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Answer: The blockchain is a chain of blocks that shops all transactional facts in a period of time. Once the block enters the gadget it can’t be altered and the fraudulent records would be automatically rejected by using network users. However, if 51% of the miners are managed then a group of attackers can intervene with the manner of recording of new blocks. They can block different users transactions and reverse it also. It is additionally recognized as double spending. A community that would permit double spending ought to go through a loss of confidence. Then this type of assault is referred to as a 51% attack.