Authenticity and verification
Signature Validity Is Not the Same as Identity Verification
A valid signature proves possession of a private key for a signed state. Real-world identity requires separate, checked binding evidence.
The practical test
Ask what evidence was checked, which algorithm and key were used, whether identity was independently bound to the key, whether time came from a trusted authority, and whether current revocation or supersession status was queried.
A result that was not checked must remain amber or neutral. It must not inherit a green state from a different layer.
Universal Document boundary
UD can carry canonical integrity evidence and related trust material. Integrity alone does not establish authorship, identity, trusted time, legal effect, factual correctness, current status or independent consensus.