CBSA - Certified Blockchain Solution Architect Core Blockchain Principles Questions and Answers — Questions and Answers
Question 1: A supply chain consortium is designing a blockchain solution to track high-value goods. A key requirement is that no single participant should be able to alter transaction records once they are validated and added to the ledger, ensuring a verifiable audit trail. Which core blockchain principle directly addresses this requirement?
- Decentralization
- Immutability (Correct answer)
- Transparency
- Smart Contracts
Correct answer: Immutability
Immutability ensures that once a transaction is written to the blockchain, it cannot be changed or deleted. This is achieved through cryptographic hashing, where each block is linked to the previous one, making any alteration to a past block evident and invalidating all subsequent blocks.
Question 2: Which of the following is the primary function of a consensus mechanism in a blockchain network?
- To encrypt transaction data for privacy.
- To execute the business logic of a smart contract.
- To ensure all network participants agree on the validity and order of transactions, maintaining a single version of the ledger. (Correct answer)
- To provide a user interface for interacting with the blockchain.
Correct answer: To ensure all network participants agree on the validity and order of transactions, maintaining a single version of the ledger.
A consensus mechanism is the protocol that allows nodes in a distributed network to agree on the current state of the ledger. It is fundamental for validating new blocks and ensuring all participants have a consistent and accurate copy of the transaction history, thus preventing issues like double-spending.
Question 3: A startup is developing a decentralized application (dApp) for automated royalty payments to artists. Whenever a piece of digital art is resold, a predefined percentage of the sale price must be automatically transferred to the original creator's wallet. Which blockchain component is best suited to implement this functionality?
- Public-Key Cryptography
- Hashing Algorithm
- Peer-to-Peer Network
- Smart Contract (Correct answer)
Correct answer: Smart Contract
Smart contracts are self-executing contracts with the terms of the agreement written directly into code. They can automate complex processes, like royalty distribution, by executing predefined actions ('if/when...then...' logic) when specific conditions are met, such as the resale of an NFT.
Question 4: The core value proposition of a public blockchain like Bitcoin or Ethereum is its resistance to control by any single entity, preventing censorship and unilateral changes. This characteristic is a direct result of which blockchain principle?
- Immutability
- Decentralization (Correct answer)
- Tokenization
- Scalability
Correct answer: Decentralization
Decentralization refers to the distribution of control and decision-making across a distributed network rather than being held by a central authority. This structure eliminates single points of failure and ensures that no single participant can dominate the network, providing censorship resistance and robustness.
Question 5: A financial consortium wants to use a blockchain for inter-bank settlements. While they need a shared, consistent ledger, the details of the transactions must remain confidential and only be visible to the involved parties. How can a solution architect balance the need for transparency among participants with the requirement for privacy?
- By using a public blockchain with pseudonymous addresses.
- By implementing a Proof of Work consensus mechanism.
- By designing a permissioned blockchain with channels or private data collections. (Correct answer)
- By storing all transaction data off-chain and only posting hashes to the blockchain.
Correct answer: By designing a permissioned blockchain with channels or private data collections.
Permissioned (or private) blockchains allow for restricted access and can be designed with features like channels (in Hyperledger Fabric) or private data collections that enable participants to execute transactions confidentially. This approach ensures that only the authorized parties to a transaction can view its details, striking a balance between shared ledger technology and privacy requirements.
Question 6: What is the primary role of public-key cryptography in securing blockchain transactions?
- To ensure the ledger is immutable and cannot be changed.
- To guarantee that all nodes in the network reach consensus.
- To provide a mechanism for creating digital signatures, proving ownership of assets and authorizing transactions. (Correct answer)
- To execute automated agreements between parties without an intermediary.
Correct answer: To provide a mechanism for creating digital signatures, proving ownership of assets and authorizing transactions.
Public-key cryptography is fundamental to blockchain security. It provides users with a key pair (a public and a private key). The private key is used to create a digital signature for a transaction, which proves ownership and authorizes the transfer of assets. The corresponding public key is used by the network to verify the signature without revealing the private key.
