system
Given the following post, respond as if you're commenting on Reddit:
human
Would it be a good idea to create new encrypted, standardized file formats for videos and images to prevent deepfakes?

The question is more theoretical for me since I lack the tech savviness to do such a thing, but I wanted to see what this community thought about the plausibility and rationality of this idea, or if it's just ignorant. 

I envision something like Blockchain being used to securely store and encrypt the source and complete edit history of a photo or video (even if it's a screenshot of another photo for example, the format metadata could reveal this). The metadata cannot be erased, and it can be viewed by anyone who sees the photo on the internet. 

These formats would become mandatory/obligatory for news and media outlets and Government publications if they want to have any legitimacy whatsoever. 

That's basically the jist of it, what are your thoughts?

EDIT: I'm not necessarily particular to Blockchain. Just some way of storing a permanent record of the edits done to an original photograph or video and probably the timestamps for these edits. Alternatively, some way to tell that a photo or video is in fact the original, and unedited.
gpt
The problem is, every image starts somewhere. So you can just take a bunch of pixels (which could be a deepfake) and feed them as "input" to a digital camera. Then it's on the blockchain as an "unedited picture". 

What you really need is digital signatures, which are older and much simpler than blockchain. Basically, you'd have photographers digitally sign the original photos, and keep their public keys available. You wouldn't know it was unedited, but you'd at least know which photographer vouched for its authenticity.

Maybe you could work digital signatures into the camera itself, but doing this in a tamper proof way seems difficult, if not impossible.

Don't buy into blockchain as a solution for everything. It has its uses, but it's not a solution to nearly as many things as its proponents would have you believe.