Blockchain-Based IOT Security Architecture for Secure, Scalable, and Trustworthy Next-Generation Internet of Things Ecosystems

Abstract

ABSTRACT The rapid growth of the Internet of Things (IoT) has enabled billions of interconnected devices to exchange data across smart cities, healthcare systems, industrial automation platforms, and intelligent transportation networks. Despite its transformative potential, IoT environments remain highly vulnerable to cyberattacks due to limited device resources, centralized architectures, weak authentication mechanisms, and insecure communication channels. Traditional security frameworks often struggle to provide scalable trust management and tamper-resistant data protection in large-scale IoT deployments. This paper proposes a Blockchain-Based IoT Security Architecture that integrates distributed ledger technology, smart contracts, edge computing, and zero-trust authentication mechanisms to enhance security, privacy, and system reliability. The proposed framework enables decentralized device authentication, immutable transaction recording, secure data sharing, and automated access control through blockchain networks. Smart contracts dynamically enforce security policies and verify device identities before granting network access. Experimental evaluation demonstrates improvements in attack resistance, data integrity, authentication efficiency, and network trustworthiness compared with conventional centralized security approaches. The proposed architecture provides a scalable and resilient security solution for next-generation IoT ecosystems. Keywords: Blockchain, Internet of Things, Cybersecurity, Smart Contracts, Zero-Trust Architecture, Edge Computing, Distributed Ledger Technology, IoT Authentication.