CASE STUDY // WEB3 & MOBILE

CertChain // Decentralized Academic Credential Verification

Full-stack Web3 certificate issuance and instant verification platform featuring an Expo Router mobile client, ethers.js polyfills, and Solidity smart contracts.

ReactReact NativeExpoethers.jsHardhatSolidityWeb3

GitHub Repository↗

Overview

CertChain is a full-stack decentralized application engineered to eliminate academic credential fraud. It provides educational institutions with a cryptographic issuance portal and students/employers with an instantaneous, tamper-proof mobile verification experience.

Architecture & Engineering Highlights

Mobile Web3 Polyfills: Solved mobile cryptographic runtime limitations by engineering custom Node.js crypto/buffer shims for ethers.js inside an Expo Router cross-platform architecture.
Glassmorphism Mobile UI: Designed an ultra-responsive, high-framerate mobile interface with tactile haptic feedback and dynamic QR code scanners.
Solidity Smart Contracts: Developed gas-optimized ERC-style credential registry contracts using Hardhat, featuring indexed event emissions for sub-second log queries.
Merkle Proof Verification: Enables lightweight client-side verification where mobile clients query Merkle roots on-chain without downloading large payload blocks.