X0206 3 2025-09-29 0 0002042292 BTC Development Corp. BDCI 0002086269 BTC Development Sponsor LLC 2929 ARCH STREET, SUITE 1703 PHILADELPHIA PA 19104 true Class A Ordinary Shares 512500 D Class B Ordinary Shares Class A Ordinary Shares 4590334 D Warrants 11.5 Class A Ordinary Shares 128125 D These shares underlie 512,500 placement units of the issuer that BTC Development Sponsor LLC has irrevocably committed to purchase. Each placement unit consists of one Class A ordinary share and one-fourth (1/4) of one redeemable warrant. The reporting persons disclaim beneficial ownership of these securities, except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that a reporting person is the beneficial owner of such securities for any other purpose. The Class B ordinary shares will automatically convert into Class A ordinary shares at the time of the issuer's business combination, or at any time and from time to time at the option of the holder, on a one-for-one basis, subject to certain adjustments described in the issuer's charter documents, and have no expiration date. The warrants will become exercisable at the later of 30 days after consummation of the issuer's initial business combination or 12 months from the completion of the issuer's initial public offering. The warrants will expire five years after the consummation of the issuer's initial business combination or earlier upon redemption of all of the issuer's outstanding Class A ordinary shares or the issuer's liquidation. These warrants underlie 512,500 units of the issuer that BTC Development Sponsor LLC has irrevocably committed to purchase. Includes up to 550,000 shares that are subject to forfeiture in the event the underwriters of the issuer's initial public offering do not exercise their over-allotment option in full. Exhibit 24 - Power of Attorney /s/ R. Maxwell Smeal 2025-09-30