joint regulation by such Commissions, but only with respect to the digital commodities and digital assets subject to their respective jurisdictions. (i) Rules The Commission shall adopt rules governing persons that are registered under this section. . 4. Definitions (a) In general Section 1a of the Commodity Exchange Act (7 U.S.C 1a) is amended by adding at the end the following: (52) Digital asset repository of transactions The term digital asset repository of transactions or DART means any person that collects and maintains information or records with respect to transactions or positions in, or the terms and conditions of digital commodities, digital assets, or digital collectibles (as determined a collectibles under section 408(m) of the Internal Revenue Code) entered into by third parties for the purpose of providing a centralized recordkeeping facility for digital commodities, digital assets, or digital collectibles. (53) Off-chain digital commodity transaction The term off-chain digital commodity transaction means any contract of sale of a digital commodity in interstate commerce which is not mined or validated and recorded on the appropriate public distributed ledger for such digital commodity within 24 hours of the transaction being entered into. . (b) Definition of registered entity Section 1a(40)(E) of the Commodity Exchange Act ( 7 U.S.C. 1a(40)(E) ) is amended by inserting or a digital asset repository of transactions after section 21 .