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Yeah, Some report that Bittrex potentially caused this sell-off. Don't think it is a coincidence.

Yeah thats what i heard too, could just be a rumour or some whales at work.

Bittrex has one of the largest volumes for altcoin markets, correct? Would make sense, since those are the easiest coins to shift to bitcoin if you want to take advantage of the fork and don't know that it already happened.

Yes i think we passed that block already.