Represents an input referencing an output.

### from(id, index): [UtxoInput](#utxoinput)

Create a new `UtxoInput`

| Parameter       | Type |  Description |
| --------------- | -------- | -------- |
| id | [TransactionId](#transactionid) |  The ouput Id |
| index | int |  The output Index |

### transactionId(): [TransactionId](#transactionid)

Returns the `TransactionId` of the Output.

### index(): int

Returns the index of the Output.