The US Postal Service has filed a patent on a blockchain voting method:
Abstract: A voting system can use the security of blockchain and the mail to provide a reliable voting system. A registered voter receives a computer readable code in the mail and confirms identity and confirms correct ballot information in an election. The system separates voter identification and votes to ensure vote anonymity, and stores votes on a distributed ledger in a blockchain
I wasn't going to bother blogging this, but I've received enough emails about it that I should comment.
As is pretty much always the case, blockchain adds nothing. The security of this system has nothing to do with blockchain, and would be better off without it. For voting in particular, blockchain adds to the insecurity. Matt Blaze is most succinct on that point:
Why is blockchain voting a dumb idea?
Glad you asked.
- It doesn't solve any problems civil elections actually have.
- It's basically incompatible with "software independence", considered an essential property.
- It can make ballot secrecy difficult or impossible.