Both chains borrow the same two things from Ethereum: a place to make transaction data publicly available, and a referee to settle disputes if someone claims a result is wrong. Everything els
Both chains borrow the same two things from Ethereum: a place to make transaction data publicly available, and a referee to settle disputes if someone claims a result is wrong. Everything else – who orders transactions, who can challenge them, and who holds the keys to upgrade the system – is decided separately by each chain’s own operator and governance structure, and Base and Arbitrum answer those questions differently.
An optimistic rollup separates two jobs that Ethereum normally does together, according to Arbitrum’s own documentation: running transactions and updating state (execution), and agreeing on the canonical result while keeping the underlying data retrievable (settlement and data availability). Arbitrum does the first job offchain and hands the second to Ethereum. ethereum.org’s explainer on optimistic rollups describes the same division: the rollup executes transactions on its own virtual machine, then posts transaction data to Ethereum as calldata or in blobs, so that anyone can reconstruct the rollup’s state and check it. ethereum.org’s page, which is undated, states this design can offer "up to 10-100x improvements in scalability" over running everything on Ethereum’s base layer directly.
Because the data lives on Ethereum, a challenger does not need to trust the rollup operator. If a posted result looks wrong, the challenger can construct a fraud proof from that public data and force Ethereum to arbitrate. That arbitration role, not the execution itself, is what "inherits Ethereum’s security" actually refers to.
Arbitrum One runs on Nitro, a modified fork of Geth, Ethereum’s most widely used client software, according to Arbitrum’s documentation. Eco.com reports that the Nitro stack is maintained by Offchain Labs and that Arbitrum One is operated by the Arbitrum Foundation with a token-governed Security Council, as of April 2026. Governance runs through the Arbitrum DAO: $ARB token holders and their delegates vote on proposals, and the Arbitrum DAO Glossary states that Arbitrum One has two chain owners with authority to upgrade core protocol contracts – the Arbitrum DAO and the Security Council.
The dispute mechanism is called BoLD. Per Arbitrum’s documentation, when two validators disagree about a transaction result, each side bisects its claimed history of commitments step by step until they isolate the single instruction in dispute, and Ethereum then rules on that one instruction rather than re-executing the whole batch. Arbitrum’s documentation states that only one honest validator is needed to keep the chain secure, because that validator can catch multiple malicious actors. Eco.com reports that BOLD activated permissionless validation in late 2025, meaning anyone can now run a validator and submit a fraud proof without joining a permissioned set, and that as of April 2026 Arbitrum was the only L2 that L2BEAT classified at Stage 1 on this basis. Eco.com also reports the Arbitrum Security Council has 12 members spread across multiple firms, as of April 2026.
Base runs on the OP Stack, the open-source rollup framework also used by Optimism’s OP Mainnet, and was incubated by Coinbase, according to Coinstancy (updated 8 March 2026). Coinstancy reports Base carries no native governance or utility token and uses ETH for gas, and that Coinbase has stated it has no plans to launch one. Changelly reports Base reached mainnet in August 2023 and, as of March 2026, was processing around 8.93 million transactions daily, though Changelly notes that figure is highly volatile. Changelly also reports that, as of February 2026, Base plans to move away from the OP Stack toward its own unified, Base-operated stack, which would change what Base draws from Optimism’s shared tooling going forward.
Coinbase controls Base’s sequencer, according to both Changelly and Eco.com. Eco.com reports that Base shares sequencer fee revenue with the Optimism Collective under a Superchain agreement, as of April 2026, and that Base’s Security Council includes Coinbase plus external members.
On decentralization stage, this evidence set contains a direct conflict. Changelly reports that in April 2025 Base became a Stage 1 rollup, having deployed a functional proof system and an independent Security Council able to override incorrect state roots. Eco.com, in an article dated 20 July 2026 describing conditions as of April 2026, reports Base sat at L2BEAT Stage 0, with fault proofs having shipped to Base mainnet in October 2024 but a Security Council multisig still holding upgrade authority. Both claims are attributed to their outlets here rather than resolved, because neither is L2BEAT’s own page and the two accounts disagree on which stage Base occupied roughly a year apart.
Inside either chain, ordinary transactions do not wait on Ethereum. The delay shows up specifically when moving funds back to Ethereum. Arbitrum’s documentation states a withdrawal from Arbitrum to Ethereum typically takes 6.4 days, while a deposit from Ethereum into Arbitrum carries no such delay, and a third-party fast bridge can skip the wait for a fee. Eco.com, describing both Base and Arbitrum as of April 2026, instead states that both chains allow a 7-day challenge window. Those two figures – 6.4 days per Arbitrum’s own documentation and 7 days per Eco.com – are not the same number, and this page states both rather than picking one.
ethereum.org’s explainer describes why the wait exists at all: after a batch is posted, there is a window during which anyone can compute a fraud proof against it; if the batch goes unchallenged, it is accepted as final on Ethereum. Eco.com adds that on both Base and Arbitrum, users can force a transaction through via Ethereum directly if the sequencer refuses to include it, though Eco.com describes this route as impractical for active use given the multi-day delay involved.
Marketing language that says a rollup "inherits Ethereum’s security" is easy to read as meaning the rollup is as decentralized as Ethereum itself. The evidence here does not support that reading. What Ethereum guarantees is that the underlying transaction data stays available and that a dispute, once raised, gets settled by Ethereum rather than by whoever runs the chain. It says nothing about who can produce blocks in the first place, who can pause the sequencer, or who holds the keys to change the contracts. On those questions, Arbitrum runs a token-governed DAO with a Security Council and, per Eco.com, a permissionless validator set as of April 2026, while Base runs on a Coinbase-operated sequencer with no governance token, per Coinstancy and Changelly, and a Security Council whose upgrade authority Eco.com describes as still centralized as of the same date.
This page cannot tell a reader which chain has more total value locked, lower fees, or more daily users right now. The figures cited – Base and Arbitrum’s L2BEAT-reported TVL of $4.6B and $1.3B respectively as of April 2026, and Base’s roughly 8.93 million daily transactions as of March 2026 – are dated snapshots pulled from secondary sources (Eco.com and Changelly), not a live pull from L2BEAT or a chain explorer, and both metrics move week to week.
This page does not resolve whether Base was at L2BEAT Stage 1 as of April 2025 (Changelly’s account) or Stage 0 as of April 2026 (Eco.com’s account). Both are stated above, dated and attributed to the outlet that reported them, because neither source in this evidence set is L2BEAT’s own page.
The claim that Coinbase applies OFAC-listed address restrictions to Base’s sequencer comes from Eco.com, which describes it as something Coinbase has stated publicly; this evidence set does not include that statement directly from Coinbase, so it is attributed to Eco.com’s reporting of it rather than to Coinbase as a primary source.
This page does not cover other Ethereum layer 2s, does not compare either chain to zero-knowledge rollups, and makes no claim about which chain is better to build on or hold funds on – that is a judgment for the reader, based on which trade-offs matter for a specific use.
Every fact above is attributed to one of these reports. Where they disagree, the article says so.
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