42 Software, in the form of non-downloadable web-based decentralized applications (DApps), for facilitating transactions of cryptocurrencies, digital currencies, virtual currencies, digital tokens, digital assets, cryptoassets, cryptographic assets, and stablecoins, and for managing portfolios of cryptocurrencies, digital currencies, virtual currencies, digital tokens, digital assets, cryptoassets, cryptographic assets, and stablecoins; Implementation of application programming interface (API) software for facilitating transactions of cryptocurrencies, digital currencies, virtual currencies, digital tokens, digital assets, cryptoassets, cryptographic assets, and stablecoins; Software, in the form of non-downloadable web-based decentralized applications (DApps), for remote network-based management of cryptocurrencies, digital currencies, virtual currencies, digital tokens, digital assets, cryptoassets, cryptographic assets, and stablecoins; Software, in the form of non-downloadable web-based decentralized applications (DApps), for facilitating the use of a blockchain or distributed ledger to execute and record financial transactions in connection with the use of cryptocurrencies; Software, in the form of non-downloadable web-based decentralized applications (DApps), for facilitating access to an online platform for cryptocurrencies, digital currencies, virtual currencies, digital tokens, digital assets, cryptoassets, cryptographic assets, and stablecoins; Software, in the form of non-downloadable web-based decentralized applications (DApps), for facilitating digital currency transaction software for transactions involving cryptocurrencies, digital currencies, virtual currencies, digital tokens, digital assets, cryptoassets, cryptographic assets, and stablecoins; Software, in the form of non-downloadable web-based decentralized applications (DApps), for facilitating secure transactions via computer and communication networks, in the field of transactions in cryptocurrencies, digital currencies, virtual currencies, digital tokens, digital assets, cryptoassets, and cryptographic assets, and stablecoins; Software, in the form of non-downloadable web-based decentralized applications (DApps), for conducting transactions involving cryptocurrencies, digital currencies, virtual currencies, digital tokens, digital assets, cryptoassets, cryptographic assets, and stablecoins; Software, in the form of non-downloadable web-based decentralized applications (DApps), for facilitating transactions and managing portfolios of cryptocurrencies, digital currencies, virtual currencies, digital tokens, digital assets, cryptoassets, and cryptographic assets, and stablecoins; Providing a secure, web-based service featuring technology that enables an open-source protocol on a blockchain-based network; Providing a secure, web-based service featuring technology that enables a user interface for transacting with cryptographic smart contracts operating through the Internet