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Optimism

Optimism is a project dedicated to scaling Ethereum's technology and expanding its ability to coordinate people from across the world to build effective decentralized economies and governance systems.

ETH
Optimism
Defi
NFT
L1
L2
C/C++
Go
Solidity
Maximum Bounty
$2,000,042
Live Since
14 January 2022
Last Updated
23 July 2025
  • Triaged by Immunefi

  • PoC Required

  • KYC required

Rewards

Optimism provides rewards in USDC on Ethereum, denominated in USD.

Rewards by Threat Level

Blockchain/DLT
Critical
Up to: $2,000,042
Primacy of Impact
High
Flat: $50,000
Primacy of Impact
Medium
Flat: $15,000
Primacy of Impact
Smart Contract
Critical
Up to: $2,000,042
Primacy of Impact
High
Flat: $50,000
Primacy of Impact
Medium
Flat: $15,000
Primacy of Impact
Critical Reward Calculation

Mainnet assets:

Reward amount is 10% of the funds directly affected up to a maximum of:

$2,000,042

Rewards are distributed according to the impact of the vulnerability based on the Immunefi Vulnerability Severity Classification System. This is a simplified 5-level scale, with separate scales for websites/apps and smart contracts/blockchains, encompassing everything from consequence of exploitation to privilege required to likelihood of a successful exploit.

Since Optimism uses a fork of Geth, issues which are responsibly disclosed to upstream cannot be "replayed" against Optimism’s bug bounty program if the vulnerability has already been made public. If the vulnerability is disclosed to Optimism at the same time as upstream Geth, the vulnerability is eligible for the bug bounty program.

All reports must come with a PoC in order to be considered for a reward.

For KYC, OptimismPBC will request a W-9 if you reside in the US or a W-8 if you reside outside the US.

Critical vulnerabilities are further capped at 10% of economic damage, with the main consideration being the funds affected in addition to PR and brand considerations, at the discretion of the team. However, there is a minimum of USD 75 000 for Critical bug reports.

For testing any exploits involving cross-domain transactions, we recommend working with our dockerized services and modifying our integration tests

Governance Proposals:

In addition to the above assets listed, the calldata and code for the latest Protocol Upgrade Proposals (not for Governor Upgrade proposals, or proposal previews) is also in scope. This must be an official governance proposal, meaning it has either (1) moved to onchain vote appearing on vote.optimism.io, or (2) has been posted by someone from OP Labs or the Optimism Foundation, or (3) a comment has been left by someone from OP Labs or the Optimism Foundation indicating it's eligible for the bounty. The latest in-flight governance proposal can be found at https://gov.optimism.io/c/technical-proposals/protocol-upgrade/.

Program Overview

Optimism is a project dedicated to scaling Ethereum's technology and expanding its ability to coordinate people from across the world to build effective decentralized economies and governance systems.

The OP Stack is the modular, decentralized software stack that powers Optimism, forms the backbone of blockchains like OP Mainnet and Base, and is maintained by the Optimism Collective .

The first release of the OP Stack codebase is called Bedrock. The Bedrock release primarily consists of the core software required to run L2 blockchains and was originally designed to power an upgrade to the OP Mainnet network. Bedrock improves on its predecessor by reducing transaction fees using optimized batch compression and Ethereum as a data availability layer; shortening delays of including L1 transactions in rollups by handling L1 re-orgs more gracefully; enabling modular proof systems through code re-use; and improving node performance by removing technical debt.

To read more about Optimism, please visit https://www.optimism.io/. To learn about the OP Stack, please visit https://stack.optimism.io/.

This bounty program is focused on preventing

  • Theft of assets held in their smart contracts;
  • Theft, freezing or other loss of funds due to vulnerabilities in the smart contracts’ or the critical blockchain client services (op-node and op-geth).

Primacy of Impact vs Primacy of Rules

Optimism adheres to the Primacy of Impact for the following impacts:

  • Smart Contract — Critical
  • Smart Contract — High
  • Smart Contract — Medium
  • Blockchain/DLT — Critical
  • Blockchain/DLT — High
  • Blockchain/DLT — Medium

Primacy of Impact means that the impact is prioritized rather than a specific asset. This encourages security researchers to report on all bugs with an in-scope impact, even if the affected assets are not in scope.

For more information, please see Best Practices: Primacy of Impact

When submitting a report on Immunefi’s dashboard, the security researcher should select the Primacy of Impact asset placeholder. If the team behind this project has multiple programs, those other programs are not covered under Primacy of Impact for this program. Instead, check if those other projects have a bug bounty program on Immunefi.

If the project has any testnet and/or mock files, those will not be covered under Primacy of Impact.

All other impacts are considered under the Primacy of Rules, which means that they are bound by the terms and conditions set within this program.

Known Issues

Category
Smart Contract
Description / Link
Known issues Smart Contracts (Optimism)
Last Updated At
12 June 2025
Category
Blockchain/DLT
Description / Link
Known issues Blockchain / DLT (Optimism)
Last Updated At
12 June 2025

KYC required

The submission of KYC information is a requirement for payout processing.

Proof of Concept

Proof of concept is always required for all severities.

Responsible Publication

Category 3: Approval Required

Prohibited Activities

Default prohibited activities
  • Any testing on mainnet or public testnet deployed code; all testing should be done on local-forks of either public testnet or mainnet
  • Any testing with pricing oracles or third-party smart contracts
  • Attempting phishing or other social engineering attacks against our employees and/or customers
  • Any testing with third-party systems and applications (e.g. browser extensions) as well as websites (e.g. SSO providers, advertising networks)
  • Any denial of service attacks that are executed against project assets
  • Automated testing of services that generates significant amounts of traffic
  • Public disclosure of an unpatched vulnerability in an embargoed bounty
  • Any other actions prohibited by the Immunefi Rules

Feasibility Limitations

The project may be receiving reports that are valid (the bug and attack vector are real) and cite assets and impacts that are in scope, but there may be obstacles or barriers to executing the attack in the real world. In other words, there is a question about how feasible the attack really is. Conversely, there may also be mitigation measures that projects can take to prevent the impact of the bug, which are not feasible or would require unconventional action and hence, should not be used as reasons for downgrading a bug's severity.

Therefore, Immunefi has developed a set of feasibility limitation standards which by default states what security researchers, as well as projects, can or cannot cite when reviewing a bug report.

Total paid

2.6M

Med. Resolution Time
2 days
Total Assets in Scope
23