That's the same problem we have now. Democrat precincts have padded voter rolls. College students can say they unregistered in their home and register a second time on campus. Illegals can present various documents. For example (Illinois): A person may also demonstrate sufficient proof of identity by submission of a photo identification issued by a college or university accompanied by either a copy of the applicant's contract or lease for a residence or any postmarked mail delivered to the applicant at his or her current residence address.
I never claimed that problem was solved and acknowledged it from the very start. After that in the current systems we have presentation of ID on some states or nothing at all in others. Then voting on hackable machines or error-prone paper. Those voting day problems are solvable. Registration does no have easy solutions.
And it’s the biggest problem, and until you fix that everything else is just jerking off.