This article presents a novel approach to enhancing the security of Industrial IoT (IIoT) networks by integrating blockchain technology. The proposed system addresses the growing security challenges in IIoT, where traditional methods often fail to adequately protect data integrity, confidentiality, and access control. The system leverages blockchain to ensure secure, tamper-proof data transmission and storage, utilizing a private blockchain gateway to process and classify data based on confidentiality levels. Data are compressed, encrypted using ChaCha20-Poly1305, and transmitted to local aggregators, which then send encrypted data to distributed nodes for verification. The system employs Zero Knowledge Proof (ZKP) for device authorization, ensuring secure and efficient data retrieval while maintaining a balance between security and accessibility. The private blockchain gateway classifies data into "less confidential" and "confidential" categories, storing the latter in the Interplanetary File System (IPFS) for enhanced security. The system also uses Proof of Authority (PoA) consensus to validate data, ensuring authenticity and trustworthiness. The architecture is divided into four phases: data acquisition and processing, blockchain gateway processing, consensus mechanism, and IoT device access. The system aims to improve the security, efficiency, and scalability of IIoT networks by integrating advanced cryptographic techniques and blockchain-based data management. The research contributes to the broader effort of advancing IoT security and operational efficiency, emphasizing the need for continuous innovation in this dynamic field.This article presents a novel approach to enhancing the security of Industrial IoT (IIoT) networks by integrating blockchain technology. The proposed system addresses the growing security challenges in IIoT, where traditional methods often fail to adequately protect data integrity, confidentiality, and access control. The system leverages blockchain to ensure secure, tamper-proof data transmission and storage, utilizing a private blockchain gateway to process and classify data based on confidentiality levels. Data are compressed, encrypted using ChaCha20-Poly1305, and transmitted to local aggregators, which then send encrypted data to distributed nodes for verification. The system employs Zero Knowledge Proof (ZKP) for device authorization, ensuring secure and efficient data retrieval while maintaining a balance between security and accessibility. The private blockchain gateway classifies data into "less confidential" and "confidential" categories, storing the latter in the Interplanetary File System (IPFS) for enhanced security. The system also uses Proof of Authority (PoA) consensus to validate data, ensuring authenticity and trustworthiness. The architecture is divided into four phases: data acquisition and processing, blockchain gateway processing, consensus mechanism, and IoT device access. The system aims to improve the security, efficiency, and scalability of IIoT networks by integrating advanced cryptographic techniques and blockchain-based data management. The research contributes to the broader effort of advancing IoT security and operational efficiency, emphasizing the need for continuous innovation in this dynamic field.