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I think other answers here are more essential - chain of custody, corroborating evidence, etc.
That said, Leica has released a camera that digitally signs its images, and other manufacturers are working on similar things. That will allow people to verify whether the image is original or has been edited. From what I understand Leica has some scheme where you can sign images when you update them too, so there's a whole chain of documentation. Here's a brief article
It's an interesting experiment, but why would we trust everything that Leica supposedly verified? The same shit with digital signatures and blockchain stuff. We are at the gates of the world where we have zero trust by default and would only intentionally outsource verification to third parties we trust, because penalties for mistakes are growing each day.
Well as I said, I think there's a collection of things we already use for judging what's true, this would just be one more tool.
A cryptographic signature (in the original sense, not just the Bitcoin sense) means that only someone who possesses a certain digital key is able to sign something. In the case of a digitally signed photo, it verifies "hey I, key holder, am signing this file". And if the file is edited, the signed document won't match the tampered version.
Is it possible someone could hack and steal such a key? Yes. We see this with certificates for websites, where some bad actor is able to impersonate a trusted website. (And of course when NFT holders get their apes stolen)
But if something like that happened it's a cause for investigation, and it leaves a trail which authorities could look into. Not perfect, but right now there's not even a starting point for "did this image come from somewhere real?"