Unspent Transaction Output (UTXO) is an important concept of a bitcoin network and other blockchains. It defines an output of a blockchain transaction that has not been spent.
UTXOs are referenced as inputs in a transaction and also used as output in a transaction on the network.
The concept of UTXo defines the inputs and outputs of transactions in the blockchain.
Source: Blockchain Basics, University at Buffalo, The State of New York
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