Tron

Tron offline signing via UR uses the same animated QR transport pattern.

Type Map

• Request UR: tron-sign-request
• Response UR: tron-signature

Tron helpers are provided by our QR wallet SDK and follow standard UR patterns.

Steps

1. Construct a Tron sign request (transaction/message + BIP-44 path)
2. Encode as UR and display as animated QR
3. Scan device response and decode signature
4. Broadcast to the Tron network

Samples

Build Tron sign request (UR)

import { TronSignRequest } from "@keystonehq/bc-ur-registry-tron";
import { CryptoKeypath, PathComponent } from "@keystonehq/bc-ur-registry";
import { airGapUrUtils } from "@keystonehq/keystone-sdk";

// path note: BIP44: m/44'/195'/0'/0/0
const keypath = new CryptoKeypath([
  new PathComponent({ index: 44, hardened: true }),
  new PathComponent({ index: 195, hardened: true }),
  new PathComponent({ index: 0, hardened: true }),
  new PathComponent({ index: 0, hardened: false }),
  new PathComponent({ index: 0, hardened: false }),
]);

const req = new TronSignRequest({
  signData: Buffer.from(rawTxHex, "hex"),
  derivationPath: keypath,
});

const ur = req.toUR();
const frames = airGapUrUtils.urToQrcode(ur);

Decode Tron signature (UR)

import { URDecoder } from "@ngraveio/bc-ur";
import { TronSignature } from "@keystonehq/bc-ur-registry-tron";

const dec = new URDecoder();
// pass every scanned frameString into dec.receivePart
if (dec.isComplete()) {
  const ur = dec.resultUR(); // expected UR type: 'tron-signature'
  const signatureData = TronSignature.fromCBOR(ur.cbor);
  const signature = signatureData.getSignature();
  // Note: broadcast signed transaction to Tron network
}