Fundamentally, web-archive or just signed hashes of existing documents to verify they haven’t been changed. Like this which the NED deleted. That also does require an institution dedicated to journalism or truthfulness or education.

The main problem is the immense power imbalance. The rich get richer has this inevitable outcome. We need a purge and restore a democratic government. It’s more a physics problem than an ideological one, a question of quantity of energy and forces. They have corrupted a large part of the population in one way or another, but they haven’t convinced the majority that truth is bad.