- a service that mixes one person’s bitcoin transactions with another, such that the coins you receive back are with different inputs and outputs than the ones that you originated. A mixer or mixing service, sometimes called a tumbler, obfuscates an otherwise publicly visible transaction on the Bitcoin network, providing added privacy.
It has also been used by hackers to mask their trail after theft of coins.
Hey, what was that thing you mentioned, you know, about "losing the trail"?
A mixer. A mixer is what you're talking about.
After we got hacked, we were able to trace the bitcoins to a suspected hacker’s wallet address until the coins were transferred to a mixer, where the trail went cold.