Blockchain and Web 3.0 Solutions: Idena.io and humanode.io are the two leading blockchains in the decentralized identity use case. Idena is personhood verification is presence-based, Humanode is biometrics-based.
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Here is a good summary of the different Proof-of-Personhood #blockchain for identity verification. It’s a bit bias because written by the Humanode team but accurate overall. 
Medium
Revolutionizing identity verification: An introduction to Proof of Personhood (PoP) protocols
In this paper, Proof of Personhood (PoP) protocols — types of identity verification mechanisms that aim to protect digital space from…