Ответы на вопросы к Supra Oracle

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?

• 0x

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

34. What do blockchain smart contracts need oracles for?

• All of the above