DefineDeFiWeb3 Glossary

Bridge (Blockchain)

A tool that lets you move crypto between different blockchains. Like a currency exchange, but for different blockchain networks.

Example

Using the Polygon Bridge to move ETH from Ethereum to Polygon, where transactions are much cheaper.

Related Terms

Tools & Protocols
Blockchain Bridge ArchitectureShows how tokens are locked on the source chain and minted on the destination chainEthereumSource ChainLock ContractEEEBridgeValidators✓✓✓PolygonDestination ChainMint ContractWWWLockVerifyMintYouSend 1 ETH, receive 1 WETH on PolygonYou

⚙️How It Works

  1. 1

    Lock on Source

    Your tokens are locked in a smart contract on the original blockchain

  2. 2

    Verification

    Bridge validators or proofs confirm the lock transaction occurred

  3. 3

    Mint on Destination

    Equivalent 'wrapped' tokens are created on the destination chain

  4. 4

    Use Freely

    You can use the wrapped tokens on the new chain

  5. 5

    Return (Optional)

    Burn wrapped tokens to unlock originals when bridging back

⚠️Risks & Warnings

  • •Bridge hacks have caused billions in losses - bridges are high-value targets
  • •Some bridges are centralized, meaning a small group controls your funds
  • •Wrapped tokens may lose their peg if the bridge is compromised
  • •Long withdrawal times on some bridges (up to 7 days for optimistic bridges)

🚀Getting Started

  • 1Choose a reputable bridge - check audit status and TVL
  • 2Start with a small test transaction to verify it works
  • 3Make sure you have native tokens on the destination for gas fees
  • 4Bookmark official bridge URLs to avoid phishing sites
  • 5Compare bridge fees and speeds using aggregators like Bungee or LI.FI
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