Cryptocurrency tumbler - Definition from the Hotspot Shield Encyclopedia

A cryptocurrency tumbler (also known as a mixing service) aims to mix a user's digital currency in with currency from other users with the aim of preventing the source or owner of the currency being traced.

In conventional currency storage, one customer will have their currency stored in one single destination. If that destination is identified then the owner of the currency can be traced. If several users funds are mixed together in a combined wallet, only the total sum of the currency will be known. There is no way to identify which currency belongs specifically to which person. This is a great way to protect a user's privacy, but can also be used for money laundering and the mixing of illegally sourced funds.