The QuadrigaCX cryptocurrency exchange says it can't access some $190 million in bitcoin and other funds after its founder and CEO, Gerald Cotten, died at age 30 — without sharing the password for his encrypted laptop. Cotten was "the sole officer and director" of the Canadian cryptocurrency exchange when he died, said his widow, Jennifer Robertson, in an affidavit that is part of the company's request for court assistance as it seeks protection from its creditors. The debt filing comes weeks after Robertson announced that Cotten had died — an event she described as "a shock to all of us."...