Looks like someone is really nervous about current bitcoin prices and they want to facilitate shorting bitcoin:

https://www.bloomberg.com/news/articles/2017-12-04/the-next-big-short-hedge-funds-prepare-to-trade-against-bitcoin

We'll see how it goes. We have certainty whales on our side (those of us that are near %100 BTC just want to see it go higher) which will fight the shorts and try to liquidate them. But its clear someone up there wants to short it into oblivion, we'll see who wins. Everyone that has been calling tops for 2017 has been proven wrong thus far, it just keeps going higher. The psychological "collectible" effect of the 21 million limit is very strong and creates a permabull market now that a lot of people are catching up with it. Im on a position where I don't really care if there is a crash, I wouldn't lose money and i know long term we are going higher, would liquidate some of my alts to buy cheaper anyway.