Explorer sometimes shows negative balance for a bit?

[lukaw3d]

• got 10 rose, explorer showed tx, but balance still 0, refreshed 3 times, balance 10
• sent 9.8 rose, explorer showed -9.8 balance, ??, refreshed 1 time, showed 0.2 balance

TODO: try to reproduce

[ptrus]

is this for sapphire or consensus?

[lukaw3d]

Sapphire, happened on this fresh account https://explorer.dev.oasis.io/mainnet/sapphire/address/0xA7Af2f000C84589e28FF91c52570C1F9c3E7234d

[ptrus]

Negative balances can occur in general due to the nature of dead-reckoning - if the analyzer lags or processes blocks out of order (e.g., in fast-sync mode), a send could be applied before the corresponding receive, resulting in a temporary negative balance.

However, for this specific transaction (simple evm.Call native transfer with empty data):

• Both the receive (+10 ROSE) and send (-9.8 ROSE) use the same code path for balance updates via TokenBalanceChanges
• Both are committed in atomic database batches per block
• Blocks should have been processed in order (no fast-sync)

Given this, the negative balance shouldn't have occurred from the Nexus side for this transaction type.

Is there any frontend caching or client-side code in the explorer that computes/displays balances? That could explain the temporary -9.8 display.

If you encounter more examples of this issue, please share them.

(potentially it could have been related to #1230 but likely not)