Design, development and implementation of software in the field of blockchains; Design, development and implementation of software in the field of cryptocurrency; Computer programming services for mining of digital currency, digital coins, and cryptocurrency; Providing temporary use of non-downloadable decentralized applications (DApps) for cryptocurrency; Software as a service (SAAS) services featuring user authentication software using blockchain-based software technology for cryptocurrency and related transactions; Software as a service (SAAS) services featuring user authentication software for cryptocurrency and related transactions; Providing temporary use of non-downloadable software for managing cryptocurrency transactions using blockchain technology; Providing temporary use of non-downloadable software for managing cryptocurrency transactions; Providing temporary use of non-downloadable software for use as a digital wallet; Providing temporary use of non-downloadable software for use as a blockchain-based digital wallet; Providing temporary use of non-downloadable software for use as a cryptocurrency wallet; Providing temporary use of non-downloadable software for use in electronically trading, storing, sending, receiving, accepting and transmitting digital and physical currency, and managing digital and physical currency payment and exchange transactions; Providing temporary use of non-downloadable software for blockchain-based management of digital tokens; Providing temporary use of non-downloadable software for management of digital tokens; Providing temporary use of non-downloadable software for facilitating financial transactions; Providing temporary use of non-downloadable software for facilitating financial transactions using blockchain technology; Providing temporary use of non-downloadable software for facilitating cryptocurrency trading and exchange; Providing temporary use of non-downloadable software for facilitating cryptocurrency trading and exchange using blockchain technology; Providing temporary use of non-downloadable software for managing electronic asset exchange transactions; Providing temporary use of non-downloadable software for managing electronic asset exchange transactions using blockchain technology; Providing temporary use of non-downloadable software for managing and validating electronic asset exchange transactions; Providing temporary use of non-downloadable software for managing and validating electronic asset exchange transactions using blockchain-based smart contracts; Providing temporary use of non-downloadable software for managing and verifying cryptocurrency transactions on a blockchain; Providing temporary use of non-downloadable software for managing and verifying cryptocurrency transactions; Providing temporary use of non-downloadable software for generating cryptographic keys for receiving and spending cryptocurrency; Providing temporary use of non-downloadable software for generating cryptographic keys for receiving and spending cryptocurrency on a blockchain; Providing temporary use of non-downloadable software for processing electronic payments; Providing temporary use of non-downloadable software for processing electronic payments by cryptocurrency