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This photograph shows a physical imitation of the Bitcoin cryptocurrency.

An anonymous hacker stole $600 million in cryptocurrency, then gave it back

By Brian Fung, CNN Business An anonymous hacker who stole more than $600 million from the decentralized 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

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