Timestamp evidence so it holds up: prove a file existed and is unaltered.
When a document’s date or integrity is contested, the strongest thing you can show is independent evidence: a fingerprint anchored to a public blockchain that no party — including you — could have backdated or edited.
Why it works here
Disputes turn on when something existed and whether it changed. Emails, contracts, photographs, inspection reports, chat logs — their evidentiary value collapses if the other side can argue they were altered or created after the fact. Blockchain notarization fixes both: the on-chain timestamp shows the file existed by a certain moment, and the fingerprint shows it is byte-for-byte the same file today.
Because the proof is read from a public ledger, opposing parties and tribunals can verify it themselves without trusting you or notaros — exactly the property evidence needs. And because your file is hashed locally and never uploaded, notarizing sensitive material does not expose it.
Common scenarios
Preserve a record before a dispute
Notarize correspondence, logs, or reports as soon as they are created, so their date and integrity are provable later.
Fix a chain-of-custody moment
Anchor a photograph or scan of physical evidence to establish it existed and was unaltered as of a point in time.
Counter a backdating claim
A blockchain timestamp cannot be moved earlier, so an anchored file rebuts allegations that it was fabricated after the fact.
How to notarize for this
Fingerprint your file in your browser, pay $25 in USDC/USDT, and receive a certificate anchored to Base and Bitcoin that anyone can verify independently. Read the full process or the step-by-step guide.