What do people in the DeFi and cryptocurrency space need to know about trademarks? I’ve written about cryptocurrency and related topics before: see Trademarks and the Blockchain (2018) and NFTs and Copyright Law (2021). Even people who have been skeptical about cryptocurrency are beginning to identify use cases. For example, George Mason University economist Tyler Cowen recently wrote in Bloomberg: “After many years of doubt and uncertainty, a killer app has finally been found.” Cowen goes on: The core use case for crypto is called DeFi, a recently coined abbreviation for “decentralized finance.” DeFi doesn’t have a formal definition, but it…