principlejavascriptCritical
Cross-chain bridges: risks and safe patterns for asset bridging
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cross-chain bridgeRonin hackCCIPLayerZerocanonical bridgebridge security
Problem
Cross-chain bridges are the most attacked infrastructure in DeFi. Billions have been lost to bridge exploits (Ronin, Wormhole, Nomad).
Solution
Prefer canonical bridges (Optimism Bridge, Arbitrum Bridge) for moving assets to their respective L2s. For general messaging use Chainlink CCIP or LayerZero. Always verify message proofs and implement rate limiting.
// Use canonical bridge events for verification
IL1StandardBridge.depositERC20(l1Token, l2Token, amount, l2Gas, data);Why
Bridge contracts hold large amounts of assets and must validate proofs from external chains. Bugs in proof validation, multi-sig compromise, or logic errors have led to catastrophic losses.
Gotchas
- Never bridge large amounts in a single transaction — use batched smaller transfers to limit exposure
- Wrapped assets on bridges are only as safe as the bridge itself — check the bridge's security model
- Always have a withdrawal path — confirm your destination chain supports unwrapping back to native assets
Context
Integrating cross-chain functionality or advising users on moving assets between chains
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