ShadowPay

Employers can run monthly payroll seamlessly while leveraging U 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.

Architecture

• Full-stack ShadowPay hackathon app: private, programmable payroll for global teams powered by U 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 v, then add these environment variables:

| Variable | Description | |---|---| | UNLINK_API_KEY | From u 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: D