@CoolWalletS/Wallet

This package is the starting point to interact with a CoolWalletS hardware.

Install

npm i @coolwallets/wallet

Quick Start

1. Keypair generation

For every APDU command, CoolWalletS will verify the identity of the requesting App by a digital signature, so we need to generate a key pair first for our new App.

You can use the generateKeyPair() function as follow.

import { generateKeyPair } from '@coolwallets/wallet'
const { publicKey: appPublicKey, privateKey: appPrivateKey } = generateKeyPair()

// store it locally on web storage
localStorage.setItem('appPublicKey', appPublicKey)
localStorage.setItem('appPrivateKey', appPrivateKey)

2. Device (App) Registration

After we have our keys ready, we need to register our App so the wallet can recognize us.

This can be done by the CoolWallet instance. In the constructor, we need to put in a Transport object for bluetooth transport, and the appPrivateKey we just generated to sign all the commands. Here's a example how to use web-ble-transport with CoolWallet

import WebBleTransport from '@coolwallets/transport-web-ble'
import CoolWallet from '@coolwallets/wallet'

const transport = new WebBleTransport();
const myCoolWalletS =  new CoolWallet(transport, appPrivateKey)

You may notice that there's one more optional field called appId in the constructor, we don't have it yet so we will ignore it, and we will put the value in later with setAppId after we get our own appId from register.

There're 3 parameters in the register method, appPublicKey, passwordand device_name. If this is the first app ever connect to your CoolWalletS, you can set whatever you want as password, the next app would need this password to register itself to the hardware.

*note: The password has to be a 8 digits number string.. The App Name can be whatever you want.

The register() function would return an unique appId, this is also something you have to save, and provide as contructor argument next time you want to create a CoolWallet instance as mentioned before.

myCoolWalletS.register(appPublicKey, '12345678', 'myFirstApp')
    .then( appId =>{
        localStorage.setItem("appId", appId)
        myCoolWalletS.setAppId(appId)
        console.log(`Store AppId complete! ${appId}`)
    })

A registered app can also called getPairingPassword() to generate a new random password and revoke the old one.

3. Create a Wallet

Now the card is paired but still empty. We can use createWallet to securely generate a new master seed with the card, or use setSeed to recover one from a hex seed.

myCoolWalletS.createWallet(12).then(_ => {
    // Sum all the seeds shown on CoolWalletS
    myCoolWalletS.sendCheckSum(873209).then( _ => {
        console.log(`Successfully create a new wallet!`)
    })
})

4. Your turn

Build your own App with our sdk!