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Questions # 21:

Which of the following problems did Blockchain solve for cryptocurrencies?

Options:
A.

Anonymity

B.

Double Spending

C.

Destination of currencies

D.

None of the above

Questions # 22:

Once a record has been added to a Blockchain it can be altered.

Options:
A.

True

B.

False

Questions # 23:

Why is Hyperledger a good business solution over other Blockchains?

Options:
A.

Always permissioned and private

B.

It can employ smart contracts

C.

Modular design allowing for flexibility in solution

D.

Multiple consensus methods can be chosen for use

E.

All the above

Questions # 24:

The transaction has contained in a block is the ___________.

Options:
A.

Metadata used for ID

B.

Same as the user private key

C.

Digital fingerprint of the block

D.

Unique number to show it’s a Bitcoin block

Questions # 25:

What is a hash function?

Options:
A.

A one-way function that converts input to a unique string output

B.

A function that stores data behind a key

C.

A two-way function used for condensing information

D.

The block-ID of the block

E.

All the above

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