USDO is a Stablecoin linked to the US dollar supported by multinational commercial banks. The value of each USDO is completely equivalent to 1 US dollar, and the market value of all USDOs is supported by equivalent legal currency deposits guaranteed by commercial banks. USDO, as a blockchain based cash payment voucher, has the characteristics of immutability, transparency, security, and convenience. USDO combines the advantages of Fiat money and Cryptocurrency, and supports safe and fast conversion between these two financial assets....