A valid word can support several different interpretations.
LET’S PICTURE IT
A box containing the number one does not say whether it means one ticket, true, or an account ending in one.
SEE IT FOR YOURSELF
Build a transfer call from typed fieldsStep 1 / 4
The standard transfer interface takes an address and a raw integer amount. This diagram uses address one and amount one hundred.
The standard transfer interface takes an address and a raw integer amount. This diagram uses address one and amount one hundred.Keccak-256 of the canonical signature supplies the first four bytes. The transfer selector is a9059cbb.An address is twenty bytes. Standard ABI encoding adds twelve zero bytes on the left to fill one thirty-two-byte word.The integer one hundred is hex 64, left-padded in word one. Selector plus two words produces sixty-eight bytes of standard calldata.
Animated local teaching model. No wallet, RPC or live blockchain data. Some labels and hashes are abbreviated for readability.
The bytes carry no universal type tags
Ordinary ABI arguments rely on an external schema. A zero-padded word ending in 01 can represent a positive integer, true under a bool schema, or an address whose value ends in one.
Length does not solve semantics
Several static schemas can occupy the same number of bytes. A decoder can therefore produce a plausible result under a schema that was not the intended one.
Selectors narrow a request, not every uncertainty
A four-byte selector is useful dispatch information but can collide. It does not certify the target implementation or automatically reveal token decimal conventions.
Use trusted context
Choose the correct function or output ABI and retain the call outcome and network context. The lab decodes what you supply; it does not claim to discover truth from arbitrary hex alone.