The file is hashed in your browser — it never leaves your device.
Verify a document
Every event on a document becomes a signed claim in a tamper-evident ledger. Anyone holding the file can confirm it is genuine and unaltered — from the QR, in their own browser, without an account.
Drop the finished document — the sealed PDF that carries the QR code. The unsigned original and any earlier version are recognised too; a re-saved or edited copy will not match.