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Where a shared document actually shows up

If someone shared a document with your KuduDoc account, it is waiting under Shared with me when you sign in. It is listed with what the sender asked for — View only or May save a copy — and they can take access back later; a withdrawn share stays on the list, marked withdrawn, rather than quietly disappearing.

If what you were sent is a link for checking a document rather than reading it, that is a verification link. It opens the free check page, and there you supply the copy you were sent — drop the PDF in, or paste its SHA-256 fingerprint — and KuduDoc says whether a seal of ours matches those exact bytes. It never hands over the document's contents, and it needs no account. Worth knowing the other way round, though: a fingerprint is not a secret. Anyone who has one can look it up without the file and see the document's title and when it was sealed, so treat a verification link as you would the document's name.

What a KuduDoc seal proves — and what it doesn't

• The file existed on the date its seal records, and hasn't changed by a single byte since.
• Anyone holding a copy can run the same check and get the same answer.
• The certification signature and the OpenTimestamps anchor can both be checked with independent, non-KuduDoc tools.
• It does not mean KuduDoc has checked whether the document is true, accurate or lawful.
• It does not authenticate handwriting, or verify a scan against the paper it came from.
• It does not confirm who the signers are, unless an identity check was attached — that appears in the audit trail when it was.

A seal is a fact about a file, not an endorsement of what the file says. We keep that line bright on purpose.