Yes, but while a blockchain could be useful there, the very act of editing defeats the point of the signature. Eg editing someone into or out of the photo. Vali

Yes, but while a blockchain could be useful there, the very act of editing defeats the point of the signature. Eg editing someone into or out of the photo. Validation by requiring the original unedited image to also be accessible doesn't work either since often the edits have a valid journalistic reason (eg to preserve a victim's anonymity). Allowing exceptions will just result in those exceptions dominating, just like how "anonymous sources tell us" has become a popular way to write clickbaiting hit pieces without having to actually back anything up with evidence. Personally I really don't buy the idea that we can technologically eliminate something as vague as fake images. The solution is a less gullible public, and an acceptance that the short interval where communication was easy and forgery was comparatively difficult, was an exceptional circumstance. We're just returning back to the norm.