What blockchain really is?

A blockchain is a type of Digital Ledger Technology (DLT) 📒 that consists of growing list of records, called blocks, that are securely linked together using cryptography. Each block contains a cryptographic hash of the previous block 🧱, a timestamp, and transaction data . The timestamp proves that the transaction data existed when the block was created. Since each block contains information about the block previous to it, they effectively form a chain ⛓, with each additional block linking to the ones before it. Consequently, blockchain transactions are irreversible in that, once they are recorded, the data in any given block cannot be altered retroactively without altering all subsequent blocks.

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