Privacy Protocol
Privacy Protocol is a suite of privacy tooling for building confidential decentralized applications on EVM chains. It packages advanced cryptography — Zero-Knowledge proofs (Noir + UltraHonk) and Fully Homomorphic Encryption (Zama fhEVM) — into products you can adopt independently: reusable contracts, a proof oracle, and an anonymous-transactions SDK. Pick the layer that fits your app; no chain migration, no hand-rolled circuits.
The suite
| Product | What it is | Integrate via |
|---|---|---|
| Cipher | Privacy middleware toolkit — domain-specific adapters of reusable Solidity contracts (e.g. confidential DAO governance) you inherit and deploy | @privacy-protocol/cipher-contracts |
| Beacon | Modular zero-knowledge proof oracle — your contract verifies catalog proofs through one shared VerifierHub entrypoint, proving runs client-side | @privacy-protocol/beacon |
| Cloak SDK | Anonymous transactions for any dapp — a privacy-pools layer for private sends, withdrawals, and claims, with relayed gas sponsorship | @privacy-protocol/cloak |
Which product do I need?
- I want confidential app logic on-chain (encrypted ballots, private state, proof-gated actions) → start with Cipher and its adapters.
- I want my contract to verify a ZK predicate (“this caller is a member”) without writing a circuit → use Beacon.
- I want my users to transact without linking their address → integrate the Cloak SDK.
The products compose: a Cipher adapter can gate membership through the same proving stack Beacon curates, and Cloak keeps the transactions that drive either of them unlinkable.
Built on proven cryptography
| Foundation | Technology | Role |
|---|---|---|
| Zero-Knowledge proofs | Noir + UltraHonk | Validation, eligibility, and rule enforcement without revealing data |
| Fully Homomorphic Encryption | Zama fhEVM | Encrypted computation — operate on ciphertext without decrypting it |
Supported networks
- Sepolia testnet — available now
- Ethereum mainnet — coming soon
- L2 networks — planned
Next steps
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