In plain English
What Blockchain bridge means
Blockchains do not normally share a single ledger, so an asset native to one chain cannot simply appear on another. A bridge creates a controlled process for recognizing a transfer across chains. The destination asset may be a wrapped version, a protocol-issued token, or assets supplied by liquidity providers, depending on the bridge’s design.
Why it matters
A bridge affects who or what verifies a transfer, how long it takes, the token received, and what happens if a transaction fails. Bridges are important infrastructure for moving assets between networks, including layer 1 and layer 2 systems, but they can introduce smart-contract, validator, custody, and liquidity risks.
Example
A user transfers 1 ETH from Ethereum Mainnet to another compatible network through a lock-and-mint bridge. The bridge locks the original ETH in its Ethereum contract and credits 1 bridge-recognized ETH representation on the destination network. Redeeming it normally reverses the process, subject to that bridge’s rules and fees.
Quick answers
Common questions
What is the difference between a trusted and trust-minimized bridge?+
A trusted bridge relies on an external operator, validator group, or custodian to authorize transfers. A trust-minimized design seeks verification through the connected chains’ own rules or cryptographic proofs. Neither label alone establishes a bridge’s overall security.
Can a bridge transfer smart-contract messages as well as tokens?+
Yes. Some bridges are designed only for asset movement, while generalized message-passing bridges can transmit instructions or data that a destination-chain smart contract can process. This added functionality can also increase design complexity and attack surface.
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