1. Department of Computer Science, Virtual University of Pakistan, Lahore, Pakistan
2. Institute for Distributed Ledgers and Token Economy, Research Institute for Cryptoeconomics, Vienna University of Economics and Business, Wien, Austria
3. Department of Electrical Engineering, Computer Engineering and Informatics, Cyprus University of Technology, Limassol, Cyprus
4. School of Electrical and Electronic Engineering, Technological University Dublin, Dublin 24, Ireland
5. School of Information Science and Engineering, NingboTech University, Ningbo, China
6. Department of Computer, College of Science and Arts in Ar Rass, Qassim University, Ar Rass, Qassim, Saudi Arabia