https://github.com/mobilecoinfoundation/fog#overview https://github.com/mobilecoinfoundation/fog#overview This explains the issues fairly well. tl;dr most bloc

https://github.com/mobilecoinfoundation/fog#overview https://github.com/mobilecoinfoundation/fog#overview This explains the issues fairly well. tl;dr most blockchains require a CPU and/or network expensive sync which is prohibitive on mobile. As a fix/hack many web and mobile apps have a SPOF gateway which the client must trust absolutely.