Lightning login is an anti-pattern. Identity and finances should be kept separate.
I don't consider my lightning wallet with 30k sats in it to represent my finances. If someone stole my coin purse, they wouldn't know my bank account balance.
But it's an interesting perspective still. Maybe a better solution would be 'nostr login', i.e. the service sends you a message and you sign it with your nsec? Ideally not one you use with nostr clients, which you share it with.
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BASED

that's a hectic insight thank you for bestowing that gem of an idea

I think people seek to just combine shit together just for the sake of it without realizing what they're actually doing. This lightning auth is one component of that.
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That's an interesting perspective.
I've always wondered why I like Lightning on my phone and scanning QR codes on the PC screen so much. It just feels weirdly good. This might be the reason
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Fair but I don't need to keep any sats in a lightning wallet to use for login.
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