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The registrar verifies the identity of the user (in a comment you said that the user is not anonymous towards the registrar). Identification means that each user has some kind of unique identifier. That could be their social security number, their real name + birthday + birthplace or something like that. The registrar uses a cryptographically secure hash ...


OAuth is an authorisation protocol, providing a way to give authorisation to access a protected resource. A by-product of the authorisation process is that the user is authenticated. Technically, OAuth does not have to give you any information about the user. What it provides is a validation that the user has given authority to the application to access ...

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