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It is quite possible. As Bitcoin and the rest of Altcoin are on a slight bull run in the past week, lots of good news everywhere, and we have people buying in. But a certain someone decide to short 10000 Bitcoin during this period. That is a whopping 74 Million dollars. The next moment, news erupt that Goldman Sachs is pulling away from its ETF proposal. Bitcoin went crashing a 15% upon this news.

This is highly suspicious and will certainly raise a red flag. Manipulation is common in the cryptocurrency world, and this is just another example of how the whole market is being played. I suspect this man must have inside information of this Goldman Sachs deal to be able to pull off such a high stake bet. 

Don't be surprise if he or others are shorting other Altcoins too. This must be the greatest night for them.

It's quite possible. In order for someone to have shorted 74 million in BTC they were either a single wealthy investor that wanted to create a panic sell, thereby profiting from the weak hands selling off their shares or forcing stop losses to trigger or it was the work of an institutional investor looking to accomplish the exact same thing.

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Well we can t tell if the person is working for Goldman Sachs but in my opinion this person had some insider information. At a normal market this would be illeagal because of Insider Trading.