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Providing temporary use of on-line non-downloadable software for accessing, reading, and tracking information in the field of downloadable digital files featuring art images, photographs, video clips, music, digital wearables and digital skins for use in virtual worlds and video games, digital trading cards, and social media posts, on a blockchain; providing online, non-downloadable computer software for use in browsing a database of downloadable digital files featuring art images, photographs, video clips, music, digital wearables and digital skins for use in virtual worlds and video games, digital trading cards, and social media posts, all of the foregoing authenticated by non-fungible tokens; providing online non-downloadable computer software for use in social networking