Function check_maturity_height 

fn check_maturity_height(
    tx: Arc<Transaction>,
    height: Height,
    network: &Network,
    spent_utxos: &HashMap<OutPoint, Utxo>,
) -> Result<(), TransactionError>

Checks that every transparent coinbase output spent by tx has matured by height.

This check applies only to mempool transactions. Block transactions are checked during contextual validation in the state (see #2336).

Calls check::tx_transparent_coinbase_spends_maturity with an empty block_new_outputs map, since mempool transactions have no block context.

Returns Ok(()) if every transparent coinbase output spent by the transaction is mature and valid for the given height, or a TransactionError if the transaction spends transparent coinbase outputs that are immature and invalid for the given height.