# Defender Deprecated - Migration Guide

**Date**: 2025-12-11
**Status**: Defender No Longer Available

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## ⚠️ Important Notice

**OpenZeppelin Defender is no longer offered**. All references to Defender have been removed from the deployment scripts and documentation.

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## ✅ What's Been Updated

### Deployment Scripts

- ✅ `DeployMainnetTether.s.sol` - Removed Defender references
- ✅ `DeployTransactionMirror.s.sol` - Removed Defender references
- ✅ Now use `TETHER_ADMIN` and `MIRROR_ADMIN` directly

### Documentation

- ✅ Updated to use admin addresses (multisig or EOA)
- ✅ Removed Defender-specific instructions
- ✅ Added Gnosis Safe as recommended alternative

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## 🔄 Migration Steps

### 1. Choose New Admin Solution

**Recommended**: Gnosis Safe (multisig wallet)

### 2. Set Up Admin Address

1. Create Gnosis Safe wallet: https://safe.global/
2. Add signers (3-5 recommended)
3. Set threshold (e.g., 2-of-3)
4. Copy Safe address

### 3. Update .env File

Remove any `DEFENDER_ADMIN` references and add:

```bash
TETHER_ADMIN=<your_admin_address>  # Gnosis Safe or EOA
MIRROR_ADMIN=<your_admin_address>  # Can be same or different
```

### 4. Deploy Contracts

Deployment scripts now work with standard admin addresses:

```bash
forge script script/DeployMainnetTether.s.sol \
  --rpc-url $ETH_MAINNET_RPC_URL \
  --private-key $PRIVATE_KEY \
  --broadcast \
  --verify \
  -vvvv
```

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## 📚 Alternative Solutions

### Gnosis Safe (Recommended)

- Multi-signature wallet
- Web interface
- Multiple chain support
- Enhanced security

### EOA (Externally Owned Account)

- Simple wallet address
- For development/testing
- Use hardware wallet for security

### Custom Access Control

- OpenZeppelin AccessControl
- OpenZeppelin AccessManager
- Custom permission contracts

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## 📄 Related Documentation

- `ADMIN_ADDRESS_OPTIONS.md` - Detailed admin address options
- `DEPLOYMENT_ISSUES_AND_FIXES.md` - Deployment troubleshooting
- `FINAL_PRE_DEPLOYMENT_CHECKLIST.md` - Pre-deployment checklist

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**Last Updated**: 2025-12-11
**Status**: Defender Deprecated - Migration Complete