function verifyNonce( $timestamp, $md5 ) {

		// Within range of 5 minutes?
		$within_range = time() - $timestamp;
		if ( $within_range > ( MINUTE_IN_SECONDS * 5 ) ) {
			return false;
		}

		// Correct md5?
		if ( md5( NONCE_KEY . $timestamp ) !== $md5 ) {
			return false;
		}

		return true;
	}