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Omnichain Deployer

A hardhat plugin that allows developers to deploy contracts to exact same addresses and verify them on multiple networks (Layer 2 or any EVM compatible network) with few commands.

Omnichain Deployer

Created At

Scaling Ethereum 2024

Winner of


Morph - Runner Ups

Project Description

Introducing Omnichain Deployer, a hardhat plugin simplifying the deployment of contracts across multiple networks, including Layer 2 and any EVM-compatible network, with just a few commands.

To facilitate cross-chain dApp development, Omnichain Deployer ensures contracts are deployed to the exact same addresses on each network, reducing confusion for both developers and users. Here's how it works:

  • Generate Deployer Account: Use the "generate-deployer" command to create a deployer EOA (Externally Owned Account). This account is encrypted and saved as a .json file, ready to be used by browser wallet applications like Metamask.
  • Fund Deployer Account: With the "fund-deployer" command, developers can fund the deployer account on multiple networks. This command requires contract and constructor arguments as input, calculates the necessary gas, and sends the funds to the deployer account. A funder account needs to be defined in the configuration file for this to work.
  • Omnichain Deploy: Execute the "omnichain-deploy" command to deploy contracts across all configured networks. This command runs the usual deployment script provided by the developer on the desired networks.
  • Contract Verification: After deployment, developers can verify their contracts on all relevant explorers using the "omnichain-verify" command.
  • Additionally, developers can utilize the "check-balances" and "get-private-key" commands for further functionalities.

By following this approach, developers can write their deployment script once and deploy it across multiple networks effortlessly. Omnichain Deployer makes deploying dApps across multiple chains as straightforward as deploying on a single network.

How it's Made

This project utilizes the Hardhat Runtime Environment for deploying and verifying smart contracts, along with the ethers library for various tasks such as estimating deployment gas, sending funds, checking balances, generating accounts, and encrypting/decrypting them. It's a command-line tool and relies on 'chalk' and 'prompt-sync' for user interaction, such as asking for passwords, logging, and displaying error messages.

Changing the network on the Hardhat Runtime Environment during runtime posed some challenges. While sending funds didn't involve HRE directly, deployment and verification tasks required constant network changes. Directly manipulating didn't work, so an alternative approach was taken using hre.hardhatArguments to change the network for deployment and running terminal commands with 'child_process' for verifying.

To calculate deployment costs, several pieces of information were needed: the gas required for the transaction and the gas price. This was achieved by using the ethers library. Contract and constructor arguments were taken as inputs, a deployment transaction was generated, and the gas estimation was extracted from this data. The gas price was obtained from the provider of the network to be deployed to, using fee data. To ensure successful deployment transactions, 1.5 times the deployment cost was declared to be sent from the developer's funder account to the deployer account.

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