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You mention Keybase as one of those accounts, but isn't this one of the goals of Keybase? See: https://keybase.io/docs/command_line https://keybase.io/docs/comm

• fiatjaf 9y ago
  No, Keybase uses these social network proofs to verify the ownership of the public key so you can encrypt messages to it, like what a "web of trust" would do in traditional public key directories. Since they need public proofs, email will not be supported, for example. Also, they're very slow[1] in adding more providers, or perhaps they don't want more providers. But yes, I think the database Keybase is building can be used for a login system somehow. [1]: https://github.com/keybase/keybase-issues/issues/518 https://github.com/keybase/keybase-issues/issues/518