Your texts, dated & signed — without ever handing them over

Your manuscript, sealed continuously.
Your proof of prior art, ready — no need to justify yourself.

Prior art and integrity, timestamped and anchored. The day your manuscript resurfaces under another name, you send a link, not a registered letter.

Seal my first text — 60 seconds
Try it live · nothing leaves your browser

Seal your text, here, now

Drop your manuscript here
DOCX · PDF · TXT · RTF · screenplay — 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 text (chapter, scene, synopsis…). The SHA-256 fingerprint is computed on your side — the file 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 text stays yours, and only yours.

The infringement link

« A fake of your text is circulating online? 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 Authors Proof cost?
49 € excl. VAT/month, no commitment. The first seal is free to try.
What exactly does a seal prove?
The existence of the content at a date, its integrity since sealing, and — if signed — its cryptographic origin.
Is my text stored by 0DATA?
No. Only the fingerprint (SHA-256 hash) is sealed and anchored. The raw data never leaves your machine.
Does sealing give me copyright?
No. Copyright arises from creation (Berne Convention). Sealing provides the technical evidence of prior art.
How do I report a fake online?
Paste the URL of the suspicious content: a single proof link bundles your prior art, the comparison and your signature, to send to the platform.
Seal my first text Talk to 0DATA
Seal my first text