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Smart Contract Development Guidelines on Core Chain

Core Chain is constantly evolving for better user and developer experience. This document aims to provide clear instructions for developers on the supported Solidity versions and the necessary settings to ensure your smart contracts are correctly deployed and verifiable on the Core Chain network. To maintain consistency and compatibility, Core Chain supports Solidity versions higher than 0.8.19 using the Paris EVM. Adhering to this specified version and configuration guidelines is crucial for the seamless functioning of your contracts. The following sections will detail the recommended Solidity settings, including compiler options and verification procedures, to help you achieve a smooth and secure contract deployment on Core Chain.

Background​

At the moment, Core's EVM matches version Paris and does not support the deployment and verification of smart contracts of version 0.8.20^ with default EVM settings. Core is upgrading to the latest version of EVM and is projected to finish by early of Q3 2024.

Configurations to Correctly Deploy Smart Contracts on Core​

To make sure that the lag in support for deployment and verification of smart contracts of version 0.8.20^ does not stagger the developement of dapps on the Core Chain, following are the guidelines to ensure that developers can successfully deploy and verify smart contracts of version 0.8.20^ on Core before the Core EVM upgrade.

EVM Settings​

In order to support running smart contracts with Solidity version 0.8.20^, Developers should not use the default EVM settings to compile the smart contracts. Instead, they need to pick the most recent version before Shanghai, which is Paris.

Hardhat​

  • Please add evmVersion: "paris" in solidity comppiler configurations.

hardhat-solidity-setting

Remix​

  • Please choose paris in Compiler configuration.

remix-solidity-setting

Contract Verification​

  • In order to make the verification process easier, Core scan has changed the platform default EVM version to Paris for solidity version 0.8.20^.
  • Developers can take the exact same steps to verify their smart contracts with version 0.8.20^ as of the older versions, refer here for more details on contract verification on Core Chain.

Smart Contracts Based on Solidity version < 0.8.20​

  • Note that for smart contracts with solidity version < 0.8.20 are not affected by this and can operate as usual.