Sure but then the image gets copied shared reposted etc. If the images had cryptographic provenance included, sites like Reddit or Twitter could verify and display that, or lack thereof.
I would use the same infrastructure as HTTPS, so an image could be signed by bbc.co.uk. That way if you trust that domain you could trust the document, wherever you come across it.
But why? If it is on bbc s website bbc is already saying it is good. Same for any other media. The technical approach is interesting but not needed IMO in this case.
I would use the same infrastructure as HTTPS, so an image could be signed by bbc.co.uk. That way if you trust that domain you could trust the document, wherever you come across it.