Verify
Check a signed document.
Drop in a signed PDF (or paste its SHA-256 hash) and we'll tell you whether it matches a completed document in XOsign's audit and timestamp chain — when it was signed, and how many people signed it. No account, no trust in us required.
What this proves — and what it doesn't.
A match means the exact bytes you hold were frozen into a completed XOsign document. The SHA-256 you submit is compared against the fingerprint recorded in the signature certificate and signed by an RFC 3161 timestamp authority — change a single byte of the PDF and the hash no longer matches.
It does not reveal the document's content, title, or the identities of its signers. Verification only confirms authenticity and timing; the document itself stays private to its account.
For the strongest independent check, you can also compute the hash yourself — shasum -a 256 document.pdf — and paste the result above.