“…Blockchain is a revolutionary distributed ledger technology which provides decentralized and transparent data management in an auditable, immutable and irreversible manner based on consensus among different parties. Blockchain is used or being though as a solution in various fields of IoT (Kshetri, 2017) such as government, energy, financial transaction, transportation, fleet monitoring and management, smart cities, healthcare, farming, defense and public safety, logistics and more-with the aim of secure IoT data transfer and storage (Panarello et al, 2018), data exchange with access control policies among connected things as cars (Alsadi et al, 2019a;Alsadi et al, 2019b), identity management and authentication (Shafagh et al, 2017;Pinno et al, 2017;Nuss et al, 2018;Hammi et al, 2018), monitoring IoT assets (Ouaddah et al, 2016), time stamping and similar high security related services to enhance trust between IoT entities (Fernández-Caramés and Fraga-Lamas, 2018).…”