Computer application software to secure and store digital currencies, to validate activity within digital wallets, and to conduct transactions or trades in blockchains; computer and mobile device, namely, a USB flash drive and software for accessing, initiating, validating and recording financial transactions; computer and mobile device application software for digitally recording transactions; computer and mobile device application software for providing authentication of a party to a financial transaction; computer and mobile device application software for maintaining ledgers for financial transactions; computer and mobile device application software for providing access control to accounts and assets involved in financial transactions; computer and mobile device application software for the management of cryptographic security of electronic transmissions across computer networks; computer and mobile device application software for automating processes for authentication of party identity in connection with the issuance and management of cryptographic keys used for authentication or encryption of digital communications in an electronic transaction or communication over the Internet and other computer networks; computer software, namely, encryption software to enable secure transmission of digital information over the Internet, as well as over other modes of communication between computing devices; computer and mobile device application software for authentication and identity management information security