Why are there 2 inputs for OTC predicate example?

tsk · June 22, 2023, 1:07am

Can someone explain why there are 2 inputs for OTC predicate example?

1 input from caller, where does the other one come from?

FuelLabs/sway-applications/blob/5431f0ae8674175b162e3754efc996285cb04b28/OTC-swap-predicate/project/predicates/swap-predicate/src/main.sw#L31-L38


      
          // Check if the transaction contains a single input coin from the receiver, to cancel their own order (in addition to this predicate)
          if input_count() == 2u8 {
              if input_owner(0).unwrap() == RECEIVER
                  || input_owner(1).unwrap() == RECEIVER
              {
                  return true;
              };
          };

david · June 22, 2023, 3:30pm

One input comes from the receiver (the creator of the order), which is likely ETH to pay gas.

The other input is the asset held by the predicate.

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Why are there 2 inputs for OTC predicate example?

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