A QR record and an exact file answer different questions.
A QR can take a recipient to the issuer’s proof record. The recipient can compare the named issuer and registered details with the document in hand. That confirms the record exists; it does not establish that this particular PDF is unchanged.
For that, Kweli checks the digital file against the fingerprint of the final QR-bearing version the issuer registered. Both checks belong in the same workflow.
See the verification steps ↗