Chain Documentation 2017 (†840)Chain Docs. "Unspent Outputs Guide." (Chain, 2017).
- unspent transaction output (UTXO) : Each new transaction in the blockchain consumes some unspent outputs and creates others. An output is considered unspent when it has not yet been used as an input to a new transaction. All asset units on a blockchain exist in the unspent output set. (†2213)