That's why I think this is a hack.. If there were no huge limit buy orders all the way down to 10ç I wouldn't have suspected foul play. But the fact that they existed, when no one would normally place such limit orders at such low prices in a market hovering around $320, means someone knew that such a thing could happen. I think the market maker who placed the multimillion sell order is the one who made majority of the purchases at low prices from various stops activated on the way down. And they probably kept buying until the trading was stopped.

The fact is that blockchain and cryptocurrency is all still at infancy stages, and it still is work in progress no matter how much they've done already. It still is very fragile. The DAO hack on Ethereum last year is just a case where technically no one did anything illegal, and the smart contract technically executed as it was supposed to. It was just that people didn't read the details of how it would work, and almost $60m were snapped!