A smart city is a connected system in which things produce a huge quantity of data. We focused the attention on monitoring the environment quality in urban area by means of a distributed network of small mobile sensors that are devices on the Internet of Things (IoT). Sensors produce digital measurements, useful for investigating and studying the life quality in every part of the city. In our vision, environmental data must be available by everyone and shared with citizens, but it must be unmodifiable. We propose to solve the problem of the sensors data storage and management using a disruptive technology called blockchain. The blockchain responds to the demand of availability and unchangeability and, thanks to the potentiality of smart contracts, makes us able to manage sensor information and implement a control logic. In order to develop the software based on blockchain we chose to apply the SCRUM methodology because of its capabilities of being a flexible, adaptive and iterative methodology.
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