Starknet mainnet faces fresh downtime as team investigates
Starknet, an Ethereum layer-2 network using zero-knowledge (ZK) rollups, is experiencing new mainnet downtime as the project enters 2026. In an X post, the team said engineers are actively investigating the issue and working to restore full functionality, without immediately disclosing a root cause. At the time of writing, the outage had lasted just over two hours.
Starknet is a ZK-rollup–based layer 2 that batches transactions off-chain and submits cryptographic proofs to Ethereum, aiming to provide higher throughput and lower fees for smart contracts, decentralized finance, and gaming while leveraging Ethereum’s base-layer security.
The project has also highlighted a BTCFi initiative, positioning its infrastructure to enable Bitcoin-related financial applications within the Ethereum ecosystem.
Previous Starknet mainnet outages
The latest disruption follows several outages in 2025 that put Starknet’s reliability under scrutiny. In September, a major upgrade known as Grinta (v0.14.0) resulted in a prolonged mainnet incident during which block production halted and two chain reorganizations were required, reverting around an hour of activity and requiring users to resubmit affected transactions. This incident is detailed in a blog post on Starknet’s website.
That event came after an earlier multi-hour outage in 2025 linked to sequencer issues, with external trackers recording multiple periods of slow or halted block creation throughout the year.
An incident report on the September disruption stated the Grinta-related downtime lasted roughly nine hours and was attributed to a sequence of problems, including failures in Ethereum RPC providers and bugs affecting sequencer behavior. The team committed to architectural changes and expanded monitoring.
A Starknet representative said the team is working to resolve the latest incident.
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