blog/source/docs/blockchain_accounts_configuration.md

title: Accounts Blockchain configuration layout: docs

In our guide on configuring a blockchain client, we've configured accounts in several places.

This parameter let's us customize what the accounts will be for our deployment, as well as the accounts that will be created and unlocked by our blockchain client.

Accounts parameters

accounts: [
  {
    nodeAccounts: true,
    numAddresses: "1",
    password: "config/development/devpassword"
  },
  {
    privateKey: process.env.MyPrivateKey
  },
  {
    privateKeyFile: "path/to/file",
    password: process.env.MyKeyStorePassword
  },
  {
    mnemonic: process.env.My12WordsMnemonic,
    addressIndex: "0",
    numAddresses: "1",
    hdpath: "m/44'/60'/0'/0/"
  }
]

The accounts configuration is an array of objects, where each object represents one or more account.

Embark offers you multiple ways to include your account. You can use the one you prefer and ignore the others or mix and match.

{% notification danger 'Using production keys' %} Be careful when using production keys and mnemonics (ie the account where you have real money).

We recommend using environment variables for plain text values like privateKey and mnemonic and to put the files for privateKeyFile and key stores either out of your working directory or ignored by versioning (eg: add the file in gitignore) {% endnotification %}

Parameter descriptions

• nodeAccounts: The actual node accounts, that get created and unlocked by the client
  • Can be enabled by setting it to true
  • numAddresses: Number of addresses you want from the node. Defaults to 1
  • password: Password file where the password to create and unlock the accounts is. This is required
• privateKey: Private key string
• privateKeyFile: Either a file containing comma separated private keys or a keystore (password needed for the latter). This can also be set to random to generate a random account (useful when testing)
  • password: Password string for the keystore
• mnemonic: 12 word mnemonic
  • addressIndex: Index where to start getting the addresses. Defaults to 0
  • numAddresses: Number of addresses to get. Defaults to 1
  • hdpath: HD derivation path. Defaults to "m/44'/60'/0'/0/"

{% notification info 'Accounts order' %} The order in the accounts array is important. This means that using nodeAccounts first, as above, will set the node's account as the defaultAccount for deployment. {% endnotification %}

Configuring account balance for development

When in development, we can specify the balance of each account using the balance option:

module.exports = {
  development: {
      deployment: {
        accounts: [
          {
            mnemonic: "12 word mnemonic",
            balance: "5 ether"
          }
        ]
      }
  }
}

Balances can be specified using human readable units such as "5 ether" or "200 finney". If no unit is specified the value will be in Wei.