Summary

The report addresses considerations related to indexing event fields within smart contract.

Vulnerability Details

Index event fields make the field more quickly accessible to off-chain tools that parse events. However, note that each index field costs extra gas during emission, so it’s not necessarily best to index the maximum allowed per event (three fields).

Impact

The impact of the vulnerability lies in the potential inefficiency of off-chain data processing.

Tools Used

Manual Review

Recommendations

Each event should use three indexed fields if there are three or more fields, and gas usage is not particularly of concern for the events in question. If there are fewer than three fields, all of the fields should be indexed.