Contact Details
Email: jupeng2015@gmail.com
Telegram: @ngjupeng
One liner: The private modular multisig platform for teams and SMBs to manage crypto across blockchains.
Summary
On-chain transparency presents a major barrier for crypto-native teams and SMBs handling sensitive financial operations like payroll, vendor payments, and treasury management. Meanwhile, blockchain fragmentation makes multi-chain asset control complex and inefficient.
Q3x solves this by offering a one-stop, privacy-first, modular multisig platform built natively on Aztec. Designed for DAOs, crypto-native teams, and SMBs entering Web3, Q3x enables users to manage assets across multiple blockchains from within Aztec, using customizable modules for their account. With Wormhole integration, users can interact with assets on chains like Arbitrum. With compliance and regulation in mind, Q3x provides users with privacy guarantees through one-click proofs of innocence.
This proposal focuses on deploying the multisig in Noir and enabling cross-chain control with Wormhole.
Timeline
Start date: Start within 3 days of grant confirmation.
End date: Target testnet deployment is within 1 month of project start, with a maximum delay of 1 week.
About Us
Name: Ng Ju Peng
Github: ngjupeng (JuPeng) · GitHub
Linkedin: https://www.linkedin.com/in/ngjupeng/
Summary: 3+ years of experience as blockchain developer and having bachelor degree in software engineering from Xiamen University. Winner of the Starknet Bengaluru Hacker House and founder of Q3x v1. Contributed to a fully on-chain mobile game on Starknet and served as a core contributor to scaffold-stark. Featured as a speaker at Starknet Basecamp and workshops. Also built an NFT game on Caldera and an Ethereum delegation staking platform that secured 100k+ TVL.
Name: Ken Nguyen
Github: KenNguyen-dev (kennguyendev) · GitHub
Linkedin: https://www.linkedin.com/in/ken-nguyen-0b998021a/
Summary: 4+ years of experience in building dApps and blockchain development as a full-stack developer, with experience building a crypto social network, non-custodial wallet and worked on eCash before. With strong Bitcoin background, including work on proving Bitcoin activity on Starknet, and EVM expertise with specialization in account abstraction.
Past works on Q3x:
Q3x is currently live on Starknet mainnet (deployed since March 24, 2025) with:
- 2000+ users
- 1200+ AI assistant interactions
With the following features:
- Transaction batching
- Recurring payment setup
- Multisig wallet deployment
- Wallet analysis
- Address book management
- Transaction history and wallet analysis export
- AI assistant for queries and automation
Related links:
Website: https://q3x.io/
GitHub:
Design: Figma Link
Demo Video:
(Some links are private, happy to share if requested!)
Q3x is currently collaborating with Miden to carry out private asset management on their testnet as well.
Technical Approach
Core Idea
Q3x enables teams and SMBs to manage assets across multiple blockchains from a single, private multisig account on Aztec. Leveraging Aztec’s native privacy and account abstraction, we implement a modular multisig contract (EIP7579 on EVM) in Noir, enhanced with cross-chain capabilities via the Wormhole protocol. Users interact entirely through Aztec, gaining privacy by default.
User Flow
- Multisig Setup: A team deploys a Q3x multisig contract on Aztec using Noir.
- Asset Control on Arbitrum: Users can initiate a transaction on Aztec (e.g. bridge funds, approve transfer) that triggers a Wormhole message.
- Message Relaying: The PXE proves the private transaction locally, which then enqueues a public call to dispatch a Wormhole-compatible VAA to Arbitrum.
- Execution on Arbitrum: The relayer submits the VAA to a Wormhole contract on Arbitrum, which verifies the message and executes the intended action.
Technical Considerations
- Privacy by Default: All signer approvals, asset ownership, and transaction data remain private in Aztec’s UTXO model using notes and nullifiers.
- Modular Design: Each Q3x account is a smart contract supporting pluggable modules (e.g.,timelocks, spending limit), all written in Noir
- Wormhole Compatibility: We’ll use Wormhole’s bridge and message passing architecture to interact with Arbitrum
This architecture ensures that users maintain full privacy within Aztec while securely controlling and interacting with assets on external chains like Arbitrum.
Grant Amount Requested
$5,000
Budget Rationale:
Estimated duration: 1 month
FTE: 2
Costs: 5,000 USD
| Number | Deliverable | Detail |
|---|---|---|
| 1a. | Multisig Contract written in Noir | Implement the core private multisig logic using Noir on Aztec. |
| 1b. | Integration of wormhole bridge to Arbitrum | Control assets on Arbitrum via a private multisig on Aztec |
Budget Breakdown
| Category | Item | Cost | Amount | Description |
|---|---|---|---|---|
| Personell (Ju Peng) | Full-Stack Developer | 2,500 USD | 1 FTE | Leading developer |
| Personel (Ken) | Full-Stack Developer | 2,500 USD | 1 FTE | developer |
| Total: 5,000 USD | 2 FTE |
Additional Information
Business plan including Total Addressable Market (TAM), Serviceable Available Market (SAM), Serviceable Obtainable Market (SOM), financial projections, and competitor analysis: Q3x Business Plan_ Aztec_Privacy_Asset_Management.docx - Google Docs
Future plan:
-
Expand Cross-Chain Support: Extend Q3x’s interoperability to more L2s beyond Arbitrum, enabling broader asset control from Aztec.
-
Local-First CLI Tool: Launch a CLI that allows users to spin up the Q3x interface locally with full functionality, eliminating reliance on a centralized frontend and reducing UI exploit risks.
-
Modular Feature Expansion: Deliver additional plug-and-play modules (e.g. timelocks, spending limits, automated triggers) to support more flexible treasury workflows.
-
Compliant Privacy Toolkit: Integrate one-click “Proof of Innocence” features to enable users to demonstrate regulatory compliance without revealing sensitive transaction details.