASE(comparison) {
     uint256 LastL;
     for (int i = 255; i >= 0; --i) {
         uint256 TmpL;
         *(TmpL.begin() + (i >> 3)) |= 1 << (7 - (i & 7));
-        BOOST_CHECK(LastL < TmpL);
+        CheckComparison(LastL, TmpL);
         LastL = TmpL;
     }
 
-    BOOST_CHECK(ZeroL < R1L);
-    BOOST_CHECK(R2L < R1L);
-    BOOST_CHECK(ZeroL < OneL);
-    BOOST_CHECK(OneL < MaxL);
-    BOOST_CHECK(R1L < MaxL);
-    BOOST_CHECK(R2L < MaxL);
+    CheckComparison(ZeroL, R1L);
+    CheckComparison(R2L, R1L);
+    CheckComparison(ZeroL, OneL);
+    CheckComparison(OneL, MaxL);
+    CheckComparison(R1L, MaxL);
+    CheckComparison(R2L, MaxL);
 
     uint160 LastS;
     for (int i = 159; i >= 0; --i) {
         uint160 TmpS;
         *(TmpS.begin() + (i >> 3)) |= 1 << (7 - (i & 7));
-        BOOST_CHECK(LastS < TmpS);
+        CheckComparison(LastS, TmpS);
         LastS = TmpS;
     }
-    BOOST_CHECK(ZeroS < R1S);
-    BOOST_CHECK(R2S < R1S);
-    BOOST_CHECK(ZeroS < OneS);
-    BOOST_CHECK(OneS < MaxS);
-    BOOST_CHECK(R1S < MaxS);
-    BOOST_CHECK(R2S < MaxS);
+
+    CheckComparison(ZeroS, R1S);
+    CheckComparison(R2S, R1S);
+    CheckComparison(ZeroS, OneS);
+    CheckComparison(OneS, MaxS);
+    CheckComparison(R1S, MaxS);
+    CheckComparison(R2S, MaxS);
 }
 
 // GetHex SetHex begin() end() size() GetLow64 GetSerializeSize, Serialize,
 // Unserialize
 BOOST_AUTO_TEST_CASE(methods) {
     BOOST_CHECK(R1L.GetHex() == R1L.ToString());
     BOOST_CHECK(R2L.GetHex() == R2L.ToString());
     BOOST_CHECK(OneL.GetHex() == OneL.ToString());
     BOOST_CHECK(MaxL.GetHex() == MaxL.ToString());
     uint256 TmpL(R1L);
     BOOST_CHECK(TmpL == R1L);
     TmpL.SetHex(R2L.ToString());
     BOOST_CHECK(TmpL == R2L);
     TmpL.SetHex(ZeroL.ToString());
     BOOST_CHECK(TmpL == uint256());
 
     TmpL.SetHex(R1L.ToString());
     BOOST_CHECK(memcmp(R1L.begin(), R1Array, 32) == 0);
     BOOST_CHECK(memcmp(TmpL.begin(), R1Array, 32) == 0);
     BOOST_CHECK(memcmp(R2L.begin(), R2Array, 32) == 0);
     BOOST_CHECK(memcmp(ZeroL.begin(), ZeroArray, 32) == 0);
     BOOST_CHECK(memcmp(OneL.begin(), OneArray, 32) == 0);
     BOOST_CHECK(R1L.size() == sizeof(R1L));
     BOOST_CHECK(sizeof(R1L) == 32);
     BOOST_CHECK(R1L.size() == 32);
     BOOST_CHECK(R2L.size() == 32);
     BOOST_CHECK(ZeroL.size() == 32);
     BOOST_CHECK(MaxL.size() == 32);
     BOOST_CHECK(R1L.begin() + 32 == R1L.end());
     BOOST_CHECK(R2L.begin() + 32 == R2L.end());
     BOOST_CHECK(OneL.begin() + 32 == OneL.end());
     BOOST_CHECK(MaxL.begin() + 32 == MaxL.end());
     BOOST_CHECK(TmpL.begin() + 32 == TmpL.end());
     BOOST_CHECK(GetSerializeSize(R1L, 0, PROTOCOL_VERSION) == 32);
     BOOST_CHECK(GetSerializeSize(ZeroL, 0, PROTOCOL_VERSION) == 32);
 
     CDataStream ss(0, PROTOCOL_VERSION);
     ss << R1L;
     BOOST_CHECK(ss.str() == std::string(R1Array, R1Array + 32));
     ss >> TmpL;
     BOOST_CHECK(R1L == TmpL);
     ss.clear();
     ss << ZeroL;
     BOOST_CHECK(ss.str() == std::string(ZeroArray, ZeroArray + 32));
     ss >> TmpL;
     BOOST_CHECK(ZeroL == TmpL);
     ss.clear();
     ss << MaxL;
     BOOST_CHECK(ss.str() == std::string(MaxArray, MaxArray + 32));
     ss >> TmpL;
     BOOST_CHECK(MaxL == TmpL);
     ss.clear();
 
     BOOST_CHECK(R1S.GetHex() == R1S.ToString());
     BOOST_CHECK(R2S.GetHex() == R2S.ToString());
     BOOST_CHECK(OneS.GetHex() == OneS.ToString());
     BOOST_CHECK(MaxS.GetHex() == MaxS.ToString());
     uint160 TmpS(R1S);
     BOOST_CHECK(TmpS == R1S);
     TmpS.SetHex(R2S.ToString());
     BOOST_CHECK(TmpS == R2S);
     TmpS.SetHex(ZeroS.ToString());
     BOOST_CHECK(TmpS == uint160());
 
     TmpS.SetHex(R1S.ToString());
     BOOST_CHECK(memcmp(R1S.begin(), R1Array, 20) == 0);
     BOOST_CHECK(memcmp(TmpS.begin(), R1Array, 20) == 0);
     BOOST_CHECK(memcmp(R2S.begin(), R2Array, 20) == 0);
     BOOST_CHECK(memcmp(ZeroS.begin(), ZeroArray, 20) == 0);
     BOOST_CHECK(memcmp(OneS.begin(), OneArray, 20) == 0);
     BOOST_CHECK(R1S.size() == sizeof(R1S));
     BOOST_CHECK(sizeof(R1S) == 20);
     BOOST_CHECK(R1S.size() == 20);
     BOOST_CHECK(R2S.size() == 20);
     BOOST_CHECK(ZeroS.size() == 20);
     BOOST_CHECK(MaxS.size() == 20);
     BOOST_CHECK(R1S.begin() + 20 == R1S.end());
     BOOST_CHECK(R2S.begin() + 20 == R2S.end());
     BOOST_CHECK(OneS.begin() + 20 == OneS.end());
     BOOST_CHECK(MaxS.begin() + 20 == MaxS.end());
     BOOST_CHECK(TmpS.begin() + 20 == TmpS.end());
     BOOST_CHECK(GetSerializeSize(R1S, 0, PROTOCOL_VERSION) == 20);
     BOOST_CHECK(GetSerializeSize(ZeroS, 0, PROTOCOL_VERSION) == 20);
 
     ss << R1S;
     BOOST_CHECK(ss.str() == std::string(R1Array, R1Array + 20));
     ss >> TmpS;
     BOOST_CHECK(R1S == TmpS);
     ss.clear();
     ss << ZeroS;
     BOOST_CHECK(ss.str() == std::string(ZeroArray, ZeroArray + 20));
     ss >> TmpS;
     BOOST_CHECK(ZeroS == TmpS);
     ss.clear();
     ss << MaxS;
     BOOST_CHECK(ss.str() == std::string(MaxArray, MaxArray + 20));
     ss >> TmpS;
     BOOST_CHECK(MaxS == TmpS);
     ss.clear();
 }
 
 BOOST_AUTO_TEST_CASE(conversion) {
     BOOST_CHECK(ArithToUint256(UintToArith256(ZeroL)) == ZeroL);
     BOOST_CHECK(ArithToUint256(UintToArith256(OneL)) == OneL);
     BOOST_CHECK(ArithToUint256(UintToArith256(R1L)) == R1L);
     BOOST_CHECK(ArithToUint256(UintToArith256(R2L)) == R2L);
     BOOST_CHECK(UintToArith256(ZeroL) == 0);
     BOOST_CHECK(UintToArith256(OneL) == 1);
     BOOST_CHECK(ArithToUint256(0) == ZeroL);
     BOOST_CHECK(ArithToUint256(1) == OneL);
     BOOST_CHECK(arith_uint256(R1L.GetHex()) == UintToArith256(R1L));
     BOOST_CHECK(arith_uint256(R2L.GetHex()) == UintToArith256(R2L));
     BOOST_CHECK(R1L.GetHex() == UintToArith256(R1L).GetHex());
     BOOST_CHECK(R2L.GetHex() == UintToArith256(R2L).GetHex());
 }
 
 BOOST_AUTO_TEST_SUITE_END()
diff --git a/src/uint256.cpp b/src/uint256.cpp
index 3dd319a9c..383437968 100644
--- a/src/uint256.cpp
+++ b/src/uint256.cpp
@@ -1,73 +1,75 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2016 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "uint256.h"
 
 #include "utilstrencodings.h"
 
 #include <cstdio>
 #include <cstring>
 
 template <unsigned int BITS>
 base_blob<BITS>::base_blob(const std::vector<uint8_t> &vch) {
     assert(vch.size() == sizeof(data));
     memcpy(data, &vch[0], sizeof(data));
 }
 
 template <unsigned int BITS> std::string base_blob<BITS>::GetHex() const {
     char psz[sizeof(data) * 2 + 1];
-    for (unsigned int i = 0; i < sizeof(data); i++)
+    for (size_t i = 0; i < sizeof(data); i++) {
         sprintf(psz + i * 2, "%02x", data[sizeof(data) - i - 1]);
+    }
     return std::string(psz, psz + sizeof(data) * 2);
 }
 
 template <unsigned int BITS> void base_blob<BITS>::SetHex(const char *psz) {
     memset(data, 0, sizeof(data));
 
     // skip leading spaces
-    while (isspace(*psz))
+    while (isspace(*psz)) {
         psz++;
+    }
 
     // skip 0x
-    if (psz[0] == '0' && tolower(psz[1]) == 'x') psz += 2;
+    if (psz[0] == '0' && tolower(psz[1]) == 'x') {
+        psz += 2;
+    }
 
     // hex string to uint
     const char *pbegin = psz;
-    while (::HexDigit(*psz) != -1)
+    while (::HexDigit(*psz) != -1) {
         psz++;
+    }
+
     psz--;
     uint8_t *p1 = (uint8_t *)data;
     uint8_t *pend = p1 + WIDTH;
     while (psz >= pbegin && p1 < pend) {
         *p1 = ::HexDigit(*psz--);
         if (psz >= pbegin) {
             *p1 |= uint8_t(::HexDigit(*psz--) << 4);
             p1++;
         }
     }
 }
 
 template <unsigned int BITS>
 void base_blob<BITS>::SetHex(const std::string &str) {
     SetHex(str.c_str());
 }
 
-template <unsigned int BITS> std::string base_blob<BITS>::ToString() const {
-    return (GetHex());
-}
-
 // Explicit instantiations for base_blob<160>
 template base_blob<160>::base_blob(const std::vector<uint8_t> &);
 template std::string base_blob<160>::GetHex() const;
 template std::string base_blob<160>::ToString() const;
 template void base_blob<160>::SetHex(const char *);
 template void base_blob<160>::SetHex(const std::string &);
 
 // Explicit instantiations for base_blob<256>
 template base_blob<256>::base_blob(const std::vector<uint8_t> &);
 template std::string base_blob<256>::GetHex() const;
 template std::string base_blob<256>::ToString() const;
 template void base_blob<256>::SetHex(const char *);
 template void base_blob<256>::SetHex(const std::string &);
diff --git a/src/uint256.h b/src/uint256.h
index a7376fe78..e29c3d640 100644
--- a/src/uint256.h
+++ b/src/uint256.h
@@ -1,150 +1,158 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2016 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #ifndef BITCOIN_UINT256_H
 #define BITCOIN_UINT256_H
 
 #include "crypto/common.h"
 
 #include <cassert>
 #include <cstdint>
 #include <cstring>
 #include <stdexcept>
 #include <string>
 #include <vector>
 
 /** Template base class for fixed-sized opaque blobs. */
 template <unsigned int BITS> class base_blob {
 protected:
     enum { WIDTH = BITS / 8 };
     uint8_t data[WIDTH];
 
 public:
     base_blob() { memset(data, 0, sizeof(data)); }
 
     explicit base_blob(const std::vector<uint8_t> &vch);
 
     bool IsNull() const {
-        for (int i = 0; i < WIDTH; i++)
-            if (data[i] != 0) return false;
+        for (int i = 0; i < WIDTH; i++) {
+            if (data[i] != 0) {
+                return false;
+            }
+        }
         return true;
     }
 
     void SetNull() { memset(data, 0, sizeof(data)); }
 
     inline int Compare(const base_blob &other) const {
+        // This doesn't quite work as you'd expect because the comparison use
+        // the wrong endianess.
         return memcmp(data, other.data, sizeof(data));
     }
 
     friend inline bool operator==(const base_blob &a, const base_blob &b) {
         return a.Compare(b) == 0;
     }
     friend inline bool operator!=(const base_blob &a, const base_blob &b) {
         return a.Compare(b) != 0;
     }
     friend inline bool operator<(const base_blob &a, const base_blob &b) {
         return a.Compare(b) < 0;
     }
+    friend inline bool operator>(const base_blob &a, const base_blob &b) {
+        return a.Compare(b) > 0;
+    }
 
     std::string GetHex() const;
     void SetHex(const char *psz);
     void SetHex(const std::string &str);
-    std::string ToString() const;
+    std::string ToString() const { return GetHex(); }
 
     uint8_t *begin() { return &data[0]; }
 
     uint8_t *end() { return &data[WIDTH]; }
 
     const uint8_t *begin() const { return &data[0]; }
 
     const uint8_t *end() const { return &data[WIDTH]; }
 
     unsigned int size() const { return sizeof(data); }
 
     uint64_t GetUint64(int pos) const {
         const uint8_t *ptr = data + pos * 8;
-        return ((uint64_t)ptr[0]) | ((uint64_t)ptr[1]) << 8 |
-               ((uint64_t)ptr[2]) << 16 | ((uint64_t)ptr[3]) << 24 |
-               ((uint64_t)ptr[4]) << 32 | ((uint64_t)ptr[5]) << 40 |
-               ((uint64_t)ptr[6]) << 48 | ((uint64_t)ptr[7]) << 56;
+        return uint64_t(ptr[0]) | (uint64_t(ptr[1]) << 8) |
+               (uint64_t(ptr[2]) << 16) | (uint64_t(ptr[3]) << 24) |
+               (uint64_t(ptr[4]) << 32) | (uint64_t(ptr[5]) << 40) |
+               (uint64_t(ptr[6]) << 48) | (uint64_t(ptr[7]) << 56);
     }
 
     template <typename Stream> void Serialize(Stream &s) const {
         s.write((char *)data, sizeof(data));
     }
 
     template <typename Stream> void Unserialize(Stream &s) {
         s.read((char *)data, sizeof(data));
     }
 };
 
 /**
  * 160-bit opaque blob.
  * @note This type is called uint160 for historical reasons only. It is an
  * opaque blob of 160 bits and has no integer operations.
  */
 class uint160 : public base_blob<160> {
 public:
     uint160() {}
     uint160(const base_blob<160> &b) : base_blob<160>(b) {}
     explicit uint160(const std::vector<uint8_t> &vch) : base_blob<160>(vch) {}
 };
 
 /**
  * 256-bit opaque blob.
  * @note This type is called uint256 for historical reasons only. It is an
  * opaque blob of 256 bits and has no integer operations. Use arith_uint256 if
  * those are required.
  */
 class uint256 : public base_blob<256> {
 public:
     uint256() {}
     uint256(const base_blob<256> &b) : base_blob<256>(b) {}
     explicit uint256(const std::vector<uint8_t> &vch) : base_blob<256>(vch) {}
 
     /**
      * A cheap hash function that just returns 64 bits from the result, it can
      * be used when the contents are considered uniformly random. It is not
      * appropriate when the value can easily be influenced from outside as e.g.
      * a network adversary could provide values to trigger worst-case behavior.
      */
     uint64_t GetCheapHash() const { return ReadLE64(data); }
 };
 
 /**
  * uint256 from const char *.
  * This is a separate function because the constructor uint256(const char*) can
  * result in dangerously catching uint256(0).
  */
 inline uint256 uint256S(const char *str) {
     uint256 rv;
     rv.SetHex(str);
     return rv;
 }
 
 /**
  * uint256 from std::string.
  * This is a separate function because the constructor uint256(const std::string
  * &str) can result in dangerously catching uint256(0) via std::string(const
  * char*).
  */
 inline uint256 uint256S(const std::string &str) {
     uint256 rv;
     rv.SetHex(str);
     return rv;
 }
 
 inline uint160 uint160S(const char *str) {
     uint160 rv;
     rv.SetHex(str);
     return rv;
 }
 inline uint160 uint160S(const std::string &str) {
     uint160 rv;
     rv.SetHex(str);
     return rv;
 }
 
 #endif // BITCOIN_UINT256_H