We've tried rate-limiting Cashu mints with PoW but turns out if you want mobile phones with javascript to compete against DoS servers, the server always wins...
I'm convinced now that the only practical use of PoW is Bitcoin and it's better to use sats to slow things down.
How about if the person trying to access the mint doesn't have Sats?
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Trying to add a new mint to an app with a built in NIP-60 (still an API call)
Trying to call the API to request a Lightning invoice to initially top up
