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Irish Independent - Business Week - - TECHNOLOGY -

HOW does the sys­tem pre­vent cheat­ing? Be­cause every block contains data link­ing to ear­lier blocks, an at­tempt to spend the same Bit­coin twice would mean re­vis­ing many links in the chain. Plus, as min­ers com­pete, they ver­ify each other’s work each step of the way.

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