Exhibit 99(s)(2)

POWER OF ATTORNEY

KNOWN ALL PERSONS BY THESE PRESENTS, that the undersigned constitutes and appoints each of Philip Liu and Richard Malinowski his true and lawful attorney-in-fact and agents, each with full power of substitution and resubstitution for his in his name, place and stead, to sign any and all Registration Statements applicable to the Arca U.S. Treasury Fund and any amendments or supplements thereto, and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission and the states, granting unto said attorney-in-fact and agent full power and authority to do and perform each and every act and thing requisite and necessary to be done, as fully to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, or his or her substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

Signature	Title	Date
/s/ Bruce Park	Trustee	December 11, 2019
Bruce Park