USPS filed a patent for BlockChain-Based secure voting system FEBUARY 7, 2020
http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1=20200258338.PGNR.&OS=&RS=
https://www.zerohedge.com/crypto/usps-just-filed-patent-blockchain-based-secure-voting-system