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 Lighter, Perp DEXs and Custom ZK CircuitsDeFi,Blockchain,L2's27.08.2025 Ethproofs, zkVM Benchmarks & the Unstoppable Rise of ZK with...Blockchain,Verifiable Compute,Ecosystem20.08.2025 zkPDF and zkID with Vikas Rushi and Ying TongPrivacy,ID,Tools,Wallets13.08.2025 check our ZK JOB boards