A document management system answers: Where is the file?
An evidence system must answer more difficult questions:
- What claim does this file support?
- Which exact page, field, event, or signature is relevant?
- Who supplied the source?
- Is the source primary, derived, or manually asserted?
- Does another record contradict it?
- Is the evidence sufficient for this review purpose?
The evidence chain
A defensible evidence chain separates at least four layers:
- Source artifact — the original invoice, contract, bill of lading, message, or system record.
- Extracted fact — a structured value such as amount, date, party, quantity, or shipment reference.
- Evidence link — the relationship between the fact and the exact source location.
- Review interpretation — a bounded conclusion or unresolved question for a human reviewer.
Collapsing these layers creates false certainty. Keeping them separate makes corrections, disputes, and audits possible.
Why AI increases the need for provenance
AI can extract and summarize quickly, but fluency is not proof. Every material claim should remain traceable to its source, and uncertainty should be visible rather than silently converted into a confident statement.