starkware-libs/starknet-privacy

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# Starknet Privacy Privacy pool protocol for Starknet. [![License: Apache2.0](https://img.shields.io/badge/License-Apache2.0-green.svg)](LICENSE) Users submit private transfers through the SDK, which compiles client actions and sends them to an operator-side proving service. The proving service executes these actions in virtual Starknet blocks and returns a validity proof together with proof facts back to the SDK. The SDK builds a transaction that the wallet submits (ideally via a paymaster to avoid leaking sender info) to Starknet. Starknet verifies the proof and provides validated proof facts to the pool contract via syscall. A discovery service indexes encrypted on-chain storage so wallets can efficiently sync their notes without scanning the full chain. ## Architecture ```mermaid graph LR subgraph Offchain Wallet([Wallet]) SDK[SDK] Discovery[Discovery] Proving[Proving] end subgraph Onchain Contract[Privacy Pool] Anonymizers[Invoke Anonymizers] end Wallet --> SDK SDK --> Discovery SDK --> Proving SDK --> Contract Discovery --> Contract Proving --> Contract Contract --> Anonymizers ``` - **SDK** — Orchestrates private transfers (register, transfer, discover) - **Discovery Service** — Indexes encrypted on-chain storage for efficient wallet sync - **Proving Service** — Executes actions in virtual Starknet blocks and returns validity proofs + proof facts to the SDK - **Privacy Pool Contract** — Source of truth for actions, storage layout, cryptography - **Invoke Anonymizers** — External contracts callable from within a private transaction (e.g. swap executors) ## Compatibility matrix All components in a row are tested together. Use matching revisions when deploying. | Component | Docs | Tag | | ------------------ | ------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | Transaction Prover | [README](https://github.com/starkware-libs/sequencer/tree/PRIVACY-0.14.4-RC.1/crates/starknet_transaction_prover) | [`ghcr.io/starkware-libs/starknet-privacy/transaction-prover:PRIVACY-0.14.4-RC.1`](https://github.com/starkware-libs/sequencer/pkgs/container/starknet-privacy%2Ftransaction-prover?tag=PRIVACY-0.14.4-RC.1) | | Proof Interceptor† | [README](proof-interceptor/README.md) | [`ghcr.io/starkware-libs/starknet-privacy/proof-interceptor:PRIVACY-0.14.4-RC.1`](https://github.com/starkware-libs/starknet-privacy/pkgs/container/starknet-privacy%2Fproof-interceptor) | | Discovery Service | [README](deploy/discovery-service/README.md) | [`ghcr.io/starkware-libs/starknet-privacy/discovery-service:PRIVACY-0.14.4-RC.1`](https://github.com/starkware-libs/starknet-privacy/pkgs/container/starknet-privacy%2Fdiscovery-service) | | Pathfinder\* | [docs](https://eqlabs.github.io/pathfinder/getting-started/running-pathfinder) | [`eqlabs/pathfinder:v0.22.7`](https://hub.docker.com/layers/eqlabs/pathfinder/v0.22.7/images/sha256-443ba8749c501f0dc5d8c8fbf03805ab7f3e9fc8ca8948f2e680005599a7f6a0) | | SDK | [README](sdk/README.md) | [`PRIVACY-0.14.4-RC.1`](https://github.com/starkware-libs/starknet-privacy/tree/PRIVACY-0.14.4-RC.1) | \* For the transaction prover to work correctly with Pathfinder, set `PATHFINDER_STORAGE_STATE_TRIES=10000`. † Optional deposit-screening sidecar to the transaction prover; deploy only for screening-enabled pools. ## Repository map | Directory | Description | | -------------------------------------------------------------------- | ------------------------------------------------------------------------------------- | | [`packages/privacy/`](packages/privacy/) | Cairo smart contract ([README](packages/privacy/README.md)) | | [`crates/discovery-core/`](crates/discovery-core/) | Core discovery logic & cryptography ([README](crates/discovery-core/README.md)) | | [`crates/discovery-service/`](crates/discovery-service/) | HTTP discovery service (RPC-backed) ([README](crates/discovery-service/README.md)) | | [`sdk/`](sdk/) | TypeScript SDK for private transfers ([README](sdk/README.md)) | | [`e2e/`](e2e/) | End-to-end tests & devnet fixture generation ([README](e2e/README.md)) | | [`deploy/discovery-service/`](deploy/discovery-service/) | Dockerfile & deployment ([README](deploy/discovery-service/README.md)) | | [`lean/`](lean/) | Formal verification (Lean) | | [`demo/`](demo/) | Web demo application | | [`scripts/`](scripts/) | Utility scripts (devnet, deployment, etc.) | | [`docs/`](docs/) | Audit reports & security docs ([audit](docs/audit/README.md)) | | [`crates/discovery-service/specs/`](crates/discovery-service/specs/) | Discovery service specifications ([README](crates/discovery-service/specs/README.md)) | ## Prerequisites ### Cairo Install [Scarb](https://docs.swmansion.com/scarb/) and [Starknet Foundry](https://foundry-rs.github.io/starknet-foundry/index.html) via [starkup](https://github.com/software-mansion/starkup): ```bash curl --proto '=https' --tlsv1.2 -sSf https://sh.starkup.dev | sh ``` ### Rust Stable toolchain. Install via [rustup](https://rustup.rs/) if needed. ### Node.js Version 20 or later. ### E2E tests See [e2e/README.md](e2e/README.md) for additional setup requirements (devnet, `.env` generation, built artifacts). ## Build and test ```bash scarb build && scarb test # Cairo contract cargo build && cargo test # Rust crates npm ci # npm workspace: sdk, client, proof-interceptor, e2e npm test -w sdk # TypeScript SDK npm test -w e2e # E2E ``` ## License [Apache 2.0](LICENSE) ## Audit Find the latest audit report in [docs/audit](docs/audit). ## Security For more information and to report security issues, please refer to the [security documentation](docs/SECURITY.md).

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