Blockchain Interview Questions
Master the most commonly asked interview questions with comprehensive, expert-crafted answers designed to help you succeed.
What is Blockchain and how does it work?
Blockchain is a decentralized, distributed ledger technology that records transactions across a peer-to-peer network of computers.
Each block contains a list of transactions and a cryptographic hash of the previous block, creating a chain of blocks that is resistant to modification.
Once recorded, data becomes nearly immutable without consensus from the network.
Blockchain powers cryptocurrencies like Bitcoin and Ethereum, and is used in supply chain, voting, and smart contracts.
Decentralization, transparency, and tamper-resistance are key features.
What is a smart contract?
Smart Contracts are self-executing contracts with the terms of agreement written into code.
They run on blockchain platforms like Ethereum and execute automatically when conditions are met.
Use cases include DeFi, NFTs, supply chain, and automated settlements.
Smart contracts eliminate intermediaries, reduce costs, and increase trust in decentralized applications.
Security, gas fees, and immutability are key considerations in smart contract development.
What is mining in Blockchain?
Mining is the process of validating transactions and adding them to the blockchain in proof-of-work systems like Bitcoin.
Miners solve complex mathematical puzzles to earn rewards in the native cryptocurrency.
Mining secures the network, prevents double-spending, and distributes consensus without a central authority.
Other consensus mechanisms include Proof of Stake (PoS), Delegated PoS, and Practical Byzantine Fault Tolerance (PBFT).
Mining consumes energy but ensures decentralization and security in permissionless blockchains.
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