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 Verifiable Databases with Shyam & Emanuele from ProvablyVerifiable Compute,Tools,ZK Applications08.04.2026 Dev Ojha on the Osmosis Story and his Return to PrivacyPrivacy,ZK Applications,Payments01.04.2026 lean Ethereum Part 6: Formal Verification with Alex HicksResearch,ZK Applications,ZK Tech25.03.2026 check our ZK JOB boards