Recent rapid advancements in communication technology have brought forth the era of Web 3.0, representing a substantial transformation in the Internet landscape. This shift has led to the emergence of various decentralized metaverse applications that leverage blockchain as their underlying technology to enable users to exchange value directly from point to point. However, blockchains are blind to the real world, and smart contracts cannot directly access data from the external world. To address this limitation, the technology of oracles has been introduced to provide real-world data for smart contracts and other blockchain applications. In this paper, we focus on mitigating the risks associated with oracles providing corrupt or incorrect data. We propose a novel Web 3.0 architecture for the Metaverse based on the multi-identifier network (MIN), and its decentralized blockchain oracle model called MetaOracle. The experimental results show that the proposed scheme can achieve minor time investment in return for significantly more reliable data and increased throughput.

In architecture of cloud storage, the deduplication technology encrypted with the convergent key is one of the important data compression technologies, which effectively improves the utilization of space and bandwidth. To further refine the usage scenarios for various user permissions and enhance user’s data security, we propose a blockchain-based differential authorized deduplication system. The proposed system optimizes the traditional Proof of Vote (PoV) consensus algorithm and simplifies the existing differential authorization process to realize credible management and dynamic update of authority. Based on the decentralized property of blockchain, we overcome the centralized single point fault problem of traditional differentially authorized deduplication system. Besides, the operations of legitimate users are recorded in blocks to ensure the traceability of behaviors.