The Poly Network hacker dubbed “Mr WhiteHat” has returned the final piece of the $610 million that was stolen from the DeFi network nearly two weeks ago. This was possible only after the hacker shared a private key to the multi-signature wallet holding the funds through an on-chain message. Poly Network had previously offered the hackers a $500,000 bounty for recognizing the security flaw and a job as the network’s Chief Security Officer.