# Multichain Deployment Runbook

**Last Updated**: 2025-01-27
**Purpose**: Comprehensive guide for deploying smart contracts to multiple chains using Foundry

## Overview

This runbook covers deployment of the complete contract suite to:
- **Ethereum Mainnet** (chainId 1): Only CCIPLogger (other contracts already deployed)
- **Cronos** (chainId 25): All contracts
- **BSC** (chainId 56): All contracts
- **Polygon PoS** (chainId 137): All contracts
- **Gnosis Chain** (chainId 100): All contracts

## Prerequisites

### 1. Environment Setup

1. **Copy environment template**:
   ```bash
   cp .env.example .env
   ```

2. **Fill in all required variables** in `.env`:
   - `PRIVATE_KEY`: Your deployer private key
   - RPC URLs for all chains
   - Explorer API keys for verification
   - CCIP router addresses per chain
   - LINK token addresses per chain

3. **Verify Foundry installation**:
   ```bash
   forge --version
   # Should be >= 0.2.0
   ```

4. **Install dependencies** (if using Hardhat for CCIPLogger):
   ```bash
   npm install
   npm install @openzeppelin/contracts@5.0.2
   npm install @chainlink/contracts-ccip
   ```

### 2. Verify Configuration

Check that all environment variables are set:
```bash
# Check mainnet config
echo $ETH_MAINNET_RPC_URL
echo $CCIP_ETH_ROUTER
echo $CCIP_ETH_LINK_TOKEN

# Check other chains
echo $CRONOS_RPC_URL
echo $BSC_RPC_URL
echo $POLYGON_RPC_URL
echo $GNOSIS_RPC_URL
```

### 3. Get Real-Time Gas Prices

Before checking balances, fetch real-time gas prices:

```bash
# Fetch real-time gas prices for all chains
./scripts/deployment/get-multichain-gas-prices.sh

# Update documentation with real-time prices
./scripts/deployment/update-gas-estimates.sh
```

This will:
- Fetch current gas prices from configured APIs
- Calculate deployment costs for all chains
- Update documentation with real-time estimates
- Show you exactly how much you need

### 4. Verify Wallet Balance

Ensure your deployer wallet has sufficient native tokens for gas:
```bash
# Check balances (adjust RPC URLs as needed)
cast balance $DEPLOYER_ADDRESS --rpc-url $ETH_MAINNET_RPC_URL
cast balance $DEPLOYER_ADDRESS --rpc-url $CRONOS_RPC_URL
cast balance $DEPLOYER_ADDRESS --rpc-url $BSC_RPC_URL
cast balance $DEPLOYER_ADDRESS --rpc-url $POLYGON_RPC_URL
cast balance $DEPLOYER_ADDRESS --rpc-url $GNOSIS_RPC_URL
```

**Recommended minimum balances** (see [Gas and Token Requirements](./GAS_AND_TOKEN_REQUIREMENTS.md) for details):
- Ethereum Mainnet: **0.20 ETH** (for CCIPLogger deployment)
- Cronos: **15 CRO** (for all 5 contracts)
- BSC: **0.06 BNB** (for all 5 contracts)
- Polygon: **1.0 MATIC** (for all 5 contracts)
- Gnosis: **0.05 xDAI** (for all 5 contracts)

**Total Estimated Cost**: ~$520 USD (with buffers)

---

## Deployment Commands

### Ethereum Mainnet - CCIPLogger Only

**Status**: WETH9, WETH10, CCIPWETH9Bridge, CCIPWETH10Bridge are already deployed.

**Deploy CCIPLogger**:

```bash
# Option 1: Using Foundry (if CCIPLogger is compatible)
forge script script/DeployCCIPLoggerOnly.s.sol:DeployCCIPLoggerOnly \
  --rpc-url mainnet \
  --chain-id 1 \
  --private-key $PRIVATE_KEY \
  --broadcast \
  --verify \
  -vvvv

# Option 2: Using Hardhat (recommended for CCIPLogger)
npm install @openzeppelin/contracts@5.0.2
npx hardhat run scripts/ccip-deployment/deploy-ccip-logger.js --network mainnet
```

**Verify CCIPLogger**:
```bash
# If deployed via Foundry, verification is automatic with --verify flag
# If deployed via Hardhat:
npx hardhat verify --network mainnet \
  <CCIPLOGGER_ADDRESS> \
  "$CCIP_ETH_ROUTER" \
  "$AUTHORIZED_SIGNER" \
  "$CHAIN138_SELECTOR"
```

---

### Cronos (Chain ID 25)

**Deploy all contracts**:

```bash
forge script script/DeployAll.s.sol:DeployAll \
  --rpc-url cronos \
  --chain-id 25 \
  --private-key $PRIVATE_KEY \
  --broadcast \
  --verify \
  -vvvv
```

**Verify contracts** (if automatic verification fails):
```bash
# WETH9
forge verify-contract \
  --chain-id 25 \
  --num-of-optimizations 200 \
  --watch \
  <WETH9_ADDRESS> \
  contracts/tokens/WETH.sol:WETH \
  $CRONOSCAN_API_KEY

# WETH10
forge verify-contract \
  --chain-id 25 \
  --num-of-optimizations 200 \
  --watch \
  <WETH10_ADDRESS> \
  contracts/tokens/WETH10.sol:WETH10 \
  $CRONOSCAN_API_KEY

# CCIPWETH9Bridge
forge verify-contract \
  --chain-id 25 \
  --num-of-optimizations 200 \
  --watch \
  <BRIDGE_ADDRESS> \
  contracts/ccip/CCIPWETH9Bridge.sol:CCIPWETH9Bridge \
  $CRONOSCAN_API_KEY \
  --constructor-args $(cast abi-encode "constructor(address,address,address)" $CCIP_CRONOS_ROUTER $WETH9_ADDRESS $CCIP_CRONOS_LINK_TOKEN)

# CCIPWETH10Bridge
forge verify-contract \
  --chain-id 25 \
  --num-of-optimizations 200 \
  --watch \
  <BRIDGE_ADDRESS> \
  contracts/ccip/CCIPWETH10Bridge.sol:CCIPWETH10Bridge \
  $CRONOSCAN_API_KEY \
  --constructor-args $(cast abi-encode "constructor(address,address,address)" $CCIP_CRONOS_ROUTER $WETH10_ADDRESS $CCIP_CRONOS_LINK_TOKEN)
```

---

### BSC (Chain ID 56)

**Deploy all contracts**:

```bash
forge script script/DeployAll.s.sol:DeployAll \
  --rpc-url bsc \
  --chain-id 56 \
  --private-key $PRIVATE_KEY \
  --broadcast \
  --verify \
  -vvvv
```

**Verify contracts** (if automatic verification fails):
```bash
# Similar to Cronos, but use BSCSCAN_API_KEY
forge verify-contract \
  --chain-id 56 \
  --num-of-optimizations 200 \
  --watch \
  <CONTRACT_ADDRESS> \
  <CONTRACT_PATH>:<CONTRACT_NAME> \
  $BSCSCAN_API_KEY \
  --constructor-args <ENCODED_ARGS>
```

---

### Polygon PoS (Chain ID 137)

**Deploy all contracts**:

```bash
forge script script/DeployAll.s.sol:DeployAll \
  --rpc-url polygon \
  --chain-id 137 \
  --private-key $PRIVATE_KEY \
  --broadcast \
  --verify \
  -vvvv
```

**Verify contracts** (if automatic verification fails):
```bash
# Use POLYGONSCAN_API_KEY
forge verify-contract \
  --chain-id 137 \
  --num-of-optimizations 200 \
  --watch \
  <CONTRACT_ADDRESS> \
  <CONTRACT_PATH>:<CONTRACT_NAME> \
  $POLYGONSCAN_API_KEY \
  --constructor-args <ENCODED_ARGS>
```

**Note**: Polygon CCIP Router is available at `0x3C3D92629A02a8D95D5CB9650fe49C3544f69B43`

---

### Gnosis Chain (Chain ID 100)

**Deploy all contracts**:

```bash
forge script script/DeployAll.s.sol:DeployAll \
  --rpc-url gnosis \
  --chain-id 100 \
  --private-key $PRIVATE_KEY \
  --broadcast \
  --verify \
  -vvvv
```

**Verify contracts** (if automatic verification fails):
```bash
# Use GNOSISSCAN_API_KEY
forge verify-contract \
  --chain-id 100 \
  --num-of-optimizations 200 \
  --watch \
  <CONTRACT_ADDRESS> \
  <CONTRACT_PATH>:<CONTRACT_NAME> \
  $GNOSISSCAN_API_KEY \
  --constructor-args <ENCODED_ARGS>
```

---

## Post-Deployment Steps

### 1. Save Deployment Addresses

After each deployment, save the addresses to your `.env` file:

```bash
# Example for Cronos
echo "WETH9_CRONOS=<deployed_address>" >> .env
echo "WETH10_CRONOS=<deployed_address>" >> .env
echo "CCIPWETH9BRIDGE_CRONOS=<deployed_address>" >> .env
echo "CCIPWETH10BRIDGE_CRONOS=<deployed_address>" >> .env
echo "CCIPLOGGER_CRONOS=<deployed_address>" >> .env
```

### 2. Verify All Contracts

Verify all contracts on their respective explorers:
- [Etherscan](https://etherscan.io) (Mainnet)
- [Cronoscan](https://cronoscan.com) (Cronos)
- [BscScan](https://bscscan.com) (BSC)
- [Polygonscan](https://polygonscan.com) (Polygon)
- [Gnosisscan](https://gnosisscan.io) (Gnosis)

### 3. Configure Bridge Destinations

For each bridge contract, configure destination chains:

```bash
# Example: Configure WETH9 Bridge on Cronos to send to Mainnet
cast send <CCIPWETH9BRIDGE_CRONOS> \
  "addDestination(uint64,address)" \
  $ETH_MAINNET_SELECTOR \
  $CCIPWETH9BRIDGE_MAINNET \
  --rpc-url cronos \
  --private-key $PRIVATE_KEY
```

### 4. Test Cross-Chain Transfers

Test a small cross-chain transfer to verify everything works:

```bash
# Example: Send WETH9 from Cronos to Mainnet
cast send <WETH9_CRONOS> \
  "approve(address,uint256)" \
  <CCIPWETH9BRIDGE_CRONOS> \
  1000000000000000000 \
  --rpc-url cronos \
  --private-key $PRIVATE_KEY

cast send <CCIPWETH9BRIDGE_CRONOS> \
  "sendCrossChain(uint64,address,uint256)" \
  $ETH_MAINNET_SELECTOR \
  <RECIPIENT_ADDRESS> \
  1000000000000000000 \
  --rpc-url cronos \
  --private-key $PRIVATE_KEY
```

---

## Gas and Token Requirements

**📊 For detailed gas cost breakdowns and token requirements, see**: [Gas and Token Requirements](./GAS_AND_TOKEN_REQUIREMENTS.md)

### Quick Reference: Minimum Balances

| Chain | Token | Minimum | Recommended |
|-------|-------|---------|-------------|
| **Mainnet** | ETH | 0.15 ETH | **0.20 ETH** |
| **Cronos** | CRO | 8.76 CRO | **15 CRO** |
| **BSC** | BNB | 0.044 BNB | **0.06 BNB** |
| **Polygon** | MATIC | 0.44 MATIC | **1.0 MATIC** |
| **Gnosis** | xDAI | 0.0175 xDAI | **0.05 xDAI** |

### Total Gas Requirements

- **Ethereum Mainnet**: 3,000,000 gas (CCIPLogger only)
- **Other Chains**: 8,760,000 gas (all 5 contracts: WETH9, WETH10, 2 Bridges, CCIPLogger)

---

## Gas Price Strategies

### Ethereum Mainnet
- **Strategy**: Use EIP-1559 (automatic)
- **Max Fee**: Check current gas prices
- **Priority Fee**: 2-5 gwei

### Cronos
- **Strategy**: Fixed gas price
- **Gas Price**: ~500 gwei (very low)
- **Note**: Cronos uses CRO for gas

### BSC
- **Strategy**: Fixed gas price
- **Gas Price**: ~3-5 gwei
- **Note**: BSC uses BNB for gas

### Polygon
- **Strategy**: Fixed gas price
- **Gas Price**: ~30-100 gwei
- **Note**: Polygon uses MATIC for gas

### Gnosis
- **Strategy**: Fixed gas price
- **Gas Price**: ~1 gwei
- **Note**: Gnosis uses xDAI for gas

---

## Network-Specific Caveats

### Cronos
- **Finality**: ~6 seconds
- **CCIP Support**: Verify CCIP router availability
- **RPC**: May have rate limits

### BSC
- **Finality**: ~3 seconds
- **CCIP Support**: Verify CCIP router availability
- **Gas**: Very cheap, but watch for congestion

### Polygon
- **Finality**: ~2 seconds
- **CCIP Support**: ✅ Available
- **Router**: `0x3C3D92629A02a8D95D5CB9650fe49C3544f69B43`
- **LINK Token**: `0x53E0bca35eC356BD5ddDFebbD1Fc0fD03FaBad39`

### Gnosis
- **Finality**: ~5 seconds
- **CCIP Support**: Verify CCIP router availability
- **Gas**: Very cheap

---

## Troubleshooting

### RPC Connection Issues

```bash
# Test RPC connectivity
cast block-number --rpc-url $ETH_MAINNET_RPC_URL
cast block-number --rpc-url $CRONOS_RPC_URL
cast block-number --rpc-url $BSC_RPC_URL
cast block-number --rpc-url $POLYGON_RPC_URL
cast block-number --rpc-url $GNOSIS_RPC_URL
```

### Contract Verification Fails

1. **Check compiler settings match**:
   ```bash
   # Verify optimizer settings
   grep optimizer foundry.toml
   grep optimizer_runs foundry.toml
   ```

2. **Verify constructor arguments**:
   ```bash
   # Encode constructor args manually
   cast abi-encode "constructor(address,address,address)" \
     $ROUTER $WETH $LINK
   ```

3. **Use explicit verification**:
   ```bash
   forge verify-contract \
     --chain-id <CHAIN_ID> \
     --num-of-optimizations 200 \
     --watch \
     <ADDRESS> \
     <CONTRACT_PATH>:<CONTRACT_NAME> \
     <API_KEY> \
     --constructor-args <ENCODED_ARGS>
   ```

### CCIPLogger Deployment Issues

If CCIPLogger fails to deploy via Foundry:
1. Use Hardhat script instead: `npm run deploy:logger:mainnet`
2. Ensure OpenZeppelin v5.0.2+ is installed
3. Check that CCIP contracts are available

---

## Deployment Checklist

### Pre-Deployment
- [ ] Environment variables configured
- [ ] Wallet balances sufficient
- [ ] RPC endpoints tested
- [ ] Contracts compile successfully
- [ ] Tests pass

### Deployment
- [ ] Ethereum Mainnet: CCIPLogger deployed
- [ ] Cronos: All contracts deployed
- [ ] BSC: All contracts deployed
- [ ] Polygon: All contracts deployed
- [ ] Gnosis: All contracts deployed

### Post-Deployment
- [ ] All contracts verified on explorers
- [ ] Deployment addresses saved to `.env`
- [ ] Bridge destinations configured
- [ ] Cross-chain transfers tested
- [ ] Monitoring set up

---

## Support

For issues or questions:
- Check deployment logs
- Review contract documentation
- Verify configuration
- Check troubleshooting section above

---

## References

- [Foundry Documentation](https://book.getfoundry.sh/)
- [Chainlink CCIP Documentation](https://docs.chain.link/ccip)
- [Etherscan API](https://docs.etherscan.io/)
- [Multichain Deployment Script](../script/DeployAll.s.sol)
- [CCIPLogger Deployment Script](../script/DeployCCIPLoggerOnly.s.sol)