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Decentralization of user identity is the one of key parts of Web 3.0, where a user controls his credentials without any external parties. This way of identification and authorization of users is very reliable and functional in the new era of decentralized Web, public blockchains and smart-contracts. Smart contracts are a special software type that has recently become widespread. This article is about user identification based on smart contracts, working with addresses, anti-hacking measures, administrative access to the system.