  This article presents the potential use of the Self-Sovereign Identities
(SSI), combining with Distributed Ledger Technologies (DLT), to improve the
privacy and control of health data. The paper presents the SSI technology,
lists the prominent use cases of decentralized identities in the health area,
and discusses an effective blockchain-based architecture. The main
contributions of the article are: (i) mapping SSI general and abstract
concepts, e.g., issuers and holders, to the health domain concepts, e.g.,
physicians and patients; (ii) creating a correspondence between the SSI
interactions, e.g., issue and verify a credential, and the US standardized set
of health use cases; (iii) presenting and instantiating an architecture to deal
with the use cases mentioned, effectively organizing the data in a user-centric
way, that uses well-known SSI and Blockchain technologies.
