Blockchain Developer Token Standards and Creation Questions and Answers

Question 1

A developer is creating a decentralized application for a video game that includes both a fungible in-game currency (like 'gold coins') and unique, non-fungible in-game items (like a 'legendary sword').
To optimize for gas fees and contract management, which token standard would be the most efficient choice for this scenario?

Accepted Answer

ERC-1155, which can manage multiple token types (both fungible and non-fungible) within a single contract.

Answer

Deploying two separate contracts: one ERC-20 for the currency and one ERC-721 for the items.

Answer

ERC-20, with a mapping to track ownership of unique items off-chain.

Answer

ERC-721, representing the fungible currency as a large collection of identical NFTs.

Question 2

When a user interacts with a DeFi protocol to stake their ERC-20 tokens, they typically must first call the `approve()` function on the token contract. What is the primary purpose of this function call?

Accepted Answer

To grant the staking contract permission to transfer a specified number of tokens on the user's behalf.

Answer

To directly transfer the tokens to the DeFi protocol's staking contract.

Answer

To verify that the user has a sufficient token balance for the transaction.

Answer

To mint new tokens that will be used as a reward for staking.

Question 3

Which of the following statements accurately describes a key characteristic of the ERC-721 token standard?

Accepted Answer

Every token is uniquely identifiable by a `tokenId` and represents a single, distinct asset.

Answer

Each token is fungible and interchangeable with other tokens from the same contract.

Answer

It is primarily used for creating stablecoins and utility tokens.

Answer

It supports batch transfers of multiple unique tokens in a single transaction to save gas.

Question 4

In the context of creating a new ERC-20 token using a standard library like OpenZeppelin, what is the process of generating the initial set of tokens and assigning them to a specific address called?

Accepted Answer

Minting

Answer

Approving

Answer

Burning

Answer

Swapping

Question 5

A developer is creating a token contract and wants to implement a mechanism to decrease the total supply over time, potentially to increase the token's scarcity. What is the standard term for the action of permanently removing tokens from circulation?

Accepted Answer

Burning

Answer

Locking

Answer

Freezing

Answer

Staking

Question 6

Which function is mandatory in a compliant ERC-20 token contract and is used to retrieve the token balance of a specific address?

Accepted Answer

`balanceOf(address owner)`

Answer

`getTotalBalance(address owner)`

Answer

`getAmount(address owner)`

Answer

`checkBalance(address owner)`