A survey of cyber attacks on blockchain based IoT systems for industry 4.0

The industry 4.0 revolution leads by technologies such as distributed digital ledgers, big data processing techniques, automation, and the internet of things (IoT). The interest in the industrial internet of things (IIoT) has progressed rapidly with huge internet areas such as research, academics, and industries. Through a decentralised and distributed approach blockchain and IIoT ensure maximum security. In the distributed approach, every block is chained together with each other. This paper presented a survey on industry 4.0 and blockchain-based systems. The integration of blockchain, IoT devices, and industry 4.0 provides security, transparency, and scalability to the system. The paper also addresses many types of cyber attacks and possible solutions for blockchain based industrial internet of things (BIIoT) systems.