I don't think it's difficult tbh. You would have to maintain a set of valid pubkeys (those that have valid nip05), and check that when an event reaches the relay.
These sort of things are super easy to do using rely
https://github.com/pippellia-btc/rely
pippellia / Pip the social graph guy
npub176…7vgup
2025-05-25 09:20:18
in reply to nevent1q…3hry
Author Public Key
npub176p7sup477k5738qhxx0hk2n0cty2k5je5uvalzvkvwmw4tltmeqw7vgupPublished at
2025-05-25 09:20:18Event JSON
{
"id": "1263563757a7a83f0bc00bddc8365a31def8c0430f49b41d4bee36387fc6256c",
"pubkey": "f683e87035f7ad4f44e0b98cfbd9537e16455a92cd38cefc4cb31db7557f5ef2",
"created_at": 1748164818,
"kind": 1,
"tags": [
[
"p",
"fd208ee8c8f283780a9552896e4823cc9dc6bfd442063889577106940fd927c1",
"https://theforest.nostr1.com/"
],
[
"e",
"cb28bcda3d5fbd125b531bd5cde2c69d64ab64d9101d014f19aa0400f66522eb",
"https://theforest.nostr1.com/",
"root",
"fd208ee8c8f283780a9552896e4823cc9dc6bfd442063889577106940fd927c1"
]
],
"content": "I don't think it's difficult tbh. You would have to maintain a set of valid pubkeys (those that have valid nip05), and check that when an event reaches the relay.\n\nThese sort of things are super easy to do using rely\n\nhttps://github.com/pippellia-btc/rely",
"sig": "5224cc29383a114f37b3e6c6dd2a39a755f626615c450fc6de9030177d0a75a7acbe50a2f8e4931a8722b2f4983f0f203d37c7a78fd89869f2963f6dda43dc11"
}