diff --git a/src/bitcoinrpc.cpp b/src/bitcoinrpc.cpp
index a93ff3ca..b3c79f67 100644
--- a/src/bitcoinrpc.cpp
+++ b/src/bitcoinrpc.cpp
@@ -230,6 +230,7 @@ static const CRPCCommand vRPCCommands[] =
     { "submitblock",            &submitblock,            false,     false },
     { "listsinceblock",         &listsinceblock,         false,     false },
     { "dumpprivkey",            &dumpprivkey,            true,      false },
+    { "dumppubkey",             &dumppubkey,             false,     false },
     { "dumpwallet",             &dumpwallet,             true,      false },
     { "importprivkey",          &importprivkey,          false,     false },
     { "importwallet",           &importwallet,           false,     false },
@@ -1241,6 +1242,7 @@ Array RPCConvertValues(const std::string &strMethod, const std::vector<std::stri
     if (strMethod == "lockunspent"            && n > 0) ConvertTo<bool>(params[0]);
     if (strMethod == "lockunspent"            && n > 1) ConvertTo<Array>(params[1]);
     if (strMethod == "importprivkey"          && n > 2) ConvertTo<bool>(params[2]);
+    if (strMethod == "importprivkey"          && n > 3) ConvertTo<bool>(params[3]);
     if (strMethod == "verifychain"            && n > 0) ConvertTo<boost::int64_t>(params[0]);
     if (strMethod == "verifychain"            && n > 1) ConvertTo<boost::int64_t>(params[1]);
     if (strMethod == "dhtput"                 && n > 3) ConvertToValue(params[3]);
diff --git a/src/bitcoinrpc.h b/src/bitcoinrpc.h
index 5dc0d06e..071c6a72 100644
--- a/src/bitcoinrpc.h
+++ b/src/bitcoinrpc.h
@@ -146,6 +146,7 @@ extern json_spirit::Value addnode(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value getaddednodeinfo(const json_spirit::Array& params, bool fHelp);
 
 extern json_spirit::Value dumpprivkey(const json_spirit::Array& params, bool fHelp); // in rpcdump.cpp
+extern json_spirit::Value dumppubkey(const json_spirit::Array& params, bool fHelp); // in rpcdump.cpp
 extern json_spirit::Value importprivkey(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value dumpwallet(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value importwallet(const json_spirit::Array& params, bool fHelp);
diff --git a/src/rpcdump.cpp b/src/rpcdump.cpp
index 6c139d6d..f76d5591 100644
--- a/src/rpcdump.cpp
+++ b/src/rpcdump.cpp
@@ -9,6 +9,7 @@
 #include "bitcoinrpc.h"
 #include "ui_interface.h"
 #include "base58.h"
+#include "twister.h"
 
 #include <boost/date_time/posix_time/posix_time.hpp>
 #include <boost/lexical_cast.hpp>
@@ -67,9 +68,9 @@ std::string DecodeDumpString(const std::string &str) {
 
 Value importprivkey(const Array& params, bool fHelp)
 {
-    if (fHelp || params.size() < 2 || params.size() > 3)
+    if (fHelp || params.size() < 2 || params.size() > 4)
         throw runtime_error(
-            "importprivkey <bitcoinprivkey> <username> [rescan=true]\n"
+            "importprivkey <bitcoinprivkey> <username> [rescan=true] [allow_new_user=false]\n"
             "Adds a private key (as returned by dumpprivkey) to your wallet.");
 
     string strSecret = params[0].get_str();
@@ -80,11 +81,24 @@ Value importprivkey(const Array& params, bool fHelp)
     if (params.size() > 2)
         fRescan = params[2].get_bool();
 
+    bool fAllowNewUser = false;
+    if (params.size() > 3)
+        fAllowNewUser = params[3].get_bool();
+
     CBitcoinSecret vchSecret;
     bool fGood = vchSecret.SetString(strSecret);
 
     if (!fGood) throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid private key");
 
+    if( !fAllowNewUser ) {
+        CTransaction txOut;
+        uint256 hashBlock;
+        uint256 userhash = SerializeHash(strUsername);
+        if( !GetTransaction(userhash, txOut, hashBlock) ) {
+            throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "User must exist (or allow_new_user flag must be set)");
+        }
+    }
+
     CKey key = vchSecret.GetKey();
     CPubKey pubkey = key.GetPubKey();
     CKeyID vchAddress = pubkey.GetID();
@@ -211,6 +225,25 @@ Value dumpprivkey(const Array& params, bool fHelp)
     return CBitcoinSecret(vchSecret).ToString();
 }
 
+Value dumppubkey(const Array& params, bool fHelp)
+{
+    if (fHelp || params.size() != 1)
+        throw runtime_error(
+            "dumppubkey <username>\n"
+            "Returns the public key corresponding to <username>.");
+
+    string strUsername = params[0].get_str();
+
+    CPubKey pubkey;
+    bool gotKey = getUserPubKey(strUsername, pubkey);
+
+    if( !gotKey )
+        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Username not found");
+
+    string strPubkey = string( reinterpret_cast<const char *>(pubkey.begin()), pubkey.size());
+    return strPubkey;
+}
+
 
 Value dumpwallet(const Array& params, bool fHelp)
 {
diff --git a/src/twister.cpp b/src/twister.cpp
index 57c21521..428d204c 100644
--- a/src/twister.cpp
+++ b/src/twister.cpp
@@ -1552,7 +1552,7 @@ Value listusernamespartial(const Array& params, bool fHelp)
 {
     if (fHelp || (params.size() < 2 || params.size() > 3))
         throw runtime_error(
-            "listusernamespartial <username_starts_with> <count> [exact_match]\n"
+            "listusernamespartial <username_starts_with> <count> [exact_match=false]\n"
             "get list of usernames starting with");
 
     string userStartsWith = params[0].get_str();
diff --git a/src/twister.h b/src/twister.h
index ef3daaba..913b985d 100644
--- a/src/twister.h
+++ b/src/twister.h
@@ -23,6 +23,7 @@ public:
 void startSessionTorrent(boost::thread_group& threadGroup);
 void stopSessionTorrent();
 
+bool getUserPubKey(std::string const &strUsername, CPubKey &pubkey);
 std::string createSignature(std::string const &strMessage, CKeyID &keyID);
 std::string createSignature(std::string const &strMessage, std::string const &strUsername);
 bool verifySignature(std::string const &strMessage, std::string const &strUsername, std::string const &strSign);