Electrum with Coldcard

Franz Geffke

By Franz Geffke
28 November 2023

The Electrum package that ships with Guix does not support many hardware wallets out of the box - usually due to licensing reasons.

Today I added support for Coldcard to Electrum on PantherX Desktop. We inherit the upstream package, add the missing dependencies and load the udev rules.

name: electrum-cc
version: 4.4.6
+ out: everything
systems: x86_64-linux
dependencies: libsecp256k1@0.3.2 python-aiohttp-socks@0.7.1 python-aiohttp@3.8.4 python-aiorpcx@0.22.1
+ python-attrs@21.2.0 python-bitstring@3.1.7 python-btchip-python@0.1.32 python-certifi@2022.6.15
+ python-ckcc-protocol@1.4.0 python-cryptography@41.0.4 python-dnspython@2.1.0 python-hidapi@0.7.99.post21
+ python-ledgerblue@0.1.44 python-protobuf@3.20.1 python-pyqt@5.15.9 python-qdarkstyle@2.8.1 python-qrcode@7.3.1
+ zbar@0.23.90
location: px/packages/finance.scm:18:2
homepage: https://electrum.org/
license: Expat
synopsis: Bitcoin wallet
description: Electrum is a lightweight Bitcoin client, based on a client-server protocol.  It supports Simple
+ Payment Verification (SPV) and deterministic key generation from a seed.  Your secret keys are encrypted and are
+ never sent to other machines/servers.  Electrum does not download the Bitcoin blockchain.
relevance: 10

Install with:

guix package -i electrum-cc

Issues vs Merge Requests

Electrum also works with the Ledger Nano S and X.

If you are on guix, you can use these changes by:

  1. Get PantherX channel and install electrum-cc
  2. Add udev rules ref
  3. Add your user to plugdev group
  4. Reboot

Check if the device has been recognized:

dmesg | grep Coldcard
[  145.929515] usb 1-5.1: Product: Coldcard Wallet
[  145.948923] hid-generic ...: hiddev0,hidraw3: USB HID v1.11 Device [Coinkite Coldcard Wallet] on usb-0000:00:14.0-5.1/input3

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