COLDCARD vulnerability what happened, and what to do
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Informational only. This is independent analysis and an evidence-backed explainer, not financial, security or legal advice, and not a substitute for professional advice about your own situation. It is not affiliated with, endorsed by, or speaking for Coinkite, Block, or any other party named here. Published estimates are attributed, and differing scenarios are kept separate with their assumptions. Act on your own judgement. Editorial standards and corrections.

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COLDCARD firmware downloads

coldcard-downloads

https://coldcard.com/downloads

Organisation
Coinkite
Evidence role
Firmware release index
Published
continuously updated
Source changes
1
Detected differences
1
Unreviewed
0
Copies held
2

Which firmware is actually being offered, and when it appeared.

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 2 Aug 2026, 00:57 UTC.

  1. source content difference between 1 Aug 2026, 00:17 UTC and 1 Aug 2026, 14:02 UTC Current source content +1 -1

    The site-wide advisory banner hardened from 'Seeds generated on firmware 4.0.1 or later may be at risk' to 'Seeds generated on firmware 4.0.1 (2021 or later) are at risk'.

    seen 1 Aug 2026, 14:02 UTC · Captured here text sha256 5e0504ed0b80b7ef1e13d3b7 2,561 chars
    What changed from the previous capture 2 lines
     COLDCARD Security Advisory
    -Seeds generated on firmware 4.0.1 or later may be at risk.
    +Seeds generated on firmware 4.0.1 (2021 or later) are at risk.
     Read advisory →
     Search COLDCARD
     Search
    
    Extracted text as captured
    COLDCARD Security Advisory
    Seeds generated on firmware 4.0.1 (2021 or later) are at risk.
    Read advisory →
    Search COLDCARD
    Search
    Technology
    NFC Push TX
    Key Teleport
    BBQr
    Trick PINs
    Seed XOR
    BIP-85
    Secure Notes & Passwords
    Encrypted Backups
    Address Explorer
    Multisig
    COLDCARD Co-Signing
    Descriptor Export
    MicroSD 2FA
    Temporary Seeds
    Get in touch
    X / Twitter
    Telegram
    Support
    Company
    About
    Resellers
    Resources
    Security
    FAQ
    Compare Hardware Wallets
    Advanced Topics
    Mk4 Security Model
    Blog
    Newsletter
    More from Coinkite
    OPENDIME
    SEEDPLATE
    BLOCKCLOCK mini
    TAPSIGNER Wallet

    Excerpt only. The complete copy is held offline and backs quotations on this site. The original publication remains the canonical public source.

  2. Earliest copy held
    seen 1 Aug 2026, 00:17 UTC · Captured here text sha256 50f719eb85ca5e26e736d639 2,557 chars
    Extracted text as captured
    COLDCARD Security Advisory
    Seeds generated on firmware 4.0.1 or later may be at risk.
    Read advisory →
    Search COLDCARD
    Search
    Technology
    NFC Push TX
    Key Teleport
    BBQr
    Trick PINs
    Seed XOR
    BIP-85
    Secure Notes & Passwords
    Encrypted Backups
    Address Explorer
    Multisig
    COLDCARD Co-Signing
    Descriptor Export
    MicroSD 2FA
    Temporary Seeds
    Get in touch
    X / Twitter
    Telegram
    Support
    Company
    About
    Resellers
    Resources
    Security
    FAQ
    Compare Hardware Wallets
    Advanced Topics
    Mk4 Security Model
    Blog
    Newsletter
    More from Coinkite
    OPENDIME
    SEEDPLATE
    BLOCKCLOCK mini
    TAPSIGNER Wallet

    Excerpt only. The complete copy is held offline and backs quotations on this site. The original publication remains the canonical public source.

How to check this yourself

Each copy above is identified by the SHA-256 of its extracted text, shown beside it, and the diffs are plain unified diffs. To verify a quotation, compare it against the page itself or against the Internet Archive's copies, which are independent of this project.

Complete captures are held offline rather than mirrored here, so this page shows diffs and excerpts. If a quotation is ever disputed, the full copy can be produced. Ask.