Compiling indexes of information using blockchain technology; Conducting virtual trade show exhibitions online in the field of art; Conducting virtual trade show exhibitions online in the field of digital collectibles; Inventory management; Inventory management in the field of non-fungible tokens (NFTs); Operating on-line marketplaces featuring non-fungible tokens (NFTs); Operating on-line marketplaces for sellers and buyers of goods and/or services; Providing a website featuring an online marketplace for exchanging goods and services with other users; Providing a website for users with specific informed recommendations of specific consumer products and services validated by the users' inputted preferences and social network; Provision of an on-line marketplace for buyers and sellers of non-fungible tokens (NFTs); Provision of an on-line marketplace for buyers and sellers of goods and services; Provision of an online marketplace for buyers and sellers of goods and services