Arbitrum is a Layer 2 scaling solution for the Ethereum blockchain which helps reduce high transaction gas fees. Arbitrum uses a multi-round optimistic rollup that regularly checks in with Ethereum’s main chain. OG cypherpunk and ex deputy CTO of the USA, Ed Felten, is one of the creators of Arbitrum. He joined us for an in depth chat about how transactions are processed on the protocol, who validates them, what the security guarantees are, and how the economics will work in the longer term.Topics covered in this episode:Ed's background (including his time as deputy CTO of the USA!) and what led him to creating ArbitrumA walk back to pre-blockchain cryptoWhy Arbitrum chose to build on top of EthereumWhat are roll-ups and what's the user experience with them on Arbitrum?A deep dive into how transactions work on ArbitrumHow nodes work on the platformTransaction fees on ArbitrumHow is Arbitrum designed differently to Optimism?Arbitrum and bridges to ETH and other assetsHow will different scaling solutions co-exist in the future?Episode links: ArbitrumArbitrum on TwitterEd on TwitterSponsors: Gnosis Safe: Gnosis Safe is a smart wallet for securely managing digital assets and allows you to define customized access permissions. - https://epicenter.rocks/gnosissafeTally Ho: Tally Ho is a new wallet for Web3 and DeFi that sees the wallet as a public good. Think of it like a community-owned alternative to MetaMask. - https://epicenter.rocks/tallycashSteakwallet: Steakwallet is your new favorite multi-chain, mobile wallet. Tired of having a different wallet for every chain? Get Steakwallet today and get the power of Web 3 across all chains right at your fingertips: https://steakwallet.fi/ -This episode is hosted by Brian Fabian Crain & Friederike Ernst. Show notes and listening options: epicenter.tv/448