Certified Blockchain Professional (CBCP) MCQ Flashcards

A company wants to share supply chain data with partners while keeping proprietary pricing confidential. Which blockchain architecture best fits this requirement?

Answer: Consortium blockchain with channel-level privacy

A consortium blockchain with channel-level privacy (like Hyperledger Fabric channels) allows selective data sharing among specific participants while keeping other data confidential.

What cryptographic technique allows one party to prove knowledge of information without revealing the information itself?

Answer: Zero-Knowledge Proof

Zero-Knowledge Proofs (ZKPs) allow a prover to convince a verifier that a statement is true without disclosing any underlying data, used in privacy-preserving blockchain applications.

In blockchain tokenomics, what does 'token velocity' measure and why does high velocity typically harm token value?

Answer: How frequently a token changes hands — high turnover reduces holding incentives

Token velocity measures how frequently tokens circulate; high velocity means users immediately sell or exchange tokens rather than hold them, reducing demand and depressing price.

Which Layer 2 scaling solution bundles many transactions off-chain and posts only a cryptographic proof to the main chain?

Answer: ZK-Rollup

ZK-Rollups execute transactions off-chain and submit a validity proof (ZK-SNARK/STARK) to the main chain, enabling high throughput while inheriting mainchain security without a challenge period.

What is the purpose of a nonce in Bitcoin transaction signing versus in block mining?

Answer: Transaction nonces order sender outputs; mining nonces find a hash below the target difficulty

In transactions, the nonce is an account counter preventing replay; in mining, the nonce is iterated until the block hash meets the required difficulty target.

Under GDPR's 'right to erasure,' what is the primary technical challenge for blockchain systems storing personal data?

Answer: Immutable blockchain records cannot be deleted without breaking chain integrity

Blockchain's immutability — a core security feature — conflicts directly with GDPR's right to erasure, since altering or deleting records would invalidate the chain's hash linkage.

Which interoperability mechanism allows assets to move between two separate blockchains by locking them on one chain and minting equivalents on another?

Answer: Cross-Chain Bridge

A cross-chain bridge locks assets on the source chain and mints wrapped equivalents on the destination chain, enabling asset transfer without a trusted third-party custodian.