How do you figure you’ll get your personal identifying information uploaded into the blockchain?
I don’t see how that could happen.
Your personal identifying info does not need to be published on the block chain for this to be a problem. Your public key uniquely identifies your votes.
Suppose Alice wants to sell her vote to Bob. Alice submits her vote on the block chain per Bob’s instruction including her public key and a digital signature proving she has the private key. Bob wants to verify the Alice kept her part of the deal and has her send the public key to him signed with a digital signature proving again that she has the private key. Now Bob can look up Alice’s vote on the block chain to verify she kept the deal.