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
How it works
A simple three-step process to secure your creations
Select your file
Drag and drop any file. It stays on your computer, only its fingerprint is calculated.
Fingerprint calculation
A unique SHA-256 hash is calculated locally in your browser. Your file remains private.
Blockchain anchoring
The fingerprint is timestamped via OpenTimestamps and permanently anchored on Bitcoin.
Why LegalStamp ?
The simplest and most secure solution to prove the priority of your creations
Ultra fast
Timestamp a document in less than 30 seconds. Blockchain confirmation in 1-24h.
Maximum security
Your file never leaves your computer. We only store the SHA-256 fingerprint.
Independent verification
Proofs verifiable independently via OpenTimestamps and the Bitcoin blockchain.
Global validity
An internationally recognized proof, based on the Bitcoin blockchain.
Guaranteed permanence
Your proofs are permanently anchored on the blockchain, with no time limit.
Legal value
Recognized by the Marseille Judicial Court as proof of priority.
They trust us
Demanding profiles for reliable and fast proofs of priority
Photographers & studios
Protect your shots before publication and secure your copyrights.
Inventors & startups
Prove the priority of an idea or prototype in minutes.
Lawyers & legal professionals
Strengthen your cases with verifiable timestamped proofs.
Transparent pricing
Start for free, upgrade as you need
Solo
- 200 timestamps / month
- Legal PDF certificate
- Proof history
- Email support
Recognized legal value
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.
LegalStamp does not replace an official filing (INPI, Soleau envelope) but complements it by offering a quick and accessible solution.
Ready to protect your creations?
Join thousands of users who trust LegalStamp to secure their documents.