2019-12-17 12:04:46 -05:00
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# Unlocking Script
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2019-12-22 17:37:40 -05:00
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An unlocking script is a [Script](/protocol/blockchain/script) that is used to prove that a transaction is permitted to spend a given UTXO.
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This is accomplished by first executing the unlocking script and then executing the locking script for the UTXO referenced by the transaction input.
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If this execution triggers no failures and leaves a single non-zero (TRUE) value on the stack, the UTXO has been successfully unlocked.
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One way to look at this is that the unlocking script provides an initial state that acts as an inverse to the previously published locking script.
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For more information about how script execution works, see [Script](/protocol/blockchain/script).
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