I just want to know how those people behind bitcoin secure the money they will invest because as far as I know there are lots of hackers all over the world.
There is no safe in this crypto currency. So you're sure that your investment will be safe. All I can advise is to avoid phishing sites. Check carefully if the web site you are visiting is correct to ensure that it is not a phishing.
If our money is not safe then returned will not be double up like this when you have pain was too hard owner the loss of profits from there investment you are very short period but it needs time equally for a man to do something in his life.