Company: ABTC
Filing Date: 2025-08-15
Form Type: 424B3
Source: 0001213900-25-077441
Chunk: 1

Company: American Bitcoin Corp.
Filing Date: 2025-08-15
Form: 424B3
Chunk 1
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 supplement to the Registration Statement.

While Gryphon believes that the disclosures set
forth in the Definitive Proxy Statement/Prospectus comply fully with all applicable law and denies the allegations in the Demand Letters,
in order to moot the disclosure claims set forth in the Demand Letters, avoid nuisance and possible expense and business delays, and provide
additional information to its stockholders, Gryphon has determined voluntarily to supplement certain disclosures in the Definitive Proxy
Statement/Prospectus related to such claims with the supplemental disclosures set forth below (the “Supplemental Disclosures”).
These Supplemental Disclosures should be read in conjunction with the Definitive Proxy Statement/Prospectus, which is available at the
SEC’s website, www.sec.gov, and which Gryphon urges you to read in its entirety. Nothing in the Supplemental Disclosures shall be
deemed an admission of the legal merit, necessity or materiality under applicable laws of any of the disclosures set forth herein. To
the contrary, Gryphon and its board of directors (the “Gryphon Board”) specifically deny all allegations in the Demand Letters,
including the allegations that any additional disclosure was or is required or material.

The Supplemental Disclosures will not affect the
timing of Gryphon’s special meeting of stockholders (the “Special Meeting”), which is scheduled to be held on Wednesday,
August 27, 2025, at 10:00 a.m. Eastern Time, virtually via the Internet at https://www.cstproxy.com/gryphondigitalmining/bc2025,
unless postponed or adjourned to a later date. The Gryphon Board continues to recommend that you vote “FOR” the proposals being considered at the Special Meeting.

You should read carefully and in their entirety this Supplement and the Definitive Proxy Statement/Prospectus and all accompanying annexes and exhibits before voting your shares of Gryphon common stock. Please pay particular attention to the section titled “Risk Factors” beginning on page 17 in the Definitive Proxy Statement/Prospectus.

This Supplement is dated August 15, 2025.

Supplemental Disclosures to the Definitive Proxy Statement/Prospectus

The disclosure in the section titled “The Mergers—Background of the Mergers” beginning on page 74 of the Definitive Proxy Statement/Prospectus is hereby amended by:

Amending and restating the first full paragraph on page 75 as follows (with new text in underline):