For advisory firms, law firms and compliance teams
“I never got it” is no longer your problem.
You have to be able to prove every client received their GDPR, health-and-safety or AML notice. With CODEX, every delivery is sealed with its date and anyone can check it.
This is a sealed document. Try changing it.
Notice
From your firm, to your client
No. 2026-044GDPR information, art. 13
| Opened | 12/09/2026 · 10:42 |
| Accepted | 12/09/2026 · 10:45 |
The receipt records the exact version, date, IP and agent.
Authentic. This is the document sent on 12 September 2026, down to the last comma.
Altered. This is no longer the document that was sent: its fingerprint doesn’t match.
- Fingerprint of the original
- …
- Fingerprint of this one
- …
The SHA-256 fingerprint is really computed, here, in your browser: that’s how CODEX checks a document, in 3 seconds.
For health and safety, HR and compliance
Delivery has to be proven too. Not just the document.
In an inspection or in court, the question is rarely whether the document existed: it is whether the person received it, when, and whether you can prove it. An email sent is not an email read.
Receipts with a provable date
Every acknowledgement leaves a sealed receipt with its moment anchored in Bitcoin. We do not set that date: a public chain nobody controls does.
See who is missing
The status of a circular is visible at a glance: who has read it and who has not. Reminders go out on their own, with nobody chased down a corridor.
One link, not twenty attachments
If the policy changes, the link shows the version in force and the history stays. Nobody is left working from last year’s PDF.
Does any of this sound familiar?
“That’s not what we agreed”
The quote or the terms change version and no one knows which one was right. Here every version is sealed with its date: you can see which one you sent and which one your client accepted.
“It never reached me”
You send a document and later they say they never got it. Here you know when it was opened, and the acceptance or rejection is recorded.
“This degree is fake”
With AI, forging a PDF takes minutes. A sealed document can’t be changed without it showing: if anyone touches a single letter, the check says so.
How it works
Upload or create
Upload the PDF you already have, or create it from a template.
Seal it
Its fingerprint and its date are fixed. From that moment on, any change shows.
Send the link
By email or WhatsApp. Your client opens it, downloads it and checks it without an account.
This certificate doesn’t exist.
And you can’t tell.
An AI generated it in seconds —the institute, the person, the gold seal, even the signatures. To the eye it’s perfect. That’s why an invoice, a contract or a diploma that “looks authentic” no longer proves anything.
The difference between this and a real one is no longer visible: it’s proven. CODEX adds to every document you issue a cryptographic proof —anchored in Bitcoin, which exposes any change— and turns the absence of proof into the warning sign. The real thing carries proof. What doesn’t, distrust it.
Real recording · unedited
This is the check.
Three seconds.
You drop the PDF. Your browser computes the hash and checks it against the Bitcoin chain. The file never leaves your device, and the answer does not come from us.
Recorded against the live site. You can repeat it right now with any document: check a document →
How it works inside
Every document has a unique SHA-256: its fingerprint, which changes if a single letter changes. That SHA-256, anchored in Bitcoin’s public chain with OpenTimestamps, fixes its date: not even we could change it.
The method is an open standard: anyone can check it without AIM CODEX. What sets it apart.
Start today, free
Free, with unlimited documents. From €2.99 a month billed annually, with your brand and your domain.