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A blockchain ID is a unique identifier that is secured by a blockchain. Blockchain IDs are simultaneously secure, human-meaningful, and decentralized, thereby overcoming Zooko's triangle. Users can cryptographically link their blockchain ID to a profile containing arbitrary information e.g. name, biography, website link, public key, and social graph, by associating a hash of the profile with the ID registered on the blockchain. Blockchain IDs work with Blockchain Auth to eliminate passwords and third parties from the user authentication flow of websites and applications, creating a decentralized Single Sign On system.

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