Open Loud

A verifiable privacy L3 on Base, built on the OP Stack.
Privacy you can verify. Loud by design.

X @OpenLoudgg · openloud.org

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A verifiable privacy L3 on Base, built on the OP Stack. Open Loud ships in two profiles that share one cryptographic core:

• Full privacy chain — every transfer is a shielded UTXO note (Circom + PLONK). No trusted setup. Fully verifiable.
• Open L3 + Privacy Pool — a transparent EVM L3 with an opt-in, compliance-compatible Privacy Pool (fixed denomination + Association Sets, so withdrawals are "unlockable" by an Association Set Provider).

It runs locally with a single sequencer via Docker Compose and deploys to Base Sepolia / mainnet by swapping the settlement endpoint and keys.

Why PLONK, not Groth16?

Most privacy chains use Groth16 — a proving system that requires a trusted setup ceremony. If that ceremony is compromised, every privacy guarantee collapses.

Open Loud uses PLONK — a universal, trustless proving system:

	Open Loud (PLONK)	Others (Groth16)
Trusted setup	❌ None required	✅ Required
Ceremony risk	None	Single point of failure
Auditability	Full — verify yourself	Partial
Circuit upgrades	No new ceremony needed	New ceremony per circuit

If privacy is a right, the system protecting it should be open.

Layout

packages/
  circuits/     Circom circuits + PLONK prover (no trusted setup)
  contracts/    Hardhat: pools, verifiers, bridges
  sdk/          TypeScript: notes, Merkle tree, proof generation
infra/
  op-stack/     Docker Compose single-sequencer L3
  explorer/     Blockscout
apps/
  web/          Next.js UI (deposit / withdraw / verify)
docs/
  workflow.md         phased build plan
  architecture.md     system architecture & cryptographic core
  privacy-design.md   ZK circuit design & PLONK rationale

Quick start

pnpm install
pnpm setup    # compile circuits + deploy contracts
pnpm dev      # local chain + deploy + wallet backend

pnpm dev is the turn-key local stack: it starts a local node, deploys the privacy core, copies circuit artifacts into the web app, and runs the wallet backend. Then:

node apps/web/scripts/demo-deposit.mjs
curl http://localhost:3000/api/pool/leaves

Run the full verification gate directly:

pnpm --filter @loud/sdk test        # 9/9 passing
pnpm --filter @loud/circuits test   # 4/4 passing
pnpm contracts:test                 # 10/10 passing

Real L3 + explorer (Docker; chain boot is optional — see each README):

cd infra/op-stack && cp .env.example .env
cd infra/explorer && cp .env.example .env
docker compose up

Status: privacy core done & verified; full stack scaffolded & turn-key. See docs/workflow.md.

Security

⚠️ The setup shipped for development is single-contributor and must not secure real funds. Mainnet requires an external audit (Phase 6). See docs/privacy-design.md.