ZURICH: Roughly three-quarters of people who have bought bitcoin have lost money according to a study published Monday as the cryptocurrency sector reels from the collapse of a major exchange that has sapped confidence. Economists at the Bank of International Settlements, an institution widely considered as the central banks of central banks, analysed data on investors in cryptocurrencies in 95 countries between 2015 and 2022. “Overall, back of the envelope calculations suggest that around three-quarters of users have lost money on their bitcoin investments,” they said in their study. During t…