# Why Doesn't the Evidence File Carry Its Own Chain of Custody?

Most files carry content and basic metadata, while custody history is maintained in surrounding systems and records. UD can carry declared provenance with the document; external custody still requires real people, procedures and evidence.

## 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