The hack of legal services provider Stretto Inc. resulted in the theft of customer information from Celsius Network LLC, which was broader than previously known and affected at least four companies in total. The attack affected creditors of Celsius, the failed cryptocurrency lender, and three other companies for which Stretto provided bankruptcy-related administrative services, a lawyer for Stretto said at a hearing in New York on Tuesday. The company said it learned on April 17 that it had been...