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 Access Control to Encrypted Execution with Auryn MacmillanMPC,FHE,ZK Applications20.05.2026 Quantum Advances, Hybrid Signatures and SNARKs to the Rescue with...ZK Tech,Research,ZK in BTC06.05.2026 Is ZK dead? Or has it just begun? with the ZK Pod co-hostsRecaps,Industry News,Ecosystem22.04.2026 check our ZK JOB boards