code: func (h *Handler) Discovery(base string) *camtypes.SignDiscovery {
  	sd := &camtypes.SignDiscovery{
  		PublicKeyID:   h.entity.PrimaryKey.KeyIdString(),
  		SignHandler:   base + "camli/sig/sign",
  		VerifyHandler: base + "camli/sig/verify",
  	}
  	if h.pubKeyBlobRef.Valid() {
  		sd.PublicKeyBlobRef = h.pubKeyBlobRef
  		sd.PublicKey = base + h.pubKeyBlobRefServeSuffix
  	}
  	return sd
  }
docs: // Discovery returns the Discovery response for the signing handler.