when you decide to spend your bitcoin you only see the amount you ve spent deducted and the amount left over in your wallet for you it s similar to using a 1 bill on a 50 item you re given change you put it in your pocket and go about your day 
goals of the utxo modelthe utxo model is used in many cryptocurrencies because it allows users to track ownership of all portions of that cryptocurrency because cryptocurrencies were created with anonymity in mind utxos are associated with the public addresses visible to the entire network users cannot be identified from their ownership unless they advertise their address but the model allows for transparency through the addresses a transaction encodes the transfer of value from the fund source your input to the destination the output or the recipient advantages and disadvantages of the utxo modelthere are several advantages to the utxo model some of the disadvantages of the model are 