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proof of labor – What stage of the bitcoin protocol offers (or ‘solves’) the double-spend downside?


I perceive {that a} key innovation in bitcoin is that it solves a key downside confronted by earlier makes an attempt at a digital foreign money: the double-spend downside.

As well as, I additionally perceive that the bitcoin protocol includes a number of steps, from the second a transaction is broadcasted to when the transaction has been included in a legitimate block of the bitcoin blockchain.

At what stage does the bitcoin protocol tacked the double-spend downside? E.g., can the ‘answer’ be attributed to the proof-of-work mechanism or is it sort out by a number of parts?

EDIT: I’m considering of the bitcoin protocol in ‘levels’. However do right me if that is the incorrect framing.

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