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+# Content-Security-Policy for Nginx
+
+## Quick Setup
+
+Add these lines to your Nginx configuration (`/etc/nginx/sites-available/swarming.site`):
+
+### 1. Add CSP Header (inside server block, after `index index.html;`)
+
+```nginx
+# Security Headers
+add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-eval' 'unsafe-inline' https://mtm.swarm.foundation https://app.formbricks.com https://unpkg.com https://*.walletconnect.com https://*.walletconnect.org; style-src 'self' 'unsafe-inline'; img-src 'self' blob: data: https://*.walletconnect.com https://*.walletconnect.org https://ethswarm.org https://www.ethswarm.org https://bzz.link https://swarming.site https://*.githubusercontent.com https://avatars.githubusercontent.com https://raw.githubusercontent.com; font-src 'self' data:; connect-src 'self' https://mtm.swarm.foundation https://app.formbricks.com https://api.relay.link https://gateway.thegraph.com https://swarming.site https://bzz.link https://rpc.gnosischain.com https://gnosis-mainnet.public.blastapi.io https://gnosis.drpc.org https://eth.llamarpc.com https://ethereum.publicnode.com https://cloudflare-eth.com https://rpc.ankr.com https://1rpc.io https://*.infura.io https://*.alchemy.com https://*.quicknode.pro https://*.walletconnect.com https://*.walletconnect.org https://relay.walletconnect.com https://relay.walletconnect.org https://*.coinbase.com https://*.web3modal.com wss://relay.walletconnect.com wss://relay.walletconnect.org wss://*.walletconnect.com wss://*.walletconnect.org; frame-src 'self' https://*.walletconnect.com https://*.walletconnect.org https://verify.walletconnect.com https://verify.walletconnect.org https://*.coinbase.com https://app.formbricks.com; object-src 'none'; base-uri 'self'; form-action 'self'; frame-ancestors 'none'; upgrade-insecure-requests;" always;
+add_header X-Frame-Options "DENY" always;
+add_header X-Content-Type-Options "nosniff" always;
+add_header Referrer-Policy "strict-origin-when-cross-origin" always;
+add_header Permissions-Policy "camera=(), microphone=(), geolocation=()" always;
+```
+
+### 2. Test and Reload
+
+```bash
+sudo nginx -t
+sudo systemctl reload nginx
+```
+
+### 3. Verify
+
+```bash
+curl -I https://swarming.site | grep -i content-security-policy
+```
+
+## 3rd Party Domains Whitelisted
+
+### Analytics & Feedback
+- **`https://mtm.swarm.foundation`** - Matomo analytics
+- **`https://app.formbricks.com`** - Formbricks feedback widget
+
+### Blockchain & Web3
+- **`https://api.relay.link`** - Relay API for cross-chain swaps
+- **`https://gateway.thegraph.com`** - The Graph for ENS subgraph queries
+- **`https://*.walletconnect.com`** - WalletConnect protocol
+- **`https://*.walletconnect.org`** - WalletConnect services
+- **`wss://relay.walletconnect.com`** - WalletConnect WebSocket
+- **`https://*.coinbase.com`** - Coinbase Wallet
+- **`https://*.web3modal.com`** - Web3Modal
+
+### RPC Providers (Blockchain Nodes)
+- **`https://rpc.gnosischain.com`** - Gnosis Chain RPC
+- **`https://gnosis-mainnet.public.blastapi.io`** - Gnosis Chain (BlastAPI)
+- **`https://gnosis.drpc.org`** - Gnosis Chain (dRPC)
+- **`https://eth.llamarpc.com`** - Ethereum RPC (Llama)
+- **`https://ethereum.publicnode.com`** - Ethereum public node
+- **`https://cloudflare-eth.com`** - Ethereum (Cloudflare)
+- **`https://rpc.ankr.com`** - Multi-chain RPC (Ankr)
+- **`https://1rpc.io`** - Multi-chain RPC (1RPC)
+- **`https://*.infura.io`** - Infura RPC services
+- **`https://*.alchemy.com`** - Alchemy RPC services
+- **`https://*.quicknode.pro`** - QuickNode RPC services
+
+### Storage & Content
+- **`https://swarming.site`** - Swarm Bee node API
+- **`https://bzz.link`** - Swarm gateway
+- **`https://ethswarm.org`** - Swarm website/images
+- **`https://*.githubusercontent.com`** - GitHub raw content
+
+### Other
+- **`https://unpkg.com`** - NPM package CDN
+- **`blob:`** - Browser-generated blob URLs
+- **`data:`** - Data URIs for inline content
+
+## CSP Directives Explained
+
+| Directive | What It Controls | Why Unsafe Flags Needed |
+|-----------|------------------|-------------------------|
+| `script-src` | JavaScript execution | `'unsafe-eval'` - Web3 libraries (ethers.js, viem)<br>`'unsafe-inline'` - Matomo analytics inline script |
+| `style-src` | CSS/Styles | `'unsafe-inline'` - RainbowKit dynamic styling |
+| `img-src` | Images | `blob:` `data:` - Dynamically generated images |
+| `connect-src` | API calls, WebSockets | All RPC providers and API endpoints |
+| `frame-src` | Iframes | Wallet connection modals, feedback widget |
+| `object-src` | Plugins (Flash, etc.) | Blocked with `'none'` |
+| `frame-ancestors` | Embedding this site | Blocked with `'none'` (prevents clickjacking) |
+
+## Complete Nginx Server Block Example
+
+```nginx
+server {
+    listen 443 ssl;
+    server_name swarming.site www.swarming.site;
+
+    # SSL Configuration
+    ssl_certificate /etc/letsencrypt/live/swarming.site/fullchain.pem;
+    ssl_certificate_key /etc/letsencrypt/live/swarming.site/privkey.pem;
+
+    # Serve Static Website
+    root /var/www/beeport/out/;
+    index index.html;
+
+    # Security Headers - ADD THESE
+    add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-eval' 'unsafe-inline' https://mtm.swarm.foundation https://app.formbricks.com https://unpkg.com https://*.walletconnect.com https://*.walletconnect.org; style-src 'self' 'unsafe-inline'; img-src 'self' blob: data: https://*.walletconnect.com https://*.walletconnect.org https://ethswarm.org https://www.ethswarm.org https://bzz.link https://swarming.site https://*.githubusercontent.com https://avatars.githubusercontent.com https://raw.githubusercontent.com; font-src 'self' data:; connect-src 'self' https://mtm.swarm.foundation https://app.formbricks.com https://api.relay.link https://gateway.thegraph.com https://swarming.site https://bzz.link https://rpc.gnosischain.com https://gnosis-mainnet.public.blastapi.io https://gnosis.drpc.org https://eth.llamarpc.com https://ethereum.publicnode.com https://cloudflare-eth.com https://rpc.ankr.com https://1rpc.io https://*.infura.io https://*.alchemy.com https://*.quicknode.pro https://*.walletconnect.com https://*.walletconnect.org https://relay.walletconnect.com https://relay.walletconnect.org https://*.coinbase.com https://*.web3modal.com wss://relay.walletconnect.com wss://relay.walletconnect.org wss://*.walletconnect.com wss://*.walletconnect.org; frame-src 'self' https://*.walletconnect.com https://*.walletconnect.org https://verify.walletconnect.com https://verify.walletconnect.org https://*.coinbase.com https://app.formbricks.com; object-src 'none'; base-uri 'self'; form-action 'self'; frame-ancestors 'none'; upgrade-insecure-requests;" always;
+    add_header X-Frame-Options "DENY" always;
+    add_header X-Content-Type-Options "nosniff" always;
+    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
+    add_header Permissions-Policy "camera=(), microphone=(), geolocation=()" always;
+
+    location / {
+        try_files $uri /index.html;
+    }
+
+    # Your existing /bzz, /stamps, /wallet proxy locations...
+}
+```
+
+## Troubleshooting
+
+### Issue: Wallet won't connect
+- Check browser console for CSP violations
+- Look for blocked WalletConnect domains
+- Verify `*.walletconnect.com` and `*.walletconnect.org` are in both `script-src`, `connect-src`, and `frame-src`
+
+### Issue: API calls failing
+- Check Network tab in browser DevTools
+- Add missing API domain to `connect-src`
+- Include both `https://` and `wss://` if WebSocket is used
+
+### Issue: Images not loading
+- Check console for blocked image URLs
+- Add domain to `img-src`
+
+### Issue: Nginx won't reload
+- Run `sudo nginx -t` to check syntax
+- Common issue: Missing semicolon or unclosed quote
+- Make sure CSP is on one line or properly escaped if split
+
+## Adding New Services
+
+When you add a new 3rd party service:
+
+1. Test in browser and check console for CSP violations
+2. Note the blocked domain
+3. Add to appropriate directive:
+   - JavaScript → `script-src`
+   - API calls → `connect-src`
+   - Images → `img-src`
+   - Iframes → `frame-src`
+4. Reload Nginx and test again
+
+## Security Notes
+
+- **`'unsafe-eval'`** - Required by Web3 libraries (ethers.js, viem) for dynamic code
+- **`'unsafe-inline'`** - Required for Matomo analytics and RainbowKit styling
+- All external domains are explicitly whitelisted
+- CSP works with static export (`output: 'export'`) - headers added by Nginx
+
+## Testing
+
+```bash
+# Check if CSP header exists
+curl -I https://swarming.site | grep -i content-security-policy
+
+# Test in browser
+# 1. Open https://swarming.site
+# 2. Open DevTools (F12) → Console
+# 3. Look for CSP violations (should be none)
+# 4. Test wallet connection, uploads, swaps
+```
+