Providing on-line non-downloadable software for blockchain-based platforms for developing and building distributed software applications, protocols and decentralized applications (dApps); Computer programming of smart contracts on a blockchain; Providing online, non-downloadable software for buying, selling, sending, receiving, exchanging, and transacting cryptocurrency, digital currency, virtual currency, blockchain enabled currency, and related assets; Providing online, non-downloadable software to enable transactions in cryptocurrency, digital currency, virtual currency, blockchain enabled currency, and related assets using blockchain, smart contracts, and related technologies; Design, development, and implementation of software for blockchain software; Developing customized software in the field of blockchain software for others; Software development and product development consulting in the field of blockchain software; Providing on-line non-downloadable software for developing, building, and operating distributed applications and for managing and verifying cryptocurrency transactions via a blockchain; Providing on-line non-downloadable software for blockchain development and implementation; Providing online non-downloadable software for managing and validating cryptocurrency transactions using blockchain-based smart contracts