http://fairhii23nuda5oc7ykidw52c7dfq7r3seuz6lrmbvavh7dizhjz3qqd.onion/blog/the-most-trusted-bitcoin-mixer-a-guide-to-legit-crypto-tumblers
First, it must enforce a strict zero-logs policy, meaning that no connection records, deposit addresses, or transaction histories are saved. If logs are stored, they represent a permanent target for hackers and server auditing, creating an ultimate threat vector.