That's right. According to the Interim Measures for Investment Management of the National Social Security Fund, it can be known that the main form of commercial banks' service for the national social security fund is the custody of revenue and expenditure accounts. The so-called fund custody business of revenue and expenditure account refers to an asset custody business in which banks are entrusted by receiving and paying customers to keep the funds of revenue and expenditure account, supervise the use of funds and disclose information.