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 uses the ppot_0080 files from the public Perpetual Powers of Tau ceremony 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.. These contain 61 participant contributions and one public randomness beacon. Contribution 0078 resumes from 0058 after a fork, so the included IDs are 0001–0058 and 0078–0080, rather than the first 80 contributions. 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 finalized on 23 September 2026. The published round record reports 16 participants and 192 accepted contributions, 16 per circuit. Participants are identified by GitHub username, and four of them show a Sunnyside Labs affiliation there. The coordinator served plain HTTP and contributions carry no signatures, so participant names rest on the coordinator’s records. The public verification bundle, published on 29 October 2026, re-derives every registered key from these contributions.

• Phase 1 ceremony and fork: https://github.com/privacy-ethereum/perpetualpowersoftau/blob/b077232729db7c9eb65b63c4aaaa0ac4a1b0bba2/README.md#note-on-chain-fork.
• Ceremony repository and contributor tooling: https://github.com/sunnyside-io/privacy-boost-ceremony
• Round record with the published counts and bundle digests: rounds/2026-03.md
• Contributor release: ceremony/v0.0.5
• Offline verification procedure: PUBLIC_VERIFICATION.md
• Public verification bundle: https://file.ceremony.privacyboost.io/prod-20260923-public.tar.gz
• Derived key bundle: https://file.ceremony.privacyboost.io/prod-20260923-keys.tar.gz