Platform as a service (PAAS) featuring computer software platforms for deploying and managing decentralized applications (dApps); executing smart contracts; interacting with blockchain networks; managing on-chain data; and developer tools and APIs for blockchain software development; Providing online, non-downloadable software for building, testing, and operating blockchain-based applications; issuing and transferring digital assets and tokens; and on-chain data indexing and retrieval using blockchain technology; Providing online, non-downloadable application programming interface (API) software for collecting, verifying, and transmitting information via a blockchain data feed to smart contracts