So how about you also setup https://cashapp.com/.well-known/nostr.json?name=cashtag to automatically give CashApp NIP05 Nostr Usernames to everyone that already has a CashTag..? These will obviously be doxxed KYC'd Nostr accounts (at least within your database) but it seems like providing Merchants a means of communicating with their Consumers (perhaps thru NIP17 protocols as Bitchat does) could be a powerful add-on feature for your existing userbase! This would then enable us all to find and send Zaps to anyone/everyone that has a CashTag.