Introduction  Blockchain technology has revolutionized decentralized data governance by enabling immutable, transparent, and audit-friendly access control. Among various access control paradigms, Attribute-Based Access Control (ABAC) offers dynamic, fine-grained control by evaluating diverse user, resource, and environmental attributes to govern permissions. When integrated with blockchain, ABAC promises secure decentralized enforcement of access policies without reliance on centralized authorities.  However, this integration faces two critical challenges. First, blockchain’s inherent transparency through distributed ledgers heightens privacy risks. User attributes stored or processed on-chain can be analyzed to re-identify individuals, enabling inference or profiling attacks that undermine user anonymity. Second, the computational demands of…

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