There are cryptographic schemes where you can verify that a vote was counted but not how it was actually cast. Physical ballots going through an optical scan m

There are cryptographic schemes where you can verify that a vote was counted but not how it was actually cast. Physical ballots going through an optical scan machine sometimes have an id stub that gets detached before they go into the counting pile -- imagine that it wasn't possible to add a stub to the "counted" list without also adding a ballot.