Spoiler alert: Do not attempt this level before solving level 04 - tipjar. This task builds on top of it and reveals the idea of the vulnerability.
The code and the goal of this level are both similar to the tipjar. The validator is updated to mitigate two attack vectors present in the previous version. However, we believe that it is still possible to perform a DoS attack on the Tip Jar and prevent other people from tipping. Can you find and demonstrate the vulnerability?
Some solutions might pass in the emulator but not on the testnet. Always verify your solution on the testnet as well.
If your solution from the tipjar passes here as well, try to go back and find a different attack vector for the first version of the tipjar.