Air-Gap (Offline QR Signing)

Build a “device stays offline” signing loop using UR-encoded QR codes.

How it Works

1. Build Request: Create a sign request UR payload (per chain), render as animated QR frames
2. Device Scans: Device scans QR, verifies details on-screen, signs offline
3. Get Signature: Device displays signature UR as animated QR
4. Broadcast: App scans response, verifies, and broadcasts via your network

Quick Start by Chain

API Reference

• Basic API – Core UR types: CryptoHDKey, CryptoCoinInfo, CryptoKeypath

Packages

# Keystone SDK & UR registries
npm install @keystonehq/keystone-sdk @keystonehq/bc-ur-registry-eth
 
# UR primitives
npm install @ngraveio/bc-ur

Demo & Examples

• React Native Demo: GitHub Air-Gap Demo 
  • Scanner: AirGapScanner.tsx 
  • Chain helpers: sdk/ 

Note: Air-Gap is offline by design. There is no online browser playground.