Drop the file you were sent. It is checked on this device — nothing
is uploaded, no account is needed, and this page works with your network disconnected. You are
not being asked to trust us; you are checking the file against the commitment it carries.
What this proves. Every part shown as verified is byte-identical to what was sealed.
Withheld parts are still committed, so nothing could be quietly removed and nothing added. What
it does not prove is that the right things were withheld — that is a judgement about the
redaction, not about the file.