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Hot take: The airgap didn't save Coldcard. A USB cable might have

stackernews-airgap-hot-take

https://stacker.news/items/1536826

Organisation
Stacker News
Evidence role
Community discussion
Published
2026-07-31
Source changes
0
Detected differences
0
Unreviewed
0
Copies held
1

sime arguing that airgapping protects against exfiltration, not against generating a bad seed, so a connected wallet mixing host entropy could have fared better. A design-philosophy dispute relevant to the mitigations pages; the claim is the author's and contested. Captured through the site's public GraphQL API: the rendered pages crash the capture tab, and the API answers POST from this host. The query fixes the captured surface to the item's title, text and two levels of comments, each with author and absolute timestamp.

Every check is recorded, including checks that found no text change. A detected edit is therefore bounded between two checks. The publisher's exact save time is not observable from this record. Last checked .

  1. Earliest copy held Current
    seen · Captured here 1,271 chars
    Extracted text as captured 
    {
  "data": {
    "item": {
      "comments": {
        "comments": [
          {
            "createdAt": "2026-07-31T12:56:25.434Z",
            "text": "I see your point, but just because a connected wallet *can* mix entropy sources doesn't mean it will be implemented correctly. \n\nAirgap or USB, this seems like an issue of bugs escaping notice and a new actor coming on the scene that notices a lot more. \n\nI wont be surprised if there is another one of these within the year: some major hardware (or software) wallet provider that has some very nitty bug in it that breaks everything.",
            "user": {
              "name": "Scoresby"
            }
          }
        ]
      },
      "createdAt": "2026-07-31T11:06:40.203Z",
      "text": "Airgapping protects against exfiltration, not against generating bad seeds in the first place, which we know just bit Coldcard users. A connected wallet can mix host entropy into seed generation, so a malicious host can only add randomness, never subtract it.\n\nThe USB cable gets mocked, but it's the second entropy source that would have made this bug a non-event.",
      "title": "Hot take: The airgap didn't save Coldcard. A USB cable might have",
      "user": {
        "name": "sime"
      }
    }
  }
}
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