Builder's Block #004 - Get your security audit subsidized, Bobcat SDK & Arbiverse

📣 Announcements

Key updates from the Arbitrum ecosystem and Foundation.

• $10m Arbitrum Audit Program still LIVE

A new audit fund — $10 million in ARB — is available for top-tier smart-contract audits over the next year. Applications rolling.
➡️ Apply now

• Node Operators: Sepolia Hard-Fork Guidance
As part of the Fulu consensus node upgrade in Fusaka, Ethereum’s PeerDAS (EIP-7594) will be activated.

Node operators for Layer 2 networks, such as Arbitrum One and other Arbitrum L2 chains, will need to make sure they connect to a L1 Ethereum Beacon Chain Node that is subscribed to all subnets in order for the Nitro node software to function properly.
➡️ Check the details

📚 Learn & Build

New learning drops and hands-on resources from across the Arbitrum ecosystem.

• How to Make a Solidity Contract 100x Cheaper and Faster
Learn how to offload compute-heavy logic to WASM/Rust while keeping full EVM composability.

➡️ Read the article

• A quick read on the tools and integrations helping you build faster on Arbitrum with Stylus and Thirdweb

Learn how Thirdweb Uses Arbitrum Stylus to Power the Next Wave of Onchain Apps.
➡️ Read the article

• Build the Next Generation of Dapps on Arbitrum with Arbitrum Stylus via Lava RPC

In the video you’ll learn how Arbitrum Stylus lets you write contracts in Rust and other languages, how to deploy an ERC20 token and interact with it via a dapp, and how Lava RPC powers contract deployment, minting, transfers, and receipts.
➡️ Watch the video

🔦 Ecosystem Highlights

Fresh launches and standout threads from around the Arbitrum ecosystem.

• Ethereal's Mainnet Alpha is now live

As a USDe-native perps dex, they’ll be building out a financial ecosystem with an ultra fast perps experience with 100ms block times and direct access to deep liquidity as an L3 on Arbitrum One.
➡️ Check out Ethereal

🛠️ Dev Tooling & Infra

Updates to SDKs, CLIs, and developer workflows across the stack.

• Introducing Bobcat SDK, a TINY (3x smaller than Stylus SDK) community owned SDK for Rust Arbitrum Stylus
This SDK accomplishes gas savings by reducing the amount of abstractions in the SDK, using host features for checked math, not using the allocator by default, and many other changes.
➡️ Check out the SDK

• The Nitro 3.7.6 release contains a fix to support the new blobs endpoint from Ethereum Consensus Layer (CL) clients.
For teams who upgraded their batch posters to 3.8.0-rc8 or accidentally upgraded their RPC nodes to 3.8.0-rc8, we recommend 3.8.0-rc9.

We still strongly recommend teams who are on 3.7.x to stay on 3.7.x because 3.8.0-rc9 is not fully tested and introduces a database schema migration.
➡️ Read the full thread

• New Scaffold-Stylus version released

The latest version is live with major updates across ScaffoldStylus hooks, OpenZeppelin-Stylus, and docs. Installation is now simpler with stylusup, plus refreshed ERC721 and VRF extensions.
➡️ Check out Scaffold-Stylus

• With ArbOS 40, Arbitrum supports EIP-7702, bringing native Account Abstraction onchain - solving longstanding challenges that have hindered builders

➡️ Read the article

🗓️ Events

Workshops, hackathons, and ecosystem meetups to watch.

• Nov 19: ArbiVerse is coming to Devconnect in Buenos Aires

Join us on Nov 19 for Arbitrum’s massive flagship event with interactive builder showcases, talks, fun mini games, live music and food. And there's more!
➡️ Sign up now

• Oct 24-26: Arbitrum is proud to be sponsoring Encode Club’s London Hackathon

$4,000 in prizes up for grabs! Our challenge: Build AI-to-AI payments on Arbitrum.

Use open standards like AP2 and x402 to create agents that:
• Request and authorize payments
• Complete transactions autonomously
• Settle seamlessly on Arbitrum
➡️ Apply now

• Oct 27: Stylus Bootcamp (4-Week Training) — RareSkills × Offchain Labs

Intensive hands-on Rust-on-Stylus program for experienced Solidity / Rust devs. Next cohort starts October 27th.
➡️ Sign up now

🧵 Forum & Community Discussions

What builders are debating and proposing this week.

• DVP Quorum Snapshot ends with majority support
This proposal aimed to collect community sentiment on the delegated voting power (DVP) based quorum model. Voting ended with 157.4M ARB voting FOR and only 16.8M ARB voting AGAINST.
➡️ Read up on the proposal

• Arbitrum Gaming Ventures (AGV) Council reissues Snapshot
The AGV Council seeks DAO approval for an updated compensation framework for future councils.
➡️ Read up on the proposal

• The DAO Incentive Program (DIP 2.0) put forth by AF is collecting community feedback
➡️ Read up on the proposal

• Onchain Proposal: Transfer 8,500 ETH from the Treasury to ATMC’s ETH Treasury Strategies
Entropy’s proposal to transfer 8500 ETH to the Arbitrum Treasury Management Committee (ATMC)’s ETH strategies is undergoing onchain voting. The voting commenced Oct 17 and will end in ~2 weeks.
➡️ Check out the proposal

That’s all from Builder’s Block #004. Thank you for reading, and keep building. Arbitrum Everywhere.