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{ "event_id": "uuid", "event_name": "playback.heartbeat", "schema_version": 4, "metric_semantics_version": 7, "event_time": "2026-09-06T12:00:15Z", "client_send_time": "2026-09-06T12:00:17Z", "ingest_time": "2026-09-06T12:00:18Z", "user_or_anon_id": "privacy-scoped-id", "device_id": "rotatable-id", "session_id": "viewer-session", "playback_attempt_id": "attempt-42", "video_id": "video-123", "channel_id": "channel-9", "position_ms": 42000, "played_delta_ms": 15000, "buffered_delta_ms": 0, "playback_state": "PLAYING", "is_live": false, "surface": "HOME", "experiment_assignments": ["exp123:treatment"], "consent": {"analytics": true, "personalization": true}, "client": {"platform": "TV", "app_version": "x.y"}, "network": {"type": "WIFI"}, "trace_id": "trace-abc"}
Playback fields
position_msplayed_delta_msbuffered_delta_msplayback_stateplayed_delta_ms is watch-time evidence. YouTube validates it against position movement, state transitions, buffering, video duration, retry patterns, and traffic-quality signals.
What it means
Playback evidence is the ordered set of player events that shows how one attempt to watch a video actually progressed.
playback_attempt_id groupsevent_id dedupesevent_time ordersplayed_delta_ms measures“Use stable event IDs, group by playback attempt, process in event time, sum only validated played deltas, apply a versioned qualification policy, then certify with complete Bronze history.”