If you wish to become a Blockchain expert and learn in-depth about this technology, then you must consider the Blockchain council as the right place.

1. Copyright © Blockchain Council www.blockchain-council.org 1

2. Copyright © Blockchain Council www.blockchain-council.org
Top 10 Blockchain Interview Questions & Answer
Blockchain has become a buzzword, and it is one technology that has impacted
so many industries positively. If you are planning to become a Blockchain wizard,
then there are certain fundamental questions that you need to get familiar with.
Here are 10 Blockchain questions that you must know before appearing for an
interview:
2

3. Copyright © Blockchain Council www.blockchain-council.org
1. What is Blockchain technology?
It is a distributed ledger technology that allows storage of data cryptographically
by time-stamping it.
2. Why is Blockchain a trusted approach?
Blockchain technology is considered to be the most trusted platform for several
reasons. There are certain features which make this technology an elixir :
3

4. Copyright © Blockchain Council www.blockchain-council.org
• It can be easily integrated with another business process because of its open-
source nature.
• Security is yet another factor that has popularized Blockchain technology. All the
data entered in ten ledgers is encrypted, and hence it becomes difficult to hack it.
Besides, the time-stamping of data further makes DLT a trusted platform.
4

5. Copyright © Blockchain Council www.blockchain-council.org
3. What are the two different types of record which are present in Blockchain
in database?
The two types of records present on the Blockchain database are :
1. Block records
5

6. Copyright © Blockchain Council www.blockchain-council.org
2. Transactional records
The best part about both these records is that you can easily integrate both these records
easily.
6

7. Copyright © Blockchain Council www.blockchain-council.org
4. Mention some of the key features of Blockchain technology?
Some of the notable features of Blockchain technology are :
· Distributed ledger
· Decentralization
7

8. Copyright © Blockchain Council www.blockchain-council.org
Data encryption
· Time stamping
· Immutability
· Provenance
8

9. Copyright © Blockchain Council www.blockchain-council.org
6. What are the blocks?
Any information or data which is added to the ledger is called blocks. These
blocks are linked with each other and hence form a chain of blocks or Blockchain
we know them.
9

10. Copyright © Blockchain Council www.blockchain-council.org
7. Can you remove blocks from the networks?
Yes, it is possible to remove one or more blocks from the networks. At certain
times, you would need to work only on a specific portion, which can be easily
achieved by using default options and filters.
10

11. Copyright © Blockchain Council www.blockchain-council.org
8. What is Double Spending? Can this happen in Blockchain?
Blockchain is a common apprehension surrounding online transactions. In such a
case, a digital token is spent multiple times. This usually happens because the
digital token consists of the file, which can be easily cloned. Blockchain is
expected to be a probable solution for the same. In this case, confirming the
transactions by multiple parties before the actual transaction is written on the
ledger can prevent this.
11

12. Copyright © Blockchain Council www.blockchain-council.org
9. How is Block recognized?
Any data that enters the DLT is in the form of Block; every Block consists of a hash pointer,
which is linked to the next Block in the league.
12

13. Copyright © Blockchain Council www.blockchain-council.org
10. What is the block identifier?
These are Block header hash and Block height.
If you wish to become a Blockchain expert and learn in-depth about this
technology, then you must consider the Blockchain council as the right place.
13

14. Copyright © Blockchain Council www.blockchain-council.org
Blockchain Council Certifications
You can check out our certifications, and kick start your career in the Blockchain
space today.
● Certified Blockchain Expert
● Certified Blockchain Developer
● Certified Smart Contract Developer
● Certified Solidity Developer
● Certified Ethereum Developer
14

15. THANK YOU!
Any questions?
You can mail us at
hello@blockchain-council.org
Copyright © Blockchain Council www.blockchain-council.org 15