I don’t understand how that makes the the system so secure. If a new block is added by someone, it is automatically sent to all nodes to keep a record. So couldn’t someone tamper with a block and manipulate the network just as easily? What I mean is, why is it so easy to have the ledger updated with legitimate transactions, but supposedly so difficult to update with fraudulent transactions?
Well, nothing prevents you from sending a tampered block to everyone on the network. But each node that receives your block will validate it and reject it straight away. They can do this because they check every bit of information inside your block. Is the hash correct? is the proof-of-work correct? Are the transactions valid or not? etc…
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