An interface specification supports interoperability, not universal safety.
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A standardized plug shape helps devices connect. It does not certify that every device using the plug is well made.
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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.
Standards define shared expectations
ERC interfaces describe function signatures, return shapes, events and behavior requirements. This helps wallets and applications work with multiple implementations without learning a completely new format each time.
Claiming compliance is not proof
A contract can expose familiar selectors while violating intended behavior. A website can label a token ERC-20 without establishing its implementation quality. Inspect code and relevant behavior for the claim being made.
A conforming interface still permits variety
Different tokens can have distinct issuance, administration, transfer restrictions and economic models. The same call shape does not guarantee the same real-world rights or value.
Design integrations around assumptions
A caller should identify which return values, transfer effects and metadata it relies on. The ABI and event labs teach interface mechanics, while safety reasoning requires the actual implementation context.