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Re:Ask HN: Does anyone actually use Keybase? by michaelmior on Tuesday September 25, 2018 @03:14PM (#18069504)
Sounds like what Telegram Passport is trying to do.

https://telegram.org/blog/passport

Re:Ask HN: Does anyone actually use Keybase? by chrismatheson on Wednesday September 26, 2018 @04:12AM (#18073827)
Its a much bigger stretch to have companies change the underlying method of verification instead of the method of transport though ...