# Introduction OPZ-NFC

**What is OPZ-NFC?**

OPZ-NFC is a new, easy way to keep your crypto keys offline while still being able to access your crypto assets with a simple tap. It uses Near Field Communication (NFC) technology to store your encrypted keys offline. 

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**Key Features of OPZ-NFC**

1. **Offline Key Storage**: OPZ-NFC allows users to store their cryptographic keys on any NFC device. By storing keys offline and using encryption, OPZ-NFC significantly lowers the risk of online threats such as hacking.
2. **Tap-to-Access Functionality**: For transactions or accessing web3 applications, users can simply tap their NFC device against their phone. This feature brings ease and speed to the process, making it user-friendly.
3. **Encrypted Key Protection**: The cryptographic keys stored on the NFC device are encrypted, ensuring high-level security. The encryption safeguards the keys, rendering them unusable if the NFC device is misplaced or stolen.
4. **Integration with OPZ Account Security**: The NFC device works with the user’s OPZ account, which is secured by a password and multi-factor authentication. This dual-layer security ensures that the keys are not only stored safely but also accessed securely.

**Conclusion**

The OPZ-NFC Card enables users to store their MPC keys securely and interact with the OPZ Wallet and Web3 browser with just a simple tap. By providing a tangible way to interact with digital assets, it brings a new dimension to the crypto experience.

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## Devices:

OPZ-NFC is adaptable, working with a wide range of devices:

* OPZ Basic & Steel Card

{% content-ref url="opz-card" %}
[opz-card](https://whitepaper.opz.io/opz-nfc/opz-card)
{% endcontent-ref %}

* Store your encrypted MPC key to any NFC device, including smart rings, watches, NFC tags/stickers, pens, and more...