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I think you are referring to consensus..if you try to go back and add something to a prior block and transmit it to the network the other nodes will reject it..


how does a block know that its transactions have tampered with in the first place? It is not the block that knows this; it is the nodes which verify that. To quote the bitcoin whitepaper: When a node finds a proof-of-work, it broadcasts the block to all nodes. Nodes accept the block only if all transactions in it are valid and not already spent. ...


Blocks include more than just those 3 variables. One of the most important ones is the merkle root. This is the hash of all of the transactions in the block, in a particular order. If different transactions are included or they are included in a different order, that merkle root is going to be different. So if each miner has a different merkle root, then ...

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