Downloadable multimedia image files containing artwork authenticated by non-fungible tokens (NFTs); downloadable multimedia file containing artwork featuring jewelry, home décor, watches, clocks, sunglasses, eyeglasses, cosmetics, fragrances, skin care preparations, nail care preparations, clothing, wallets, bags, and fashion accessories authenticated by non-fungible tokens (NFTs); Downloadable multimedia file containing artwork, text, audio, and video relating to jewelry authenticated by non-fungible tokens (NFTs); Downloadable virtual goods, namely, computer programs featuring jewelry, home décor, watches, clocks, sunglasses, eyeglasses, cosmetics, fragrances, skin care preparations, nail care preparations, clothing, wallets, bags, and fashion accessories for use online and in online virtual worlds; Downloadable computer software using block chain-based software technology and smart contracts for providing access to and transmission, recording ownership, use, storage, and purchase of digital collectibles and non-fungible tokens (NFTs)