Ontology has temporarily halted mainnet block production after its core developers identified a potential security concern during a routine security check.No confirmed security incident or user asset loss has been identified, with ONT, ONG and other on-chain assets currently considered unaffected.On-chain transactions will remain unavailable during the security review, and users have been advised to avoid time-sensitive transactions.Ontology has not set a restart time and said block production will resume only after the network has been assessed and deemed safe.