public IRpcMethodResult GetBlockHeader(string blockHash, int format = 0)
        {
            try
            {
                var blockComponent = new BlockComponent();
                var header         = blockComponent.GetBlockHeaderMsgByHash(blockHash);

                if (header != null)
                {
                    if (format == 0)
                    {
                        var bytes  = header.Serialize();
                        var result = Base16.Encode(bytes);
                        return(Ok(result));
                    }
                    else
                    {
                        return(Ok(header));
                    }
                }
                else
                {
                    return(Ok());
                }
            }
            catch (CommonException ce)
            {
                return(Error(ce.ErrorCode, ce.Message, ce));
            }
            catch (Exception ex)
            {
                return(Error(ErrorCode.UNKNOWN_ERROR, ex.Message, ex));
            }
        }