Open source Voting System

Politics aside if you were to create an open-source voting system how would you design it to be efficient, secure, and tamper-proof?

I was thinking of something like using blockchain This would create a provable mathematical audit trail for each transaction then. Combined that with using your SSN and a unique ID from the voter registration. You would have proof of every valid vote basically 2fa. Then data will be exported to a write-only USB drive once an hour.

@omnipotens Electronic voting can't be audited the way paper voting can. The last election should make it obvious what happens when a large portion of the population can't trust the voting system and that's what you get with electronic voting.

Also: you don't (and should not!) need an SSN to vote. The US has no unique ID numbers.

@swiley Well every legal citizen that is allowed to vote has a social security number that is unique to the person. As for paper audits are full proof is the biggest lie ever told in my opinion. If money can be counterfeited so can ballets. We can still use both but I believe the answer is in technology. With 2 systems the offline voting machine and a registered voter chain. Each transaction can be matched and tagged as valid duplicated or not in the system.
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@omnipotens @swiley regarding SSNs, we still have situations where multiple people have the same SSN.

https://www.nbcnews.com/technolog/odds-someone-else-has-your-ssn-one-7-6C10406347

Of course this is a flaw with the SSN system itself, as they don't want to do anything about this to prevent it.

Also, not every American has a SSN, though functioning in society without one is next to impossible. When my kids were born, i was not required by law to sign them up for a SSN (but had I chose not to, it would have made life hell)