Blockchain is a decentralized digital ledger that stores data in a way that makes it difficult to alter or manipulate. It consists of a network of computers, each of which contains a copy of the blockchain. The computers communicate with each other to maintain a consistent and accurate record of all transactions on the network. Each block in the blockchain contains a cryptographic hash of the previous block, a timestamp, and transaction data. Once a block is added to the chain, it cannot be a...