code: func NewChaincodeEvent(chaincodeID, eventName, txID string, payload []byte, blockNum uint64, sourceURL string) *fab.CCEvent {
  	return &fab.CCEvent{
  		ChaincodeID: chaincodeID,
  		EventName:   eventName,
  		TxID:        txID,
  		Payload:     payload,
  		BlockNumber: blockNum,
  		SourceURL:   sourceURL,
  	}
  }
docs: // NewChaincodeEvent creates a new ChaincodeEvent