UTXO, the unused balance of bitcoin
Sending and receiving bitcoins can be done by using a wallet.
In the case of bitcoin, you cannot send more than the amount of bitcoin you are managing.
In the case of bitcoin, to calculate the amount of bitcoin under your control, you have to calculate all of your past transactions.
The reason why this is done is because the minimum unit of bitcoin is not 1.
The minimum unit of bitcoin is 0.00000001BTC, which is called "1satoshi" after its inventor.
Therefore, it should be easy to divide it into units smaller than one.
However, processing all transactions for every 0.00000001 BTC is very inefficient, so usually multiple bitcoin transactions need to be processed together.
The transaction history can also be checked from time to time to ensure that no fraud has occurred.
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