Builder's Block #024: Robinhood Chain Commits $1M in Funding to Open House & ArbOS Elara Now Live

📣 Announcements

Key updates from the Arbitrum ecosystem and Foundation.

Robinhood Chain Continues to Back Open House Singapore

One of the fastest growing chains is backing the next generation of founders. Robinhood Chain has committed $1M in funding to early-stage teams building through Arbitrum's Open House. Teams looking to bring a finance idea onchain can apply to our upcoming 3-week online Buildathon.

ArbOS Elara Upgrade Live on Arbitrum

Following approval through Arbitrum governance, the ArbOS Elara upgrade is now live on the Arbitrum Platform, bringing new capabilities to dedicated blockchains and important improvements to Arbitrum One.

ZK Settlement is Coming to Arbitrum

This paves the way for private Arbitrum chains and allows for faster Ethereum withdrawals (from days to hours). Thanks to Succinct Labs and Offchain, Arbitrum chains will be able to implement this new technology soon.

📚 Learn & Build

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

What Ethereum Developers Need To Know Before Deploying to Arbitrum

The Arbitrum Platform offers a familiar experience for Ethereum devs, but there are a few differences that can impact how contracts behave. From transaction ordering to dynamic pricing, @0xjesstech breaks down what they should know before deploying to Arbitrum One. 

What Would Change If Arbitrum Replaced Its State Tree

Offchain published an RFC on the Arbitrum forum a few weeks ago asking the community what would change for you if Arbitrum replaced that structure. The work is in the research phase now, but before you can even contribute you need to understand what's at stake.

Prototype to Production Fireside with OpenZeppelin

Founders should be asking "How will this break?" long before they push to production. Real production readiness is having an executable playbook before a crisis hits.

Hear from OpenZeppelin sharing battle-tested advice - exclusively from Open House.

AI Writes More Code Now. So What Becomes the Developer's Job?

An empty wallet isn’t a successful onboarding flow.

AI can dramatically reduce the time spent writing code, but that makes planning, review and testing more important, not less. OpenZeppelin how Claude, Codex & other agentic coding tools can be used during feature development without blindly trusting the output.

🔦 Ecosystem Highlights

Fresh launches and standout threads from around the Arbitrum ecosystem.

Loaf Markets: Pioneers of the Programmable Economy in Tokenization

Loaf Markets is bringing billions of dollars of physical assets to the programmable economy: AI & data - Terafab, Landmarks - Eiffel Tower, Public assets - Golden Gate Bridge, and eventually the entire physical world.

Using Arbitrum’s deep liquidity, @Loafmarkets are turning physical assets into onchain markets anyone can trade 24/7.

T3tris Hits $12M in TVL

T3tris Finance, among the 10 teams that came out of stealth from our first Arbitrum Mentorship Program, hits $12M in TVL across Arbitrum One and Robinhood Chain since launching in July.

🛠️ Dev Tooling & Infra

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

What Does Multidimensional Gas Pricing Change for Developers?

It changes how resources are accounted for, letting devs optimize their applications across 6 resource dimensions - Compute, Storage Read + Write, Storage Growth, History Growth, & Calldata. Watch Ali from Entropy Advisors break it down.

Nitro v3.11.3 is Now Fully Released

This update improves validator stability, more accurate transaction filtering, and clearer debugging tools through better RPC error messages, tracing, and logging for filtered transactions. The source code is published on GitHub and the standard Docker images are live on Docker Hub.

🗓️ Events

Workshops, hackathons, and ecosystem meetups to watch.

Open House Singapore Online Buildathon Starts Sept 14

Open House Singapore will kick off with a 3-week, online Buildathon on September 14, designed to help founders refine their direction and iterate towards an MVP. Teams that are looking to bring novel financial products to the Arbitrum Platform are welcome to apply today.

🧵 Forum & Community Discussions

What builders are debating and proposing this week.

Arbitrum Security Program

The Arbitrum Foundation proposes to continue and evolve the Arbitrum Audit Program (AAP) - launched on 1 August 2025 with a one-year mandate into a broader Arbitrum Security Program (ASP), running for a further 12 months on a rolling-application basis.

[CONSTITUTIONAL] AIP: Authorize Priority Gas Auctions and Establish the Fast Feed

This AIP proposes to combine two separate actions into a single on-chain vote for the ArbitrumDAO to consider: transitioning Arbitrum One's ordering policy from Timeboost to Priority Gas Auctions and sunsetting Timeboost on Arbitrum Nova; and establishing the Fast Feed, a paid and authenticated data streaming product for Arbitrum One.

That’s all from Builder’s Block #024. Thank you for reading, and keep building. Arbitrum Everywhere.