It’s not about signatures. It’s about zappers having no way to know if the pubkey in a zap note actually belongs to the lightning address zapped.
Here’s the full URL. 02fbae2cc5 This is my stacker news ID. But the pubkey in the JSON string is of ODELL.
https://stacker.news/api/lnurlp/02fbae2cc5/pay?amount=500000&nostr={"id":"a719a1f21b49991ba832c02722e30cf271f9f8f7fa9fa3c0a459184de3ef497c","pubkey":"021d7ef7aafc034a8fefba4de07622d78fd369df1e5f9dd7d41dc2cffa74ae02","created_at":1676836080,"kind":9734,"tags":[["e","81b2dba2a3d2c92eedab1f966119bda65555d926b97bb41a14c07187472f6159"],["p","04c915daefee38317fa734444acee390a8269fe5810b2241e5e6dd343dfbecc9"],["relays","wss://relay.snort.social","wss://nostr.fmt.wiz.biz","wss://nostr.bitcoiner.social","wss://relay.damus.io","wss://nos.lol","wss://relay.nostr.bg","wss://relay.current.fyi","wss://nostr.oxtr.dev","wss://brb.io","wss://nostr.foundrydigital.com","wss://nostr.zebedee.cloud","wss://relay.nostr.info","wss://eden.nostr.land"]],"content":"","sig":"301ed4bda185bd59ce3ea0eadb2db4c12e4c4587f38793c8b00c4a0b6515be5d4615ba9301e6c60bc0440cb183b583d425d360437172ee198ff8cff0cfa94072"}
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