N°01↗
Ultra fast
Timestamp a document in less than 30 seconds. Blockchain confirmation in 1-24h.
VOL. I · Nº 26PUBLIC REGISTER OF DEPOSITS09 MAY 2026DEPOSIT № LS-2026-042847
Legally recognized in France
Certify your documents
on the blockchain.
Create unfalsifiable proofs of priority in seconds. Your file stays private — only its fingerprint is recorded.
✶ 3 free timestamps/month · No card required · GDPR compliant
Active deposit · live
LS-2026-042847
SHA-256BTC ANCHOR
0proofs recorded
§ 01—How it works
Three acts. One proof.
A simple three-step process to secure your creations
ART. 1
I
Select your file
Drag and drop any file. It stays on your computer, only its fingerprint is calculated.
ART. 2
II
Fingerprint calculation
A unique SHA-256 hash is calculated locally in your browser. Your file remains private.
ART. 3
III
Blockchain anchoring
The fingerprint is timestamped via OpenTimestamps and permanently anchored on Bitcoin.
§ 02—Why LegalStamp
Seven guarantees sealed by the chain.
The simplest and most secure solution to prove the priority of your creations
N°02↗
Maximum security
Your file never leaves your computer. We only store the SHA-256 fingerprint.
N°03↗
Independent verification
Proofs verifiable independently via OpenTimestamps and the Bitcoin blockchain.
N°04↗
Global validity
An internationally recognized proof, based on the Bitcoin blockchain.
N°05↗
Guaranteed permanence
Your proofs are permanently anchored on the blockchain, with no time limit.
N°06↗
Legal value
Recognized by the Marseille Judicial Court as proof of priority.
§ 03—Trusted by
Authors, creators, jurists — demanding profiles for reliable and fast proofs of priority
REGULATED PROFESSION · I
Photographers & studios
Protect your shots before publication and secure your copyrights.
INTELLECTUAL PROPERTY · II
Inventors & startups
Prove the priority of an idea or prototype in minutes.
LEGAL PRACTICE · III
Lawyers & legal professionals
Strengthen your cases with verifiable timestamped proofs.
§ 04—Transparent pricing
Schedule of fees.
Start for free, upgrade as you need
ART. I
Free
0€
- 3 timestamps / month
- OpenTimestamps proof (.ots)
- Public verification page
POPULAR
ART. II
Solo
9€/ mois
- 200 timestamps / month
- Legal PDF certificate
- Proof history
- Email support
§ 05—Legal recognition
Recognised by the Marseille Court of Justice.
The decision of the Marseille Judicial Court on March 20, 2025 (RG 23/00046) recognized for the first time in France the evidentiary value of a Bitcoin blockchain timestamp to establish the priority of a creation.
⚠ LEGAL NOTICE
LegalStamp does not replace an official filing (INPI, Soleau envelope) but complements it by offering a quick and accessible solution.
§ 06 · FINAL UNDERTAKING
Ready to protect your creations?
Join thousands of users who trust LegalStamp to secure their documents.
Issued in Paris, on
09 MAY 2026
Signature
