What is the role of finality in cross-subnet operations?

• A. Finality allows rollbacks in case of error.
• B. Finality sets transaction fees.
• C. Finality ensures cross-subnet messages and asset transfers are irreversible once confirmed, maintaining consistency.
• D. Finality has no impact on cross-subnet communications.

Answer: (C)

Finality in cross-subnet operations means that once a cross-subnet message or asset transfer is confirmed, it cannot be undone. This permanence is what keeps all involved subnets in sync: after finality, the state across subnets reflects the same outcome, so there’s no risk of double-spending or conflicting records. The idea is that the transfer becomes effectively atomic and irreversible—the asset leaves the source and appears on the destination in a single, permanent step. This assurance comes from the subnet’s consensus mechanism or a finality gate that certifies settlement, so no later reversal can undermine the completed transfer. Without finality, cross-subnet actions could be rolled back or altered, leading to inconsistencies and eroding trust in cross-subnet operations. So finality’s role is to ensure cross-subnet messages and asset transfers are irreversible once confirmed, maintaining consistency.