Have you registered to vote in the United States? Records are corroborated.
Remember, voter rolls are public. My New York City record lists my name, address, party affiliation and voter district information. Anyone can challenge this based on public information, e.g. social media posts, court records, employment records, et cetera, or absolutely nothing.
In New York, you literally write a letter and the Board of Elections opens an investigation. Lots of people do this every year, and the problem isn't them finding anything useful. The problem is them (a) burning tax dollars and (b) knocking off the rolls those who forgot to report minor address changes, e.g. moving within the same building.
> a lot of people voting in various technically illegal ways
Many have looked for evidence of this. Zero has been found. It's a high-cost, low pay-off gamble. Will some people be idiots? Sure--there's a small handful every election. Is this even remotely of concern? Absolutely not.