As per https://docs.google.com/document/d/1bsi9JCnmOMSZCDh3VmDCO1m17w1aNexX09naomcpUOs/edit the oci-image-tool should have more verbose output, more concretely:

Print ...

• the digests of objects
• the version of the spec tested against
• canonical mimetypes and alternative
• the version of the validator code
• a list of tests that were ran
• a list of errors

I did implement the last point ("a list of errors") actually already, so I am wondering what additional requirements are needed here.

/cc @philips