JASPER WARD, LUC COHEN and ANGUS BERWICK FTX founder Sam Bankman-Fried was arrested in the Bahamas at the behest of U.S. prosecutors, the day before he was due to testify before Congress about the abrupt failure last month of one of the world’s largest cryptocurrency exchanges. The arrest marks a stunning fall from grace for the 30-year-old entrepreneur widely known by his initials SBF, who rode a boom in bitcoin and other digital assets to become a billionaire many times over until FTX's rapid demise. The exchange, launched in 2019 and based in the Bahamas, filed for bankruptcy on November 11 after…