Sui Blockchain Resumes After Outage, Ensures User Funds Remained Secure

The SUI blockchain experienced a 6-hour outage on January 14 due to an internal divergence in validator consensus processing, halting transactions and block production.

Incident Details

Validators could not agree on a single checkpoint digest, causing transaction execution to stall.
The issue was not due to congestion or external attack, ensuring no loss of funds or inconsistencies.
RPC read requests continued serving the last certified state during the disruption.

Resolution Process

Engineers identified and corrected the divergence point, purging incorrect data.
Mysten Labs validated the fix before broader validator deployment.
Normal operations resumed after quorum checkpoint signing.

Impact and Community Response

Trading slowed but resumed as the network stabilized; SUI token fell 4% but rebounded to $0.87.
Concerns were raised about this being the second major outage since its 2023 launch.

Comparative Downtime

Solana: 6 outages (~58.5h total)
Sui: 2 outages (~8.5h total)
Aptos: 1 outage (~5h total)

Future Improvements

Enhanced detection of checkpoint inconsistencies.
Automation tools for state divergence resolution.
Expanded testing of consensus logic.

Sui confirmed that all safety guarantees were maintained, and the network is back to normal operation.