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If it returns the Steem on the Bittrex exchange platform then the victims can sell it into other cryptocurrencies.

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Bittrex already asked rightful owners to prove ownership and a bunch of them have filed tickets doing that. But so far I've not heard anyone got anywhere and Bittrex's last communication on this made it sound like they believe Sun's interpretation of who has rightful ownership (whoever the blockchain last said did, regardless of when the chain itself was compromised).