# Defender Sunset Notice

**Date**: 2025-12-11
**Status**: Defender Being Phased Out

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## ⚠️ Important Update

According to [OpenZeppelin's announcement](https://blog.openzeppelin.com/doubling-down-on-open-source-and-phasing-out-defender):

- **New user sign-ups disabled**: June 30, 2025
- **Final shutdown**: July 1, 2026
- **Focus**: Open-source alternatives (Relayer, Monitor)

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## ✅ What's Been Updated

### Deployment Scripts

- ✅ `DeployMainnetTether.s.sol` - Removed Defender, uses `TETHER_ADMIN`
- ✅ `DeployTransactionMirror.s.sol` - Removed Defender, uses `MIRROR_ADMIN`
- ✅ All Defender references removed

### Documentation

- ✅ `ADMIN_ADDRESS_OPTIONS.md` - Admin address alternatives
- ✅ `DEFENDER_DEPRECATED.md` - Migration guide
- ✅ All Defender-specific documentation updated

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## 🔄 Migration to Alternatives

### Recommended: Gnosis Safe (Multisig)

**Why**:
- ✅ Multi-signature security
- ✅ Web interface
- ✅ Multiple chain support
- ✅ Battle-tested
- ✅ No sunset date

**Setup**:
1. Create Safe wallet: https://safe.global/
2. Add signers (3-5 recommended)
3. Set threshold (e.g., 2-of-3)
4. Use Safe address as admin

### OpenZeppelin Open-Source Alternatives

OpenZeppelin is providing open-source alternatives:

- **Relayer**: Open-source transaction relayer
- **Monitor**: Open-source monitoring solution
- **Managed Service**: Hosted infrastructure option

Visit: [OpenZeppelin Open Source Stack](https://blog.openzeppelin.com/doubling-down-on-open-source-and-phasing-out-defender)

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## 📋 Current Configuration

### Environment Variables

Set in `.env`:
```bash
TETHER_ADMIN=<admin_address>  # Gnosis Safe or EOA
MIRROR_ADMIN=<admin_address>  # Can be same or different
```

### Deployment

Scripts now work with standard admin addresses:
- No Defender dependencies
- Simple admin pattern (Ownable-like)
- Compatible with any address (multisig, EOA, or contract)

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## 📚 References

- [OpenZeppelin Defender Sunset Announcement](https://blog.openzeppelin.com/doubling-down-on-open-source-and-phasing-out-defender)
- [Gnosis Safe Documentation](https://docs.safe.global/)
- [OpenZeppelin Access Control](https://docs.openzeppelin.com/contracts/5.x/access-control)

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**Last Updated**: 2025-12-11
**Status**: Defender Removed - Alternatives Documented