123

Pen Settings

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. If you need to use a different JavaScript preprocessor, remove the packages in the npm tab.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Use npm Packages

We can make npm packages available for you to use in your JavaScript. We use webpack to prepare them and make them available to import. We'll also process your JavaScript with Babel.

⚠️ This feature can only be used by logged in users.

Code Indentation

     

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

HTML Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              ### Interaction

<script src="https://cdn.cosmic.plus/ledger-wallet@1.x"></script>


<form>

<fieldset><legend>#account</legend>
  <input id="account" type="number" min="0" value="0" onchange="connect()">
</fieldset>

<fieldset><legend>#pubkey</legend>
  <input id="pubkey" type="text" disabled="true" placeholder="Waiting for Ledger wallet...">
</fieldset>

</form>
  

### Description

This pen makes use of `@cosmic-plus/ledger-wallet` to retrieve the public keys of Ledger wallet accounts.


### Keypoints

* `ledgerWallet` can connect to one account at once.
* It is not required to disconnect before changing the account number. `ledgerWallet.connect(account)` handles that in the background.
* Ledger browser libraries are only compatible with Google Chrome or browser based on it (Opera, Chromium, Brave,...).
* `@cosmic-plus/ledger-wallet` also supports Node.js environments.

### Challenges

- `[easy]` Edit that pen to Display the public keys of the 3 first accounts of the connected Ledger wallet.
- `[hard]` List all existing accounts after the BIP 44 definition − that is, until you find a series of 20 empty ones.

_Give it a try by forking that pen & editing the code!_

### Documentation

- [@cosmic-plus/ledger-wallet documentation](https://cosmic.plus/#view:js-ledger-wallet)
- <a href="https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki#address-gap-limit" target="_blank">BIP 44 gap limit proposal</a>

### Social

- [Discuss that pen on GalacticTalk](https://galactictalk.org/d/2080-pen-of-the-week-ledger-wallet-get-public-key)
            
          
!
            
              // $ npm install @cosmic-plus/ledger-wallet
// const ledgerWallet = require("@cosmic-plus/ledger-wallet")

const $ = document.querySelector.bind(document)

function connect () {
  $("#pubkey").value = null
  const account = $("#account").value
  ledgerWallet.connect(account)
}

ledgerWallet.onConnect = function () {
  $("#pubkey").value = ledgerWallet.publicKey
}

ledgerWallet.onDisconnect = connect

$("#account").onchange = connect
$("body").onload = connect

            
          
!
999px
🕑 One or more of the npm packages you are using needs to be built. You're the first person to ever need it! We're building it right now and your preview will start updating again when it's ready.

Console