1、What is a blockchain?

A distributed database that maintains a continuously growing list of ordered records called blocks

2、What is a hash?

✅ Correct answer: 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?

✅ Correct answer: 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?

✅ Correct answer: It allows programs to use information from the blockchains faster

6、What is the main purpose of sharding?

✅ Correct answer: Blockchain scalability

7、What is the purpose of a bridge?

✅ Correct answer: Interoperability among blockchains

8、Which of these is not a blockchain?

✅ Correct answer: Nansen

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?

✅ Correct answer: 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?

✅ Correct answer: Code provides the rules for how broader society interacts in cyberspace

15、What can you not do with an NFT?

✅ Correct answer: Use it as a stablecoin

16、What is an NFT marketplace?

✅ Correct answer: A platform that makes it simple to trade and buy NFTs and see their ownership

17、What is a whitelist?

✅ Correct answer: A list of wallets or contract addresses that will receive digital assets or tokens

18、Which of these is a standard for collections of unique NFTs?

✅ Correct answer: ERC-721

19、Which standard combines the functions of ERC-20 and ERC-721?

✅ Correct answer: ERC-1155

20、What is minting?

✅ Correct answer: The process of creating a new NFT on chain

21、What is a token?

An asset built on an existing blockchain using smart contracts

22、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?

✅ Correct answer: 0,000063 ETH

23、What is Wrapped Bitcoin (WBTC)?

A token

24、Which of these is a stablecoin?

DAI

25、Which of these is a real on-chain market indicator?

✅ Correct answer: Coin Days Destroyed

26、Why is the Howey test important for crypto?

✅ Correct answer: 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

27、Who has the keys to a non-custodial wallet?

The users themselves keep both public and private keys

28、What is the safest private key storage?

✅ Correct answer: Hardware wallet

29、What is the main trade-off for having a non-custodial wallet?

✅ Correct answer: It is impossible to recover digital assets if a private key is compromised

30、What problem does Gnosis Safe solve?

Security of digital assets if a private key is lost

31、What wallet address is compatible with Ethereum?

✅ Correct answer: 0xc098b2a3aa256d2140208c3de6543aaef5cd3a94