The hottest topic in the crypto industry seems to be DeFi. It goes without saying that the essential key takeaway in Web3 is ownership and proof of existence. Although it looks the new waves are coming one after another, such as NFTs, Metaverse, GameFi, these all are basically on top of DeFi because human being measures the value of the ownership and the proof by quantitative indication. In other words, DeFi is now the infrastructure of the crypto industry.