Comment by saturn8601

Why not? A ballot number is a unique identifier that can theoretically be tied to a voter id. This is how I recall seeing it work when I was part of a ballot recount. Maybe im remembering wrong but I do clearly remember the process of voting in this last election. In my state, you are required to sign a slip with the ballot number written on it. The slip is then compared to the signature on record(done during registration). This completes the sign in process. Upon successful completion of this process, that slip is cut into two (there are two copies of the ballot number on the slip) and one copy is handed to the poll worker who programs the machine with that ballot number. If the machines produce a paper record(as my state does), you can just match the paper record which should contain the ballot number with the voter id.

The issue is that these are likely different databases and would require active participation by the states. Blue states will probably find a way to resist. (Maybe destroy the voting records quicker?) Although they can probably still find party registration.