Content credentials - more verifiable metadata

I'm loving the Content Credentials beta. However, the only information that can be signed right now appears to be the producer/creator credit and the history (and I assume the thumbnail and ingredient file name, which are not optional).

First, please add the ability to optionally sign additional metadata in the image (copyright, creator, location, date/time, etc.). This is supported in C2PA here: https://c2pa.org/specifications/specifications/1.4/specs/C2PA_Specification.html#_common_metadata (which deprecated the EXIF/IPTC-specific assertions).

Second, let creators add metadata identifying them more fully using for example their social profiles and/or domains (Adobe allows this). See for example https://c2pa.org/specifications/specifications/1.4/specs/C2PA_Specification.html#_creative_work

Third, please document precisely what information is being transmitted to Capture One servers (or third-party servers) to perform the Content Credential generation/signature (is it the actual image, the actual thumbnail, just hashes of that + metadata, etc.?).

Finally, please make sure this credentials feature remains optional (as it is right now) - don't force credentials on the users like some of your competitors do, and continue to let creators choose exactly what to include vs. not include (sometimes the input image has a thumbnail that needs to be cropped out for privacy for example, and you don't want to include the history).