William Casarin (known online as jb55) is the CEO of Damus and one of the most prolific developers working at the intersection of Bitcoin and Nostr, the decentralized social protocol.
Damus
Casarin created Damus, one of the first and most popular Nostr clients for iOS. Damus helped bring the Nostr protocol to mainstream attention and demonstrated the potential for decentralized, censorship-resistant social media built on open protocols. The app integrates Bitcoin Lightning payments natively, allowing users to send tips (zaps) to each other.
Nostr Development
Beyond Damus, Casarin is a core contributor to the Nostr ecosystem, working on protocol improvements, libraries, and tools. He has been instrumental in shaping the protocol’s development and advocating for its adoption as a decentralized alternative to centralized social media platforms.
Background
Casarin is a software developer with a background in systems programming. He has contributed to various Bitcoin and Lightning projects and is known for his commitment to open-source development and censorship resistance.