In the Harry Potter universe, there’s a handy spell for when you need to stop someone from spilling your secret plans or shit-talking during a duel. It’s called Mimblewimble, otherwise known as the tongue-tying curse. It’s also the name of a privacy technology designed for cryptocurrencies—because, well, somebody’s gotta keep crypto weird. The first coins to use Mimblewimble—distinct efforts called Grin and Beam—both launched in January.
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