EXHIBIT 3.1

Special Resolution of the Shareholders of the Company - NTA Requirement Amendment

It is resolved as a special resolution that the amended and restated memorandum and articles of association of HORIZON SPACE ACQUISITION I CORP. be amended by:

(i) deleting Articles 48.2, 48.4 and 48.5 in their entirety and replacing them with the following:

“48.2 Prior to the consummation of a Business Combination, the Company shall either:

(a) submit such Business Combination to its Members for approval; or

(b) provide Members with the opportunity to have their Shares repurchased by means of a tender offer for a per-Share repurchase price payable in cash, equal to the aggregate amount then on deposit in the Trust Account, calculated as of two business days prior to the consummation of such Business Combination, including interest earned on the Trust Account (net of taxes paid or payable, if any), divided by the number of then issued Public Shares. Such obligation to repurchase Shares is subject to the completion of the proposed Business Combination to which it relates.”

“48.4 At a general meeting called for the purposes of approving a Business Combination pursuant to this Article, in the event that such Business Combination is approved by Ordinary Resolution, the Company shall be authorised to consummate such Business Combination.”

“48.5 Any Member holding Public Shares who is not the Sponsor, a Founder, Officer or Director may, at least two business days’ prior to any vote on a Business Combination, elect to have their Public Shares redeemed for cash, in accordance with any applicable requirements provided for in the related proxy materials (the “IPO Redemption”), provided that no such Member acting together with any Affiliate of their or any other person with whom they are acting in concert or as a partnership, limited partnership, syndicate, or other group for the purposes of acquiring, holding, or disposing of Shares may exercise this redemption right with respect to more than 15% of the Public Shares in the aggregate without the prior consent of the Company. If so demanded, the Company shall pay any such redeeming Member, regardless of whether they are voting for or against such proposed Business Combination, a per-Share redemption price payable in cash, equal to the aggregate amount then on deposit in the Trust Account calculated as of two business days prior to the consummation of the Business Combination, including interest earned on the Trust Account (such interest shall be net of taxes payable) and not previously released to the Company to pay its taxes, divided by the number of then issued Public Shares (such redemption price being referred to herein as the “Redemption Price”), but only in the event that the applicable proposed Business Combination is approved and in connection with its consummation.”

(ii) amending Article 48.8 by deleting the words:

“The Company’s ability to provide such redemption in this Article is subject to the Redemption Limitation.”

Special Resolution of the Shareholders of the Company - MAA Amendment Proposal

It is resolved as a special resolution that the amended and restated memorandum and articles of association of Horizon Space Acquisition I Corp. be amended by:

"48.7 Notwithstanding any other provision of the Articles and the prospectus relating to the IPO, the Company shall consummate a Business Combination by October 27, 2025, provided however that if the board of Directors anticipates that the Company may not be able to consummate a Business Combination by October 27, 2025, the Company may, without the need for any further approval of the Members, extend the period of time to consummate a Business Combination up to six times, each by an additional month (for a total of up to six months until April 27, 2026 ) to complete a Business Combination, subject to the Sponsor or its designees depositing additional funds into the Trust Account for each one month period in accordance with terms as set out in the trust agreement governing the Trust Account and referred to in the prospectus relating to the IPO. In the event that the Company does not consummate a Business Combination by October 27, 2025, or (in the case of up to six valid extensions of an additional six month) April 27, 2026, or such later time as the Members may approve in accordance with the Articles, the Company shall:

and replacing them with the words:

EXHIBIT 10.1 

TRUST AMENDMENT

October 27, 2025

THIS AMENDMENT TO THE INVESTMENT MANAGEMENT TRUST AGREEMENT (this “Amendment”) is made as of October 27, 2025, by and between Horizon Space Acquisition I Corp., a Cayman Islands company (the “Company”), and Continental Stock Transfer & Trust Company (the “Trustee”). Capitalized terms contained in this Amendment, but not specifically defined in this Amendment, shall have the meanings ascribed to such terms in that certain Investment Management Trust Agreement, dated December 21, 2022, by and between the parties hereto (as the same may be amended, restated or supplemented, the “Trust Agreement”).

WHEREAS, Section 1(k) of the Trust Agreement provides that the Trustee shall commence liquidation of the Trust Account and distribute the Property in the Trust Account after receipt of, and only in accordance with, a Termination Letter; or in the event that a Termination Letter has not been received by the Trustee by December 27, 2024 or, in the event that the Company extended the time to complete the Business Combination for nine times, each for a one-month extension for a total of up to twelve months to December 27, 2025 but has not completed the Business Combination within the applicable monthly anniversary of the effective date of the prospectus;

WHEREAS, Section 7(c) of the Trust Agreement provides that Section 1(k) of the Trust Agreement may only be changed, amended or modified by the affirmative vote of a majority of the then outstanding Ordinary Shares, provided that all Public Shareholders must be given the right to receive a pro-rata portion of the trust account (no less than $10.175 per share plus the amount per share deposited in the Trust Account pursuant to any Extension Letter) in connection with any such amendment);

WHEREAS, the Company further obtained the approval of the holders of the affirmative vote of at least a majority of the then outstanding Ordinary Shares;

WHEREAS, the Company has obtained the written of Network 1 Financial Securities, Inc.

WHEREAS, each of the Company and Trustee desire to amend the Trust Agreement as provided herein.

NOW, THEREFORE, in consideration of the mutual agreements contained herein and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, and intending to be legally bound hereby, the parties hereto agree as follows:

(a) The third recital to the Trust Agreement is hereby amended and restated as follows:

WHEREAS, on October 27, 2025, the Company’s shareholders approved an amendment to the extension of the deadline to consummate an initial Business Combination to allow that, if the Company is not able to complete its initial Business Combination by October 27, 2025, the Company may extend the period for up to six times, each by an additional one-month extension, for a total of up to six months to April 27, 2026 (each, an “Extension”); and

(b) Section 1(k) of the Trust Agreement is hereby amended and restated in its entirety as follows:

(k) Commence liquidation of the Trust Account only after and promptly after receipt of, and only in accordance with, the terms of a letter (“Termination Letter”), in a form substantially similar to that attached hereto as either Exhibit A or Exhibit B, signed on behalf of the Company by its President, Chief Executive Officer or Chairman of the Board and Secretary or Assistant Secretary and, in the case of a Termination Letter in a form substantially similar to that attached hereto as Exhibit A, acknowledged and agreed to by Network 1, and complete the liquidation of the Trust Account and distribute the Property in the Trust Account only as directed in the Termination Letter and the other documents referred to therein; provided, however, that in the event that a Termination Letter has not been received by the Trustee by October 27, 2025 or, in the event that the Company extended the time to complete the Business Combination for six times, each for a one-month extension for a total of up to six months to April 27, 2026 but has not completed the Business Combination within the applicable monthly anniversary of the effective date of the prospectus, (“Last Date”), the Trust Account shall be liquidated in accordance with the procedures set forth in the Termination Letter attached as Exhibit B hereto and distributed to the Public Shareholders as of the Last Date.

[signature page to trust amendment]

IN WITNESS WHEREOF, the parties have duly executed this Amendment as of the date first set forth above.