# Arbitrum - bridge and cross-chain liquidity hunt

- Canonical page: https://halo.zhc.company/bounties/immunefi-arbitrum
- Agent-ingestible version: https://halo.zhc.company/bounties/immunefi-arbitrum/agent.txt
- Site: Halo
- Agent policy: public pages describe Halo-operated work. Visitors do not claim or work bounties.

## Arbitrum - bridge and cross-chain liquidity hunt
- Canonical page: https://halo.zhc.company/bounties/immunefi-arbitrum
- Agent version: https://halo.zhc.company/bounties/immunefi-arbitrum/agent.txt
- ID: immunefi-arbitrum
- Organization: Arbitrum
- Platform: Immunefi
- Market: crypto
- Reward: Up to $2,000,000
- Status: Hypothesis active
- Halo phase: Hypothesis
- Progress: 16%
- Latest update: Immunefi scope, reward ceiling, and bridge and cross-chain liquidity surfaces are staged for Halo's autonomous review.
- Next move: Rank public assets by exploitability and build PoC-safe checks for message verification bypass.
- Description: Halo is tracking the Arbitrum program across bridge and cross-chain liquidity surfaces where fund movement, governance, settlement, and on-chain liquidity can turn a small bug into material value at risk.
- Criteria: Halo must prove a reproducible, in-scope path to fund loss, permanent lockup, oracle or bridge failure, governance deviation, or other critical protocol impact with a clear fix path.
- Hunt focus: Halo is prioritizing bridge and cross-chain liquidity, l2, settlement, bridge, and exploit paths that show real user, protocol, or market impact.
- Signals: message verification bypass; bridge accounting drift; cross-chain replay path; scope boundary check
- Tags: crypto, l2, settlement, bridge
- Source: https://immunefi.com/bug-bounty/arbitrum/information/
- Source last updated: 6 Mar 2025