rs-soroban-ultrahonk

Soroban contract wrapper around the Noir(UltraHonk) verifier. The VK is set at deploy time; proofs are verified with public_inputs and proof.

Quickstart (localnet)

Prereqs:

• stellar CLI (stellar-cli)
• Rust + wasm32v1-none target
• Docker (for localnet)

# 1) Start localnet
stellar container start -t future --name local --limits unlimited

# 2) Configure network + identity
stellar network add local \
  --rpc-url http://localhost:8000/soroban/rpc \
  --network-passphrase "Standalone Network ; February 2017"
stellar network use local
stellar network health --output json
stellar keys generate --global alice
stellar keys fund alice --network local
stellar keys address alice

# 3) Build + deploy (constructor requires a VK from tests/build_circuits.sh)
rustup target add wasm32v1-none
stellar contract build
stellar contract deploy \
  --wasm target/wasm32v1-none/release/rs_soroban_ultrahonk.wasm \
  --source alice \
  -- \
  --vk_bytes-file-path tests/simple_circuit/target/vk

Invoke verify_proof

Build ZK artifacts (vk/proof/public_inputs)

From the repo root. You need Noir tooling (nargo) and bb (barretenberg). Artifacts are generated with --oracle_hash keccak.

tests/build_circuits.sh

Use the helper script

Expects a dataset folder with public_inputs, proof (the VK is already on-chain from deploy):

cd scripts/invoke_ultrahonk
npm install
npx ts-node invoke_ultrahonk.ts invoke \
  --dataset ../../tests/simple_circuit/target \
  --contract-id <CONTRACT_ID> \
  --network local \
  --source-account alice \
  --send yes

Direct CLI invoke

stellar contract invoke \
  --id <CONTRACT_ID> \
  --source alice \
  --network local \
  --send yes \
  --cost \
  -- \
  verify_proof \
  --public_inputs-file-path tests/simple_circuit/target/public_inputs \
  --proof_bytes-file-path tests/simple_circuit/target/proof

VK policy (important)

This contract does not enforce access control:

• __constructor stores the VK once at deploy time (immutable after first set).
• verify_proof always uses the stored VK set at deploy.

Tests

RUST_TEST_THREADS=1 cargo test --test integration_tests -- --nocapture
cargo test --manifest-path tornado_classic/contracts/Cargo.toml --features testutils -- --nocapture

References

• Noir language: https://noir-lang.org/
• Barretenberg (bb): https://github.com/AztecProtocol/aztec-packages
• rs-soroban-ultrahonk: https://github.com/yugocabrio/rs-soroban-ultrahonk
• Soroban documentation: https://developers.stellar.org/docs/build/smart-contracts
• Soroban SDK (Rust): https://github.com/stellar/rs-soroban-sdk

Audit status

This project has not been audited.

License

MIT