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The Rapid Advancement Of Blockchain Technology Has Enabled Secure And Transparent Data Storage Across Decentralized Networks. However, Effective Data Sharing Between Heterogeneous Blockchains Remains A Major Challenge Due To Differences In Governance, Security Models, And Access Control Policies. Attribute-Based Encryption (ABE) Has Emerged As A Promising Cryptographic Solution For Fine-grained Access Control, Yet Most Existing Schemes Rely On A Single Trusted Authority, Limiting Scalability, Flexibility, And Resistance To Authority Compromise. To Address These Limitations, This Study Proposes A Multi-Authority Attribute-Based Encryption (MA-ABE) Scheme With Access Delegation Tailored For Cross-blockchain Data Sharing. In The Proposed Framework, Multiple Independent Authorities Collaboratively Manage User Attributes, Thereby Eliminating Single Points Of Failure And Enhancing Trust Distribution. Furthermore, An Access Delegation Mechanism Is Integrated To Allow Secure Transfer Of Access Rights Among Authorized Entities Without Exposing Secret Keys, Thereby Enabling Flexible And Efficient Data Sharing Across Blockchain Platforms. The Scheme Ensures Confidentiality, Fine-grained Access Control, And Interoperability While Reducing Computational Overhead Through Optimized Key Generation And Decryption Processes. Security Analysis Demonstrates That The Proposed Scheme Resists Collusion Attacks, Unauthorized Access, And Authority Compromise, While Performance Evaluation Indicates Its Practicality In Real-world Cross-blockchain Applications Such As Supply Chain Management, Healthcare, And Financial Data Sharing.