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 lean Ethereum Part 3: Security of PQ SNARKs and an update about t...ZK Applications,ZK Tech,Research04.03.2026 lean Ethereum Part 2: PQ Signatures and Poseidon with Dmitry and ...ZK Applications,ZK Tech,Research25.02.2026 lean Ethereum Part 1: Introduction with Justin DrakeZK Applications,ZK Tech,Research18.02.2026 check our ZK JOB boards