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 Nice! I've got a few questions if you don't mind

How do the estamps work? Are they going to be purchased from a service provider, and do you pay them back? Is there a server that gets paid or are users paying other users? 
 Nostr relay operators and Cashu mint operators are independent. If a relay accepts ecash issued by a mint, users can obtain ecash from the mint and use it as postage on their messages. Once the Nostr relay receives it, it can be exchanged for LN sats. 
 Ok it's the relay who gets paid, that's awesome. Is there an issue if the relay runs the mint? 
 If they wish, they can operate both a Nostr relay and a Cashu mint simultaneously.

We believe that relays will accept ecash issued by as many mints as possible.

nostr:note1xuv2l9e40vm2p05lk6prsn45tfmy4v4kgj6lxwewdxuysdr4wcrsrnva37 
 I think the reverse is better, meaning relays want to accept only from whitelisted mints.

Otherwise, I can spin up a new mint , print tokens and DoS attack Keychat since any new mint by definition can't be in the blacklist.