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Blockchain Interview Questions and Answers

By Admin
Last update: 08 Sep 2020, 14 Questions

Blockchain technology sometimes also referred to as Distributed Ledger Technology (DLT), makes the transactional history of any digital asset unalterable and transparent through the use of decentralization and cryptographic hashing. It is widely popular because it helps in reducing risks, brings out fraud, and brings in scalability for a myriad of users.

Our list of blockchain interview questions shall help you to gain more insights into this subject and also help you secure a job position in this promising field. You can download these interview questions and answers in a PDF format to read along later.

Most Frequently Asked Blockchain Interview Questions

1. Why is Blockchain a trusted approach?

The blockchain is a decentralized and distributed database for unaltered records. Here are some of the reasons why it is trusted:

  • Compatible with almost all business applications as it is open-source.
  • Extra focus on security as all transactions happen online.
  • Enhanced, traceability, transparency, efficiency, and speed.

Note: Due to its unprecedented standards of security, Microsoft has been working on a Blockchain project to create Digital IDs for more than 1 billion people who currently have no ID to prove their identity. Our Blockchain interview questions shall answer your queries regarding the security methods used by Blockchain.

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2. What are the different types of Blockchains?

Currently, there are four types of Blockchain:

  • Public Blockchain
  • Private Blockchain
  • Consortium Blockchain
  • Hybrid Blockchain
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3. What is the difference between the Bitcoin blockchain and Ethereum blockchain?
Bitcoin Ethereum
This does not allow scripting. This allows scripting via smart contracts.
It is a decentralized cryptocurrency which tracks the ownership of currency in a peer to peer network. It is a decentralized platform used as a cryptocurrency while focusing on running the program code of any decentralized application.
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4. What is a Merkle tree in Blockchain?

A Merkle Tree is also known as Binary Hash Tree. It is a data structure used in Blockchain and cryptocurrencies to encode the Blockchain data more efficiently and securely.

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5. What are the benefits of Blockchain?

Here are the benefits of using Blockchain Technology:

  • It allows users verification without any dependency on third-party software.
  • The data structure used in Blockchain is append-only. Hence it cannot be edited or altered with.
  • It uses cryptography technology to secure data ledgers.

Note: Although Blockchain is being used by only 0.5% of the world’s population, tech giants like IBM and Microsoft are investing a lot of resources and manpower in Blockchain-related projects. Read our comprehensive collection of blockchain interview questions to know more.

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6. What makes Blockchain more secure?

Blockchain is secure as all the transactions are secured using cryptography. Each transaction is signed using a private key which can be further divided into public keys. If the transaction data has any changes, the signature becomes invalid and the whole block shall be ignored.

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7. What is a trapdoor function, and why is it needed in blockchain development?

A trapdoor function is one that is easy to compute within one direction. It is very tough to compute the other way unless you have special information/privileges. It is used in Blockchain development for public-key encryption, representing ideas of addresses and private keys.

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8. What is the role of encryption in Blockchain?

Blockchain uses encryption(cryptography) to protect the identities of any network, ensure secure transactions, and protect valuable information. A combination of public and private keys enables the encryption of the information.

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9. What is scriptPubKey?

scriptPubKey is technically a locking script which is placed on the output of any Bitcoin-based transactions requiring special conditions to be met for the user to spend his/her Bitcoins.

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10. What is Double Spending? Is it possible to double spend in a Blockchain system?

Double Spending is a phenomenon that occurs when a Blockchain network is disrupted and cryptocurrencies are stolen. This is a possibility in a Blockchain system.

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11. What is a blind signature in Blockchain?

Blind Signature is based on a public key digital signature scheme like RSA. In Blockchain, it is used to get the message signed by the signer without actually revealing any information of the message. This is achieved by disguising the message before signing it.

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12. What keeps your transaction data safe in blockchain?

In a Blockchain, transaction data is stored in the form of records in ‘Digital Blocks”. Each block is connected to all the blocks before and after it. These are secured using cryptography. Now, because Blockchain is decentralized and comprises a peer-to-peer network, data cannot be altered from a single point/computer.

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13. What is Secret Sharing?

Secret Sharing is a method used by the Blockchain to protect data. In this, instead of sharing information directly to the receiver, the user sends parts of the information to multiple systems with the receiver as the destination.

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14. Why a blockchain needs tokens to operate?

Tokens are an integral part of the blockchain network and are used in multiple ways to represent ownership, investment, and incentivize growth. Besides this, tokens also have a variety of direct and indirect functional capabilities.

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