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Self-sovereign identity, or SSI, is the idea that "an individual should own and control their identity without the intervening administrative authorities." This movement seeks to grant control over personal data to individuals rather than leaving access to private credentials to administrative third parties. As a result, "a person’s digital existence is now independent of any organization."  It is also called digital identity.
In 2016, Christopher Allen, an Executive Director and Principal Architect of Blockchain Commons, wrote an article "discussing the history of digital identity and laying out principles for creating a new sort of identity, based on individual control and human rights." Since then, the notion of self-sovereignty has shifted to a push for individual freedom in making decisions about assets, without any intervention from other gatekeepers. Allen identifies the 10 principles of self-sovereign identity as existence, control, access, transparency, persistence, portability, interoperability, consent, minimization, and protection. 
How has this industry developed? Has it gathered public or commercial attention? Are established companies working on / using it? Where is it being utilized?
SSI has the potential to create a singular identity for ever individual. As a result, with credible and verifiable identification, SSI can eliminate the need for numerous online passwords, secure private messaging, and personalize internet use, essentially creating a trustable internet with more fluid interactions. 
Other Relevant Companies and Organizations
- Decentralized Identifier Working Group
- DIF (Digital Identity Foundation)
- Sovrin Foundation
- Trust Over IP Foundation
- Verifiable Credentials Working Group
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