Sam Bankman-Fried said he did not steal money and blamed the collapse of his now-bankrupt FTX exchange on a broad crash in cryptocurrency markets, in a highly unusual blog post on Thursday, a month after his arrest on U.S. fraud charges. Federal prosecutors in Manhattan in December said Bankman-Fried stole billions of dollars from FTX customers to pay debts for his crypto-focused hedge fund, Alameda Research, purchase lavish real estate, and donate to U.S. political campaigns.