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Blockchain interview questions

Blockchain interview questions.

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  • 1.

    What is blockchain?

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  • 2.

    What is blockchain transaction?

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  • 3.

    What is proof-of-work?

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  • 4.

    Why does Blockchain need coins or tokens?

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  • 5.

    What is the blockchain data structure?

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  • 6.

    What is the purpose of a blockchain node?

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  • 7.

    What is the Genesis Block?

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  • 8.

    Explain the common structure of blockchains

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  • 9.

    What is deterministic behavior?

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  • 10.

    Explain why a blockchain needs tokens to operate

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  • 11.

    Why is the blockchain immutable?

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  • 12.

    How Are Blockchain And Distributed Ledger Different?

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  • 13.

    What is RSA algorithm?

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  • 14.

    What is Merkle Trees?

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  • 15.

    Explain why there is a fixed supply of bitcoins?

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  • 16.

    What is a smart contract?

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  • 17.

    What is mining difficulty?

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  • 18.

    How do verifiers check if a block is valid?

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  • 19.

    Explain what do nodes do?

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  • 20.

    What is a hashing function?

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  • 21.

    What are the major elements of the blockchain ecosystem?

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  • 22.

    What is block data structure in blockchain?

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  • 23.

    What are some advantages of using Merke Trees?

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  • 24.

    What is DApp or Decentralised Application?

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  • 25.

    What are the core components of blockchain architecture?

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  • 26.

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

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  • 27.

    Name some widespread platforms for developing blockchain applications

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  • 28.

    What determines the mining difficulty?

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  • 29.

    Explain what is target hash?

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  • 30.

    What is a 51% attack?

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  • 31.

    What is nonce?

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  • 32.

    What is the difference between PoW and PoS?

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  • 33.

    How is hard fork different from the soft fork in blockchain?

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  • 34.

    What Is a Proof of Stake?

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  • 35.

    What's the difference between distributed hashtable technology and the bitcoin blockchain?

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  • 36.

    What Is a Blockchain Consensus Algorithm?

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  • 37.

    What is a stealth address?

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  • 38.

    What is off-chain transaction?

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  • 39.

    Is it possible to brute force bitcoin address creation in order to steal money?

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  • 40.

    Why is Git not considered a “block chain”?

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  • 41.

    What can an attacker with 51% of hash power do?

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  • 42.

    What are miners really solving?

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. Microservices
7 Layering & Middleware interview questions for developers

Middleware in the context of distributed applications is software that provides services beyond those provided by the operating system to enable the various components of a distributed system to communicate and manage data. Middleware supports and simplifies complex distributed application...

. Layering & Middleware
55 Docker interview questions and answers for software engineers

Docker is a set of platform as a service products that use OS-level virtualization to deliver software in packages called containers. Here is a list of coding interview questions on Docker to help you get ready for your next data structures interview in 2021.

. Docker
23 Databases interview questions and answers for software engineers

A database is an organized collection of data, generally stored and accessed electronically from a computer system. Where databases are more complex they are often developed using formal design and modeling techniques. Here is a list of coding interview questions on Databases to help you g...

. Databases
21 Concurrency interview questions and answers for software engineers

In computer science, concurrency is the ability of different parts or units of a program, algorithm, or problem to be executed out-of-order or in partial order, without affecting the final outcome. Here is a list of coding interview questions on Concurrency to help you get ready for your n...

. Concurrency
13 CAP Theorem interview questions and answers for software engineers

In theoretical computer science, the CAP theorem, also named Brewer's theorem after computer scientist Eric Brewer, states that it is impossible for a distributed data store to simultaneously provide more than two out of the following three guarantees: Consistency: Every read receives the ...

. CAP Theorem
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