This is probably the most clear example of what manipulation looks like on BTC. As the price got near the trend-line support that has been building over the weekend, a trader on Bitfinex with deep pockets started shorting aggressively to try and tank the price under $6300. About 2000 BTC in shorts were opened in about 10 minutes:

Here is the support trend-line on the 1-hour chart:

I'm almost certain the intent here was to cause a flash-crash, but the attempt failed as you can see. This could very well be the same entity that opened a shit-load of shorts last week near the bottom @ $6000.

There is someone out there with very large short position, that is down a lot of $$$ since price bottomed out last week.

Is the market primed for another short-squeeze?