How to lose all bitcoins at once where only you can control your bitcoins. Bitcoin is completely decentralized so no one can control it. You can control as much as you bought or mined and own as much as you own. So I don't see any chance that all bitcoins can be lost at once. If you ask such questions knowing all this, then you are the biggest fool. People trust Bitcoin so much and invest in Bitcoins with confidence because there is no such thing as a Bitcoin Scam or all the Bitcoins disappearing all at once.