Example: in France you get a certificate of vote and a hash that can be looked up to verify your vote is counted, as well as verify what your vote hasn’t been modified. No one else get this, only you.
This is somewhat unrelated to what I posted, but interesting. At what time does voters get this hash? Is it after the cast their vote in which cases why wouldn’t coerces/bribers ask it as receipt that voters had cast their vote in a certain way?