The rapid expansion of the Industrial Internet of Things (IIoT) introduces significant security challenges due to the increasing number of interconnected devices and the vast amount of sensitive data exchanged across networks. Blockchain technology has emerged as a promising solution to enhance security, providing decentralized authentication, data integrity, and resistance to cyberattacks. However, the integration of blockchain in IIoT networks has been limited by latency, scalability, and energy consumption constraints associated with current communication technologies. The advent of sixth-generation (6G) wireless communication offers a transformative opportunity to optimize blockchain implementation in IIoT. With its ultra-low latency, high bandwidth, and AI-driven network management, 6G enables real-time blockchain transactions, ensuring secure and efficient data exchange in IIoT ecosystems. This paper explores the synergies between blockchain and 6G in enhancing IIoT security, analyzing key opportunities such as decentralized trust mechanisms, quantum-resistant cryptographic protocols, and intelligent network slicing by simulating IIoT devices acting in a blockchain P2P network. The proposed architecture is determined suitable for real-time, high-transmission environments due to its low execution time for block insertion. By leveraging 6G’s capabilities, blockchain-based IIoT networks can achieve unprecedented levels of security, reliability, and operational efficiency, paving the way for a resilient and future-proof industrial landscape.