a list of all Federal licenses, certifications, or registrations required to create or trade in digital assets. 6. Requirements related to crypto-currencies (a) Tracing of transactions Notwithstanding section 3(c), the Secretary of the Treasury, acting through the Financial Crimes Enforcement Network, shall issue rules to require each crypto-currency (including synthetic stablecoins) to allow for the tracing of transactions in the crypto-currency and persons engaging in such transactions in a manner similar to that required of financial institutions with respect to currency transactions under subchapter II of chapter 53 of title 31, United States Code. (b) Reserve-Backed stablecoin audits The Secretary of the Treasury, acting through the Financial Crimes Enforcement Network, shall carry out audits of each reserve-backed stablecoin to ensure that such stablecoin is fully backed by currency issued by the United States or a foreign government. (c) Transition rule for stablecoins If an event (including a dilution event, technical hack, or concerted choice) causes a reserve-backed stablecoin to become a synthetic stablecoin or for a synthetic stable to become a reserve-backed stablecoin, the primary Federal digital asset regulator of the stablecoin shall notify the issuer of the stablecoin and the public of such transition.