Free CBBF Practice Test Questions 2026

In which consensus algorithm is a nonce used?

A. Proof of Activity

B. Proof of Work

C. Proof of Stake

D. Proof of Burn

E. All of the above

What does a Merkle tree provide?

A. Efficient block lookups and protection against forgery

B. Anonymity and transparency

C. A Turing complete distributed network

D. A way to deploy smart contracts onto the Blockchain

E. All of the above

What is the focus or primary goal of a private Blockchain? Select all that apply.

A. To provide anonymity in business

B. To save money by eliminating intermediaries

C. To create a distributed database that allows for CRUD

D. To provide transparency and trust for business while remaining secure

The transaction hash contained in a block is the______________.

A. unique number to show it’s a Bitcoin block

B. same as the user private key

C. digital fingerprint of the block

D. metadata used for ID

Which of the following statements sums up the Proof of Work consensus process?

A. Miners complete to find a nonce results in a hash that starts with a predetermined number of leading zeros.

B. Miners put up a stake. A miner is then selected based on stake value to add a new block to the chain. If a miner adds an invalid block to the chain, that miner loses their stake.

C. All nodes agree on the data of the transaction.

D. Miners send assets to an inactive address. This process selects the next owner of a block.

A Blockchain does NOT provide which attribute?

A. Security through distribution

B. Anonymity through cryptography

C. Fault Tolerance through distribution

D. Immutability through hashing

Which of the following are practical use cases for Blockchain?

A. Voting

B. A video sharing website

C. Medical records

D. Identity management

E. All of the above

Blockchain 3.0 combined with the internet 3.0 will dramatically increase Blockchain use?

A. True

B. False

In 2009, Bitcoin was created by_________.

A. Vitalik Buterin

B. Satoshi Nakamoto

C. Hyperledger Foundation

D. A Banking Consortium

Cryptocurrencies are a security regulated by the Securities and Exchange Commission.

A. True

B. False

Which of the following problems did Blockchain solve for cryptocurrencies?

A. Anonymity

B. Double Spending

C. Destination of currencies

D. None of the above

One of Blockchain's primary uses of cryptography is ___________.

A. Keeping the IP addresses a secret

B. Allowing users to communicate with each other anonymously

C. Keeping the network configuration a secret.

D. Providing a public and private encryption key