blockchain – Why does mining / validation of recent blocks must be difficult / time consuming?

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Why does mining / validation of recent blocks must be difficult / time consuming ?
Why it may well’t be so simple as simply discover a hash for a textual content?
Is it simply to manage / restrict the quantity of recent crypto volumes coming in ? If so, is not it an power consumption situation ? Aren’t there another options ?

Sorry for asking too many questions. I’m only a bit confused.



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