Checks a certificate entirely in your browser, with no internet. Paste the certificate JSON, optionally add the video file, and press Verify. Nothing is sent anywhere.
A green VALID means the signature checks against a pinned
GENYOUINE key and — if you supplied the video — the file's fingerprint matches
the certificate. This page cannot see whether a certificate was later
revoked; revocation is not part of the signed file, so always
confirm it on the online certificate page. The full algorithm is published in
docs/CERTIFICATE_SPEC.md; the pinned keys are listed at
/keys.