Blockchain - ICBC 2019 Second International Conference, Held as Part of the Services Conference Federation, SCF 2019, San Diego, CA, USA, June 25-30, 2019, Proceedings - Joshi, James; Joshi, James; Nepal, Surya; Nepal, Surya; Zhang, Qi; Zhang, Qi; Zhang, Liang-Jie; Zhang, Liang-Jie (Springer International Publishing : Imprint: Springer, 2019)