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When Colonial Pipeline was hit by ransomware on May 7, 2021, it paid 75 bitcoins to restore its systems. But the money was not entirely lost. The FBI was able to trace it as it jumped from one digital wallet to another. At one point, on May 27, 63.7 of the bitcoins were transferred to an address and stopped moving. The FBI got the private key to unlock that bitcoin wallet and was able to retrieve the funds.