code: func (r FutureGetBlockChainInfoResult) Receive() (*btcjson.GetBlockChainInfoResult, error) {
  	res, err := receiveFuture(r)
  	if err != nil {
  		return nil, err
  	}
  
  	var chainInfo btcjson.GetBlockChainInfoResult
  	if err := json.Unmarshal(res, &chainInfo); err != nil {
  		return nil, err
  	}
  	return &chainInfo, nil
  }
docs: // Receive waits for the response promised by the future and returns chain info
  // result provided by the server.