There's a DeFi lottery project that's quite interesting. It was originally based on the open-source code "Lucky Koi," but the developer later shut it down. However, a team thought the concept was good, just with some flaws in timing and mechanism, so they created an upgraded version.

The improvements in the new version are worth checking out — each lottery cycle is shortened to 10 minutes, with 3 winners selected each round. It introduces VRF randomness to ensure fairness, which is more reliable than traditional pseudo-random methods. The iterative process from concept to implementation reflects the rapid evolution of Web3 projects.