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Smart cities heavily rely on technological enablers for their success, and more specifically on the IoT. This network, which will reach billions of components, now suffers from several constraints. In recent research, the blockchain has been proposed to provide answers on the limits of the centralized model, and on security. The integration of blockchain and IoT, however, still has issues that are being resolved, which are energy consumption, computing capacity, and storage capacity, due to the low capabilities of connected objects. In this article, we present our lightweight framework that we implemented for the integration of blockchain and IoT, and simulating on machines close to the configuration of the majority of current connected objects.