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Mayank Kanela@mayankkanela#blockchain : A blockchain is nothing but an immutable record or transactions, a blockchain requires miner/nodes participating in the network to make it secure, the more no of nodes the more secure is the network, when a transaction happens it is verified by the nodes then put into a pool of transactions called a block, the person who gets the right to create the block gets the block reward, this is decided by a mechanism called a proof of work, in which the person has to solve a cryptographic puzzle using computers(in bitcoin blockchain).