Power of Attorney for Justin Mateen

The filing is a Limited Power of Attorney document executed by Justin Mateen, a director of American Bitcoin Corp. (formerly Gryphon Digital Mining, Inc.). The document appoints Aliza Rana, Michael Ho, Asher Genoot, and Matt Prusak as attorneys-in-fact to act on Mateen's behalf in matters related to the ownership and reporting of securities of American Bitcoin Corp. The attorneys-in-fact are authorized to prepare and submit Form ID, Forms 3, 4, and 5, and any other necessary documents to the U.S. Securities and Exchange Commission (SEC). The power of attorney remains in effect until Mateen is no longer required to file these forms or until it is revoked in writing. The document was executed on September 12, 2025.