Downloadable artwork files, music files, and video files authenticated by non-fungible tokens (NFTs); downloadable multimedia files containing artwork in the field of entertainment authenticated by non-fungible tokens; downloadable software for receiving and accessing non-fungible tokens; Downloadable image and multimedia files containing artwork in the field of entertainment authenticated by non-fungible tokens used with blockchain technology; downloadable digital art images featuring digital animated and non-animated designs and characters, avatars, digital overlays and skins for access and use in online environments, virtual online environments, and extended reality virtual environments