Ontology has temporarily halted mainnet block production after its core developers identified a potential security concern during a routine security check. According to the official announcement, the team detected the potential issue during a daily security check and immediately moved to stop block production as a precaution. The mainnet halt occurred on August 31 (UTC+8), as confirmed by the Ontology blog. No security incident has been confirmed, and the team said it has found no evidence that ONT, ONG or other user assets have been lost or compromised. The pause represents a preventive security measure, not a response to any confirmed asset loss or ongoing attack.
With block production stopped, transactions submitted to the Ontology mainnet cannot be processed until network operations resume. The team has not provided an estimated time for the restart and said the review will take priority over restoring the chain quickly. Users have been told not to move ONT, ONG or other assets because of the announcement, and the network advised against attempting time-sensitive on-chain transactions while the pause remains in place. The suspension of on-chain transactions has been caused by the urgent investigation, with no timeframe specified for network restart.
The network emphasized that the current investigation has not produced evidence of compromised user funds. As reported by the team, there is currently no indication of any loss or compromise of user assets. ONT, ONG, and other on-chain assets remain unaffected based on their current assessment. The distinction leaves the mainnet in an unusual operational state: the chain is intentionally unable to process transactions, but Ontology has not reported an exploit, unauthorized asset movement or an ongoing attack.
Ontology described the halt as a preventive measure, distinguishing it from a response to an active attack or confirmed theft. Developers and network validators are conducting a comprehensive security review of the network and related components to determine whether the potential concern presents an actual security risk. The team is working with validators and relevant ecosystem partners during the investigation, and any upgrades found necessary during the investigation would have to be completed before the restart. Separate announcements will be issued before and after network restoration to keep users informed.
The team has not disclosed the technical nature of the potential security concern, which component triggered the review or whether developers have identified a vulnerability requiring a software change. Normal block production will resume only after the network has been sufficiently assessed and deemed safe to operate. The team did not specify whether an upgrade is currently expected or whether the review could end without requiring changes to the network software. Users should refrain from any transactions involving ONT, ONG, or other on-chain assets and should follow updates from the network's official channels for further developments.
