The 5 October 2026 check is signed and sealed.

{"event":"observation_digest","format_version":1,"observation_digest":{"date":"2026-10-05","failed":1,"files":[{"path":"observations/2026/10/05/GautamTalksDev--canary.jsonl","sha256":"a17548601b555567c50340fb271f4d537288344115493707ec5c4f2e75578452"},{"path":"observations/2026/10/05/actions--ai-inference.jsonl","sha256":"ffaa2f8307d55a0f88264816572ca765f9d66ed400df5e74db4d55c47a533d71"},{"path":"observations/2026/10/05/actions--attest-build-provenance.jsonl","sha256":"e52850b7e7a8c69ad5ea782345a4341ec0a0d60689f38b9096a59261e807eca4"},{"path":"observations/2026/10/05/actions--attest.jsonl","sha256":"118e45dfeafba6c13a560038da86f3592cf681658bd246a792c06c6a2a26712c"},{"path":"observations/2026/10/05/actions--cache.jsonl","sha256":"33f10fc84bbbb7b6f0f070c12e5249b0cac8f584975c50d0ed8cb50e1ca5e60e"},{"path":"observations/2026/10/05/actions--checkout.jsonl","sha256":"54863c2af8abe0574e170d75281b7f95e1197961e9bde7c9f035804063468c7f"},{"path":"observations/2026/10/05/actions--dependency-review-action.jsonl","sha256":"3e73317c78ed0aef053025d26662169a5a69a2ce91aa1db451c21d1422cad669"},{"path":"observations/2026/10/05/actions--download-artifact.jsonl","sha256":"fc358f198a0c697547fcc9fab58d23c6…

The SHA-256 of these bytes is this entry's hash (2dacddfa). The next entry begins with it. Change one byte, and the chain breaks.