World (world.org) is building the largest identity and financial network. In order to build privacy-preserving ZK identity systems, it is required for the proofs to be created on the users' devices so as to preserve user data privacy. However, mobile phones and other edge devices do not have the necessary computational capabilities to support the most important identity use cases at World scale. World has been building lots of innovative solutions in the client-side proving space and beyond in order to enable privacy-preserving ZK identity to its existing user base of over 20M humans.