EVM Suite

Air-Gap signing support for Ethereum and EVM-compatible chains.

Account Setup

To obtain an ETH account, use CryptoHDKey to acquire the extended public key from the device.

Supported Operations

Operation	DataType	Demo description
EIP-1559 Transaction	typedTransaction (4)	Modern transaction format
Legacy Transaction	transaction (1)	Classic transaction format
EIP-712 TypedData	typedData (2)	Structured data signing
Personal Message	personalMessage (3)	Message signing

Steps

1. Build sign request using EthSignRequest
2. Encode as UR and display animated QR
3. Device scans, verifies, and signs offline
4. Decode response using EthSignature
5. Attach signature to transaction and broadcast

Fast Demo

import { KeystoneEthereumSDK } from "@keystonehq/keystone-sdk";

const eth = new KeystoneEthereumSDK();

// Build the sign request
const ur = eth.generateSignRequest({
  requestId: "uuid-string",
  signData: unsignedTxHex, // Hex string without 0x
  dataType: 4, // EIP-1559 type
  path: "m/44'/60'/0'/0/0",
  xfp: "12345678",
  chainId: 1,
  origin: "sample-client",
});

// Encode it and render the QR