Blockchain Interview Questions & Guide – Prepare for Crypto & Web3 Jobs

ERC-721 is a standard for non-fungible tokens (NFTs) that defines a specific function interface. It contains the following properties and methods. name(): returns the name of the token.symbol(): returns the symbol of the token.balanceOf(): returns the number of tokens owned by an account.ownerOf(uint256 tokenId): return the owner of the token with the specified tokenId.safeTransferFrom(address from,…

A standardized implementation of a smart contract that defines a common set of rules for all ERC20 tokens to interact seamlessly between wallets, exchanges, and smart contracts. It has the following properties and methods:

Web 1.0: Information feedingThe Internet is basically a “read-only” model, where Internet users can log on to major portals to browse and read any fresh information they want, but they can only see and not interact with it. Web 2.0: Information InteractionUsers can produce and distribute their own content and become influential Vs, directly affecting…

Gas is a unit of measure that is primarily used to calculate the amount of work required in a contract transaction. It is generally paid to the miner/verifier as a reward fee. The higher the Gas fee given, the faster that transaction will be. A certain amount of Gas is consumed for each transaction to…

The mainnet is the network node where Ethernet runs, and it is real data. The test network is for development and testing, and the ehter on it has no value. Sidechain: Because of the limited resources on the main network, slow block speed (generally 12 seconds to generate a block), high transaction fees gas and…

Ethernet is a public blockchain platform using blockchain technology. Ethernet has EVMs to run smart contracts. (A smart contract is a program developed with Solidity) Ether has its own tokens as well. PS1:Ether is a public blockchain network with a broad vision. The designers of Ether realized that if you build a public blockchain network,…

Each block has a unique Hash value, which is generated based on the content of the block, and once the content is changed, the Hash value of that block also changes. Each block contains the hash value of the previous block. If you modify the content of a block, the Hash of the block is…

First of all, the user first initiates a transaction, at which time the data will not be immediately written to the blockchain, to first go through a consensus algorithm mechanism, through which the consensus algorithm is successfully verified, the data will be on the chain. Then it is broadcasted to other nodes on the chain….

Blockchain is a distributed ledger database technology. It is mainly composed of blocks and chains. The block contains specific transaction data information, and the content of each block will generate a unique hash according to sha256, and the header of each block contains the hash of the previous block. The chain is responsible for linking…