I think the solution to this could be the "web of trust" - as used with PGP. Everyone can sign their images with their private keys. Whether you think those images are trustworthy then depends on who else trusts that. For example, you could have some newspapers verify/trust their journalists camera's. And you could trust your friends camera's etc.

It’s not so easy to attack secure hardware. It won’t be an option for the vast majority of deep fake producers.