Exhibit 23.1

​

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

​

We hereby consent to the use in the Prospectus constituting a part of this Registration Statement on Form S-1 of our report dated July 24, 2026, which includes an explanatory paragraph related to Rainier Acquisition Corporation’s ability to continue as a going concern, relating to the financial statements of Rainier Acquisition Corporation as of and for the years ended December 31, 2025 and 2024, which is contained in that Prospectus.

​

We also consent to the reference to our firm under the caption “Experts” in the Prospectus.

​

/s/ WithumSmith+Brown, PC

​

New York, New York

August 6, 2026