X-39 Notaría

Agreements sealed on Bitcoin.

X-39 seals documents and agreements so anyone can verify their exact content and date, without trusting a middleman. Each one is anchored in Bitcoin (via OpenTimestamps) and carries a European qualified timestamp (eIDAS). Signatures use post-quantum ML-DSA-87 (NIST FIPS-204). Free, reproducible and verifiable by anyone, forever.

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