Hi Tor Talkers and Scott Arciszewski,

you wrote:
I was curious if anyone in/around Tor was aware of any
privacy-preserving 2FA initiatives.



maybe banks are
https://en.wikipedia.org/wiki/Mtan#Mobile_TAN_.28mTAN.29

when you have to log in to your phone/handy with e. g. a "living" fingerprint 
it is equal to a mTan generator in which you insert a card and hold it to the 
blinking strings of a bar code at a display to get the calculation done.
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