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The blockchain technology requires nodes/miners to validate and add to the existing chain.  All transactions will be checked and validated by the miners based on the previous chain.  This requires a unanimous agreement from all miners in a network.  The new record is then added to the existing chain.  Thus, any unilateral attempt to change a chain will not be approved by other miners in the network, and the transaction will not be recognised.  For doing all that, a miner is rewarded with a or fraction of virtual coin.  That is the basic and short summary of blockchain technology.

If people can manipulate the blockchain technology, then all cryptocurrencies wouldn't be safe to hold. This is actually the case when Cryptocurrency are subject of constant hacks but now, it's very hard to hack any cryptocurrency blockchain. 

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