發送短信 : Blockchain supported security functionality for internet of things (IoT) systems

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|  __ \\    / _ \\   /  ___||  |  ___||   / ___// 
| |  \ ||  | / \ || | // __    | ||__     \___ \\ 
| |__/ ||  | \_/ || | \\_\ ||  | ||__     /    // 
|_____//    \___//   \____//   |_____||  /____//  
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