If there is going to be online voting, then at a bare minimum there must be a public anonymous API that can be used with the voters key material to validate the

If there is going to be online voting, then at a bare minimum there must be a public anonymous API that can be used with the voters key material to validate their entire voting choices actual choices not counts so that random people at random times can validate that every specific detail they entered was not tampered with, even if this requires semi-technical people to validate, then fraudsters will know there is a risk of being caught. Even one invalid record must trigger an audit by a truly independent third party. Voter keeps a copy of what they submitted along with checksums and cryptographic signatures. Audit logs must be proven immutable with a chain of custody and attestation throughout the entire system. Even admins of the system must not be able to tamper with it even if their life depended on it. Look to vaulting appliances for some mediocre examples on how to start this process. This will need to be a better implementation than the vaulting appliances however and I can not imagine anyone building this for $1.5M. Whatever is built must be submitted to the public for penetration testing along with a large bug bounty program. Invite the best penetration testers from all around the world and encourage them to use whatever hacking and social engineering methods they can dream up and provide them with full legal immunity and a low bar to entry.