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theaddonn / atomic-client-entities.md
Last active October 21, 2026 16:15
Reference for the Atomic Client Entity system in Minecraft Bedrock preview 1.26.70.21

Atomic Client Entities in Minecraft Bedrock 1.26.70

This document describes atomic client entities, a lightweight client-only entity type in Minecraft Bedrock preview 1.26.70.21. The findings come from reverse engineering that build and were checked in-game.

The system is marked "format_version": "beta" by Mojang. Its schema and behaviour may change in future releases.

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theaddonn / ddui-styling.md
Last active October 25, 2026 19:34
Reference for the Data-Driven UI styling system in Minecraft Bedrock preview 1.26.60.29

Data-Driven UI Styling in Minecraft Bedrock 1.26.60

This document describes the styling system for Data-Driven UI (DDUI) forms introduced in Minecraft Bedrock preview 1.26.60.29. The findings come from reverse engineering that build and were checked in-game.

The system is marked "format_version": "beta" by Mojang. Its schema and behaviour may change in future releases.

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theaddonn / mcb-format.md
Last active August 19, 2026 12:47
The MCB binary format: Minecraft Bedrock's compiled JSON (cameras, particles, trades, voxel shapes) stored inside .brarchive containers

The MCB binary format (Minecraft Bedrock compiled JSON)

MCB is a compiled, schema typed binary re-encoding of the definition files that Bedrock used to ship as plain JSON: cameras, particles, villager trades, voxel shapes, and more. Each MCB blob lives as a single entry inside a .brarchive container, and an archive can freely mix MCB entries with ordinary text JSON entries. You can tell them apart by the first four bytes: an entry is MCB when it starts with 7F 4D 43 42, which is \x7F followed by MCB, in the same spirit as the \x7FELF magic.