Summary

block.timestamp works differently on arbitrum, which can affect the prediction timing in some cases.

Vulnerability Details

As per arbitrum documentations

To limit the degree to which the sequencer can adjust timestamps, some boundaries are set, currently to 24 hours earlier than the current time, and 1 hour in the future.

More Details Given in official Arbitrum documentation 1 ,2

Impact

Prediction can be started 1 day earlier or an hour later. similarly it can be stopped a day before or 1 hour later.

Tools Used

Manual Review

Recommendations

consider having adjstable variables for rounds, rather hardcoding it.