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6G is envisioned to enable futuristic technologies, which exhibit morecomplexities than the previous generations, as it aims to bring connectivity toa large number of devices, many of which may not be trustworthy. Properauthentication can protect the network from unauthorized adversaries. However,it cannot guarantee in situ reliability and trustworthiness of authorizednetwork nodes, as they can be compromised post-authentication and impede thereliability and resilience of the network. Trust and Reputation Management(TRM) is an effective approach to continuously evaluate the trustworthiness ofeach participant by collecting and processing evidence of their interactionswith other nodes and the infrastructure. In this article, we argue thatblockchain-based TRM is critical to build trustworthy 6G networks, whereblockchain acts as a decentralized platform for collaboratively managing andprocessing interaction evidence with the end goal of quantifying trust. Wepresent a case study of resource management in 6G networks, whereblockchain-based TRM quantifies and maintains reputation scores by evaluatingfulfillment of resource owner's obligations and facilitating resource consumersto provide feedback. We also discuss inherent challenges and future directionsfor the development of blockchain-based TRM for next-generation 6G networks.

Towards Blockchain-based Trust and Reputation Management for Trustworthy 6G Networks