// GLOSSARY -- WEB3 INFRASTRUCTURE

What is Bridge?

1 min read Updated

A blockchain bridge is a protocol enabling asset and data transfer between different blockchain networks — locking assets on one chain and minting equivalent representations on another.

WHY IT MATTERS

Bridges connect isolated blockchains. They enable: moving ETH from Ethereum to Arbitrum, transferring USDC from Ethereum to Solana, and sending messages between any connected chains.

Bridge architectures vary in trust models: canonical bridges (L1↔L2, highest security), multisig bridges (validator committee, moderate security), and trustless bridges (light client verification, highest security but most complex).

Bridge security is critical and historically weak — bridge hacks represent billions in losses. The fundamental challenge: verifying state across chains is hard, and bridges concentrate enormous value in their contracts.

FREQUENTLY ASKED QUESTIONS

What's the safest bridge type?
Canonical L1↔L2 bridges (Ethereum → Arbitrum/Base/Optimism) have the strongest security guarantees. For cross-chain, Chainlink CCIP and well-established bridges are preferred.
Why are bridge hacks so large?
Bridges hold the locked assets backing wrapped tokens on the destination chain. Compromising the bridge contract gives access to all locked assets — often hundreds of millions.
Will we always need bridges?
Likely yes, unless a single chain dominates. Interoperability standards (CCIP, LayerZero) aim to make bridging safer and more seamless, but the fundamental cross-chain challenge persists.

FURTHER READING

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