{"ok":true,"verified_count":500,"rows_examined":500,"tip_seq":29653,"first_seq_checked":29154,"failed_at_seq":null,"error":null,"timestamp":"2026-05-31T22:29:06.554635+00:00","promise":"Verified the last 500 audit_log rows form an unbroken HMAC chain. Each row's previous_hmac matched the prior row's entry_hmac. Anyone can re-run this check at /api/v1/proof/verify-chain — no auth required."}