Fintech Blockchain

Which is NOT one of the 5 pillars of open blockchains?

• Public

• Easy to censor

• Borderless

• Neutral

How many characters does the SHA256 hash produce?

• 32

• 64

• 128

• 256

How many keys does asymmetric cryptography use?

• 0

• 1

• 2

• unlimited

What does a nonce do?

• Pads the hash with a zero

• Decodes the secret key

• Sets a reusable random seed

• Adds randomness to the hash

If you change one block in a blockchain, the others update automatically.

• True

• False, it depends on the protocol

• False, each block would have to be re-mined

Which of the following are consensus algorithms?

• Proof of Authority

• Proof of Time

• Proof of Stake

• Proof of Work

Which algorithm has the highest computational cost?

• Proof of Authority

• Proof of Stake

• Proof of Work

• Proof of Time

Which algorithm has a good balance of decentralization and lower computational cost?

• Proof of Authority

• Proof of Stake

• Proof of Work

• Proof of Time

Which algorithm is best for testing and development?

• Proof of Authority

• Proof of Work

• Proof of Stake

• Proof of Time

What is the first block in a blockchain sometimes referred to as?

• The Alpha Block

• The Root Block

• The Inception Block

• The Genesis Block