Arbitrum Nova migration window closes, support declines

Key Points

Nova is being scaled back, not closed.

The migration window closes on September 2.

Standard withdrawals can still be made through the Portal.

Fast bridge options may become more scarce.

Whether the third stage is fully completed has not yet been confirmed.

The migration window will close on September 2, Nova will scale back operations

September 2 is the original end date, during which time Nova's existing infrastructure will remain fully operational, while encouraging user and application migration. Arbitrum DAO has approved a plan to reduce the network to a maintenance service only state rather than shutting it down completely.

Changes after the migration period

Starting June 4, applications, mobility providers and general users have 90 days to migrate to Arbitrum One with exclusive support. After the third phase, Nova's operating footprint will shrink and the network will no longer provide active ecosystem support.

Confirmed matters

The DAO voted to shrink Nova, and the announced migration window lasts until September 2. After that, the chain is expected to continue with less infrastructure and a maintenance-only model.

Matters not confirmed on September 2

The implementation timetable in the approved proposal is marked as "tentative" and may change. Without a new Arbitrum update confirming every step of the third phase, it would be more accurate to describe it as "planned transition" rather than "completed."

Funds remaining in Nova still have exit paths

For users whose assets are still on Nova, the announced plan will retain access to the Arbitrum Portal and Canonical Bridge in the third phase. Arbitrum's FAQs points out that this is the path that is available after the exclusive migration period ends.

For large transfers, Arbitrum's guidelines recommend withdrawing funds through Ethereum first and then transferring funds to Arbitrum One. This process is slow in design and users need to plan the following three steps:

1. Official path: Use the Arbitrum Portal to start withdrawing cash from Nova.

2. Planning delay: The standard challenge period is 7 days before you can claim it on Ethereum.

3. Transfer to One: After claiming it on Ethereum, if you need to transfer to Arbitrum One, you can complete it through bridging.

Rapid bridging is useful when speed requirements are high, but Arbitrum lists it as a third-party service. Continued support for Nova by these services cannot be guaranteed, and the FAQs warns that fewer quick bridging options may be available after phase 3 begins. Consider this a convenience tool rather than a permanent exit path.

$MOON is an exception

Arbitrum states that there is no direct Nova to Arbitrum One bridge path for this token. FAQs guide holders to first transfer $MOON to Ethereum, wait for a 7-day confirmation period, and then bridge to Arbitrum One.

Nova will move to a smaller operating model

Operational changes focus on data availability and infrastructure. Nova is expected to move from an active DAC coordination model to a passive model, with sorters publishing transaction data directly to the Ethereum Blob. Its sorter and validator configuration will also be reduced from redundant, high-performance infrastructure to a leaner maintenance footprint.

Common service response speeds drop

Arbitrum stated that a leaner configuration could lead to reduced throughput, service interruptions, and extended response times for Nova specific issues. Public infrastructure, including RPC endpoints, is expected to face stricter rate limits. These changes have a greater impact on projects that are still serving users on Nova, and have a lesser impact on users who withdraw one-time cash.

Withdrawal time may be extended

Under the plan, the 7-day challenge period itself remains unchanged. However, Arbitrum said a more streamlined verifier footprint could delay the submission of state assertions, potentially adding approximately an additional 12 to 24 hours before this normal waiting period ends.

Why Arbitrum chose to reduce rather than close

Nova was originally launched as a production-level proof of concept for AnyTrust for Arbitrum: a low-cost chain for consumer-level activities such as games, social apps and micropayments. Among the approved curtailment proposals, Arbitrum believes that subsequent improvements in the economics of data availability and a broader Orbit chain model have reduced the need for Nova as a fully supported stand-alone network. The same trend can also be seen in the ecosystem: Robinhood first launched its stock tokens on Arbitrum One, and then migrated to a dedicated chain built based on Arbitrum technology. The proposal states that Nova's TVL at the time of drafting was approximately US$20.37 million, with a transaction volume of approximately 0.03 transactions per second, and an estimated annual operating cost of approximately US$1.52 million. The proposal predicts that a downsized Nova will save approximately $1.43 million in costs per year. These data are from the proposal period and are not a measure of Nova's current TVL, but explain why the DAO chose a smaller operating model rather than maintaining a full-service network.

This transition changes the trade-off for any user who remains on Nova. The announced plan retains standardized bridging paths while the network will shift to lower capacity, slower assistance and the uncertainty of third-party bridging. September 2 ended the period intended to facilitate departures; under the plan, it did not end the possibility of departures.