Privacy infrastructure providers

Aztec is a privacy focused rollup (or zk-zk-rollup) on Ethereum that enables private transactions and programmable privacy. It is a fully programmable network where applications can access both private and public state.

Modular compliance layer built on the Chainlink Runtime Environment (CRE) to define, execute, and enforce identity- and policy-based controls for digital assets across public and private chains. Core onchain components (CCID, CCT Compliance Extension) pair with CRE services (Policy/Identity/Monitoring managers). Offchain policy execution returns signed approvals; onchain enforcement is required. PII/NPI remains offchain. It enables private transactions, with one of the main target use cases being CBDCs management.

Curvy is a smart-contract-/wallet-based privacy layer for ERC-20 transfers (and other tokens) on EVM chains. It introduces **stealth addresses**, **view keys**, and **one-time addresses per transaction** to break linkability of sender-recipient pairs, while preserving usability.

A production-ready Zero-Knowledge rollup for private token transfers with enterprise compliance features. Nightfall v4 implements a ZK rollup that provides immediate finality and supports ERC20, ERC721, ERC1155, and ERC3525 tokens with X509 certificate-based access control.

Fairblock provides confidential balances and transfers for assets (e.g., stablecoins) that remain issued and liquid on an originating chain (e.g., EVM networks), while confidentiality logic executes on **FairyRing**, a purpose-built confidentiality execution layer.

Fireblocks is a custody and infrastructure platform that provides secure wallet management and transaction workflows for institutions. In addition to custody and settlement rails, Fireblocks supports tokenization workflows, including issuing and managing tokenized bonds and other real-world assets for banks and asset managers.

Flashbots develops **MEV infrastructure** including private mempools, block building, and **SUAVE** (Single Unifying Auction for Value Expression) - a decentralized platform for private intent expression and execution.

Hinkal is a smart contract on public chains that lets users hold private balances controlled through their existing wallet keys. This enables users to send, receive and operate in stablecoins confidentially, without changing chains or custody. Through zero-knowledge proofs, every transaction is proven valid and verifiable on public chains, while participants and amounts stay private. Via viewing keys, users can selectively disclose transaction history to preserve auditability. And for compliance, Chainalysis KYT screens wallet addresses before execution to prevent high-risk funds from entering the smart contract.

iExec provides privacy-preserving computation, data governance, and trusted execution for decentralized applications through a decentralized network of **Trusted Execution Environments (TEEs)**.

Orion Finance enables **private, onchain portfolio management** by integrating **confidential smart contracts** powered by advanced cryptography (FHEVM). Managers can run **encrypted strategies**, protecting their alpha while keeping results auditable and verifiable onchain. The architecture preserves DeFi’s **composability and transparency** for users while adding **institutional-grade confidentiality** for asset managers.

Open-source (Apache-2.0) privacy layer under the [Linux Foundation Decentralized Trust](https://github.com/LFDT-Paladin/paladin). Paladin provides the common wallet/vault functions that are needed to interact with all forms of privacy preserving smart contracts. It also provides a model for atomic programmability across these privacy preserving smart contracts, harnessing the power of the underlying EVM shared ledger.

Peer (ex-ZKP2P) is an open-source protocol that enables peer-to-peer fiat-to-crypto swaps by proving fiat payments were completed on instant payment rails (Venmo, Revolut, and others). V3 uses a modular verification architecture: a TEE attestation service validates zk-TLS proofs offchain and emits EIP-712 payment attestations, which a Unified Payment Verifier contract checks onchain before releasing escrowed crypto.

Privacy Pools is a smart contract protocol that extends the mixer model by allowing users to prove that their withdrawals come from (or do not come from) deposits belonging to a specific **association set**. Instead of merely unlinking deposits and withdrawals, users can provide **membership** or **exclusion** proofs, enabling them to disassociate from illicit deposits while retaining privacy within compliant sets.

Fhenix builds a CoProcessor that brings Fully Homomorphic Encryption (FHE) to EVM chains, enabling developers to compute directly on encrypted data without ever decrypting it. This allows dApps to offer on-chain privacy by default. At its core, Fhenix introduces CoFHE, a decentralized coprocessor that makes encrypted computation fast, scalable, and easy for Solidity developers to adopt.

Railgun is a set of smart contracts providing **shielded transfers and private DeFi interactions** on Ethereum and other EVM-compatible chains. It uses zkSNARKs to maintain a UTXO-like note system (commitments and nullifiers) that allows users to send, receive, and interact with DeFi protocols while hiding wallet balances and transaction details.

Renegade is a decentralized dark pool protocol for trading digital assets. It combines **maliciously-secure MPC** (for private order matching) with **zkSNARK proofs** (for verifiable settlement), ensuring balances, orders, and trade history remain confidential while still settling on-chain.

Shutter Network provides **encrypted mempool** infrastructure that prevents MEV extraction and front-running by encrypting transactions until they are included in blocks, using **threshold cryptography** for decryption.

Soda Labs develops **open-source Garbled Circuit-based SMPC (Secure Multiparty Computation)** tools that enable confidential smart contracts and encrypted data processing directly on EVM-compatible networks. The Garbled Circuit–based confidential compute engine operates in two modes: integrated and plug-and-play. In the integrated mode, the MPC protocol is embedded within the consensus layer to produce a fully fledged, privacy-preserving L1 or L2. The plug-and-play mode, on the other hand, is run by an external network (called Bubble) to enable privacy on existing chains with minimal integration effort, while also supporting cross-chain functionality.

A SQL data oracle which is ZK-verifiable onchain. Space and Time allows smart contracts and API clients to run SQL queries over verifiably correct (attested), onchain events or signed, tamperproof offchain data and receive both: (a) the query result and (b) a zero-knowledge proof that the computation was performed correctly over untampered tables. The proof can be verified by an EVM-compatible verifier contract, enabling downstream smart contract logic to safely act on the result without trusting offchain execution or reprocessing data onchain.

TACEO Merces is an implementation of **Private Shared State (PSS)** for confidential stablecoin transfers on EVM chains. It combines multi-party computation (MPC) with zero-knowledge proofs (Groth16 via co-SNARKs) to hide transfer amounts while maintaining on-chain verification. Currently deployed on Base and Arc testnets.

TX-SHIELD builds modular privacy layers/solutions for institutional finance and AI systems: - **TX-SHIELD** — a regulated private payment layer/solution built on MPC-based encryption and threshold key control. It enables confidential settlement for stablecoins, RWAs, and bonds while ensuring regulator-auditable transparency. Transactions are visible only to stakeholders, while regulators can access details through granted audit keys.

Polygon Miden is a privacy focused Ethereum rollup (zk-zk-rollup) that prioritizes throughput and privacy over full EVM compatibility. It uses the Miden VM, a STARK-based virtual machine designed for client-side proving.

Zama develops **open-source FHE (Fully Homomorphic Encryption)** tools that enable confidential smart contracts and encrypted data processing directly on EVM-compatible networks.

An Ethereum-secured blockchain platform purpose-built for institutions that demand privacy, compliance, and full control of their data. Prividium is part of ZKsync's suite of enterprise solutions, designed for real-world asset tokenization, private capital markets, and institutional-grade financial infrastructure with selective disclosure capabilities.