UTXO (Unspent Transaction Output)
Also known as: Unspent Transaction Output
The output of a blockchain transaction that hasn’t yet been spent, used in accounting for cryptocurrencies like Bitcoin.
A UTXO (Unspent Transaction Output) is a discrete chunk of cryptocurrency received in a transaction that remains unspent until used as input in a new transaction. UTXOs form the foundational accounting model for Bitcoin and other UTXO-based chains, enabling secure verification, parallel transaction processing, and precise balance tracking. Wallets track UTXOs per address, and transactions consume one or more UTXOs and generate new ones. UTXO model contrasts with account-based models (like Ethereum) and facilitates features like coin selection and privacy.