Affiliation: | 1.Institute of Software, Chinese Academy of Sciences, Beijing 100190, China;2.University of Chinese Academy of Sciences, Beijing 100049, China;3.College of Computer Science and Information Technology, Imam Abdulrahman Bin Faisal University, Dammam 1982 Saudi Arabia;4.Block Chain Research Center, Blue Helix, Grand Cayman KY1-1100, Cayman Islands |