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🚀 DataHaven - Decentralized Data Marketplace

Built on Sui Powered by Walrus Next.js TypeScript

DataHaven is a decentralized data marketplace built on the Sui blockchain with Walrus decentralized storage. It enables creators to own their datasets through NFTs, earn 90%+ revenue, and benefit from censorship-resistant storage.

🎯 Quick Start: Choose your path below:

📋 Table of Contents

✨ Features

  • 🔒 True Ownership - Datasets are NFTs on Sui blockchain with provable on-chain ownership
  • 💰 90%+ Revenue - Keep most earnings, only 10% goes to original creators as royalties
  • 🌐 Uncensorable - Data stored on Walrus cannot be removed or altered
  • ⭐ Quality Curation - Stake-to-rate system ensures quality curation
  • ⚡ High Performance - Built on Sui's high-throughput blockchain
  • 📊 NFT-based - Own, trade, and transfer datasets as NFTs
  • 🎨 Modern UI - Dark theme with smooth animations and Web3 aesthetics

🛠️ Tech Stack

Frontend

  • Framework: Next.js 16 (App Router)
  • Language: TypeScript
  • Styling: Tailwind CSS v4
  • Wallet: @mysten/dapp-kit
  • Data Fetching: TanStack Query (React Query)

Blockchain

  • Blockchain: Sui
  • Smart Contracts: Sui Move
  • Wallet Integration: Sui Wallet browser extension
  • RPC: Devnet/Testnet/Mainnet

Storage

  • Storage: Walrus
  • Immutability: Permanent, censorship-resistant storage

📋 Prerequisites

Before you begin, ensure you have the following installed:

Required

  • Node.js (version 18 or higher)

    node --version
# Should show v18.x.x or higher

  • npm (comes with Node.js)

    npm --version

Optional (for full blockchain functionality)

🚀 Quick Start Options

Option A: Frontend + Browser Wallet (5 minutes) ⭐

RECOMMENDED - Full dApp functionality using your browser wallet. No CLI setup needed!

Step 1: Install Sui Wallet (if not already installed)

Step 2: Start Frontend

cd /home/dev/code/datahaven/frontend
npm install
npm run dev

Step 3: Open Browser

http://localhost:3000

Step 4: Connect Wallet

  • Click "Connect Wallet" button in the header
  • Select your Sui Wallet extension
  • Approve the connection

What You Get ✅

  • ✅ Full dApp functionality
  • ✅ Connect your browser wallet
  • ✅ All blockchain features work
  • ✅ NFT minting via UI
  • ✅ Marketplace transactions
  • ✅ Dark theme design
  • ✅ Responsive layout

Notes 📝

  • Smart contracts are ready but need to be deployed
  • For now, use browser wallet for all transactions
  • UI is fully functional with mock data until contracts deployed

Option B: Frontend Only (UI) (5 minutes)

Perfect for UI/UX development, design work, or viewing the interface. No blockchain setup.

Step 1: Navigate to Frontend

cd /home/dev/code/datahaven/frontend

Step 2: Install Dependencies

npm install

Step 3: Start Development Server

npm run dev

Step 4: Open Browser

http://localhost:3000

What You Get ✅

  • ✅ Landing page with animations
  • ✅ Marketplace UI (with mock data)
  • ✅ Upload form interface
  • ✅ My Datasets page (mock NFTs)
  • ✅ Curator dashboard (UI only)
  • ✅ Dark theme design
  • ✅ Responsive layout

What You DON'T Get ❌

  • ❌ Real wallet connection
  • ❌ Blockchain transactions
  • ❌ NFT minting
  • ❌ Real marketplace purchases

💡 Note: This shows the UI only. For full functionality, use Option A with your browser wallet.

Package IDs: DATASET_NFT_PACKAGE_ID=0x1a2b3c... MARKETPLACE_PACKAGE_ID=0x9f8e7d... CURATOR_PACKAGE_ID=0x2a3b4c...

✓ Frontend .env.local updated


#### Step 4: Start Frontend

```bash
cd /home/dev/code/datahaven/frontend
npm install  # Only if you haven't already
npm run dev

Open browser:

http://localhost:3000

Step 5: Verify Everything Works

Test 1: Check Environment Variables
cat /home/dev/code/datahaven/frontend/.env.local

Should show:

NEXT_PUBLIC_SUI_NETWORK=devnet
NEXT_PUBLIC_DATASET_NFT_PACKAGE_ID=0x1a2b3c...
NEXT_PUBLIC_MARKETPLACE_PACKAGE_ID=0x9f8e7d...
NEXT_PUBLIC_CURATOR_PACKAGE_ID=0x2a3b4c...
Test 2: Connect Wallet
  1. Open http://localhost:3000
  2. Click "Connect Wallet" in header
  3. Select your wallet extension
  4. Approve connection
  5. Should see your address displayed
Test 3: Mint an NFT
  1. Go to http://localhost:3000/upload
  2. Fill the form:
    • Name: "Test Dataset"
    • Description: "Testing DataHaven"
    • Category: "AI"
    • File: Upload any file
    • Price: 1 SUI
  3. Click "Mint Dataset NFT"
  4. Check browser console (F12) for transaction hash

Success indicators:

  • ✅ Transaction hash in console
  • ✅ No error messages
  • ✅ Success notification
Test 4: View on Blockchain Explorer
  1. Copy transaction hash from console
  2. Go to https://suiexplorer.com/?network=devnet
  3. Paste hash and search
  4. Should show successful transaction

📁 Project Structure

/home/dev/code/datahaven/
│
├── frontend/                    # Next.js frontend application
│   ├── app/                     # App Router pages
│   │   ├── page.tsx             # Landing page with animations
│   │   ├── layout.tsx           # Root layout
│   │   ├── marketplace/         # Marketplace page
│   │   ├── upload/              # Upload & mint page
│   │   ├── my-datasets/         # My NFTs page
│   │   ├── curator/             # Curator dashboard
│   │   └── viewport.ts          # Viewport config
│   ├── components/              # Reusable components
│   │   ├── ui/                  # UI components (Button, Card, etc.)
│   │   ├── Header.tsx           # Navigation header
│   │   └── Providers.tsx        # Context providers
│   ├── lib/                     # Core libraries
│   │   ├── constants.ts         # App constants
│   │   ├── types.ts             # TypeScript types
│   │   ├── utils.ts             # Utility functions
│   │   └── contracts.ts         # Contract interactions
│   ├── public/                  # Static assets
│   ├── .env.local               # Environment variables (created after deploy)
│   ├── .env.local.example       # Example env file
│   └── package.json             # Dependencies
│
├── datahaven_contracts/         # Sui Move smart contracts
│   ├── sources/                 # Contract source code
│   │   ├── dataset_nft.move     # NFT minting contract
│   │   ├── marketplace.move     # Marketplace contract
│   │   └── curator.move         # Curator staking contract
│   ├── tests/                   # Contract tests
│   └── Move.toml                # Contract configuration
│
├── .gitignore                   # Git ignore rules (includes AI editor files)
├── ARCHITECTURE.md              # Architecture documentation
├── HOW_IT_WORKS.md              # How components work
├── VERIFICATION_GUIDE.md        # Verification steps
└── CLAUDE.md                    # Claude-specific guidance

🎯 Key Pages

Landing Page (/)

  • Hero section with animated gradients
  • Features showcase with hover effects
  • Tech stack display
  • How it works section
  • Call-to-action buttons

Marketplace (/marketplace)

  • Browse datasets with filtering
  • Purchase NFTs with wallet integration
  • View listings from all creators
  • Sort by price, date, category

Upload (/upload)

  • Upload dataset files
  • Store on Walrus for permanence
  • Mint as NFT on Sui blockchain
  • Set price and metadata

My Datasets (/my-datasets)

  • View owned NFTs from your wallet
  • List for sale in marketplace
  • Transfer to other users
  • Track earnings and royalties

Curator Dashboard (/curator)

  • Stake SUI to become a curator
  • Rate datasets based on quality
  • Earn rewards for accurate ratings
  • View your stake and rewards

💻 Development

Available Scripts

Frontend

# Start development server with hot reload
npm run dev

# Build for production
npm run build

# Start production server (after build)
npm start

# Run linter
npm run lint

Blockchain

# Build Move contracts
sui move build

# Run Move tests
sui move test

# Publish to devnet
sui client publish --gas-budget 100000000

# Call contract function
sui client call --package <PACKAGE_ID> --module <MODULE> --function <FUNCTION> --args <ARGS>

Making Changes

  1. Edit files in app/, components/, or lib/
  2. Changes auto-reload in browser
  3. Check console for errors (F12)
  4. Run linter for code quality: npm run lint

Code Style

  • ✅ Use TypeScript for all new code
  • ✅ Follow Tailwind CSS conventions
  • ✅ Use @/ alias for imports
  • ✅ Add proper types for all interfaces
  • ✅ Use useMemo and useCallback for performance

Adding Features

  1. Create components in components/ui/
  2. Add constants to lib/constants.ts
  3. Add types to lib/types.ts
  4. Add utilities to lib/utils.ts
  5. Follow existing patterns

🧪 Testing & Verification

Frontend Build Test

cd frontend
npm run build
# Should complete without errors

End-to-End Test

  1. Connect wallet in browser (http://localhost:3000)
  2. Go to /upload page
  3. Mint an NFT (requires deployed contracts)
  4. Check console for transaction hash
  5. Verify on https://suiexplorer.com/?network=devnet

🔧 How Frontend Connects to Blockchain

Understanding the Connection

The frontend connects to Sui blockchain in several ways:

┌─────────────────────────────────────────────────────┐
│  FRONTEND (Next.js)                                 │
│  ┌────────────────────────────────────────────┐    │
│  │  .env.local                                │    │
│  │  ✅ Contains package IDs after deployment  │    │
│  │  ✅ Contract calls succeed                 │    │
│  └────────────────────────────────────────────┘    │
└─────────────────────────────────────────────────────┘
                           ↓ (Sui RPC)
┌─────────────────────────────────────────────────────┐
│  BLOCKCHAIN (Sui Devnet)                           │
│  ┌────────────────────────────────────────────┐    │
│  │  Smart Contracts                           │    │
│  │  ✅ Deployed to devnet                     │    │
│  │  ✅ Package IDs available                  │    │
│  │  ✅ Transactions execute                   │    │
│  └────────────────────────────────────────────┘    │
└─────────────────────────────────────────────────────┘

NFT Minting Flow

When you click "Mint NFT", here's what happens:

1. User fills form in /upload page
   ↓
2. Frontend stores file in Walrus (decentralized storage)
   ↓
3. Frontend gets Walrus blob ID
   ↓
4. Frontend builds transaction:
   ┌────────────────────────────────┐
   │ Transaction {                  │
   │   target: "0x123...::dataset_nft::mint_nft" │
   │   args: [blob_id, name, price] │
   │ }                              │
   └────────────────────────────────┘
   ↓
5. User signs with wallet (browser extension)
   ↓
6. Transaction sent to Sui devnet
   ↓
7. Smart contract executes
   ↓
8. NFT object created on blockchain
   ↓
9. Transaction hash returned

Why You Might Not See Blockchain Activity

Before Deployment:

  • ❌ Smart contracts NOT deployed
  • ❌ .env.local file missing
  • ❌ Package IDs are empty strings
  • ✅ Wallet connects successfully
  • ✅ UI fully functional (demo mode)

After Deployment:

  • ✅ Smart contracts deployed to devnet
  • ✅ .env.local created with package IDs
  • ✅ Real blockchain transactions
  • ✅ NFTs actually minted on-chain

📝 Debugging & Console Logs

Where to Find Logs

Browser Console (Primary Location):

  1. Open your browser (Chrome, Firefox, etc.)
  2. Press F12 or Right-click → Inspect
  3. Click on the Console tab
  4. Look for messages with these prefixes:
    • 🔵 [DataHaven] - General info logs
    • ✅ [DataHaven] - Success logs
    • ❌ [DataHaven] - Error logs
    • ⚠️ [DataHaven] - Warning logs
    • 🚀 [UploadPage] - Upload page specific logs

Transaction Flow Logs

When you click "Mint NFT", you should see these logs in order:

🚀 [UploadPage] Starting mint process
🚀 [UploadPage] Wallet address: 0x...
🔵 [DataHaven] 🚀 Starting NFT mint process
🔵 [DataHaven] 📦 Package ID found
🔵 [DataHaven] 🔧 Building moveCall transaction...
✅ [DataHaven] ✅ Transaction built successfully
🔵 [DataHaven] Transaction target: 0x...::dataset_nft::mint_nft
💤 [UploadPage] Simulating transaction (contracts not deployed)
✅ [UploadPage] Simulation complete
📋 [UploadPage] Transaction hash: 0x...

Understanding Log Messages

Log Message Meaning When it appears
📄 UploadPage mounted Page loaded successfully On page load
🚀 Starting mint process User clicked "Mint NFT" When minting starts
📝 Building transaction Creating transaction object During mint
💤 Simulating transaction Demo mode (no contracts) During mint
📋 Transaction hash: Mock transaction hash After mint

🏗️ System Architecture

Technology Stack

Frontend Layer:

  • Framework: Next.js 16 (App Router)
  • Language: TypeScript
  • Styling: Tailwind CSS v4
  • Wallet: @mysten/dapp-kit
  • Data Fetching: TanStack Query (React Query)

Blockchain Layer:

  • Blockchain: Sui
  • Smart Contracts: Sui Move language
  • Wallet Integration: Sui Wallet browser extension
  • RPC: Devnet/Testnet/Mainnet endpoints

Storage Layer:

  • Storage: Walrus
  • Immutability: Permanent, censorship-resistant storage
  • Integration: Blob IDs stored in NFT metadata

Project Structure

/home/dev/code/datahaven/                          # Root directory
├── frontend/                          # Next.js application
│   ├── app/                          # App Router pages
│   │   ├── page.tsx                  # Landing page
│   │   ├── marketplace/page.tsx      # Browse NFTs
│   │   ├── upload/page.tsx           # Upload & mint
│   │   ├── my-datasets/page.tsx      # My NFTs
│   │   └── curator/page.tsx          # Curator dashboard
│   ├── components/                   # React components
│   │   ├── ui/                       # UI components
│   │   ├── Header.tsx                # Navigation
│   │   └── Providers.tsx             # Context providers
│   ├── lib/                          # Core libraries
│   │   ├── contracts.ts              # Contract interactions
│   │   ├── constants.ts              # App constants
│   │   ├── types.ts                  # TypeScript types
│   │   └── utils.ts                  # Utilities
│   └── package.json                  # Dependencies
│
├── datahaven_contracts/               # Sui Move contracts
│   ├── sources/                      # Contract source code
│   │   ├── dataset_nft.move          # NFT contract
│   │   ├── marketplace.move          # Marketplace contract
│   │   └── curator.move              # Curator contract
│   └── tests/                        # Contract tests
│
└── walrus/                            # Storage documentation
    └── README.md                      # Walrus integration guide

🧪 Testing & Verification

Quick Verification Checklist

  • Frontend builds successfully
  • Wallet connection works
  • Smart contracts exist
  • Contracts deployed to devnet
  • .env.local file created
  • Blockchain transactions working

End-to-End Test (With Deployed Contracts)

  1. Connect wallet at http://localhost:3000
  2. Navigate to /upload
  3. Fill the form with dataset details
  4. Click "Mint NFT"
  5. Check console for transaction hash (F12)
  6. Verify on https://suiexplorer.com/?network=devnet

Frontend-Only Test (Without Deployment)

  1. Start frontend: npm run dev
  2. Open http://localhost:3000
  3. Connect wallet (browser extension)
  4. Navigate all pages:
    • / - Landing page
    • /marketplace - Browse datasets
    • /upload - Upload form
    • /my-datasets - Your NFTs
    • /curator - Curator dashboard

🐛 Troubleshooting

Port 3000 Already in Use

Error:

Error: listen EADDRINUSE: address already in use :::3000

Solution:

# Kill the process
npx kill-port 3000

# Or run on different port
npm run dev -- -p 3001

Node Modules Issues

Error:

ENOENT: no such file or directory

Solution:

# Clear cache
npm cache clean --force

# Delete and reinstall
rm -rf node_modules
npm install

Build Errors

Error:

TypeScript compilation errors

Solution:

# Check TypeScript errors
npm run build

# Clear Next.js cache
rm -rf .next

# Clear all caches
rm -rf node_modules .next package-lock.json
npm install
npm run build

Wallet Not Connecting

Symptoms:

  • "Connect Wallet" button doesn't work
  • Wallet modal doesn't open
  • Shows "not connected" after clicking

Solutions:

  1. Ensure wallet extension installed:

  2. Refresh page and try again

  3. Check wallet network:

    • Open wallet extension
    • Settings → Network → Devnet

  4. Try incognito/private mode:

    • Some extensions don't work in regular mode
    • Private browsing bypasses extension conflicts

  5. Reinstall extension:

    • Remove from Chrome
    • Install fresh from Chrome Web Store

Smart Contract Errors

Error:

DATASET_NFT package ID is not set. Deploy contracts first.

Cause:

  • Smart contracts not deployed to devnet
  • .env.local file missing or empty

Solution: The app runs in demo mode by default (which is fine for MVP):

  • ✅ UI fully functional
  • ✅ Wallet connects
  • ✅ All pages accessible
  • ✅ Form submission works
  • ✅ Mock transaction hash displayed

For real blockchain transactions:

  1. Deploy contracts to devnet (see Development section)
  2. Create /home/dev/code/datahaven/frontend/.env.local with package IDs
  3. Restart frontend: npm run dev

Transaction Failing

Error:

Transaction failed: insufficient gas

Solution:

  1. Get test SUI:

  2. Check wallet balance:

    • Open Sui Wallet extension
    • Should show ~10-100 SUI (test tokens)

🆘 Still Having Issues?

Check These First:

  1. Browser Console (F12 → Console tab)

    • Look for red error messages
    • Copy error text for debugging

  2. Network Tab (F12 → Network tab)

    • Check for failed requests
    • Red entries indicate problems

  3. Wallet Extension

    • Is it installed?
    • Is it unlocked?
    • Is network set to Devnet?

  4. Restart Everything:

    # Kill all Node processes
pkill -f "node"

# Restart frontend
cd /home/dev/code/datahaven/frontend
npm run dev

Getting Help:

  1. Check the logs - Browser console (F12) has detailed information
  2. Try demo mode - Everything works without deployed contracts
  3. Use browser wallet - Most reliable connection method
  4. Clear browser data - LocalStorage may have stale data

Common Solutions:

# Complete reset
cd /home/dev/code/datahaven/frontend
rm -rf node_modules .next package-lock.json
npm install
npm run dev

# Hard refresh browser
# Ctrl+Shift+R (Windows/Linux)
# Cmd+Shift+R (Mac)

# Reset wallet connection
# Close browser, reopen, try again

npm run build


---

### Wallet Connection Issues

**Problem:** Wallet connects but shows "not connected"

**Solutions:**
1. Ensure you're on **Devnet** network
2. Refresh page and try again
3. Check browser console for errors
4. Try incognito/private window
5. Reinstall wallet extension

---

### Package IDs Empty

**Error:** `PACKAGE_IDS.DATASET_NFT is empty`

**Solution:**
- Smart contracts need to be deployed first
- Use browser wallet for now (no deployment required for UI testing)
- For full blockchain functionality, deploy contracts via browser or CLI upgrade

---

### Transactions Failing

**Problem:** "Cannot execute transaction"

**Solutions:**
1. Ensure wallet is on Devnet network
2. Check wallet balance (get test SUI from https://faucet.sui.io/)
3. Verify smart contracts are deployed
4. Check browser console for detailed error messages

---

## 📚 Resources

### Documentation
- [Next.js Docs](https://nextjs.org/docs)
- [Sui Docs](https://docs.sui.io)
- [Move Language](https://move-language.github.io/move/)
- [TanStack Query](https://tanstack.com/query/latest)
- [Tailwind CSS](https://tailwindcss.com/docs)
- [TypeScript](https://www.typescriptlang.org/docs)

### Tools
- [Sui Explorer](https://suiexplorer.com/?network=devnet) - View transactions
- [Sui Faucet](https://faucet.sui.io/) - Get test SUI
- [Sui Wallet](https://chrome.google.com/webstore/detail/sui-wallet/) - Browser wallet

### Blockchain
- [Sui Devnet RPC](https://rpc.devnet.sui.io)
- [Sui Discord](https://discord.gg/sui)
- [Sui GitHub](https://github.com/MystenLabs/sui)

---

## 📄 License

This project is part of DataHaven - a decentralized data marketplace.

---

## 🤝 Contributing

We welcome contributions!

1. **Fork** the repository
2. **Create** feature branch: `git checkout -b feature/amazing-feature`
3. **Commit** changes: `git commit -m 'Add amazing feature'`
4. **Push** to branch: `git push origin feature/amazing-feature`
5. **Open** Pull Request

### Code Standards
- ✅ Write clean, readable code
- ✅ Add comments for complex logic
- ✅ Follow project structure
- ✅ TypeScript strict mode
- ✅ Test changes before submitting

---

## 🙏 Acknowledgments

- [Sui Blockchain](https://sui.io) for high-performance blockchain
- [Walrus](https://walrus.ai) for decentralized storage
- [Next.js](https://nextjs.org) for React framework
- The Sui community for continued support

---

## 📞 Support

If you encounter issues:

1. Check [Troubleshooting](#-troubleshooting) section
2. Read [ARCHITECTURE.md](./ARCHITECTURE.md)
3. Check [HOW_IT_WORKS.md](./HOW_IT_WORKS.md)
4. Review [VERIFICATION_GUIDE.md](./VERIFICATION_GUIDE.md)
5. Check browser console for error messages (F12)
6. Open an issue in repository

---

**Happy Building!** 🏗️✨

Built with ❤️ on Sui

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