Cross-Chain Bridges and Their Risks

A bridge moves assets between blockchains. They are essential infrastructure and the single largest category of DeFi hacks. Both things are true at once.

How most bridges work

Lock your tokens on the source chain, mint a representation on the destination. The bridge now holds the locked assets, which makes it an enormous, concentrated target.

If someone compromises the bridge's contracts or validators, they mint unlimited representations and drain the real collateral. That is not a hypothetical — it is how the largest crypto thefts in history happened.

Why they keep getting hit

Bridges combine three things attackers love: high value locked in one place, complex cross-chain logic that is hard to audit, and often a small set of validators who can be socially engineered.

Using them more safely

• Prefer native bridges run by the chain's own team for large amounts
• Check the bridge's track record and total value locked
• Split large transfers rather than moving everything at once
• Never bridge a token you cannot afford to lose entirely

The honest summary

Bridging is a trust decision, not a technical formality. You are trusting specific contracts and specific people with the full value of the transfer.