Grin is an upcoming cryptocurrency project focused on privacy, scalability, and fungibility that is built by implementing a MimbleWimble blockchain with some various optimizations. MimbleWimble is a fascinating stripped down blockchain protocol proposed by Tom Elvis Jedusor in July 2016 and has gained traction among many Bitcoin and privacy proponents.
Grin is an open-source project that offers a refreshing list of things that it will not do, many of which are contrary to the ongoing developments in the cryptocurrency market. To understand Grin and how it works, it is vital to first understand MimbleWimble and its advantages.