enter script – Required `script_sig` property for TxIn sort?

I am utilizing the bitcoin rust crate to construct my very own CLI pockets.

In my operate the place I am setting up the TxIn‘s for my Transaction, is the precise script_sig required on the under step? Or does it populate after I go and signal the transaction in a later step?

let txins: Vec = selected_utxos
        .iter()
        .map(|utxo| TxIn {
            previous_output: bitcoin::OutPoint {
                txid: bitcoin::Txid::from_str(&utxo.txid).anticipate("Invalid txid format"),
                vout: utxo.vout,
            },
            script_sig: ScriptBuf::new(),
            sequence: Sequence::MAX,
            witness: Witness::new(),
        })
        .gather();

Is it alright to put ScriptBuf::new() as a placeholder?

I am utilizing the bitcoin rust crate to construct my very own CLI pockets.

In my operate the place I am setting up the TxIn‘s for my Transaction, is the precise script_sig required on the under step? Or does it populate after I go and signal the transaction in a later step?

let txins: Vec = selected_utxos
        .iter()
        .map(|utxo| TxIn {
            previous_output: bitcoin::OutPoint {
                txid: bitcoin::Txid::from_str(&utxo.txid).anticipate("Invalid txid format"),
                vout: utxo.vout,
            },
            script_sig: ScriptBuf::new(),
            sequence: Sequence::MAX,
            witness: Witness::new(),
        })
        .gather();

Is it alright to put ScriptBuf::new() as a placeholder?