EXHIBIT 4.1
Consent of Independent Registered Public Accounting Firm
We consent to the reference to our firm under the caption “Experts-Independent Registered Public Accounting Firm” and to the use of our report dated October 3, 2022 in the Amendment No. 1 to the Registration Statement (File No. 333-266972) and related Prospectus of Guggenheim Defined Portfolios, Series 2257.
/s/ Grant Thornton LLP____________________
GRANT THORNTON LLP
Chicago, Illinois
October 3, 2022