Bitcoin: A Peer-to-Peer Electronic Cash System

What is the main benefit of a purely peer-to-peer version of electronic cash?

• Avoiding the need for financial institutions

• Providing digital signatures

• Preventing double-spending

• Creating a record of transactions

Answer explanation

The main benefit of a purely peer-to-peer version of electronic cash, as highlighted in the question, is 'Avoiding the need for financial institutions'. This model eliminates the reliance on third-party intermediaries like banks or credit card companies for financial transactions, hence making it a more direct and efficient system.

What is the proposed solution to the double-spending problem?

• Using digital signatures

• Implementing a trusted third party

• Using a peer-to-peer network

• Creating a chain of hash-based proof-of-work

What is the problem with introducing a trusted central authority in the electronic payment system?

• It increases transaction costs

• It limits the minimum practical transaction size

• It requires the return of the coin to the mint

• It determines on the fate of the entire money system

What is the purpose of a timestamp server in the Bitcoin network?

• To decide the order of transactions

• To verify the authenticity of transactions

• To publish the hash of a block

• To implement a proof-of-work system

What is the role of proof-of-work in the Bitcoin network?

• To prevent double-spending of transactions

• To determine representation in majority decision making

• To validate the previous transactions

• To compensate for increasing hardware speed

How does the Bitcoin network ensure the security of the blockchain?

• By relying on a trusted party to validate transactions

• By using a decentralized network of nodes

• By encrypting all transactions

• By requiring a majority vote for each transaction

What is the purpose of the previous hash in a blockchain?

• To store the transaction fees

• To verify the authenticity of the block

• To determine the length of the chain

• To distribute coins into circulation

How does the blockchain handle conflicting versions of the next block?

• Nodes always consider the longest chain to be correct

• Nodes vote to decide the correct version

• Nodes discard both versions and start a new block

• Nodes randomly choose one version to follow

What is one advantage of using blockchain technology for verifying transactions?

• It allows for faster verification of transactions

• It provides complete privacy for all transactions

• It prevents any possibility of fraudulent transactions

• It allows for independent verification and security

How does the blockchain ensure privacy in transactions?

• By keeping public keys anonymous

• By limiting access to transaction information

• By encrypting all transaction data

• By requiring a trusted third party for verification