Key Takeaways

• Nova is being minimized, not closed.
• September 2 marks the end of the migration window.
• Canonical withdrawals remain available through the Portal.
• Fast bridge options may become scarcer.
• Phase 3’s full completion has not been confirmed.

September 2 is the scheduled end of the period during which Nova’s existing infrastructure remained fully operational while users and applications were encouraged to migrate. The ArbitrumDAO has approved a plan to reduce the network to a maintenance-oriented service, not remove it from operation.

What changes after the migration period

From June 4, applications, liquidity providers and regular users had a 90-day period to move to Arbitrum One with dedicated support available. That migration window matters because it was designed to give Nova users a predictable exit path before the network’s footprint shrinks. Phase 3 reduces Nova’s operating footprint after that period and shifts the network away from active ecosystem support.

What is confirmed

The DAO voted to minimize Nova, and the published migration window runs through September 2.

Afterward, the chain is expected to continue with less infrastructure and a maintenance-only support model.

What September 2 does not confirm

The implementation timetable in the approved proposal was marked tentative and subject to change.

Without a fresh Arbitrum update confirming each Phase 3 step, it is more accurate to describe the transition as scheduled rather than already complete.

For funds still on Nova, the exit route remains

For users with assets still on Nova, the published plan keeps the Arbitrum Portal and Canonical Bridge accessible in Phase 3. Arbitrum’s FAQ identifies this as the route available after the dedicated migration period ends, which is important for anyone still holding assets on the network once the broader support window closes.

For larger transfers, Arbitrum’s guidance uses a withdrawal through Ethereum before funds move to Arbitrum One. The process is slow by design, and the three stages below are the ones users need to plan for.

1. Official route

   Use the Arbitrum Portal to start the withdrawal from Nova.

2. Plan for the delay

   The standard challenge period is seven days before the Ethereum claim.

3. Move to One

   After claiming on Ethereum, bridge onward to Arbitrum One if that is the intended destination.

Fast bridges can be useful when speed matters, but Arbitrum describes them as third-party services. Their continued support for Nova is not guaranteed, and the FAQ warns that fewer of these options may remain once Phase 3 begins. That makes the canonical path more relevant for users who need a route that is explicitly covered by Arbitrum’s own guidance, even if it takes longer. They should be treated as a convenience, not as a permanent exit route.

$MOON is an exception. Arbitrum says there is no direct Nova-to-Arbitrum One bridge path for the token. Its FAQ directs holders to move $MOON to Ethereum first, wait through the seven-day confirmation period and then bridge it to Arbitrum One.

Nova moves to a smaller operating model

The operational changes focus on data availability and infrastructure. Nova is expected to move from active DAC coordination to a passive model in which the sequencer posts transaction data directly to Ethereum blobs. Its sequencer and validator setup is also due to shrink from redundant, higher-performance infrastructure to a leaner maintenance footprint.

Public services become less responsive

Arbitrum says the lower-footprint setup could mean reduced throughput, occasional service interruptions and longer response times for Nova-specific issues. Public infrastructure, including RPC endpoints, is expected to face stricter rate limits. Those changes matter most to projects that continue serving users on Nova rather than to someone making a one-off withdrawal.

The withdrawal clock may stretch

The seven-day challenge period itself does not change under the plan. However, Arbitrum says a leaner validator footprint could delay the posting of state assertions, potentially adding around 12 to 24 hours before that normal waiting period fully runs its course.

Why Arbitrum chose minimization instead of closure

Nova was launched as Arbitrum’s AnyTrust production proof of concept: a cheaper chain for consumer-facing activity such as games, social apps and micropayments. In the approved minimization proposal, Arbitrum argued that later improvements in data-availability economics and the wider Orbit-chain model reduced the need to keep Nova as a fully supported standalone network.

The same direction is visible elsewhere in the ecosystem. Robinhood first launched its Stock Tokens on Arbitrum One before moving to a dedicated chain built on Arbitrum’s technology, a path explored in our analysis of Robinhood Chain’s growth within the Arbitrum ecosystem.

The proposal cited approximately $20.37 million in TVL and about 0.03 transactions per second at the time it was drafted, against estimated annual operating costs of roughly $1.52 million. It projected that a minimized Nova could reduce those costs by about $1.43 million a year.

Those are proposal-era figures, not a measure of Nova’s current TVL. They explain why the DAO chose a smaller operating model rather than the full-service network it had been maintaining.

The transition changes the trade-off for anyone who remains on Nova. The published plan keeps the Canonical Bridge route while the network moves to lower capacity, slower assistance and less certainty around third-party bridges. September 2 ends the period designed to make leaving easy; under the plan, it does not end the ability to leave.

This article uses ArbitrumDAO and Arbitrum-owned guidance only. It is informational and not financial, legal or technical advice.