According to a recently published patent, the United States Postal Service has received a patent for a mail-in voting system using blockchain technology. The abstract states:

"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."