If it's possible to have 1 factor authentication, it's possible to have 2 factors. We already have this in a limited form via posting keys vs master keys.
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If it's possible to have 1 factor authentication, it's possible to have 2 factors. We already have this in a limited form via posting keys vs master keys.
Someone smarter than me will need to explain how it is possible with the blockchain technology. I am not sure how it could be done.