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 Alex Ozdemir on where Theorem Provers and ZK meetResearch,Tools,Formal Verification15.07.2026 Sergey Gorbunov on TEEs and the Arc Privacy SectorL1's,Hardware,Privacy08.07.2026 zkMesh+ Exclusive Clip – Benedikt Bünz on the threat of AIBonus01.07.2026 check our ZK JOB boards