optional draft author:22388oo
A Fedimint - or "Federated Mint" is an implementation of Chaumian eCash with a federation of guardians to custody funds, instead of a centralized actor, and is natively interoperable with Bitcoin's Lightning Network.
Cashu is a free and open-source Chaumian ecash system built for Bitcoin. Cashu offers near-perfect privacy for users of custodial Bitcoin applications.
TBD