This sounds like an excellent opportunity to do a multisig …

This sounds like an excellent opportunity to do a multisig Proof of Shoe (Ms PoS) verification — to do this, Post a shoe selfie with at least N shoes and N + M people. Then each person signs the Post with a verification message identifying their position.
https://twetch.app/t/ddc049d5ca8437fe27f004a5bd279812cdbfd061f944bb9c7539e85187a5cc7f