Most bitcoin tumblers are anonymous. You deposit the money and you specify the withdrawal addresses. The owner of the tumbler doesn't know you personally. The t

Most bitcoin tumblers are anonymous. You deposit the money and you specify the withdrawal addresses. The owner of the tumbler doesn't know you personally. The tumbler itself is just some code running on some anonymously rented server. And then we have things like ZCash, which are designed to make tracing impossible.