Exhibit 99.5

UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

Unless stated otherwise or dictated by context, all capitalized terms used herein but not defined shall have the meanings set forth in the Current Report on Form 8-K/A filed by Signing Day Sports, Inc., a Delaware corporation, with the U.S. Securities and Exchange Commission on September 25, 2025 (the “Form 8-K/A”).

Introduction

The following unaudited pro forma condensed combined financial information combines the historical financial position and results of operations of Signing Day Sports and One Blockchain. In deriving the pro forma statement of operations for the year ended December 31, 2024, the results of operations of One Blockchain reflect the combination of its predecessor and successor periods, as presented in its audited financial statements included as Exhibit 99.2 to the Form 8-K/A.

Description of the Proposed Transaction

On May 27, 2025, Signing Day Sports, BlockchAIn, One Blockchain, and two wholly owned subsidiaries of BlockchAIn – Merger Sub I and Merger Sub II – entered into the Business Combination Agreement to effect the Business Combination. BlockchAIn, Merger Sub I and Merger Sub II are newly formed entities for purposes of participating in the transactions contemplated by the Business Combination Agreement. Under the terms of the Business Combination Agreement, at the closing of the business combination contemplated by the Business Combination Agreement, Merger Sub I will merge with and into Signing Day Sports, with Signing Day Sports surviving as a wholly owned subsidiary of BlockchAIn, and Merger Sub II will merge with and into One Blockchain, with One Blockchain surviving as a wholly owned subsidiary of BlockchAIn. In this transaction, all outstanding Signing Day Sports common stock will be cancelled and converted into the right to receive a number of BlockchAIn common shares that will not be less than 8.5% of the BlockchAIn common shares that will be outstanding on a fully diluted basis immediately after the Closing (excluding any out-of-the-money options and warrants). Each outstanding Signing Day Sports option and warrant will be assumed by BlockchAIn and converted into options and warrants, respectively, to acquire BlockchAIn common shares, with the same terms and conditions, including exercise price, and each assumed option will be fully vested. All outstanding One Blockchain membership interests will be converted into the right to receive a number of BlockchAIn common shares equal to the quotient of the total number of Signing Day Sports common shares outstanding immediately prior to the Closing on a fully diluted and as-converted basis, not including certain out-of-the-money derivative securities, divided by 0.085, less the total number of BlockchAIn common shares that the Signing Day Sports common stock will be converted into the right to receive at the effective time of the Business Combination, subject to certain adjustments.

In addition, the Business Combination Agreement provides for the issuance of the Earnout Shares to Tiger Cloud and VCV Digital if the 2026 EBITDA equals or exceeds $25 million. The Earnout Shares will equal 11.628% of the total number of BlockchAIn common shares issued to the One Blockchain Securityholders at the Closing, subject to adjustment. Tiger Cloud and VCV Digital may receive up to 2,384,282 and 2,384,282 additional BlockchAIn common shares, respectively, if the Earnout Shares are issued. If the conditions for the issuance of the Earnout Shares are met, the Earnout Shares will be issued within ten calendar days following the date on which BlockchAIn files its annual report for its 2026 fiscal year with the SEC.

In addition, BlockchAIn will issue to Maxim Group, as the financial advisor to One Blockchain (as the agreed consideration for advisory services provided to One Blockchain) and the designee of Maxim Partners (i) at the Closing a number of BlockchAIn common shares equal to 3.5% of the total transaction enterprise value, such issuance to be in accordance with the obligations of One Blockchain under the Advisory Agreement and (ii) at such time the Earnout Shares, if any, are issued a number of BlockchAIn common shares equal to 3.5% of the Earnout Shares issued at such time. Maxim Group may receive up to 172,953 additional BlockchAIn common shares if the Earnout Shares are issued. The number of BlockchAIn common shares issued to Maxim Group will reduce only the equity ownership otherwise allocable to the holders of One Blockchain membership interests.

The number of BlockchAIn common shares offered in connection with the Closing is expected to be 46,444,482 (subject to adjustment) and the price per BlockchAIn common share is expected to be approximately $5.06, which is an implied value, subject to adjustment, based on the number of shares of Signing Day Sports common stock that are outstanding at the Closing and the valuation of the Combined Company as determined by negotiations between the parties to the Business Combination Agreement. The market will determine the trading price of BlockchAIn common shares after the Closing. The value of the consideration that the Signing Day Sports Stockholders and the One BlockchAIn Securityholders will receive at the Closing are expected to be approximately $19,975,772 and $207,510,145 (subject to adjustment), respectively. The value of the consideration that Tiger Cloud and VCV Digital will receive at the Closing are expected to be approximately $103,755,073 and $103,755,073 (subject to adjustment), respectively. The value of the consideration that Jerry Tang will receive at the Closing, through his control of the shares to be issued to Tiger Cloud and VCV Digital, is expected to be approximately $142,974,490 (subject to adjustment). The aggregate value of the consideration that Maxim Group will receive at the Closing is expected to be approximately $7,523,164 (subject to adjustment).

The Business Combination Agreement provides that BlockchAIn may adjust the number of BlockchAIn common shares into which the Signing Day Sports common stock and the One Blockchain membership interests may be converted so long as the aggregate number of BlockchAIn common shares that the Signing Day Sports Stockholders are entitled to receive pursuant to the terms of the Business Combination Agreement will be at least 8.5% of the BlockchAIn common shares that are outstanding on a fully diluted basis immediately after the Closing (excluding any out-of-the-money options and warrants) and (ii) such adjustment does not have a negative impact on the qualification of the BlockchAIn common shares to become listed on the NYSE American.

Upon the Closing, it is anticipated that Signing Day Sports Stockholders will become owners of approximately 8.5% of BlockchAIn, One Blockchain securityholders will become owners of approximately 88.3% of BlockchAIn, and Maxim Partners (or its designees) will become owners of approximately 3.2% of BlockchAIn.

Commitment Fee Shares Issued

On July 21, 2025, Signing Day Sports entered into a Purchase Agreement, dated as of July 21, 2025 (the “Helena Purchase Agreement”), between Signing Day Sports and Helena Global Investment Opportunities 1 Ltd. (“Helena”). Under the Helena Purchase Agreement, Signing Day Sports has the right to direct Helena to purchase up to $10 million in shares of Signing Day Sports common stock. In consideration for the execution and delivery of the Helena Purchase Agreement, Signing Day Sports issued 50,000 shares of Signing Day Sports common stock to Helena with an aggregate value of $97,000, within one business day of the date of the authorization of such issuance by the NYSE American.

Pro Forma Accounting

The unaudited pro forma condensed combined financial information has been prepared to give effect to the following:

The accompanying unaudited pro forma condensed combined balance sheets as of June 30, 2025 were prepared as if the Business Combination had occurred on June 30, 2025, and the unaudited pro forma condensed combined statements of operations for the six months ended June 30, 2025 and for the fiscal year ended December 31, 2024 were prepared as if the Business Combination had occurred on January 1, 2024. The unaudited pro forma condensed combined financial information has been derived from and should be read in conjunction with the following:

The unaudited pro forma condensed combined financial information is provided for illustrative purposes only. It is not necessarily, and should not be assumed to be, indicative of the actual results that would have been achieved had the business combination been completed as of the dates indicated or that may be achieved in the future. In addition, the pro forma combined financial information does not consider potential effects of changes in market conditions, anticipated synergies, operating efficiencies, tax benefits, or other factors. The preliminary allocation of the pro forma purchase price is subject to adjustment and may vary significantly from the actual purchase price allocation that will be recorded upon the consummation of the transaction.

UNAUDITED PRO FORMA CONDENSED COMBINED CONSOLIDATED BALANCE SHEETS

UNAUDITED PRO FORMA CONDENSED COMBINED CONSOLIDATED STATEMENT OF OPERATIONS

FOR THE SIX MONTHS ENDED JUNE 30, 2025

UNAUDITED PRO FORMA CONDENSED COMBINED CONSOLIDATED STATEMENT OF OPERATIONS

FOR THE YEAR ENDED DECEMBER 31, 2024

NOTES TO UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

NOTE 1. BASIS OF PRO FORMA PRESENTATION

The unaudited pro forma condensed combined balance sheets as of June 30, 2025 were prepared as if the Business Combination had occurred on June 30, 2025, and the unaudited pro forma condensed combined statements of operations for the six months ended June 30, 2025 and for the fiscal year ended 2024 were prepared as if the Business Combination had occurred as of January 1, 2024. These unaudited pro forma condensed combined financial statements do not include adjustments for potential synergies, restructuring activities, or other anticipated cost savings.

The Closing is contingent upon the satisfaction or (where permissible) waiver of certain conditions, obtaining stockholder approval and the clearance of an initial listing application by NYSE American or other national securities exchange. As of the date of the Form 8-K/A, these conditions have not been satisfied or (where permissible) waived, and the Closing has not occurred. Additionally, purchase consideration and the fair value of the net assets acquired have not been fully determined. The amounts reflected in the pro forma financial statements for the purchase consideration and fair value of net assets acquired are preliminary and subject to adjustment upon the completion of the fair value measurement process. The final determination of fair value may result in significant changes to goodwill, depreciation expense and amortization expense for the periods presented. Any impacts from deferred taxes included in the pro forma financial information are preliminary and subject to adjustment. The final determination of the deferred taxes may result in significant changes to goodwill and income tax expense for the periods presented, as the measurement of deferred tax assets and liabilities is dependent on further evaluation of the tax basis of assets acquired and liabilities assumed, as well as applicable tax rates and laws in effect at the time of the Closing.

The following table summarizes the shares of Signing Day Sports common stock outstanding immediately prior to the consummation of the Business Combination:

The following table summarizes the pro forma BlockchAIn common shares outstanding immediately after the Closing of the Business Combination, assuming that no adjustments are made to the number of BlockchAIn common shares issued to the One Blockchain Securityholders, excluding the potential dilutive effects of the Earnout Shares and outstanding options and warrants, and BlockchAIn common shares issued to VCV Digital and Tiger Cloud:

NOTE 2. PURCHASE PRICE ALLOCATION

The preliminary purchase price for Signing Day Sports is as follows:

When accounting for a reverse acquisition, the consideration transferred is measured using the most reliably measured fair value. As a publicly traded company on the NYSE American, Signing Day Sports shares are more reliably measurable than BlockchAIn common shares or One Blockchain membership interests. On August 12, 2025, the last reported sale price of the Signing Day Sports common stock on the NYSE American was $1.62 per share, which was determined to be the most recent practicable date. Accordingly, a stock price of $1.62 per share was used in accounting for the acquisition.

As of the date of these unaudited pro forma condensed combined financial statements, BlockchAIn has not completed the detailed valuation study necessary to arrive at the required final estimates of the fair value of the Signing Day Sports’ assets to be acquired and liabilities to be assumed. A final determination of the fair value of Signing Day Sports’ assets and liabilities will be based on the information and assumptions that exist as of the date of the Closing, and, therefore, cannot be made prior to the acquisition date. Certain valuations and assessments, including valuations of property, plant and equipment, intangible assets, other assets and contract liabilities are in process. As a result, the pro forma adjustments are preliminary and are subject to change as additional information becomes available and as additional analysis is performed. The preliminary pro forma adjustments have been made solely for the purpose of providing the unaudited pro forma financial information. Upon completion of the acquisition, a final determination of fair value of Signing Day Sports’ assets and liabilities will be performed. Any increases or decreases in the fair value of assets acquired and liabilities assumed upon completion of the final valuations will be reflected in the actual reporting by BlockchAIn subsequent to the Closing. The final purchase price allocation may be materially different than that reflected in the pro forma allocation presented below.

The following table provides the Signing Day Sports common stock price sensitivity analysis for the potential impact of variations to the estimated purchase price:

The preliminary fair values of the assets acquired, and liabilities assumed as of the applicable assumed acquisition date are as follows:

NOTE 3. PRO FORMA ADJUSTMENTS

The pro forma adjustments included in the unaudited pro forma condensed combined financial statements reflect the following:

Transaction Accounting Adjustments to Unaudited Pro Forma Condensed Balance Sheet

Transaction Accounting Adjustments to Unaudited Pro Forma Condensed Combined Statements of Operations

NOTE 4. ACCOUNTING POLICIES

Management has performed a preliminary review of the accounting policies of Signing Day Sports and One Blockchain and has determined that no material adjustments are necessary at this time. However, finalization of the purchase accounting may result in certain adjustments upon further analysis and these adjustments may be material.

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