A tool for the data notarization with the Blockchain to ensure security and privacy

This paper will describe a trustworthy blockchain-based framework to ensure secure, immutable and pseudo anonymized data collection at field level. This paper will describe the context in which the framework is being conceived and developed, starting from the analysis of the state of the art of DLT (Distributed Ledger Technology) and Blockchain, to highlight the potential uses cases in terms of data management, in particular. A specific focus will be given to the FIWARE framework, since the final objective is the creation of a tool for data gathering, as a FIWARE context broker extension. The core of the tool will be the two smart contracts implementing the PoE (Proof of Existence) and the RT-MDN (Reat Time-Monitoring Data Notarization). The smart contracts will be used for the certification of single documents and bulk of monitoring data, respectively. The second case is characterized by a periodicity of production and represent the most innovative part of the work. A first PoC (Proof of Concept) will be implemented, and first early results will be presented as well. The work is being developed in the framework of the EU co-funded "DigiBUILD" project.