A chain ID is a number used to identify a blockchain network, especially in EVM-compatible ecosystems.
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Short definition
Chain ID is a chain ID is a number used to identify a blockchain network, especially in EVM-compatible ecosystems.
Simple explanation
Wallets and apps use chain IDs to distinguish networks and prevent confusion between similar environments.
Why it matters
Correct chain ID settings help users avoid sending transactions on the wrong network.
Example context
Ethereum mainnet uses chain ID 1, while BNB Smart Chain uses chain ID 56.