Authentication of data for financial transactions using blockchain technology; software-as-a-service [SaaS] featuring cryptocurrency trading software; providing an interactive website featuring technology that enables users to trade cryptocurrencies; non-downloadable online computer software for managing and verifying cryptocurrency transactions using blockchain technology; non-downloadable online computer software for managing and verifying cryptocurrency transactions using blockchain-based smart contracts; non-downloadable online computer software for managing and verifying cryptocurrency transactions on a blockchain; providing temporary use of non-downloadable online computer software for use in e-commerce, storing, sending, receiving, receiving and transferring digital currency and in managing digital currency payments and exchange transactions; providing temporary use of non-downloadable online computer software for processing online financial transactions and payments; providing temporary use of non-downloadable online computer software for the purchase, sale, trading, settlement, clearing, custody, storage and management of digital tokens and digital currencies; providing temporary use of non-downloadable online computer software for conducting electronic commerce transactions using self-executing digital contracts; providing temporary use of non-downloadable online computer software for creating, maintaining and managing a digital wallet [e-wallet].;