If the people who downvoted me thought that I was being disparaging with my comment of "we don't know how to do it", let me clarify that this was not my intent.

If the people who downvoted me thought that I was being disparaging with my comment of "we don't know how to do it", let me clarify that this was not my intent. What I meant was that there are genuine difficulties in trying to decentralise trust, and I don't think anyone knows how to solve them all right now. For example, we could store transparency data in a blockchain, which might have independent economic incentives to keep it operating beyond the life span of any individual log provider (and without an individual log provider being able to rewrite history), but how does a piece of software check a value on a blockchain without receiving that piece of information from a trusted intermediary (or better a configurable list of mutually-independent semi-trusted intermediaries)?