Test 4 - Cryptography and Cryptocurrency (2)

 Which is the primary purpose of Bitcoin blockchain?

Select one:

• to provide smart contracts' services

• to create a market for cryptocurrency exchange

• to provide cloud computing's services

• to introduce a mechanism of exchanging digital assets

Which of the following is NOT a type of blockchains?

Select one:

• Consortiums

• Private Blockchains

• Protected Blockchains

• Public Blockchains

 Transaction confirmation is independently performed by all miner nodes in the network. True/False/Not given?

Select one:

• True

• False

• Not Given

• Both T & F

Which of the following model is used for the implementation of Bitcoin?

Select one:

• a decentralized model

• a client/server model

• a centralized model

• Both centralized model and decentralized model

Choose the INcorrect statement about a consortium?

Select one:

• All statements are incorrect

• Dragonchain is an example of consortiums

• It only contains decentralized features.

• It is a combination of public and private blockchains

Which of the following activities should NOT be implemented via a public blockchain?

Select one:

• Fundraising

• Voting

• Marketing

• Citizen information managing

The consensus protocol used by the Bitcoin blockchain is ...

Select one:

• Proof of Work

• Proof of Stake

• Proof of Activities

• Proof of Elapsed Time

Advantages of blockchains?

Select one:

• Trustless

• All mentioned are correct

• Immutable

• Peer-to-Peer

Who is the author of the digital online cryptocurrency known as Ethereal?

Select one:

• Wei Dai

• Satoshi Nakamoto

• Hal Finney

• Vitalik Buterin

Miners are computers that execute ...

Select one:

• operations defined by the blockchain protocol

• operations defined by transactions

• operations defined by users

• operations defined by a super-computer