TranzGuard Shield — MetaMask Snap

Real-time wallet address verification before every MetaMask transaction. Calls https://tranzguard.com/api/v1/verify-address and surfaces a severity: critical warning inside MetaMask if the destination is flagged.

What it blocks

• Clipboard-hijacking address swaps
• Known wallet-drainer campaigns (ScamSniffer DB)
• OFAC SDN / sanctioned mixers (Tornado Cash, Lazarus)
• Address-poisoning vanity patterns
• CISA KEV-correlated addresses

Permissions

• endowment:transaction-insight — fires onTransaction for every send
• endowment:network-access — calls the TranzGuard verification API

Local dev

npm install
npm run build         # produces dist/bundle.js
npm run serve         # serves on http://localhost:8080

Test inside MetaMask Flask:

1. Open Flask
2. Visit a dApp that uses snaps (or use the snap test harness)
3. Connect to the local snap at http://localhost:8080

Publishing

npm login
npm run build
npm publish --access public

Then submit to the MetaMask Snap directory:

• Package: @tranzguard/snap
• Category: Security
• Description copy lives in snap.manifest.json