contentType property

Type (for example schema) of the attestation payload that was signed.

The verifier must ensure that the provided type is one that the verifier supports, and that the attestation payload is a valid instantiation of that type (for example by validating a JSON schema). Possible string values are:

• "CONTENT_TYPE_UNSPECIFIED" : ContentType is not set.
• "SIMPLE_SIGNING_JSON" : Atomic format attestation signature. See https://github.com/containers/image/blob/8a5d2f82a6e3263290c8e0276c3e0f64e77723e7/docs/atomic-signature.md The payload extracted from signature is a JSON blob conforming to the linked schema.