https://github.com/c2pa-org/specifications/blob/153a62110fa0f6a61d4b960509fc50a645c6c2e1/build/site/specifications/2.1/specs/C2PA_Specification.html#L5981C1-L5983C1 It is hard to read. h5 is small, I would really stop at h4 or change the h5 and h6 to not be so small.