# Offline Verification and Online Trust Checks Solve Different Problems

Offline checks can prove exact-state integrity. Online checks can add current registry, revocation, timestamp or transparency evidence when explicitly requested.

## Verification boundary

Structure, exact-state integrity, signature validity, signer identity, trusted time and current status are separate questions. Integrity does not prove content truth. A claimed identity inside a document is not independent identity evidence.

Canonical source: https://universaldocument.org/verify/articles/offline-vs-online