Assessment 1

What is a blockchain?

• Centralized database

• A type of currency

• Distributed ledger technology on peer to peer networks.

• Interlinked databases.

How many bits are there in a Bitcoin private key?

• 8

• 32

• 64

• 256

Which of the following statement is wrong about hashing?

• A hash function is where a computer can take any content and use a mathematical formula to produce an output of a specific length.

• If the same data is passed through the same hash function, it will always produce the same output.

• It is possible to reconstruct the input from a given hash value.

• Any small change in the input would produce an entirely different hash output.

SHA 256 generates a unique ____ byte signature for a text?

• 256

• 64

• 8

• 32

SHA stands for ?

• Safe Hash Algorithm

• Secure Hash Algorithm

• Safe Hard Algorithm

• Secure Hard Algorithm

The first block in a blockchain is called?

• First Block

• Primary Block

• Genesis Block

• General Block

Which field does not belong to a block header?

• Transactions

• Merkle Hash

• Previous Hash

• Timestamp

Transactions are signed by

• The sender private key

• The sender's public key

• The receiver private key

• The receiver public key

What is the name of the author of the research paper that brought Bitcoin to the world?

• Satoshi Kon

• Satoshi Nakamoto

• Bruce Lee

• Kōkichi Mikimoto

In blockchain, blocks are linked ________

• Backward to the previous block

• Forward to next block

• Linked to both previous and next blocks

• Not linked with any other blocks