# Ultrahuman Ring (Air / Pro) revision history

Append-only Arc G field-change log. Forward-only honesty: events accrue from Arc G adoption.

Model: [Ultrahuman Ring (Air / Pro)](/models/ultrahuman-ring-air.md)

## Recorded posture

- First recorded event: 2026-06-03
- Last material change: 2026-06-03
- Material event count: 1
- Editorial event count: 0

## Material events (1)

- **2026-06-03**: created (source: baseline:arc-g)

## Forward-only note

Arc G is forward-only. The event log accrues from the Arc G adoption point. Fields with no events post-baseline equal the current cached value and are not independently verified at any prior date. To restate a recorded change, write a new event through the updateEntityField chokepoint.

_Canonical URL: /models/ultrahuman-ring-air/history. REST: /v1/models/4a6cb329-1e74-4c96-aa13-801a48a13d99/history. HTML: [/models/ultrahuman-ring-air/history](/models/ultrahuman-ring-air/history)._