We already have most of the required cryptographic primitives for this. PKI, trusted timestamping, secure hardware with remote attestation are some of the necessary building blocks. All that's really missing are camera sensors with built-in cryptography.

And societal care. Our society seems to really like to whine about "the danger of deepfake images", but our actions reveal that we don't really give a crap, as we could solve this problem today if we really wanted to.