There are many news about the ETFs proposals that are being discussed by the US SEC. The creation of these will have a strong influence in Bitcoin and many people said that the futures over bitcoin could potentially tame Bitcoin and ETFs may have an even stronger effect.

For me is easier to understand if I use a football comparison: Let´s say that I bet 4 million on a game, so if the Red Team wins, I will make 4 millions of profit. The manipulation could occur if buying the referee and perhaps a few key players only costs 1 million. So:

- I bet 4 million.
- I spend 1 million in bribes.
- I get 8 million once I win.

With bitcoin or other coins you don´t have to bribe, you just buy and rise the price or sell if you need it to be low and then you make your profit with the leverage of the derivatives. e.g. Raising the price of bitcoin on a certain day would cost 1 million. If you used leveraged derivatives you will get x5 the increase and that can be more than the million you´d put in.

There is a long article here about the topic, and some historical references here and here. The references date back to BC.

"Jumping forward to Mesopotamia in the late 1700s B.C., trade and commodity security became dictated by rulers’ codes, which functioned as some of the first recorded contracts. Like those by Hammurabi of Babylon, "