> For the complete documentation index, see [llms.txt](https://chusdrter.gitbook.io/control-watch/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://chusdrter.gitbook.io/control-watch/evidence.md).

# Evidence and retention

Evidence is read from public RPC events and transaction metadata. Event queries are paged in bounded batches, matched by verified topic segments, and resolved to transaction hashes when available. The observer records the RPC retention floor and uses ledger metadata when an explicit health value is unavailable.

Unavailable evidence is reported as `UNMEASURABLE`; it is never converted into a finding. The event reader stops after its configured page ceiling and returns an operational error instead of looping indefinitely.

Source of truth: `pkg/evidence` and `docs/detectors.md`.