Very non technical person here, but could NIP-05 help fight spamming ? As it seems to cost a bit of money to grab a identifier, could relays ask for "verified" users only thus avoiding beiing spammed ?
NIP-05 is just an identifier, for now. Relays can implement their own requirements for posting such as having a NIP-05 identifier.
For verification: Badges would be more useful for this. If you properly verified someone, you could give them a badge, and anyone's client that trusts you says "oh, okay, this person is verified by this person I trust, show a checkmark". Badges could also be useful for things like orange checks.
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