if it will do it is good for btc. but i have no idea about it. i want to know more about this. it will be do something good. if it is good for trading i will invest here.

I think that is the issue here. How can we know who is doing this? Will BitMex share identification information of these people with law enforcement authorities ? I don't think so, because then BitMex will lose customers. This kind of market manipulation is nothing new it happens in traditional stock market but the fact that cryptocurrencies are decentralized and anonymous  it is very hard to pin point the bad guys and penalize them.

Let them dump, naivety in bitcoin is the cause of their panic dumping. They will bite their fingers when bitcoin start mooning.

Those signals can be considerable, but we cannot rely on them as on the firm thruth. The only thing that we can predict for sure as that bitcoin will be volatile, up and down cycling.

Hopefully nobody will ever dump Bitcoin. Many such attempts have come from the previous phase. But Bitcoin is in its own position. Looking forward to seeing what happens in the future.

I'm afraid this move was calculated. Might have been in relation with that sudden move of btc to 6900 on bitmex? Someone needed the bitcoin at the right place at the right time... What i dislike a bit is uncorrelated data, if that bitcoin was just a portion on the pie one had on another account or company, for bitmex long and short business, then we are looking at a mouse, and cat at the same time.

We cant control them whenever they want to sell some of there bags , Yes it could impact and manipulate the market price still its their game. Us tadpoles could only whine and see price falling after they dump their bags.

Let's see how the market will react. Because its structure is stronger and provides very good service. Time will tell. All this decline in the market will end once no worries and we will all get our long awaited again, lots of ideas to consume hypothetical ideas appear in the brain if you see something big is being sold in this market.

no need to worry about this, if indeed 18000 BTC is ready for sale, I will also definitely wait when the BTC price is cheap,
buyback, then wait for prices to recover and feel even greater profit
remember, that Bitcoin is a decentralized asset

It still has relevance, because it stands as proof that dumping of coins on an exchange does not necessarily guarantee a dumping of coins on the market and also that it gives us a opportunity to reflect on the outcome of this discussion, even if it is 2 month down the line.

A whale might deposit the coins and gradually start selling the coins in small quantities without having any significant impact on the price. Yes, it might not be that evident on the price, but it still have a minor impact over a longer period. <Price stagnation>