Jamie Dimon plans to step down as JPMorgan CEO in three years, staying as chairman. The succession could reshape the bank's blockchain and crypto strategy.

Dimon, who turned 70 in March, has been JPMorgan's boss for two decades, steering it through the financial crisis.

JPMorgan Chase promotes Doug Petno and Troy Rohrbaugh to copresidents, positioning them as potential successors to the bank's longtime CEO Jamie Dimon.