Grin, a strange new coin that runs on a technology called MimbleWimble, has captured the blockchain world’s imagination.

"In the Harry Potter books, the tongue-tying curse was a brilliant way to stump other wizards in a duel. Shut them up and they couldn’t cast another spell at you. The MimbleWimble curse, and its promise of silence, is part of the mysterious inspiration behind a new kind of blockchain technology that every fan of cryptocurrency is suddenly talking about. Besides its curiously compelling origins, it could hold a solution to something that many people see as one of the biggest limitations of Bitcoin and similar blockchains: the difficulty of keeping transactions truly private..."