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In short, yes. The prev_out field is a field of the transaction, AND part of the transaction which gets signed. Note that not all fields in a transaction are signed. What is signed depends on the SIGHASH_FLAG. Additionally, since each input has its own signature(s), the same fields/data are not signed for each signature in a transaction. Signature Creation ...


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If you read about Hal Finney's Reusable Proof-of-Work (RPOW), you'll see many similarities to UTXOs. RPOW was a prototype network where individuals created tokens using a similar PoW system to the one Bitcoin uses. These tokens could be signed over to other users (keys), just like bitcoin.


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