A number of international
companies, including Cisco Systems Inc, the world's largest networking gear maker, and
German software giant SAP, have agreed to the reviews, though others, including
cybersecurity firm Symantec, have refused because of security concerns.
In January 2017, a group including U.S. networking giant Cisco,
German engineering firm Bosch, Bank of New York Mellon, Chinese electronics maker Foxconn, Dutch
cybersecurity company Gemalto and a number of blockchain startup
companies formed to develop just such a system.