Block

What is Block?

A block is a fundamental component of blockchain architecture, serving as a digital container that holds a batch of verified transactions. These transactions are grouped together and recorded within a block, which is then added to the blockchain in chronological order. Each block contains critical metadata, including a timestamp, a cryptographic hash of the previous block, and a unique hash for its own contents. This linking structure forms a continuous and tamper-resistant chain that ensures transparency and security across the entire blockchain network.

The process of adding a block to the blockchain depends on the network’s consensus mechanism. In Proof of Work (PoW) systems like Bitcoin, new blocks are created through mining, which involves solving complex mathematical puzzles that require significant computational effort. In Proof of Stake (PoS) systems, blocks are added by validators who are selected based on the amount of cryptocurrency they have staked as collateral. Once a block is verified and accepted by the network, it is propagated to all nodes and becomes a permanent part of the distributed ledger.

This sequential, cryptographically linked structure makes it nearly impossible to alter previous blocks without invalidating the entire chain. As a result, blocks form the backbone of decentralized technologies by securing data, enabling trustless systems, and eliminating the need for centralized intermediaries.