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# Security Reviews

Third-party audits of Lethean's cryptographic protocols. The research papers themselves are in [Whitepapers](/docs/learn/whitepaper).

### Zarcanum review by [Cypher Stack](https://cypherstack.com/)

Review of the [Zarcanum](/docs/learn/lethean-features/overview#zarcanum-anonymous-proof-of-stake) Proof of Stake scheme with hidden amounts.

https://github.com/cypherstack/zarcanum-review/releases/tag/final

### Lethean d/v-CLSAG review by [Cypher Stack](https://cypherstack.com/)

Review of Lethean's ring signature scheme used for [untraceable transactions](/docs/learn/lethean-features/overview#untraceable-transactions).

https://github.com/cypherstack/lethean-clsag-review/releases/tag/final

