; and (B) does not include— (i) a blockchain protocol or a person or group of persons solely because of their development of a blockchain protocol; or (ii) a bank engaging in certain banking activities with respect to a restricted digital asset in the same manner as a bank is excluded from the definition of a broker under paragraph (4). (84) Digital asset custodian The term digital asset custodian means an entity in the business of providing custodial or safekeeping services for restricted digital assets for others. (85) Digital asset dealer The term digital asset dealer — (A) means any person engaged in the business of buying and selling restricted digital assets for such person’s own account through a broker or otherwise; and (B) does not include— (i) a person that buys or sells restricted digital assets for such person’s own account, either individually or in a fiduciary capacity, but not as a part of a regular business; (ii) a blockchain protocol or a person or group of persons solely because of their development of a blockchain protocol; or (iii) a bank engaging in certain banking activities with respect to a restricted digital asset in the same manner as a bank is excluded from the definition of a dealer under paragraph (5). (86) Digital asset trading system The term digital asset trading system — (A) means any organization, association, person, or group of persons, whether incorporated or unincorporated, that constitutes, maintains, or provides a market place or facilities for bringing together purchasers and sellers of restricted digital assets or for otherwise performing with respect to restricted digital assets the functions commonly performed by a stock exchange within the meaning of section 240.3b–16 of title 17, Code of Federal Regulations, as in effect on the date of enactment of this paragraph