How Bitcoin transactions were used to track down the 23-year-old South Korean operating a global child exploitation site from his bedroom

(CNN)For almost three years, “Welcome To Video” was a covert den for people who traded in clips of children being sexually assaulted. There, on the darknet’s largest-known site of child exploitation videos, hundreds of users from around the world accessed material that showed the sexual abuse of children as young as six months old. Then…

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