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 ← Previous Episode → Next Episode RECENT EPISODES From Nova to Magnetar: Three Years of Research with Srinath SettyResearch28.10.2026 zkGolf: AI, Clean and Optimising ZK Circuits with zkSecurityZK Tech,Research,AI21.10.2026 Exploring the Lasers that Power Quantum ComputersHardware,Research,Quantum07.10.2026 check our ZK JOB boards