This guy has a fascinating explanation of how the banks use regular traders to free up liquidity resulting in losses for the regular traders. In essence if the banks have a large purchase that would drive the price up they work out where a cluster of stop losses would be (an order to sell your currency if the price drops below a certain point in order to minimise losses) so that those stop losses are triggered causing a lot more liquidity where the banks can buy without hiking up the price.
I have no idea if that is what is actually happening in the crypto market, simply spreading the knowledge as it sounds logical.
A Bitcoin (BTC) hypothetical. I've noticed over the last few weeks that BTC will drop and then it will hover around that new low for a while (1-3 days) then it will drop again. If traders put a stop loss into their books at say GDAX just under that new support level all the market manipulators have to do is push the value down just under the support level to trigger the stop losses and all of a sudden the market is flooded with stop loss trades (good buys).
Yep, this guy does a better job than I of explaining it! :)