Unspent transaction outputs are used to determine whether a transaction is valid

English as a Second Language English Vocabulary, Grammar and Idioms
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#1

________________________________ are used to determine whether a transaction is valid. (*) Usual transaction outputs (*) Extra transaction outputs (*) Unspent transaction outputs (*) Spent transaction outputs

This is a companion discussion topic for the original entry at https://english.best/questions/23117,___-are-used-to-determine-whether-a-transaction-is-valid/
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#2

Extra transaction outputs are used to determine whether a transaction is valid