Which of the following is not part of the foundational elements of blockchain but supports cloud-based applications that need access to documents, videos, and image files?

The foundational elements of blockchain technology primarily involve components that ensure the integrity, security, and trustworthiness of data within the decentralized network. Among the listed choices, object storage stands out as it is not inherently a feature of blockchain. Instead, it serves as a storage solution that allows cloud-based applications to efficiently manage and retrieve large amounts of unstructured data such as documents, videos, and image files.

Object storage systems are designed to store data as discrete units or objects and provide scalability, accessibility, and ease of integration with various applications. This makes them particularly useful for applications that require extensive data storage and retrieval capabilities, a function that is distinct from the roles played by distributed consensus, multiparty computation, and hashing, which are critical to maintaining the operational integrity and decentralized nature of a blockchain.

In summary, while distributed consensus ensures agreement on the state of the blockchain, multiparty computation allows collaborative processing of data in a secure manner, and hashing provides data integrity through unique cryptographic representations, object storage purely facilitates the storage and access of various types of files, thus not being a core element of blockchain technology itself.