BTC

Step 1. Install and setup

• Ensure camera streaming to feed animated QR frames to the decoder.

Step 2. Decode an incoming animated QR

import { airGapUrUtils } from '@keystonehq/keystone-sdk';
const { receivePart, promiseResultUR } = airGapUrUtils.createAnimatedURDecoder();
receivePart?.(frameString);
const ur = await promiseResultUR; // a complete UR object

Step 3. Build a PSBT request

• Produce an unsigned PSBT (hex/base64) from your wallet backend.

• Encode as a UR for display as animated QR frames (type: crypto-psbt).

// Pseudocode: convert PSBT → UR → animated QR frames
// const ur = airGapUrUtils.psbtToUR(unsignedPsbt);
// const frames = airGapUrUtils.urToQrcode(ur);

Reference: Basic API

Step 4. Scan device response

• Decode the device response (also crypto-psbt) using the same decoder.

• Extract the signed PSBT and finalize/broadcast via your backend.

Step 5. Submit/broadcast

Submit the finalized transaction to the network.