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# rateDidChangeOriginatingParticipantKey

A key to retrieve the identifier of the participant that originates the rate change.

```
class let rateDidChangeOriginatingParticipantKey: String
```

## Discussion

The associated value is a UUID of a participant in the playback coordinator’s [`otherParticipants`](/documentation/AVFoundation/AVPlaybackCoordinator/otherParticipants) array.

---

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