A Blockchain is a growing list of records called blocks that are linked using cryptography. Each block contains the previous block's cryptographic hash, timestamp, and transaction data. When there is any change and/or corruption in the block, this can be easily detected and the data integrity can be assessed.

By design, blockchain is resistant to data tampering. It is a system that can record transactions efficiently and in a verifiable and persistent manner.

A blockchain is a decentralized, distributed, public digital ledger often made up of blocks that are used to record transactions. Due to the architecture of blockchain, a block can't be modified retroactively without modifications to all subsequent blocks. This allows authorities to independently and relatively affordably verify and audit transactions.