Blockchain Interview Questions And Answers
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Blockchain Interview Questions

The following are some of the most frequently asked Blockchain interview questions in the interview, here are the answers for them.

Q1. What is Blockchain Technology?

The blockchain is an incorruptible digital ledger of economic transactions that can be programmed to record not just financial transactions but virtually everything of value.

Q2. What do you mean by blocks in the Blockchain technology?

A block in the Blockchain is nothing but just a list of records. When these lists are joined with each other, they are known as Blockchain. For e.g. – an organization has 100 ledger books the combination of which is known as Blockchain and a single ledger would be known as a block.

Q3. How does a block is recognized in the Blockchain approach?

Every block in this online ledger mainly consists of a hash pointer that acts as a link to the block which is previous to it, transaction data, and in fact a stamp of time.

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Q4. Is there any network-specific conditions for using Blockchain technology in an organization?

No, there is no such specific condition on using it. However, the network must be a peer-to-peer network under the worried protocols. It really validates the new block simply and helps enterprises to keep up the pace in this matter without capitalizing in third-party applications.

Q5. Is it possible to modify the data once it is written in a block?

No, it is not possible to do so. In case any customization is required, the organization simply has to remove the information from all other blocks too. It is because of no other reason than this, data must be given the extreme care of while using this method.

Q6. What type of records can be kept in Blockchain? Is there any restriction on the same?

There is no restriction of keeping records in the Blockchain approach. It must be noted that the record-keeping is not just limited to these applications only.

The common types of records that can be kept on them are:

  1. Records of medical transactions
  2. Identity management
  3. Transaction processing
  4. Events related to organizations,
  5. Management activities
  6. Documentation

Q7. What is encryption? What is its role in Blockchain?

Encryption is mainly a method that helps organizations to keep their data secure. In this method, the data is encoded up to some extent before it is sent out of a network by the sender. The only receiver can know how to decode the same. In Blockchain, this method is useful because it simply adds more to the overall security and validity of blocks and help to keep them secure.

Q8. What exactly do you know about the security of a block?

A block cannot be customized by all the users on a network. Therefore it provides an excellent level of security. Additionally, every block is secured using cryptography that is another vote in this matter. Thus one needs not to worry about the security of data that is present in a block.

Q9. Why Blockchain is a trusted approach?

Blockchain can be trusted due to several reasons. The very first thing is its compatibility with other business applications because of its open-source nature. The second one is security. As it was intended for online transactions, the developers have paid special attention in keeping up the pace when it comes to its security. It really doesn’t matter what type of business one owns, Blockchain can easily be considered.

Q10. What is Secret Sharing? Does it have any benefit in Blockchain technology?

It is well-understood that security matters a lot in digital transactions. Secret sharing in Blockchain technology is an approach that divides secret or personal information into different units and sent them to the users on the network. The original information can only be combined when a member to whom a share of the secret is allocated agree to combine them together with others. There are several security-related advantages it can offer in Blockchain technology.

Q11. Why Blockchain is a trusted approach?

Blockchain can be trusted due to several reasons. The very first thing is its compatibility with other business applications because of its open-source nature. The second one is its security. As it was intended for online transactions, the developers have paid special attention in keeping up the pace when it comes to its security. It really doesn’t matter what type of business one owns, Blockchain can easily be considered.

Q12. What is Blockchain Durability and robustness?

Blockchain technology is like the internet in that it has a built-in robustness. By storing blocks of information that are identical across its network, the blockchain cannot:

  1. Be controlled by any single entity.
  2. Has no single point of failure.

Bitcoin was invented in 2008. Since that time, the Bitcoin blockchain has operated without significant disruption. (To date, any of the problems associated with Bitcoin have been due to hacking or mismanagement. In other words, these problems come from bad intention and human error, not flaws in the underlying concepts.)

The internet itself has proven to be durable for almost 30 years. It’s a track record that bodes well for blockchain technology as it continues to be developed

Q13. What is Transparent and incorruptible in blockchain?

The blockchain network lives in a state of consensus, one that automatically checks in with itself every ten minutes. A kind of self-auditing ecosystem of a digital value, the network reconciles every transaction that happens in ten-minute intervals. Each group of these transactions is referred to as a “block”. Two important properties result from this:

Transparency data is embedded within the network as a whole, by definition it is public. It cannot be corrupted altering any unit of information on the blockchain would mean using a huge amount of computing power to override the entire network.

Q14. How does Bitcoin use Blockchain?

A transaction is a transfer of value between Bitcoin wallets that gets included in the blockchain.  Bitcoin wallets keep a secret piece of data called a private key or seed, which is used to sign transactions, providing a mathematical proof that they have come from the owner of the wallet.

Q15. Is Blockchain an incorruptible ledger?

Blockchain ledger cannot be corrupted as per the developer’s claim.

Q16. What are the business benefits of blockchain?

Blockchain consensus mechanisms provide the benefits of a consolidated, consistent dataset with reduced errors, near-real-time reference data, and the flexibility for participants to change the descriptions of the assets they own.

Because no one participating member owns the source of origin for the information contained in the shared ledger, blockchain technologies lead to increased trust and integrity in the flow of transaction information among the participating members.

The immutability mechanisms of blockchain technologies lead to lowered cost of the audit and regulatory compliance with improved transparency. And because contracts being executed on business networks using blockchain technologies are smart, automated, and final, businesses benefit from increased speed of execution, reduced costs, and less risk, all of which enables businesses to build new revenue streams to interact with clients.

Q17. What are blockchain requirements?

Blockchain is a truly disruptive technology that can transform business networks. We also believe that this innovation has to happen in the open, collaborating with other technology companies and industries. To this end, IBM continues to contribute code to the Hyperledger Project.

From IBM's perspective, industrial-grade blockchain technologies have the following characteristics:

  • A shared, permissioned ledger is the append-only system of record (SOR) and single source of truth. It is visible to all participating members of the business network.
  • A consensus protocol agreed to by all participating members of the business network ensures that the ledger is updated only with network-verified transactions.
  • Cryptography ensures tamper-proof security, authentication, and integrity of transactions.
  • Smart contracts encapsulate participant terms of agreements for the business that takes place on the network; they are stored on the validating nodes in the blockchain and triggered by transactions.

In addition to these attributes, enterprise blockchain technology needs to meet key industry requirements such as performance, verified identifies, and private and confidential transactions. Hyperledger Fabric has been architected to meet these needs. It is also designed with a pluggable consensus model, allowing businesses to select an optimal algorithm for their networks.

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