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Access control is a policy in data security that controls access to resources. The current access control mechanisms are facing many problems, due to the interference of the third-party, privacy, and security of data. These problems can be addressed by blockchain, the technology that gained major attention in recent years and has many capabilities. However, in the blockchain network, every peer maintains the same state of the ledger to view the complete history of transactions that leads to scalability issues in the blockchain network. To address the problem of scalability we propose an enhanced Bell–LaPadula model and categorized the peers and transactions in different clearance and security levels. The peers don’t have to maintain the complete history of transactions owing to the clearance level. To provide data security in the network we constructed a dynamic access control policies using a smart …