Compiling indexes of information using blockchain technology and smart contracts; Provision of an online marketplace for buyers and sellers of downloadable digital art images authenticated by non-fungible tokens (NFTs); Providing digital collectible services, namely, operating an online marketplace for buyers and sellers of goods and services using blockchain-based software technology and smart contracts featuring digital collectibles; Providing digital collectable services, namely, maintaining a registry of digital collectibles using blockchain-based software technology and smart contracts; Providing non-fungible tokens, namely, provision of an online marketplace for buyers and sellers of downloadable digital artwork authenticated by non-fungible tokens (NFTs); Auctioning of non-fungible cryptographic tokens; conducting of Internet auctions; auctioning via telecommunication networks; auction services featuring non-fungible cryptographic tokens