⚒️General Mitigation Steps

Awareness of Forks: Stay informed about upcoming Ethereum hard forks. Regularly monitoring Ethereum development can help you prepare for any significant changes that might affect your contracts.
Checking Chain ID: Implement checks within the contract to compare the current block.chainid with a stored chain ID. This ensures the contract is operating on the intended chain. The stored chain ID should be updated if a change is detected.
Dynamic Domain Separator: Implement a dynamic domain separator that will be recalculated if the current chain ID changes. This method, used in the provided code, helps to protect against replay attacks after a fork.
Use Trusted Libraries: Consider using trusted libraries like OpenZeppelin that have implemented mitigation strategies against such issues. For example, OpenZeppelin's EIP-712 implementation includes a mechanism to update the domain separator if the chain ID changes.
Testing and Auditing: After implementing these mitigation strategies, thoroughly test and audit your contracts to ensure they behave as expected when the chain ID changes. This should include testing how your contracts behave on testnets that simulate hard forks.
Emergency Pause Mechanism: As a last resort, consider implementing an emergency pause mechanism in your contracts. This could allow you to stop all contract activities in the event of a hard fork until you can ensure that everything works as expected on the new chain.

These steps can help you protect your contracts against the potential issues that could arise from a change in block.chainid due to a hard fork.

Last updated 1 year ago