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The Amended Constitution of the Arbitrum DAO

This document lays out the Amended Constitution of the ArbitrumDAO. The original Constitution of the ArbitrumDAO took effect on the date upon which AIP-1 was posted, located at

Some of the rules and procedures of this Constitution will be enforced directly by smart contracts on a blockchain, and some will not. All rules are equally binding. Actions taken under this Constitution may be on-chain or off-chain actions. On-chain actions are those that are actuated directly by the governance smart contracts of the DAO as transactions on a blockchain. Off-chain actions are those that are actuated by other means.

This Constitution also includes some "recommended guidelines" which are non-binding but strongly recommended as good governance practice.

This Constitution describes the procedures by which it may be amended and lays out the governance framework of the ArbitrumDAO and The Arbitrum Foundation.


  • AIP: An Arbitrum Improvement Proposal
  • ArbitrumDAO-governed chains: The Arbitrum One and Arbitrum Nova chains and any additional chains authorized by the ArbitrumDAO
  • DAO Treasury: All $ARB tokens held in a governance smart contract governed directly by the ArbitrumDAO and/or the Security Council of The Arbitrum Foundation via on-chain voting mechanisms.
  • Governed Chains: Any ArbitrumDAO-approved chains that are governed by the $ARB token
  • Non-Governed Chains: Any ArbitrumDAO-approved chains that are not governed by the $ARB token
  • Votable Tokens: All $ARB tokens in existence, excluding any tokens held by The Arbitrum Foundation and any unclaimed airdrops

Section 1: Chain "ownership"

This Constitution describes the decision-making framework for the ArbitrumDAO governance and/or authorization of the ArbitrumDAO-approved chains. The DAO may authorize the creation of additional Layer-2 chains that settle to Ethereum using the Arbitrum technology, but each such additional Layer-2 chain must be authorized by a corresponding AIP (i.e., no more than one chain may be authorized in each AIP). Any chain that is so authorized may be governed by the $ARB token and this Constitution, in which case, such chain would be deemed a Governed Chain. Any chain that is authorized but not governed by the $ARB token will be deemed a Non-Governed Chain. For the avoidance of doubt, any ArbitrumDAO-approved chain (whether a Governed Chain or a Non-Governed Chain) must settle to or on Ethereum. Chains utilizing Arbitrum technology that settle to or on ArbitrumDAO-approved chains (i.e., as “layer 3s”) do not require ArbitrumDAO authorization.

The Arbitrum protocol allows each chain to have one or more "chain owners" who have the power to take administrative actions that change a chain's core protocol and code and/or alter any of its core parameters. The "chain owner" will also have the power to upgrade certain associated Layer 1 contracts. The "chain owner" will control affordances on the chain such as updating the contract implementation of any of Arbitrum's core protocol Transparent Upgradeable Proxy contracts, and adjusting system parameters via, e.g., setter methods in the ArbOwner precompile.

With the $ARB token generation event and subsequent creation of the ArbitrumDAO having occurred, "owner" privileges on both the Arbitrum One and Arbitrum Nova chains have been given to both the ArbitrumDAO and the Security Council of The Arbitrum Foundation.

Section 2: DAO Proposals and Voting Procedures

The following process governs the rules and procedures by which the ArbitrumDAO may propose, vote on and implement Arbitrum Improvement Proposals (AIPs). No AIP may be in violation of applicable laws, in particular sanctions-related regulations.

  1. Phase 1: Temperature Check (1 week) (Optional but Recommended): The AIP is suggested on the public forum and discussed/debated for 1 week. The AIP should be accompanied by a Snapshot poll or other method as determined pursuant to the governance process, which can only be submitted by an address that can vote at least 0.01% of the Votable Tokens. The Snapshot poll also runs for 1 week, and is decided by a simple majority with no required participation threshold. An AIP that fails the temperature check should not be submitted for a vote. If an AIP fails the temperature check, or has not undergone a temperature check, as a matter of good governance practice, it is recommended that voters strongly consider voting to reject it.
  2. Phase 2: Formal AIP and call for voting (3 days): The AIP is submitted via governance contracts on Arbitrum One, with a user interface available on Tally. The AIP proposer is required to have an address that is delegated at least 1,000,000 Votable Tokens.

    After 3 days, a voter distribution snapshot will be taken and the voting period will begin; this gives interested parties time to discuss the AIP and gather votes before the voter distribution snapshot is taken.

    Each AIP must be labeled as Constitutional or non-Constitutional.

    A Constitutional AIP is one that:

    • Process: Modifies the text or procedures of this Constitution and, so long as The Arbitrum Foundation exists, the Amended & Restated Memorandum and Articles of Association and the Amended & Restated Bylaws of The Arbitrum Foundation
    • Software update: Installs or modifies software on any chain
    • Core: Takes any action that requires "chain owner" permission on any chain
    • New Chain Approval: Authorizes a new chain as approved by the ArbitrumDAO. This includes authorizing both Governed Chains and Non-Governed Chains

    Recommended guideline: DAO members should vote against any AIP that is incorrectly labeled.

    A Non-Constitutional AIP is one that is not considered a "Constitutional AIP" including:

    • Funding: Requests funds/grants or otherwise propose how to spend or allocate funds from the DAO Treasury and, so long as The Arbitrum Foundation exists, the Administrative Budget Wallet as defined in the The Arbitrum Foundation’s Amended & Restated Bylaws
    • Informational: Provides general guidelines or information to the community but does not otherwise propose a new feature or update

    Each AIP must also clearly specify which Governed Chain(s) it will affect (this may be specified by code, data, or text, as appropriate for the specific AIP).

    As a recommended guideline, an AIP should include:

    • Abstract - Two or three sentences that summarize the AIP.
    • Motivation - A statement on why the Arbitrum community should implement the AIP.
    • Rationale - An explanation of how the AIP aligns with the Arbitrum community's mission and guiding values.
    • Key Terms (optional) - Definitions of any terms within the proposal that are unique to the proposal, new to the Arbitrum community, and/or industry-specific.
    • Specifications - A detailed breakdown of the platforms and technologies that will be used.
    • Steps to Implement - The steps to implement the AIP, including associated costs, manpower, and other resources for each step where applicable. For the avoidance of doubt, any AIPs involving transactions with third parties (such as grants) will need to ensure that applicable legal documentation and procedures are also included.
    • Timeline - Relevant timing details, including but not limited to start date, milestones, and completion dates.
    • Overall Cost - The total cost to implement the AIP.

    As a recommended guideline, the AIP author can add additional fields to any template if necessary to fully communicate the intentions, specifics and implications of the AIP.

    As a recommended guideline, resubmitted AIPs should also include:

    • A link to the original AIP;
    • Reasons such original AIP was not approved;
    • Changes that have been made and why it should now be approved; and
    • Any additional fields to any template if necessary to fully communicate the changes made and the intentions, specifics and implications of such resubmitted AIP.
  3. Phase 3: DAO votes on AIP, on Arbitrum One (14-16 days): During this Phase 3, the ArbitrumDAO will be able to vote directly on-chain on a submitted AIP.

    An AIP passes if the following 2 conditions are met:

    1. More Votable Tokens have casted votes "in favor" than have casted votes "against" ("Threshold 1"); and
    2. In the case of a:
      • Constitutional AIP, at least 5% of all Votable Tokens have casted votes either "in favor" or "abstain"; or
      • Non-Constitutional AIP, at least 3% of all Votable Tokens have casted votes either "in favor" or "abstain" (collectively, "Threshold 2").

    The voting period ends 14 days after the start of voting. However, if Threshold 2 was reached within the last 2 days of the 14-day voting period, the voting period will be extended to end 2 days after Threshold 2 was reached.

    If the AIP fails to pass, the process ends after this Phase 3.

    If the AIP passes, then:

    • If it is a Constitutional AIP, Phases 4 through 7 below are carried out.
    • If it is a Non-Constitutional AIP, Phase 4 is carried out, and then Phases 5 and 6 are bypassed, after which the AIP enters Phase 7 immediately.
  4. Phase 4: L2 Waiting Period (3 days): After an AIP has passed Phase 3, a 3 day waiting period occurs. This gives users who object to the AIP time to initiate withdrawal of their funds or take other action on L2.

  5. Phase 5: Initiate and Finalize an L2-to-L1 Message (at least 1 challenge period of the rollup protocol): After the 3 day waiting period in Phase 4 has passed, an L2-to-L1 message is sent indicating that the AIP was passed. When this message is finalized on L1, anyone can redeem it to complete this step and initiate the next step. This step ensures that the completion of the L2 waiting period will be recognized on L1 after any withdrawals initiated during or soon after the voting period have been recognized on L1.

  6. Phase 6: L1 Waiting Period (3 days): Following the completion of Phase 5, there will be an additional 3 day waiting period. This ensures that users who initiated withdrawals or other L2-to-L1 messages have time to execute them on L1 before the AIP takes effect.

  7. Phase 7: Implementation: The AIP is fully executed and implemented. This may happen on L1 or via a transaction sent from L1 to one or more Governed Chains.

This AIP process as specified will typically require 37 days from the beginning of the temperature check in Phase 1 until an AIP is finally executed in Phase 7 for a Constitutional AIP, or 27 days for a Non-Constitutional AIP. An AIP may optionally specify further delay before its implementation.

Section 3: The Security Council

The Security Council is a committee of 12 members who are signers of a multi-sig wallet, which has powers to perform certain Emergency Actions and Non-Emergency Actions, as delegated to it by the ArbitrumDAO and The Arbitrum Foundation, and is responsible for upholding this ArbitrumDAO Constitution. Through the submission, approval and implementation of a Constitutional AIP, the ArbitrumDAO is able to modify the Security Council's powers or to eliminate the Security Council entirely.

Equivalent "copies" of the Security Council multi-sig contracts exist, one on Ethereum and another on each ArbitrumDAO-governed chain.

Emergency Actions:

The Security Council has the power to execute any software upgrade or perform other required actions with no delay in order to respond to a security emergency, should one arise (such actions, "Emergency Actions"). Performing any Emergency Action requires a 9-of-12 approval from the Security Council. The Security Council must not use its power to perform Emergency Actions except in a true security emergency, such as a critical vulnerability that could significantly compromise the integrity, confidentiality, or availability of a chain governed by the ArbitrumDAO.

After performing any Emergency Action, the Security Council must issue a full transparency report (at an appropriate time after the security emergency has passed) to explain what was done and why such Emergency Action was justified.

The ArbitrumDAO is able to curtail or eliminate the Security Council's power to perform Emergency Actions via approval and implementation of a Constitutional AIP.

Non-Emergency Actions:

The Security Council may also approve and implement routine software upgrades, routine maintenance and other parameter adjustments in a non-emergency setting (such actions, "Non-Emergency Actions"), which require a 9-of-12 approval in order to take effect. Any Non-Emergency Action, after approval by the Security Council, will bypass Phases 1 to 3 of the AIP process and instead directly go through Phases 4 to 7 of the AIP process, to provide a delay before any Non-Emergency Action is deployed. The Security Council may optionally specify additional delays before deployment.

The ArbitrumDAO is able to curtail or eliminate the Security Council's power to perform Non-Emergency Actions via approval and implementation of a Constitutional AIP.

Section 4: Security Council Elections

The Security Council has 12 members, who are divided into two Cohorts of 6 members.

The initial Security Council Cohorts were determined by randomly splitting the 12 members into two 6-member cohorts - 6 members in the ‘First Cohort’ and 6 members in the ‘Second Cohort’. The members of the initial Security Council Cohorts are detailed in a transparency report here.

The first Security Council election is scheduled to begin on the 15th September 2023 or the earliest possible date. The election can only begin upon the availability of an on-chain election process that is approved and installed by the Arbitrum DAO. This first election replaces the 'First Cohort'. The next election replaces the 'Second Cohort' and so forth.

The date chosen for the first election will form the basis for all future elections. Every election should begin 6 months after the previous election has started and it will replace its respective cohort of 6 members.

All Security Council members are expected to serve their term until the election is complete and the new Security Council members are installed.

The following timeline governs an election that starts at time T:

  1. Contender submission (T until T+7 days): Any DAO member may declare their candidacy for the Security Council, provided that a current Security Council member in one cohort may not be a candidate for a seat in the other cohort.
  2. Nominee selection (T+7 until T+14 days): Each DAO member or delegate may vote for their declared contender. Each token may be cast for one contender. To the extent that there are more than six contenders, each eligible contender must be supported by pledged votes representing at least 0.2% of all Votable Tokens.
  3. Compliance process (T+14 until T+28 days): All candidates will cooperate with the Arbitrum Foundation and complete the compliance process. The Arbitrum Foundation is responsible for removing any candidates that fail the compliance process. In the event that fewer than six candidates are supported by pledged votes representing at least 0.2% of all Votable Tokens, the current Security Council members whose seats are up for election may become candidates (as randomly selected out of their Cohort) until there are 6 candidates.
  4. Member election (T+28 until T+49 days): Each DAO member or delegate may vote for any declared candidate. Each token may be cast for one candidate. Votes cast before T+35 days will have 100% weight. Votes cast between T+35 days and T+49 days will have weight based on the time of casting, decreasing linearly with time, with 100% weight at T+35 days, decreasing linearly to 0% weight at T+49 days.
  5. At T+49 days: The process for replacing the cohort of security council members with the 6 candidates who received the most votes will be activated. The installation process must be executed via the on-chain governance smart contracts and it may take several days until the new security council members are installed.

The Arbitrum Foundation is allocated 14 days for the Compliance process and it should be executed between the Nominee selection and Member election. The Arbitrum Foundation has flexibility to update its compliance policy for every new election. This is required to allow The Arbitrum Foundation to comply with Cayman Island laws. Furthermore, The Arbitrum Foundation maintains the right to issue new procedures and guidelines for off-chain components of the Security Council election. All efforts should be made by The Arbitrum Foundation to ensure an orderly, fair, and transparent election.

As a matter of best practice for maintaining an independent Security Council, no single organization should be overly represented in the Security Council. In particular, there should not be more than 3 candidates associated with a single entity or group of entities being elected to the Security Council, thereby ensuring that there will be no single entity or group of entities able to control or even veto a Security Council vote.

Furthermore, no candidate with conflicts of interest that would prevent them from acting in the best interests of the ArbitrumDAO, Governed Chains and/or The Arbitrum Foundation should be elected to the Security Council. Potential conflicts of interest could be, but are not limited to, affiliations with direct Arbitrum competitors, proven histories of exploiting projects and others.

The DAO may approve and implement a Constitutional AIP to change the rules governing future Security Council elections, but the AIP process may not be used to intervene in an ongoing election.

Security Council members may only be removed prior to the end of their terms under two conditions:

  1. At least 10% of all Votable Tokens have casted votes either "in favor" of removal or "abstain", and at least 5/6 (83.33%) of all casted votes are "in favor" of removal; or
  2. At least 9 of the Security Council members vote in favor of removal.

The seats of Security Council members who have been removed prior to the end of their respective terms shall remain unfilled until the next election that such seats are up for appointment, unless otherwise replaced prior to such next election by a vote of at least 9 of the Security Council members, in which case such seat shall be up for appointment at the next such election. The Security Council may not re-appoint a removed member and they can only be re-elected via the election voting system.

Section 5: Data Availability Committee

Transactions occurring on the Arbitrum Nova chain are settled on Ethereum mainnet, but, unlike transactions occurring on the Arbitrum One chain, the underlying transaction data batches are posted and stored by the members of the Data Availability Committee on a Data Availability Server (and not on Ethereum mainnet).

The members of the Data Availability Committee of the Nova chain are available in a transparency report here.

Data Availability Committee members can be appointed and removed at any time pursuant to a Constitutional AIP approved by the ArbitrumDAO. In the event that a Data Availability Committee member is removed (and not otherwise replaced) pursuant to a Constitutional AIP approved by the ArbitrumDAO, or in the event that a Data Availability Committee member resigns without a replacement, the Security Council may execute an emergency action (9-of-12 approval required) to appoint a replacement for such removed or resigned Data Availability Committee member.

Section 6: Community Values

As the guiding values of the ArbitrumDAO and The Arbitrum Foundation, Governed Chains, technology, and community should be:

  • Ethereum-aligned: Arbitrum is part of the Ethereum ecosystem, and the Arbitrum community is part of the Ethereum community. Although the ArbitrumDAO makes its own decisions and pursues its own goals, it is deeply aligned with Ethereum and sees itself as an active and constructive participant in the Ethereum community.
  • Sustainable: Arbitrum should be built and operated with an eye to the medium to long term. Decisions about technology, economics, and resource allocation should not value short-term optimization over the longer-term health and thriving of the Arbitrum protocol, technology and community.
  • Secure: Arbitrum is security minded, and safety of the system should be weighed heavily when considering any protocol changes. In particular, Arbitrum One is a proper L2 rollup chain, and as such, derives its security from Ethereum; any changes made to Arbitrum One should preserve this property.
  • Socially inclusive: The community should be open and welcoming to all people who wish to participate constructively. Differences in knowledge, resources, geography, language, and life experience should be seen as opportunities to learn and to grow the community.
  • Technically inclusive: It should remain possible for ordinary people, with ordinary computer systems, to participate as fully as possible in the Arbitrum protocol if they wish to do so.
  • User-focused: The Arbitrum ecosystem should be managed for the benefit of all Arbitrum users.
  • Neutral and open: Arbitrum governance should not pick winners and losers, but should foster open innovation, interoperation, user choice, and healthy competition on Arbitrum chains.

Constitution hash


To compute this hash yourself, you can clone ArbitrumFoundation/docs to your local machine and run yarn update-constitution-hash from the root directory of the repo. Alternatively, you can install Node.js, navigate to the docs folder, and run node ./scripts/updateConstitutionHash.js.

This will use the keccak256 method from the @ethersproject/solidity project to compute the hash of the Constitution's markdown source code, located in /ArbitrumFoundation/docs/blob/main/docs/partials/