With the nature of Nostr protocol, it is close to impossible to guard signups (there is none, just random bytes are your keys) Clients on the other hand can provide some level of filtering together with relays 🫡🫂(welcome)
It is my thinking that a third party age verification service would offer an API or another interface between itself and nostr clients to provide the verification. After all, Alby currently provides account authentication. I'm assuming that a nostr account verification could include age verification to affect the client's settings on what the account is permitted to access.
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