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With regards to the DMCA: you do not have to provide proof. Rather, you state under penalty of perjury that you are the owner. The site in question is obliged to remove it, until the uploader disputes your claim of ownership of content.
If and when that happens, you'll have to take the uploader to court, where the model releases, ID scans, your testimony and the model's testimony will suffice to prove ownership. Of course, registering your copyrights will make it even easier.
Realistically, the scenario where your claim of ownership of the content actually gets disputed is an unlikely one. If a site you send a DMCA takedown notice to requests proof before taking action, they are already in violation of the DMCA. Your stated claim of ownership, under penalty of perjury, is all that's needed.
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