Blockchains are deliberately isolated. One ledger has no way of knowing what happened on another, and it will not accept the other's transactions as valid. A bridge sits in the gap and creates the <em>appearance</em> of movement. The most common design locks your asset in a contract or a custodial account on the source chain, then mints a matching claim token on the destination chain. Send that claim back and it is burned, releasing the original.
Other designs skip minting and keep pools of the same asset on both sides, paying you out of the destination pool while your deposit tops up the source pool. Either way, what lands in your wallet is often not the original coin but a wrapped <a href="/glossary/token/">token</a> whose value rests entirely on somebody credibly holding the backing. Bridges are what make <a href="/glossary/layer-2/">layer-2</a> networks usable and multi-chain trading practical, so the demand for them is real.
That backing is also the weak point, and it should be said plainly: bridges have been drained by attackers again and again. A bridge concentrates a large pool of assets behind a modest amount of code and, frequently, a small set of signing keys, while having to judge whether messages from a foreign chain are genuine. The failures tend to be total rather than partial. When the reserves go, the wrapped tokens on the far side are backed by nothing, and holders are left with a receipt for an asset that no longer exists.
Practical habits help. Reach a bridge through a link you already trust rather than a search result or a message, because fake bridge front-ends are a standard phishing trick covered in our <a href="/toolkit/how-to-spot-crypto-scams/">scam-spotting guide</a>. Treat every minute your funds sit in transit as exposure, not as plumbing, and do not park long-term holdings in a wrapped asset simply because it was convenient to mint.
Key takeaways
- A bridge usually does not move your coin; it immobilises the original and issues a claim token somewhere else.
- The wrapped asset you receive is only as sound as the reserves, code and keys standing behind it.
- Bridge exploits are common and tend to be catastrophic, so keep bridging deliberate, brief and through front-ends you already trust.
Cross-Chain Bridge — frequently asked questions
Is bridging the same as swapping on an exchange?
Not quite. A swap trades one asset for another with a counterparty or a pool, and you end up holding a different thing. A bridge aims to leave you holding the same thing on a different chain. In practice many bridges route through a swap anyway, and a centralised exchange can act as an informal bridge: deposit on one network, withdraw on another.
Why does the asset arrive under a different name?
Because it is a wrapped representation, not the native coin. Names like wrapped or bridged versions of an asset signal that the balance is a claim issued by a specific bridge, redeemable for the locked original. Two bridges can issue rival wrapped versions of the same asset, and they are not interchangeable, so check which one a platform actually accepts before you send.
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