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I sold it close to $5200. Bitfinex is allowing you to do this. I don't think a "real" person took the other side. I am long altcoins since a few days but BTC is taking all the light :(.

So you made $550 per bitcoin profit? Good trade! Personally I would not have the nerve to go short bitcoin. It could spike (gap) 100% to the upside on a piece of good news. For example, CBOE may get approval to trade bitcoin futures. If they do, I reckon that may cause the price of bitcoin to double in seconds.