new version of from to trick protobuf ?

pb/messages.proto

@@ -133,7 +133,9 @@ message PackedUserMessage {
 	string destination=1; // the peer's current conversation lookup public key
     bytes payload=2;  // the message UserMessage encrypted with the destination peer's public key
 	bytes signature=3; // the payload signature with the client identity private key
-    repeated int64 serverTimestamp=4; // server time stamp, might be several in matriochka mode
+    string signature_public_key=4; // the sender public key for the signature
+    repeated int64 serverTimestamp=5; // server time stamp, might be several in matriochka mode
+
 }
 
 message ConversationStatus {