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BLOCKCHAIN (Secured transaction) What is a Blockchain? Blockchain is a distributed and decentralized digital ledger which records transactions across a global network of computers where the information is highly secure. We can also think of it as a chain or records stored in the forms of blocks which are controlled by no single authority. A blockchain is a distributed ledger that is completely open to any and everyone on the network . Once an information is stored on a blockchain, it is extremely difficult to change or alter it . How Does a Blockchain Work? A blockchain is a chain of blocks that contain data or information . Each block in a blockchain network stores some information along with the hash of its previous block. A hash is a unique mathematical code which belongs to a specific block . If the information inside the block is modified, the hash of the block will be subj