Question

 

 Explain Block Chain Technology and Security in detail.

14 Feb 2026
Answer :
Word Count : 1132
Blockchain technology has emerged as a revolutionary innovation in the field of information and cyber security, providing a decentralized, secure, and transparent method of recording and verifying transactions. At its core, blockchain is a distributed ledger technology (DLT) that enables data to be stored across a network of computers, ensuring that no single entity has control over the entire database. Each record, known as a block, contains transaction data, a timestamp, and a cryptographic hash of the previous block, forming a chain of blocks that is immutable and tamper-evident. This structure ensures that any attempt to alter a single block would require altering all subsequent blocks across the network, which is computationally infeasible, thus providing a high level of data integrity and trust. One of the key features of blockchain is decentralization, which eliminates the need for a central authority or intermediary to validate transactions. Instead, transactions are verified through consensus mechanisms such as Proof of Work (PoW), Proof of Stake (PoS), or more advanced protocols like Practical Byzantine Fault Tolerance (PBFT). In PoW, network participants known as miners solve complex mathematical puzzles to validate transactions and add _____ ____ __________ _________ _________.
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