The near real-time control of 6 G network services requires decision-making to be placed as close to network devices as possible. A possible solution is to deploy a distributed system with intelligent agents that relieves the classical centralized control plane from such near-real-time control loops. However, distributing decision-making entails new vulnerabilities that attackers can exploit. This demonstration will showcase the solution devised by the DESIRE6G project to secure such distributed intelligence, which includes secure communications, as well as remote attestation to verify agents' integrity, both supported by immutable transactions based on a blockchain system.