Self-sovereign identity is a concept where natural and legal persons can store their own identity data on their own devices, and provide it efficiently to those who need to validate it, without relying on a central repository of identity data. It is an interesting concept that could help in the application of eGovernment's once-only principle, with a citizen-centric approach in contraposition to the traditional government-centric approach. This means that the citizen should request only once a…

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