A type identifier selects the transaction payload format.
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Different form categories can use distinct field layouts under a common filing system.
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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.
Recognize typed framing
EIP-2718 defines a transaction-type envelope for specified payload formats. A typed transaction is not simply a legacy transaction with one arbitrary extra field.
Select the matching decoder
The type determines which schema and validity rules apply. Fee fields, access lists and other features differ among transaction types.
Keep signing rules aligned
The signed content belongs to the specific transaction format. Applying legacy signature assumptions to every typed transaction can misinterpret recovery or chain context.
Allow the format family to evolve
New types can be introduced through protocol changes. Check the intended fork instead of assuming a short tutorial list is exhaustive forever.
Map the protocol concept
typed transaction = type identifier || type-specific payload
legacy transaction = its legacy encoding
Choose schema before interpreting fields.
A conceptual model. Exact fields, limits and processing rules must be checked against the intended network fork.
QUICK CHECK · NO PRESSURE
Should every transaction type be decoded with the legacy field layout?
The envelope selects its specified payload schema.