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Each block has a hash value that can be verified if it is legitimate and has not been injected by some hacker. Transactions on the blockchain are kept on track using this method. We use the hash to verify the blocks later; it provides legitimacy for a block once a hash is verified. Last, but surely not least, we owe Satoshi Nakamoto a heartfelt thank you for inventing what will surely be one of the greatest inventions of mankind. As discussed before, a blockchain contains all the blocks linked to each other, and our project needs a Chain class in order to keep all the blocks together in one place.