Provenance

Every publicly served fact must trace to evidence. The evidence chain is:

source row -> source document -> claim evidence -> claim -> entity / relationship / fact version -> public response

What public routes can show

Public pages and APIs may show:

• structured claims returned by the query layer;
• citations with sourceDocumentId, URL, and published date;
• source-document metadata returned by get_sources;
• derived snippets only when source policy permits;
• explicit unknown, stale, thin, unavailable, or coverage-gap states.

They must not show raw source bodies.

Bitemporal behavior

Point-in-time reads use both valid-world time and transaction time. For example, verify_claim with as_of_date evaluates the claim against evidence available for that date and returns unverified rather than inventing support when the substrate has no matching cited evidence.

Feedback

Feedback creates review records for operators. It does not mutate canonical claims, entities, relationships, or fact versions.

Contradictions

Contradictions are explicit graph state. verify_claim uses recorded contradiction state and deterministic matching over cited evidence; it does not ask an LLM to decide unsupported facts from scratch.