Insiders from cryptocurrency exchange FTX (CRYPTO: FTT) have revealed a concealed mechanism linked to Alameda Research that allowed unauthorized withdrawal of billions in customer funds. The issue was reported to the company's higher-ups but no action was taken. The 'backdoor' is now a focal point in the ongoing trial against FTX's former head, Sam Bankman-Fried, who faces charges of fraud in a New York federal court. The discrepancy was first noticed by a team from LedgerX, a U.S. crypto-derivatives exchange acquired by FTX.