SecureShare: A Zero-Knowledge, Blockchain-Powered Platform for Secure File Sharing

#web3 #cybersecurity #zeroknowledge

Imagine sharing sensitive files — medical records, legal docs, or private datasets — with someone halfway across the world…

Without trusting Google, Dropbox, or anyone in between.

🔐 That’s what I built: SecureShare — a blockchain-powered, zero-knowledge file sharing platform with:

📦 On-chain access control (no centralized permissions)
🔐 Client-side encryption (data stays yours)
📜 Immutable audit logs (for compliance + accountability)
🔄 Real-time notifications + access tracking
🔓 Role-based access control + enterprise SSO
⚡ Layer-2 support for gas savings (Polygon, Arbitrum)

🚀 Tech Stack

Frontend: React 18 + TypeScript + TailwindCSS + Zustand
Blockchain: Solidity + Sepolia Testnet + Wagmi + Viem
Backend: Node.js + Express + SQLite + Prisma
Security: CryptoJS encryption, JWT auth, Helmet, Rate Limiting
UI/UX: Framer Motion + drag-n-drop upload zone + WebSocket updates

🛠 How It Works

You connect your wallet (MetaMask or any EVM-compatible)
Upload a file → it gets client-side encrypted
File hash is stored on-chain + mapped to your wallet
You grant access to other Ethereum addresses (RBAC-style)
All access grants/revokes are logged immutably on the blockchain
Your dashboard shows every access event, confirmed on-chain

Every file, every access, every log — fully transparent, fully trustless.

🌐 Why This Matters

We’re entering a world where data sovereignty and privacy are non-negotiable.

🔎 Centralized systems can be hacked, censored, or tampered with
🧠 Blockchain lets us build trustless systems with verifiable permissions
🛡️ Zero-knowledge and encryption ensure privacy without compromise
⚙️ Enterprises need compliance (GDPR, HIPAA, SOX) — SecureShare bakes that in

Whether it’s used by healthcare firms, legal teams, journalists, or decentralized orgs — SecureShare ensures you control who sees your data, and when.