IMO this would just help someone prove that a certain original image was made with a specific camera in regards of IP and to protect themselves at court against

IMO this would just help someone prove that a certain original image was made with a specific camera in regards of IP and to protect themselves at court against claims of having tampered with an image. What we see on the web are mostly resized and heavily compressed images. Not sure how such a cryptographic signature could work in such cases.