Cashu is great. The only thing I don’t like is that Carol needs to trust Alice’s mint. I understand that this is the constraint to make the tokens pure data, but it feels awkward that Carol needs ...
Cashu is a trust-based custodial system. All users need to trust the mint. The benefit is privacy, ease of use, and censorship resistance. The mint can only rug everyone or no one (you can’t be singled out and rugged or censored as an individual user).
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