Relay operators. How about Nostr usernames as a way to fund free relays? Manually approved. Verified. Shouldn't be difficult to distribute the database to all relays. And it will double as a discovery service. nostr:npub1x0r5gflnk2mn6h3c70nvnywpy2j46gzqwg6k7uw6fxswyz0md9qqnhshtn