MARTY UNDERCOVER Back to the Future BTTF Funko Pop Grail Digital NFT Redemption Presale. Digital NFT Redemption Token. All sales are final. The redemption period will begin on February 14, 2024 at 11:00AM PT and end on March 15, 2024 at 11:59PM PT. See second picture for important dates. Asset Name: Marty Undercover. This is a Digital NFT Redemption Token. You must have a Droppp account in order to receive and redeem this for the physical Pop. I respond to all questions within 24 hours. Visit droppp. Io/faq for more information.