42 Authentication of data in the field of cryptocurrency trading, cloud storage of data, web browsing, and digital media content, including music using blockchain technology; Computer services, namely, digital formatting and compression of music and video images into downloadable media; Design, development, and implementation of software for tax calculation and collection, computer services, namely, integration of computer software into multiple systems and networks; Peer-to-browser photo sharing services, namely, providing a website featuring technology enabling users to upload, view, and download digital photos; Platform as a service (PAAS) featuring computer software platforms for database management; Providing a web site featuring temporary use of non-downloadable software allowing web site users to upload, post and display online videos for sharing with others for entertainment purposes; Providing on-line non-downloadable computer software for use as a cryptocurrency wallet; Providing on-line non-downloadable software for generating cryptographic keys for receiving and spending cryptocurrency; Providing temporary use of non-downloadable computer software for preparing invoices over computer networks, intranets and the internet; Providing temporary use of non-downloadable web-based decentralized applications (DApps) for management and deployment of multiple credit and debit card readers; Providing temporary use of on-line non-downloadable software for managing, reporting, and reconciling payment transactions made online and offline; providing temporary use of non-downloadable software for configuring mobile and web applications to accept in-store payments; Providing temporary use of on-line non-downloadable software for allowing third party sellers to accept in-person payments for purchases; providing temporary use of non-downloadable software for management of sales made online and offline and making payouts on such sales; Providing temporary use of on-line non-downloadable software for for allowing third party sellers to accept in-person payments for purchases; Providing temporary use of on-line non-downloadable software for management of sales made online and offline and making payouts on such sales; Providing temporary use of on-line non-downloadable software for management and deployment of multiple credit and debit card readers; Providing temporary use of on-line non-downloadable software for use as an electronic wallet; Providing temporary use of on-line non-downloadable software for for providing an electronic platform that facilitates development and usage of Blockchain software applications; Providing temporary use of on-line non-downloadable software for use with blockchain and distributed ledger technology and decentralized databases for uploading, downloading, playing, streaming, storing, sharing, broadcasting, distributing, transmitting, receiving, encoding, decoding, reproducing, licensing, exploiting, monetizing, and accounting for and collecting royalties and revenues for audio, audiovisual, and multimedia recordings and digital entertainment content, including music, by artists, musicians, creators, and other intellectual property and copyright owners and licensors; Software as a service (SAAS) services featuring software for for providing an electronic platform that facilitates development and usage of Blockchain software applications; Software as a service (SAAS) services featuring software for use with blockchain and distributed ledger technology and decentralized databases for uploading, downloading, playing, streaming, storing, sharing, broadcasting, distributing, transmitting, receiving, encoding, decoding, reproducing, licensing, exploiting, monetizing, and accounting for and collecting royalties and revenues for audio, audiovisual, and multimedia recordings and digital entertainment content, including music, by artists, musicians, creators, and other intellectual property and copyright owners and licensors