Privacy BoostSunnyside Labs

CircuitA program written for the purpose of being proven within a proving system. A circuit is a mathematical representation of the computation to be executed, arithmetic circuits and zkVM execution trace are examples of circuits. Circuits can be written in different languages, ranging from low-level to high-level.-specific trusted setupGeneration of a piece of data that must then be used for some cryptographic protocol to run. Generating this data requires some secret information. The "trust" comes from the fact the secret must be destroyed after the ceremony, otherwise cryptographic properties of the protocol could be broken. Once the data is generated, and the secrets are forgotten, no further participation from the creators of the ceremony is required. There are two types of trusted setups for SNARKs: (i) trusted setup per circuit where it is generated from scratch for each circuit, (ii) trusted universal setup per proving system where it can be used for several circuits. for 12 Groth16A zk-SNARK proving system introduced by Groth in 2016 that proves arithmetic circuits and requires a separate trusted setup for each circuit. It allows extremely efficient proof verification. circuits of the Privacy Boost protocol over the BN254 curve, run by Sunnyside Labs as its third production round (prod-ceremony-2026-03, release ceremony/v0.0.5). Its keys were registered onchain on 23 September 2026 and replace the second round keys of the epoch (9 shapes, down from 13), forced withdrawal and gift claim circuits, which were recompiled with gnark v0.16.3 after the EdDSA signature check was rewritten. The deposit and portal deposit circuits keep their second round keys. It reuses the first 80 contributions of the public Perpetual Powers of Tau ceremony (pot28_0080) as Phase 1For Groth16 trusted setup, phase 1 represents circuit-independent part of the trusted setup (e.g. Perpetual Powers of Tau), which could be reused across different circuits. It generates a part of the secret cryptographic data required for Groth16 ZK protocol to work. If the outcome of phase 1 trusted setup ceremony is known, arbitrary proofs could be forged.. Phase 2For Groth16 trusted setup, phase 2 represents circuit-dependent part of the trusted setup. It generates a part of the secret cryptographic data required for Groth16 ZK protocol to work. If the outcome of phase 2 trusted setup ceremony is known, arbitrary proofs could be forged. is a gnark-native MPC ceremony. At the time of writing, the round record still marks the round as in preparation, and neither the public verification bundle nor the bundle digests have been published, so the number of participants and contributions could not be checked.

• 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: rounds/2026-03.md
• Contributor release: ceremony/v0.0.5
• Offline verification procedure: https://github.com/sunnyside-io/privacy-boost-ceremony/blob/main/PUBLIC_VERIFICATION.md