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SSI — an answer to data privacy issues — is an idea that each individual should be in charge of their own digital personal information. Data breach scandals have revealed that personal data collection has become the backbone of modern-day surveillance of citizens. SSI provides an alternative to the siloed model, where users have to undergo a new (burdensome) registration for each service they want to use. Users can consensually deploy only the information that is relevant in a given context, so that other pieces of their personal data remain confidential. As a technology relies on decentralisation, distribution of data and distribution of records, the blockchain is ideally suited.