> For the complete documentation index, see [llms.txt](https://whitepaper.opz.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://whitepaper.opz.io/opz-app/security/mpc-2fa-signing.md).

# MPC-2FA Signing

### 2FA Protection for Every MPC Transaction

* In the OPZ app, users can enable Two-Factor Authentication (2FA) specifically for Multi-Party Computation (MPC) transactions and signing actions. This feature adds an extra layer of verification, protecting against unauthorized or fraudulent activities.

This is particularly important in the context of MPC, where multiple parties are involved in the signing process. The 2FA requirement ensures that the user authenticates each transaction or signing.

### Enabling Two-Factor Authentication (2FA) in the OPZ App

1. **Navigate to App Preferences:**
   * In the app's main interface, tap on the avatar icon (👤) to open the app's main menu.
   * From the menu list, select "App Preferences."
2. **Access Security Settings:**
   * Look for the "Security Protection" section in the App Preferences menu.
   * Tap on “Security Protection” to access your account's security settings.
3. **Enable 2FA for Transactions/Signings:**
   * Inside the Security Protection settings, find the option labeled “Enable 2FA Transaction/Signing.”
   * Tap on the checkbox option to activate 2FA.
   * If prompted, follow any additional steps to verify or confirm your choice.


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