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Reading https://blockstack.org/posts/blockchain-identity it states Blockstack is the largest, most popular blockchain identity system, with 50,000 registered identities. but reading the available papers https://blockstack.org/papers there is no significant detail on how blockstack implements digital identity ?
This is in contrast to uPort who also implement blockchain identity but have a detailed evolving whitepaper on how this is achieved : https://uport.me/library/pdf/whitepaper.pdf
We need to consider the fact that we do not need a blockchain at all, and could be implemented perfectly well using a regular relational database. But while you read through this article that I have recently posted on linkedin, you would not only understand how a blockchain can solve such a use case but also a need to have a technology to solve this.
