public Task <ResultWrapper <ExecutionPayloadV1?> > HandleAsync(byte[] payloadId) { string payloadStr = payloadId.ToHexString(true); Block? block = _payloadPreparationService.GetPayload(payloadStr); if (block == null) { // The call MUST return -38001: Unknown payload error if the build process identified by the payloadId does not exist. if (_logger.IsWarn) { _logger.Warn($"Block production for payload with id={payloadId.ToHexString()} failed - unknown payload."); } return(ResultWrapper <ExecutionPayloadV1?> .Fail("unknown payload", MergeErrorCodes.UnknownPayload)); } if (_logger.IsInfo) { _logger.Info($"GetPayloadV1 result: {block.Header.ToString(BlockHeader.Format.Full)}."); } return(ResultWrapper <ExecutionPayloadV1?> .Success(new ExecutionPayloadV1(block))); }