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Yep. Theoretically they exchange your "dirty" bitcoin for one that has never been on the darkweb. https://darknetmarkets.org/bitcoin-tumblers/ https://darknetm

• jandrese 10y ago
  In practice, the people using those services are ones that are primarily on the darkweb. So you're just exchanging your own tainted bitcoins for someone elses tainted bitcoins. The point is to break the chain of evidence tying you back to the darknet transaction, which works, but still manages to look suspicious as hell. IMHO, it's only a matter of time before someone is convicted of money laundering for using a tumbler service.