If America did the bare minimum of voting security that plenty of other civilized countries do we wouldn’t be in this mess. No need to get fancy. Voter ID (either a license or the city hall can provide a free photo ID for people) , no mail in ballots and paper ballots only.
Since both parties don’t want this I can only assume they both cheat.
Any votes "discovered" after the polls closed -- tough toenails, they get tossed.