Cashu is a free and open-source Chaumian ecash system built for Bitcoin. Cashu offers near-perfect privacy for users of custodial Bitcoin applications. Nobody needs to knows who you are, how much funds you have, and with whom you transact with.

Nutstash makes interacting with cashu mints a breeze. It let's you easily create, store and send ecash, which is redeemable at the mint for sats on the lightning network, anonymously.