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Privacy BoostSunnyside Labs
About
A shielded pool for ERC-20 tokens on OP Mainnet, designed for institutional users. Provides TEE-backed privacy, balancing better UX with worse privacy trust assumptions.
Trusted Setups
Used in
Verifiers
Used in | Verifiers 5by |
Tech Stack
About
A shielded pool for ERC-20 tokens on OP Mainnet, designed for institutional users. Provides TEE-backed privacy, balancing better UX with worse privacy trust assumptions.
Privacy Boost uses Groth16 over BN254, with circuits written in Go against the gnark R1CS frontend. There is no recursive proof aggregation; batching happens inside each circuit.
There are five verifier families:
- Epoch: private transfers, withdrawals and gateway withdrawals; 13 reviewed configurations.
- Deposit epoch: standard deposit batches of 1, 4 or 14.
- Portal deposit epoch: hidden-recipient portal deposit batches of 1 or 6.
- Forced withdrawal: a permissionless delayed exit spending up to 13 notes, using a live auth key or spend approval checked at request time.
- Gift claim: private gift claims/refunds and public gift exits, with registered batch sizes 1 and 3.
For each of the verifier contracts, different configurations can be allowed with the according verifier keys. There are 21 verifier keys currently registered (13 epoch + 3 deposit + 2 portal + 1 forced withdrawal + 2 gift).
Privacy Boost v2
Detailed description
Circuit-specific trusted setup for the 21 Groth16 circuits of the Privacy Boost protocol over the BN254 curve, run by Sunnyside Labs and finalised on 2 September 2026. It replaces the first round whose 18 circuits were retired with the September 2026 upgrade. It reuses the first 80 contributions of the public Perpetual Powers of Tau ceremony as Phase 1. Phase 2 is a gnark-native MPC ceremony, the published manifest records 26 participants and 490 contributions in total, between 23 and 25 per circuit. Participants are identified by GitHub username.
- Phase 1 ceremony (first 80 contributions are used): https://github.com/privacy-ethereum/perpetualpowersoftau.
- Ceremony repository and contributor tooling: https://github.com/sunnyside-io/privacy-boost-ceremony
- Round record with the independently published bundle digests: rounds/2026-02.md
- Offline verification procedure: https://github.com/sunnyside-io/privacy-boost-ceremony/blob/main/PUBLIC_VERIFICATION.md
- Public verification bundle: https://file.ceremony.privacyboost.io/prod-20260902-public.tar
- Derived key bundle: https://file.ceremony.privacyboost.io/prod-20260902-keys.tar
List of different onchain verifiers for this proving system. Unique ID distinguishes differents deployments of the same verifier from different verifiers (e.g. different versions).
Consensys implementation of Groth16 proving system written in Go.
Verifier | Verification | Used in | Known deployments | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Privacy Boost epoch verifier, 13 circuits | by | | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Privacy Boost deposit verifier, 3 circuits | by | | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Privacy Boost forced withdrawal verifier, 1 circuit | by | | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Privacy Boost portal deposit verifier, 2 circuits | by | | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Privacy Boost gift claim verifier, 2 circuits | by | | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||