SHAREIn this episode, we sit down with Ethan (Bucky) Buchman, co-founder & CTO of Tendermint, to talk about testnets. We look into what they are, what purpose they serve and cover examples from Bitcoin, Ethereum, Cosmos and Polkadot. Links Testnets on Karl.tech The latest gossip on BFT consensus Bitcoin Testnet Ropsten Testnet Kovan Testnet Rinkeby Testnet Join the Cosmos testnet Join the Polkadot testnet RECENT EPISODES Alex Ozdemir on where Theorem Provers and ZK meet15.07.2026 Sergey Gorbunov on TEEs and the Arc Privacy Sector08.07.2026 Pushing the Limits of Proof Systems with Benedikt Bünz24.06.2026 check our ZK JOB boards