Decentralized Data Subscription System: A Multi-Chain Blockchain and IPFS Integration

In the traditional data exchange and subscription paradigm, numerous challenges arise, including centralized management, deficiencies in data sharing efficiency, inadequacies in data query performance, and data security risks. This paper introduces a subscription framework based on multi-chain blockchain technology. The framework establishes a decentralized system that facilitates data service subscriptions, utilizing the InterPlanetary File System (IPFS) for off-chain service data storage. This strategy significantly reduces the on-chain data volume and enhances the off-chain data security. Furthermore, the system integrates a hash-based data query method, which improves the efficiency of data retrieval, particularly for frequent queries. To bolster the system's security, an identity-based access control mechanism has been crafted to reinforce the security system and safeguard data privacy. The blockchain-enhanced data subscription system significantly outperforms traditional models in terms of data sharing and query efficiency, while also enhancing the security and reliability of the system.