A feature of SAAS for managing and validating cryptocurrency transactions using block chain-based smart contracts; application service provider featuring application programming interface (API) software for financial platform that facilitates confidential payment transactions over a computer network; Application programming interface (API) software for development, testing, and integration of blockchain software applications to shared and/or distributed ledgers; Application programming interface (API) software for creating and operating decentralized applications that rely on cryptographic methods for securing and processing communication, storage, and confidential computation services