UD Proof
Free · 3/monthCryptographic proof that your document, idea, or creative work existed at this exact moment. The SHA-256 hash and timestamp live inside the .uds file itself — not in our database.
When proof of existence matters
Prove your screenplay, artwork, music, or writing existed before a dispute arises.
Establish prior art for patent applications without filing a patent first.
Timestamp your concept, strategy, or product design before sharing with investors.
Prove your dataset or results existed at a specific date — before analysis or publication.
Why UD Proof beats alternatives
Proving something existed at a specific moment has historically required lawyers, notaries, or expensive cryptographic timestamping services. UD Proof does it in seconds, for free.
No tamper evidence. Easily backdated or faked. Not admissible in most commercial disputes.
Visual only — the timestamp is a text overlay that can be removed or altered. Not cryptographic.
Typically $10–50 per proof, require crypto wallets, and create platform dependency. Complex for non-technical users.
Free for 3 proofs/month. SHA-256 hash embedded in the .uds file. Mathematically verifiable. No wallet. No account. Proof lives in the document.