# Ethereum Tests a Partitioned Binary Tree on Glamsterdam’s Mainnet Shadow Fork By Simon Yoon Canonical URL: https://www.tokenpost.com/news/technology/43510 Published: 2026-10-29T12:31:30.000Z Updated: 2026-10-29T12:31:30.000Z Section: Technology > The proposed migration would replace the Merkle Patricia Trie. A Besu maintainer tested the transition on the fork. Ethereum is testing a proposed move to a Partitioned Binary Tree (PBT) on the glamsterdam-pbt-1 mainnet shadow fork, a step aimed at making state proofs smaller and state management more efficient. Consensys announced the test on the fork. The proposed migration would replace the Merkle Patricia Trie. A Besu maintainer tested the transition, which also aims to help nodes operate without missing slots. The test follows Glamsterdam’s [Oct. 6 fork on Sepolia](). Ethereum’s mainnet deployment remains targeted for the fourth quarter of 2026, with no specific activation date set. ## Links in this article - [Oct. 6 fork on Sepolia](https://www.tokenpost.com/news/technology/27517)