# Functions
SanitizeTargetArtifact filters out unrelated ocispec.Descriptor fields based on notation spec (https://github.com/notaryproject/notaryproject/blob/main/specs/signature-specification.md#payload).
SigningTime returns the signing time of a signature envelope blob.
ValidatePayloadContentType validates signature payload's content type.
# Constants
MediaTypePayloadV1 is the supported content type for signature's payload.
MediaTypePayloadV1 is the supported content type for signature's payload.