40:    private const FORMAT_VERSION = 'v2';
78:        if ($version !== self::FORMAT_VERSION) {
100:        $actualHmac = hash_hmac('sha256', $value, Security::getNonceKey());
101:        if (!hash_equals($expectedHmac, $actualHmac)) {
119:        $hmac = hash_hmac('sha256', $serialized, Security::getNonceKey());
121:        $payload = self::FORMAT_VERSION . "\n"