There is still much that is unknown about the largest decentralized finance (DeFi) security breach to date, the sophisticated attack that drained $600 million worth of cryptocurrencies from the China-based Poly Network, including the identity of the “hacker” (or hackers) and their underlying motivations. It was a story that riveted the industry, in part because the “Polynetwork hacker” ultimately returned all the stolen funds while communicating with the public the whole way through.