Company: ABTC
Filing Date: 2025-08-15
Form Type: 424B3
Source: 0001213900-25-077441
Chunk: 0

Company: American Bitcoin Corp.
Filing Date: 2025-08-15
Form: 424B3
Chunk 0
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| PROXY STATEMENT/PROSPECTUS SUPPLEMENT 
 NO. 1                                 
 (to Proxy Statement/Prospectus dated  
 July 31, 2025)                        |     | Filed Pursuant to           
 Rule 424(b)(3)              
 Registration No. 333-287865 |

<div align='center'>GRYPHON DIGITAL MINING, INC.</div>

This proxy statement/prospectus supplement No. 1
(this “Supplement”) supplements the proxy statement/prospectus, dated July 31, 2025 (the “Definitive Proxy Statement/Prospectus”),
which forms a part of the Registration Statement on Form S-4 (No. 333-287865) of Gryphon Digital Mining, Inc., a Delaware corporation
(“Gryphon”), filed with the U.S. Securities and Exchange Commission (the “SEC”) on June 6, 2025, and amended
on July 1, 2025, July 22, 2025 and July 29, 2025 (the “Registration Statement”). The Registration Statement
was declared effective on July 31, 2025.

Introduction and Explanatory Note

As previously disclosed, on May 9, 2025,
Gryphon, GDM Merger Sub I Inc., a Delaware corporation and wholly owned direct subsidiary of Gryphon (“Merger Sub Inc.”),
GDM Merger Sub II LLC, a Delaware limited liability company and wholly owned direct subsidiary of Gryphon (“Merger Sub LLC”),
and American Bitcoin Corp., a Delaware corporation (“ABTC”), entered into an Agreement and Plan of Merger (the “Merger
Agreement”), pursuant to which, subject to the terms and conditions set forth therein, (i) Merger Sub Inc. will merge with and into
ABTC, with ABTC surviving the merger (the “First Merger”) as a wholly owned direct subsidiary of Gryphon (the corporation
surviving the First Merger, the “First Merger Surviving Corporation”) and (ii) immediately after the First Merger, the First
Merger Surviving Corporation will merge with and into Merger Sub LLC, with Merger Sub LLC surviving the merger as a wholly owned direct
subsidiary of Gryphon.

Since the initial filing of the Registration
Statement, six purported stockholders of Gryphon have sent demand letters (the “Demand Letters”) requesting that Gryphon
provide additional disclosures in an amendment or