Prenda Law, the Internet’s most notorious firm, has been caught red-handed—deliberately sharing porn on the Pirate Bay and then suing those who share it.

Prenda is likely the best known “copyright troll” firm, meaning it stands accused of owning a copyright on a file, then creating a business plan over suing or extorting people who might have pirated it. Its demands are harsh—pay up a settlement fee, or we’ll publicly sue you for sharing pornography—and aren’t necessarily even aimed at the people who did the pirating.

But Prenda, which is currently facing an epic fallout where it’s getting fined by court after court, has just been smacked with its most damning evidence yet.

Internet provider Comcast has confirmed, in response to a court order, that a Pirate Bay user who used the name sharkmp4 originated from the same physical address as Prenda. In other words, it appears Prenda deliberately put specific porn titles on the Pirate Bay’s search engine, hoping it could drop lawsuits and legal threats on users who pirated them.

Sharkmp4’s 44 uploads—all porn—include cinema like Nina Mercedez: Popular Demand, which is among the titles Prenda has tried to sue other people for pirating. Comcast actually made the confirmation August 6th, though the company’s letter wasn’t entered into the public record until Thursday.

In a delicious bit of irony, Comcast identified Prenda through sharkmp4’s Internet protocol (IP) address, a spoofable marker that identifies a computer’s Internet connection. It was through IP addresses—BitTorrent’s default settings show your IP address to anyone you upload to—that allowed Prenda to cull its initial list of names of who to sue in the first place.

H/T TorrentFreak | Photo via christopherdombres/flickr | Remix by Fernando Alfonso III