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 zkMesh+ Exclusive Clip – Benedikt Bünz on the threat of AIBonus01.07.2026 Pushing the Limits of Proof Systems with Benedikt BünzResearch,L2's,Verifiable Compute24.06.2026 Announcement: zkMesh+ Exclusive Clip – Vericoding and SMT18.06.2026 check our ZK JOB boards