<p>Recently, leveraging cloud storage as a digital content-sharing platform has gained significant popularity. However, given the sensitive and valuable nature of digital content, strict identity verification and ensuring the integrity of cloud-stored digital content are crucial. To address these challenges, this paper introduces a public auditing scheme to support efficient data sharing in the cloud. Firstly, a consortium blockchain with stringent identity restrictions on nodes is integrated into the scheme’s model architecture. Serving as a trusted network that links users, it significantly eliminates the necessity for repeated identity verification and authorization processes before data access, thereby enhancing access efficiency. The proposal explores two typical application scenarios: partial data sharing and full data sharing, and subsequently designs a sharing mechanism based on proxy re-encryption to cater to diverse data sharing requirements among different users. Moreover, our scheme improves data integrity verification by supporting both single file and batch auditing, with detailed procedures provided for each. Security analysis demonstrates that our scheme meets requirements for both correctness and soundness. A series of comparative experiments further validate the feasibility and efficiency of our proposal.</p>