1. 1.  X. Li, P. Jiang, T. Chen, X. Luo, and Q. Wen, “A survey on the security of blockchain systems,” Futur. Gener. Comput. Syst., 2017.
   2.  I. C. Lin and T. C. Liao, “A survey of blockchain security issues and challenges,” Int. J. Netw. Secur., 2017.
   3. P. J. Taylor, T. Dargahi, A. Dehghantanha, R. M. Parizi, and K. K. R. Choo, “A systematic literature review of blockchain cyber security,” Digital Communications and Networks. 2019.
   4. S. Singh and N. Singh, “Blockchain: Future of financial and cyber security,” in Proceedings of the 2016 2nd International Conference on Contemporary Computing and Informatics, IC3I 2016, 2016.
   5. A. L. Buczak and E. Guven, “A Survey of Data Mining and Machine Learning Methods for Cyber Security Intrusion Detection,” IEEE Commun. Surv. Tutorials, 2016.
   6. W. Wang and Z. Lu, “Cyber security in the Smart Grid: Survey and challenges,” Computer Networks. 2013.
   7. A. Humayed, J. Lin, F. Li, and B. Luo, “CyberPhysical Systems Security - A Survey,” IEEE Internet Things J., 2017.
   8. M. Conti, K. E. Sandeep, C. Lal, and S. Ruj, “A survey on security and privacy issues of bitcoin,” IEEE Commun. Surv. Tutorials, 2018.
   9. M. A. Khan and K. Salah, “IoT security: Review, blockchain solutions, and open challenges,” Futur. Gener. Comput. Syst., 2018.
   10. M. Banerjee, J. Lee, and K. K. R. Choo, “A blockchain future for internet of things security: a position paper,” Digit. Commun. Networks, 2018.