Grin is a lightweight cryptocurrency that implements the Mimblewimble protocol, offering a unique balance of privacy and scalability. Unlike other chains, Grin does not have addresses or store data of spent outputs. It is an open-source and community-driven project, with funding coming from donations and voluntary contributions. Grin has a blocktime of 1 minute and a coinbase reward of 60 grins per block, resulting in a constant increase in supply and a decreasing rate of inflation. The development of Grin started with an anonymous person sharing a document titled "Mimblewimble" in 2016, which gained interest from developers like Andrew Poelstra. In October 2016, a developer named Ignotus Peverell began working on implementing the protocol, leading to the launch of Grin on January 15th, 2019.