Grin empowers anyone to transact or save modern money without the fear of external control or oppression. Grin is designed for the decades to come, not just tomorrow. Grin wants to be usable by everyone, regardless of borders, culture, skills or access.
Grin is an in-progress implementation of the MimbleWimble protocol, which is a blockchain protocol that provides privacy and scalability gains by verifying that all tx are valid without needing to store the entire history of the chain.
White Paper / Documentation