1. Use watermark: add watermark to the QR code, such as company name and campaign slogan, to prevent others from tampering and embezzlement.

2. Encryption: The QR code is encrypted, and only the participants can get the real lottery information after scanning, which can enhance the security of the QR code.

3. Limit the collection times: Set the collection times or effective time of each QR code to avoid malicious code brushing and unlimited embezzlement.

4. Multi-channel publishing: Publish the QR code to multiple platforms or media to improve the difficulty of misappropriation.