Cryptocurrency hackers laundered close to $4 million via cryptocurrency mixer Tornado Cash, according to blockchain security firm Pecksheild. The funds moved were stolen more than three months ago from the decentralized finance protocol Unizen and the Bahrain-based crypto exchange Rain. On August 7, Pecksheild reported that the wallet address linked to the hack on Rain exchange moved 1,155 ETH worth $2.9 million to the popular cryptocurrency mixing service. The funds have been moved for the first time since the attack on April 29. Crypto investigator ZachXBT found out that the perpetrator had …