Will cryptocurrencies save the world or create a new can of worms? Antoinette Schoar joins Vasant Dhar in episode 42 of Brave New World to take us on a dispassionate tour through the world of Bitcoin, blockchains and DeFi. Useful resources: 1. Antoinette Schoar At MIT Sloan School of Management and Google Scholar. 2. Cryptocurrencies and decentralized finance (DeFi) -- Igor Makarov and Antoinette Schoar 3. David Yermack on The Crypto Revolution -- Episode 30 of Brave New World. 4. Bitcoin: A Peer-to-Peer Electronic Cash System -- Satoshi Nakamoto. 5. Are Cryptocurrencies Currencies? Bitcoin as Legal Tender in El Salvador -- Fernando Alvarez, David Argente and Diana Van Patten. 6. Incomplete Contracts and Control -- Oliver Hart's Nobel Prize Lecture.