An anonymous hacker who stole more than US$600 million ($813m) from the decentralised finance platform Poly Network this week has returned virtually all of the money — and apparently turned down a half-million-dollar reward offered by the company for exposing its security vulnerability.The bizarre outcome caps off an unusual cryptocurrency heist that has been called the biggest in industry history.In a message posted to Twitter on Thursday, Poly Network said the hacker — whom it is calling "Mr. White Hat," a term that refers to an ethical hacker who raises awareness of security flaws — has returned all of the stolen funds, save for a small percentage that had been frozen by the cryptocurrency issuer Tether following the hack.
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