# Bridge Chains Implementation - Completion Summary

**Last Updated:** 2026-02-01  
**Document Version:** 1.0  
**Status:** Active Documentation

---

**Date:** 2026-01-31  
**Status:** ✅ All recommended next steps complete

---

## Summary

All three recommended implementation phases have been completed:

1. **Phase 1:** Gnosis Chain, Celo, Wemix added to CCIP bridge configuration
2. **Phase 2:** Polygon and Optimism added to Li.Fi settlement layer
3. **Phase 6:** Li.Fi integrated into Go bridge aggregator

---

## Phase 1: CCIP Bridge Configuration

### Files Modified

- **`smom-dbis-138/frontend-dapp/src/config/bridge.ts`**
  - Added `GNOSIS`, `CELO`, `WEMIX` to `CHAIN_SELECTORS`
  - Selectors: Gnosis `465200170687744372`, Celo `1346049177634351622`, Wemix `5142893604156789321`

- **`smom-dbis-138/config/bridge.config.example.ts`**
  - Added Gnosis Chain (100), Celo (42220), Wemix (1111) to `destinations`
  - Updated `allowedDestinations` in `allowedTokens` for both native ETH and WETH

- **`smom-dbis-138/docs/deployment/BRIDGE_CONFIGURATION.md`**
  - Updated Chain Selectors Reference table with Gnosis, Celo, Wemix

### Next Steps (Deployment) — completed in repo

To enable CCIP bridging to these chains, follow the runbook and script:

1. **Deploy** CCIPWETH9Bridge and CCIPWETH10Bridge on Gnosis, Celo, Wemix (per [CONFIG_READY_CHAINS_COMPLETION_RUNBOOK.md](../07-ccip/CONFIG_READY_CHAINS_COMPLETION_RUNBOOK.md)).
2. **Configure** destinations: run `smom-dbis-138/scripts/deployment/complete-config-ready-chains.sh` (adds Chain 138 ↔ Gnosis/Celo/Wemix bidirectionally).
3. **Fund** each bridge with LINK for CCIP fees (~10 LINK per bridge).

See [CONFIG_READY_CHAINS_COMPLETION_RUNBOOK.md](../07-ccip/CONFIG_READY_CHAINS_COMPLETION_RUNBOOK.md) and [ENV_CONFIG_READY_CHAINS.example](../../smom-dbis-138/docs/deployment/ENV_CONFIG_READY_CHAINS.example).

---

## Phase 2: Li.Fi Settlement Layer

### Files Modified

- **`alltra-lifi-settlement/src/config/chains.ts`**
  - Added `POLYGON` config (chain 137, USDC `0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359`)
  - Added `OPTIMISM` config (chain 10, USDC `0x0b2C639c533813f4Aa9D7837CAf62653d097Ff85`)
  - Updated `isSupportedInboundChain()` to include Polygon and Optimism

- **`alltra-lifi-settlement/docs/CHAIN_SUPPORT.md`**
  - Added Polygon and Optimism to support matrix
  - Added verification status for both chains

### Li.Fi Settlement Chains (Total: 5)

| Chain | Chain ID | Status |
|-------|----------|--------|
| Ethereum Mainnet | 1 | ✅ |
| Base | 8453 | ✅ |
| Arbitrum One | 42161 | ✅ |
| Polygon | 137 | ✅ |
| Optimism | 10 | ✅ |

---

## Phase 6: Go Bridge Aggregator

### Files Created

- **`explorer-monorepo/backend/bridge/lifi_provider.go`** – Li.Fi (40+ chains)
- **`explorer-monorepo/backend/bridge/socket_provider.go`** – Socket/Bungee (40+ chains)
- **`explorer-monorepo/backend/bridge/squid_provider.go`** – Squid Router/Axelar (50+ chains)
- **`explorer-monorepo/backend/bridge/symbiosis_provider.go`** – Symbiosis (30+ chains)
- **`explorer-monorepo/backend/bridge/relay_provider.go`** – Relay.link (EVM chains)
- **`explorer-monorepo/backend/bridge/stargate_provider.go`** – Stargate (LayerZero)

### Files Modified

- **`explorer-monorepo/backend/bridge/providers.go`**
  - Added all new providers to `NewAggregator()`
  - Removed inline Stargate placeholder (now in stargate_provider.go)

### Aggregator Provider Order

1. **LiFi** – 40+ chains, swap+bridge (✅ Implemented)
2. **Socket** – Bungee, 40+ chains (✅ Implemented)
3. **Squid** – Axelar-based, 50+ chains (✅ Implemented)
4. **Symbiosis** – 30+ chains (✅ Implemented)
5. **Relay** – Relay.link, EVM (✅ Implemented)
6. **Stargate** – LayerZero (✅ Implemented)
7. **CCIP** – Chainlink 138↔1 (✅ Implemented in ccip_provider.go)
8. **Hop** – Hop Protocol ETH↔L2 (✅ Implemented in hop_provider.go)

---

## Reference Updates

- **`docs/11-references/CHAINS_AND_PROTOCOLS_BRIDGE_INTEGRATION.md`**
  - Added Gnosis, Celo, Wemix to CCIP chains table
  - Added Polygon and Optimism to Li.Fi settlement table

---

## Verification

- Go bridge package compiles: `go build ./bridge/` ✅
- TypeScript chains config: No lint errors
- All destination configs use env vars for fee recipients

---

## References

- [CHAINS_AND_PROTOCOLS_BRIDGE_INTEGRATION.md](./CHAINS_AND_PROTOCOLS_BRIDGE_INTEGRATION.md)
- [BRIDGE_CONFIGURATION.md](../../smom-dbis-138/docs/deployment/BRIDGE_CONFIGURATION.md)
- [CHAIN_SUPPORT.md](../../alltra-lifi-settlement/docs/CHAIN_SUPPORT.md)
- [Li.Fi API](https://docs.li.fi/api-reference)
- [CCIP Supported Networks](https://docs.chain.link/ccip/supported-networks)