Industrial Internet of Things (IIoT) plays an indispensablerole for Industry 4.0, people are committed toimplementing a general, scalable and secure IIoT system to beadopted across various industries. However, existing IIoT systemsare vulnerable to single point of failure and malicious attacks,which cannot provide stable services. Due to the resilience andsecurity promise of blockchain, the idea of combining blockchainand IoT gains considerable interest. However, blockchains arepower-intensive and low-throughput, which are not suitablefor power-constrained IoT devices. To tackle these challenges,we present a blockchain system with credit-based consensusmechanism for IIoT. We propose a credit-based proof-of-work(PoW) mechanism for IoT devices, which can guarantee systemsecurity and transaction efficiency simultaneously. In order toprotect sensitive data confidentiality, we design a data authoritymanagement method to regulate the access to sensor data. Inaddition, our system is built based on directed acyclic graph(DAG)-structured blockchains, which is more efficient than thesatoshi-style blockchain in performance. We implement thesystem on Raspberry Pi, and conduct a case study for the smartfactory. Extensive evaluation and analysis results demonstratethat credit-based PoW mechanism and data access control aresecure and efficient in IIoT.
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