Flow get a list of stocks -> fetch from backend which will fetch from IB buy a stock -> frontend will call blockchain: approve + create buy order -> backend will listen for CreateBuyEvent? from blockchain -> backend will trigger buying stock from IB for a given USDC at a current market price -> backend will call blockchain: mint token to the user sell a stock -> frontend will call blockchain: approve + create sell order -> backend will listen for CreateSellEvent? from blockchain -> backend will trigger selling stock from IB for a current market price