Your erasure, dated & signed — without ever handing over the data

Your erasure, sealed and anchored.
Proof that the data no longer exists.

A timestamped and anchored destruction certificate. The day the CNIL, a client or an auditor asks for proof of erasure, you send a link, not a promise.

Seal my destruction certificate — 60 seconds
Try it live · nothing leaves your browser

Seal your certificate, here, now

Drop your certificate here
PDF · JSON · erasure report — the fingerprint is computed locally, nothing leaves
SHA-256 fingerprint
—
✓ SEALED — Ed25519 signature generated in your browser
Your proof link, verifiable by anyone:
✓ sealed
What you get
fingerprint 14b674…39aa
sealed on 2026-10-20T14:30:00Z
signed Ed25519 · anchored Hedera
✓ verifiable by anyone, no account, not by us

How it works

1 · Drop

Your erasure report (certificate, scope, evidence…). The SHA-256 fingerprint is computed on your side — the data never leaves your machine.

2 · We seal

Fingerprint timestamped + anchored on a public ledger (Hedera), continuously. Add your signature (private key / chip).

3 · You keep the proof

A receipt verifiable by anyone, no account, without us. That's your prior-art record.

4 · You defend yourself

Each seal generates a one-click proof link: the platform, a client or a judge opens it and sees the verified signature. No file, no lawyer.

What we prove

WHAT
Existence + integrity

The content existed at that date and hasn't moved since sealing.

WHEN
Timestamp

RFC 3161 timestamping via TSA (qualified eIDAS option). The time that counts is the ledger's.

WHO
Origin

Ed25519 signature in self-custody (or secure chip): cryptographic proof of the author, no intermediary.

WITHOUT
Nothing stored

Zero data with us. Only the fingerprint leaves. Your certificate stays yours, and only yours.

The infringement link

« Your data erasure is being disputed? Paste the URL of the suspicious content. We generate a single link that bundles your prior art, the comparison and your signature. You send it to the platform. 30 seconds, no lawyer. »

Identical copy → the hash matches, the proof is direct. Modified copy (cropped, re-encoded, deepfake) → your origin signature proves what you really sealed.

A fake is circulating online? Prove it.

Proof, not a promise

Real proof — click to verify
fingerprint 14b674…39aa · sealed on 2026-10-20T14:30:00Z · Ed25519 signature · anchored Hedera
Open this proof → signature verified live

Why it's solid

Case law
TJ Marseille, March 20, 2025: blockchain timestamping recognized as proof of prior art and ownership.
Regulation
EU AI Act 2026: transparency and watermarking of synthetic content become mandatory. Provenance becomes the norm.

Pricing

Price
49 € excl. VAT/month
no commitment · seals included · proof vault · infringement links · first seal free

FAQ

How much does Erasure Proof cost?
49 € excl. VAT/month, no commitment. The first seal is free to try.
What exactly does an erasure certificate prove?
That the erasure report existed at that date, has not changed since, and — if signed — who issued it.
Is the erased data stored by 0DATA?
No. Only the fingerprint (SHA-256 hash) is sealed and anchored. The raw data never leaves your machine.
Does this replace GDPR compliance?
No. It is the technical evidence of erasure (GDPR art. 17). Compliance remains your responsibility.
How do I prove erasure to the CNIL or an auditor?
Send the proof link: it shows the timestamped and anchored certificate, verifiable without an account or intermediary.
Seal my destruction certificate Talk to 0DATA
Seal my destruction certificate