Figure $2$ illustrates the UTXO set, initially containing three unspent transactions in the network

$($TxOUT: $0-1$ to TxOUT: $0-3).$ The UTXO set holds these three TxOUTs. Subsequently, Block$-1$

is generated, encompassing two transactions $($TX$1$ and TX$2).$ These transactions expend the three

TxOUTs from the initial UTXO set and generate a new UTXO set. Specify this updated UTXO

set after the creation of Block$-1.$ Similarly, articulate the subsequent UTXO set following the

creation of Block$-2.$

Figure $2$: Unspent transaction outputs $($UTXO$)$