The main and challenging evolutionary process that leads towards the so-called Smarter City is still represented by the optimization of the Intelligent Systems for the Quality of Life (QoL) and the Quality of Services (QoS), and by the integration of heterogeneous IT services and different networks. The scientific interest in this field consists of promoting innovative solutions by use of Information and Communication Technology (ICT) able to collect, analyse and obtain value added from a large amount of data generated by several sources: IoT devices, sensor networks, wearable devices as well as sensor grids, widespread within the urban environment. Furthermore, creating synergies and integrating different enabling technologies and informative platforms, remains the most challenge to overcome in order to obtain the optimization of the services and the quality of life. The Smart City involves the implementation of digital strategies that are necessary people-centred and lead into high technology-based innovations to build more capacities and opportunities. In this context, this paper intends to investigate the possibility to integrate the innovative and multi-purpose Blockchain Technology in the smart city evolutionary process, and in particular in the Smart Environment and Smart Mobility by allowing renewable energy sources traceability and by providing information about the kind of energy used to refuel, for example, the selected vehicle. The expected result consists of more user awareness regarding the environmental and energy sustainability.