There are no checks on UDRP complaints about who files them, if the claims make any sense, if the complainant exists, or anything else.
When I do a complaint, for example, I will often leave in [to be amended upon registrant identification] as a placeholder for additional observations that might come up.
But WIPO has simplified this so that if you want to know who owns Example.com, you can file a UDRP Complaint saying...
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1. Identity or Confusing similarity
I run Exampleco and "example" is our trademark.
2. Legitimate rights
The Respondent has no legitimate rights to use our mark.
3. Bad faith.
The domain name was registered and used in bad faith.
This complaint will be further amended when the registrant is identified.
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That's it. That's all you need.
Within two days, you'll have the registrant data from the registrar (behind any whois privacy) and you can say that you want to withdraw the complaint, collect your refund, and then you have the data.
This is going to be great for brokers and domain investors who used to have to put in a lot of time to track down domain registrants.