This is what a lot of states get wrong, with the voting machine itself being the gateway to entering your vote and having it read. For the machines in my Georgia county, it prints a paper ballot that you drop it into a counting/scanner machine, but the issue is that the only thing on the paper is a QR code that is likely encrypted (nothing readable when scanned with a standard QR reader), so there really isn't a way to verify that the paper you got actually matched what you entered into the ballot machine.

The ideal system is: ballot machine entry -> prints paper ballot scantron style, so the only information the scanner will see is what you've verified is correct -> scanner reads it and enters it into their database while also saving the paper.