Nomad is a security-first cross-chain messaging protocol that enables seamless communication between blockchains. By leveraging an optimistic mechanism, Nomad only requires one honest actor to keep the entire system safe. This drastically reduces the trust required relative to other interoperability solutions.
Nomad enables generalized messaging passing between chains, so developers can build cross-chain applications (or xApps) that compose logic and smart contract calls between chains, natively.
For more information about Nomad, please visit https://www.nomad.xyz/.
Rewards by Threat Level
Rewards are distributed according to the impact of the vulnerability based on the Immunefi Vulnerability Severity Classification System V2.1. This is a simplified 5-level scale, with separate scales for websites/apps, smart contracts, and blockchains/DLTs, focusing on the impact of the vulnerability reported.
All bug reports must come with a PoC with an end-effect impacting an asset-in-scope in order to be considered for a reward. Explanations and statements are not accepted as PoC and code is required.
Rewards for critical smart contract 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 reward of USD 100 000 for Critical smart contract bug reports.
Nomad requires KYC to be done for all bug bounty hunters submitting a report and wanting a reward. The information needed is a Full Name, Mailing Address, Email, and Photo Identification.
The following issues are considered out of scope of this program:
- Reports that require the Updater to commit Fraud
- Reports related to Updater bonding, slashing, or rotation (which is not yet spec’d)
- Reports stemming from code that is deployed on-chain but edited / removed in the monorepo before the bug report is submitted
- Reports stemming from line items in publicly available audit reports here: https://github.com/nomad-xyz/docs/blob/1ff0c55dba2a842c811468c57793ff9a6542ef0f/docs/public/Nomad-Audit.pdf
Payouts are handled by the Nomad team directly and are denominated in USD. However, payouts are done in USDC.
Bounty hunters must pass OFAC Screening. Rewards cannot be paid out if hunters are on the OFAC SDN list.
- Up to USD $1,000,000
- USD $100,000
Assets in scope
- Smart Contract - BridgeRouter - ImplementationType
- Smart Contract - TokenRegistry - ImplementationType
- Smart Contract - BridgeToken - ImplementationType
- Smart Contract - Governance Router - ImplementationType
- Smart Contract - Home - ImplementationType
- Smart Contract - Replica - ImplementationType
- Smart Contract - EthHelperType
- Smart Contract - xAppConnectionManagerType
- Smart Contract - Updater ManagerType
- Smart Contract - BridgeRouter - ProxyType
- Smart Contract - TokenRegistry - ProxyType
- Smart Contract - BridgeToken - ProxyType
- Smart Contract - Governance Router - ProxyType
- Smart Contract - Home - ProxyType
- Smart Contract - Xdai Replica - ProxyType
- Smart Contract - Evmos Replica - ProxyType
- Smart Contract - MilkomedaC1 Replica - ProxyType
- Smart Contract - Avalanche Replica - ProxyType
- Smart Contract - Moonbeam Replica - ProxyType
- Smart Contract - BridgeRouter - BeaconType
- Smart Contract - TokenRegistry - BeaconType
- Smart Contract - BridgeToken - BeaconType
- Smart Contract - Governance Router - BeaconType
- Smart Contract - Home - BeaconType
- Smart Contract - Replica - BeaconType
All smart contracts of Nomad can be found at https://github.com/nomad-xyz/monorepo/. However, only those in the Assets in Scope table are considered as in-scope of the bug bounty program.
Impacts in scope
Only the following impacts are accepted within this bug bounty program. All other impacts are not considered as in-scope, even if they affect something in the assets in scope table.
- Any governance voting result manipulationCriticalImpact
- Direct theft of any user funds, whether at-rest or in-motion, other than unclaimed yieldCriticalImpact
- Permanent freezing of fundsCriticalImpact
- Protocol InsolvencyCriticalImpact
- Temporary freezing of funds for at least 48 hoursHighImpact
Out of Scope & Rules
The following vulnerabilities are excluded from the rewards for this bug bounty program:
- Attacks that the reporter has already exploited themselves, leading to damage
- Attacks requiring access to leaked keys/credentials
- Attacks requiring access to privileged addresses (including Updater, Watcher, Governance multisig, Recovery Manager multisig)
Smart Contracts and Blockchain
- Incorrect data supplied by third party oracles
- Not to exclude oracle manipulation/flash loan attacks
- Basic economic governance attacks (e.g. 51% attack)
- Lack of liquidity
- Best practice critiques
- Sybil attacks
- Centralization risks
The following activities are prohibited by this bug bounty program:
- Any testing with mainnet or public testnet contracts; all testing should be done on private testnets
- 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
- Automated testing of services that generates significant amounts of traffic
- Public disclosure of an unpatched vulnerability in an embargoed bounty