Ed Felten
@EdFelten
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Co-founder @Offchain. Member @PCLOB_GOV. Professor of Comp Sci & Public Affairs Emeritus @Princeton. Prev: Deputy US CTO at White House. Personal account.
Princeton
Joined May 2008
How and why Arbitrum is the home of DeFi, more now than ever.
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The chain with the highest net inflows in 2025 tells a clear story: capital is consolidating around scalable, liquid, and production-ready infrastructure and @arbitrum is leading that shift. Arbitrum Everywhere
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When building Arbitrum, protecting users against front-running was always a top level design principle, right next to security. Over the years, I’d very often get asked why this was so important and the answer was always twofold 1. I view it as part of our basic duty to
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Debate on Ethereum’s L1 design is healthy and necessary. For a thoughtful, research-driven take on instruction set choices, I recommend: “Why RISC-V Is Not a Good Choice for an L1 Delivery ISA, and Why WASM Is a Better One” by @EdFelten 🔗
ethresear.ch
This Post in a Nutshell This document expresses the view of Offchain Labs. It was written by Mario Alvarez, Matteo Campanelli, Tsahi Zidenberg and Daniel Lumi. We offer this guidance in our commitm...
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1/10 New blog post: a control-theoretic view of Arbitrum’s constraint ladder gas pricer, why current rules overreact to harmless bursts and how a “constraint ladder” may fix it. One price, multiple time horizons, stable behavior.
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Crypto-means-cryptography literature gives huge importance to saving communication rounds, making protocols non-interactive. This typically comes at the cost of making protocols computationally expensive. FHE and (non-interactive) publicly verifiable secret sharing are good
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This post introduces some new concepts in L2 pricing, which we at @Offchain Labs are proposing for adoption to the @Arbitrum DAO. This cross-posted at the Arbitrum Research Forum, https://t.co/Io4mDvxMhB I’ll start by reviewing how L2 pricing works on Arbitrum today. This is
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Research post by @EdFelten on multi-constraint pricing, https://t.co/gerD80vWuW, which is a step towards full-fledged multi-dimensional pricing. The post explains current L2 execution pricing of Arbitrum chain, and proposes adding constraints for better resource allocation.
research.arbitrum.io
This post introduces some new concepts in L2 pricing, which are being proposed for adoption by the Arbitrum DAO. I’ll start by reviewing how L2 pricing works on Arbitrum today. This is fairly typical...
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Our paper on Economic Censorship Games in Fraud Proofs ( https://t.co/jjuawt7ih3) co-authored with @BenBerg07141321 and @EdFelten from @OffchainLabs and Benny Sudakov from @ETH_en was accepted at ACM EC 2025. Check out the list of accepted papers here:
arxiv.org
Optimistic rollups rely on fraud proofs -- interactive protocols executed on Ethereum to resolve conflicting claims about the rollup's state -- to scale Ethereum securely. To mitigate against...
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New and returning faces on The Cryptographers' Panel, a fan favorite #RSAC Keynote every year. Learn how the cryptographers see current events in cybersecurity and AI. https://t.co/KgCvjNuCRR April 29, 9:40 AM PT at RSAC 2025. @WhitfieldDiffie @EdFelten @ralucaadapopa @Vinod_MIT
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Come on over to Arbitrum, where it works like this: Your chain, your rules.
We're working with @Powerloom to make this migration happen smoothly. More details coming soon. If you're an OP Stack chain with a custom gas token and want to keep it, get in touch with us. We can help you migrate to @arbitrum quickly and handle all the heavy lifting.
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How embarrassing for Arbitrum. Other rollups are delivering 250 millisecond block time, and Arbitrum won't be able to ship that until 2021. Worse yet, there won't be Arbitrum chains with 100 msec blocks until 2023.
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Not Ethereum aligned: s**tposting about how others aren't aligned. Ethereum aligned: working every day to make the Ethereum stack faster, cheaper, more reliable, and easier to use, for users and developers. It's that simple.
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Those are some of the reasons why I think BoLD is one of the most important features to launch on Arbitrum One. Excited to continue developing cutting edge technologies with the ecosystem - and for the betterment of Ethereum.
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Trustless cooperation allows the community to pool funds together into a community stake to protect Arbitrum https://t.co/IuczPQbGsw
BoLD also enables trustless cooperation This allows multiple validators to pool resources to defend the same correct assertion without coordination. This radical breakthrough means honest parties can share defense costs without having to trust each other.
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There’s an upper bound to how long an attacker can delay, meaning resolution is guaranteed https://t.co/o9RCV3EDuk
And if attacked: BoLD's parallel challenge resolution means withdrawal delays are bound to a max of ~12.8 days (2 challenge periods), regardless of how many challenges an attacker creates. Traditional systems allow sequential delays that compound with each challenge.
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BoLD is a 0 -> 1 moment for Ethereum scaling Not just because it adds another green slice to Arbitrum’s pie But because it guarantees resolution and allows for trustless cooperation https://t.co/3tzYE8xBH5
Today, BoLD delivers permissionless validation, making the Arbitrum ecosystem more secure and more decentralized than ever. Anyone can defend Arbitrum. Stage 2 soon.
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What comes next is even better. The smoothest, fastest, trustless interop requires protocol innovation. In-protocol support for faster, fully trustless interop will power the multi-chain future. And Arbitrum will lead, as always.
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