Bitcoin may be taking another step toward mainstream adoption - for the first time, customers of some U.S. banks will soon be able to buy, hold and sell bitcoin through their existing accounts thanks to portfolio company NYDIG. The company has partnered with fintech giant Fidelity National Information Services to enable U.S. banks to offer bitcoin in coming months, and hundreds are already enrolled in the program. Additionally, after rolling out the initial bitcoin product, NYDIG plans on other services, including debit card rewards paid in bitcoin and a new type of bank account that is FDIC insured, but pays interest in bitcoin.