docs: def chain_list(self):
          """ GET /chain
  
          Use the Chain API to retrieve the current state of the blockchain.
          The returned BlockchainInfo message is defined inside fabric.proto.
  
          message BlockchainInfo {
              uint64 height = 1;
              bytes currentBlockHash = 2;
              bytes previousBlockHash = 3;
          }
          ```
  
          :return: json body of the blockchain info
          """
          res = self._get(self._url("/chain"))
          return self._result(res, True)