Chain ID

A Chain ID is a unique identifier assigned to a blockchain network, used to distinguish between different networks and prevent transaction replay attacks across chains. Each EVM chain has its own unique chain ID. This ensures that transactions intended for one network are not valid on another.

For developers, specifying the correct Chain ID is essential when configuring applications, deploying smart contracts, or conducting transactions to ensure interactions occur on the intended network. Misconfiguration of the Chain ID can lead to failed transactions or security vulnerabilities. Understanding and correctly implementing Chain IDs is fundamental for maintaining the integrity and security of blockchain applications.

Explore the chain IDs of EVM chains via thirdweb Chainlist →