# What Exactly Did the Signer Sign?

A reliable signing record should identify the exact document state covered by the signature. A sealed UDS binds verification to exact bytes so a changed copy fails integrity verification.

## How UD approaches the problem

UDR preserves revision lineage. UDS binds verification to an exact final state. BrowserCarrier is offline-readable and zero-install.

## Limitation

Technical provenance does not decide authenticity, relevance, completeness or admissibility.

- Demo: https://universaldocument.org/legal/demo
- Pilot: https://universaldocument.org/legal/pilot