The Supreme Court-backed Special Investigation Team (SIT) on black money has recommended a series of measures, including quoting the Permanent Account Number for all purchases beyond Rs 1 lakh, in addition to submitting an identity proof such as Aadhaar. The rule, as suggested by the SIT, should cover purchases made by cash as well as cheque. It has further recommended that a central "Know Your Customer" (KYC) database be set up, which captures details of PAN, passport number, or driving license number, often quoted for transactions.