Khalifa Toumi is a senior researcher and a blockchain architect at IRT SystemX. He has received his Ph.D. in Computer Science from Telecom Sud Paris (TSP) in 2014. He worked in SAGEMCOM as a software engineer for one year. He was then an innovation engineer with the CNRS SAMOVAR Lab, Telecom SudParis. He was involved in several European and French research projects. Khalifa has several publications in journals and conferences related to Blockchain technology, security monitoring, trust management, and security policies specification for distributed systems.