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

Source changes

0

Detected differences

0

Unreviewed

0

Copies held

1

Carries the 4.2.0 entry and the do-not-generate banner.

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. Earliest copy held Current
   seen 1 Aug 2026, 00:17 UTC · Captured here text sha256 891b144b88b70f5d3d77a001 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

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