About LegalStamp

We help creators, businesses, and legal professionals prove the priority of their documents in seconds using the Bitcoin blockchain.

Our mission

LegalStamp makes legal timestamping simple, fast, and transparent. We use the OpenTimestamps protocol to anchor a cryptographic fingerprint of your files in the Bitcoin blockchain, without ever storing the document itself.

Our ambition is to democratize reliable proof of existence, complementary to traditional approaches (INPI, Soleau envelope), with a smooth user experience and a strong commitment to confidentiality.

What sets us apart

  • Total privacy: the file stays on your device.
  • Verifiable and independent proof on Bitcoin.
  • Clear pricing, freemium and no commitment.

Legal credibility

In March 2025, the Marseille Judicial Court recognized the evidentiary value of a Bitcoin blockchain timestamp to establish the priority of a creation. This event confirms the relevance of proof based on OpenTimestamps.

Contact us

A question or specific need? Write to us at [email protected].