question: boolean checkToken ( ByteWrapper token , Key nodeId , InetAddress ip , int port , Key lookupKey ) { updateTokenTimestamps ( ) ; boolean valid = checkToken ( token , nodeId , ip , port , lookupKey , timestampCurrent . get ( ) ) || checkToken ( token , nodeId , ip , port , lookupKey , timestampPrevious ) ; if ( ! valid ) DHT . logDebug ( "Received Invalid token from " + ip . getHostAddress ( ) ) ; return valid ; }
target:  Check if a received token is OK.