@ledgerhq/hw-app-btc/lib-es/getAppAndVersion.js

Ledger Hardware Wallet Bitcoin Application API

import invariant from "invariant";
export const getAppAndVersion = async (transport) => {
    const r = await transport.send(0xb0, 0x01, 0x00, 0x00);
    let i = 0;
    const format = r[i++];
    invariant(format === 1, "getAppAndVersion: format not supported");
    const nameLength = r[i++];
    const name = r.slice(i, (i += nameLength)).toString("ascii");
    const versionLength = r[i++];
    const version = r.slice(i, (i += versionLength)).toString("ascii");
    const flagLength = r[i++];
    const flags = r.slice(i, (i += flagLength));
    return {
        name,
        version,
        flags,
    };
};
export const checkIsBtcLegacy = async (transport) => {
    try {
        // Call old btc API, it will throw an exception with new btc app. It is a workaround to differentiate new/old btc nano app
        await transport.send(0xe0, 0xc4, 0, 0);
    }
    catch (e) {
        return false;
    }
    return true;
};
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