Computer software platforms for for use in digital asset exchange transactions, privacy management and security; Computer hardware, software and firmware for authenticating transactions and user identification, privacy management and security; Downloadable computer software, namely, software in the fields of digital security and database access management for use in validating transactions and user identity and security; Decentralized digital identities, privacy and security; Computer software for transaction integrity, digital identities, digital identity certificates, and decentralized digital identities; Cryptocurrency, securities tokens, utility tokens; Computer software platforms for facilitating underwriting of financial products for blockchain transactions and management of distributed ledgers; Downloadable computer software for use in electronically trading, storing, sending, receiving, accepting and transmitting digital currency, securities, tokens and managing digital currency security and token payment and exchange transactions