EthereumJS on X: 🏗️ Thread 5 — builder lifecycle on the request bus. Thread 4: bigger bytecode + Nick's f…

🏗️ Thread 5 — builder lifecycle on the request bus.

Thread 4: bigger bytecode + Nick's factory.
Finale: Amsterdam adds builder deposit/exit requests for ePBS.

EIP-8282. 🧵

EthereumJS Verified account @EFJavaScript Aug 31

📦 Thread 4 — bigger contracts, same address everywhere.

Thread 3: native ETH finally logs.
Today: deploy larger bytecode + rely on Nick's CREATE2 factory.

EIP-7954 + EIP-7997. 🧵
View quoted post on X

Replies

EthereumJS @EFJavaScript Sep 7

Replying to @EFJavaScript

Status quo (EIP-7732 / Glamsterdam CL):

Builders stake and exit through validator-style flows.
Withdrawal credentials, voluntary exits, BLS hot keys.

Works — but it blurs two different actors on one bus.

EthereumJS @EFJavaScript Sep 7

Replying to @EFJavaScript

Amsterdam (EIP-8282):

Two new EIP-7685 request types on the EL:
• type 0x03 — BuilderDeposit
• type 0x04 — BuilderExit

Dedicated predeploys. Same end-of-block system-call pattern as EIP-7002.

eips.ethereum.org/EIPS/eip-8282

eips.ethereum.org EIP-8282: Builder Execution Requests Predeploy builder deposit and exit request contracts for EIP-7732 builders on the EIP-7685 request bus

EthereumJS @EFJavaScript Sep 7

Replying to @EFJavaScript

The contracts (Glamsterdam-devnet v7 mined):

Deposit: 0x0000bFF4…8282
Exit: 0x000064D6…8282

Builders register + top up via deposit calldata (184 bytes).
Exit is authorized by execution_address — not the BLS bid key.

EthereumJS @EFJavaScript Sep 7

Replying to @EFJavaScript

In @ethereumjs/vm:

runBlock() on Hardfork.Amsterdam already calls accumulateRequests().

Builder requests append after deposit / withdrawal / consolidation.

Read result.requests + result.requestsHash — same Prague+ pipeline, two new types.

EthereumJS @EFJavaScript Sep 7

Replying to @EFJavaScript

Gotcha #1 — validate vs build:

Validating: missing contracts → invalid block.
Building (generate: true): missing/failing call → empty request.

Local demos can seed STOP bytecode; devnets ship full contract code.

EthereumJS @EFJavaScript Sep 7

Replying to @EFJavaScript

Gotcha #2 — EthereumJS is execution-layer:

We accumulate EL requests + hash them.
ePBS / builder consensus rules live on the CL side.

Amsterdam preview — not production.

EthereumJS @EFJavaScript Sep 7

Replying to @EFJavaScript

Run it (Node 20+):

mkdir amsterdam-8282 && cd amsterdam-8282
npm init -y
npm i @ethereumjs/vm@10.1.3 @ethereumjs/block@10.1.3 @ethereumjs/common@10.1.3 @ethereumjs/tx@10.1.3 @ethereumjs/util@10.1.3 tsx

EthereumJS @EFJavaScript Sep 7

Replying to @EFJavaScript

Copy eip8282BuilderRequests.ts →

npx tsx eip8282BuilderRequests.ts

BuilderDeposit (type 3): 0 bytes
BuilderExit (type 4): 0 bytes
requestsHash: 0xe3b0…b855

github.com/ethereumjs/eth…

github.com ethereumjs-monorepo/packages/vm/examples/eip8282BuilderRequests.ts at master · ethereumjs/ethereu... Ethereum L1 Protocol Stack and EVM in TypeScript. Contribute to ethereumjs/ethereumjs-monorepo development by creating an account on GitHub.

EthereumJS @EFJavaScript Sep 7

Replying to @EFJavaScript

That wraps the Amsterdam deep-dive series 🎉

1 ⛽ two-dimensional gas
2 📋 BAL
3 📜 transfer logs
4 📦 code size + CREATE2 factory
5 🏗️ builder requests

Full bundle: Hardfork.Amsterdam in @ethereumjs/vm@10.1.3

github.com/ethereumjs/eth…