# Zipline Platform 2 (P2) revision history

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

Model: [Zipline Platform 2 (P2)](/models/zipline-platform-2.md)

## Recorded posture

- First recorded event: 2026-05-31
- Last material change: 2026-05-31
- Material event count: 1
- Editorial event count: 0

## Material events (1)

- **2026-05-31**: 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/zipline-platform-2/history. REST: /v1/models/a2e6c165-004d-43ff-a411-29e794733ff1/history. HTML: [/models/zipline-platform-2/history](/models/zipline-platform-2/history)._