Unspent Transaction Output

What Is an Unspent Transaction Output (UTXO)?

It is a transaction that is completed but remains unspent is analogous to having leftover change even after making a purchase. Bitcoin is the most well-known example of a cryptocurrency that employs this model. Unspent transaction output, or UTXO, is a cryptocurrency term that refers to the result of a blockchain transaction that has not been utilized as an input in a new transaction.

Exploring the Full Scope of Unspent Transaction Output (UTXO)

Each bitcoin transaction has input as well as an output. The input address is where the bitcoin is coming from, and the output address is where it is sent off. The user owns the result of a transaction and can spend it in another transaction later. On the contrary, bank accounts register debits and credits and deliver a monthly statement with a running balance to the account holder. 

The overall wealth or balance in a wallet, according to the UTXO model, is the total of all unspent transaction outputs. It is the bitcoin equivalent of receiving change after making one or even more transactions, which can then be used to make more purchases.

Understanding Unspent Transaction Output (UTXO) Through an Example

For instance, John has ten coins and wishes to send Susan two pennies. John's wallet initially unlocks the 10-coin UTXOs and then uses all ten coins as transaction input. Two coins are transmitted to Susan's address, whereas the remaining eight coins are returned to John as a new UTXO to a freshly formed address. 

If Susan held three coins just before the transaction, her wallet now maintains two UTXOs: one is from before, and one is from John's transaction. The overall inputs must meet or surpass the overall outputs in the UTXO model. This is one of the fundamental checks validators perform to determine the validity of a transaction. 

The disadvantage of UTXO is that the abundance of small coins inside a cryptocurrency's network renders certain transactions uneconomic. This is because the transaction may cost more than the real cost of the object being purchased using bitcoin.