I could wear a body camera and film myself filling out the ballot and a close up of it as I feed it into the reader. I understand you want to poke holes in my idea and I invite you to do so, but please, let's keep it honest. Yes, it would make it easier to prove who you voted for, but my counters are that you could prove who you voted for in the current system yet we don't have rampant vote buying, it would be impossible to figure out who needs to be paid to switch their vote so you'd just have to pay everyone which is incredibly inefficient, and finally, since paying for votes is illegal, how are you going to set up a system for paying out and more importantly, advertising the fact that you are paying, without getting caught?
I get what you're saying, and I think it would be awesome to have some accountability to make sure that our votes are actually counted.
Here's what I believe is important in regard to "selling votes".
Why the hell would someone buy individual votes when their money can be more effectively spent ensuring that:
1. Candidates are going to do what they want them to do through lobbying/campaign contributions
2. Bills brought up and voted on are influenced/written by the people with money
3. The media (that they own) speaks out for/against the legislation they want.
If I were a billionaire and wanted to influence elections to get what I wanted, the last thing I'd do is attempt to buy votes, thereby putting myself at risk for tens/hundreds/thousands/millions of felony counts.
What I'd do instead if legally give money to Think Tanks to get them to push Agenda X. I'd legally give money to candidates through lobbying/campaign contributions so that they see the "sense" in Agenda X. And I'd legally use the media apparatus to argue for/against something, or at least create confusion on the matter by claiming that there are "two sides" to everything.
Trying to purchase an individual voter's vote is time consuming, ineffective, and outright illegal. Only a complete idiot would do that, when you can be infinitely more effective while not breaking laws by simply handing a politician, Think Tank, or PAC money. Literally handing various organizations money is legal, whereas even trying to buy/sell/trade a vote is illegal and ineffective.