What Is a Blockchain Bridge?
A blockchain bridge is a protocol that connects two different blockchains, allowing tokens and information to move between them. Because blockchains are independent and often can't communicate directly, bridges make it possible to use an asset from one network on another — for example, moving tokens from Ethereum to a Layer 2 or to another Layer 1 like BNB Chain.
Bridges are a core piece of interoperability, helping connect an otherwise fragmented multi-chain ecosystem.
How Does a Bridge Work?
Most bridges use a lock-and-mint (or burn-and-mint) model:
You deposit tokens into the bridge on the source chain.
The bridge locks those tokens in a smart contract.
An equivalent amount of "wrapped" tokens is minted on the destination chain.
You use the wrapped tokens on the destination chain.
To move back, the wrapped tokens are burned and the original tokens are unlocked.
Why Are Bridges Useful?
| Benefit | Description |
|---|---|
| Access more apps | Use assets across many chains' DeFi ecosystems |
| Lower fees | Move funds to cheaper chains or Layer 2s |
| Liquidity | Bring liquidity to newer or smaller networks |
| Flexibility | Avoid being locked into a single blockchain |
Types of Bridges
Trusted (custodial) bridges — rely on a central operator to hold and release funds.
Trustless (decentralized) bridges — use smart contracts and code instead of a central party.
Wrapped-asset bridges — issue a wrapped version of an asset on the destination chain.
Bridge Security Risks
Bridges have historically been a major target for hackers, since they hold large amounts of locked value. Risks include smart contract vulnerabilities, compromised validators, and exploits of the lock-and-mint mechanism. Always use reputable, audited bridges and understand how a bridge secures funds before using it.
Bridges and Trust Wallet
Trust Wallet makes moving assets across chains simpler with built-in cross-chain functionality, so you can bridge and swap tokens between supported networks directly from the app. As a non-custodial wallet spanning 100+ blockchains, your assets stay under your control via your private keys throughout — letting you navigate a multi-chain world without handing custody to a third party.
