CellInput
Input Cells are the output Cells of previous transactions, hence they are noted as previous_output.
| Name | Type | Description | 
|---|---|---|
| previous_output | OutPoint | A Cell outpoint pointing to the Cells used as inputs. For more, see previous_outputbelow. | 
| since | Uint64 | Since value guarding current referenced inputs. Please refer to RFC: Transaction Since Precondition for details. |