> For the complete documentation index, see [llms.txt](https://docs.viide.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.viide.io/technology/par-system.md).

# PAR System

Privacy-preserving Advertisement Recommendation

Viide adopts Secure Multi-party Computation to protect the security and privacy of users.

Blockchain-based Zero-Knowledge Proofs.

Flexible and efficient Federated Learning.

![](https://3482422270-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fi8MBRipMlLMBFqfpvytg%2Fuploads%2F5Guyi8QDeyAj2WEMn5BJ%2Fimage.png?alt=media\&token=324f4aac-e749-478c-b68c-282e9dc7fcf6)