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This paper presents an architecture, based on Distributed Ledger Technologies(DLTs) and Decentralized File Storage (DFS) systems, to support the use ofPersonal Information Management Systems (PIMS). DLT and DFS are used to managedata sensed by mobile users equipped with devices with sensing capability. DLTsguarantee the immutability, traceability and verifiability of references topersonal data, that are stored in DFS. In fact, the inclusion of data digestsin the DLT makes it possible to obtain an unalterable reference and atamper-proof log, while remaining compliant with the regulations on personaldata, i.e. GDPR. We provide an experimental evaluation on the feasibility ofthe use of DFS. Three different scenarios have been studied: i) a proprietaryIPFS approach with a dedicated node interfacing with the data producers, ii) apublic IPFS service and iii) Sia Skynet. Results show that through properconfiguration of the system infrastructure, it is viable to build adecentralized Personal Data Storage (PDS).

On the Efficiency of Decentralized File Storage for Personal Information Management Systems