Ethereum’s upcoming Glamsterdam upgrade is making steady progress on two major tracks: Block Access Lists (BALs) and enshrined Proposer-Builder Separation (ePBS). Both efforts are now moving in parallel toward testing phases, setting the stage for one of the most ambitious upgrades since Dencun & Fusaka.

• BALs: Preparing for Devnet-0
• ePBS: Spec Updates & Breakouts
• Why Glamsterdam Testing Won’t Be Rushed?

BALs: Preparing for Devnet-0

The latest breakout session on Block Access Lists (BALs) confirmed that teams remain on schedule for the first BAL devnet in October. Developers were explicitly asked to use the bal-devnet-0 branches, signaling that client repositories are already integrating changes.

Topics discussed included handling a precompile for BAL functionality, with no major blockers reported. This green light indicates strong momentum as Ethereum edges closer to testing BALs in a live devnet setting.

ePBS: Spec Updates & Breakouts

On the enshrined Proposer-Builder Separation (ePBS) side, activity is equally strong. An ePBS breakout is scheduled, and the spec v1.6.0-beta.0 was released just before the latest call, giving contributors an updated reference point.

With Devnet-0 expected soon, developers were invited to provide feedback during the breakout. The dual-track advancement of BALs & ePBS underscores Ethereum’s determination to push forward Glamsterdam’s scalability, security, and decentralization goals.

Why Glamsterdam Testing Won’t Be Rushed

As highlighted by EtherWorld, core developers are emphasizing caution over speed. Unlike past upgrades, BALs & ePBS touch the core block-building process, making testing complexity far greater.

Developers have stressed that extensive devnet iterations & cross-client validation will be essential before locking in mainnet dates. This deliberate pace ensures network stability while giving researchers, client teams, and validators enough time to adapt to fundamental changes in Ethereum’s proposer-builder architecture.

The Glamsterdam roadmap is progressing on schedule, with BALs approaching their first devnet in October and ePBS moving forward with fresh spec updates. By blending ambitious consensus reforms with a packed execution-layer upgrade set, Glamsterdam is shaping up to be a pivotal moment in Ethereum’s evolution.

The message from core developers is clear: testing will not be rushed. Instead, a careful, multi-devnet path will ensure that when Glamsterdam finally hits mainnet, Ethereum will be stronger, cheaper, and more decentralized than ever before.

If you find any issues in this blog or notice any missing information, please feel free to reach out at yash@etherworld.co for clarifications or updates.

Related Articles

1. Ethereum Launches $2 Million Fusaka Audit Contest to Fortify Protocol Security
2. Ethereum Developers Announce "The Weld" Repository Merger
3. Ethereum Developers Target September 22 for Holesky Client Releases
4. Ethereum Developers Face Blockers in Shadowfork Testing Ahead of Fusaka
5. A New Playbook for Ethereum: Fusaka Rethinks Testnet & Mainnet Schedules