code: func (r FutureRescanBlocksResult) Receive() ([]btcjson.RescannedBlock, error) {
  	res, err := receiveFuture(r)
  	if err != nil {
  		return nil, err
  	}
  
  	var rescanBlocksResult []btcjson.RescannedBlock
  	err = json.Unmarshal(res, &rescanBlocksResult)
  	if err != nil {
  		return nil, err
  	}
  
  	return rescanBlocksResult, nil
  }
docs: // Receive waits for the response promised by the future and returns the
  // discovered rescanblocks data.
  //
  // NOTE: This is a btcsuite extension ported from
  // github.com/decred/dcrrpcclient.