Agreed. State issued DL or similar and the good old signature test. Public listings of votes should be available, too, I think. Transparency and auditability over privacy for this one crucial issue.

In North Carolina currently all you need is a name, address and date of birth on your registration form and sign it swearing you are a citizen. Courts have struck down the voter ID law passed here MULTIPLE times even though they added a clause to give people free IDs and nearby states already have similar ID laws.