= time();
$valid_work = ctype_digit($counter) &&
(tf_fnv1a($nonce . ':' . $counter) % $DIFFICULTY_MODULUS === 0);
if ($valid_sig && $not_expired && $valid_work) {
setcookie('tf_verified2', $GRANTED_COOKIE_VALUE, time() + 21600, '/', '', true, true);
header('Location: ' . $target, true, 302);
exit;
}
// Falls through to issue a fresh puzzle if verification failed.
}
// --- Path 2: issue a new puzzle ---
$nonce = bin2hex(random_bytes(16));
$expiry = time() + $PUZZLE_LIFETIME;
$sig = hash_hmac('sha256', $nonce . '|' . $expiry, $SECRET);
?>
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