	public static function commented( string $username, string $code ) {
		$username = strtolower($username);
		// Step 20, 21
		$comments = file_get_contents(sprintf(SOA2_COMMENTS_API, $username, rand()));
		$matches = [];
		preg_match_all(SOA2_COMMENTS_REGEX, $comments, $matches, PREG_PATTERN_ORDER);
		for ($i = 0; $i < count($matches[0]); ++$i) {
			if (strtolower($matches[1][$i]) != $username) continue;
			if (hash_equals($code, $matches[2][$i])) return true; // Step 22
		}
		return false;
	}