code: func (r FutureListSinceBlockResult) Receive() (*btcjson.ListSinceBlockResult, error) {
  	res, err := receiveFuture(r)
  	if err != nil {
  		return nil, err
  	}
  
  	// Unmarshal result as a listsinceblock result object.
  	var listResult btcjson.ListSinceBlockResult
  	err = json.Unmarshal(res, &listResult)
  	if err != nil {
  		return nil, err
  	}
  
  	return &listResult, nil
  }
docs: // Receive waits for the response promised by the future and returns all
  // transactions added in blocks since the specified block hash, or all
  // transactions if it is nil.