Elon Musk has revealed that SpaceX has invested its cash reserves in bitcoin, following on from Tesla’s announcement earlier this year that it bought $1.5 billion of the cryptocurrency. ‘If the price of bitcoin goes down, I lose money,’ tech billionaire says. ‘I might pump but I don’t dump’ Speaking at The ₿ Word conference on Wednesday alongside Twitter CEO Jack Dorsey, Mr Musk also revealed that he personally owns a “significant” amount of bitcoin, as well as a smaller amount of Ethereum (ether) and dogecoin.