*Result*: Special Issue on Security and Privacy in Blockchains and the IoT—3rd Edition.

*This article focuses on the security, privacy, and trust challenges arising from the convergence of blockchain technologies and the Internet of Things (IoT) in distributed systems. It presents a comprehensive overview of foundational vulnerabilities, threat detection mechanisms, and practical blockchain-based architectures across diverse domains such as healthcare, digital forensics, smart grids, and industrial IoT. The article highlights the complexity of securing heterogeneous, resource-constrained IoT environments integrated with blockchain’s decentralized protocols, emphasizing the need for holistic, trust-aware, and privacy-preserving solutions that address both technical and human factors. It also underscores emerging research directions including quantum-aware security, explainable AI, and regulatory compliance, advocating interdisciplinary collaboration to develop resilient and socially acceptable decentralized infrastructures. [Extracted from the article]*