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Re:Show HN: ClapChat – Instant messaging for HN users by todd3834 on Saturday December 24, 2016 @01:12PM (#13250902)
Glad you asked! So here is a teaser on how it works: 1. ClapChat gives you a unique id, the extension posts the id in your profile, ClapChat independently verifies that your profile contains the correct ID so that we know you really do own the account, then we double check the ID vs the session that we gave the id to and we can validate the authorization.

I'm working on a blog post that goes into much further detail and will post soon.

Re:Show HN: ClapChat – Instant messaging for HN users by JoeCortopassi on Saturday December 24, 2016 @01:16PM (#13250925)
Btw, we also plan on open sourcing all this. So everyone will be able to give feedback and contribute. The hope is it becomes a really useful tool for the community
Re:Show HN: ClapChat – Instant messaging for HN users by rokhayakebe on Saturday December 24, 2016 @08:09PM (#13252347)
You should offer HN Auth As a Service/Platform so that others can easily build around it and users can easily auth into others services.
Re:Show HN: ClapChat – Instant messaging for HN users by todd3834 on Saturday December 24, 2016 @01:13PM (#13250910)
In a way, it's kind of like validating a domain name using a TXT record.
Re:Show HN: ClapChat – Instant messaging for HN users by truebosko on Saturday December 24, 2016 @04:32PM (#13251705)
Neat. I remember my days on Something Awful Forums and many did the same thing for various integrations. Ten years later the technique still works.