ShieldCard Demo | Private Corporate Spend Control on Fhenix CoFHE

Description

ShieldCard is a confidential corporate spend control app built for the Fhenix Buildathon, entered from Wave 2. It lets an admin register employees, set encrypted spending limits, receive encrypted payment requests, evaluate approval logic privately on ciphertext, and publish only final approved or denied outcomes to an auditable onchain trail. In this demo, we show: • encrypted employee request submission • private policy evaluation using Fhenix CoFHE • permit gated result reveal for authorized users • public observer view with ciphertext handles instead of plaintext • admin publish flow for final audit visibility Live app: https://shieldcard-fhenix.netlify.app GitHub: https://github.com/Vinaystwt/ShieldCard Contract on Arbitrum Sepolia: 0x536b31435bFAE994169181AcA9BAadC784555b4B Arbiscan: https://sepolia.arbiscan.io/address/0x536b31435bFAE994169181AcA9BAadC784555b4B Built with: Fhenix CoFHE, Solidity, Hardhat, Next.js, TypeScript, Arbitrum Sepolia