A cachier roll, that is locked into the voting machine. The voter selects an option on the machine, each option has a number. Once the voter confirmed it's pick

A cachier roll, that is locked into the voting machine. The voter selects an option on the machine, each option has a number. Once the voter confirmed it's pick the number is printed on the cashier roll and "rolled" into view for the voter (a small slit window of some transparent material will do). The voter can then see the number was printed. After the voter presses the "done" button, or leaves the booth, the vote is rolled beyond the window so the next voter cannot see what the previous voter voted. The rolls used can be marked uniquely. The voting machine will print an opening and closing pattern so no votes can be added before or after.