[colonelspace]

This is just a certificate of authenticity that one either trusts or not, based on whatever one knows about secure enclaves, cryptography, or the device/person issuing the key/certificate.

I think the reality is that photographs and video are now like text, you trust the source or not.

I can write about Cleopatra's ability to snowboard and play Xbox, or I can make a photo with the caption "Cleopatra doing a 1080", and now I can make a video of it (probably).

I can also give you a certificate/key/blockchain whatever to prove it's "valid".