A frame of black-and-white movie footage from 1947, known as the Alien Autopsy film, is being auctioned as a non-fungible token (NFT). The negative depicts an autopsy, which many believe is of an extra-terrestrial that crash-landed in New Mexico's Roswell in August 1947, Rarible said. The minimum bid of the 16mm frame has been fixed at over $1 million.