“Choose a job you love, and you will never have to work a day in your life.”  Author unknown How true is that? A job that does not carry its essence !!! A wishful thought, yet powerful. Without a doubt, all readers here must be a techie, devoted to the computer and digital world. Your passion for computing has driven you to research blockchain course technology. Readers could be here for various reasons. Either your interviewer has selected you, or you plan to pursue a career in this domain. This guide will be a refuge for many knowledge seekers. Why Should you Read this Post? This guide will help calm your nerves by answering many probable interview questions. Although there may not be a right or wrong answer yet there is ALWAYS a specific answer that the interviewer seeks! Many experts from the field of the Blockchain industry have answered in detail. True, I will address the top 30 blockchain interview questions and answers but first, let us understand the concept of Blockchain in simple terms. Blockchain is a digital structure that records information. These are blocks that hold all the transactions in a disseminated form. Here nobody can cheat or hack as it ensures complete security and transparency. Above all, the information stored is not on a single computer. It distributes data across the network and protects from theft.  This system is a chain that stores data for everything. Blockchain records transactions relating to financial or even medical data. It is the underlying technology of the cryptocurrency revolution. I have explained the Blockchain system in simple terms, so now we will delve into the interview. The questions are divided into 3 sub-sections. General questions Multiple-answer Questions Advanced Questions Here the interviewer is seeking a concise yet impactful answer. Use self-explanatory power words. Do not unleash your knowledge right away. Hold on to your reins and go steady. Happy reading!!! Q1. What do you understand about the blockchain system? How do you distinguish Bitcoin Blockchain from Ethereum Blockchain? Answer A Blockchain is a decentralized database system. Its data is irreversible and thus establishes security. Bitcoins are the first crypto-currency; they run on Blockchain technology. Bitcoin uses digital currency while Ethereum Blockchain uses Smart Contracts.  Blockchain sounds complicated yet its technology is quite simple. It is a structured collection of information or a type of database. These blocks contain data that chain together. New blocks accept new data as the old ones get full. Each block attaches to the previous one in chronological order and creates a reference point. This information becomes immutable and therefore protects all records. It allows for transparency in the transactional ledger. The Crypto-Currencies used are Bitcoin and Ether respectively.  The algorithm used by Bitcoin is SHA-256 when Ethereum uses Ethash.  Although the block time taken by Bitcoin is 10 minutes, Ethereum takes about 12-14 seconds. Q2. Do you say that a Blockchain is the same as a database? Answer The data structure is the main difference between Blockchain and the database. A database assembles the information into tables, unlike a Blockchain which groups information into blocks. No, the storage structure has a different model in both systems. In a Blockchain, the data gets converted into blocks and fastens together to form a chain. When a block fills, it obtains a timestamp and a permanent place in the timeline. The typical database stores its data as tables where only the appointed individual can access it. Q3. Are you referring to the decentralization aspect of Blockchain technology? Please explain. Answer : Decentralization is one of the fundamental features of Blockchain. This system comprises thousands of computers housed at various locations enabling separate entities to operate independently. Each computer in this network is called a node. These nodes record every transaction on the Blockchain. Yes, decentralization is a primary feature of this technology. Each node connects with the entire network of computers for cross-reference. Hence all nodes facilitate correction by referencing the other nodes. The ability to trace and rectify all errors establishes a well-constructed order of all accounts. This transparency allows individuals and groups to access the transaction from across regions. Q4. Is this technology a trusted approach? Why? Answer : Yes, Blockchain is a trusted and stable approach and has no incompatibility issue with other applications. All the transactions are immutable.   Yes, there are many reasons to trust Blockchain. It assures security to all transactions. Nobody can hack or cheat you as all events are traceable. Every business can implement this structure to store data as all information recorded becomes immutable. Q5. What are the key features of Blockchain? Answer: Name the prominent properties of this approach. The central characteristics of Blockchain are: Decentralized operations Low transactional cost Safe and secure network Minting Q6. Explain the different kinds of Blockchain. Answer: A public Blockchain is a permissionless Blockchain. There is no governing body; everyone is free to read, write and audit. It is an open-source public ledger where anyone can review the Blockchain. A single authority controls a private Blockchain. Only the approved community has the discretionary power to determine who can access its transactions. Thus it is an approved blockchain. A consortium Blockchain is where an elected body of members acts as the custodians. They are the decision-makers who influence the whole network. A semi-private application is where a single authority controls the system but gives access to any candidate who qualifies. Q7. Which Blockchain application segment do you think will become the hot flavor? Answer: There is a generic difference between a public and a private application segment. The difference lies in the following : Public segments are cheaper to use when private ones are expensive.  Public segments are more generic. In contrast, private sections are more specific because a designated group holds the credentials. I believe the semi-private sector is going to take it by storm. Possibly, companies would start giving access to customers to check the status or update. Q8. What are … Continue reading Top 30 Blockchain Interview Questions and Answers