Didnt the Democrats say the Russians had hacked Trumps election in 2016? https://www.vox.com/world/2017/6/13/15791744/russia-election-39-states-hack-putin-trump-sessionsThere are no voting practices that arouse suspicion in the USA. Our elections are completely secure and legitimate. This has been proven over and over again.
There are partisan hacks, Trump worshippers, and fascists who didn't like the outcome and want to end elections in favor of a Trump dictatorship. There is no amount of evidence or facts that could possibly appease them. No matter what you do, they will simply make shit up. They are utterly unencumbered by evidence-based thinking.
If you have such a fail safe system then whats all the hot air? The internet is full of the Russia Trump 2016 stuff.