What Is Blockchain and How Does It Work? A Beginner-Friendly Guide

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What Is Blockchain?

At its core, it is a type of digital ledger — a system for recording data in a way that is secure, transparent, and decentralized. Unlike traditional databases managed by a central authority, it operates on a distributed network of computers (also known as nodes). Every participant in this network holds a copy of the ledger, which means the data is not only widely accessible but also extremely difficult to alter without detection.
Once a piece of information is recorded on the blockchain, it becomes virtually immutable — meaning it cannot be changed or deleted without the consensus of the entire network. This makes it an ideal solution for securely storing sensitive or valuable data.

How Does Blockchain Work?

Information in a blockchain is organized into digital containers called “blocks.” Each block contains a set of records — such as transaction details — a timestamp, a cryptographic identifier known as a hash, and a reference to the hash of the previous block. These blocks are linked together chronologically, forming a secure and verifiable chain.

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