Once the CPU effort has been expended to make it satisfy the proof-of-work, the block cannot be changed without redoing the work.
CPU의 노력으로 작업증명을 만족시킬 것으로 기대된다면, 그 블럭은 그 작업을 다시 하지 않고는 변경될 수 없을 것이다.
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