<h4>Quick Take</h4> <ul> <li>The U.S. Office of the Comptroller of the Currency has opened the door for banks under its regulatory remit to offer crypto custody services.</li> <li>Industry startups cheered the move and pointed to potential business opportunities for the sector.</li> <li>Experts say the real beneficiaries will be small and medium banks — big banks not so much.</li> </ul>