public String send(Transaction tx) throws IOException {
        return parse(exec(request(tx)), "id").asText();
    }
public String send ( Transaction tx ) throws IOException { return parse ( exec ( request ( tx ) ) , "id" ) . asText ( ) ; }
Sends a signed object and returns its ID.

@param tx signed object (as created by static methods in Transaction class)
@return Transaction ID
@throws IOException