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A comment on Show HN: Login with HN (Unofficially). Parent comment

Re:Show HN: Login with HN (Unofficially) by tiffanyh on Thursday January 13, 2022 @01:49PM (#29924896)
Even before that, this is a common practice with DNS for decades to prove ownership of a domain.
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Re:Show HN: Login with HN (Unofficially) by curiousgal on Thursday January 13, 2022 @02:10PM (#29925225)
SPF

DKIM

Let's Encrypt Certificates

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