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One way the the immutability of the chain. Once a transaction is embedded (after enough validations and subsequent blocks) it becomes permanent. Nobody can ever change them. In that way, it is tough for someone to counterfeit currency.

Good comment but do you believe it would be harder to counterfeit or continue to attack like the most resent ones?

Because validated transactions are near impossible to undermine, the attackers are pursuing other methods, like man-in-the-middle attacks and private-key theft, to achieve their goals.