1. Pilkington, M.: 11 blockchain technology: principles and applications. Res. Handb. Digit. Transform. 225, 225–253 (2016)
2. Zheng, Z., Xie, S., Dai, H.N., Wang, H.: Blockchain challenges and opportunities: A survey. Work Pap.-2016 (2016)
3. Lin, I.C., Liao, T.C.: A survey of blockchain security issues and challenges. IJ Netw. Secur. 19(5), 653–659 (2017)
4. Ruta, M., Scioscia, F., Ieva, S., Capurso, G., Di Sciascio, E.: Semantic blockchain to improve scalability in the internet of things. Open J. Internet Things (OJIOT) 3(1), 46–61 (2017)
5. Panarello, A., Tapas, N., Merlino, G., Longo, F., Puliafito, A.: Blockchain and iot integration: a systematic survey. Sensors 18(8), 2575 (2018)