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1. What is a blockchain?
A distributed database that maintains a continuously growing list of ordered records called blocks
2. What is a hash?
A fixed number of characters produced by an algorithm and used to secure blockchain transactions
3. What is the most accurate description of a block?
A collection of transactions on a chain
4. Which of these statements about PoS is true?
Validators check transactions and add new blocks to the blockchain
5. How does the node infrastructure work?
It allows programs to use information from the blockchains faster
6. What is the main purpose of sharding?
Blockchain scalability
7. What is the purpose of a bridge?
Interoperability among blockchains
8. What is Lightning Network used for?
For blockchain scalability
9. What is a smart contract?
A program that runs on a blockchain when predetermined terms and conditions are met
10. Which language is native for smart contracts development on Solana?
Rust
11. Which tool allows smart contracts to monitor data from the real world?
Oracle
12. Which of these statements about Ethereum and Polygon are true?
Both are EVM compatible
13. What is a DAO?
A smart contract/group of smart contracts describing organizations, their membership system, tokens, NFTs, and wallets governance
14. What’s the idea behind the “code is law” concept?
Code provides the rules for how broader society interacts in cyberspace
15. What is Wrapped Bitcoin (WBTC)?
A token
16. What is a token?
An asset built on an existing blockchain using smart contracts
17. How much do you need to pay for a transaction, assuming that the transaction sent to Ethereum requires 21 000 gas and 1 gas costs 3 Gwei?
0,000063 ETH
18. Which of these is a stablecoin?
DAI
19. Which of these is a centralized token exchange (CEX)?
Kraken
20. Why is the Howey test important for crypto?
It determines whether a cryptocurrency transaction qualifies as an "investment contract" and is therefore subject to U.S. securities laws, meaning it will be highly regulated
21. Who has the keys to a non-custodial wallet?
The users themselves keep both public and private keys
22. What is the safest private key storage?
Hardware wallet
23. What is the main trade-off for having a non-custodial wallet?
It is impossible to recover digital assets if a private key is compromised
24. What problem does Gnosis Safe solve?
Security of digital assets if a private key is lost
25. What wallet address is compatible with Ethereum?
0xc098b2a3aa256d2140208c3de6543aaef5cd3a94
26. What can you not do with an NFT?
Use it as a stablecoin
27. What is an NFT marketplace?
A platform that makes it simple to trade and buy NFTs and see their ownership
28. What is a whitelist?
A list of wallets or contract addresses that will receive digital assets or tokens
29. Which of these is a standard for collections of unique NFTs?
ERC-721
30. Which standard combines the functions of ERC-20 and ERC-721?
ERC-1155
31. What is minting?
The process of creating a new NFT on chain
32. Which of this is not a blockchain?
Nansen
33. Which of this is a real on-chain market indicator?
Coin Days Destroуer
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