And who/what defines that? The problem with your concept is not technical, it is social and systemic. If someone controls the definition of who is reputable, it is centralized control which will both be gatekeeping and susceptible to corruption. If no one controls it, it is personal opinion, not verification. Either way, it is susceptible to manipulation.
It is better to just treat all this the same as any other misinformation - by thinking about what we see. Education and critical thought go a long way, and we need to encourage people to use such tools when consuming media.
We do have certificate authorities, something similar could be used. Nothing stops you from signing your own keys, but it's worth what it's worth. The thing is, if I'm famous and my website has my public key, anyone can use it to check
And who/what defines that? The problem with your concept is not technical, it is social and systemic. If someone controls the definition of who is reputable, it is centralized control which will both be gatekeeping and susceptible to corruption. If no one controls it, it is personal opinion, not verification. Either way, it is susceptible to manipulation.
It is better to just treat all this the same as any other misinformation - by thinking about what we see. Education and critical thought go a long way, and we need to encourage people to use such tools when consuming media.