https://github.com/arcbtc/bowser-bitcoin-hardware-wallet

ESP32 Hardware Wallet
https://github.com/arcbtc/bowser-bitcoin-hardware-wallet

Last synced: 3 months ago
JSON representation

ESP32 Hardware Wallet

• Host: GitHub
• URL: https://github.com/arcbtc/bowser-bitcoin-hardware-wallet
• Owner: arcbtc
• License: mit
• Archived: true
• Created: 2020-06-01T14:04:26.000Z (about 4 years ago)
• Default Branch: master
• Last Pushed: 2022-12-17T16:33:52.000Z (over 1 year ago)
• Last Synced: 2024-03-20T15:30:49.989Z (4 months ago)
• Language: C
• Size: 485 KB
• Stars: 75
• Watchers: 9
• Forks: 20
• Open Issues: 5
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Lists

• awesome-BTC-embedded - Bowser Bitcoin hardware wallet

README

        
  

 ARCHIVED PLEASE SEE UPDATED VERSION HERE!!! 

  

  






BOWSER, DIY BITCOIN HARDWARE WALLET V1


> Join our telegram support/chat.

Building your own hardware wallet is a bit like building a lightsaber, only really necessary if you want to be a Jedi.

Now building hardware wallets is easy with the help of uBitcoin an Arduino library created by Stepan Snigirev.

Building hardware wallets not only gives greater autonomy/liberty, it is an excellent excuse to get a deeper understanding of how bitcoin keys, seeds and signing works.

For use with Electrum Wallet 3.3.8 https://download.electrum.org/3.3.8/ 

## Disclaimer/risk-profile

Project is out of beta and ready for use, but use at your own risk.

Its best to think of Bowser wallet like a cold storage paper wallet that can sign transactions. Some security is achieved by the passphrase being stored/verified as a hash, however the mnemonic is stored in an accessible location on the device and the passphrase could be brute forced, so the wallet details are only pseudo-secure on the device.

The risk/use profile of Bowser is storing in a secure location as you would with a paper wallet, the benefit of Bowser is it gives the option to sign transactions via PSBTs on an offline, dedicated device.

## Latest version

https://github.com/arcbtc/bowser-bitcoin-hardware-wallet/releases/tag/v1

## Tutorial

https://www.youtube.com/watch?v=DG1zrlAVdys

## SD COMMANDS

Commands to enter into bowser.txt on the SD card.

Wipe device completely, setup new wallet:


`HARD RESET`

Restore from a seed backup:


`RESTORE husband behind shallow promote....`

Sign an Electrum transaction:


`SIGN 45505446ff00020000000001016cb....`

## Morse-code cheat sheet



## Installing Arduino

Install Aruino IDE

https://www.arduino.cc/en/Guide/HomePage

Install ESP32 Boards

https://github.com/espressif/arduino-esp32/blob/master/docs/arduino-ide/boards_manager.md

## Libraries Used

- uBitcoin (Download library from github and "Add Zip Library" in Arduino Library Manager...Tested with v1.0.2)

- M5Stack (Install from "Library Manager" in Arduino)

- [lvgl](https://lvgl.io/) (Install from "Library Manager" in Arduino, search as "lvgl", appears in the list as "lv_arduino")

## Materials

- M5Stack (grey one is better)

- SD card (not sure if size is an issue for larger SD, 16GB works fine)