Certificates checked
in one click. And revocable.
You issue 300 diplomas at once. Each carries its code and its proof. Whoever receives it —or hires them— checks it's real without calling you. And if one must be revoked, it is: anyone checking later will see it.
Certificate of achievement
Occupational health and safety
30 hours · September 2026
Laura Méndez
CRED-W3B4ZL4W
Valid. Whoever receives it checks it in one click, without calling the school.
The full cycle
You issue in bulk
A list of students and a title. Each diploma comes with its code —
CRED-W3B4ZL4W— and its sealed hash.
The holder shares it
A link that opens anywhere. No account, no app, no asking you for permission.
Anyone can check it
A hiring company verifies in seconds that the certificate exists and hasn't been altered. Without calling your school.
And it can be revoked
If a certificate is revoked, anyone checking later sees it revoked. It can also be reinstated if it was a mistake.
Why this matters
And in the format everyone understands
Each credential can also be read as a W3C Verifiable Credential: the standard wallets and verifiers understand. No account, no cost, with the Bitcoin proof inside. See how →
A PDF with your logo proves nothing
Anyone replicates it in minutes, now in seconds with AI. If your certificate is just a nice PDF, it doesn't tell your student from whoever forged it.
And you're left answering calls
«Is this certificate real?» Every check is a call, an email, someone digging through an archive. Here they check it themselves.
The proof doesn't depend on us
Each diploma carries its proof inside, anchored in Bitcoin. Still verifiable in ten years, whether CODEX exists or not.
Who it's for
Training centres, academies, professional bodies, companies certifying internal skills, course and conference organisers.
Issue a test diploma See pricing