Doc Notary: prove a file existed, unaltered, at this moment

Doc Notary records a file's SHA-256 fingerprint and a timestamp on a public blockchain, without putting the file itself on-chain. Anyone can verify a copy of the file in their browser, free and without an account. Built for researchers, journals, journalists, documentary makers, freelancers and creators who need evidence of when they had a file.

Free plan: 3 notarizations a month. Standard: US$5/month or US$49/year for 25 notarizations, larger files and history. Currently in beta on the Ethereum Sepolia test network. A proof shows existence at a point in time; it is not a legal notarization and does not prove authorship.

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