Ethereum Privacy by H33

Compliant Privacy for Ethereum.

Name: Ethereum Privacy by H33
Brand: H33

Tornado Cash failed because it had no compliance layer. H33 provides one.

The Ethereum ecosystem learned the wrong lesson from Tornado Cash. The lesson was not that privacy is illegal. The lesson was that privacy without a compliance layer is a regulatory death sentence. H33 provides the compliance layer that Tornado Cash never had.

Schedule Demo Privacy Layer Hub

The Lesson

Privacy without compliance is a regulatory death sentence.

On August 8, 2022, OFAC sanctioned Tornado Cash. The protocol was privacy-only -- it could not distinguish between a sanctioned entity and a compliant user. It had no mechanism for regulators to verify that a transaction was lawful without revealing the transaction itself. The result was a blanket prohibition that froze the entire protocol and led to criminal charges against its developers.

Tornado Cash Model

Privacy without compliance

No KYC attestation. No sanctions screening. No mechanism for regulator verification. The protocol could not prove that any individual transaction was compliant. OFAC sanctioned the entire contract.

Traditional KYC Model

Compliance without privacy

Collect passports, SSNs, addresses. Build a PII database. Become a breach target. Pay for SOC 2. Hire a DPO. When the database leaks, face class-action litigation.

The Third Option

Verify compliance cryptographically. Never possess user data.

A STARK proof demonstrates that a user satisfies compliance requirements -- KYC passed, not sanctioned, accredited, jurisdictionally eligible -- without transmitting the underlying personal data. The protocol receives a 32-byte commitment. The regulator can independently verify the attestation via the public HATS verifier. The user's documents, identity, and financial data never leave their control.

Cross-Layer

Works across Ethereum L1 and all L2s.

The same 32-byte commitment anchors on Ethereum mainnet, Arbitrum, Base, Optimism, zkSync, Polygon, Scroll, or any EVM chain. The commitment is stored in calldata or contract storage. The full proof lives in Cachee. One attestation works everywhere.

                
                H33Verifier.sol
            
// One function call to verify attestation
function deposit(uint256 amount, bytes32 attestation) external {
    // Check attestation exists and is not expired
    require(
        IH33Verifier(verifier).isValid(msg.sender, attestation),
        "H33: attestation invalid or expired"
    );

    // Depositor is verified. Protocol never saw their documents.
    // Full proof retrievable from Cachee for audit.
    _deposit(msg.sender, amount);
}

Same contract interface on every EVM chain. Deploy once. Verify everywhere.

DeFi Compliance

Per-transaction attestation without PII.

Every DeFi transaction can carry a compliance attestation -- proving the participant satisfies regulatory requirements without the protocol ever seeing, storing, or transmitting personal data. This is not theoretical. The attestation is a 32-byte on-chain commitment backed by a full STARK proof and three post-quantum signatures via H33-74.

Lending Protocols

Verify borrower identity and jurisdiction without collecting PII. Prove collateral sufficiency without revealing portfolio composition. Attestations expire and auto-refresh on compliance cadences.

DEX Trading

Per-swap compliance attestation. Prove the trader is not sanctioned, is KYC-verified, and is eligible in their jurisdiction -- all without the DEX seeing a single identity document.

Stablecoin Issuance

Mint/redeem with compliance proofs. Prove reserves, prove holder eligibility, prove sanctions screening -- all cryptographically. No PII custody required for the issuer.

Yield Vaults

Institutional yield vaults require accredited investor verification. H33 proves accreditation status for 12 months per SEC guidance without the vault ever seeing net worth documentation.

Post-Quantum Advantage

Every Ethereum ZK project uses quantum-vulnerable cryptography.

zkSync, Polygon zkEVM, Scroll, and every other ZK rollup on Ethereum relies on PLONK or Groth16 with KZG polynomial commitments on the BN254 elliptic curve. These are efficient. They are also quantum-vulnerable. When a cryptographically relevant quantum computer exists, the security of every proof generated by these systems becomes zero. H33 uses STARKs with hash-based commitments. No elliptic curves. No pairings. No quantum expiration.

Ethereum ZK System	Proof System	Quantum Status
zkSync Era	PLONK + KZG on BN254	Vulnerable
Polygon zkEVM	PLONK + FRI/KZG on BN254	Vulnerable
Scroll	PLONK + KZG on BN254	Vulnerable
Aztec	Honk + KZG on BN254	Vulnerable
Tornado Cash	Groth16 on BN254	Vulnerable
H33 Privacy Layer	STARK + SHA3-256	Post-Quantum

Read more: Post-Quantum Privacy -- the complete analysis of quantum vulnerability across all blockchain privacy systems.

Privacy that regulators can verify.

The Tornado Cash lesson applied correctly. Privacy and compliance are not in tension. H33 proves both simultaneously.

Schedule Demo

H33.ai, Inc. · Patents Pending · HATS Standard · Privacy Layer · H33-74