npm package: @qtumproject/hdwallet-provider
Description: HD Wallet-enabled Web3 provider for QTUM
Author: Tim Coulter
Latest version: 2.0.9

# @truffle/hdwallet-provider

HD Wallet-enabled Web3 provider. Use it to sign transactions for addresses derived from a 12 or 24 word mnemonic.

## Install

```
$ npm install @qtumproject/hdwallet-provider
```

## Requirements

```
Node >= 12
Web3 ^1.2.0
```

## General Usage

You can use this provider wherever a Web3 provider is needed, not just in Truffle. For Truffle-specific usage, see next section.

By default, the `HDWalletProvider` will use the address of the first address that's generated from the mnemonic. If you pass in a specific index, it'll use that address instead.

### Instantiation

You can instantiate `hdwallet-provider` with options passed in an object with
named keys. You can specify the following options in your object:

Parameters:

| Parameter           | Type             | Default             | Required | Description                                                                                                                                                                                                            |
| ------------------- | ---------------- | ------------------- | -------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `mnemonic`          | `object\|string` | `null`              | [ ]      | Object containing `phrase` and `password` (optional) properties. `phrase` is a 12 word mnemonic string which addresses are created from. Alternately the value for mnemonic can be a string with your mnemonic phrase. |
| `privateKeys`       | `string[]`       | `null`              | [ ]      | Array containing 1 or more private keys.                                                                                                                                                                               |
| `providerOrUrl`     | `string\|object` | `null`              | [x]      | URI or Ethereum client to send all other non-transaction-related Web3 requests                                                                                                                                         |
| `addressIndex`      | `number`         | `0`                 | [ ]      | If specified, will tell the provider to manage the address at the index specified                                                                                                                                      |
| `numberOfAddresses` | `number`         | `1`                 | [ ]      | If specified, will create `numberOfAddresses` addresses when instantiated                                                                                                                                              |
| `shareNonce`        | `boolean`        | `true`              | [ ]      | If `false`, a new WalletProvider will track its own nonce-state                                                                                                                                                        |
| `derivationPath`    | `string`         | `"m/44'/60'/0'/0/"` | [ ]      | If specified, will tell the wallet engine what derivation path should use to derive addresses.                                                                                                                         |
| `pollingInterval`   | `number`         | `4000`              | [ ]      | If specified, will tell the wallet engine to use a custom interval when polling to track blocks. Specified in milliseconds.                                                                                            |
| `chainId`           | `number\|string` | `undefined`         | [ ]      | Specify to enable signed transactions that are EIP-155 compliant for major chains.                                                                                                                                     |

Some examples can be found below:

```javascript
const HDWalletProvider = require("@qtumproject/hdwallet-provider");
const Web3 = require("web3");
const mnemonicPhrase = "mountains supernatural bird..."; // 12 word mnemonic
let provider = new HDWalletProvider({
  mnemonic: {
    phrase: mnemonicPhrase
  },
  providerOrUrl: "http://localhost:8545"
});

// Or, alternatively pass in a zero-based address index.
provider = new HDWalletProvider({
  mnemonic: mnemonicPhrase,
  providerOrUrl: "http://localhost:8545",
  addressIndex: 5
});

// Or, use your own hierarchical derivation path
provider = new HDWalletProvider({
  mnemonic: mnemonicPhrase,
  providerOrUrl: "http://localhost:8545",
  numberOfAddresses: 1,
  shareNonce: true,
  derivationPath: "m/44'/137'/0'/0/"
});

// To make HDWallet less "chatty" over JSON-RPC,
// configure a higher value for the polling interval.
provider = new HDWalletProvider({
  mnemonic: {
    phrase: mnemonicPhrase
  },
  providerOrUrl: "http://localhost:8545",
  pollingInterval: 8000
});

// HDWalletProvider is compatible with Web3. Use it at Web3 constructor, just like any other Web3 Provider
const web3 = new Web3(provider);

// Or, if web3 is alreay initialized, you can call the 'setProvider' on web3, web3.eth, web3.shh and/or web3.bzz
web3.setProvider(provider);

// ...
// Write your code here.
// ...

// At termination, `provider.engine.stop()' should be called to finish the process elegantly.
provider.engine.stop();
```

**Note: If both mnemonic and private keys are provided, the mnemonic is used.**

### Using the legacy interface (deprecated)

The legacy interface is deprecated and it is recommended to pass options in an
object as detailed above. The following method of passing options is here
primarily to document the interface thoroughly and avoid confusion.

You can specify the following options in the order below.
Pass `undefined` if you want to omit a parameter.

Parameters:

| Parameter                | Type                | Default             | Required | Description                                                                                    |
| ------------------------ | ------------------- | ------------------- | -------- | ---------------------------------------------------------------------------------------------- |
| `mnemonic`/`privateKeys` | `string`/`string[]` | `null`              | [x]      | 12 word mnemonic which addresses are created from or array of private keys.                    |
| `providerOrUrl`          | `string\|object`    | `null`              | [x]      | URI or Ethereum client to send all other non-transaction-related Web3 requests                 |
| `addressIndex`           | `number`            | `0`                 | [ ]      | If specified, will tell the provider to manage the address at the index specified              |
| `numberOfAddresses`      | `number`            | `1`                 | [ ]      | If specified, will create `numberOfAddresses` addresses when instantiated                      |
| `shareNonce`             | `boolean`           | `true`              | [ ]      | If `false`, a new WalletProvider will track its own nonce-state                                |
| `derivationPath`         | `string`            | `"m/44'/60'/0'/0/"` | [ ]      | If specified, will tell the wallet engine what derivation path should use to derive addresses. |
| `chainId`                | `number\|string`    | `undefined`         | [ ]      | Specify to enable signed transactions that are EIP-155 compliant for major chains.             |

Instead of a mnemonic, you can alternatively provide a private key or array of
private keys as the first parameter. When providing an array, `addressIndex`
and `numberOfAddresses` are fully supported.

```javascript
const HDWalletProvider = require("@truffle/hdwallet-provider");
//load single private key as string
let provider = new HDWalletProvider(
  "3f841bf589fdf83a521e55d51afddc34fa65351161eead24f064855fc29c9580",
  "http://localhost:8545"
);

// Or, pass an array of private keys, and optionally use a certain subset of addresses
const privateKeys = [
  "3f841bf589fdf83a521e55d51afddc34fa65351161eead24f064855fc29c9580",
  "9549f39decea7b7504e15572b2c6a72766df0281cea22bd1a3bc87166b1ca290"
];
provider = new HDWalletProvider(privateKeys, "http://localhost:8545", 0, 2); //start at address_index 0 and load both addresses
```

**NOTE: This is just an example. NEVER hard code production/mainnet private
keys in your code or commit them to git. They should always be loaded from
environment variables or a secure secret management system.**

## Truffle Usage

You can easily use this within a Truffle configuration. For instance:

truffle-config.js

```javascript
const HDWalletProvider = require("@qtumproject/hdwallet-provider");

const mnemonicPhrase = "mountains supernatural bird ...";

module.exports = {
  networks: {
    development: {
      host: "localhost",
      port: 8545,
      network_id: "*" // Match any network id
    },
    ropsten: {
      // must be a thunk, otherwise truffle commands may hang in CI
      provider: () =>
        new HDWalletProvider({
          mnemonic: {
            phrase: mnemonicPhrase
          },
          providerOrUrl: "https://ropsten.infura.io/v3/YOUR-PROJECT-ID",
          numberOfAddresses: 1,
          shareNonce: true,
          derivationPath: "m/44'/1'/0'/0/"
        }),
      network_id: "3"
    }
  }
};
```