1- Go to computer screen in polling place and select secret anonymous number off screen
2- It prints out on your dispensed ballot and only you know what it is
3- When you vote you get your unique xerox copy, original stays in machine like always
4- Google your polling place when you get home, to see if your vote was counted as you voted
5- If not, now your xerox proves your vote was stolen and with the evidence you can expose corruption
This technology already in place millions of times a day for lottery tickets, credit card purchases, sales receipts.
It is false to criticize that this would enable bribery or blackmail, as a third of all votes are already absentee and they are subject to third party tampering already like bribery and blackmail.
The only people to lose with traceable anonymous ballots would be the ones who want to steal elections.