Quick Summary

Deploying a smart contract to the same address on different blockchain networks is straightforward: use a dedicated wallet that's solely for deploying a specific smart contract. This method, utilized by Multicall3, ensures consistent contract addresses across networks.

Step-by-Step Guide Using Foundry

Step 1: Prepare a Dedicated Wallet

• Use a unique wallet address for deploying your smart contract. In this tutorial, we'll use:

    0x000006b92fb31c6854e9f598f2d0096da4d02de0
  

• Fund this wallet for deployment and ensure it's never been used on your target networks.

Step 2: Set Up Foundry

• Install Foundry following the official guide.

• Check your Forge version:

    ✦ forge --version
    forge 0.2.0 (8517446 2022-04-12T12:36:16.992513+00:00)
  

• Update to the latest version if needed:

    foundryup -b master
  

Step 3: Clone and Update the Example Project

• Clone the tutorial repository:

    git clone git@github.com:pyk/foundry-tutorial-same-address.git
    cd foundry-tutorial-same-address/
    forge update
  

Step 4: Deploy to Multiple Networks

Deploy to Rinkeby

• Run the deployment command:

    forge create --chain=rinkeby \
        --rpc-url <RPC_URL> \
        --optimize \
        --optimize-runs 200 \
        --private-key <PRIVATE_KEY> \
        src/SameAddress.sol:SameAddress
  

• Note the deployment result:

    Deployed to: 0x01bb3f43c855b80dd82ad6468c378aae73decc84
  

Verify on Rinkeby

• Verify the contract:

    forge verify-contract --chain-id=rinkeby \
        --compiler-version v0.8.13+commit.abaa5c0e \
        --num-of-optimizations 200 \
        0x01bb3f43c855b80dd82ad6468c378aae73decc84 \
        src/SameAddress.sol:SameAddress \
        <ETHERSCAN_API_KEY>
  

• Contract on Rinkeby: Etherscan Link

Deploy to Kovan

• Repeat the deployment process for Kovan:

    forge create --chain=kovan \
        --rpc-url <RPC_URL> \
        --optimize \
        --optimize-runs 200 \
        --private-key <PRIVATE_KEY> \
        src/SameAddress.sol:SameAddress
  

• Confirm the deployment result:

    Deployed to: 0x01bb3f43c855b80dd82ad6468c378aae73decc84
  

Step 5: Repeat and Confirm

• Repeat the deployment steps for other networks.

• You'll notice the contract address remains the same across networks:

    0x01bb3f43c855b80dd82ad6468c378aae73decc84
  

Conclusion

Deploying to multiple networks with the same address is quite simple using Foundry and a dedicated wallet.

Explore the tutorial repository here for more details. Happy deploying!