NIP-05 is a form of identity here.
The @handlenames you see are not unique - so NIP-05 acts as an identifier that's tied to you.
They associate your public key(npub) with a domain/website, which is supposed to verify that it's indeed you who is using this Nostr account.
Devs/techies who have their own domain can use that but others use services like nostrplebs.com
uselessshit.co/resources/nostr has some guides on NIP-05
சாரு-秋陽
npub1qn…tl6rj
2023-04-25 16:07:44
in reply to nevent1q…kn88
Author Public Key
npub1qn49n06hdwwyrtvdyymu2wx57jvhz7anmu20tgsdjjyae3zhwaxsjtl6rjPublished at
2023-04-25 16:07:44Event JSON
{
"id": "4e79e99903aed5f304f09601af47202ba1437ae90953b717713946c851b0ab2c",
"pubkey": "04ea59bf576b9c41ad8d2137c538d4f499717bb3df14f5a20d9489dcc457774d",
"created_at": 1682438864,
"kind": 1,
"tags": [
[
"e",
"5859414ad613eac473dc2849955c50ff32de6c31d7a937eadb38fc3682428f9f"
],
[
"p",
"6e557e91716b06fb8b85447b0dfa5880e63d77f923441965708fdaf4342eeadc"
],
[
"r",
"nostrplebs.com"
],
[
"r",
"uselessshit.co/resources/nostr"
]
],
"content": "NIP-05 is a form of identity here. \n\nThe @handlenames you see are not unique - so NIP-05 acts as an identifier that's tied to you.\nThey associate your public key(npub) with a domain/website, which is supposed to verify that it's indeed you who is using this Nostr account.\nDevs/techies who have their own domain can use that but others use services like nostrplebs.com \n\nuselessshit.co/resources/nostr has some guides on NIP-05",
"sig": "706159b7bc2ac275ea2f81905cf587d5e39eaf39aa4ca4c14620aa29f769957f12f0e6086470e2293383bf7b8fa8184fc24e4ba834aca0fd2aa65bb00ae81189"
}