Material Agreement, Amendments to Bylaws (Form 8-K)

Item 1.01. Entry into a Material Definitive Agreement.

On November 5, 2026, Chain Bridge I (the "Company") entered into Amendment No. 2 (the "Amendment No. 2") to the unsecured, non-interest-bearing promissory note in the aggregate amount of $1,250,000 (as amended by that certain Amendment No.1 to Senior Note, dated as of May 28, 2026, the "Senior Note"), originally issued on September 30, 2025, held by C/M Capital Master Fund LP. Pursuant to Amendment No. 2, among other things, the maturity date of the Senior Note was extended from November 15, 2026 to November 15, 2027.

The foregoing description of the Amendment No. 2 does not purport to be complete and is qualified in its entirety by reference to the full text of Amendment No. 2, which is filed as Exhibit 4.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Item 5.03. Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.

The information included in Item 5.07 is incorporated by reference in this item to the extent required.