"During a four-week period, the research team tried out their tool on 10,000 adverts. It correctly identified about 90 per cent of adverts that had the same author, with a false positive rate of only 1 per cent. One of the bitcoin wallets they tracked down was responsible for $150,000 worth of sex adverts, possible evidence of an exploitation ring."
https://www.newscientist.com/article/2145355-ai-uses-bitcoin-trail-to-find-and-help-sex-trafficking-victims/
https://www.newscientist.com/article/2145355-ai-uses-bitcoin-trail-to-find-and-help-sex-trafficking-victims/