Ledgstr - App

Concept

STILL IN PoC STAGE. Based on Ledger boilerplate, cleaning in progress.

Ledger application aiming to manage your Nostr key in a secure way.
Combined with the Chrome extension using NIP-07, you can use your favoti Nostr web client.

Ledger compatibility

• Ledger Nano S - USB - Tested
• Ledger Nano X - USB - Not tested

Limitations

Due to device memory limits, the app can only manage

Key principles

• Use BIP-44 & SLIP-44 for key generation (/44'/1237'/0'/0/0)

Roadmap

• Key generation, based on BIP-44 & SLIP-44
• Event signing with hash verification (optional)
• Direct message with NIP-04 (see limitations)
• Test with Ledger Nano X on USB
• Nano X bluethooth support
• Slax support

Technical notes

Build

sudo docker run --rm -ti -v "$(realpath .):/app" --user $(id -u $USER):$(id -g $USER) ghcr.io/ledgerhq/ledger-app-builder/ledger-app-builder:latest

make

Install

python3 -m ledgerblue.loadApp --curve secp256k1 --appFlags 0x000 --path "44'/1237'" --tlv --targetId 0x31100004 --targetVersion="2.1.0" --delete --fileName bin/app.hex --appName "Ledgstr" --appVersion "1.0.1" --dataSize $((0x`cat debug/app.map |grep _envram_data | tr -s ' ' | cut -f2 -d' '|cut -f2 -d'x'` - 0x`cat debug/app.map |grep _nvram_data | tr -s ' ' | cut -f2 -d' '|cut -f2 -d'x'`)) `ICONHEX=\`python3 /opt/nanos-secure-sdk/icon3.py --hexbitmaponly icons/nanos_app_boilerplate.gif  2>/dev/null\` ; [ ! -z "$ICONHEX" ] && echo "--icon $ICONHEX"` 

Contact

Vincent Bouzon - @vincent

Project Link: https://github.com/vbouzon/ledgstr-app

Acknowledgments

• Ledger boilerplate
• My wife for the beautiful logo and her eternal support.