;stroke-width:0px;}%3c/style%3e%3clinearGradient%20id='b'%20x1='4.3'%20y1='22.8'%20x2='19.8'%20y2='2.3'%20gradientTransform='translate(0%2025.3)%20scale(1%20-1)'%20gradientUnits='userSpaceOnUse'%3e%3cstop%20offset='0'%20stop-color='%23f9e833'/%3e%3cstop%20offset='.4'%20stop-color='%23facb3a'/%3e%3cstop%20offset='1'%20stop-color='%23fbb140'/%3e%3c/linearGradient%3e%3c/defs%3e%3cpath%20class='c'%20d='m11.5,19.8c.3-.2.8-.2,1.1,0l5.5,2.9c1.2.6,1.9,0,1.7-1.2l-1-6.1c0-.3,0-.8.3-1l4.4-4.3c.9-.9.6-1.8-.7-2l-6.1-.9c-.3,0-.7-.3-.9-.6L13.1.9c-.6-1.2-1.5-1.2-2.1,0l-2.7,5.6c-.1.3-.5.6-.9.6l-6.1.9c-1.3.2-1.6,1.1-.7,2l4.4,4.3c.2.2.4.7.3,1l-1,6.1c-.2,1.3.5,1.9,1.7,1.2l5.5-2.9h0Z'/%3e%3c/svg%3e){kind=small}
1.
Can you explain what a blockchain is and how it works?
Answer:
Blockchain Fundamentals
- 2.
What is the difference between a public blockchain and a private blockchain?
Answer: - 3.
What are the key features of a blockchain that make it secure?
Answer: - 4.
How does a blockchain ensure data integrity and prevent tampering?
Answer: - 5.
Can you explain the concept of decentralization in blockchain?
Answer: - 6.
What is a consensus mechanism, and why is it important in blockchain technology?
Answer: - 7.
Describe the most common types of consensus algorithms and how they differ.
Answer: - 8.
How does a blockchain achieve consensus in a distributed environment?
Answer: - 9.
What is a node in the blockchain context, and what role does it play?
Answer: - 10.
Can you explain what a blockchain fork is and why it might occur?
Answer:
Cryptography in Blockchain
- 11.
How does cryptography secure transactions and blocks in a blockchain?
Answer: - 12.
What is a hash function, and why is it crucial to blockchain technology?
Answer: - 13.
Can you explain asymmetric encryption and how it’s used in blockchains?
Answer: - 14.
What is a digital signature, and how does it provide authenticity in transactions?
Answer: - 15.
How do public and private keys work within blockchain?
Answer:
Smart Contracts
- 16.
Define smart contracts and how they operate within a blockchain.
Answer: - 17.
What platforms can you use to deploy smart contracts, and what are their differences?
Answer: - 18.
How can smart contracts access off-chain data?
Answer: - 19.
Explain how smart contracts handle exceptions or errors.
Answer: - 20.
Can you describe a potential security vulnerability in a smart contract?
Answer:
Ethereum Basics
- 21.
What is Ethereum, and how does it differ from Bitcoin?
Answer: - 22.
Can you describe what Gas is in the context of Ethereum?
Answer: - 23.
What is the Ethereum Virtual Machine (EVM), and what is its role?
Answer: - 24.
How is the state of the Ethereum blockchain maintained?
Answer: - 25.
Explain what ERC-20 and ERC-721 tokens are.
Answer:
Blockchain Data Structures & Design
- 26.
Explain the structure of a blockchain block and its contents.
Answer: - 27.
What is a Merkle tree, and why is it important in blockchain?
Answer: - 28.
How can blockchain systems ensure scalability and performance?
Answer: - 29.
Describe the process of adding a new block to a blockchain.
Answer: - 30.
What considerations are involved in designing a blockchain architecture?
Answer:
Transactions and UTXOs
- 31.
Explain the concept of transactions within a blockchain.
Answer: - 32.
What is a UTXO, and how is it different from an account/balance model?
Answer: - 33.
How are fees determined in a blockchain transaction?
Answer: - 34.
Describe the lifecycle of a blockchain transaction from creation to confirmation.
Answer: - 35.
What is a mempool in the context of blockchain?
Answer:
Blockchain Security
- 36.
Discuss the concept of the 51% attack and its implications.
Answer: - 37.
How can a blockchain prevent double-spending?
Answer: - 38.
What are some common security threats to blockchain systems?
Answer: - 39.
Can you explain how blockchain immutability is maintained?
Answer: - 40.
How does a blockchain network defend against Sybil attacks?
Answer:
Interoperability and Scalability
- 41.
What strategies exist to improve blockchain scalability?
Answer: - 42.
How can different blockchain networks achieve interoperability?
Answer: - 43.
Explain the concept of sidechains and how they work.
Answer: - 44.
What role do layer 2 protocols play in blockchain?
Answer: - 45.
Discuss the trade-offs between scalability, security, and decentralization.
Answer:
Blockchain Development and Testing
- 46.
What tools and environments are available for blockchain development?
Answer: - 47.
How would you approach testing smart contracts?
Answer: - 48.
What is a testnet, and why is it important for blockchain developers?
Answer: - 49.
Can you explain the difference between on-chain and off-chain coding?
Answer: - 50.
How can you ensure that a blockchain application is GDPR compliant, considering the immutability of data?
Answer:
%20--%3e%3csvg%20version='1.1'%20id='Слой_1'%20xmlns='http://www.w3.org/2000/svg'%20xmlns:xlink='http://www.w3.org/1999/xlink'%20x='0px'%20y='0px'%20viewBox='0%200%20101%20101'%20style='enable-background:new%200%200%20101%20101;'%20xml:space='preserve'%3e%3cstyle%20type='text/css'%3e%20.st0{fill:%23FFFFFF;}%20%3c/style%3e%3cpath%20class='st0'%20d='M80.1,90c0.7,0,1.2-0.6,1.2-1.4c0-0.8-0.5-1.4-1.2-1.4H14.8c-2.7,0-4.9-2.5-4.9-5.6V15.2c0-0.8-0.5-1.4-1.2-1.4%20c-0.7,0-1.2,0.6-1.2,1.4v66.3c0,4.7,3.3,8.5,7.3,8.5H80.1z'/%3e%3cpath%20class='st0'%20d='M91.6,11H66.1c-0.7,0-1.2,0.6-1.2,1.4c0,0.8,0.5,1.4,1.2,1.4h22.7L63,43.7l-20.7,1.7l-0.7,0.4L22.4,67.7%20c-0.5,0.4-0.6,1.4-0.2,2c0.4,0.6,1.2,0.7,1.7,0.3c0.1-0.1,0.1-0.1,0.2-0.3l18.6-21.4l20.7-1.7l0.7-0.4l26.2-30.2v26%20c0,0.8,0.5,1.4,1.2,1.4s1.2-0.6,1.2-1.4V12.4C92.8,11.6,92.3,11,91.6,11z'/%3e%3c/svg%3e){kind=small}
%20--%3e%3csvg%20version='1.1'%20id='Layer_1'%20xmlns='http://www.w3.org/2000/svg'%20xmlns:xlink='http://www.w3.org/1999/xlink'%20x='0px'%20y='0px'%20viewBox='0%200%2044.5%2044.5'%20style='enable-background:new%200%200%2044.5%2044.5;'%20xml:space='preserve'%3e%3cstyle%20type='text/css'%3e%20.st0{fill:none;stroke:%23202020;stroke-width:1.498;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:3.994;}%20.st1{fill:none;stroke:%23202020;stroke-width:1.498;stroke-linecap:round;stroke-miterlimit:10.005;}%20%3c/style%3e%3cpath%20class='st0'%20d='M11.4,28l11-11.5L33.1,28'/%3e%3ccircle%20class='st1'%20cx='22.2'%20cy='22.2'%20r='21.5'/%3e%3c/svg%3e){kind=small}