ShadowPay
ShadowPay is a privacy-focused payroll platform that enables private payroll flows on-chain
Demo
About
Employers can run monthly payroll seamlessly while leveraging [Unlink](https://unlink.xyz) to keep salaries private. Employees receive their payments in shielded balances, ensuring that each person’s exact compensation remains confidential. Zero-knowledge proofs allow full access and withdrawal of funds without revealing individual salaries, combining payroll efficiency with strong privacy protections. Key features: Private payroll – salaries are distributed without exposing individual amounts. Employee control – employees can view their own balances and withdraw funds securely. Zero-knowledge privacy – leverages ZK proofs to keep payroll data confidential. Employer efficiency – employers can submit monthly payroll in a batch transaction. Secure workflows – AI-assisted development and isolated environments ensure safe development practices.
How it's made
## Architecture - Full-stack **ShadowPay** hackathon app: private, programmable payroll for global teams powered by [Unlink](https://unlink.xyz) zero-knowledge proofs - Employer dashboard: add employees, run payroll (bulk ZK transfers) - Employee dashboard: view own salary, private shielded balance, withdraw to EVM wallet - Vercel deployment config for frontend (Vite/Vue 3) + backend (Express serverless) ## Tech Stack | Layer | Tech | |---|---| | Frontend | Vue 3 + Vite + Tailwind CSS + Pinia | | Backend | Express (local) / Vercel serverless (prod) | | Privacy | `@unlink-xyz/sdk` — ZK-shielded transfers, real bech32m Unlink addresses | ## Vercel Deployment Import the repo in [vercel.com](https://vercel.com), then add these environment variables: | Variable | Description | |---|---| | `UNLINK_API_KEY` | From [unlink.xyz](https://unlink.xyz) dashboard | | `UNLINK_ENGINE_URL` | `https://staging-api.unlink.xyz` | | `MASTER_MNEMONIC` | BIP-39 mnemonic — index 0 = employer, index N = employee N | | `EMPLOYER_PRIVATE_KEY` | private key for employer account | | `EMPLOYER_PASSWORD` | Password for the employer dashboard | | `RPC_URL` | RPC to base sepolia | ## Demo credentials - Employer: `employer123` - Alice Chen (Sr. Engineer, $1/mo): `alice123` - Bob Martinez (PM, $2/mo): `bob123` - Carol Kim (Designer, $3/mo): `carol123` ## Token USDC on base sepolia is used as payment token: 0xC1a5D4E99BB224713dd179eA9CA2Fa6600706210 ## AI Assistance **Claude** (AI assistant) was used to aid in code generation, testing, deployment, and workflow automation. > **Security Note:** To ensure safety while experimenting with AI and untrusted code/libraries, all AI interactions were performed in isolated environments using a dedicated GitHub account and virtual machines. Certain agentic workflows had full control of this codebase, and not all parts of the code underwent in-depth human review. For reference, my main GitHub account is: [DOBEN](https://github.com/DOBEN)