I don't believe a signing solution is feasible. It's currently too complicated for even a lot of IT experts, and the amount of actors involved is too large to even move to a single unified solution.
Given that as of now authenticity can still be verified by experts, it's back to trusting journalistic outlets to properly verify news and sources.
Given that as of now authenticity can still be verified by experts, it's back to trusting journalistic outlets to properly verify news and sources.