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It hasn't been affected because all the exchanges have frozen trading

Trading is still active, just no deposits/withdrawals.

Are there short sale markets for Steem?

I think it makes sense for the price not be affected - this was an isolated attack on a few accounts with only a small amount stolen. The Steem protocol itself was never compromised. The faith in Steemit is still there as the team responded very quickly and contained the attack.

Even if the hacker got his stolen funds to Bittrex and was able to sell, $85,000 (128 btc) of sells would only drop the price by 2-4%.

The majority of all Steem is in Steem Power so it's secured against theft even in the event of a hack.

My point was about panic selling, not so much about dumped stolen coins.

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