> **Key takeaway:**  ☞   The renaming of "Ledger Live" to "Ledger Wallet" and\
>      "wallet" (in the hardware sense) to "signer" is still in progress.\
>      This page may contain legacy references that will be updated.

# Using the Bitcoin Module in Wallet API Core Client

The Bitcoin Module allows you to interact with Bitcoin accounts. Specifically, you can retrieve the extended public key (xPub) of a Bitcoin account. This is useful for deriving Bitcoin addresses without revealing the private key.

## Bitcoin Module Overview

Access the Bitcoin module via `walletApiClient.bitcoin`.

### Methods:

#### 1. Get Extended Public Key (xPub)

Retrieve the extended public key (xPub) of a Bitcoin account. The xPub can be used to derive Bitcoin addresses without exposing the private key.

```javascript
walletApiClient.bitcoin.getXPub(accountId: string): Promise<string>
```

**Parameters**:

- `accountId` (required): The ID of the Bitcoin account for which the xPub is to be retrieved.

**Returns**: A promise that resolves with the xPub as a string.

[**Required permission**:](https://developers.ledger.com/docs/ledger-live/discover/guides/wallet-api/appendix/manifest#permissions)
`bitcoin.getXPub`

##### Example:

```javascript
async function getXPub(walletApiClient, accountId) {
  try {
    const xPub = await walletApiClient.bitcoin.getXPub(accountId);
    console.log("Extended Public Key (xPub):", xPub);
  } catch (error) {
    console.error("Error retrieving xPub:", error);
  }
}
```

## Handling Errors

Make sure to handle errors gracefully and provide appropriate feedback to the user. Additionally, always remember to disconnect the `WindowMessageTransport` when you're done interacting with the  API to free up resources.