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Blockchain CBSA Exam Questions
BTA Certified Blockchain Solution Architect (Page 3 )

Updated On: 21-Feb-2026
Page 3 of 47
PDF with 229 Questions

A ____________cipher basically means it is using a fixed key which replaces the message with a pseudorandom string of characters. It is basically the encryption of each letter one at a time.

What is the cipher type?

  1. Stream
  2. Block
  3. Parallel
  4. RSA

Answer(s): A

Explanation:

Stream cipher basically means using a fixed key which replaces the message with a pseudorandom string of characters. It is basically the encryption of each letter one at a time.


Reference:

https://blockgeeks.com/guides/cryptocurrencies-cryptography/



You currently using the Metamask Chrome plugin and you see a selection for Etherescan in the plugin. What is Etherscan used for?

  1. A search engine that allows users to easily lookup, confirm and validate transaction that have taken place on the Ethereum Blockchain
  2. A search engine that allows users to easily lookup, confirm and validate transaction that have taken place on the Bitcoin Blockchain
  3. A search engine that allows users to easily lookup, confirm and validate transaction that have taken place on the Ethereum and Tokens Blockchain
  4. A search engine that allows users to easily lookup, confirm and validate transaction that have taken place on any Blockchain

Answer(s): A

Explanation:

A search engine that allows users to easily lookup, confirm and validate transactions that have taken place on the Ethereum Blockchain


Reference:

https://etherscancom.freshdesk.com/support/solutions/articles/35000022140-what-is-etherscan-



What are two challenges with using a Proof of Work algorithm? (Select two.)

  1. Mining pools not allowed
  2. Difficulty rate goes done every year.
  3. Expensive
  4. Power Intensive

Answer(s): C,D


Reference:

http://www.hl.co.uk/news/2018/2/16/a-brief-history-of-blockchain-technology-everyone-should-read



Your customer is an enterprise that is focused on financial sectors.
What type of blockchain would this customer likely want specified for their enterprise?

  1. Permissionless
  2. Decentralized
  3. Hybrid
  4. Permissioned

Answer(s): D

Explanation:

Sometimes referred to as “private” blockchains, you are required to have some sort of permission to access any or parts of that blockchain. There are a multitude of variants and hybrid permissioned/permissionless blockchains that exist.


Reference:

https://medium.com/@dustindreifuerst/permissioned-vs-permissionless-blockchains-acb8661ee095



Which is the following is the metaphor that describes a logical dilemma that plagues many computer networks?

  1. Neo Generals’ problem
  2. Byzantine Generals’ problem
  3. Byzantine Admirals’ problem
  4. Renaissance Generals’ problem

Answer(s): B

Explanation:

BFT is so-named because it represents a solution to the "Byzantine generals' problem," a logical dilemma that researchers Leslie Lamport, Robert Shostak and Marshall Pease described in an academic paper published in 1982


Reference:

https://www.nasdaq.com/article/byzantine-fault-tolerance-the-key-for-blockchains-cm810058






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