Authentication history

Immutable persisted observations.

Observed	Signal	Selector	Verdict	Fingerprint
2026-08-21T18:02:05+00:00	DMARC	—	VALID	`2f8e3a04116c…`
2026-08-21T18:02:05+00:00	SPF	—	INVALID	`e303379716b8…`