How will they find out about the volume?
Mints have to have deposits to issue ecash. So, just track the deposits on chain.
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Cashu mints use Lightning
So there's no final settlement with a mint? A mint is a layer 3 credit? TBF I haven't researched but I always heard Mints were a layer 2 tech.
Reference:
Layer1- Bitcoin On-chain
Layer2- a coupon redeemable for Bitcoin
Layer3- a credit to redeem a coupon.