In this talk, we dive into the world of collaborative SNARKs, what they are, the unique challenges they tackle, and what they are used for. We explore how to create private shared state, enabling private on-chain data to stay confidential while still supporting computations that draw from multiple data owners, all without compromising privacy. Finally, we introduce co-Noir, our collaborative SNARK extension for Noir and show how to build confidential token transfers from it.