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Development of software for exchange of virtual currencies; development of software for virtual currency transactions; development of software for issuance of virtual currencies; development of computer game software; design and development of blockchain database networks; technical support, namely, monitoring technological functions of computer network systems; development of software for security network management; design and development of blockchain network; development of blockchain-based application software; development of software for management of blockchain-based virtual currency network; development of software for blockchain-based systems; maintenance of software for blockchain networks; computer software development, computer programming and maintenance of computer software in the field of blockchain database networks; computer programming services for electronic commerce transactions; maintenance of computer software for electronic commerce transactions; development of software for electronic wallets; providing security services for computer networks, computer access, and computerized transactions; advisory services in the field of computing networks; development of computer software for token transactions; development of software for issuance of tokens