This repository contains the Nervos BOLOS application for the Ledger Nano S and Ledger Nano X and tools for testing the application. While this app is currently under development, we do not recommend using it with mainnet CKB.
These applications has been developed against our forks of CKB-CLI and CKB. Most instructions assume you have the Nix Package Manager, which you can install on any Linux distribution or MacOS. Application and wallet developers who would like to support Ledger can do so with Nervos' LedgerJS package - hw-app-ckb, which can also be found on NPM.
System requirements differ based on if you are using or installing the application. If you are using a Linux machine, you will need to Prepare your Linux Machine for Ledger Device Communication for both installing and usaging the application.
This applications are built against Ledger Nano S firmware 1.6.0 and Ledger Nano X firmware 1.2.5-1.5. Please use Ledger Live to manage your Ledger device's firmware.
Installation requirements differ based on installation method:
Ledger Live is the easiest way to install applications on your Ledger device. Please refer to Ledger Live's system requirements for this installation method. This application is still in active development and not yet available in Ledger Live.
- Linux: Supported. Debian distributions such as Ubuntu (18.04+) and NixOS (v19.03+). Other linux distributions may work, but have not been tested.
- Mac: Supported. This has been tested on Catalina 10.15.5. Other versions may work, but have not been tested.
- Windows: Not currently supported.
- libusb and libudev: On Debian distributions, including Ubuntu, these packages are suffixed with
-dev. Other distributions may have their own conventions.- Linux Installation:
sudo apt-get install libusb-1.0.0-dev libudev-dev - Mac Installation: N/A (not necessary)
- Linux Installation:
- Python3: Use
python3 --versionto check whether you have python3 installed or to confirm an installation was successful.- Linux Installation:
sudo apt-get install python3-pip # Ubuntu example - Mac Installation: Python 3 can be installed on mac with homebrew:
brew install python
- Linux Installation:
- virtualenv: Use
virtualenv --versionto check whether you have virtualenv installed or to confirm an installation was successful.- Linux Installation: To install using python3:
pip3 install virtualenv(this may requiresudo). - Mac Installation: To install using python3:
pip3 install virtualenv(this may requiresudo).
- Linux Installation: To install using python3:
- Linux: Supported. Debian distributions such as Ubuntu (18.04+) and NixOS (vXXX+). Other linux distributions may work, but have not been tested.
- Mac: Supported on Mojave (10.14), but not supported on Catalina due to issues with Nix installation.
- Windows: Not currently supported.
- Nix Package Manager: Use
nix-env --versionto check whether you have Nix installed or to confirm an installation was successful. We recommend checking which Nix Installation is right for you, but for most users the following will will work:- Linux Installation:
sh <(curl -L https://nixos.org/nix/install) --daemon - Mac Installation:
sh <(curl -L https://nixos.org/nix/install) --daemon
- Linux Installation:
These applications are built against Ledger Nano S firmware 1.6.0 and Ledger Nano X firmware 1.2.4-1. Please use Ledger Live to manage your Ledger device's firmware.
Most of the instructions in this README cover how to use the Ledger application with Nervos' client, CKB-CLI. If you have installed CKB-CLI from its upstream location, please refer to their system requirements.
If you are using this application with a wallet, please refer to that wallet's system requirements.
On Linux, the "udev" rules must be set up to allow your user to communicate with the ledger device. MacOS devices do not need any configuration to communicate with a Ledger device, so if you are using Mac you can ignore this section.
On NixOS, one can easily do this with by adding the following to configuration.nix:
{
# ...
hardware.ledger.enable = true;
# ...
}For non-NixOS Linux distros, LedgerHQ provides a script for this purpose, in its own specialized repo. Download this script, read it, customize it, and run it as root:
$ wget https://raw.githubusercontent.com/LedgerHQ/udev-rules/master/add_udev_rules.sh
$ chmod +x add_udev_rules.sh
We recommend against running the next command without reviewing the script and modifying it to match your configuration.
$ sudo ./add_udev_rules.sh
Subsequently, unplug your ledger hardware wallet, and plug it in again for the changes to take effect.
For more details, see Ledger's documentation.
There are 3 ways you can install this Ledger application:
- Ledger Live (not yet available): Ledger Live is the easiest way to install applications on your Ledger device. However, this application is still in active development and not yet available in Ledger Live.
- Installing from Release: This is the recommended installation method until this app is available in Ledger Live.
- Installing from Source: Recommended for development only.
Note: You can only install applications on the Ledger Nano X through Ledger Live.
Please download nano-s-release.tar.gz from the latest release on the releases page of this repo, which contains a pre-compiled app or .hex file ready to install on the Ledger. The following sections describe how to install it, including acquiring other tools from the Ledger project.
The next two sections describe how to install tools that you will need to interact with the Ledger.
On NixOS, these tools can be loaded into a nix-shell by simply running:
$ nix/env.sh sOn a macOS with Nix installed, you can instead use:
$ nix-shell -p 'python3.withPackages (p: [p.ledgerblue])' libusbOtherwise, follow the next two sections.
Install libusb and libudev, with the relevant headers. On Debian-based distros, including Ubuntu, the packages with the headers are suffixed with -dev. Other distros will have their own conventions. So, for example, on Ubuntu, you can do this with:
$ sudo apt-get install libusb-1.0.0-dev libudev-dev # Ubuntu example
Then, install pip3. You must install pip3 for this and not pip. On Ubuntu:
$ sudo apt-get install python3-pip # Ubuntu example
Now, on any operating system, install virtualenv using pip3. It is important to use pip3 and not pip for this, as this module requires python3 support.
$ sudo pip3 install virtualenv # Any OS
Then create a Python virtual environment (abbreviated virtualenv). You could call it anything, but we shall call it "ledger". This will create a directory called "ledger" containing the virtualenv:
$ virtualenv ledger # Any OS
Then, you must enter the virtualenv. If you do not successfully enter the virtualenv, future commands will fail. You can tell you have entered the virtualenv when your prompt is prefixed with (ledger).
$ source ledger/bin/activate
Your terminal session -- and only that terminal session -- will now be in the virtual env. To have a new terminal session enter the virtualenv, run the above source command only in the same directory in the new terminal session.
We can now install ledgerblue, which is a Python module designed originally for Ledger Blue, but also is needed for the Ledger Nano S/X.
Although we do not yet support Ledger Blue, you must still install the following python package. Within the virtualenv environment -- making sure that (ledger) is showing up before your prompt -- use pip to install the ledgerblue Python package. This will install the Ledger Python packages into the virtualenv; they will be available only in a shell where the virtualenv has been activated.
$ pip install ledgerblue
If you have to use sudo or pip3 here, that is an indication that you have not correctly set up virtualenv. It will still work in such a situation, but please research other material on troubleshooting virtualenv setup.
Next you'll use the installation script to install the application on your Ledger device.
The Ledger device must be in the following state:
- Plugged into your computer
- Unlocked (enter your PIN)
- On the home screen (do not have any application open)
- Not asleep (you should not see vires in numeris is scrolling across the screen)
If you are already in an application or the Ledger device is asleep, your installation process will fail.
We recommend staying at your computer and keeping an eye on the Ledger device's screen as you continue. You may want to read the rest of these instructions before you begin installing, as you will need to confirm and verify a few things during the process.
Still within the virtualenv, run the ./install.sh command included in the nano-s-release.tar.gz that you downloaded. This ./install.sh script takes the path to an application directory. The only such directory included in the downloaded release.tar.gz will be app, so install the app like this, replacing ~/Downloads/ with whatever directory you downloaded the file into:
cd ~/Downloads/
tar xzf nano-s-release.tar.gz
cd ledger-app-nervos-s
./install.sh app
The first thing that should come up in your terminal is a message that looks like this:
Generated random root public key : <long string of digits and letters>
Look at your Ledger device's screen and verify that the digits of that key match the digits you can see on your terminal. What you see on your Ledger hardware wallet's screen should be just the beginning and ending few characters of the longer string that printed in your terminal.
You will need to push confirmation buttons on your Ledger device a few times during the installation process and re-enter your PIN code near the end of the process. You should finally see the Nervos logo appear on the screen.
If you see the "Generated random root public key" message and then something that looks like this:
Traceback (most recent call last):
File "/usr/lib/python3.6/runpy.py", line 193, in _run_module_as_main
<...more file names...>
OSError: open failed
the most likely cause is that your udev rules are not set up correctly, or you did not unplug your Ledger hardware wallet between setting up the rules and attempting to install. Please confirm the correctness of your udev rules.
To load a new version of the Nervos application onto the Ledger device in the future, you can run the command again, and it will automatically remove any previously-loaded version.
You can install the Ledger app from source if you have Nix installed. To load the latest version of the Nervos app on a Ledger Nano S:
$ git clone https://github.com/obsidiansystems/ledger-app-nervos.git
$ cd ledger-app-nervos
$ git checkout master
$ ./nix/install.sh -t sThe steps for the X are the same, except for the last command:
$ ./nix/install.sh -t xSome notes during app installation:
- 'Starting bats': When building and installing the application from source, the client will run a suite of tests found in the
tests.shfile. 'bats' stands for "Bash Automated Testing System". These tests may take some time to complete. When they are done, the app installation will proceed. - Unsafe Manager: you will see a prompt to either allow or deny 'unsafe manager' when running
./nix/install.sh s. 'Unsafe Manager' is any manager which is not Ledger Live. - Permission Denied: If you get a “permission denied” error, your computer is not detecting the Ledger device correctly. Make sure the Ledger is connected properly, that it was plugged in since updating the
udevrules.
You have to accept a few prompts on the Ledger. Then you must select and load the Nervos app.
To confirm the version of the application installed on your hardware wallet, first make sure the Ledger device is:
- connected
- unlocked
- has the “Nervos” app open (shows “Use wallet to view accounts”)
Then run the following:
./check-installed-version.sh
If the results of that command match the results of git rev-parse --short HEAD, the installation was successful.
The Nervos Ledger app is built to work with CKB-CLI. Some of these CKB-CLI subcommands, such as account import, do not require that you're connected to a network such as the testnet Aggron or a devnet. Others, such as wallet transfer or DAO operations, must be submitted to a network for their result to be actualized. For testing purposes, we recommend Using the Nervos Devnet, but you can also Use the Nervos Testnet Aggron.
To use the CKB command line utility with the Ledger, you must currently use the Obsidian fork of the client. Note that Obsidian's fork of the client has a number of experimental features that do not currently exist upstream and, resultantly, should only be used for development and testing purposes.
To build and start it, run the following from within this repository:
$ nix run -f nix/dep/ckb-cli -c ckb-cliAll commands that follow prefixed with ‘CKB>’ should be run in the prompt provided by the above command.
It is also possible to install ckb-cli without nix. Should you choose to do so, please follow the upstream repo's instructions regarding the installation of dependencies
git clone https://github.com/obsidiansystems/ckb-cli.git
cd ckb-cli
git checkout ledger-app
cargo run
# To install
cargo install --path . -f
After installing the ckb-cli, install the Ledger plugin for ckb-cli by following the instructions on https://github.com/obsidiansystems/ckb-plugin-ledger/
Use the account list command to see connected Ledger devices. Be sure to have the Nervos application open on the device, otherwise it will not be detected:
CKB> account list
- "#": 0
account-id: 0x9c6e60f3e812ef5c859bbc900f427bffe63294c5490f93e4e50beb688c0798bf
source: "[plugin]: ledger_plugin"The account-id shown is the public key hash for the path m/44'/309', which is the root Nervos path. the account-id will be
used for <account-id> argument in the account import-from-plugin command as described below.
If you have already imported the Ledger account, then account list command will instead give the account details.
They will be shown even if the device is not connected.
CKB> account list
- "#": 0
address:
mainnet: ckb1qyqg64fqws0sdgrz2s7da2dzrlpq6plw9xcqhuexcr
testnet: ckt1qyqg64fqws0sdgrz2s7da2dzrlpq6plw9xcq2e8e5l
has_ckb_root: false
lock_arg: 0x8d5520741f06a062543cdea9a21fc20d07ee29b0
lock_hash: 0xe8e5dbae54d1ae5257ea55c1fbc210ef5521e0707b0d59bfb17e9f344ef96b7f
source: "[plugin]: ledger_plugin"Use the account import-from-plugin --account-id <account-id> command to import the account to the ckb-cli.
You will receive a confirmation prompt on the device which should say Import Account.
Confirm this to import the account. This operation will provide the extended public key of path m/44'/309'/0' to the ckb-cli.
CKB> account import-from-plugin --account-id 0x9c6e60f3e812ef5c859bbc900f427bffe63294c5490f93e4e50beb688c0798bf
address:
mainnet: ckb1qyqg64fqws0sdgrz2s7da2dzrlpq6plw9xcqhuexcr
testnet: ckt1qyqg64fqws0sdgrz2s7da2dzrlpq6plw9xcq2e8e5l
lock_arg: 0x8d5520741f06a062543cdea9a21fc20d07ee29b0Now that the account has been imported, it is remembered by the client and is visible when you run account list.
Use the account bip44-addresses command to obtain the first 20 receiving and 10 change addresses for your account.
CKB> account bip44-addresses --lock-arg <lock-arg>Note that this command is provided as a convenience by the ckb-cli to get a list of addresses with the derivation path quickly. Before sharing one of these receiving addresses, it is highly recommended that you verify the address provided by this command on the Ledger device using the account extended-address command as described next.
The account extended-address command should be used to
- Verify the public key obtained via
account bip44-addressescommand on the Ledger device - Obtain the public key for any arbitrary BIP44 derivation path
Here's an example command that provide the first receiving address for the lock-arg 0x327a95bd57966e686ffe590c331cd37002e1c631:
CKB> account extended-address --path "m/44'/309'/0'/0/1" --lock-arg 0x327a95bd57966e686ffe590c331cd37002e1c631This should show up on the ledger as 2 prompts:
| Prompt 1 | Prompt 2 |
|---|---|
Provide |
Address |
Public Key |
ckb1qyqxxtzygxvjwhgqklqlkedlqqwhp0rqjkvsqltkvh |
Verifying the output address printed by ckb-cli matches the one shown on Ledger prompt is highly recommended. Please read Ledger's documentation on the subject.
Note: If you've changed the app's configuration to show testnet addresses, the Address prompt will instead show the testnet address that begins with ckt. This setting persists between power cycles.
After accepting the prompt on the Ledger the output on ckb-cli will show information about the address:
address:
mainnet: ckb1qyqxxtzygxvjwhgqklqlkedlqqwhp0rqjkvsqltkvh
testnet: ckt1qyqxxtzygxvjwhgqklqlkedlqqwhp0rqjkvsa64fqt
lock_arg: 0x632c444199275d00b7c1fb65bf001d70bc609599
lock_hash: 0xee0283c2d991992d6e015a4680c54318ad42c820ca0dc862c0a1d68c415499a8
Basic transfers can be done using the wallet transfer command:
CKB> wallet transfer \
--from-account <lock-arg> \
--to-address <to-address> \
--capacity <capacity> \
--tx-fee <tx-fee>The on-device prompts for this command are as follows:
| Prompt 1 | Prompt 2 | Prompt 3 | Prompt 4 |
|---|---|---|---|
Confirm |
Amount |
Fee |
Destination |
Transaction |
<capacity> |
<tx-fee> |
<to-address> |
More complicated transactions, such as those with multiple outputs or inputs from different lock-args, can be constructed in a JSON file. We recommend the following resources for more complex transactions:
When doing more complex transactions, please note:
- Different transaction variants may have different on-device prompts so the user can verify all the aspects of what they are signing. To see each set of prompts that can occur during a transfer, see Prompts.md.
- There are restrictions you may encounter due to device constraints. For instance, The Nano S and Nano X cannot sign transactions with more than 5 non-change outputs in a single transaction when sending from a standard sighash address. When sending from a multisig address, the maximum number of outputs is 4.
Before or after a transaction, you may wish to verify the balance of an address. Do this with:
CKB> wallet get-capacity --address <address>
total: 100.0 (CKB)Get live cells:
CKB> wallet get-live-cells --address <address>
current_capacity: 2000.0 (CKB)
current_count: 1
live_cells:
- capacity: 2000.0 (CKB)
data_bytes: 0
index:
output_index: 0
tx_index: 2
lock_hash: 0x8cf5955c203e3bd9c0fa1ceac94206dca01e32a674ba17060e77f8e52750e491
mature: true
number: 460368
tx_hash: 0xe58df9496d58685516291bf3db0ccbdbc30a53a7316639676b7ad98020d13146
tx_index: 0
type_hashes: ~
total_capacity: 2000.0 (CKB)
total_count: 1Note that the following instructions reflect an anticipation of the future state of ckb-cli and are not all compatible with Obsidian's current ledger-app branch. For more instructions on using the ledger's message signing features with the ledger-app branch of ckb-cli see Experimental-ckb-cli.md
To sign the hash of a message with their ledger a user may do the following:
CKB> util sign-data --utf8-string "hello world i love nervos" --from-account <my-ledger-account>
message-hash: <blake2b hash of: magic_bytes + message>
recoverable: false
signature: <signature>If a message is longer than 64 characters the ledger will display the first 61 chars, followed by an ellipsis (...)
The ckb-cli accepts utf8 strings in its --utf8-string argument, but the ledger can not display all chars. If the ledger comes accross a
character that it is unnable to display it will display an asterisk (\*) instead.
Prompts on the Ledger device are as follows:
| Prompt 1 | Prompt 2 |
|---|---|
Sign |
Message |
Message |
<message> |
One can verfiy the signature as follows:
CKB> util verify-signature --message <message hash; labeled message above> --from-account <my-ledger-account> --signature <signature from above>
pubkey: <pubkey of my ledger's account root>
recoverable: <signature type>
verify-ok: trueA user can also choose to sign the hash of a message with an extended address, or with a recoverable signature ( these options are mutually inclusive):
CKB> util sign-data --utf8-string "hello world i love nervos" --from-account <my-ledger-account> --extended-address <address> --recoverable
message-hash: <blake2b hash of: magic_bytes + message>
recoverable: true
signature: <signature>A user may also switch out the --utf8-string option with a --binary-hex option, and the ledger will display
the message as hex, instead of ascii characters
CKB> util sign-data --binary-hex '0x61' --from-account <my-ledger-account>
The ledger also allows for the signing of a pre-hashed message. Due to the potential security risks of this option, a user must "opt-in" to this
setting by going into the Configuration section of the app, and setting Allow sign hash to On.
CKB> util sign-message --message <message hash> --from-account <my-ledger-account>
The ledger will display the following:
| Prompt 1 | Prompt 2 |
|---|---|
Sign |
Message |
Message Hash |
<message> |
If the length of the hash is greater than 64 bytes, or if the Allow sign hash is set to Off, the ledger will reject the message.
The user may also use the Sign Hash feature by selecting the --no-magic-bytes flag in a util sign-data command. If this is the case,
the client will hash the data for the user and send it to the ledger to sign.
You can deposit to the NervosDAO with the following command:
CKB> dao deposit \
--capacity <capacity> \
--from-account <lock-arg> \
--path <path> \
--tx-fee <tx-fee>Prompts on the Ledger device are as follows:
| Prompt 1 | Prompt 2 | Prompt 3 | Prompt 4 |
|---|---|---|---|
Confirm DAO |
Deposit Amount |
Fee |
Cell Owner |
Deposit |
<capacity> |
<tx-fee> |
<cell-owners-address> |
After you've made a deposit to the NervosDAO, you can confirm it using dao query-deposited-cells:
CKB> dao query-deposited-cells --address <address>
live_cells:
- capacity: 10200000000
data_bytes: 8
index:
output_index: 0
tx_index: 1
lock_hash: 0xa77a89c29289311b5d6a01f234facc8244cf455909260533e11183054852ff61
number: 472898
tx_hash: 0xc55bad328edd74c4be1e630d0eb52733d9ed027f02eaca10f0e78b96a44053fc
tx_index: 0
type_hashes:
- 0x82d76d1b75fe2fd9a27dfbaa65a039221a380d76c926f378d3f81cf3e7e13f2e
- 0xcc77c4deac05d68ab5b26828f0bf4565a8d73113d7bb7e92b8362b8a74e58e58
total_capacity: 10200000000Remember the values above for one of the live cells under tx_hash and output_index. You'll need these when constructing the dao prepare operation below which prepares a cell for withdrawal from the NervosDAO.
To prepare a cell for withdrawal from the NervosDAO:
CKB> dao prepare \
--from-account <lock-arg> \
--path <path> \
--out-point <tx_hash>-<output_index> \
--tx-fee <tx-fee>Prompts on the Ledger device are as follows:
| Prompt 1 | Prompt 2 | Prompt 3 | Prompt 4 |
|---|---|---|---|
Confirm DAO |
Deposit Amount |
Fee |
Cell Owner |
Prepare |
<capacity> |
<tx-fee> |
<cell-owners-address> |
After you've prepared your cell for withdrawal from the NervosDAO, you can confirm its status using dao-query-prepared-cells:
CKB> dao query-prepared-cells --address <address>
live_cells:
- capacity: 10500000000
data_bytes: 8
index:
output_index: 0
tx_index: 1
lock_hash: 0xa77a89c29289311b5d6a01f234facc8244cf455909260533e11183054852ff61
maximum_withdraw: 10500154580
number: 493786
tx_hash: 0xae91f2a310f2cfeada391e5f76d0addcc56d99c91a39734c292c930a1cfc67c2
tx_index: 0
type_hashes:
- 0x82d76d1b75fe2fd9a27dfbaa65a039221a380d76c926f378d3f81cf3e7e13f2e
- 0xcc77c4deac05d68ab5b26828f0bf4565a8d73113d7bb7e92b8362b8a74e58e58
total_maximum_withdraw: 10500154580Remember the values above for one of the live cells under tx_hash and output_index. You'll need these when constructing the withdraw operation below which withdraws CKB from the NervosDAO.
To withdraw a prepared cell from the NervosDAO:
CKB> dao withdraw \
--from-account <lock-arg> \
--path <path> \
--out-point <tx_hash>-<output_index> \
--tx-fee <tx-fee>Prompts on the Ledger device are as follows:
| Prompt 1 | Prompt 2 | Prompt 3 | Prompt 4 |
|---|---|---|---|
Confirm DAO |
Deposit Amount |
Compensation |
Cell Owner |
Withdraw |
<capacity> |
<return-capacity> |
<cell-owners-address> |
Compensation is the amount of CKB you have earned for having CKB deposited in the NervosDAO. It does not include the the original deposited amount. For more information about compensation, we recommend reading the Nervos DAO RFC.
If you attempt to withdraw from the Nervos DAO prematurely, you'll see an error such as
JSON-RPC 2.0 Error: Server error (Transaction: Immature)
or
JSON-RPC 2.0 Error: Server error (OutPoint: ImmatureHeader(Byte32(0xd7de1ffd49c71b5dc71fcbf1638bb72c8fb16f8fffdfd5172456a56167fea0a3)))
This means your prepared cell is not yet available to withdraw. You'll need to wait for the conclusion of your current deposit period before withdrawing.
Starting in version 0.5.0, the Nervos Ledger App can sign transactions with contract data. "Contract Data" is the part of a Nervos transaction which contains extra, unstructured data that is used by the Nervos-VM. It is also referred to as a "Custom Script," and is required for transactions using custom tokens such as those involving Simple User Defined Token (sUDT), Anyone Can Pay (ACP) and many other custom scripts. "Contract Data" is determined by a non-empty "cell data" field in a Nervos transaction.
By default, "Contract Data" is rejected by the Nervos Ledger App due to security concerns. Because this data is unstructured and diverse, the application cannot parse it into a verifiable prompts for the user to confirm.
Contract data can be enabled through the "Settings" menu and toggling "Allow Contract Data" from "off" to "on." You can verify your transaction has contract data by the "Contract Data: Present" prompt at the end of "Confirm Transaction". Since this data cannot be shown by the Nervos Ledger App beyond noting that it is either present or absent, you should enable the setting with caution, and attempt to verify the transaction cells elsewhere if possible.
If you run into issues building the Ledger application using nix-shell -A wallet.s --run 'make SHELL=sh all', we recommend trying nix-shell -A wallet.s --run 'make SHELL=sh clean all.
If you install any Ledger application outside of Ledger Live you will see the message "This app is not genuine" followed by an Indentifier when opening the app. This message is generated by the device firmware as a warning to the user whenever an application is installed outside Ledger Live. Ledger signs the applications available in Ledger Live to verify their authenticity, but the same applications available elsewhere, such as from this repo, are not signed by Ledger. As a result, the user is warned that the app is not "genuine", i.e. signed by Ledger. This helps protect users who may have accidentally downloaded an app from a malicious client without knowing it.
If an application is not listed in Ledger Live, it can only be uninstalled from the device over the command line similar to how it was installed.
To uninstall, follow the instructions for installing a release hex file up to the ledgerblue installation. You can then run python -m ledgerblue.deleteApp --targetId 0x31100004 --appName "<app-name>" to uninstall an application, replacing <app-name> with the name of the application you'd like to delete.
Note that side-loading applications on the Nano X is not supported with current firmware, thus applications can only be added or removed from a Nano X device through Ledger Live.