Introduction to Blockchain

The core feature of blockchain is decentralization. Traditional databases are typically controlled by centralized servers, while blockchain maintains data through nodes distributed across the network, without a single controlling entity, thus ensuring higher resilience and reliability. Each node stores a complete copy of the data, and any changes require consensus among the majority of nodes in the network, ensuring data security and transparency.

The data structure of blockchain consists of blocks, each containing a certain number of transaction records and the hash value of the previous block, forming a chain-like structure. This blockchain-style storage ensures the immutability of data because once a block is added to the chain, it cannot be altered, and anyone can verify its authenticity.

Blockchain ensures data security and privacy through encryption technology. Each block is linked to the previous one through a hash function, forming an irreversible connection, making it difficult to deceive or attack because any attempt to tamper with a block would disrupt the continuity of the entire chain. Moreover, while data on the blockchain is often publicly accessible, individual identities and transaction information are effectively protected due to the application of encryption technology.

In addition to serving as the underlying technology for cryptocurrencies, blockchain has a wide range of applications. In finance, it can be used to build secure payment systems, smart contracts, and asset management platforms. In supply chain management, it can track the flow of goods, enhancing transparency and efficiency. In healthcare, it can establish secure health data exchange platforms, facilitating the sharing and interoperability of medical information. In summary, blockchain, as a new type of distributed database technology, is bringing revolutionary changes to various industries, providing innovative solutions for building trust, improving efficiency, and reducing costs.