[victor_vhv]

I live in Spain, and we have paper-based elections. Similar to what I've read from other comments, in our system, people are randomly selected to participate in oversight and counting. Different actors in the elections are able to oversee the process and count. Counts are performed by the randomly selected people and sent to headquarters from the site itself. Then, each ballot box count is available for display right after the counts are completed. Ballots are transported by the police to a safe location in case a recount is needed or randomly selected.

I'm leaving out other measures and details, but you get the general idea.

I used to flirt with the idea of a digital voting system, but now I clearly see that it is a problem of scale. It's very difficult to interfere with an election at scale when many independent actors and parallel flows are in place. This is what provides the system with its trustworthiness.

However, I think fraud is moved elsewhere (with campaign funding, fake news, and other methods...), but that's a whole different topic