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Nowadays, Internet of Things (IoT) applications are widespread in different scenarios, such as industry, mobility, healthcare, and agriculture. A relevant share of the credit is due to the Blockchain technology, which provides important features to IoT services, such as decentralized validation of transactions as well as immutability and traceability of the transactions. In this paper, we propose a Blockchain-based data notarization system for mobility services. First, we present an IoT-based crowd monitoring system aimed at counting the number of people in a specific area and providing information regarding people mobility (i.e., how people move within the city) and dwell time (i.e., the time people stayed at specific places). Then, we discuss our proposed data notarization system focused on ensuring data integrity and immutability of the mobility data collected by the crowd monitoring system, regardless of the used …