This is probably one of those scenarios where if someone wants to fake it they're going to fake it (or at least it will be a never ending arms race, and I expect AI to keep close chase), while a basic security solution will suffice for 99% of use cases, including standard journalism. After all, skilled photoshop+computational tools can already do expert fakery in journalism. (Just look at the last Abroadinjapan video earlier today for a good callout of Photoshop editing to increase engagement).