> For the complete documentation index, see [llms.txt](https://docs.guardrail.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.guardrail.ai/use-cases/bridges.md).

# Bridges & Cross-Chain

Bridges are high-value targets—over 50% of DeFi losses come from bridge exploits. Cross-chain verification requires specialized monitoring.

## Key Risks

* **Message validation failures** between source and destination chains
* **Mint/burn mismatches** creating unbacked tokens
* **Relay manipulation** submitting fraudulent cross-chain messages
* **Upgrade vulnerabilities** in bridge contracts

## Guards We Deploy

**Cross-Chain Message Matching** — Verify bridged amounts match between source and destination.

**Mint/Burn Limits** — Alert when token minting exceeds expected thresholds.

**Bridge Relay Monitoring** — Track relay operations and flag anomalies.

**Upgrade Event Guards** — Monitor proxy upgrades and initialization calls.

## Case Study: Concero

> "No one can tell me anything that will convince me not to use Guardrail." — Andy Bohutsky, Founder

1-day implementation with real-time cross-chain message validation.

[Read full case study →](https://www.guardrail.ai/case-studies/concero)

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