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Re:OAuth for the Open Web by dane-pgp on Saturday July 07, 2018 @07:48PM (#17481328)
You mention "URL (or email)", so I think it is worth pointing out that there is a standardized way of converting an email address into an HTTP URL, namely WebFinger.

The RFC even includes an example of doing something very similar to this use case:

https://tools.ietf.org/html/rfc7033#section-3.1

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