Practical overview
When it fits
Use this project when you need information about Keystone3 firmware features or are developing and building firmware for that specific hardware wallet.
Who it is for
- Keystone3 wallet users evaluating its documented firmware capabilities.
- Developers working on firmware for the Keystone3 device.
Documented uses
- Review firmware capabilities related to seed phrases, transaction signing and anti-tamper safeguards.
- Build the documented multi-coin or Bitcoin-only firmware target from the repository.
- Inspect or contribute to the C and Rust firmware codebase.
Requirements & limits
The repository is publicly accessible and described as open source. Its README provides macOS and Docker environment setup routes; it does not state a license in the supplied repository metadata.
- The firmware is designed specifically for the Keystone3 hardware wallet.
- The README documents Rust, C, FreeRTOS, the MH1903 MCU and three named secure elements.
- A precompiled MH1903 library is included because of intellectual-property restrictions.
- The README separates build instructions from firmware verification documentation.
Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.
Prepare the documented macOS build environment
Set up the repository and development dependencies for working on Keystone3 Firmware.
Before you start
- macOS
- Homebrew
- Rust installation instructions from rust-lang.org
Steps
Install the arm-none-eabi-gcc package using Homebrew, or follow the README’s stated Arm manual-installation route if Homebrew installation has issues.
Install Rust, then install the toolchain specified in rust-toolchain and add the thumbv7em-none-eabihf target.
Install bindgen-cli and cbindgen with Cargo.
Clone the repository, enter its directory and initialize submodules recursively using the command shown in the README.
Expected outcome
The repository and listed development dependencies are prepared; the README’s next stage is building the firmware.
Guide limitations
- This guide covers environment setup only, not a completed build or device installation.
- The README points to separate verification documentation; setup does not verify firmware.
Build a documented firmware target
Run the repository’s documented build script for multi-coin or Bitcoin-only firmware.
Before you start
- A prepared Keystone3 Firmware repository and build environment
- Python 3 for the multi-coin command; Python for the Bitcoin-only command
Steps
From the repository root, run python3 build.py for the multi-coin firmware.
For the Bitcoin-only target, run python build.py -t btc_only.
Expected outcome
The build script is invoked for the selected documented firmware target.
Guide limitations
- The README does not specify build outputs, hardware flashing steps or successful build results.
- Building is distinct from the verification process referenced in docs/verify.md.
Sources & review
Source record details
- Source availability
- Active
- Sources checked
- 16 October 2026
- Original website title
- KeystoneHQ/keystone3-firmware · Official homepage title · retained in its source language