Blockchain

A blockchain fundamentally operates as a public, unchangeable record of information shared across a network of computers. Each “block” contains a timestamped list of transactions, and once verified by the network, it links cryptographically to the previous block, forming a chain. This structure ensures that once a transaction is recorded, it becomes nearly impossible to change or remove it without altering all subsequent blocks, which the network would detect and reject. This distributed nature means no single entity controls the entire ledger; instead, all participants maintain a copy.

The technology matters because it establishes trust and transparency without requiring a central authority or intermediary. It provides a secure and verifiable way to record and transfer data or assets, enhancing data integrity and reducing fraud. This setup can streamline processes, cut costs, and increase efficiency in various applications where trust is a primary concern. For instance, the cryptocurrency Bitcoin uses blockchain to record every transaction. When someone sends Bitcoin, the transaction is added to a block, verified by the network, and then permanently recorded on the blockchain, creating a transparent and immutable history of ownership transfers without the need for a bank.