According to the US big V, US post applied for a patent of “secure voting system” on February 7, 2020, which uses the blockchain access layer. Recently, the U.S. post office has become a storm eye during the epidemic period. This year’s new crown epidemic is likely to cause as many as half of US voters to vote by mail in the presidential election in November. This has made the US Post Office, which provides related services, increasingly attracted the attention of both the democratic and Republican parties. The reform of the post office to reduce costs has become the focus of recent controversy. < / P > < p > “voting system can take advantage of the security of blockchain and mail to provide a reliable voting system.” The patent application states that “registered voters receive a computer-readable code in an email to confirm their identity and confirm the correct ballot information in the election. The system separates voter identity from voting to ensure anonymity of voting, and stores votes in distributed ledger blockchain. ” < / P > < p > the patent application form shows that the applicant is “U.S. Postal Service”. Obviously, this may be one of the strongest signals that the US government welcomes the blockchain. < / P > < p > the patent application states: “voters usually want to be able to vote for elected officials or other issues in a convenient and safe manner. In addition, those who hold elections want to be able to ensure that the results are not tampered with and that they actually match the votes cast. In some embodiments, the blockchain allows various types of necessary data to be tracked in a secure manner and allows others to easily confirm that the data has not been changed. ” < / P > < p > as interesting as the patent itself, the application came before the coronavirus caused serious damage to the United States, and long before authorities and mainstream media discussed the idea of voting by mail every day.