blockchain – Why should your entire chain be included in calculations if it is already been validated. Why cannot the validated parts be archived to save lots of power?

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I am new to this so do not snicker. If the entire earlier transactions in a blockchain have been validated as genuine, why does your entire chain must be carried ahead within the calculations? Why cannot the validated parts be hashed and archived to save lots of power prices from dealing with a lot historic knowledge. When accountants calculate the present years earnings, they do not return to when the corporate began and add up each earnings and expense merchandise, they only add the present years outcomes to the archived previous totals. What am I lacking.



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