diff --git a/src/addrman.h b/src/addrman.h
index 7753f1822..5c77a4fdb 100644
--- a/src/addrman.h
+++ b/src/addrman.h
@@ -54,7 +54,7 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         READWRITE(*(CAddress*)this);
         READWRITE(source);
         READWRITE(nLastSuccess);
@@ -279,7 +279,7 @@ public:
      * very little in common.
      */
     template<typename Stream>
-    void Serialize(Stream &s, int nType, int nVersionDummy) const
+    void Serialize(Stream &s) const
     {
         LOCK(cs);
 
@@ -329,7 +329,7 @@ public:
     }
 
     template<typename Stream>
-    void Unserialize(Stream& s, int nType, int nVersionDummy)
+    void Unserialize(Stream& s)
     {
         LOCK(cs);
 
diff --git a/src/amount.h b/src/amount.h
index 90e6b5aa8..3d7eefc58 100644
--- a/src/amount.h
+++ b/src/amount.h
@@ -56,7 +56,7 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         READWRITE(nSatoshisPerK);
     }
 };
diff --git a/src/bloom.h b/src/bloom.h
index a4dba8cb4..df5c30b1e 100644
--- a/src/bloom.h
+++ b/src/bloom.h
@@ -73,7 +73,7 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         READWRITE(vData);
         READWRITE(nHashFuncs);
         READWRITE(nTweak);
diff --git a/src/chain.h b/src/chain.h
index 937e20bda..793ef4f03 100644
--- a/src/chain.h
+++ b/src/chain.h
@@ -26,7 +26,7 @@ struct CDiskBlockPos
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         READWRITE(VARINT(nFile));
         READWRITE(VARINT(nPos));
     }
@@ -340,8 +340,9 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
-        if (!(nType & SER_GETHASH))
+    inline void SerializationOp(Stream& s, Operation ser_action) {
+        int nVersion = s.GetVersion();
+        if (!(s.GetType() & SER_GETHASH))
             READWRITE(VARINT(nVersion));
 
         READWRITE(VARINT(nHeight));
diff --git a/src/coins.h b/src/coins.h
index 52b724193..4e1cac438 100644
--- a/src/coins.h
+++ b/src/coins.h
@@ -154,7 +154,7 @@ public:
     }
 
     template<typename Stream>
-    void Serialize(Stream &s, int nType, int nVersion) const {
+    void Serialize(Stream &s) const {
         unsigned int nMaskSize = 0, nMaskCode = 0;
         CalcMaskSize(nMaskSize, nMaskCode);
         bool fFirst = vout.size() > 0 && !vout[0].IsNull();
@@ -162,33 +162,33 @@ public:
         assert(fFirst || fSecond || nMaskCode);
         unsigned int nCode = 8*(nMaskCode - (fFirst || fSecond ? 0 : 1)) + (fCoinBase ? 1 : 0) + (fFirst ? 2 : 0) + (fSecond ? 4 : 0);
         // version
-        ::Serialize(s, VARINT(this->nVersion), nType, nVersion);
+        ::Serialize(s, VARINT(this->nVersion));
         // header code
-        ::Serialize(s, VARINT(nCode), nType, nVersion);
+        ::Serialize(s, VARINT(nCode));
         // spentness bitmask
         for (unsigned int b = 0; b<nMaskSize; b++) {
             unsigned char chAvail = 0;
             for (unsigned int i = 0; i < 8 && 2+b*8+i < vout.size(); i++)
                 if (!vout[2+b*8+i].IsNull())
                     chAvail |= (1 << i);
-            ::Serialize(s, chAvail, nType, nVersion);
+            ::Serialize(s, chAvail);
         }
         // txouts themself
         for (unsigned int i = 0; i < vout.size(); i++) {
             if (!vout[i].IsNull())
-                ::Serialize(s, CTxOutCompressor(REF(vout[i])), nType, nVersion);
+                ::Serialize(s, CTxOutCompressor(REF(vout[i])));
         }
         // coinbase height
-        ::Serialize(s, VARINT(nHeight), nType, nVersion);
+        ::Serialize(s, VARINT(nHeight));
     }
 
     template<typename Stream>
-    void Unserialize(Stream &s, int nType, int nVersion) {
+    void Unserialize(Stream &s) {
         unsigned int nCode = 0;
         // version
-        ::Unserialize(s, VARINT(this->nVersion), nType, nVersion);
+        ::Unserialize(s, VARINT(this->nVersion));
         // header code
-        ::Unserialize(s, VARINT(nCode), nType, nVersion);
+        ::Unserialize(s, VARINT(nCode));
         fCoinBase = nCode & 1;
         std::vector<bool> vAvail(2, false);
         vAvail[0] = (nCode & 2) != 0;
@@ -197,7 +197,7 @@ public:
         // spentness bitmask
         while (nMaskCode > 0) {
             unsigned char chAvail = 0;
-            ::Unserialize(s, chAvail, nType, nVersion);
+            ::Unserialize(s, chAvail);
             for (unsigned int p = 0; p < 8; p++) {
                 bool f = (chAvail & (1 << p)) != 0;
                 vAvail.push_back(f);
@@ -209,10 +209,10 @@ public:
         vout.assign(vAvail.size(), CTxOut());
         for (unsigned int i = 0; i < vAvail.size(); i++) {
             if (vAvail[i])
-                ::Unserialize(s, REF(CTxOutCompressor(vout[i])), nType, nVersion);
+                ::Unserialize(s, REF(CTxOutCompressor(vout[i])));
         }
         // coinbase height
-        ::Unserialize(s, VARINT(nHeight), nType, nVersion);
+        ::Unserialize(s, VARINT(nHeight));
         Cleanup();
     }
 
diff --git a/src/compressor.h b/src/compressor.h
index 90749499d..961365d26 100644
--- a/src/compressor.h
+++ b/src/compressor.h
@@ -56,7 +56,7 @@ public:
     CScriptCompressor(CScript &scriptIn) : script(scriptIn) { }
 
     template<typename Stream>
-    void Serialize(Stream &s, int nType, int nVersion) const {
+    void Serialize(Stream &s) const {
         std::vector<unsigned char> compr;
         if (Compress(compr)) {
             s << CFlatData(compr);
@@ -68,7 +68,7 @@ public:
     }
 
     template<typename Stream>
-    void Unserialize(Stream &s, int nType, int nVersion) {
+    void Unserialize(Stream &s) {
         unsigned int nSize = 0;
         s >> VARINT(nSize);
         if (nSize < nSpecialScripts) {
@@ -104,7 +104,7 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         if (!ser_action.ForRead()) {
             uint64_t nVal = CompressAmount(txout.nValue);
             READWRITE(VARINT(nVal));
diff --git a/src/hash.h b/src/hash.h
index 1d28d6bdf..8276c9184 100644
--- a/src/hash.h
+++ b/src/hash.h
@@ -140,6 +140,9 @@ public:
 
     CHashWriter(int nTypeIn, int nVersionIn) : nType(nTypeIn), nVersion(nVersionIn) {}
 
+    int GetType() const { return nType; }
+    int GetVersion() const { return nVersion; }
+
     void write(const char *pch, size_t size) {
         ctx.Write((const unsigned char*)pch, size);
     }
@@ -154,7 +157,7 @@ public:
     template<typename T>
     CHashWriter& operator<<(const T& obj) {
         // Serialize to this stream
-        ::Serialize(*this, obj, nType, nVersion);
+        ::Serialize(*this, obj);
         return (*this);
     }
 };
diff --git a/src/key.h b/src/key.h
index d07bac91b..8d64151e3 100644
--- a/src/key.h
+++ b/src/key.h
@@ -176,7 +176,7 @@ struct CExtKey {
     CExtPubKey Neuter() const;
     void SetMaster(const unsigned char* seed, unsigned int nSeedLen);
     template <typename Stream>
-    void Serialize(Stream& s, int nType, int nVersion) const
+    void Serialize(Stream& s) const
     {
         unsigned int len = BIP32_EXTKEY_SIZE;
         ::WriteCompactSize(s, len);
@@ -185,7 +185,7 @@ struct CExtKey {
         s.write((const char *)&code[0], len);
     }
     template <typename Stream>
-    void Unserialize(Stream& s, int nType, int nVersion)
+    void Unserialize(Stream& s)
     {
         unsigned int len = ::ReadCompactSize(s);
         unsigned char code[BIP32_EXTKEY_SIZE];
diff --git a/src/main.h b/src/main.h
index 2a3b4175a..580de352a 100644
--- a/src/main.h
+++ b/src/main.h
@@ -273,7 +273,7 @@ struct CDiskTxPos : public CDiskBlockPos
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         READWRITE(*(CDiskBlockPos*)this);
         READWRITE(VARINT(nTxOffset));
     }
@@ -493,7 +493,7 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         READWRITE(VARINT(nBlocks));
         READWRITE(VARINT(nSize));
         READWRITE(VARINT(nUndoSize));
diff --git a/src/merkleblock.h b/src/merkleblock.h
index 0181723af..97223ed92 100644
--- a/src/merkleblock.h
+++ b/src/merkleblock.h
@@ -85,7 +85,7 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         READWRITE(nTransactions);
         READWRITE(vHash);
         std::vector<unsigned char> vBytes;
@@ -147,7 +147,7 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         READWRITE(header);
         READWRITE(txn);
     }
diff --git a/src/netbase.h b/src/netbase.h
index 8f02fa025..a50efc428 100644
--- a/src/netbase.h
+++ b/src/netbase.h
@@ -97,7 +97,7 @@ class CNetAddr
         ADD_SERIALIZE_METHODS;
 
         template <typename Stream, typename Operation>
-        inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+        inline void SerializationOp(Stream& s, Operation ser_action) {
             READWRITE(FLATDATA(ip));
         }
 
@@ -162,7 +162,7 @@ class CService : public CNetAddr
         ADD_SERIALIZE_METHODS;
 
         template <typename Stream, typename Operation>
-        inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+        inline void SerializationOp(Stream& s, Operation ser_action) {
             READWRITE(FLATDATA(ip));
             unsigned short portN = htons(port);
             READWRITE(FLATDATA(portN));
diff --git a/src/primitives/block.h b/src/primitives/block.h
index 6b3f13a86..7fe1a3588 100644
--- a/src/primitives/block.h
+++ b/src/primitives/block.h
@@ -40,7 +40,7 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         READWRITE(this->nVersion);
         nVersion = this->nVersion;
         READWRITE(hashPrevBlock);
@@ -101,7 +101,7 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         READWRITE(*(CBlockHeader*)this);
         READWRITE(vtx);
     }
@@ -185,8 +185,9 @@ struct CBlockLocator
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
-        if (!(nType & SER_GETHASH))
+    inline void SerializationOp(Stream& s, Operation ser_action) {
+        int nVersion = s.GetVersion();
+        if (!(s.GetType() & SER_GETHASH))
             READWRITE(nVersion);
         READWRITE(vHave);
     }
diff --git a/src/primitives/transaction.h b/src/primitives/transaction.h
index 5e4f4a526..60ea11239 100644
--- a/src/primitives/transaction.h
+++ b/src/primitives/transaction.h
@@ -157,7 +157,7 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         READWRITE(hash);
         READWRITE(n);
     }
@@ -205,7 +205,7 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         READWRITE(prevout);
         READWRITE(*(CScriptBase*)(&scriptSig));
         READWRITE(nSequence);
@@ -250,7 +250,7 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         READWRITE(nValue);
         READWRITE(*(CScriptBase*)(&scriptPubKey));
     }
@@ -372,7 +372,7 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         if (ser_action.ForRead()) {
             // When deserializing, unpack the 4 byte header to extract fOverwintered and nVersion.
             uint32_t header;
@@ -482,7 +482,7 @@ struct CMutableTransaction
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         if (ser_action.ForRead()) {
             // When deserializing, unpack the 4 byte header to extract fOverwintered and nVersion.
             uint32_t header;
diff --git a/src/protocol.h b/src/protocol.h
index 5eafb7df6..d908191cc 100644
--- a/src/protocol.h
+++ b/src/protocol.h
@@ -40,7 +40,7 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion)
+    inline void SerializationOp(Stream& s, Operation ser_action)
     {
         READWRITE(FLATDATA(pchMessageStart));
         READWRITE(FLATDATA(pchCommand));
@@ -97,14 +97,15 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion)
+    inline void SerializationOp(Stream& s, Operation ser_action)
     {
         if (ser_action.ForRead())
             Init();
-        if (nType & SER_DISK)
+        int nVersion = s.GetVersion();
+        if (s.GetType() & SER_DISK)
             READWRITE(nVersion);
-        if ((nType & SER_DISK) ||
-            (nVersion >= CADDR_TIME_VERSION && !(nType & SER_GETHASH)))
+        if ((s.GetType() & SER_DISK) ||
+            (nVersion >= CADDR_TIME_VERSION && !(s.GetType() & SER_GETHASH)))
             READWRITE(nTime);
         READWRITE(nServices);
         READWRITE(*(CService*)this);
@@ -129,7 +130,7 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion)
+    inline void SerializationOp(Stream& s, Operation ser_action)
     {
         READWRITE(type);
         READWRITE(hash);
diff --git a/src/pubkey.h b/src/pubkey.h
index 3589cbd16..9521bd2c0 100644
--- a/src/pubkey.h
+++ b/src/pubkey.h
@@ -124,14 +124,14 @@ public:
 
     //! Implement serialization, as if this was a byte vector.
     template <typename Stream>
-    void Serialize(Stream& s, int nType, int nVersion) const
+    void Serialize(Stream& s) const
     {
         unsigned int len = size();
         ::WriteCompactSize(s, len);
         s.write((char*)vch, len);
     }
     template <typename Stream>
-    void Unserialize(Stream& s, int nType, int nVersion)
+    void Unserialize(Stream& s)
     {
         unsigned int len = ::ReadCompactSize(s);
         if (len <= PUBLIC_KEY_SIZE) {
@@ -215,7 +215,7 @@ struct CExtPubKey {
     bool Derive(CExtPubKey& out, unsigned int nChild) const;
 
     template <typename Stream>
-    void Serialize(Stream& s, int nType, int nVersion) const
+    void Serialize(Stream& s) const
     {
         unsigned int len = BIP32_EXTKEY_SIZE;
         ::WriteCompactSize(s, len);
@@ -224,7 +224,7 @@ struct CExtPubKey {
         s.write((const char *)&code[0], len);
     }
     template <typename Stream>
-    void Unserialize(Stream& s, int nType, int nVersion)
+    void Unserialize(Stream& s)
     {
         unsigned int len = ::ReadCompactSize(s);
         unsigned char code[BIP32_EXTKEY_SIZE];
diff --git a/src/rest.cpp b/src/rest.cpp
index 813850b4a..c0d8f5320 100644
--- a/src/rest.cpp
+++ b/src/rest.cpp
@@ -48,7 +48,7 @@ struct CCoin {
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion)
+    inline void SerializationOp(Stream& s, Operation ser_action)
     {
         READWRITE(nTxVer);
         READWRITE(nHeight);
diff --git a/src/script/interpreter.cpp b/src/script/interpreter.cpp
index 8e46d96b8..f262faef9 100644
--- a/src/script/interpreter.cpp
+++ b/src/script/interpreter.cpp
@@ -981,7 +981,7 @@ public:
 
     /** Serialize the passed scriptCode */
     template<typename S>
-    void SerializeScriptCode(S &s, int nType, int nVersion) const {
+    void SerializeScriptCode(S &s) const {
         auto size = scriptCode.size();
         ::WriteCompactSize(s, size);
         s.write((char*)&scriptCode.begin()[0], size);
@@ -989,54 +989,54 @@ public:
 
     /** Serialize an input of txTo */
     template<typename S>
-    void SerializeInput(S &s, unsigned int nInput, int nType, int nVersion) const {
+    void SerializeInput(S &s, unsigned int nInput) const {
         // In case of SIGHASH_ANYONECANPAY, only the input being signed is serialized
         if (fAnyoneCanPay)
             nInput = nIn;
         // Serialize the prevout
-        ::Serialize(s, txTo.vin[nInput].prevout, nType, nVersion);
+        ::Serialize(s, txTo.vin[nInput].prevout);
         // Serialize the script
         assert(nInput != NOT_AN_INPUT);
         if (nInput != nIn)
             // Blank out other inputs' signatures
-            ::Serialize(s, CScriptBase(), nType, nVersion);
+            ::Serialize(s, CScriptBase());
         else
-            SerializeScriptCode(s, nType, nVersion);
+            SerializeScriptCode(s);
         // Serialize the nSequence
         if (nInput != nIn && (fHashSingle || fHashNone))
             // let the others update at will
-            ::Serialize(s, (int)0, nType, nVersion);
+            ::Serialize(s, (int)0);
         else
-            ::Serialize(s, txTo.vin[nInput].nSequence, nType, nVersion);
+            ::Serialize(s, txTo.vin[nInput].nSequence);
     }
 
     /** Serialize an output of txTo */
     template<typename S>
-    void SerializeOutput(S &s, unsigned int nOutput, int nType, int nVersion) const {
+    void SerializeOutput(S &s, unsigned int nOutput) const {
         if (fHashSingle && nOutput != nIn)
             // Do not lock-in the txout payee at other indices as txin
-            ::Serialize(s, CTxOut(), nType, nVersion);
+            ::Serialize(s, CTxOut());
         else
-            ::Serialize(s, txTo.vout[nOutput], nType, nVersion);
+            ::Serialize(s, txTo.vout[nOutput]);
     }
 
     /** Serialize txTo */
     template<typename S>
-    void Serialize(S &s, int nType, int nVersion) const {
+    void Serialize(S &s) const {
         // Serialize nVersion
-        ::Serialize(s, txTo.nVersion, nType, nVersion);
+        ::Serialize(s, txTo.nVersion);
         // Serialize vin
         unsigned int nInputs = fAnyoneCanPay ? 1 : txTo.vin.size();
         ::WriteCompactSize(s, nInputs);
         for (unsigned int nInput = 0; nInput < nInputs; nInput++)
-             SerializeInput(s, nInput, nType, nVersion);
+             SerializeInput(s, nInput);
         // Serialize vout
         unsigned int nOutputs = fHashNone ? 0 : (fHashSingle ? nIn+1 : txTo.vout.size());
         ::WriteCompactSize(s, nOutputs);
         for (unsigned int nOutput = 0; nOutput < nOutputs; nOutput++)
-             SerializeOutput(s, nOutput, nType, nVersion);
+             SerializeOutput(s, nOutput);
         // Serialize nLockTime
-        ::Serialize(s, txTo.nLockTime, nType, nVersion);
+        ::Serialize(s, txTo.nLockTime);
 
         // Serialize vjoinsplit
         if (txTo.nVersion >= 2) {
diff --git a/src/script/zcashconsensus.cpp b/src/script/zcashconsensus.cpp
index daf445d34..50d732fff 100644
--- a/src/script/zcashconsensus.cpp
+++ b/src/script/zcashconsensus.cpp
@@ -43,10 +43,12 @@ public:
     template<typename T>
     TxInputStream& operator>>(T& obj)
     {
-        ::Unserialize(*this, obj, m_type, m_version);
+        ::Unserialize(*this, obj);
         return *this;
     }
 
+    int GetVersion() const { return m_version; }
+    int GetType() const { return m_type; }
 private:
     const int m_type;
     const int m_version;
diff --git a/src/serialize.h b/src/serialize.h
index 124169c67..0cc5216fd 100644
--- a/src/serialize.h
+++ b/src/serialize.h
@@ -164,8 +164,8 @@ enum
     SER_GETHASH         = (1 << 2),
 };
 
-#define READWRITE(obj)      (::SerReadWrite(s, (obj), nType, nVersion, ser_action))
-#define READWRITEMANY(...)      (::SerReadWriteMany(s, nType, nVersion, ser_action, __VA_ARGS__))
+#define READWRITE(obj)      (::SerReadWrite(s, (obj), ser_action))
+#define READWRITEMANY(...)      (::SerReadWriteMany(s, ser_action, __VA_ARGS__))
 
 /** 
  * Implement three methods for serializable objects. These are actually wrappers over
@@ -173,45 +173,42 @@ enum
  * code. Adding "ADD_SERIALIZE_METHODS" in the body of the class causes these wrappers to be
  * added as members. 
  */
-#define ADD_SERIALIZE_METHODS                                                          \
-    template<typename Stream>                                                        \
-    void Serialize(Stream& s, int nType, int nVersion) const {                       \
-        NCONST_PTR(this)->SerializationOp(s, CSerActionSerialize(), nType, nVersion);\
-    }                                                                                \
-    template<typename Stream>                                                        \
-    void Unserialize(Stream& s, int nType, int nVersion) {                           \
-        SerializationOp(s, CSerActionUnserialize(), nType, nVersion);                \
+#define ADD_SERIALIZE_METHODS                                         \
+    template<typename Stream>                                         \
+    void Serialize(Stream& s) const {                                 \
+        NCONST_PTR(this)->SerializationOp(s, CSerActionSerialize());  \
+    }                                                                 \
+    template<typename Stream>                                         \
+    void Unserialize(Stream& s) {                                     \
+        SerializationOp(s, CSerActionUnserialize());                  \
     }
 
-/*
- * Basic Types
- */
-template<typename Stream> inline void Serialize(Stream& s, char a,         int, int=0) { ser_writedata8(s, a); } // TODO Get rid of bare char
-template<typename Stream> inline void Serialize(Stream& s, int8_t a,       int, int=0) { ser_writedata8(s, a); }
-template<typename Stream> inline void Serialize(Stream& s, uint8_t a,      int, int=0) { ser_writedata8(s, a); }
-template<typename Stream> inline void Serialize(Stream& s, int16_t a,      int, int=0) { ser_writedata16(s, a); }
-template<typename Stream> inline void Serialize(Stream& s, uint16_t a,     int, int=0) { ser_writedata16(s, a); }
-template<typename Stream> inline void Serialize(Stream& s, int32_t a,      int, int=0) { ser_writedata32(s, a); }
-template<typename Stream> inline void Serialize(Stream& s, uint32_t a,     int, int=0) { ser_writedata32(s, a); }
-template<typename Stream> inline void Serialize(Stream& s, int64_t a,      int, int=0) { ser_writedata64(s, a); }
-template<typename Stream> inline void Serialize(Stream& s, uint64_t a,     int, int=0) { ser_writedata64(s, a); }
-template<typename Stream> inline void Serialize(Stream& s, float a,        int, int=0) { ser_writedata32(s, ser_float_to_uint32(a)); }
-template<typename Stream> inline void Serialize(Stream& s, double a,       int, int=0) { ser_writedata64(s, ser_double_to_uint64(a)); }
+template<typename Stream> inline void Serialize(Stream& s, char a    ) { ser_writedata8(s, a); } // TODO Get rid of bare char
+template<typename Stream> inline void Serialize(Stream& s, int8_t a  ) { ser_writedata8(s, a); }
+template<typename Stream> inline void Serialize(Stream& s, uint8_t a ) { ser_writedata8(s, a); }
+template<typename Stream> inline void Serialize(Stream& s, int16_t a ) { ser_writedata16(s, a); }
+template<typename Stream> inline void Serialize(Stream& s, uint16_t a) { ser_writedata16(s, a); }
+template<typename Stream> inline void Serialize(Stream& s, int32_t a ) { ser_writedata32(s, a); }
+template<typename Stream> inline void Serialize(Stream& s, uint32_t a) { ser_writedata32(s, a); }
+template<typename Stream> inline void Serialize(Stream& s, int64_t a ) { ser_writedata64(s, a); }
+template<typename Stream> inline void Serialize(Stream& s, uint64_t a) { ser_writedata64(s, a); }
+template<typename Stream> inline void Serialize(Stream& s, float a   ) { ser_writedata32(s, ser_float_to_uint32(a)); }
+template<typename Stream> inline void Serialize(Stream& s, double a  ) { ser_writedata64(s, ser_double_to_uint64(a)); }
 
-template<typename Stream> inline void Unserialize(Stream& s, char& a,      int, int=0) { a = ser_readdata8(s); } // TODO Get rid of bare char
-template<typename Stream> inline void Unserialize(Stream& s, int8_t& a,    int, int=0) { a = ser_readdata8(s); }
-template<typename Stream> inline void Unserialize(Stream& s, uint8_t& a,   int, int=0) { a = ser_readdata8(s); }
-template<typename Stream> inline void Unserialize(Stream& s, int16_t& a,   int, int=0) { a = ser_readdata16(s); }
-template<typename Stream> inline void Unserialize(Stream& s, uint16_t& a,  int, int=0) { a = ser_readdata16(s); }
-template<typename Stream> inline void Unserialize(Stream& s, int32_t& a,   int, int=0) { a = ser_readdata32(s); }
-template<typename Stream> inline void Unserialize(Stream& s, uint32_t& a,  int, int=0) { a = ser_readdata32(s); }
-template<typename Stream> inline void Unserialize(Stream& s, int64_t& a,   int, int=0) { a = ser_readdata64(s); }
-template<typename Stream> inline void Unserialize(Stream& s, uint64_t& a,  int, int=0) { a = ser_readdata64(s); }
-template<typename Stream> inline void Unserialize(Stream& s, float& a,     int, int=0) { a = ser_uint32_to_float(ser_readdata32(s)); }
-template<typename Stream> inline void Unserialize(Stream& s, double& a,    int, int=0) { a = ser_uint64_to_double(ser_readdata64(s)); }
+template<typename Stream> inline void Unserialize(Stream& s, char& a    ) { a = ser_readdata8(s); } // TODO Get rid of bare char
+template<typename Stream> inline void Unserialize(Stream& s, int8_t& a  ) { a = ser_readdata8(s); }
+template<typename Stream> inline void Unserialize(Stream& s, uint8_t& a ) { a = ser_readdata8(s); }
+template<typename Stream> inline void Unserialize(Stream& s, int16_t& a ) { a = ser_readdata16(s); }
+template<typename Stream> inline void Unserialize(Stream& s, uint16_t& a) { a = ser_readdata16(s); }
+template<typename Stream> inline void Unserialize(Stream& s, int32_t& a ) { a = ser_readdata32(s); }
+template<typename Stream> inline void Unserialize(Stream& s, uint32_t& a) { a = ser_readdata32(s); }
+template<typename Stream> inline void Unserialize(Stream& s, int64_t& a ) { a = ser_readdata64(s); }
+template<typename Stream> inline void Unserialize(Stream& s, uint64_t& a) { a = ser_readdata64(s); }
+template<typename Stream> inline void Unserialize(Stream& s, float& a   ) { a = ser_uint32_to_float(ser_readdata32(s)); }
+template<typename Stream> inline void Unserialize(Stream& s, double& a  ) { a = ser_uint64_to_double(ser_readdata64(s)); }
 
-template<typename Stream> inline void Serialize(Stream& s, bool a, int, int=0)    { char f=a; ser_writedata8(s, f); }
-template<typename Stream> inline void Unserialize(Stream& s, bool& a, int, int=0) { char f=ser_readdata8(s); a=f; }
+template<typename Stream> inline void Serialize(Stream& s, bool a)    { char f=a; ser_writedata8(s, f); }
+template<typename Stream> inline void Unserialize(Stream& s, bool& a) { char f=ser_readdata8(s); a=f; }
 
 
 
@@ -390,13 +387,13 @@ public:
     const char* end() const { return pend; }
 
     template<typename Stream>
-    void Serialize(Stream& s, int, int=0) const
+    void Serialize(Stream& s) const
     {
         s.write(pbegin, pend - pbegin);
     }
 
     template<typename Stream>
-    void Unserialize(Stream& s, int, int=0)
+    void Unserialize(Stream& s)
     {
         s.read(pbegin, pend - pbegin);
     }
@@ -411,12 +408,12 @@ public:
     CVarInt(I& nIn) : n(nIn) { }
 
     template<typename Stream>
-    void Serialize(Stream &s, int, int) const {
+    void Serialize(Stream &s) const {
         WriteVarInt<Stream,I>(s, n);
     }
 
     template<typename Stream>
-    void Unserialize(Stream& s, int, int) {
+    void Unserialize(Stream& s) {
         n = ReadVarInt<Stream,I>(s);
     }
 };
@@ -429,12 +426,12 @@ public:
     CCompactSize(uint64_t& nIn) : n(nIn) { }
 
     template<typename Stream>
-    void Serialize(Stream &s, int, int) const {
+    void Serialize(Stream &s) const {
         WriteCompactSize<Stream>(s, n);
     }
 
     template<typename Stream>
-    void Unserialize(Stream& s, int, int) {
+    void Unserialize(Stream& s) {
         n = ReadCompactSize<Stream>(s);
     }
 };
@@ -448,7 +445,7 @@ public:
     LimitedString(std::string& string) : string(string) {}
 
     template<typename Stream>
-    void Unserialize(Stream& s, int, int=0)
+    void Unserialize(Stream& s)
     {
         size_t size = ReadCompactSize(s);
         if (size > Limit) {
@@ -460,7 +457,7 @@ public:
     }
 
     template<typename Stream>
-    void Serialize(Stream& s, int, int=0) const
+    void Serialize(Stream& s) const
     {
         WriteCompactSize(s, string.size());
         if (!string.empty())
@@ -478,30 +475,30 @@ CVarInt<I> WrapVarInt(I& n) { return CVarInt<I>(n); }
 /**
  *  string
  */
-template<typename Stream, typename C> void Serialize(Stream& os, const std::basic_string<C>& str, int, int=0);
-template<typename Stream, typename C> void Unserialize(Stream& is, std::basic_string<C>& str, int, int=0);
+template<typename Stream, typename C> void Serialize(Stream& os, const std::basic_string<C>& str);
+template<typename Stream, typename C> void Unserialize(Stream& is, std::basic_string<C>& str);
 
 /**
  * prevector
  * prevectors of unsigned char are a special case and are intended to be serialized as a single opaque blob.
  */
-template<typename Stream, unsigned int N, typename T> void Serialize_impl(Stream& os, const prevector<N, T>& v, int nType, int nVersion, const unsigned char&);
-template<typename Stream, unsigned int N, typename T, typename V> void Serialize_impl(Stream& os, const prevector<N, T>& v, int nType, int nVersion, const V&);
-template<typename Stream, unsigned int N, typename T> inline void Serialize(Stream& os, const prevector<N, T>& v, int nType, int nVersion);
-template<typename Stream, unsigned int N, typename T> void Unserialize_impl(Stream& is, prevector<N, T>& v, int nType, int nVersion, const unsigned char&);
-template<typename Stream, unsigned int N, typename T, typename V> void Unserialize_impl(Stream& is, prevector<N, T>& v, int nType, int nVersion, const V&);
-template<typename Stream, unsigned int N, typename T> inline void Unserialize(Stream& is, prevector<N, T>& v, int nType, int nVersion);
+template<typename Stream, unsigned int N, typename T> void Serialize_impl(Stream& os, const prevector<N, T>& v, const unsigned char&);
+template<typename Stream, unsigned int N, typename T, typename V> void Serialize_impl(Stream& os, const prevector<N, T>& v, const V&);
+template<typename Stream, unsigned int N, typename T> inline void Serialize(Stream& os, const prevector<N, T>& v);
+template<typename Stream, unsigned int N, typename T> void Unserialize_impl(Stream& is, prevector<N, T>& v, const unsigned char&);
+template<typename Stream, unsigned int N, typename T, typename V> void Unserialize_impl(Stream& is, prevector<N, T>& v, const V&);
+template<typename Stream, unsigned int N, typename T> inline void Unserialize(Stream& is, prevector<N, T>& v);
 
 /**
  * vector
  * vectors of unsigned char are a special case and are intended to be serialized as a single opaque blob.
  */
-template<typename Stream, typename T, typename A> void Serialize_impl(Stream& os, const std::vector<T, A>& v, int nType, int nVersion, const unsigned char&);
-template<typename Stream, typename T, typename A, typename V> void Serialize_impl(Stream& os, const std::vector<T, A>& v, int nType, int nVersion, const V&);
-template<typename Stream, typename T, typename A> inline void Serialize(Stream& os, const std::vector<T, A>& v, int nType, int nVersion);
-template<typename Stream, typename T, typename A> void Unserialize_impl(Stream& is, std::vector<T, A>& v, int nType, int nVersion, const unsigned char&);
-template<typename Stream, typename T, typename A, typename V> void Unserialize_impl(Stream& is, std::vector<T, A>& v, int nType, int nVersion, const V&);
-template<typename Stream, typename T, typename A> inline void Unserialize(Stream& is, std::vector<T, A>& v, int nType, int nVersion);
+template<typename Stream, typename T, typename A> void Serialize_impl(Stream& os, const std::vector<T, A>& v, const unsigned char&);
+template<typename Stream, typename T, typename A, typename V> void Serialize_impl(Stream& os, const std::vector<T, A>& v, const V&);
+template<typename Stream, typename T, typename A> inline void Serialize(Stream& os, const std::vector<T, A>& v);
+template<typename Stream, typename T, typename A> void Unserialize_impl(Stream& is, std::vector<T, A>& v, const unsigned char&);
+template<typename Stream, typename T, typename A, typename V> void Unserialize_impl(Stream& is, std::vector<T, A>& v, const V&);
+template<typename Stream, typename T, typename A> inline void Unserialize(Stream& is, std::vector<T, A>& v);
 
 /**
  * optional
@@ -518,20 +515,20 @@ template<typename Stream, typename T, std::size_t N> void Unserialize(Stream& is
 /**
  * pair
  */
-template<typename Stream, typename K, typename T> void Serialize(Stream& os, const std::pair<K, T>& item, int nType, int nVersion);
-template<typename Stream, typename K, typename T> void Unserialize(Stream& is, std::pair<K, T>& item, int nType, int nVersion);
+template<typename Stream, typename K, typename T> void Serialize(Stream& os, const std::pair<K, T>& item);
+template<typename Stream, typename K, typename T> void Unserialize(Stream& is, std::pair<K, T>& item);
 
 /**
  * map
  */
-template<typename Stream, typename K, typename T, typename Pred, typename A> void Serialize(Stream& os, const std::map<K, T, Pred, A>& m, int nType, int nVersion);
-template<typename Stream, typename K, typename T, typename Pred, typename A> void Unserialize(Stream& is, std::map<K, T, Pred, A>& m, int nType, int nVersion);
+template<typename Stream, typename K, typename T, typename Pred, typename A> void Serialize(Stream& os, const std::map<K, T, Pred, A>& m);
+template<typename Stream, typename K, typename T, typename Pred, typename A> void Unserialize(Stream& is, std::map<K, T, Pred, A>& m);
 
 /**
  * set
  */
-template<typename Stream, typename K, typename Pred, typename A> void Serialize(Stream& os, const std::set<K, Pred, A>& m, int nType, int nVersion);
-template<typename Stream, typename K, typename Pred, typename A> void Unserialize(Stream& is, std::set<K, Pred, A>& m, int nType, int nVersion);
+template<typename Stream, typename K, typename Pred, typename A> void Serialize(Stream& os, const std::set<K, Pred, A>& m);
+template<typename Stream, typename K, typename Pred, typename A> void Unserialize(Stream& is, std::set<K, Pred, A>& m);
 
 /**
  * list
@@ -545,20 +542,17 @@ template<typename Stream, typename T, typename A> void Unserialize(Stream& is, s
 
 /**
  * If none of the specialized versions above matched, default to calling member function.
- * "int nType" is changed to "long nType" to keep from getting an ambiguous overload error.
- * The compiler will only cast int to long if none of the other templates matched.
- * Thanks to Boost serialization for this idea.
  */
 template<typename Stream, typename T>
-inline void Serialize(Stream& os, const T& a, long nType, int nVersion)
+inline void Serialize(Stream& os, const T& a)
 {
-    a.Serialize(os, (int)nType, nVersion);
+    a.Serialize(os);
 }
 
 template<typename Stream, typename T>
-inline void Unserialize(Stream& is, T& a, long nType, int nVersion)
+inline void Unserialize(Stream& is, T& a)
 {
-    a.Unserialize(is, (int)nType, nVersion);
+    a.Unserialize(is);
 }
 
 
@@ -569,7 +563,7 @@ inline void Unserialize(Stream& is, T& a, long nType, int nVersion)
  * string
  */
 template<typename Stream, typename C>
-void Serialize(Stream& os, const std::basic_string<C>& str, int, int)
+void Serialize(Stream& os, const std::basic_string<C>& str)
 {
     WriteCompactSize(os, str.size());
     if (!str.empty())
@@ -577,7 +571,7 @@ void Serialize(Stream& os, const std::basic_string<C>& str, int, int)
 }
 
 template<typename Stream, typename C>
-void Unserialize(Stream& is, std::basic_string<C>& str, int, int)
+void Unserialize(Stream& is, std::basic_string<C>& str)
 {
     unsigned int nSize = ReadCompactSize(is);
     str.resize(nSize);
@@ -591,7 +585,7 @@ void Unserialize(Stream& is, std::basic_string<C>& str, int, int)
  * prevector
  */
 template<typename Stream, unsigned int N, typename T>
-void Serialize_impl(Stream& os, const prevector<N, T>& v, int nType, int nVersion, const unsigned char&)
+void Serialize_impl(Stream& os, const prevector<N, T>& v, const unsigned char&)
 {
     WriteCompactSize(os, v.size());
     if (!v.empty())
@@ -599,22 +593,22 @@ void Serialize_impl(Stream& os, const prevector<N, T>& v, int nType, int nVersio
 }
 
 template<typename Stream, unsigned int N, typename T, typename V>
-void Serialize_impl(Stream& os, const prevector<N, T>& v, int nType, int nVersion, const V&)
+void Serialize_impl(Stream& os, const prevector<N, T>& v, const V&)
 {
     WriteCompactSize(os, v.size());
     for (typename prevector<N, T>::const_iterator vi = v.begin(); vi != v.end(); ++vi)
-        ::Serialize(os, (*vi), nType, nVersion);
+        ::Serialize(os, (*vi));
 }
 
 template<typename Stream, unsigned int N, typename T>
-inline void Serialize(Stream& os, const prevector<N, T>& v, int nType, int nVersion)
+inline void Serialize(Stream& os, const prevector<N, T>& v)
 {
-    Serialize_impl(os, v, nType, nVersion, T());
+    Serialize_impl(os, v, T());
 }
 
 
 template<typename Stream, unsigned int N, typename T>
-void Unserialize_impl(Stream& is, prevector<N, T>& v, int nType, int nVersion, const unsigned char&)
+void Unserialize_impl(Stream& is, prevector<N, T>& v, const unsigned char&)
 {
     // Limit size per read so bogus size value won't cause out of memory
     v.clear();
@@ -630,7 +624,7 @@ void Unserialize_impl(Stream& is, prevector<N, T>& v, int nType, int nVersion, c
 }
 
 template<typename Stream, unsigned int N, typename T, typename V>
-void Unserialize_impl(Stream& is, prevector<N, T>& v, int nType, int nVersion, const V&)
+void Unserialize_impl(Stream& is, prevector<N, T>& v, const V&)
 {
     v.clear();
     unsigned int nSize = ReadCompactSize(is);
@@ -643,14 +637,14 @@ void Unserialize_impl(Stream& is, prevector<N, T>& v, int nType, int nVersion, c
             nMid = nSize;
         v.resize(nMid);
         for (; i < nMid; i++)
-            Unserialize(is, v[i], nType, nVersion);
+            Unserialize(is, v[i]);
     }
 }
 
 template<typename Stream, unsigned int N, typename T>
-inline void Unserialize(Stream& is, prevector<N, T>& v, int nType, int nVersion)
+inline void Unserialize(Stream& is, prevector<N, T>& v)
 {
-    Unserialize_impl(is, v, nType, nVersion, T());
+    Unserialize_impl(is, v, T());
 }
 
 
@@ -659,7 +653,7 @@ inline void Unserialize(Stream& is, prevector<N, T>& v, int nType, int nVersion)
  * vector
  */
 template<typename Stream, typename T, typename A>
-void Serialize_impl(Stream& os, const std::vector<T, A>& v, int nType, int nVersion, const unsigned char&)
+void Serialize_impl(Stream& os, const std::vector<T, A>& v, const unsigned char&)
 {
     WriteCompactSize(os, v.size());
     if (!v.empty())
@@ -667,22 +661,22 @@ void Serialize_impl(Stream& os, const std::vector<T, A>& v, int nType, int nVers
 }
 
 template<typename Stream, typename T, typename A, typename V>
-void Serialize_impl(Stream& os, const std::vector<T, A>& v, int nType, int nVersion, const V&)
+void Serialize_impl(Stream& os, const std::vector<T, A>& v, const V&)
 {
     WriteCompactSize(os, v.size());
     for (typename std::vector<T, A>::const_iterator vi = v.begin(); vi != v.end(); ++vi)
-        ::Serialize(os, (*vi), nType, nVersion);
+        ::Serialize(os, (*vi));
 }
 
 template<typename Stream, typename T, typename A>
-inline void Serialize(Stream& os, const std::vector<T, A>& v, int nType, int nVersion)
+inline void Serialize(Stream& os, const std::vector<T, A>& v)
 {
-    Serialize_impl(os, v, nType, nVersion, T());
+    Serialize_impl(os, v, T());
 }
 
 
 template<typename Stream, typename T, typename A>
-void Unserialize_impl(Stream& is, std::vector<T, A>& v, int nType, int nVersion, const unsigned char&)
+void Unserialize_impl(Stream& is, std::vector<T, A>& v, const unsigned char&)
 {
     // Limit size per read so bogus size value won't cause out of memory
     v.clear();
@@ -698,7 +692,7 @@ void Unserialize_impl(Stream& is, std::vector<T, A>& v, int nType, int nVersion,
 }
 
 template<typename Stream, typename T, typename A, typename V>
-void Unserialize_impl(Stream& is, std::vector<T, A>& v, int nType, int nVersion, const V&)
+void Unserialize_impl(Stream& is, std::vector<T, A>& v, const V&)
 {
     v.clear();
     unsigned int nSize = ReadCompactSize(is);
@@ -711,14 +705,14 @@ void Unserialize_impl(Stream& is, std::vector<T, A>& v, int nType, int nVersion,
             nMid = nSize;
         v.resize(nMid);
         for (; i < nMid; i++)
-            Unserialize(is, v[i], nType, nVersion);
+            Unserialize(is, v[i]);
     }
 }
 
 template<typename Stream, typename T, typename A>
-inline void Unserialize(Stream& is, std::vector<T, A>& v, int nType, int nVersion)
+inline void Unserialize(Stream& is, std::vector<T, A>& v)
 {
-    Unserialize_impl(is, v, nType, nVersion, T());
+    Unserialize_impl(is, v, T());
 }
 
 
@@ -784,17 +778,17 @@ void Unserialize(Stream& is, boost::array<T, N>& item, int nType, int nVersion)
  * pair
  */
 template<typename Stream, typename K, typename T>
-void Serialize(Stream& os, const std::pair<K, T>& item, int nType, int nVersion)
+void Serialize(Stream& os, const std::pair<K, T>& item)
 {
-    Serialize(os, item.first, nType, nVersion);
-    Serialize(os, item.second, nType, nVersion);
+    Serialize(os, item.first);
+    Serialize(os, item.second);
 }
 
 template<typename Stream, typename K, typename T>
-void Unserialize(Stream& is, std::pair<K, T>& item, int nType, int nVersion)
+void Unserialize(Stream& is, std::pair<K, T>& item)
 {
-    Unserialize(is, item.first, nType, nVersion);
-    Unserialize(is, item.second, nType, nVersion);
+    Unserialize(is, item.first);
+    Unserialize(is, item.second);
 }
 
 
@@ -803,15 +797,15 @@ void Unserialize(Stream& is, std::pair<K, T>& item, int nType, int nVersion)
  * map
  */
 template<typename Stream, typename K, typename T, typename Pred, typename A>
-void Serialize(Stream& os, const std::map<K, T, Pred, A>& m, int nType, int nVersion)
+void Serialize(Stream& os, const std::map<K, T, Pred, A>& m)
 {
     WriteCompactSize(os, m.size());
     for (typename std::map<K, T, Pred, A>::const_iterator mi = m.begin(); mi != m.end(); ++mi)
-        Serialize(os, (*mi), nType, nVersion);
+        Serialize(os, (*mi));
 }
 
 template<typename Stream, typename K, typename T, typename Pred, typename A>
-void Unserialize(Stream& is, std::map<K, T, Pred, A>& m, int nType, int nVersion)
+void Unserialize(Stream& is, std::map<K, T, Pred, A>& m)
 {
     m.clear();
     unsigned int nSize = ReadCompactSize(is);
@@ -819,7 +813,7 @@ void Unserialize(Stream& is, std::map<K, T, Pred, A>& m, int nType, int nVersion
     for (unsigned int i = 0; i < nSize; i++)
     {
         std::pair<K, T> item;
-        Unserialize(is, item, nType, nVersion);
+        Unserialize(is, item);
         mi = m.insert(mi, item);
     }
 }
@@ -830,15 +824,15 @@ void Unserialize(Stream& is, std::map<K, T, Pred, A>& m, int nType, int nVersion
  * set
  */
 template<typename Stream, typename K, typename Pred, typename A>
-void Serialize(Stream& os, const std::set<K, Pred, A>& m, int nType, int nVersion)
+void Serialize(Stream& os, const std::set<K, Pred, A>& m)
 {
     WriteCompactSize(os, m.size());
     for (typename std::set<K, Pred, A>::const_iterator it = m.begin(); it != m.end(); ++it)
-        Serialize(os, (*it), nType, nVersion);
+        Serialize(os, (*it));
 }
 
 template<typename Stream, typename K, typename Pred, typename A>
-void Unserialize(Stream& is, std::set<K, Pred, A>& m, int nType, int nVersion)
+void Unserialize(Stream& is, std::set<K, Pred, A>& m)
 {
     m.clear();
     unsigned int nSize = ReadCompactSize(is);
@@ -846,7 +840,7 @@ void Unserialize(Stream& is, std::set<K, Pred, A>& m, int nType, int nVersion)
     for (unsigned int i = 0; i < nSize; i++)
     {
         K key;
-        Unserialize(is, key, nType, nVersion);
+        Unserialize(is, key);
         it = m.insert(it, key);
     }
 }
@@ -893,15 +887,15 @@ struct CSerActionUnserialize
 };
 
 template<typename Stream, typename T>
-inline void SerReadWrite(Stream& s, const T& obj, int nType, int nVersion, CSerActionSerialize ser_action)
+inline void SerReadWrite(Stream& s, const T& obj, CSerActionSerialize ser_action)
 {
-    ::Serialize(s, obj, nType, nVersion);
+    ::Serialize(s, obj);
 }
 
 template<typename Stream, typename T>
-inline void SerReadWrite(Stream& s, T& obj, int nType, int nVersion, CSerActionUnserialize ser_action)
+inline void SerReadWrite(Stream& s, T& obj, CSerActionUnserialize ser_action)
 {
-    ::Unserialize(s, obj, nType, nVersion);
+    ::Unserialize(s, obj);
 }
 
 
@@ -920,7 +914,6 @@ protected:
     const int nType;
     const int nVersion;
 public:
-
     CSizeComputer(int nTypeIn, int nVersionIn) : nSize(0), nType(nTypeIn), nVersion(nVersionIn) {}
 
     void write(const char *psz, size_t nSize)
@@ -931,61 +924,64 @@ public:
     template<typename T>
     CSizeComputer& operator<<(const T& obj)
     {
-        ::Serialize(*this, obj, nType, nVersion);
+        ::Serialize(*this, obj);
         return (*this);
     }
 
     size_t size() const {
         return nSize;
     }
+
+    int GetVersion() const { return nVersion; }
+    int GetType() const { return nType; }
 };
 
 template<typename Stream>
-void SerializeMany(Stream& s, int nType, int nVersion)
+void SerializeMany(Stream& s)
 {
 }
 
 template<typename Stream, typename Arg>
-void SerializeMany(Stream& s, int nType, int nVersion, Arg&& arg)
+void SerializeMany(Stream& s, Arg&& arg)
 {
-    ::Serialize(s, std::forward<Arg>(arg), nType, nVersion);
+    ::Serialize(s, std::forward<Arg>(arg));
 }
 
 template<typename Stream, typename Arg, typename... Args>
-void SerializeMany(Stream& s, int nType, int nVersion, Arg&& arg, Args&&... args)
+void SerializeMany(Stream& s, Arg&& arg, Args&&... args)
 {
-    ::Serialize(s, std::forward<Arg>(arg), nType, nVersion);
-    ::SerializeMany(s, nType, nVersion, std::forward<Args>(args)...);
+    ::Serialize(s, std::forward<Arg>(arg));
+    ::SerializeMany(s, std::forward<Args>(args)...);
 }
 
 template<typename Stream>
-inline void UnserializeMany(Stream& s, int nType, int nVersion)
+inline void UnserializeMany(Stream& s)
 {
 }
 
 template<typename Stream, typename Arg>
-inline void UnserializeMany(Stream& s, int nType, int nVersion, Arg& arg)
+inline void UnserializeMany(Stream& s, Arg& arg)
 {
-    ::Unserialize(s, arg, nType, nVersion);
+    ::Unserialize(s, arg);
 }
 
 template<typename Stream, typename Arg, typename... Args>
-inline void UnserializeMany(Stream& s, int nType, int nVersion, Arg& arg, Args&... args)
+inline void UnserializeMany(Stream& s, Arg& arg, Args&... args)
 {
-    ::Unserialize(s, arg, nType, nVersion);
-    ::UnserializeMany(s, nType, nVersion, args...);
+    ::Unserialize(s, arg);
+    ::UnserializeMany(s, args...);
 }
 
 template<typename Stream, typename... Args>
-inline void SerReadWriteMany(Stream& s, int nType, int nVersion, CSerActionSerialize ser_action, Args&&... args)
+inline void SerReadWriteMany(Stream& s, CSerActionSerialize ser_action, Args&&... args)
 {
-    ::SerializeMany(s, nType, nVersion, std::forward<Args>(args)...);
+    ::SerializeMany(s, std::forward<Args>(args)...);
 }
 
 template<typename Stream, typename... Args>
-inline void SerReadWriteMany(Stream& s, int nType, int nVersion, CSerActionUnserialize ser_action, Args&... args)
+inline void SerReadWriteMany(Stream& s, CSerActionUnserialize ser_action, Args&... args)
 {
-    ::UnserializeMany(s, nType, nVersion, args...);
+    ::UnserializeMany(s, args...);
 }
 
 template <typename T>
diff --git a/src/streams.h b/src/streams.h
index 6fc8a93da..2fb6c7e01 100644
--- a/src/streams.h
+++ b/src/streams.h
@@ -85,7 +85,7 @@ public:
     CBaseDataStream(int nTypeIn, int nVersionIn, Args&&... args)
     {
         Init(nTypeIn, nVersionIn);
-        ::SerializeMany(*this, nType, nVersion, std::forward<Args>(args)...);
+        ::SerializeMany(*this, std::forward<Args>(args)...);
     }
 
     void Init(int nTypeIn, int nVersionIn)
@@ -268,7 +268,7 @@ public:
     }
 
     template<typename Stream>
-    void Serialize(Stream& s, int nType, int nVersion) const
+    void Serialize(Stream& s) const
     {
         // Special case: stream << stream concatenates like stream += stream
         if (!vch.empty())
@@ -279,7 +279,7 @@ public:
     CBaseDataStream& operator<<(const T& obj)
     {
         // Serialize to this stream
-        ::Serialize(*this, obj, nType, nVersion);
+        ::Serialize(*this, obj);
         return (*this);
     }
 
@@ -287,7 +287,7 @@ public:
     CBaseDataStream& operator>>(T& obj)
     {
         // Unserialize from this stream
-        ::Unserialize(*this, obj, nType, nVersion);
+        ::Unserialize(*this, obj);
         return (*this);
     }
 
@@ -428,7 +428,7 @@ public:
         // Serialize to this stream
         if (!file)
             throw std::ios_base::failure("CAutoFile::operator<<: file handle is NULL");
-        ::Serialize(*this, obj, nType, nVersion);
+        ::Serialize(*this, obj);
         return (*this);
     }
 
@@ -438,7 +438,7 @@ public:
         // Unserialize from this stream
         if (!file)
             throw std::ios_base::failure("CAutoFile::operator>>: file handle is NULL");
-        ::Unserialize(*this, obj, nType, nVersion);
+        ::Unserialize(*this, obj);
         return (*this);
     }
 };
@@ -497,6 +497,9 @@ public:
         fclose();
     }
 
+    int GetVersion() const { return nVersion; }
+    int GetType() const { return nType; }
+
     void fclose()
     {
         if (src) {
@@ -575,7 +578,7 @@ public:
     template<typename T>
     CBufferedFile& operator>>(T& obj) {
         // Unserialize from this stream
-        ::Unserialize(*this, obj, nType, nVersion);
+        ::Unserialize(*this, obj);
         return (*this);
     }
 
diff --git a/src/test/bloom_tests.cpp b/src/test/bloom_tests.cpp
index e99f99226..a8f3c0454 100644
--- a/src/test/bloom_tests.cpp
+++ b/src/test/bloom_tests.cpp
@@ -41,7 +41,7 @@ BOOST_AUTO_TEST_CASE(bloom_create_insert_serialize)
     BOOST_CHECK_MESSAGE(filter.contains(ParseHex("b9300670b4c5366e95b2699e8b18bc75e5f729c5")), "BloomFilter doesn't contain just-inserted object (3)!");
 
     CDataStream stream(SER_NETWORK, PROTOCOL_VERSION);
-    filter.Serialize(stream, SER_NETWORK, PROTOCOL_VERSION);
+    stream << filter;
 
     vector<unsigned char> vch = ParseHex("03614e9b050000000000000001");
     vector<char> expected(vch.size());
@@ -73,7 +73,7 @@ BOOST_AUTO_TEST_CASE(bloom_create_insert_serialize_with_tweak)
     BOOST_CHECK_MESSAGE(filter.contains(ParseHex("b9300670b4c5366e95b2699e8b18bc75e5f729c5")), "BloomFilter doesn't contain just-inserted object (3)!");
 
     CDataStream stream(SER_NETWORK, PROTOCOL_VERSION);
-    filter.Serialize(stream, SER_NETWORK, PROTOCOL_VERSION);
+    stream << filter;
 
     vector<unsigned char> vch = ParseHex("03ce4299050000000100008001");
     vector<char> expected(vch.size());
@@ -100,7 +100,7 @@ BOOST_AUTO_TEST_CASE(bloom_create_insert_key)
     filter.insert(vector<unsigned char>(hash.begin(), hash.end()));
 
     CDataStream stream(SER_NETWORK, PROTOCOL_VERSION);
-    filter.Serialize(stream, SER_NETWORK, PROTOCOL_VERSION);
+    stream << filter;
 
     vector<unsigned char> vch = ParseHex("038fc16b080000000000000001");
     vector<char> expected(vch.size());
diff --git a/src/test/dbwrapper_tests.cpp b/src/test/dbwrapper_tests.cpp
index c9b119ab2..a047938db 100644
--- a/src/test/dbwrapper_tests.cpp
+++ b/src/test/dbwrapper_tests.cpp
@@ -163,7 +163,7 @@ struct StringContentsSerializer {
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         if (ser_action.ForRead()) {
             str.clear();
             char c = 0;
diff --git a/src/test/serialize_tests.cpp b/src/test/serialize_tests.cpp
index 59a42d0a9..6c0144271 100644
--- a/src/test/serialize_tests.cpp
+++ b/src/test/serialize_tests.cpp
@@ -50,7 +50,7 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         READWRITE(intval);
         READWRITE(boolval);
         READWRITE(stringval);
@@ -75,7 +75,7 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         READWRITEMANY(intval, boolval, stringval, FLATDATA(charstrval), txval);
     }
 };
diff --git a/src/test/uint256_tests.cpp b/src/test/uint256_tests.cpp
index f8b9c70e0..a6501faa1 100644
--- a/src/test/uint256_tests.cpp
+++ b/src/test/uint256_tests.cpp
@@ -187,22 +187,22 @@ BOOST_AUTO_TEST_CASE( methods ) // GetHex SetHex begin() end() size() GetLow64 G
     BOOST_CHECK(GetSerializeSize(R1L, 0, PROTOCOL_VERSION) == 32);
     BOOST_CHECK(GetSerializeSize(ZeroL, 0, PROTOCOL_VERSION) == 32);
 
-    std::stringstream ss;
-    R1L.Serialize(ss,0,PROTOCOL_VERSION);
+    CDataStream ss(0, PROTOCOL_VERSION);
+    ss << R1L;
     BOOST_CHECK(ss.str() == std::string(R1Array,R1Array+32));
-    TmpL.Unserialize(ss,0,PROTOCOL_VERSION);
+    ss >> TmpL;
     BOOST_CHECK(R1L == TmpL);
-    ss.str("");
-    ZeroL.Serialize(ss,0,PROTOCOL_VERSION);
+    ss.clear();
+    ss << ZeroL;
     BOOST_CHECK(ss.str() == std::string(ZeroArray,ZeroArray+32));
-    TmpL.Unserialize(ss,0,PROTOCOL_VERSION);
+    ss >> TmpL;
     BOOST_CHECK(ZeroL == TmpL);
-    ss.str("");
-    MaxL.Serialize(ss,0,PROTOCOL_VERSION);
+    ss.clear();
+    ss << MaxL;
     BOOST_CHECK(ss.str() == std::string(MaxArray,MaxArray+32));
-    TmpL.Unserialize(ss,0,PROTOCOL_VERSION);
+    ss >> TmpL;
     BOOST_CHECK(MaxL == TmpL);
-    ss.str("");
+    ss.clear();
 
     BOOST_CHECK(R1S.GetHex() == R1S.ToString());
     BOOST_CHECK(R2S.GetHex() == R2S.ToString());
@@ -233,21 +233,21 @@ BOOST_AUTO_TEST_CASE( methods ) // GetHex SetHex begin() end() size() GetLow64 G
     BOOST_CHECK(GetSerializeSize(R1S, 0, PROTOCOL_VERSION) == 20);
     BOOST_CHECK(GetSerializeSize(ZeroS, 0, PROTOCOL_VERSION) == 20);
 
-    R1S.Serialize(ss,0,PROTOCOL_VERSION);
+    ss << R1S;
     BOOST_CHECK(ss.str() == std::string(R1Array,R1Array+20));
-    TmpS.Unserialize(ss,0,PROTOCOL_VERSION);
+    ss >> TmpS;
     BOOST_CHECK(R1S == TmpS);
-    ss.str("");
-    ZeroS.Serialize(ss,0,PROTOCOL_VERSION);
+    ss.clear();
+    ss << ZeroS;
     BOOST_CHECK(ss.str() == std::string(ZeroArray,ZeroArray+20));
-    TmpS.Unserialize(ss,0,PROTOCOL_VERSION);
+    ss >> TmpS;
     BOOST_CHECK(ZeroS == TmpS);
-    ss.str("");
-    MaxS.Serialize(ss,0,PROTOCOL_VERSION);
+    ss.clear();
+    ss << MaxS;
     BOOST_CHECK(ss.str() == std::string(MaxArray,MaxArray+20));
-    TmpS.Unserialize(ss,0,PROTOCOL_VERSION);
+    ss >> TmpS;
     BOOST_CHECK(MaxS == TmpS);
-    ss.str("");
+    ss.clear();
 }
 
 BOOST_AUTO_TEST_CASE( conversion )
diff --git a/src/uint256.h b/src/uint256.h
index 6e79d31cd..b3a6cb242 100644
--- a/src/uint256.h
+++ b/src/uint256.h
@@ -76,13 +76,13 @@ public:
     }
 
     template<typename Stream>
-    void Serialize(Stream& s, int nType, int nVersion) const
+    void Serialize(Stream& s) const
     {
         s.write((char*)data, sizeof(data));
     }
 
     template<typename Stream>
-    void Unserialize(Stream& s, int nType, int nVersion)
+    void Unserialize(Stream& s)
     {
         s.read((char*)data, sizeof(data));
     }
diff --git a/src/undo.h b/src/undo.h
index 274c01ed9..e01814e72 100644
--- a/src/undo.h
+++ b/src/undo.h
@@ -28,22 +28,22 @@ public:
     CTxInUndo(const CTxOut &txoutIn, bool fCoinBaseIn = false, unsigned int nHeightIn = 0, int nVersionIn = 0) : txout(txoutIn), fCoinBase(fCoinBaseIn), nHeight(nHeightIn), nVersion(nVersionIn) { }
 
     template<typename Stream>
-    void Serialize(Stream &s, int nType, int nVersion) const {
-        ::Serialize(s, VARINT(nHeight*2+(fCoinBase ? 1 : 0)), nType, nVersion);
+    void Serialize(Stream &s) const {
+        ::Serialize(s, VARINT(nHeight*2+(fCoinBase ? 1 : 0)));
         if (nHeight > 0)
-            ::Serialize(s, VARINT(this->nVersion), nType, nVersion);
-        ::Serialize(s, CTxOutCompressor(REF(txout)), nType, nVersion);
+            ::Serialize(s, VARINT(this->nVersion));
+        ::Serialize(s, CTxOutCompressor(REF(txout)));
     }
 
     template<typename Stream>
-    void Unserialize(Stream &s, int nType, int nVersion) {
+    void Unserialize(Stream &s) {
         unsigned int nCode = 0;
-        ::Unserialize(s, VARINT(nCode), nType, nVersion);
+        ::Unserialize(s, VARINT(nCode));
         nHeight = nCode / 2;
         fCoinBase = nCode & 1;
         if (nHeight > 0)
-            ::Unserialize(s, VARINT(this->nVersion), nType, nVersion);
-        ::Unserialize(s, REF(CTxOutCompressor(REF(txout))), nType, nVersion);
+            ::Unserialize(s, VARINT(this->nVersion));
+        ::Unserialize(s, REF(CTxOutCompressor(REF(txout))));
     }
 };
 
@@ -57,7 +57,7 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         READWRITE(vprevout);
     }
 };
@@ -72,7 +72,7 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         READWRITE(vtxundo);
         READWRITE(old_tree_root);
     }
diff --git a/src/wallet/crypter.h b/src/wallet/crypter.h
index bcee188cf..e0d91ee5a 100644
--- a/src/wallet/crypter.h
+++ b/src/wallet/crypter.h
@@ -48,7 +48,7 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         READWRITE(vchCryptedKey);
         READWRITE(vchSalt);
         READWRITE(nDerivationMethod);
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index 3530d7632..5a16cb290 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -93,8 +93,9 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
-        if (!(nType & SER_GETHASH))
+    inline void SerializationOp(Stream& s, Operation ser_action) {
+        int nVersion = s.GetVersion();
+        if (!(s.GetType() & SER_GETHASH))
             READWRITE(nVersion);
         READWRITE(nTime);
         READWRITE(vchPubKey);
@@ -314,7 +315,7 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         READWRITE(*(CTransaction*)this);
         READWRITE(hashBlock);
         READWRITE(vMerkleBranch);
@@ -432,7 +433,7 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         if (ser_action.ForRead())
             Init(NULL);
         char fSpent = false;
@@ -565,8 +566,9 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
-        if (!(nType & SER_GETHASH))
+    inline void SerializationOp(Stream& s, Operation ser_action) {
+        int nVersion = s.GetVersion();
+        if (!(s.GetType() & SER_GETHASH))
             READWRITE(nVersion);
         READWRITE(vchPrivKey);
         READWRITE(nTimeCreated);
@@ -610,8 +612,9 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
-        if (!(nType & SER_GETHASH))
+    inline void SerializationOp(Stream& s, Operation ser_action) {
+        int nVersion = s.GetVersion();
+        if (!(s.GetType() & SER_GETHASH))
             READWRITE(nVersion);
         //! Note: strAccount is serialized as part of the key, not here.
         READWRITE(nCreditDebit);
@@ -624,7 +627,7 @@ public:
 
             if (!(mapValue.empty() && _ssExtra.empty()))
             {
-                CDataStream ss(nType, nVersion);
+                CDataStream ss(s.GetType(), s.GetVersion());
                 ss.insert(ss.begin(), '\0');
                 ss << mapValue;
                 ss.insert(ss.end(), _ssExtra.begin(), _ssExtra.end());
@@ -640,7 +643,7 @@ public:
             mapValue.clear();
             if (std::string::npos != nSepPos)
             {
-                CDataStream ss(std::vector<char>(strComment.begin() + nSepPos + 1, strComment.end()), nType, nVersion);
+                CDataStream ss(std::vector<char>(strComment.begin() + nSepPos + 1, strComment.end()), s.GetType(), s.GetVersion());
                 ss >> mapValue;
                 _ssExtra = std::vector<char>(ss.begin(), ss.end());
             }
@@ -1204,8 +1207,9 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
-        if (!(nType & SER_GETHASH))
+    inline void SerializationOp(Stream& s, Operation ser_action) {
+        int nVersion = s.GetVersion();
+        if (!(s.GetType() & SER_GETHASH))
             READWRITE(nVersion);
         READWRITE(vchPubKey);
     }
diff --git a/src/wallet/walletdb.h b/src/wallet/walletdb.h
index a977e17ee..c388921f0 100644
--- a/src/wallet/walletdb.h
+++ b/src/wallet/walletdb.h
@@ -60,7 +60,7 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+    inline void SerializationOp(Stream& s, Operation ser_action) {
         READWRITE(this->nVersion);
         READWRITE(nCreateTime);
     }