Basic Blockchain Learning Week 1

@Tricdot Education

This test paper start with the exploration of the blockchain and its relation to distributed computing. In particular, we will learn the basics on blockchain abstraction and the importance of consensus between machines in order to mitigate the risks of having an attacker spend the same asset twice - an undesirable situation called 'double-spending'. This question paper inspired from the blockchain course on coursera. Week 1/5

This test paper start with the exploration of the blockchain and its relation to distributed computing. In particular, we will learn the basics on blockchain abstraction and the importance of consensus between machines in order to mitigate the risks of having an attacker spend the same asset twice - an undesirable situation called 'double-spending'. This question paper inspired from the blockchain course on coursera. Week 1/5

Questions

1. Which of the following milestones marked the beginning of the history of blockchain?

Mark the correct option

Bitcoin protocol was written.

Blind signature was proposed as a form of electronic carbon copy for payment systems.

Cryptography was made available to the public via the Data Encryption standard.

The cypherpunk mailing list was created.

2. The cypherpunk mailing list was created:

Mark the correct option

before the release of the Bitcoin paper.

after the release of the Bitcoin paper.

None of the above

Can't say

3. In 1998, Wei Dai sent a message on the cypherpunk mailing list, describing a system called “b-money”. The system Dai described included a significant idea that is being used in blockchain systems today. What was the significant idea first proposed in the "b-money" system?

Mark the correct option

A protocol to transfer cryptocurrency in a peer-to-peer fashion without the need of any intermediary

Public keys to represent user accounts

Application of a chain of hash to guarantee immutability

None of the above

4. Ethereum, the system first proposed by Vitalik Buterin, was commonly hailed as “Blockchain version 2.0”. Although this system was based on crypto-puzzles, it was said to extend the notion of cryptocurrency. Ethereum extended the concept of cryptocurrency by allowing users to:

Mark the correct option

upload transactions.

upload smart contracts.

transfer cryptocurrency in a peer-to-peer fashion.

None of the above

5. What prevents a participant from withdrawing coins from someone else’s account in a blockchain?

Mark the correct option

Participants have to pass a clearance check before they can start issuing transactions.

A key, which is private to the owner of the account, must be used in order to sign the transaction.

None of the above

Null

6. A blockchain is an abstraction that can be viewed as a DAG. What does DAG stand for?

Mark the correct option

Directly Assisted Graph

Directed Acyclic Graph

Directed Asymmetric Graph

None

7. True or False? The pointer is a representation of a hash of the source block that the destination block contains.

Mark the correct option

True

False

None

Can't say

8. Participants or issuers in a blockchain have two keys: a private key and a public key. Which of these keys can be used by a server to identify whether a transaction was correctly signed by an issuer who would like to propagate a transaction to the network?

Mark the correct option

Private key

Public key

Secret code

Not possible

9. Which of the following is correct regarding the genesis block?

Mark the correct option

It defines the start of the blockchain

It points to other blocks in the blockchain.

It is known only to the miners who create the new block to be appended to the blockchain.

It defines the end of the blockchain.

10. What can go wrong during the blockchain execution given its distributed nature?

Mark the correct option

Two nodes may not have the same genesis block.

Two nodes may disagree on a block at a given index higher than the genesis block.

Two nodes may disagree on a block at a given index lower than the genesis block.

None of the above

11. What would be the advantages and disadvantages of having a single copy of the blockchain that all processes would need to access?

Mark the correct option

There would not be any disagreement, but the system would not tolerate failures.

The blockchain would be easier to access but there could still be disagreement.

There would not be any disagreement but the transactions one could include in the blockchain would be conflicting.

The access time would be reduced but there could still be disagreement.

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Basic Blockchain Learning Week 1

@Tricdot Education

Questions

1. Which of the following milestones marked the beginning of the history of blockchain?

2. The cypherpunk mailing list was created:

3. In 1998, Wei Dai sent a message on the cypherpunk mailing list, describing a system called “b-money”. The system Dai described included a significant idea that is being used in blockchain systems today. What was the significant idea first proposed in the "b-money" system?

4. Ethereum, the system first proposed by Vitalik Buterin, was commonly hailed as “Blockchain version 2.0”. Although this system was based on crypto-puzzles, it was said to extend the notion of cryptocurrency. Ethereum extended the concept of cryptocurrency by allowing users to:

5. What prevents a participant from withdrawing coins from someone else’s account in a blockchain?

6. A blockchain is an abstraction that can be viewed as a DAG. What does DAG stand for?

7. True or False? The pointer is a representation of a hash of the source block that the destination block contains.

8. Participants or issuers in a blockchain have two keys: a private key and a public key. Which of these keys can be used by a server to identify whether a transaction was correctly signed by an issuer who would like to propagate a transaction to the network?

9. Which of the following is correct regarding the genesis block?

10. What can go wrong during the blockchain execution given its distributed nature?

11. What would be the advantages and disadvantages of having a single copy of the blockchain that all processes would need to access?

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