ExternalWallets.md

External Wallets

Cast Wallet Integration

The Cast integration allows you to use Foundry's cast tool to sign transactions.

Available Options

The following configuration options are available for Cast wallet:

Option	Description
enabled	Flag to enable/disable Cast wallet usage
passwordFile	Path to a file containing the keystore password
keystore	Path to a keystore file or directory
mnemonicIndex	The index to use with a mnemonic (default: 0)
account	Account name when using the default keystore directory
interactive	Open an interactive prompt for entering private key

Usage

In your Hardhat config:

module.exports = {
  migrate: {
    castWallet: {
      enabled: true,
      passwordFile: "./password",
    }
  }
}

Or via command line:

npx hardhat migrate --network sepolia --castEnabled --passwordFile ./password

Trezor Hardware Wallet Integration

The Trezor integration allows signing transactions with a Trezor hardware wallet for enhanced security.

Available Options

Option	Description
enabled	Flag to enable/disable Trezor wallet usage
mnemonicIndex	Index for the account derivation path (default: 0)

Important Notes

• The integration uses the standard Ethereum derivation path: m/44'/60'/0'/0'/{index}
• Initial connection requires user interaction with the device to confirm access

Usage

In your Hardhat config:

module.exports = {
  migrate: {
    trezorWallet: {
      enabled: true,
      mnemonicIndex: 0
    }
  }
}

Or via command line:

npx hardhat migrate --network sepolia --trezorEnabled --trezorMnemonicIndex 5

Implementation Details

Cast Integration

• Uses Node.js child_process to execute cast commands
• Provides wrapped functions to interact with cast's wallet functionality
• Automatically handles command construction with appropriate flags

Trezor Integration

• Uses the official @trezor/connect library
• Provides initialization, address retrieval, and transaction signing