According to a new post on Monday, Starbucks says it will offer its U.S. members the ability to earn and buy digital collectible stamps in the form of nonfungible tokens, or NFTs. Dubbed "Starbucks Odyssey," each collectible digital stamp has its ownership verified on the blockchain and will include a point value based on its rarity. As more stamps are collected, members' points will increase, unlocking access to unique experiences.