I'm not sure I'm understanding this. Maybe I need a concrete example. I can see how financial data can be verified on a blockchain, but how would it work with media? It seems like it would be a bit trickier, because media is so often a mix of facts and opinions. Is there a blockchain out there that is already verifying facts and separating them from opinions somehow? What about "facts" that are subject to change, as in the case of new scientific discoveries invalidating previous theories?