Open source voting software is not sufficient. Paper ballots are better, but I suspect that electronic + verified paper receipt + an audit process is a fuller s

Open source voting software is not sufficient. Paper ballots are better, but I suspect that electronic + verified paper receipt + an audit process is a fuller solution. Paper alone can be more easily locally subverted, electronic alone can be more globally. But if you have to alter both an electronic record/reporting and the paper ballots in a way that correlates then you have a better resistance than either paper/electronic alone.