Mystery Box

Summary

The contract currently does not emit any events when important actions, such as box purchases, reward claims, or withdrawals, take place. Event emission is critical for logging and off-chain tracking by dApps, wallets, and analytics services, ensuring transparency and traceability for users and developers.

Vulnerability Details

The MysteryBox contract does not emit event in any of it's function implementation.

In Solidity, events play a pivotal role in providing a log of significant contract interactions that can be easily tracked off-chain. Without the inclusion of these events, users, developers, and external services will find it challenging to monitor key activities such as when a user purchases a box, opens it, claims rewards, or when the owner withdraws funds from the contract. This lack of event emission can hinder the ability to trace the contract’s activity and debug potential issues, reducing overall transparency and user trust in the system.

Impact

The absence of event logs can result in user frustration and reduced trust in the contract due to the lack of visibility into their interactions.

Without events, the contract lacks transparency, making it difficult for users, developers, and third-party services to track important actions like box purchases, reward claims, and fund withdrawals. This leads to challenges in monitoring, auditing, and off-chain integration, while also complicating debugging.

Event emission is important for ensuring clear, transparent, and easily trackable contract activity

Tools Used

Manual Review

Recommendations

I recommend you consider emitting events for the following critical actions:

• When a user purchases a mystery box (buyBox()).

• When a user opens a box and wins a reward (openBox()).

• When a user claims all of their rewards (claimAllRewards()).

• When a user claims a single reward (claimSingleReward()).

• When the owner withdraws funds from the contract (withdrawFunds()).

By doing this, contract interactions will be traceable and easier to monitor, improving both the user experience and debugging process.