Samourai Wallet is a non-custodial crypto mixing service designed to obscure the origin of cryptocurrency transactions by blending funds from multiple users.

Quotes that support claims

A mixer like Samourai that does not take custody of the cryptocurrency by possessing the private keys would strongly suggest that Samourai is not acting as an MSB.

Samourai’s mixing service took crypto from multiple users and blended it together to hide its origins.