Blockchain level two knowledge test

Blockchain basic knowledge of the second level examination, examination time 30 minutes, total score 100 points, please seriously answer, the test person and the supervisor: Gao Zhihao, please reprint note, thank you for your support.

One, single choice (5 points per topic, total 30 points)

1, Satoshi is where the person.

A. Chinese B. American c. Japanese D. uncertainty

2. Which of the following consensus mechanisms is the least efficient.

A.pow B.pos C.dpos d.pbft

3, if also received two legal ledger how to deal with.

A. Take the current longest branch as the main ledger, but keep the other branches

B. Keep the current longest branch as the main ledger only

C. To retain the oldest branch of the trading time as the main ledger, but retain other branches

D. Retain only the largest trading branch of the mining process as the main ledger

4. The Byzantine general problem solved which problem.

A. Distributed communications B. Content encryption c. Consensus mechanism D. Voting mechanism

5, in protecting your blockchain, such as bitcoin account privacy, which is the correct statement.

A. Bitcoin itself is an anonymous address and can already protect privacy

B. To truly protect privacy, use only one Bitcoin address at a time

C. Non-disclosure of bitcoin addresses, except for Point-to-point transactions

D. Using Cold wallet Storage

6. About the digital money miners and their mining procedures which are correct.

A. are provided by the native digital currency developer package

B. Generally custom-developed

C. General harmonization of mining procedures provided by the mine pool

D. If the same utxo constructs two transactions, respectively, to A and B, the miners are not allowed to arbitrarily choose between the two transactions

Second, non-problem (3 points for each question, total 30 points)

1, the data on the blockchain is encrypted by default

2, the record on the blockchain is real

3. Block chain record all events are non-tamper

4. No denial of service attack (DDOS) problem in blockchain

5, the encryption of digital currency is the use of blockchain technology

6, each node of the bitcoin synchronization of the ledger are all the ledger

7. When the last Bitcoin is dug out, Bitcoin does not need to continue mining

8, the blockchain signature encryption technology generally uses the symmetric encryption technology

9, all the blockchain technology of each node is not different, are equal

10. Blockchain equivalent to distributed ledger

Three, multi-choice (5 points per topic, total 40 points)

1. Which of the following is correct for the blockchain description?

A. Go to center B. Weak center c. Single center D. Multi-centre

2, Bitcoin is.

A. A bunch of encryption code B. Global synchronization ledger c. Encrypting digital currency D. Chunks

3, below which belongs to the teacher out of the same.

A.etc and ETH B.ripple and stellar c. Bitcoin and bitcoin shares D. Bitcoin and Wright Coins

4, below which belongs to the current blockchain technology application scenario.

A. Internet of things B. projections c. stock transactions D. Alipay E. Supply chain management

5, in general, the alliance chain relative to the advantages of the public chain where.

A. No 51% attacks B. Low energy consumption C. High scalability D. Higher performance E. Trust issues better addressed

6, for the owner of the blockchain-based digital money assets, the most important thing is to protect their own.

A. Public key B. Private key C. account Password D. Digital signature E. Wallet

7. Bitcoin is recorded in the blockchain.

A. Account information B. Account balance C. transaction D. Output not spent

8. Which of the following is the difference between Bitcoin and Ethereum 1.0 blockchain technology.

A. Consensus mechanism B. Mining algorithm c. Intelligent contract D. Development center E. Inflation deflation

Author: Gao Zhihao (Weibo.com/elwingao)