On October 4th, the deposit trust and Clearing Corp (DTCC) announced that it would postpone the release of its block chain derivatives trading system for several months. Officially, the United States Central Securities Depository (CSD) said the delay was to allow additional testing of the modified Trade Information Warehouse (TIW). A DTCC spokesman said the project was progressing smoothly. DLT and cloud development have been completed, and DTCC will continue to conduct in-depth industry-wide testing with customers, suppliers and technology providers. However, additional testing time has been allocated to ensure that the technology is implemented in a prudent and safest manner. But a person familiar with the technology testing process said that the unease caused by Britain's withdrawal from Europe was also a factor in the delay.