Upgrade of Bitmain miners from T21 to S21 Pro
Company: Cipher Mining
What the later record shows
Not a promise: a reported event · happened June 5, 2024
The upgrade from T21 to S21 Pro miners was made through the June 5, 2024 Supplemental Agreement, which had already been signed when the claim was made.
“upgraded the purchase of 37,396 Antminer T21 miners to 30,364 Antminer S21 Pro miners (the “Bitmain Miners”)”
2024-06-09 · Cipher Mining 8-K filed 2024-06-10 View cached copy (2026-08-31)Live source ↗
Checked October 10, 2026 against filings, releases and reporting published after the claim was made. Quotes are verbatim from the linked documents.
The claim, verbatim
Cipher Mining upgraded its purchase from 37,396 Antminer T21 miners to 30,364 Antminer S21 Pro miners
Source (primary)
Cipher Mining 8-K filed 2024-06-10 (SEC EDGAR, sec_filing)
View cached copy (2026-08-31)Live source ↗
Quote: “upgraded the purchase of 37,396 Antminer T21 miners to 30,364 Antminer S21 Pro miners”
How we checked this
Checked on October 11, 2026. The cited source supports every part of this claim.
The filing states the Bitmain Supplemental Agreement upgraded the order from 37,396 T21 miners to 30,364 S21 Pro miners.
Confirmed in the source:
- Cipher Mining, through its subsidiary, entered a Supplemental Agreement with Bitmain
- The Supplemental Agreement upgraded the purchase of 37,396 Antminer T21 miners to 30,364 Antminer S21 Pro miners
What we did: Read our cached copy of SEC EDGAR (https://www.sec.gov/Archives/edgar/data/1819989/000119312524158407/d846288d8k.htm) in full (6,240 characters, retrieved August 31, 2026) and checked each assertion in the claim against it.
Additional evidence
confirms Cipher Mining 8-K filed 2024-06-10
Quote: “upgraded the purchase of 37,396 Antminer T21 miners to 30,364 Antminer S21 Pro miners”