The growing dependence on wireless networks for vital applications has highlighted safety threats such as black hole assaults, which disrupt data flow and threaten the integrity of the network. This paper designs an augmentation of the AODV (Ad hoc On-Demand Distance Vector) protocol integrated with blockchain technology to reduce the influence of black hole attacks in mobile ad hoc networks (MANETs). By means of block chain technology, the proposed protocol ensures a decentralized and indelible way to validate routing information and locate malicious nodes. The technique consists of incorporating a thin block chain structure into the AODV protocol to transparently record route requests and responses to improve trust between network nodes. The simulation results indicate that the block chain-based AODV protocol significantly reduces packet loss and improve overall network performance compared to standard AODV. Analyzed results and investigations confirm that adding block chain technology to common routing protocols can ensure a scalable and efficient way to improve the MANET Security developments. i This work shows the promise block chain technology holds for changing how we secure decentralized wireless networks. The performance metrics of packet delivery ratio, throughput, and end-to-end delay are analyzed. The results demonstrate that the block chain-integrated AODV protocol significantly improves black hole attack detection and prevention while maintaining high data transmission reliability and overall network performance. This research aids in the development of secure and efficient routing solutions for network settings susceptible to hostile threats.