Virtual Labs

Double-Spending in Conventional Databases and Blockchain Environments

What is double spending in the context of blockchain?

a: A cryptocurrency that has twice the market value. Explanation

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b: The act of spending the same cryptocurrency more than once. Explanation

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c: A blockchain with two separate chains. Explanation

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d: A technique to speed up transaction processing Explanation

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How does a blockchain system prevent double spending?

a: By increasing the block size. Explanation

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b: By allowing every user to validate their own transactions. Explanation

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c: By using decentralized consensus mechanisms. Explanation

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d: By encrypting all transactions. Explanation

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What does the term 'immutable' mean in the context of blockchain?

a: Easily altered or changed. Explanation

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b: Unable to be changed or modified once recorded. Explanation

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c: Subject to constant updates and revisions. Explanation

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d: Permanently deleted from the blockchain. Explanation

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What is the role of miners in a blockchain network?

a: To design new cryptocurrencies. Explanation

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b: To verify and add transactions to the blockchain. Explanation

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c: To store all user private keys. Explanation

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d: To delete old transactions from the blockchain. Explanation

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Why is a centralized database more vulnerable to double spending than a blockchain?

a: It relies on a single point of control that can be hacked. Explanation

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b: It uses weaker encryption methods. Explanation

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c: It allows users to edit transactions freely. Explanation

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d: It processes transactions more slowly. Explanation

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What is a 'block' in a blockchain?

a: A type of cryptocurrency wallet. Explanation

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b: A collection of verified transactions. Explanation

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c: A tool to encrypt user data. Explanation

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d: A limit on transaction speed. Explanation

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