Computer programming; development of computer platforms; software development [design]; installation, maintenance and updating or rental of software; gaming software development; software as a service [SaaS] for collecting registered non-fungible tokens on a blockchain network; providing temporary use of non-downloadable software for the exchange, purchase and sale of registered non-fungible tokens on a blockchain network; service for the storage of non-fungible tokens registered on a blockchain network; digital user authentication service; providing temporary use of on-line non-downloadable operating software for connecting to digital asset portfolios; electronic data storage; on-line data use services.