The Usa greenback would be the Formal currency of The us and several other other countries. The Coinage Act of 1792 launched the U.S. dollar at par with the Spanish silver greenback, divided it into 100 cents, and authorized the minting of cash denominated in dollars and cents. 从这些示例中可以看出，在人们与外界隔绝时，以太坊等加密货币可以让他们不受限制地进入全球经济，此外当地货币由于... https://vanitytron.org