# 1X World Model revision history

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

Brain: [1X World Model](/brains/1x-world-model.md)

## Recorded posture

- First recorded event: 2026-05-28
- Last material change: 2026-05-28
- Last editorial change: 2026-06-05
- Material event count: 1
- Editorial event count: 1

## Material events (1)

- **2026-05-28**: created (source: baseline:arc-g)

## Editorial events (1)

- **2026-06-05**: field_updated on `developer_sources`

## 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.

_Canonical URL: /brains/1x-world-model/history. REST: /v1/brains/2a9a6453-80ba-46e7-adcb-4b7e77311d42/history. HTML: [/brains/1x-world-model/history](/brains/1x-world-model/history)._