Arbitrum Explained: ARB Governance, Ethereum Scaling and Risks

Arbitrum is a family of networks and software designed to let applications use Ethereum's security while processing transactions outside Ethereum's main execution layer. ARB is the governance token associated with the ArbitrumDAO. It is not the currency used to pay ordinary transaction fees on Arbitrum One or Arbitrum Nova: those fees are paid in ETH.

That distinction matters before anything else. Using an Arbitrum application does not normally require holding ARB, and owning ARB does not automatically entitle someone to network fees. The token gives voting influence over decisions such as upgrades and treasury spending. The networks provide the execution environment.

Who built Arbitrum, and what does it connect to?

Offchain Labs developed Arbitrum. The company was founded in 2018 by Ed Felten, Steven Goldfeder and Harry Kalodner, whose work grew out of research at Princeton University. Arbitrum One opened publicly on August 31, 2021. The ARB token arrived later, with its user airdrop opening on March 23, 2023.

The ArbitrumDAO governs designated protocol contracts and treasury resources, while the Arbitrum Foundation supports the ecosystem. These roles are separate from the developers of individual applications. An app running on Arbitrum does not become an official project or inherit a promise that its contracts are safe.

Arbitrum One is a layer 2 network built above Ethereum. Its Nitro software supports Ethereum-compatible applications. Developers can reuse much of the tooling and contract code they already know, while users can interact through compatible wallets. The relationship between execution, settlement and bridges is explained in the guide to layer 2 networks.

How the rollup processes transactions

Arbitrum One uses an optimistic rollup. A sequencer orders transactions, nodes execute them, and compressed transaction data is posted to Ethereum. Validators can challenge incorrect claims about the resulting state. The system is optimistic because it accepts claims unless they are successfully disputed through the protocol.

This is different from a separate blockchain whose security comes from a new set of proof-of-stake validators paid in its own coin. Ethereum supplies the underlying consensus and settlement environment. Arbitrum adds its execution software, dispute mechanism and operational assumptions.

The BoLD dispute protocol went live on Arbitrum One and Nova on February 12, 2025. On One, it enabled permissionless validation, allowing participants meeting the protocol's requirements to challenge invalid claims without joining an approved validator list. Posting and defending claims still requires infrastructure and capital. Permissionless does not mean costless.

Sequencing remains a separate responsibility. Arbitrum's documentation identifies Offchain Labs as the sequencer operator. A mechanism for submitting transactions through Ethereum provides a fallback against censorship, but it does not offer the same immediate experience as a responsive sequencer.

Speed, fees and withdrawals measure different things

Documentation checked on October 31, 2026 describes 250-millisecond blocks on Arbitrum One. That interval is not a guarantee that every transaction completes in a quarter of a second. Network load, submission infrastructure and transaction ordering affect the user experience.

A sequencer confirmation is also different from finality on Ethereum. The transaction sequence must be posted to the parent chain and reach the appropriate finality there. A normal withdrawal through the canonical bridge adds another stage: its state claim must clear the dispute process. The bridge documentation tells users to allow at least seven days for withdrawals to Ethereum.

Fees cover execution on the Arbitrum chain and the cost of publishing data to its parent chain. They vary with resource use and conditions. ETH held on Ethereum is not automatically available to pay fees on Arbitrum One; balances belong to their respective networks.

Current dedicated documentation describes Priority Gas Auctions on One, replacing Timeboost's express-lane arrangement. Priority fees influence transaction ordering. This is an ordering policy operated by the sequencer, not decentralized sequencing. Faster third-party withdrawal services introduce their own liquidity and contract assumptions, covered in the guide to crypto bridges.

Arbitrum One and Nova are not interchangeable

One uses the rollup model, publishing transaction data to Ethereum. Nova launched in 2022 using AnyTrust, which reduces data costs by relying on a data availability committee. In that design, committee members store the data and certify its availability. The saving comes with an additional trust assumption.

Nova's direction changed in 2026. In its June 7 update, Arbitrum said the DAO had approved minimizing Nova, with a migration window running from June 4 through September 2. The approved plan moves the chain toward maintenance, reduced operational resources and a passive committee model with data posted to Ethereum blobs.

The plan preserves the network rather than fully shutting it down. Readers should distinguish Nova's original AnyTrust architecture from its approved operating transition. Its applications, bridge routes and support arrangements should not be assumed to match One's.

What ARB voting rights actually provide

ARB is an ERC-20 token whose canonical contract is on Arbitrum One. Holders can vote or delegate voting power to another participant. Voting is token-weighted, so larger represented balances carry more influence.

Governance covers protocol upgrades, treasury allocations and Security Council elections. Delegation helps holders participate through representatives, but it does not remove the need to understand what a delegate supports. A governance token is not a share in Offchain Labs, and paying ETH to use the network does not grant ARB voting power.

The Security Council has 12 members. Under the DAO constitution, nine signatures can authorize an emergency action without the ordinary delay. This is intended to address critical vulnerabilities, while creating a consequential trust relationship for users of upgradeable contracts.

Initial supply, unlocks and possible issuance

ARB launched with 10 billion tokens in 2023. Following governance proposals AIP-1.1 and AIP-1.2, the recorded allocation was 35.28% to the DAO treasury, 26.94% to the team, contributors and advisers, 17.53% to investors, 11.62% to users, 7.5% to the Foundation and 1.13% to ecosystem DAOs.

The original team and investor schedule included a one-year lockup followed by monthly releases over three years. Foundation tokens followed a separate four-year vesting arrangement beginning April 17, 2023. These are allocation and vesting facts, not a measurement of today's circulating supply.

Nor is 10 billion an immutable lifetime ceiling. Governance documentation allows the DAO to authorize annual issuance of up to 2%, with the first eligible mint date on March 15, 2024. Permission to mint is not evidence that the maximum was minted. Unlocking existing tokens, distributing treasury tokens and creating new tokens are different supply events.

Current development and the risks that remain

Arbitrum remains an actively developed ecosystem as of October 31, 2026. Nitro reached One in August 2022, and Stylus activated on One and Nova in September 2024, adding support for WebAssembly-based contracts alongside the existing Ethereum-compatible environment. The DAO's upgrade record lists ArbOS 61 Elara as executed on both networks on August 20, 2026.

Development does not remove risk. Software defects can affect contracts or bridges; sequencer disruptions can delay activity; governance concentration can influence upgrades and treasury decisions. Nova's reduced-support plan adds operational considerations specific to that chain. ARB itself remains exposed to market volatility, liquidity conditions, token distribution and governance decisions.

Finally, token identity matters. A familiar ticker or a past airdrop does not establish that a claim page is legitimate. The original ARB claim period ended on September 24, 2023. The guide to recognizing crypto scams explains the warning signs before a wallet connection becomes a token approval.