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Deploying to mainnet means your contract goes live on the actual Ethereum blockchain. This is where real value is at stake!

Unlike testnets, transactions here cost real Ether (gas).

• Mainnet: The live, public blockchain network.
• Testnets: Simulated environments for testing without real financial risk.

Before deploying to mainnet, a thorough checklist is crucial. Remember, you can't easily change code once it's live!

• Audit Complete? Had your code reviewed by security experts?
• Tests Passed? All unit, integration, and fuzz tests are green?
• Gas Optimized? Have you minimized transaction costs?
• Dependencies Checked? All external contract addresses are correct?

Every operation on the Ethereum blockchain costs 'gas.' Gas is paid in Ether and covers the computational effort your contract uses.

High gas costs can make your contract expensive to use, deterring users. Optimizing gas saves money for your users and makes your contract more efficient.

Small changes can lead to big gas savings. Here are some key strategies:

• Minimize Storage Writes: Writing to storage (state variables) is very expensive.
• Use Efficient Data Types: Smaller types (e.g., uint8 instead of uint256 if range allows) can pack better.
• Cache Storage Variables: Read storage variables into memory if used multiple times in a function.
• Avoid Redundant Checks: Ensure your logic doesn't re-calculate or re-verify unnecessarily.

Let's see how caching a storage variable can save gas. In this example, reading myNumber into a local memory variable _myNumber before multiple uses is more efficient.

Verifying your contract on blockchain explorers like Etherscan is crucial. It publishes your source code, making it publicly auditable.

This builds trust with users, allowing them to confirm the code matches the deployed bytecode. It also helps other developers interact with your contract correctly.

The verification process typically involves:

1. Compiling your contract with the exact same Solidity compiler version and settings used for deployment.
2. Navigating to your contract's address on the blockchain explorer (e.g., Etherscan).
3. Selecting "Verify and Publish" and uploading your source code.
4. Providing constructor arguments, if any, encoded correctly.

Tools like Hardhat and Truffle often have plugins to automate this process.

Deployment isn't the end; it's the beginning of monitoring. You need to track your contract's activity to ensure it's functioning as expected and to detect any issues early.

Key things to monitor include transaction volume, contract balance, event emissions, and any unusual behavior.

Several powerful tools can help you monitor your deployed smart contracts:

• Blockchain Explorers (Etherscan): View transactions, internal transactions, events, and contract state.
• Tenderly: Provides real-time transaction monitoring, debugging, and alerts.
• Dune Analytics: Create dashboards to visualize contract data and user activity.
• Custom Bots/Scripts: Set up your own alerts for critical events or state changes.

You've deployed a new contract to mainnet. Which of the following is the primary reason to verify its source code on a blockchain explorer like Etherscan?

In this lesson, we covered crucial aspects of deploying smart contracts to mainnet. We explored:

• The importance of a pre-deployment checklist.
• Strategies for gas optimization to reduce transaction costs.
• The necessity of contract verification for transparency and trust.
• Tools and techniques for ongoing monitoring of your live contracts.

Deploying to mainnet is a significant step; always proceed with caution and thorough preparation!