It 100% guarantees that the content was signed by whomever signed it. The problem then becomes much simpler: do you trust the signer or not. And you can base th

It 100% guarantees that the content was signed by whomever signed it. The problem then becomes much simpler: do you trust the signer or not. And you can base that decision on what others are saying about the signer (using signed content obviously) or other things also signed by the same person or entity. Once you have that, unsigned content or content signed by AIs is easy to spot. Because it would either have no reputation at all, or a poor one. Signatures are impossible to forge (or sufficiently hard that we can assume so), and easy to verify. Reputations are a bit more work but we could provide some tools for that or search engines and other content aggregators could check things for us. But it all starts with a simple signature. Once you have lots of people signing their work, checking their reputation becomes easy. And the nice thing with a reputation is that people care about guarding it is as well. Reputation is hard to fake; you build it throughout your life. And you stake it with everything you publish. There's no need for blockchains or any fancy nonsense like that. It might help but it's a bit of a barrier to taking this into use.