42 Providing temporary use of online non-downloadable website and multimedia platform hosting digital 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 images, music and sound files, and video files, authenticated by non-fungible tokens (NFTs); Providing services in the nature of design of artwork to be authenticated by non-fungible tokens (NFTs); 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