diff --git a/src/addrdb.h b/src/addrdb.h
index 62835a6fb..339943ca5 100644
--- a/src/addrdb.h
+++ b/src/addrdb.h
@@ -46,7 +46,7 @@ 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);
         READWRITE(nBanUntil);
diff --git a/src/addrman.h b/src/addrman.h
index 03b380165..cabacbbea 100644
--- a/src/addrman.h
+++ b/src/addrman.h
@@ -58,7 +58,7 @@ 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);
@@ -293,7 +293,7 @@ public:
      * very little in common.
      */
     template<typename Stream>
-    void Serialize(Stream &s, int nType, int nVersionDummy) const
+    void Serialize(Stream &s) const
     {
         LOCK(cs);
 
@@ -343,7 +343,7 @@ 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 5e52f37f2..ba0c86040 100644
--- a/src/amount.h
+++ b/src/amount.h
@@ -64,7 +64,7 @@ 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/blockencodings.h b/src/blockencodings.h
index 99b1cb140..4035b87eb 100644
--- a/src/blockencodings.h
+++ b/src/blockencodings.h
@@ -21,7 +21,7 @@ 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(tx); //TODO: Compress tx encoding
     }
 };
@@ -35,7 +35,7 @@ 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(blockhash);
         uint64_t indexes_size = (uint64_t)indexes.size();
         READWRITE(COMPACTSIZE(indexes_size));
@@ -81,7 +81,7 @@ 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(blockhash);
         uint64_t txn_size = (uint64_t)txn.size();
         READWRITE(COMPACTSIZE(txn_size));
@@ -109,7 +109,7 @@ struct PrefilledTransaction {
     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) {
         uint64_t idx = index;
         READWRITE(COMPACTSIZE(idx));
         if (idx > std::numeric_limits<uint16_t>::max())
@@ -155,7 +155,7 @@ 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(nonce);
 
diff --git a/src/bloom.h b/src/bloom.h
index ad6de625d..d3a017371 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 46a16a306..0aac5de5c 100644
--- a/src/chain.h
+++ b/src/chain.h
@@ -28,7 +28,7 @@ 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));
@@ -76,7 +76,7 @@ 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));
     }
@@ -357,8 +357,9 @@ 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 3e134cf67..d295b3c94 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 73e31580d..94e7f5ea6 100644
--- a/src/hash.h
+++ b/src/hash.h
@@ -138,6 +138,9 @@ 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);
     }
@@ -152,7 +155,7 @@ 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 48a07d62c..ff5252b7a 100644
--- a/src/key.h
+++ b/src/key.h
@@ -162,7 +162,7 @@ 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);
@@ -171,7 +171,7 @@ 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/merkleblock.h b/src/merkleblock.h
index 835cbcce5..17c33194a 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;
@@ -148,7 +148,7 @@ 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/net.h b/src/net.h
index 4ceeec2f0..8289a06d9 100644
--- a/src/net.h
+++ b/src/net.h
@@ -140,7 +140,7 @@ public:
     void PushMessageWithVersionAndFlag(CNode* pnode, int nVersion, int flag, const std::string& sCommand, Args&&... args)
     {
         auto msg(BeginMessage(pnode, nVersion, flag, sCommand));
-        ::SerializeMany(msg, msg.GetType(), msg.GetVersion(), std::forward<Args>(args)...);
+        ::SerializeMany(msg, std::forward<Args>(args)...);
         EndMessage(msg);
         PushMessage(pnode, msg, sCommand);
     }
diff --git a/src/netaddress.h b/src/netaddress.h
index 9330fe332..9dffaa57e 100644
--- a/src/netaddress.h
+++ b/src/netaddress.h
@@ -85,7 +85,7 @@ 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));
         }
 
@@ -122,7 +122,7 @@ class CSubNet
         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(network);
             READWRITE(FLATDATA(netmask));
             READWRITE(FLATDATA(valid));
@@ -159,7 +159,7 @@ 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 72dfed985..d148aec1e 100644
--- a/src/primitives/block.h
+++ b/src/primitives/block.h
@@ -36,7 +36,7 @@ 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(hashPrevBlock);
         READWRITE(hashMerkleRoot);
@@ -92,7 +92,7 @@ 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);
     }
@@ -137,8 +137,9 @@ 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 714ab3454..1d176e5d8 100644
--- a/src/primitives/transaction.h
+++ b/src/primitives/transaction.h
@@ -28,7 +28,7 @@ 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);
     }
@@ -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) {
         READWRITE(prevout);
         READWRITE(*(CScriptBase*)(&scriptSig));
         READWRITE(nSequence);
@@ -144,7 +144,7 @@ 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));
     }
@@ -219,7 +219,7 @@ 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(scriptWitness.stack);
     }
@@ -255,7 +255,7 @@ public:
     }
 
     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)
     {
         for (size_t n = 0; n < vtxinwit.size(); n++) {
             READWRITE(vtxinwit[n]);
@@ -287,8 +287,8 @@ struct CMutableTransaction;
  * - uint32_t nLockTime
  */
 template<typename Stream, typename Operation, typename TxType>
-inline void SerializeTransaction(TxType& tx, Stream& s, Operation ser_action, int nType, int nVersion) {
-    const bool fAllowWitness = !(nVersion & SERIALIZE_TRANSACTION_NO_WITNESS);
+inline void SerializeTransaction(TxType& tx, Stream& s, Operation ser_action) {
+    const bool fAllowWitness = !(s.GetVersion() & SERIALIZE_TRANSACTION_NO_WITNESS);
 
     READWRITE(*const_cast<int32_t*>(&tx.nVersion));
     unsigned char flags = 0;
@@ -385,8 +385,8 @@ public:
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
-        SerializeTransaction(*this, s, ser_action, nType, nVersion);
+    inline void SerializationOp(Stream& s, Operation ser_action) {
+        SerializeTransaction(*this, s, ser_action);
         if (ser_action.ForRead()) {
             UpdateHash();
         }
@@ -456,8 +456,8 @@ struct CMutableTransaction
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
-        SerializeTransaction(*this, s, ser_action, nType, nVersion);
+    inline void SerializationOp(Stream& s, Operation ser_action) {
+        SerializeTransaction(*this, s, ser_action);
     }
 
     /** Compute the hash of this CMutableTransaction. This is computed on the
diff --git a/src/protocol.h b/src/protocol.h
index d19e0d3a5..a52d9a67b 100644
--- a/src/protocol.h
+++ b/src/protocol.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(FLATDATA(pchMessageStart));
         READWRITE(FLATDATA(pchCommand));
@@ -289,14 +289,15 @@ 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);
         uint64_t nServicesInt = nServices;
         READWRITE(nServicesInt);
@@ -343,7 +344,7 @@ 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 3277218bb..15207f89e 100644
--- a/src/pubkey.h
+++ b/src/pubkey.h
@@ -117,14 +117,14 @@ 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 <= 65) {
@@ -211,7 +211,7 @@ 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);
@@ -220,7 +220,7 @@ 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/qt/recentrequeststablemodel.h b/src/qt/recentrequeststablemodel.h
index 0193e748d..8ee2c9cba 100644
--- a/src/qt/recentrequeststablemodel.h
+++ b/src/qt/recentrequeststablemodel.h
@@ -27,7 +27,7 @@ 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) {
         unsigned int nDate = date.toTime_t();
 
         READWRITE(this->nVersion);
diff --git a/src/qt/walletmodel.h b/src/qt/walletmodel.h
index 6a5670e37..eedf6e8ce 100644
--- a/src/qt/walletmodel.h
+++ b/src/qt/walletmodel.h
@@ -65,7 +65,7 @@ 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) {
         std::string sAddress = address.toStdString();
         std::string sLabel = label.toStdString();
         std::string sMessage = message.toStdString();
diff --git a/src/rest.cpp b/src/rest.cpp
index b8b542062..90cca6f48 100644
--- a/src/rest.cpp
+++ b/src/rest.cpp
@@ -50,7 +50,7 @@ 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/bitcoinconsensus.cpp b/src/script/bitcoinconsensus.cpp
index ec573c318..069ac55bf 100644
--- a/src/script/bitcoinconsensus.cpp
+++ b/src/script/bitcoinconsensus.cpp
@@ -42,10 +42,12 @@ 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/script/interpreter.cpp b/src/script/interpreter.cpp
index 0e17ddc13..a6403f936 100644
--- a/src/script/interpreter.cpp
+++ b/src/script/interpreter.cpp
@@ -1069,7 +1069,7 @@ public:
 
     /** Serialize the passed scriptCode, skipping OP_CODESEPARATORs */
     template<typename S>
-    void SerializeScriptCode(S &s, int nType, int nVersion) const {
+    void SerializeScriptCode(S &s) const {
         CScript::const_iterator it = scriptCode.begin();
         CScript::const_iterator itBegin = it;
         opcodetype opcode;
@@ -1092,53 +1092,53 @@ 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
         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);
     }
 };
 
diff --git a/src/serialize.h b/src/serialize.h
index 80289a365..fc4291fe9 100644
--- a/src/serialize.h
+++ b/src/serialize.h
@@ -159,8 +159,8 @@ 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
@@ -168,45 +168,42 @@ 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; }
 
 
 
@@ -386,13 +383,13 @@ 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);
     }
@@ -407,12 +404,12 @@ 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);
     }
 };
@@ -425,12 +422,12 @@ 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);
     }
 };
@@ -444,7 +441,7 @@ 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) {
@@ -456,7 +453,7 @@ public:
     }
 
     template<typename Stream>
-    void Serialize(Stream& s, int, int=0) const
+    void Serialize(Stream& s) const
     {
         WriteCompactSize(s, string.size());
         if (!string.empty())
@@ -474,48 +471,48 @@ 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);
 
 /**
  * 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);
 
 
 
@@ -523,20 +520,17 @@ template<typename Stream, typename K, typename Pred, typename A> void Unserializ
 
 /**
  * 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);
 }
 
 
@@ -547,7 +541,7 @@ 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())
@@ -555,7 +549,7 @@ 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);
@@ -569,7 +563,7 @@ 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())
@@ -577,22 +571,22 @@ 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();
@@ -608,7 +602,7 @@ 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);
@@ -621,14 +615,14 @@ 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());
 }
 
 
@@ -637,7 +631,7 @@ 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())
@@ -645,22 +639,22 @@ 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();
@@ -676,7 +670,7 @@ 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);
@@ -689,14 +683,14 @@ 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());
 }
 
 
@@ -705,17 +699,17 @@ inline void Unserialize(Stream& is, std::vector<T, A>& v, int nType, int nVersio
  * 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);
 }
 
 
@@ -724,15 +718,15 @@ 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);
@@ -740,7 +734,7 @@ 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);
     }
 }
@@ -751,15 +745,15 @@ 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);
@@ -767,7 +761,7 @@ 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);
     }
 }
@@ -787,15 +781,15 @@ 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);
 }
 
 
@@ -814,7 +808,6 @@ 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)
@@ -825,61 +818,64 @@ 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 d9965b534..c3e7c9e9e 100644
--- a/src/streams.h
+++ b/src/streams.h
@@ -37,7 +37,7 @@ public:
     OverrideStream<Stream>& operator<<(const T& obj)
     {
         // Serialize to this stream
-        ::Serialize(*this->stream, obj, nType, nVersion);
+        ::Serialize(*this, obj);
         return (*this);
     }
 
@@ -45,9 +45,22 @@ public:
     OverrideStream<Stream>& operator>>(T& obj)
     {
         // Unserialize from this stream
-        ::Unserialize(*this->stream, obj, nType, nVersion);
+        ::Unserialize(*this, obj);
         return (*this);
     }
+
+    void write(const char* pch, size_t nSize)
+    {
+        stream->write(pch, nSize);
+    }
+
+    void read(char* pch, size_t nSize)
+    {
+        stream->read(pch, nSize);
+    }
+
+    int GetVersion() const { return nVersion; }
+    int GetType() const { return nType; }
 };
 
 template<typename S>
@@ -118,7 +131,7 @@ public:
     CDataStream(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)
@@ -301,7 +314,7 @@ 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())
@@ -312,7 +325,7 @@ public:
     CDataStream& operator<<(const T& obj)
     {
         // Serialize to this stream
-        ::Serialize(*this, obj, nType, nVersion);
+        ::Serialize(*this, obj);
         return (*this);
     }
 
@@ -320,7 +333,7 @@ public:
     CDataStream& operator>>(T& obj)
     {
         // Unserialize from this stream
-        ::Unserialize(*this, obj, nType, nVersion);
+        ::Unserialize(*this, obj);
         return (*this);
     }
 
@@ -456,7 +469,7 @@ 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);
     }
 
@@ -466,7 +479,7 @@ 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);
     }
 };
@@ -525,6 +538,9 @@ public:
         fclose();
     }
 
+    int GetVersion() const { return nVersion; }
+    int GetType() const { return nType; }
+
     void fclose()
     {
         if (src) {
@@ -603,7 +619,7 @@ 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/blockencodings_tests.cpp b/src/test/blockencodings_tests.cpp
index b0d918481..0ed5d62ef 100644
--- a/src/test/blockencodings_tests.cpp
+++ b/src/test/blockencodings_tests.cpp
@@ -129,7 +129,7 @@ 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(nonce);
         size_t shorttxids_size = shorttxids.size();
diff --git a/src/test/bloom_tests.cpp b/src/test/bloom_tests.cpp
index 042fad42d..25fb9ea2b 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 d4d825d19..2d791ee18 100644
--- a/src/test/dbwrapper_tests.cpp
+++ b/src/test/dbwrapper_tests.cpp
@@ -254,7 +254,7 @@ 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/net_tests.cpp b/src/test/net_tests.cpp
index e0460109d..87cb38daa 100644
--- a/src/test/net_tests.cpp
+++ b/src/test/net_tests.cpp
@@ -17,7 +17,7 @@ using namespace std;
 class CAddrManSerializationMock : public CAddrMan
 {
 public:
-    virtual void Serialize(CDataStream& s, int nType, int nVersionDummy) const = 0;
+    virtual void Serialize(CDataStream& s) const = 0;
 
     //! Ensure that bucket placement is always the same for testing purposes.
     void MakeDeterministic()
@@ -30,16 +30,16 @@ public:
 class CAddrManUncorrupted : public CAddrManSerializationMock
 {
 public:
-    void Serialize(CDataStream& s, int nType, int nVersionDummy) const
+    void Serialize(CDataStream& s) const
     {
-        CAddrMan::Serialize(s, nType, nVersionDummy);
+        CAddrMan::Serialize(s);
     }
 };
 
 class CAddrManCorrupted : public CAddrManSerializationMock
 {
 public:
-    void Serialize(CDataStream& s, int nType, int nVersionDummy) const
+    void Serialize(CDataStream& s) const
     {
         // Produces corrupt output that claims addrman has 20 addrs when it only has one addr.
         unsigned char nVersion = 1;
diff --git a/src/test/serialize_tests.cpp b/src/test/serialize_tests.cpp
index 4c0fdc77f..bbadf5795 100644
--- a/src/test/serialize_tests.cpp
+++ b/src/test/serialize_tests.cpp
@@ -28,7 +28,7 @@ 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);
@@ -53,7 +53,7 @@ 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 ba8eb16ba..273294806 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/txdb.h b/src/txdb.h
index adb3f6632..687c68677 100644
--- a/src/txdb.h
+++ b/src/txdb.h
@@ -43,7 +43,7 @@ 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));
     }
diff --git a/src/uint256.h b/src/uint256.h
index 94fe66d26..86e7c0b6c 100644
--- a/src/uint256.h
+++ b/src/uint256.h
@@ -92,13 +92,13 @@ 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 9d6f9bd0d..a5d276e7f 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);
     }
 };
@@ -71,7 +71,7 @@ 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);
     }
 };
diff --git a/src/wallet/crypter.h b/src/wallet/crypter.h
index f00f7fa73..e89c15b5d 100644
--- a/src/wallet/crypter.h
+++ b/src/wallet/crypter.h
@@ -47,7 +47,7 @@ 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 57b17d87a..a527c6d84 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -100,8 +100,9 @@ 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);
@@ -195,7 +196,7 @@ 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) {
         std::vector<uint256> vMerkleBranch; // For compatibility with older versions.
         READWRITE(*(CTransaction*)this);
         READWRITE(hashBlock);
@@ -315,7 +316,7 @@ 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;
@@ -448,8 +449,9 @@ 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);
@@ -493,8 +495,9 @@ 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);
@@ -507,7 +510,7 @@ 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());
@@ -523,7 +526,7 @@ 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());
             }
@@ -986,8 +989,9 @@ 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 a0525bd9a..eb25ac613 100644
--- a/src/wallet/walletdb.h
+++ b/src/wallet/walletdb.h
@@ -54,7 +54,7 @@ public:
     CHDChain() { SetNull(); }
     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(nExternalChainCounter);
@@ -93,7 +93,7 @@ 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);
         if (this->nVersion >= VERSION_WITH_HDDATA)