Episode 179: Diving into Arbitrum’s Optimistic Rollup

This week, Anna and James host Ed Felten and Steven Goldfeder, co-founders of Arbitrum, an Optimistic Rollup project born before the term “Optimistic Rollup” was even coined.

Ed and Steven tell Arbitrum’s story, from its beginnings as a chain-agnostic university project in 2014 to become an Ethereum-based Optimistic L2 Rollup solution based on fraud proofs. They cover Arbitrum’s interactive fraud proofs, how they differ from other solutions like Optimism, and how Arbitrum and the Optimistic Rollup helps Ethereum scale.

Here are some links for this episode:


If you're looking to work in blockchain and the zk space, check out the ZK Jobs board! You'll find great opportunities to work at the forefront of blockchain tech, divided into business, engineering and cryptography positions.

Also, we are hosting the second ZK Jobs Fair on May 19, right after our zkSessions on zk languages. Register for free here on Hopin: https://hopin.com/events/zksessions-the-zk-languages-showdown


Thanks to this episode’s sponsor, Aave

Aave is an open source, decentralised non-custodial liquidity protocol on Ethereum.

With Aave, users can participate as depositors meaning they provide liquidity to earn a passive income. or they can also act as borrowers to borrow in an overcollateralized way or undercollateralized way (think: one-block liquidity Flash Loan).

Aave recently deployed a new market on Polygon’s sidechain to let users pay much lower gas fees. Assets can be transferred from Ethereum with the Polygon Bridge and put to use on Aave’s Polygon markets.

Learn more about it here.

So thanks again, Aave!


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Previous Episodes

Episode 197: WalletConnect & the DApp/Wallet connection with Pedro Gomes

This week, Anna chats with Pedro Gomes, Founder of WalletConnect, about how wallets and DApps traditionally interact and the journey to WalletConnect and WalletConnect 2.0. Pedro shares the ideas behind the new WalletConnect 2.0 development and his thoughts on what role the project will play in a Multi-Chain future.

Episode 196: Mixnets, Activism and Privacy with Nym’s Harry Halpin

This week, Anna chats with Harry Halpin, CEO of the Nym project, about a variety of topics related to privacy, politics and the need to build censorship-resistant systems. Harry talks about his early involvement in cryptography and his changing perspectives on capitalism as a tool for good. He shares how Nym aims to protect blockchain transactions from network-based deanonymization attacks.

Zero Knowledge Podcast (finally) has a real website!

No full episode this week, but we just wanted to let you know about the new zeroknowledge.fm website. Finally, we have a site that brings together all the different parts of the ZK Community: podcast episodes, upcoming and past events, blog, social channels and more.

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