code: func (o *Owner) KeyID() string {
  	if o == nil || len(o.keyID) == 0 {
  		return ""
  	}
  	return o.keyID[0]
  }
docs: // KeyID returns the GPG key ID (e.g. 2931A67C26F5ABDA) of the owner. Its
  // signature might change when support for multiple GPG keys is introduced.