John Adler, co-founder of Fuel Labs and long time Ethereum Layer 2 scalability researcher joins the podcast. John walks us through the history of Layer 2 scaling solutions attempted on Ethereum and brings us to the reason he co-founded Fuel Labs. They are looking to help scale Ethereum using optimistic rollups with an emphasis on the payments use case. John has an extremely deep understanding of Ethereum and layer 2 scaling. He also shares his thoughts on ProgPoW and flash loans.