Bitcoin services such as tumblers are often available on Tor, and some offer darknet market integration.A research study undertaken by Jean-Loup Richet, a research fellow at ESSEC, highlighted new trends in the use of Bitcoin tumblers for money laundering purposes. A common approach was to use a digital currency exchanger service which converted Bitcoin into an online currency (such as gold coins in your everyday online games) that will later be converted back into money.