In a letter to its customers, cryptocurrency exchange QuadrigaCX states its efforts to locate the exchange's cold wallets have failed. The exchange has been reeling since the death of its CEO and founder in December 2018 and a prolonged court dispute with the Imperial Bank of Canada over frozen assets. Yesterday, Jan. 31, 2019, QuadrigaCX filed for creditor protection with the Nova Scotia Supreme Court and has asked for a third party monitor to oversee proceedings.