Test 3 - Cryptography and Cryptocurrency (1)

A transaction generates new UTXOs for transferring the amount specified in the input UTXOs. True/False/Not given?

Select one:

• False

• True

• Not Given

• Both T & F

Where are the transactions stored in a blockchain?

Select one:

• On a SQLite database service

• On a SQL database service

• On a centralized immutable ledger

• On a distributed immutable ledger

Choose the correct description about blockchain?

Select one:

• A blockchain consists of growing list of transactions.

• There is usually one transaction stored inside a block of blockchains.

• All statements are correct.

• Blocks in blockchains could be at a normal security level for preventing attacks from unauthorized parties.

• The distributed ledger technology (DLT) could be used for implementing a blockchain

Which of the following is NOT a disadvantage of blockchains?

Select one:

• Growing Pains

• Environmental Impact

• False Narratives

• Immutable

 Choose the correct statement about a public blockchain?

Select one:

• It only uses proof-of-work as consensus protocol for transaction validation

• Many current cryptocurrencies are public blockchains

• It only uses proof-of-stake as consensus protocol for transaction validation

• It is accessible to anyone who wants to request or validate a transaction

TXO stands for ...

Select one:

• Unspent Transaction Output

• Unique Transaction Offer

• Unspent Trade Offer

• Unspent Transaction Xeroxed Output

One of the primary purposes of Ethereum blockchain?

Select one:

• to provide smart contracts' services

• to provide cloud computing's services

• to create a market for cryptocurrency exchange

• to introduce a mechanism of exchanging digital assets

Which of the following activities should be implemented via a private blockchain?

Select one:

• Supply chain management

• All activities should be

• Internal Voting

• Asset ownership

The genesis block is ...

Select one:

• The block #0 of a blockchain

• Any block created by the blockchain author

• The final block of a blockchain

• The first transaction in each block

What are UTXOs in a Bitcoin Blockchain?

Select one:

• They define the inputs and outputs of transactions

• They are actual currency that is sent to the receiver of a transaction

• They are transaction output that has been expended

• They are total rewards for miners in the network