Chain Game Company Interview Question

Jul 25, 2023#Web3 #Blockchain #NFT #DeFi #DAO #DApp #区块链 #區塊鏈 #加密货币 #DeGame #链游 #Crypto #比特币 #以太坊 #Ethereum #合约开发354

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This is a summary of a conversation and code related to a gaming company. The conversation includes discussions about contracts and an interview that covers self-introduction, project experience, and the principles of Chainlink VRF and proxy contracts. Chainlink VRF is explained as a decentralized network where nodes obtain data and reach consensus using a median consensus method. Proxy contracts are described as a way to upgrade a contract by modifying its content without changing its memory layout. The code provided is a Solidity contract that includes functions for permission control, ownership transfer, event management, and minting tokens.

It is said to be a chain game company, but the main questions are not about games, but about contracts.
Interview: Simple self-introduction + projects on the resume + chainlink vrf principle + proxy contract principle.
Chainlink vrf principle: Chainlink Oracle is a decentralized network with many oracle nodes in the network. Each oracle node can obtain data through its own channel and reach consensus on the obtained data in the decentralized network. The consensus method used is the median. The user passes a seed to the VRF contract, and the oracle VRF node uses its private key and seed to generate a random number and proof, which are returned to the VRF contract. The VRF contract verifies the legitimacy of the proof of the random number. If the verification passes, the random number will be returned to the user.
Proxy contract principle: The user interacts with contract A, and contract A calls contract B. Contract A is a proxy contract, and contract B is a logic contract. If you want to upgrade, just change the content of contract A, but during the upgrade process, you cannot change the memory layout of contract A, you can only add, not delete or modify.
Written test: Permission control + ownership transfer + modifier + event switch + IERC20 transfer + whitelist (bonus) + EOA (bonus)