Blockchain integrity is achieved through various mechanisms such as cryptographic hashing, consensus algorithms, and decentralized network architecture, ensuring that any attempt to change data will result in discrepancies that are easily detectable. This integrity is crucial for maintaining trust among participants in a blockchain network, making it a foundational characteristic of blockchain technology. Each transaction is grouped into a block, which is linked to the previous block via a cryptographic hash, forming a chain. If a single block is altered, the hash changes, thereby alerting the network to the inconsistency. The decentralized nature of blockchain means that no single party has control over the entire chain, greatly enhancing security.