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The Mobile Computing (MC) has seen a leap to-wards Mobile Edge Computing (MEC) in recent years. The significance of this change is to address the inherent issues caused by traffic latency and data security of traditional cloud architectures, which are not, suited to performances of modern IoT applications. Software-Defined Networks (SDN) and Blockchain (BC) technologies are dedicated to resolve the above problems by providing low latency and enhancing network infrastructure security. Although mobile resources are limited, it is difficult to meet the security needs of mobile users without offloading their data. Therefore, in this paper, we propose a secure architecture enabling SDN and BC to provide mobile data offloading on Small Cell Networks (SCN). Each mobile device can use mobile data to transfer its data to the central cloud via either the public BC or the Wi-Fi and Device-to-Device (D2D …