A Bitcoin Mneumonic generator for MstickC.

A simple dedicated device that can be used to generate a 12/24 word mneumonic offline. It uses the inbuilt hardware (6-axis IMU SH200Q) and to generate entropy.

Hardware

MstickC

Software

1. Visual Studio Code
2. PlatformIO extention for VSCode
3. Git

Build

• Checkout code

git clone https://github.com/prakashr1984/bitcoin-seed-generator.git
cd bitcoin-seed-generator

• Open the bitcoin-seed-generator folder in VS Code.
• PlatformIO: Build

Upload Firmware to MstickC

• Make sure you have the device connected via USB
• PlatformIO: Upload

Dependencies

This project uses M5StickC and uBitcoin library

Dependencies for this project are defined in platform.ini

lib_deps =
  https://github.com/m5stack/M5StickC.git#0.2.0
  https://github.com/micro-bitcoin/uBitcoin.git

Developer Guide

Please refer to the uBitcoin doc to learn about the API's available in the bitcoin library.

The main source code resides in src/ folder.

.
+-- src
|   +-- main.cpp
|   +-- Mnemonic.cpp
|   +-- Mnemonic.h

main.cpp - contains the bare minimum UI and code for seed generation. At present it uses the M5stick IMU library functions getAccelData , getGyroData to generate a randomness. It also uses getTempData to increase this randomness.

Mnemonic.cpp/.h - contains a custom logic for generating a random seed based on a sequence of float values (from any analog input pin of a device).

ToDo

• Imporve the UI
• Additinal tools
  • Generate Checksum word
  • Generate Recieve addresses based on xpub stored on the device.
  • Generate a series of 24 word Seeds from an existing Seed ?
  • More...