Web3 Proficiency Certification by Chainstack - Fast and Reliable Blockchain Infrastructure Provider

Web3 General Proficiency Certification

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1. What is the main purpose of a genesis block in blockchain?

A block that contains special transaction data.

The first block in the blockchain, from which all other blocks originate.

A block used for encrypting data.

A block that stores the blockchain's protocol.

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2. Running the following query on a full Ethereum mainnet node will return the account balance as of block 20000000.

{"method": "eth_getBalance", "params": ["0x690B9A9E9aa1C9dB991C7721a92d351Db4FaC990", "0x1312d00"]}

Hint: 0x1312d00 is block number 20000000 in hex.

False

True

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3. Pick one that fits the description of a network sequencer the most:

Order incoming transactions and seal them in blocks.

Facilitate cross-chain interoperability.

Make cross-contract messaging autonomous by removing the need for external messages.

Generate consensus among network nodes.

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4. Any EVM-compatible chain always has its mempool exposed to all network users.

True

False

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5.

Given the hash of a block but without being able to access the actual block contents, I can reconstruct the block contents based on the hash.

True

False

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6. Which of the following protocols can execute parallel transactions?

Solana

Arbitrum

Ethereum

Polygon

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7. What does EVM stand for in Ethereum?

Ethereum Voting Mechanism

Ethereum Virtual Machine

Ethereum Value Module

Ethereum Verification Method

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8. Which of the following types of fast food is associated with a MEV attack?

Subway sandwiches

Taco Bell rollups

McDonald's tendies

KFC Zingers

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9. Identify blockchain networks by the following keywords and order them chronologically from earliest to latest.

Use the mainnet launch as a date for the chronological ordering.

1. EVM

2. Rust

3. Optimism

4. POW

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10. Which one of the following is true for the blob transactions on Ethereum?

Anyone can send a blob transaction with random data in it.

Blob data in its entirety is stored by all network participants forever.

Blob data is validated by the Ethereum validators for correctness in the L2 context.

Blob data transactions are only accepted by the Ethereum network participants if these transactions originate from the L2 sequencers.

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11. With the currently available resources in the Web3 industry, I can instantiate and run my own Layer 1 blockchain network.

True

False

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12. What is a multisig wallet?

A wallet with multiple levels of encryption.

A wallet that requires multiple signatures to authorize a transaction.

A wallet that supports multiple cryptocurrencies.

A wallet that uses multi-factor authentication (MFA).

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13. When I look at this picture as a Web3 developer, all I can think of is:

Starknet

Polygon

Solana

Ethereum

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14. What does ERC stand for?

Ethereum Request for Comment

Ethereum Runtime Contract

Ethereum Relay Contract

Ethereum Routing Code

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15. The purpose of a blockchain faucet is to:

Drip coins or tokens to increase the user base & network adoption.

To farm airdrops.

Both to increase the user base & network adoption and to let developers test stuff.

Drip coins or tokens for developers to test their stuff.

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16. Why perform blockchain indexing?

To add an extra layer of data security to Web3 by centrally preserving the data.

To make the blockchain data retrievable and serveable in a non-computationally intensive way.

To be able to store large data on blockchain networks.

To provide verifiable data availability.

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17. What is a fork in the context of a blockchain network?

A type of cryptographic key.

A split in the blockchain creating two separate chains.

A process of encrypting data.

A method of transaction validation.

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18. With the currently available resources in the Web3 industry, I can instantiate and run my own rollup blockchain network.

True

False

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19. One Web3 developer to another: "Hey, let's deploy an ERC-721 on Solana".

What do they really mean?

ERC-20

SPL with only one minted token

SPL with more than one minted token

ERC-1155

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20. Which of the following best describes account abstraction?

An abstracted account is inherently private.

An abstracted account is always a smart contract.

Account abstraction is a method for compressing account data to cost-effectively serve in a rollup.

Account abstraction is a way to merge multiple blockchain accounts into one.

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21. What is a metamorphic smart contract?

A contract pattern that makes the contract mutable through SELFDESTRUCT.

A contract pattern that makes the contract self-destruct after a certain period.

A contract pattern implemented according to the ERC-6551 standard for use in metaverses.

A contract pattern that used to make the contract mutable through SELFDESTRUCT but not anymore after Dencun.

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22. What is OpenZeppelin?

OpenZeppelin is a library of secure smart contracts.

OpenZeppelin is a platform for creating decentralized autonomous organizations (DAOs).

OpenZeppelin is a protocol for cross-chain interoperability.

OpenZeppelin is a smart contract security protocol.

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23. What does bridging mean in the context of blockchain?

Storing data off-chain.

Encrypting data across multiple blockchains.

Connecting different blockchain networks to allow interoperability.

Creating new blocks on the blockchain.

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24. What is the main difference between a public and a private blockchain?

Public blockchains are accessible to anyone, while private blockchains have restricted access.

There is no difference.

Public blockchains require permission to join, private do not.

Public blockchains are used for government purposes, private for businesses.

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25. You have a new Ethereum account that you have never used. You use it to deploy a smart contract on Ethereum mainnet and then on the Ethereum testnet (or vice versa).

Will the deployed contract have the same address on the mainnet and the testnet or will the addresses be different?

Same address on both the mainnet and the testnet.

If I deploy on the mainnet first and then on the testnet, then the address will be the same on both networks. Otherwise the address will be different.

The address will always be different because the mainnet and the testnet have different chain IDs.

If I deploy on the testnet first and then on the mainnet, then the address will be the same on both networks. Otherwise the address will be different.

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26. You can't run a validator node on Ethereum without running an archive node.

False

True

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27. Which of the following is true for a DEX?

DEX transactions are always faster than centralized exchange transactions.

Anyone can interact with a DEX regardless of whether there is a live front-end instance running or not.

Users need to trust the DEX with their private keys.

DEXes are precompiles on the Ethereum mainnet.

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28. What is the role of a node in blockchain?

To speed up transactions.

To provide access to the blockchain network.

To secure the network through active production of new blocks.

To serve historical data to in real time.

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29. Which of the following is true for Ethereum testnets?

Ethereum testnets are used for testing and development purposes.

Ethereum testnets shadow the mainnet and always have the same set of contracts deployed as the mainnet.

An Ethereum mainnet transaction is always processed by a testnet first to make sure it's valid and can go through on the mainnet.

Testnet ether can never have value as there is no way to set up a sufficiently decentralized exchange mechanism for mainnet ether to testnet ether.

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30. Which of the following best describes the role of oracles?

Oracles facilitate peer-to-peer transactions without intermediaries.

Oracles verify the identity of network users.

Oracles enable sharding to improve blockchain scalability.

Oracles provide external data to smart contracts.