Last week, hackers stole around $534 million worth of cryptocurrency XEM from Tokyo-based exchange Coincheck, and now, Reuters reports, the hackers behind the heist are trying to sell the stolen cryptocurrency. Jeff McDonald, vice president of the NEM Foundation, the company behind XEM, told Reuters that he had tracked down an account holding the coins and those in possession of the stolen XEM were trying to sell them on six different cryptocurrency exchanges. "He is trying to spend them on multiple exchanges. We are contacting those exchanges," said McDonald. He also told Reuters that he couldn't yet determine how much of the stolen coins had already been spent.