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Freshers / Beginner level questions & answers

Ques 1. Explain the role of a wallet in blockchain.

A wallet in blockchain is a digital tool that allows users to store and manage their cryptographic keys, which are essential for accessing and managing their cryptocurrency holdings and conducting transactions.

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Ques 2. What is the purpose of a consensus algorithm in a blockchain network?

A consensus algorithm is used to achieve agreement among nodes in a blockchain network on the validity of transactions. It ensures that all participants have a consistent view of the distributed ledger.

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Ques 3. Explain the role of a node in a blockchain network.

A node is a computer or device that participates in a blockchain network. Nodes maintain a copy of the blockchain, validate transactions, and contribute to the consensus process by reaching agreement on the state of the ledger.

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Ques 4. What is the purpose of a private key in cryptocurrency?

A private key is a cryptographic key that provides access to a user's cryptocurrency holdings. It must be kept secure, as it is used to sign transactions and prove ownership of digital assets on the blockchain.

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Intermediate / 1 to 5 years experienced level questions & answers

Ques 5. What is blockchain?

Blockchain is a decentralized, distributed ledger technology that enables secure and transparent record-keeping of transactions across multiple parties.

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Ques 6. Explain the concept of a smart contract.

A smart contract is a self-executing contract with the terms of the agreement directly written into code. It automatically enforces and executes the terms when predefined conditions are met.

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Ques 7. Differentiate between public and private blockchains.

Public blockchains are open to anyone, while private blockchains restrict access to a specific group of participants. Public blockchains are decentralized, while private blockchains may be centralized or partially decentralized.

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Ques 8. Explain the concept of consensus in blockchain.

Consensus is the process by which all participants in a blockchain network agree on the validity of transactions. Different consensus algorithms, such as Proof of Work and Proof of Stake, ensure agreement among nodes.

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Ques 9. What is a Merkle Tree, and how is it used in blockchain?

A Merkle Tree is a data structure that organizes transactions in a block. It allows for efficient verification of the integrity of data in a block by creating a single hash (the Merkle root) that represents all transactions.

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Ques 10. How does a blockchain prevent double-spending?

Blockchain prevents double-spending by requiring consensus among participants to validate and add transactions to the ledger. Once a transaction is recorded in a block, it becomes part of the immutable blockchain, making it tamper-resistant.

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Ques 11. Explain the concept of tokenization in blockchain.

Tokenization involves representing real-world assets or assets on a blockchain as digital tokens. These tokens can be traded, exchanged, or used to represent ownership of physical or digital assets.

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Ques 12. Differentiate between a permissionless and permissioned blockchain.

Permissionless blockchains are open to anyone, allowing anyone to participate and validate transactions. Permissioned blockchains restrict access to a predefined set of participants, providing more control over the network.

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Ques 13. Explain the concept of immutability in the context of blockchain.

Immutability refers to the inability to alter or tamper with data once it is recorded on the blockchain. It is a key feature that ensures the security and trustworthiness of the information stored on the blockchain.

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Ques 14. What is the role of a decentralized application (DApp) in blockchain?

A decentralized application is a software application that runs on a decentralized network, typically a blockchain. DApps operate on a peer-to-peer network and are not controlled by a single entity, promoting transparency and censorship resistance.

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Ques 15. Explain the role of the mempool in blockchain transactions.

The mempool (memory pool) is a temporary storage area where valid but unconfirmed transactions are held before being added to a block. Miners select transactions from the mempool when creating new blocks.

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Ques 16. Explain the significance of cryptographic hashing in blockchain.

Cryptographic hashing is used to create fixed-size and unique hash values for data on the blockchain. It ensures data integrity and security by making it difficult to reverse engineer the original data from the hash.

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Ques 17. What is the difference between on-chain and off-chain scaling solutions?

On-chain scaling solutions involve making changes to the blockchain protocol itself to improve scalability. Off-chain scaling solutions, on the other hand, handle transactions outside the main blockchain to alleviate congestion.

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Ques 18. What is the role of a block reward in a Proof of Work blockchain?

A block reward is an incentive provided to miners for successfully adding a new block to the blockchain. It typically consists of newly created cryptocurrency coins and transaction fees from the included transactions.

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Ques 19. Explain the concept of token standards in blockchain, with a specific example.

Token standards define a set of rules and functionalities for creating and interacting with tokens on a blockchain. An example is the ERC-20 standard on the Ethereum blockchain, which specifies the requirements for fungible tokens.

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Ques 20. What is the difference between a soft fork and a hard fork in blockchain?

A soft fork is a backward-compatible upgrade to the blockchain protocol, while a hard fork is a non-compatible and more significant change. Soft forks do not require all nodes to upgrade, whereas hard forks do.

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Experienced / Expert level questions & answers

Ques 21. What is the role of miners in blockchain?

Miners are participants in a blockchain network who validate transactions and add them to the blockchain. They use computational power to solve complex mathematical problems and reach consensus on the state of the ledger.

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Ques 22. What is a 51% attack, and how can it be prevented?

A 51% attack occurs when an entity controls more than 50% of a blockchain's mining power, allowing them to manipulate transactions. Prevention measures include using consensus algorithms, such as Proof of Work or Proof of Stake.

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Ques 23. What is the purpose of the nonce in Proof of Work consensus?

The nonce is a number used in mining to find a hash value that meets specific criteria. Miners adjust the nonce value until they find a hash that satisfies the difficulty level set by the network, thus creating a new block.

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Ques 24. What is a hard fork in blockchain?

A hard fork is a significant and incompatible change to the protocol of a blockchain network, resulting in a divergence in the blockchain's transaction history. It requires all nodes to upgrade to the latest software version.

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Ques 25. What is a sidechain in blockchain?

A sidechain is a separate blockchain that is interoperable with a main blockchain. It allows for the transfer of assets between the sidechain and the main chain, enabling the development of specific features or scalability solutions.

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Ques 26. What is the concept of atomic swaps in blockchain?

Atomic swaps enable the direct exchange of one cryptocurrency for another between users without the need for an intermediary or centralized exchange. It occurs atomically, meaning the swap either happens in full or not at all.

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Ques 27. Explain the concept of sharding in blockchain.

Sharding is a scaling technique that involves breaking the blockchain into smaller parts called shards. Each shard processes its transactions, improving the overall scalability and efficiency of the blockchain network.

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Ques 28. What is the Byzantine Generals Problem in the context of blockchain?

The Byzantine Generals Problem refers to the challenge of achieving consensus in a distributed system where nodes may behave maliciously or fail to communicate reliably. Blockchain consensus algorithms address this problem to ensure network security.

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Ques 29. Explain the concept of zero-knowledge proofs in blockchain.

Zero-knowledge proofs allow one party to prove the authenticity of information to another party without revealing any details about the information itself. This enhances privacy and security in blockchain transactions.

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