Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

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We hereby consent to the use in the Prospectus constituting a part of this Registration Statement on Form S-1 of our report dated August 19, 2025, relating to the financial statements of SilverBox Corp V, as of June 16, 2025 and for the period from May 29, 2025 (inception) through June 16, 2025, which is contained in that Prospectus. We also consent to the reference to our firm under the caption “Experts” in the Prospectus.

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/s/ WithumSmith+Brown, PC

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New York, New York

August 19, 2025