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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
Hardware signing stuff is not a real solution. It's security through obscurity.
If someone has access to the hardware, they technically have access to the private key that the hardware uses to sign things.
A determined malicious actor could take that key and sign whatever they want to.