EthereumJS on X: Glamsterdam = Gloas (consensus) + Amsterdam (execution). Headliners: • ePBS — how blocks…

Amsterdam just got a public playground. 🐻‍❄️

Platåberget — Glamsterdam's first public testnet — is live.
EthereumJS v10.1.3 is a close-to-ready 14-EIP Amsterdam preview.

JavaScript is just the easy on-ramp. The fork is the story.

🧵

EthereumJS @EFJavaScript Aug 25

Replying to @EFJavaScript

Glamsterdam = Gloas (consensus) + Amsterdam (execution).

Headliners:
• ePBS — how blocks are built (CL)
• Block-Level Access Lists (EL)
• gas repricing toward a ~200M floor

Wallets, indexers, gas estimators: this one is for you.

blog.ethereum.org/2026/08/17/pla…

blog.ethereum.org Announcing the Platåberget Testnet | Ethereum Foundation Blog tl;dr: Meet Platåberget: Glamsterdam's (Gloas + Amsterdam) early testing ground open to public participation. This upgrade comes with breaking changes for...

Replies

EthereumJS @EFJavaScript Aug 25

Replying to @EFJavaScript

EthereumJS implements the Amsterdam (execution) half.

v10.1.3 — all 14 EIPs, aligned with glamsterdam-devnet-8.

npm i @ethereumjs/vm@10.1.3

Same APIs: createVM(), runTx(), runBlock(), buildBlock().

Osaka and earlier: unchanged until you opt in.

EthereumJS @EFJavaScript Aug 25

Replying to @EFJavaScript

Three moments that make Amsterdam click:

⛽ A transfer is no longer always 21,000 gas
📋 Every block commits a Block-Level Access List
📜 Native ETH transfers emit logs

EthereumJS @EFJavaScript Aug 25

Replying to @EFJavaScript

Next: 5 deep-dives. A spec you can run — JS is just the lab bench.

1. Two-dimensional gas
2. Block-Level Access Lists
3. ETH transfer logs
4. Bigger contracts + CREATE2 factory
5. Builder requests

Before → after. We hold your hand.

EthereumJS @EFJavaScript Aug 25

Replying to @EFJavaScript

Try it today (experimental — not for production):

npm i @ethereumjs/vm@10.1.3

Release:
github.com/ethereumjs/eth…

Amsterdam map + examples:
github.com/ethereumjs/eth…

Meta EIP:
eips.ethereum.org/EIPS/eip-7773

Thread 1 of the gas story lands next. 🚀 [ THE END ]

github.com Release @ethereumjs/vm v10.1.3 · ethereumjs/ethereumjs-monorepo Release round overview Welcome to 10.1.3 — a coordinated release across all active @ethereumjs/* libraries on the 10.1.x line. If you have been experimenting with the upcoming Amsterdam hardfork, t...