Understanding Ethereum Calldata and Bytecode: how the EVM knows which function to call

When you send a transaction to a smart contract, you’re not sending “commands”, you’re sending raw bytes that tell the EVM exactly which function to execute and with what arguments.I wrote a breakdown that walks step-by-step through:How the 4-byte function selector is derived from the function signatureHow arguments are ABI-encoded into 32-byte slotsHow the EVM matches that selector to the correct functionWhat the compiled bytecode looks like under the hoodWhat happens when the transaction runs through the EVMIt includes real calldata examples, decoded transactions, and bytecode snippets from a simple Solidity contract.If you’ve ever seen a transaction’s data field and wondered what it really means this will make it click.👉 Ethereum Calldata and Bytecode: How the EVM Knows Which Function to CallWould love to hear how others here inspect calldata or debug input decoding, do you use Foundry’s cast calldata, Tenderly, or custom scripts? via /r/eth https://ift.tt/0NjqFmK