Knowledge quiz

It’s time to put what you’ve learned to the test, get 8 questions right to pass this week.

Which of the following statements about "layer 2" are true?

There are two correct answers.

It is an alternative blockchain that works better and costs less.

It is used only when a database is needed to provide functionalities that are missing in blockchain.

It is a way to avoid high fees or long processing times by doing some work outside of the main blockchain.

It often works by putting together several transactions under a single hash, which is then used on the main blockchain.

Which part of the carbon offsetting business did the Toucan solution made redundant?

Choose the correct answer.

The organizations active in the trade of carbon data

The process of certifying each tree

The choice of where carbon offsetting could have the most sustainable results in terms of geography

The creation of NFTs for carbon data

In the example of the 3D printer being bought through a smart contract, what would be a typical way to make money from the smart contract?

Choose the correct answer.

In the smart contract code, include a way to take a certain percentage of sales and send it to a certain cryptocurrency wallet.

The person who owns the code asks for two forms of payment: one for himself and one for the smart contract.

Draw up an outside contract with all the suppliers who will receive the orders and send money back to the owner.

Give buyers a discount on their next purchase as a way to keep them coming back.

In the context of smart contracts, what are the two examples that would result in the highest blockchain transaction fees?

There are two correct answers.

A complex code with many lines using the solidity language

A smart contract requiring several steps and logic when being executed.

A smart contract that would only interact with transactions over 100,000 Ether

Tracking all the transactions of a smart contract with an external software

What is the difference between crypto tokens and native crypto?

There are two correct answers.

Native cryptocurrency is made by mining or staking, while crypto tokens are made by smart contracts.

The primary blockchain technology generates the native cryptocurrency, whereas the crypto tokens are an enhanced feature.

Native crypto is the first type of cryptocurrency, like blockchain. Crypto tokens, like Ethereum, are more advanced.

Native crypto is used for the financial parts of cryptocurrencies, while crypto tokens are used in the metaverse.

When making game piece tokens, native crypto is often used for embroidery services in the clothing and retail industries.

Which functionality exists in the Ethereum blockchain that allows smart contracts?

Choose the correct answer.

The Ethereum virtual machine, which facilitates computations

The dual miner-staker approach's potential to achieve blockchain immutability

The ability to consume logic written in the Solidity Programming Language

The Ethereum virtual compiler, to comprehend human-readable source code

What´s the main objective of the Enterprise Ethereum Alliance?

Choose the correct answer.

To drive the use of Ethereum to empower all enterprises

To develop new Ethereum functionalities

To foster collaboration between the Ethereum and other blockchains

To release the latest Ethereum uses cases to the public

What is the key difference when using a decentralized application compared to a traditional software-based application?

Choose the correct answer.

Instead of a database, it interfaces with a blockchain smart contract.

It is an application that needs a peer-to-peer user network to work.

It is a different term for a smart contract.

It is a software program that can only be written in the Solidity Programming Language.

Which of the following tokens is an NFT (non-fungible token)?

Choose the correct answer.

ERC721 Token

ERC20 token

USDC

DAI

10.

Which layer 2 was utilized in the OpenSea demonstration?

Choose the correct answer.

Polygon

Blockchain

Etherscan

MetaMask