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Microsoft is using Bitcoin's network at an attempt to solve this problem: https://identity.foundation/ion/.

From their FAQ: “Just like Sidetree ION is open source. Microsoft has been an important sustaining sponsor, but no more than that.”

Microsoft acquired U-Prove-It way back in 2008 [1]. I wonder if there is any connection between the U-Prove-It approach and ION. The linked article is from Kim Cameron's blog, and if you are interested in identity I highly recommend following his content.

[1] https://www.identityblog.com/?p=939

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