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New Leica camera stops deepfakes at the shutter
(spectrum.ieee.org)
This is a most excellent place for technology news and articles.
I was too tired to investigate further last night. That is the case here, sections of data are hashed and used to create the certs:
https://c2pa.org/specifications/specifications/1.3/specs/C2PA_Specification.html#_hard_bindings
Which means that there isn't a way to edit the photo and have the cert match, and also no way to compress or change the file encoding without invalidating the cert.
so it's for jpeg shooters, basically. unfortunately the leica bodies aren't really known for producing good jpegs.