Block Size
Also known as: Block Capacity, Blockchain Block Limit, Transaction Block Size
The maximum amount of data that a single block in a blockchain can contain.
Block size refers to the maximum volume of data—typically measured in megabytes—that a single block can hold within a blockchain. It determines how many transactions can be included per block and influences transaction throughput, confirmation times, and scalability. For example, Bitcoin's block size is 1MB, though protocols like SegWit and block compression techniques effectively increase usable capacity. Debates over block size limits have led to hard forks, such as Bitcoin Cash. Optimizing block size involves balancing scalability, decentralization, and security.