Confirming a user is the Wikipedia user they say they are?

Question

If a user on my site said they were the Wikipedia user "example" what would be the best way of confirming they are indeed that Wikipedia user & not an imposter?

Answer 1

Ask them to put something on their user page, then check the history to see whether it was really them who put it there.

Answer 2

Wikipedia also supports OAuth, so you should be able to ask them to authenticate with OAuth to prove that they are who they say they are.

Answer 3

Don't forget to check the History tab to double check they were really the one making the comment