A web application that generates professional, printable certificates of authenticity for NFTs. Simply enter your blockchain network, contract address, and token ID to create a beautiful certificate with blockchain verification.

• 🎨 Professional Design: Clean, print-ready certificate layout
• 🔗 Multi-Chain Support: Ethereum, Polygon, BSC, Arbitrum, Optimism, Avalanche, Base
• 📱 Responsive Design: Works on desktop and mobile devices
• 🖨️ Print Optimized: High-quality PDF generation for printing
• 🔍 Blockchain Verification: QR codes linking to block explorers
• 🚀 No Registration: Free to use, no account required
• 📊 Complete Metadata: Displays all NFT attributes and information

Visit the live application at: https://jamesmorgan.github.io/nft-coa/

1. Select Network: Choose from supported EVM-compatible blockchains
2. Enter Details: Input your NFT contract address and token ID
3. Generate: Click to create your certificate
4. Download/Print: Save as PDF or print directly

• Ethereum Mainnet
• Polygon
• BSC (Binance Smart Chain)
• Arbitrum One
• Optimism
• Avalanche
• Base
• Custom RPC endpoints

• Frontend: React 18 + TypeScript
• Styling: Tailwind CSS
• Blockchain: ethers.js v6
• RPC Providers: Infura (primary), Alchemy (fallback), Public endpoints
• PDF Generation: jsPDF
• QR Codes: qrcode.js
• Deployment: GitHub Pages

• Node.js 18+
• npm or yarn

# Clone the repository
git clone https://github.com/jamesmorgan/nft-coa.git
cd nft-coa

# Install dependencies
npm install

# Start development server
npm run dev

For better performance and higher rate limits, you can add your own API keys:

1. Create a .env.local file in the project root
2. Add your API keys:

# Infura API Key (recommended)
VITE_INFURA_API_KEY=your_infura_api_key_here

The app will automatically use these keys if available, otherwise it falls back to public endpoints.

### Build

```bash
# Build for production
npm run build

# Preview production build
npm run preview

Contributions are welcome! Please feel free to submit a Pull Request.

1. Fork the repository
2. Create your feature branch (git checkout -b feature/AmazingFeature)
3. Commit your changes (git commit -m 'Add some AmazingFeature')
4. Push to the branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

This project is licensed under the MIT License - see the LICENSE file for details.

• Built with Vite
• UI components with Tailwind CSS
• Blockchain integration with ethers.js
• Icons by Lucide

If you encounter any issues or have questions, please open an issue on GitHub.