There is a mint and there is a wallet. If you use an open source wallet you trust that follows the cashu protocol, you know the mint you're interacting with is following the rules of the protocol.
If you use a proprietary wallet with mint, you can't know what's behind.
Right nostr:npub12rv5lskctqxxs2c8rf2zlzc7xx3qpvzs3w4etgemauy9thegr43sf485vg ?