diff --git a/doc/release-process.txt b/doc/release-process.txt
index 14d8efeb..ee1a5d4a 100644
--- a/doc/release-process.txt
+++ b/doc/release-process.txt
@@ -1,6 +1,6 @@
 * update (commit) version in sources
   bitcoin-qt.pro
-  src/serialize.h
+  src/main.h      (CLIENT_VERSION : PROTOCOL_VERSION in serialize.h is updated only on protocol changes)
   share/setup.nsi
   doc/README*
 
diff --git a/src/bignum.h b/src/bignum.h
index 1a2406b9..f5d545f0 100644
--- a/src/bignum.h
+++ b/src/bignum.h
@@ -338,19 +338,19 @@ public:
         return ToString(16);
     }
 
-    unsigned int GetSerializeSize(int nType=0, int nVersion=VERSION) const
+    unsigned int GetSerializeSize(int nType=0, int nVersion=PROTOCOL_VERSION) const
     {
         return ::GetSerializeSize(getvch(), nType, nVersion);
     }
 
     template<typename Stream>
-    void Serialize(Stream& s, int nType=0, int nVersion=VERSION) const
+    void Serialize(Stream& s, int nType=0, int nVersion=PROTOCOL_VERSION) const
     {
         ::Serialize(s, getvch(), nType, nVersion);
     }
 
     template<typename Stream>
-    void Unserialize(Stream& s, int nType=0, int nVersion=VERSION)
+    void Unserialize(Stream& s, int nType=0, int nVersion=PROTOCOL_VERSION)
     {
         std::vector<unsigned char> vch;
         ::Unserialize(s, vch, nType, nVersion);
diff --git a/src/bitcoinrpc.cpp b/src/bitcoinrpc.cpp
index bb8d8e2d..f29b9dd5 100644
--- a/src/bitcoinrpc.cpp
+++ b/src/bitcoinrpc.cpp
@@ -304,7 +304,8 @@ Value getinfo(const Array& params, bool fHelp)
             "Returns an object containing various state info.");
 
     Object obj;
-    obj.push_back(Pair("version",       (int)VERSION));
+    obj.push_back(Pair("version",       (int)CLIENT_VERSION));
+    obj.push_back(Pair("protocolversion",(int)PROTOCOL_VERSION));
     obj.push_back(Pair("balance",       ValueFromAmount(pwalletMain->GetBalance())));
     obj.push_back(Pair("blocks",        (int)nBestHeight));
     obj.push_back(Pair("connections",   (int)vNodes.size()));
diff --git a/src/db.cpp b/src/db.cpp
index 9ac93b35..696fc736 100644
--- a/src/db.cpp
+++ b/src/db.cpp
@@ -131,7 +131,7 @@ CDB::CDB(const char* pszFile, const char* pszMode) : pdb(NULL)
             {
                 bool fTmp = fReadOnly;
                 fReadOnly = false;
-                WriteVersion(VERSION);
+                WriteVersion(CLIENT_VERSION);
                 fReadOnly = fTmp;
             }
 
@@ -236,7 +236,7 @@ bool CDB::Rewrite(const string& strFile, const char* pszSkip)
                             {
                                 // Update version:
                                 ssValue.clear();
-                                ssValue << VERSION;
+                                ssValue << CLIENT_VERSION;
                             }
                             Dbt datKey(&ssKey[0], ssKey.size());
                             Dbt datValue(&ssValue[0], ssValue.size());
@@ -931,7 +931,7 @@ int CWalletDB::LoadWallet(CWallet* pwallet)
             {
                 int nMinVersion = 0;
                 ssValue >> nMinVersion;
-                if (nMinVersion > VERSION)
+                if (nMinVersion > CLIENT_VERSION)
                     return DB_TOO_NEW;
             }
         }
@@ -956,13 +956,13 @@ int CWalletDB::LoadWallet(CWallet* pwallet)
     if (fIsEncrypted && (nFileVersion == 40000 || nFileVersion == 50000))
         return DB_NEED_REWRITE;
 
-    if (nFileVersion < VERSION) // Update
+    if (nFileVersion < CLIENT_VERSION) // Update
     {
         // Get rid of old debug.log file in current directory
         if (nFileVersion <= 105 && !pszSetDataDir[0])
             unlink("debug.log");
 
-        WriteVersion(VERSION);
+        WriteVersion(CLIENT_VERSION);
     }
 
     return DB_LOAD_OK;
diff --git a/src/main.cpp b/src/main.cpp
index a7871fcc..1da28d4d 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -17,6 +17,11 @@ using namespace boost;
 // Global state
 //
 
+// Name of client reported in the 'version' message. Report the same name
+// for both bitcoind and bitcoin-qt, to make it harder for attackers to
+// target servers or GUI users specifically.
+const std::string CLIENT_NAME("bitcoin-qt");
+
 CCriticalSection cs_setpwalletRegistered;
 set<CWallet*> setpwalletRegistered;
 
@@ -1847,9 +1852,9 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         // Change version
         if (pfrom->nVersion >= 209)
             pfrom->PushMessage("verack");
-        pfrom->vSend.SetVersion(min(pfrom->nVersion, VERSION));
+        pfrom->vSend.SetVersion(min(pfrom->nVersion, PROTOCOL_VERSION));
         if (pfrom->nVersion < 209)
-            pfrom->vRecv.SetVersion(min(pfrom->nVersion, VERSION));
+            pfrom->vRecv.SetVersion(min(pfrom->nVersion, PROTOCOL_VERSION));
 
         if (!pfrom->fInbound)
         {
@@ -1902,7 +1907,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
 
     else if (strCommand == "verack")
     {
-        pfrom->vRecv.SetVersion(min(pfrom->nVersion, VERSION));
+        pfrom->vRecv.SetVersion(min(pfrom->nVersion, PROTOCOL_VERSION));
     }
 
 
diff --git a/src/main.h b/src/main.h
index 3870cee8..e519ef65 100644
--- a/src/main.h
+++ b/src/main.h
@@ -27,6 +27,10 @@ class CRequestTracker;
 class CNode;
 class CBlockIndex;
 
+static const int CLIENT_VERSION = 59900;
+static const bool VERSION_IS_BETA = true;
+extern const std::string CLIENT_NAME;
+
 static const unsigned int MAX_BLOCK_SIZE = 1000000;
 static const unsigned int MAX_BLOCK_SIZE_GEN = MAX_BLOCK_SIZE/2;
 static const int MAX_BLOCK_SIGOPS = MAX_BLOCK_SIZE/50;
@@ -1521,6 +1525,7 @@ public:
 
     bool AppliesTo(int nVersion, std::string strSubVerIn) const
     {
+        // TODO: rework for client-version-embedded-in-strSubVer ?
         return (IsInEffect() &&
                 nMinVer <= nVersion && nVersion <= nMaxVer &&
                 (setSubVer.empty() || setSubVer.count(strSubVerIn)));
@@ -1528,7 +1533,7 @@ public:
 
     bool AppliesToMe() const
     {
-        return AppliesTo(VERSION, ::pszSubVer);
+        return AppliesTo(PROTOCOL_VERSION, FormatSubVersion(CLIENT_NAME, CLIENT_VERSION, std::vector<std::string>()));
     }
 
     bool RelayTo(CNode* pnode) const
diff --git a/src/net.cpp b/src/net.cpp
index 50d28913..7d2f18b2 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -727,6 +727,21 @@ void CNode::Cleanup()
 }
 
 
+void CNode::PushVersion()
+{
+    /// when NTP implemented, change to just nTime = GetAdjustedTime()
+    int64 nTime = (fInbound ? GetAdjustedTime() : GetTime());
+    CAddress addrYou = (fUseProxy ? CAddress("0.0.0.0") : addr);
+    CAddress addrMe = (fUseProxy ? CAddress("0.0.0.0") : addrLocalHost);
+    RAND_bytes((unsigned char*)&nLocalHostNonce, sizeof(nLocalHostNonce));
+    PushMessage("version", PROTOCOL_VERSION, nLocalServices, nTime, addrYou, addrMe,
+                nLocalHostNonce, FormatSubVersion(CLIENT_NAME, CLIENT_VERSION, std::vector<string>()), nBestHeight);
+}
+
+
+
+
+
 std::map<unsigned int, int64> CNode::setBanned;
 CCriticalSection CNode::cs_setBanned;
 
diff --git a/src/net.h b/src/net.h
index 03da382d..c2637dc6 100644
--- a/src/net.h
+++ b/src/net.h
@@ -355,18 +355,8 @@ public:
 
 
 
-    void PushVersion()
-    {
-        /// when NTP implemented, change to just nTime = GetAdjustedTime()
-        int64 nTime = (fInbound ? GetAdjustedTime() : GetTime());
-        CAddress addrYou = (fUseProxy ? CAddress("0.0.0.0") : addr);
-        CAddress addrMe = (fUseProxy ? CAddress("0.0.0.0") : addrLocalHost);
-        RAND_bytes((unsigned char*)&nLocalHostNonce, sizeof(nLocalHostNonce));
-        PushMessage("version", VERSION, nLocalServices, nTime, addrYou, addrMe,
-                    nLocalHostNonce, std::string(pszSubVer), nBestHeight);
-    }
-
 
+    void PushVersion();
 
 
     void PushMessage(const char* pszCommand)
diff --git a/src/serialize.h b/src/serialize.h
index efa59808..d3f6b7d7 100644
--- a/src/serialize.h
+++ b/src/serialize.h
@@ -60,9 +60,7 @@ class CDataStream;
 class CAutoFile;
 static const unsigned int MAX_SIZE = 0x02000000;
 
-static const int VERSION = 59900;
-static const char* pszSubVer = "";
-static const bool VERSION_IS_BETA = true;
+static const int PROTOCOL_VERSION = 60000;
 
 // Used to bypass the rule against non-const reference to temporary
 // where it makes sense with wrappers such as CFlatData or CTxDB
@@ -91,7 +89,7 @@ enum
 };
 
 #define IMPLEMENT_SERIALIZE(statements)    \
-    unsigned int GetSerializeSize(int nType=0, int nVersion=VERSION) const  \
+    unsigned int GetSerializeSize(int nType=0, int nVersion=PROTOCOL_VERSION) const  \
     {                                           \
         CSerActionGetSerializeSize ser_action;  \
         const bool fGetSize = true;             \
@@ -105,7 +103,7 @@ enum
         return nSerSize;                        \
     }                                           \
     template<typename Stream>                   \
-    void Serialize(Stream& s, int nType=0, int nVersion=VERSION) const  \
+    void Serialize(Stream& s, int nType=0, int nVersion=PROTOCOL_VERSION) const  \
     {                                           \
         CSerActionSerialize ser_action;         \
         const bool fGetSize = false;            \
@@ -115,7 +113,7 @@ enum
         {statements}                            \
     }                                           \
     template<typename Stream>                   \
-    void Unserialize(Stream& s, int nType=0, int nVersion=VERSION)  \
+    void Unserialize(Stream& s, int nType=0, int nVersion=PROTOCOL_VERSION)  \
     {                                           \
         CSerActionUnserialize ser_action;       \
         const bool fGetSize = false;            \
@@ -362,43 +360,43 @@ template<typename Stream, typename C> void Unserialize(Stream& is, std::basic_st
 // vector
 template<typename T, typename A> unsigned int GetSerializeSize_impl(const std::vector<T, A>& v, int nType, int nVersion, const boost::true_type&);
 template<typename T, typename A> unsigned int GetSerializeSize_impl(const std::vector<T, A>& v, int nType, int nVersion, const boost::false_type&);
-template<typename T, typename A> inline unsigned int GetSerializeSize(const std::vector<T, A>& v, int nType, int nVersion=VERSION);
+template<typename T, typename A> inline unsigned int GetSerializeSize(const std::vector<T, A>& v, int nType, int nVersion=PROTOCOL_VERSION);
 template<typename Stream, typename T, typename A> void Serialize_impl(Stream& os, const std::vector<T, A>& v, int nType, int nVersion, const boost::true_type&);
 template<typename Stream, typename T, typename A> void Serialize_impl(Stream& os, const std::vector<T, A>& v, int nType, int nVersion, const boost::false_type&);
-template<typename Stream, typename T, typename A> inline void Serialize(Stream& os, const std::vector<T, A>& v, int nType, int nVersion=VERSION);
+template<typename Stream, typename T, typename A> inline void Serialize(Stream& os, const std::vector<T, A>& v, int nType, int nVersion=PROTOCOL_VERSION);
 template<typename Stream, typename T, typename A> void Unserialize_impl(Stream& is, std::vector<T, A>& v, int nType, int nVersion, const boost::true_type&);
 template<typename Stream, typename T, typename A> void Unserialize_impl(Stream& is, std::vector<T, A>& v, int nType, int nVersion, const boost::false_type&);
-template<typename Stream, typename T, typename A> inline void Unserialize(Stream& is, std::vector<T, A>& v, int nType, int nVersion=VERSION);
+template<typename Stream, typename T, typename A> inline void Unserialize(Stream& is, std::vector<T, A>& v, int nType, int nVersion=PROTOCOL_VERSION);
 
 // others derived from vector
-extern inline unsigned int GetSerializeSize(const CScript& v, int nType, int nVersion=VERSION);
-template<typename Stream> void Serialize(Stream& os, const CScript& v, int nType, int nVersion=VERSION);
-template<typename Stream> void Unserialize(Stream& is, CScript& v, int nType, int nVersion=VERSION);
+extern inline unsigned int GetSerializeSize(const CScript& v, int nType, int nVersion=PROTOCOL_VERSION);
+template<typename Stream> void Serialize(Stream& os, const CScript& v, int nType, int nVersion=PROTOCOL_VERSION);
+template<typename Stream> void Unserialize(Stream& is, CScript& v, int nType, int nVersion=PROTOCOL_VERSION);
 
 // pair
-template<typename K, typename T> unsigned int GetSerializeSize(const std::pair<K, T>& item, int nType, int nVersion=VERSION);
-template<typename Stream, typename K, typename T> void Serialize(Stream& os, const std::pair<K, T>& item, int nType, int nVersion=VERSION);
-template<typename Stream, typename K, typename T> void Unserialize(Stream& is, std::pair<K, T>& item, int nType, int nVersion=VERSION);
+template<typename K, typename T> unsigned int GetSerializeSize(const std::pair<K, T>& item, int nType, int nVersion=PROTOCOL_VERSION);
+template<typename Stream, typename K, typename T> void Serialize(Stream& os, const std::pair<K, T>& item, int nType, int nVersion=PROTOCOL_VERSION);
+template<typename Stream, typename K, typename T> void Unserialize(Stream& is, std::pair<K, T>& item, int nType, int nVersion=PROTOCOL_VERSION);
 
 // 3 tuple
-template<typename T0, typename T1, typename T2> unsigned int GetSerializeSize(const boost::tuple<T0, T1, T2>& item, int nType, int nVersion=VERSION);
-template<typename Stream, typename T0, typename T1, typename T2> void Serialize(Stream& os, const boost::tuple<T0, T1, T2>& item, int nType, int nVersion=VERSION);
-template<typename Stream, typename T0, typename T1, typename T2> void Unserialize(Stream& is, boost::tuple<T0, T1, T2>& item, int nType, int nVersion=VERSION);
+template<typename T0, typename T1, typename T2> unsigned int GetSerializeSize(const boost::tuple<T0, T1, T2>& item, int nType, int nVersion=PROTOCOL_VERSION);
+template<typename Stream, typename T0, typename T1, typename T2> void Serialize(Stream& os, const boost::tuple<T0, T1, T2>& item, int nType, int nVersion=PROTOCOL_VERSION);
+template<typename Stream, typename T0, typename T1, typename T2> void Unserialize(Stream& is, boost::tuple<T0, T1, T2>& item, int nType, int nVersion=PROTOCOL_VERSION);
 
 // 4 tuple
-template<typename T0, typename T1, typename T2, typename T3> unsigned int GetSerializeSize(const boost::tuple<T0, T1, T2, T3>& item, int nType, int nVersion=VERSION);
-template<typename Stream, typename T0, typename T1, typename T2, typename T3> void Serialize(Stream& os, const boost::tuple<T0, T1, T2, T3>& item, int nType, int nVersion=VERSION);
-template<typename Stream, typename T0, typename T1, typename T2, typename T3> void Unserialize(Stream& is, boost::tuple<T0, T1, T2, T3>& item, int nType, int nVersion=VERSION);
+template<typename T0, typename T1, typename T2, typename T3> unsigned int GetSerializeSize(const boost::tuple<T0, T1, T2, T3>& item, int nType, int nVersion=PROTOCOL_VERSION);
+template<typename Stream, typename T0, typename T1, typename T2, typename T3> void Serialize(Stream& os, const boost::tuple<T0, T1, T2, T3>& item, int nType, int nVersion=PROTOCOL_VERSION);
+template<typename Stream, typename T0, typename T1, typename T2, typename T3> void Unserialize(Stream& is, boost::tuple<T0, T1, T2, T3>& item, int nType, int nVersion=PROTOCOL_VERSION);
 
 // map
-template<typename K, typename T, typename Pred, typename A> unsigned int GetSerializeSize(const std::map<K, T, Pred, A>& m, int nType, int nVersion=VERSION);
-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=VERSION);
-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=VERSION);
+template<typename K, typename T, typename Pred, typename A> unsigned int GetSerializeSize(const std::map<K, T, Pred, A>& m, int nType, int nVersion=PROTOCOL_VERSION);
+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=PROTOCOL_VERSION);
+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=PROTOCOL_VERSION);
 
 // set
-template<typename K, typename Pred, typename A> unsigned int GetSerializeSize(const std::set<K, Pred, A>& m, int nType, int nVersion=VERSION);
-template<typename Stream, typename K, typename Pred, typename A> void Serialize(Stream& os, const std::set<K, Pred, A>& m, int nType, int nVersion=VERSION);
-template<typename Stream, typename K, typename Pred, typename A> void Unserialize(Stream& is, std::set<K, Pred, A>& m, int nType, int nVersion=VERSION);
+template<typename K, typename Pred, typename A> unsigned int GetSerializeSize(const std::set<K, Pred, A>& m, int nType, int nVersion=PROTOCOL_VERSION);
+template<typename Stream, typename K, typename Pred, typename A> void Serialize(Stream& os, const std::set<K, Pred, A>& m, int nType, int nVersion=PROTOCOL_VERSION);
+template<typename Stream, typename K, typename Pred, typename A> void Unserialize(Stream& is, std::set<K, Pred, A>& m, int nType, int nVersion=PROTOCOL_VERSION);
 
 
 
@@ -411,19 +409,19 @@ template<typename Stream, typename K, typename Pred, typename A> void Unserializ
 // Thanks to Boost serialization for this idea.
 //
 template<typename T>
-inline unsigned int GetSerializeSize(const T& a, long nType, int nVersion=VERSION)
+inline unsigned int GetSerializeSize(const T& a, long nType, int nVersion=PROTOCOL_VERSION)
 {
     return a.GetSerializeSize((int)nType, nVersion);
 }
 
 template<typename Stream, typename T>
-inline void Serialize(Stream& os, const T& a, long nType, int nVersion=VERSION)
+inline void Serialize(Stream& os, const T& a, long nType, int nVersion=PROTOCOL_VERSION)
 {
     a.Serialize(os, (int)nType, nVersion);
 }
 
 template<typename Stream, typename T>
-inline void Unserialize(Stream& is, T& a, long nType, int nVersion=VERSION)
+inline void Unserialize(Stream& is, T& a, long nType, int nVersion=PROTOCOL_VERSION)
 {
     a.Unserialize(is, (int)nType, nVersion);
 }
@@ -857,39 +855,39 @@ public:
     typedef vector_type::const_iterator   const_iterator;
     typedef vector_type::reverse_iterator reverse_iterator;
 
-    explicit CDataStream(int nTypeIn=SER_NETWORK, int nVersionIn=VERSION)
+    explicit CDataStream(int nTypeIn=SER_NETWORK, int nVersionIn=PROTOCOL_VERSION)
     {
         Init(nTypeIn, nVersionIn);
     }
 
-    CDataStream(const_iterator pbegin, const_iterator pend, int nTypeIn=SER_NETWORK, int nVersionIn=VERSION) : vch(pbegin, pend)
+    CDataStream(const_iterator pbegin, const_iterator pend, int nTypeIn=SER_NETWORK, int nVersionIn=PROTOCOL_VERSION) : vch(pbegin, pend)
     {
         Init(nTypeIn, nVersionIn);
     }
 
 #if !defined(_MSC_VER) || _MSC_VER >= 1300
-    CDataStream(const char* pbegin, const char* pend, int nTypeIn=SER_NETWORK, int nVersionIn=VERSION) : vch(pbegin, pend)
+    CDataStream(const char* pbegin, const char* pend, int nTypeIn=SER_NETWORK, int nVersionIn=PROTOCOL_VERSION) : vch(pbegin, pend)
     {
         Init(nTypeIn, nVersionIn);
     }
 #endif
 
-    CDataStream(const vector_type& vchIn, int nTypeIn=SER_NETWORK, int nVersionIn=VERSION) : vch(vchIn.begin(), vchIn.end())
+    CDataStream(const vector_type& vchIn, int nTypeIn=SER_NETWORK, int nVersionIn=PROTOCOL_VERSION) : vch(vchIn.begin(), vchIn.end())
     {
         Init(nTypeIn, nVersionIn);
     }
 
-    CDataStream(const std::vector<char>& vchIn, int nTypeIn=SER_NETWORK, int nVersionIn=VERSION) : vch(vchIn.begin(), vchIn.end())
+    CDataStream(const std::vector<char>& vchIn, int nTypeIn=SER_NETWORK, int nVersionIn=PROTOCOL_VERSION) : vch(vchIn.begin(), vchIn.end())
     {
         Init(nTypeIn, nVersionIn);
     }
 
-    CDataStream(const std::vector<unsigned char>& vchIn, int nTypeIn=SER_NETWORK, int nVersionIn=VERSION) : vch((char*)&vchIn.begin()[0], (char*)&vchIn.end()[0])
+    CDataStream(const std::vector<unsigned char>& vchIn, int nTypeIn=SER_NETWORK, int nVersionIn=PROTOCOL_VERSION) : vch((char*)&vchIn.begin()[0], (char*)&vchIn.end()[0])
     {
         Init(nTypeIn, nVersionIn);
     }
 
-    void Init(int nTypeIn=SER_NETWORK, int nVersionIn=VERSION)
+    void Init(int nTypeIn=SER_NETWORK, int nVersionIn=PROTOCOL_VERSION)
     {
         nReadPos = 0;
         nType = nTypeIn;
@@ -1103,7 +1101,7 @@ public:
     }
 
     template<typename Stream>
-    void Serialize(Stream& s, int nType=0, int nVersion=VERSION) const
+    void Serialize(Stream& s, int nType=0, int nVersion=PROTOCOL_VERSION) const
     {
         // Special case: stream << stream concatenates like stream += stream
         if (!vch.empty())
@@ -1212,7 +1210,7 @@ public:
 
     typedef FILE element_type;
 
-    CAutoFile(FILE* filenew=NULL, int nTypeIn=SER_DISK, int nVersionIn=VERSION)
+    CAutoFile(FILE* filenew=NULL, int nTypeIn=SER_DISK, int nVersionIn=PROTOCOL_VERSION)
     {
         file = filenew;
         nType = nTypeIn;
diff --git a/src/uint256.h b/src/uint256.h
index 3e202013..b6132822 100644
--- a/src/uint256.h
+++ b/src/uint256.h
@@ -364,19 +364,19 @@ public:
     }
 
 
-    unsigned int GetSerializeSize(int nType=0, int nVersion=VERSION) const
+    unsigned int GetSerializeSize(int nType=0, int nVersion=PROTOCOL_VERSION) const
     {
         return sizeof(pn);
     }
 
     template<typename Stream>
-    void Serialize(Stream& s, int nType=0, int nVersion=VERSION) const
+    void Serialize(Stream& s, int nType=0, int nVersion=PROTOCOL_VERSION) const
     {
         s.write((char*)pn, sizeof(pn));
     }
 
     template<typename Stream>
-    void Unserialize(Stream& s, int nType=0, int nVersion=VERSION)
+    void Unserialize(Stream& s, int nType=0, int nVersion=PROTOCOL_VERSION)
     {
         s.read((char*)pn, sizeof(pn));
     }
diff --git a/src/util.cpp b/src/util.cpp
index 236c7f7c..ef276e51 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -4,6 +4,7 @@
 // file license.txt or http://www.opensource.org/licenses/mit-license.php.
 #include "headers.h"
 #include "strlcpy.h"
+#include <boost/algorithm/string/join.hpp>
 #include <boost/program_options/detail/config_file.hpp>
 #include <boost/program_options/parsers.hpp>
 #include <boost/filesystem.hpp>
@@ -1001,7 +1002,7 @@ string FormatVersion(int nVersion)
 
 string FormatFullVersion()
 {
-    string s = FormatVersion(VERSION) + pszSubVer;
+    string s = FormatVersion(CLIENT_VERSION);
     if (VERSION_IS_BETA) {
         s += "-";
         s += _("beta");
@@ -1009,6 +1010,17 @@ string FormatFullVersion()
     return s;
 }
 
+// Format the subversion field according to BIP 14 spec (https://en.bitcoin.it/wiki/BIP_0014)
+std::string FormatSubVersion(const std::string& name, int nClientVersion, const std::vector<std::string>& comments)
+{
+    std::ostringstream ss;
+    ss << "/";
+    ss << name << ":" << FormatVersion(nClientVersion);
+    if (!comments.empty())
+        ss << "(" << boost::algorithm::join(comments, "; ") << ")";
+    ss << "/";
+    return ss.str();
+}
 
 
 
diff --git a/src/util.h b/src/util.h
index 7b7eaf6d..d9a0841a 100644
--- a/src/util.h
+++ b/src/util.h
@@ -204,7 +204,7 @@ void SetMockTime(int64 nMockTimeIn);
 int64 GetAdjustedTime();
 void AddTimeData(unsigned int ip, int64 nTime);
 std::string FormatFullVersion();
-
+std::string FormatSubVersion(const std::string& name, int nClientVersion, const std::vector<std::string>& comments);
 
 
 
@@ -558,7 +558,7 @@ inline uint256 Hash(const T1 p1begin, const T1 p1end,
 }
 
 template<typename T>
-uint256 SerializeHash(const T& obj, int nType=SER_GETHASH, int nVersion=VERSION)
+uint256 SerializeHash(const T& obj, int nType=SER_GETHASH, int nVersion=PROTOCOL_VERSION)
 {
     // Most of the time is spent allocating and deallocating CDataStream's
     // buffer.  If this ever needs to be optimized further, make a CStaticStream