It seems like pen and paper is currently the best verifiable and immutable voting approach.
That's why we have checksums. We've used computing to put people on different astronomical bodies. There is a way, but it comes with a huge cost. Cryptocurrency strongly hints towards a way to make internet voting viable.
> It seems like pen and paper is currently the best verifiable and immutable voting approach.
The simplest answer is usually the best, but then you shouldn't constrain voting to a single day otherwise it disadvantages large swaths of the population.