Nope. All chains are corruptible. Nothing should ever be based on the idea that some core group of people is above reproach. That is the stuff of superhero movies. Realworld trust systems must be built on the basis that everyone and anyone might be a bad actor. All nodes should have oversight. All actors should be accountable to multiple levels of supervision. Everything should be documented. Those who become corrupt need to be detected and removed. When dealing with classified information the process will operate more slowly but must still take place.