> Having some way to anonymously verify your vote is an important part of election integrity IMO.
If you can verify your own vote you can use the same method to verify your vote to someone else, opening up the voter to the pressures that motivated voter privacy. Like payments for voting right or threats for voting wrong. So in some measure individual vote verification would trade transparency for vote coercion and selling.
There is nothing stopping those now as you could just have someone do the same for mail in votes. Also, if someone is threatening you they could also be forcing you to pull money out of an ATM or commit murder for them. It sounds mostly like a strawman argument. Being able to verify your vote counted as intended is IMO way more important than the possibility that someone is blackmailing you and that has also stole a hash or digital signature to check your vote.
It doesn't have to involve something adversarial like theft - a bigger risk than coercion is explicit bribery. If you can prove that you voted for something, then you can prove your vote in exchange for a bribe.
The reason every functioning democracy uses a secret ballot is that coercion and bribery were trivial wherever the ballot wasn't secret. Bribery might sound uneconomical for a national election, but there will be plenty of local elections using the same machines where it could easily make the difference.
People taking bribes to vote a specific way are already likely trying to cheat the election for bribes. You're talking about people that are on meth that will do just about anything for money. If all else they could have a sting where the police says they'll give them triple the money if they narc and then arrest them for selling their votes and others for paying for vote manipulation.
If you can verify your own vote you can use the same method to verify your vote to someone else, opening up the voter to the pressures that motivated voter privacy. Like payments for voting right or threats for voting wrong. So in some measure individual vote verification would trade transparency for vote coercion and selling.