10 Essential Blockchain Interview Questions.
Looking for the Blockchain Interview Questions ? Here you can Find 10 Effective Blockchain Interview Questions.
A blockchain, originally block chain, is a growing list of records, called blocks, that are linked using cryptography. Each block contains a cryptographic hash of the previous block, a timestamp, and transaction data (generally represented as a Merkle tree).
By design, a blockchain is resistant to modification of the data. It is “an open, distributed ledger that can record transactions between two parties efficiently and in a verifiable and permanent way”. For use as a distributed ledger, a blockchain is typically managed by a peer-to-peer network collectively adhering to a protocol for inter-node communication and validating new blocks. Once recorded, the data in any given block cannot be altered retroactively without alteration of all subsequent blocks, which requires consensus of the network majority. Source: Wikipedia
Blockchain Interview Questions
Q1. Explain the exact meaning of blockchain? Give more detail on the basic difference between two kinds of blockchain ethereum blockchain and bitcoin blockchain.
Blockchain mainly designed for maintaining decentralize immutable data in the distributed platform without any loss of data of the entire chain. It mainly came to the market by discovering one of the great invention bitcoin, introducing cryptocurrency first in the market. No doubt, blockchain always followed the trusted approach and presents a lot of companies are showing their interest only for the same.
This kind of trusted approach will automatically increase in long run as till now it’s an open source. Bitcoin is mainly dealing the currency or in industry word digital currency, whereas ethereum is mainly dealing with contracts or in industry word smart contracts.
Satoshi Nakamoto is the person who invented bitcoin, and Vitalik Buterin had invented Ethereum. Thinking approach for bitcoin is mainly targeting normal block concept or genesis block. Whereas Ethereum is targeting pre-sales.Bitcoin-using normal SHA-256 algorithm, whereas ethereum used that. Bitcoin is blocking almost 10 minutes time, whereas ethereum is taken only 12-14 seconds.
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Q2. Give more details with proper explanation of which principle mainly follows by blockchain in any kind of situation, which is the very basic understanding of blockchain?
It mainly concentrating on enabling all the required information of anything will be distributed among all the users who are willing to view, but never make another copy for completing this task smartly.
Q3. There has a lot of similar kind of approach available in the current industry, then why people are telling blockchain are more trusted than others?
|Mainly three kind of blockchain available in the market, one is public where information is viewable by everyone, another one is private where information is viewable to the specific person, and the third one is a consortium, where the group of members can able to view require information.
Q4. What kind of records blockchain can hold in their database, normally types of records present in the blockchain database directly, provide some example?
This is the basic Blockchain Interview Question asked in an interview. Two kind of records normally holds by blockchain without loss of information. One is block records and another one is transactional records. Both those records are very much popular and maintaining a well or good relationship between each other. Both are very much well accessible without any big implementation. And also the best thing is if people need to integrate with between each other means block data and transactional data then that part also be very much easy without written any big algorithm.
Q5. Blockchain database is very much different than the other popular available database in the current market, can give some more explanation about different with all the available traditional database and blockchain database?
Blockchain database normally storing two kinds of data in their database, one is block data and another one is traditional data. Please find a difference between them: Blockchain only following the insert operation, it never accepts update or deletes operation. Whereas traditional data always accepting all kind of operation like create, insert, update and delete. Full replication is required for the blockchain in every peer.
There does not have any kind of slave concept in bitcoin. Whereas traditional data following master-slave or multi-master concept, which is entirely different than bitcoin. Normally maximum peers have agreed with whatever result came out from the transactions.
Whereas traditional database followed 2 phase transactions or distributed transaction. Bitcoin does not have any kind of relational dependency, so anyone can able to access bitcoin transactions inside the same network. Whereas traditional database always followed integrity constraint.
Let us move to the advanced level of Blockchain Interview Questions.
Q6. Explain all the properties available for blockchain in details.
Blockchain mainly followed some key features like system decentralization, proper distribution of ledger, maintaining ecosystem more secure or safer for all, producing data for the first time or maintaining minting.
Q7. Provide more explanation about the understanding of encryption. And given little details of encryption role in blockchain technology.
For the data security which is always a big matter for any organization, encryption of data is mandatory. Encryption is one of the methodologies which actually helps any organization to keep their important data in a secure manner.
Q8. Explain the exact meaning of blocks in current blockchain technology.
The blockchain is usually stored a lot of records in a block. And that block also links with another one and created a required chain called blockchain.
Q9. If anyone willing to identify one specific block in the entire blockchain, then what will be the specific approach needs to be taken by them for recognizing that specific block in the entire blockchain?
This is the most asked Blockchain Interview Questions in an interview. Every block should have one hash pointer, which always considers as a link to a block.
Q10. Now considering a blockchain data is very secure as per market preview, if someone willing to modify some data of a specific block in the entire blockchain, then is it possible to modify, if yes then explain how can able to do the same?
No, the modification is not possible at all. If any organization need to modify some data in a specific block, they have to erase related data from another block as well.