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title: 3. empty check note: ``` pub struct TransactionData { pub kind: TransactionKind, sender: SuiAddress, gas_payment: ObjectRef, pub gas_price: u64, pub gas_budget: u64, } ``` Sponsor -> User: Gas data `ObjectRef`, `price`, `budget` etc User -> User: construct TransactionData with Gas data, sign User -> Sponsor: TransactionData and user sig Sponsor -> Sponsor: check tx, sign TransactionData Sponsor -> FullNode: submit dual signed transaction