WASHINGTON (Reuters) -The United States on Wednesday imposed sanctions on a virtual currency mixer the Treasury Department said has processed millions of dollars worth of cryptocurrency from major heists carried out by North Korea-linked hackers. The Treasury Department said in a statement that virtual currency mixer Sinbad, which was hit with sanctions on Wednesday, processed millions of dollars worth of virtual currency from heists carried out by the North Korea-linked Lazarus Group, including the Axie Infinity and Horizon Bridge heists of hundreds of millions of dollars.