42 Providing temporary use of online non-downloadable website software for hosting an online marketplace for buyers and sellers of digital art images, music and sound files, and video files, authenticated by non-fungible tokens (NFTs); platform as a service (PAAS) featuring computer software platforms for creating, promoting, selling, and exchanging digital art images, music and sound files, and video files, authenticated by non-fungible tokens (NFTs); Providing temporary use of on-line non-downloadable computer software for use as a digital wallet; Providing temporary use of on-line non-downloadable computer software for enabling users to electronically create, exchange, store, send, receive, accept, transmit, and display digital art images, music and sound files, and video files, authenticated by non-fungible tokens (NFTs) using blockchain technology; Providing services in the nature of design of artwork to be authenticated by non-fungible tokens (NFTs) using blockchain technology; Providing custom design services of digital art images, music and sound files, and video files to be authenticated by non-fungible tokens (NFTs) based on personal selections made by the customer; Application service provider (ASP) featuring e-commerce software for use as a payment gateway that authorizes processing of credit cards or direct payments for merchants in connection with sales of digital art images, music and sound files, and video files, authenticated by non-fungible tokens (NFTs)