42 Authentication and validation of data in the field of artwork authenticated by non-fungible tokens (NFTs) using blockchain technology; providing temporary use of online non-downloadable software for viewing and providing access to digital assets, digital tokens, crypto-tokens, utility tokens, non-fungible tokens (NFTs), digital collectibles, crypto-collectibles, cryptocurrencies, digital currencies and virtual currencies; providing temporary use of online non-downloadable software for distributing, trading, storing, sending, receiving, accepting, and transmitting digital assets, digital tokens, crypto-tokens, utility tokens, non-fungible tokens (NFTs), digital collectibles, crypto-collectibles, cryptocurrencies, digital currencies and virtual currencies; providing temporary use of online non-downloadable software for managing and validating transactions involving digital assets, digital tokens, crypto-tokens, utility tokens, non-fungible tokens (NFTs), digital collectibles, crypto-collectibles, cryptocurrencies, digital currencies and virtual currencies; providing temporary use of online non-downloadable electronic payment processing software; providing temporary use of online non-downloadable software for providing authentication of parties to a financial transaction; providing temporary use of online non-downloadable software for maintaining ledgers for financial transactions; providing temporary use of online non-downloadable software for the management of cryptographic security of electronic transmissions across computer networks; providing temporary use of online non-downloadable software for encrypting and enabling secure transmission of digital information over the Internet; providing temporary use of online non-downloadable software for currency conversion