A few days ago, the DVP Global Hacking Competition Korea Station officially ended. LeeKyutaek, representative of HAECHI LABS, a well-known smart contract audit company in South Korea, said in his speech that with the increasing diversity of smart contract services, not only the security of smart contracts, but also the service architecture needs to consider more factors. For the recent security incidents in Synthetix, when developing the services related to smart contracts, not only the smart contracts themselves, but also some information information imported from outside should be paid attention to. "PeckShield vulnerability research director Edward Lo said that friends who are interested in the public chain need to learn at least one language in golang or rust, both of which are best. And more important is to understand the business behind DApps or the public chain." Logic, understand why and how they are designed and implemented.