The main activity of the HELEN project is the support of cryptocurrency mixing systems in the TOR network. At the moment, for various reasons, BITCOIN-MIX projects is gaining popularity. Their task is quite simple. If it is necessary to hide a large transaction, the client transfers a certain amount of cryptocurrency to the service account and indicates the final receiving address. The system automatically starts sending funds to the final address of the recipient in small transactions from exchanges and other services until the agreed amount is received in full. Fees for mixing services are high, while the maximum transaction time for any amount reaches only 24 hours.