> ## Content Index > Fetch the complete content index at: https://blog.arbitrum.foundation/llms.txt > Use this file to discover other available public pages before exploring further. # Builder's Block #004 - Get your security audit subsidized, Bobcat SDK & Arbiverse - URL: https://blog.arbitrum.foundation/builders-block-004-get-your-security-audit-subsidized-bobcat-sdk-arbiverse/ - Published: 2025-10-23T16:00:14.000Z - Updated: 2025-10-23T16:00:13.000Z - Author: Arbitrum Foundation - Tags: Builder Newsletter 💡 ****What to Try This Week** 🦀 Spin up a Rust-based Stylus contract using the live demo 🔒 Apply for the Arbitrum Audit program to get your audit subsidized 🎓 Enroll in the Stylus Bootcamp for in-depth training ## 📣 Announcements *Key updates from the Arbitrum ecosystem and Foundation.* **• $10m Arbitrum Audit Program still LIVE** [![G21ESOGaAAAosLv.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/G21ESOGaAAAosLv.jpg)](https://tally.so/r/3xzEzv?program=aap&ref=blog.arbitrum.foundation&utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=) A new audit fund — $10 million in ARB — is available for top-tier smart-contract audits over the next year. Applications rolling. ➡️ [Apply now](https://tally.so/r/3xzEzv?program=aap&ref=blog.arbitrum.foundation&utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=) **• 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](https://arbitrum.notion.site/EXT-Comms-Breaking-Change-Notice-L1-Beacon-Chain-Node-in-Fusaka-Subscribe-To-All-Subnets-28401a3f59f880d68e83ce2779b79ce3?ref=blog.arbitrum.foundation) ## 📚 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. [![0925_Arbitrum_StylusSolidityContract_Blog_R1_option2-1.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/0925_Arbitrum_StylusSolidityContract_Blog_R1_option2-1-1.jpg)](https://blog.arbitrum.foundation/how-to-make-a-solidity-contract-100x-cheaper-and-faster/) ➡️ [Read the article](https://blog.arbitrum.foundation/how-to-make-a-solidity-contract-100x-cheaper-and-faster/) **• A quick read on the tools and integrations helping you build faster on Arbitrum with Stylus and Thirdweb** [![1025_Thirdweb_CaseStudy_Blog_R3.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/1025_Thirdweb_CaseStudy_Blog_R3.jpg)](https://blog.arbitrum.io/how-thirdweb-uses-arbitrum-stylus-to-power-the-next-wave-of-onchain-apps/?ref=blog.arbitrum.foundation) Learn how Thirdweb Uses Arbitrum Stylus to Power the Next Wave of Onchain Apps. ➡️ [Read the article](https://blog.arbitrum.io/how-thirdweb-uses-arbitrum-stylus-to-power-the-next-wave-of-onchain-apps/?ref=blog.arbitrum.foundation) **• Build the Next Generation of Dapps on Arbitrum with Arbitrum Stylus via Lava RPC** [![G1ssJY2XoAAyiRI.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/G1ssJY2XoAAyiRI.png)](https://www.youtube.com/watch?v=9pvCE-LfDP4&ref=blog.arbitrum.foundation) 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](https://www.youtube.com/watch?v=9pvCE-LfDP4&ref=blog.arbitrum.foundation) --- ## 🔦 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* **• Ethereal's Mainnet Alpha is now live** [![ethereal_mainnet_live_frame.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/ethereal_mainnet_live_frame.png)](https://x.com/etherealdex/status/1980687756633448814?ref=blog.arbitrum.foundation) 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](https://x.com/etherealdex/status/1980687756633448814?ref=blog.arbitrum.foundation) --- ## 🛠️ 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](https://stylus-saturdays.com/p/introducing-bobcat-sdk-a-tiny-3x?ref=blog.arbitrum.foundation) **• 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](https://x.com/ArbitrumDevs/status/1978275306755539231?utm%5Fsource=chatgpt.com) **• New Scaffold-Stylus version released** [![G37ZZQ9XIAAzwbo.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/G37ZZQ9XIAAzwbo.jpg)](https://www.scaffoldstylus.com/?ref=blog.arbitrum.foundation) 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](https://www.scaffoldstylus.com/?ref=blog.arbitrum.foundation) **• With ArbOS 40, Arbitrum supports EIP-7702, bringing native Account Abstraction onchain - solving longstanding challenges that have hindered builders** [![1025_Arbitrum_AccountAbstraction_Blog_option2.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/1025_Arbitrum_AccountAbstraction_Blog_option2-1.jpg)](https://blog.arbitrum.foundation/the-smartest-wallet-you-already-own-is-on-arbitrum/) ➡️ [Read the article](https://blog.arbitrum.foundation/the-smartest-wallet-you-already-own-is-on-arbitrum/) --- ## 🗓️ Events *Workshops, hackathons, and ecosystem meetups to watch.* **• Nov 19: ArbiVerse is coming to Devconnect in Buenos Aires** [![G34KV8laAAAo5KJ.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/G34KV8laAAAo5KJ-1.png)](https://luma.com/ArbiVerseBuenosAires?ref=blog.arbitrum.foundation) 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](https://luma.com/ArbiVerseBuenosAires?ref=blog.arbitrum.foundation) **• Oct 24-26: Arbitrum is proud to be sponsoring Encode Club’s London Hackathon** [![G3xckSLa4AACwUM.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/G3xckSLa4AACwUM.jpg)](https://www.encodeclub.com/programmes/encode-london-2025?ref=blog.arbitrum.foundation) $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](https://www.encodeclub.com/programmes/encode-london-2025?ref=blog.arbitrum.foundation) **• Oct 27: Stylus Bootcamp (4-Week Training) — RareSkills × Offchain Labs** [![G26NABSacAAcbQR.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/G26NABSacAAcbQR.jpg)](https://rareskills.io/stylus-bootcamp?ref=blog.arbitrum.foundation) Intensive hands-on Rust-on-Stylus program for experienced Solidity / Rust devs. Next cohort starts October 27th. ➡️ [Sign up now](https://rareskills.io/stylus-bootcamp?ref=blog.arbitrum.foundation) --- ## 🧵 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](https://snapshot.box/?ref=blog.arbitrum.foundation#/s:arbitrumfoundation.eth/proposal/0xc5f06144fa92aaff99e0e44482ab6f7a3f6486dfb6c854d16271399ffcf895e6) **• 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](https://snapshot.box/?ref=blog.arbitrum.foundation#/s:arbitrumfoundation.eth/proposal/0xc5f06144fa92aaff99e0e44482ab6f7a3f6486dfb6c854d16271399ffcf895e6) **• The DAO Incentive Program (DIP 2.0) put forth by AF is collecting community feedback** ➡️ [Read up on the proposal](https://forum.arbitrum.foundation/t/the-dao-incentive-program-dip-2-0/30080?ref=blog.arbitrum.foundation) **• 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](https://www.tally.xyz/gov/arbitrum/proposal/57495998481040869152703890521939307107269690440073097268210566577740258992963?govId=eip155:42161:0x789fC99093B09aD01C34DC7251D0C89ce743e5a4&ref=blog.arbitrum.foundation) --- That’s all from Builder’s Block #004\. Thank you for reading, and keep building. Arbitrum Everywhere.