You send your USDC to the bridge contract. It locks your funds on L1 and mints equivalent USDC on Arbitrum. To return, you burn Arbitrum USDC and the bridge unlocks L1 funds.
Official: Arbitrum Bridge, Optimism Bridge (managed by project teams). Third-party: Stargate, Lido wstETH, Synapse (independent protocols). Official bridges are audited more frequently.
In 2023, bridges lost $2 billion to exploits (Poly Network, Ronin, Nomad). A successful attack could trap your funds mid-bridge. Major bridges now have insurance from Nexus Mutual or Cover Protocol.
If Arbitrum fails or forks, wrapped USDC on Arbitrum might become worthless. The risk is small for established rollups but real for new chains. Start with tested bridges (Arbitrum, Optimism, Polygon).
Use official bridges when available. Keep bridge transfers under $50,000. Don't bridge rare or illiquid assets. Test with small amounts first ($100). Check bridge TVL; higher TVL = more security scrutiny.
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