Command Line Tools
Recommended for Advanced Users Only
To install the
ckcc-protocol package from PyPI, use this command:
% pip install "ckcc-protocol[cli]"
This should install a new command:
ckcc command has many subcommand and options. Please use the build-in help
to find your way.
% ckcc Usage: ckcc [OPTIONS] COMMAND [ARGS]... Options: -s, --serial HEX Operate on specific unit (default: first found) -x, --simulator Connect to the simulator via Unix socket --help Show this message and exit. Commands: addr Show the human version of an address backup Creates 7z encrypted backup file after... bag Factory: set or read bag number -- single use... debug Start interactive (local) debug session eval Simulator only: eval a python statement exec Simulator only: exec a python script list List all attached Coldcard devices logout Securely logout of device (will require... msg Sign a short text message pass Provide a BIP-39 passphrase reboot Reboot coldcard, force relogin and start over sign Approve a spending transaction (by signing it... test Test USB connection (debug/dev) upgrade Send firmware file (.dfu) and trigger upgrade... upload Send file to Coldcard (PSBT transaction or... version Get the version of the firmware installed xfp Get the fingerprint for this wallet (master... xpub Get the XPUB for this wallet (master level,...
Some useful commands follow.
% ckcc upgrade --help Usage: ckcc upgrade [OPTIONS] FIRMWARE.dfu Send firmware file (.dfu) and trigger upgrade process Options: -s, --stop-early Stop just before reboot --help Show this message and exit. % ckcc upgrade firmware-signed.dfu 675328 bytes (start @ 293) to send from 'firmware-signed.dfu' Uploading [###---------------------------------] 8% 0d 00:01:18
Sign a text message
% ckcc msg --help Usage: ckcc msg [OPTIONS] MESSAGE Sign a short text message Options: -p, --path TEXT Derivation for key to use -v, --verbose Include fancy ascii armour -j, --just-sig Just the signature itself, nothing more --help Show this message and exit. % ckcc msg "Hello world" Hello world mp2SHbLDr5hg4tvKhaZGKzkf3GmzAuQCz1 H3wh0RIKoIcyRShkbMm5SbVoKaeMYlf4up7dvVfvP1c1N5FEXoBcjiiTNxR88ybpW3XlujHGhyCvy2/hnMtSE+c=
Sign a Spending Transaction
% ckcc sign --help Usage: ckcc sign [OPTIONS] PSBT_IN PSBT_OUT Approve a spending transaction (by signing it on Coldcard) Options: -v, --verbose Show more details -f, --finalize Show final signed transaction, ready for transmission --help Show this message and exit.
This program can also speak to the Coldcard Simulator, if it's running on the same computer.
Use the global
-x flag, to connect to the simulator instead of the first Coldcard:
ckcc -x xpub
ckcc-protocol package includes the python library for USB communication with the
Coldcard. It can also be used with the simulator.
Linux udev support file.