A Two-Factor Authenticated (2FA) Proof of Shoe, means two shoe selfies with different backgrounds and shoes, which reduces the sock puppet coefficient even more.
twetch#13837 6.7y
So the bottom line is: Proof of Shoe reduces the number of verified sock puppet accounts any one Twetcher can operate to the set of IRL people one can influence to take shoe selfies.
https://twetch.app/t/aea24bd673638bd191b1c500d0e9fa9d3508cbc04f99fa9829fec84f91a39759