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Suppose I created any ERC20 contract, how does etherscan recognise that the deployed contract is an ERC20?

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Metadata and ABI (Application Binary Interface): The contract's metadata and ABI can provide information about its functions and events. Etherscan can use this data to determine whether the contract adheres to a specific standard. ERC20, ERC721, and ERC1155 contracts have well-defined function signatures and events that can be recognized through the ABI.

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