Blockchain is a decentralized, digital ledger that records transactions across a network of computers. Unlike traditional systems controlled by one central authority, blockchain is maintained by a network of nodes, each holding a copy of the blockchain.

This makes it more secure and transparent, as no single entity controls it. Transactions are verified by consensus among nodes, ensuring trust and reducing the risk of fraud.

Each block in the blockchain contains transaction data. Once a block is added, it is secured with cryptographic methods, making the data tamper-resistant.

The chain of blocks is linked by unique cryptographic hashes, ensuring that altering any block would break the chain, which would be easily detectable. The transparency of blockchain allows anyone with access to view the transaction history.

Blockchain Components and Their Functions Blocks A block in a blockchain is a container for transaction data and has three main parts:

 Transaction Data: Details like sender, receiver, amount, and time.

 Block Hash: A unique identifier for the block, ensuring its integrity.

 Previous Block Hash: Links the block to the previous one, forming an unbreakable chain.

📌 A block has two main sections:

 Block Header: Contains metadata like the block’s version, timestamp, and the previous block’s hash.

 Block Body: Contains the transaction data, the core information added to the blockchain. Chain of Blocks.

Blocks are linked through hashes to form a continuous chain. Each new block contains the hash of the previous block, securing the chain. Any change in a block would alter its hash and breakthe chain, making tampering detectable. Blocks are added through a consensus process, ensuring all participants agree on the validity of the new block.

Block size affects blockchain performance. Larger blocks store more transactions but can slow the network, while smaller blocks are faster but may lead to higher fees or slower processing during peak times.

Nodes;

Nodes are participants that help maintain and secure the blockchain. Each node stores a full or partial copy of the blockchain and validates transactions. There are different types of nodes:

 Full Nodes: Store the entire blockchain and validate transactions.

 Light Nodes: Store only a portion of the blockchain and rely on full nodes for validation.

 Miner Nodes: Participate in creating new blocks by solving complex problems.

Blockchain operates on a peer-to-peer network, allowing nodes to communicate directly with each other. This decentralization makes the network resilient, as the failure of one node does not affect the system’s overall functionality.

To be Continued.....