Announcing the Platåberget Testnet

tl;dr: Meet Platåberget: Glamsterdam's (Gloas + Amsterdam) early testing ground open to public participation. This upgrade comes with breaking changes for application developers. Notably, any tool that relies on a hardcapped maximum gas limit (think wallets, indexers and gas estimators) will break and needs to be updated. Please use this early opportunity to test!

Platåberget is a short-term testnet aimed for testing changes by the community. Unlike the short-lived devnets before it, Platåberget is intended to run for a few months, giving the community a stable place to experiment with post-Glamsterdam Ethereum, and an opportunity to test and break things before Glamsterdam goes live on Ethereum's longer-lived testnets, Sepolia and Hoodi.

What's in the Glamsterdam fork

The Glamsterdam upgrade brings significant changes to both the consensus and execution layers. Highlights include:

• Enshrined Proposer-Builder Separation: a major change to how blocks are built, proposed and validated, including a new builder API flow and PTC (payload-timeliness) checks. Infrastructure which depends on the block production and validation pipeline should expect to be affected.
• Block-Level Access Lists: introduces enforced block-level access lists that record accessed state locations and post-transaction changes. BALs are stored separately from the block body and can be exchanged between execution-layer peers through eth/71.
• Gas repricings: a coordinated bundle of gas cost changes aimed at a ~200M gas floor. Any tooling that hardcodes a maximum gas limit will be affected.
• Larger contracts and initcode: increases the maximum deployed contract size from 24KiB to 64KiB and the maximum initcode size from 48KiB to 128KiB.
• Forward-compatible consensus data structures