Sounds amazing! Can I read more about this somewhere?
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If you want to get knee-deep into the crypto:
WabiSabi paper on KVAC used for CoinJoins: https://eprint.iacr.org/2021/206.pdf
The Signal Private Group System and Anonymous Credentials Supporting Efficient Verifiable Encryption: 
We'll publish more resources on as we build out the protocol for Cashu.
IACR Cryptology ePrint Archive
The Signal Private Group System and Anonymous Credentials Supporting Efficient Verifiable Encryption
In this paper we present a system for maintaining a membership list of users in a group, designed for use in the Signal Messenger secure messaging ...