發送短信 : Security of contract and the pursuit of fairness

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 / ____|| | || | ||   ____     |  ___||   ____    
/ //---`' | || | ||  |    \\   | ||__    |    \\  
\ \\___   | \\_/ ||  | [] ||   | ||__    | [] ||  
 \_____||  \____//   |  __//   |_____||  |  __//  
  `----`    `---`    |_|`-`    `-----`   |_|`-`   
                     `-`                 `-`