Mk3 firmware history

cc-history-mk3

https://raw.githubusercontent.com/Coldcard/firmware/master/releases/History-Mk3.md

Organisation

Coinkite

Evidence role

Repository file

Published

continuously updated

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0

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0

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Copies held

1

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 15 Aug 2026, 12:24 UTC.

1. Earliest copy held Current
   seen 1 Aug 2026, 00:17 UTC · Captured here 35,315 chars
   Extracted text as captured

   *See ChangeLog.md for more recent changes, these are historic versions*
   **July 2026: Do not generate seeds on Mk3 hardware without 4.2.0 fixed version.
   Move funds to new seeds or a BIP-39 derived secret.**
   Follow the steps listed in
   [our blog announcement](https://blog.coinkite.com/coldcard-mk3-seed-generation-warning/)
   ## 4.2.0 - July 31, 2026
   - Hotfix to correct entropy bug and allow new seed generation on old hardware.
   ## 4.1.9 - Jun 26, 2023
   - Bugfix: QR codes could not be rendered in 4.1.8 release due to a regression.
   ## 4.1.8 - Jun 19, 2023
   - Bugfix: "Validating..." screen would be shown twice in some cases. Improves signing performance.
   - Bugfix: Reproducible builds corrected.
   ## 4.1.7 - Nov 15, 2022
   - Bugfix: Upgrades to 4.1.6 version using SD Card did not work due to an obscure alignment
     bug. USB upgrade did work. A workaround to this issue has been added for this release.
   ## 4.1.6 - Oct 5, 2022
   - Bugfix: order of multisig wallet registration does NOT matter in PSBT signing
   - Bugfix: allow unknown scripts in HSM mode
   - Enhancement: `OP_RETURN` is now a known script and is displayed in ascii if possible
   ## 4.1.5 - May 4, 2022
   - Enhancement: Support P2TR outputs (pay to Taproot) in PSBT files. Allows
     on-screen verification of P2TR destination addresses (`bc1p..`) so you can send
     your BTC to them. Does **not** support signing, so you cannot operate a Taproot
     wallet with Mk3 COLDCARD as the signing device.
   - Bugfix: Yikes error shown during BIP-85 menu operation.
   - Enhancement: Rename "Derive Entropy" to "Derive Seed B85" to match Mk4 menus
   ## 4.1.4 - Apr 26, 2022
   - Enhancement: if an XFP of zero is seen in a PSBT file, assume that should be replaced by
     our current XFP value and try to sign the input (same for change outputs and change-fraud
     checks).  This makes building a workable PSBT file easier and could be used to preserve
     privacy of XFP value itself. A warning is shown when this happens.
   - Enhancement: "Advanced > Export XPUB" provides direct way to show XPUB (or ZPUB/YPUB) for
     BIP-84 / BIP-44 / BIP-49 standard derivations, as a QR. Also can show XFP and master XPUB.
   - Bugfix: Updated domain name from `coldcardwallet.com` to `coldcard.com` in docs and few
     on-screen messages.
   - Bugfix: allow sending to scripts that we cannot parse, with a warning, to support
     `OP_RETURN` and other outputs we don't understand well (yet).
   ## 4.1.3 - Sep 2, 2021
   - Enhancement: support "importdescriptors" command in Bitcoin Core 0.21 so that
     a descriptor-based wallet is created. PSBT files are then supported natively by

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