Bridging Crypto Between Chains Without Losing It

Moving an asset from one chain to another feels like sending a transfer, and it is not one. Nothing crosses. A coin issued on one chain stays on that chain, and every bridge is a mechanism for producing something on the other side that stands in for it. What that something is, and who has to stay solvent or honest for it to keep standing in, is the entire question — and it is a custody question, not a networking one.

Three designs, three different things to own

Lock-and-mint is the most common. Your coin is locked in a contract or with a custodian on the source chain, and a representation is minted for you on the destination chain. What you now hold is a claim, and its value depends on the locked collateral still being there and still being redeemable. Burn-and-mint is used where one issuer controls the asset on both chains: the units are destroyed on one side and reissued on the other, so you hold the genuine asset rather than a wrapper, and your dependency is on the issuer rather than on a locked pool. Liquidity networks do something different again — you sell into a pool on the source chain and someone pays you out of a pool on the destination chain. You end up holding the native asset, but you have executed a trade, which means a price, a spread and slippage rather than a one-to-one transfer.

Read what you received, not what you sent

The practical consequence is that the token arriving in your wallet may not be the token you think it is. Popular assets have several wrapped versions from different bridges circulating on the same chain, each with its own contract address, its own redemption path and its own liquidity. They are not interchangeable, and a thin one can trade at a discount to the asset it represents while the underlying does nothing at all. Before you treat a balance as the asset, check the contract address against the issuer's own documentation, and check where it can be redeemed or sold. A wrapped balance nobody wants to buy is a custodial position with extra steps.

Why bridges get attacked more than anything else

Bridges concentrate the value of everything that has crossed them into a single contract or a single set of signing keys, which makes them the highest-value target per line of code in the industry. The recurring failure modes are structural rather than exotic: a validator or multisig set small enough to compromise, a flaw in how deposit messages are verified that lets an attacker forge one, and upgradeable contracts whose admin keys are themselves the weak point. Several of the largest thefts on record were bridge failures, and our incident record shows the same shapes recurring across different years and different chains. This is why bridge choice deserves the scrutiny people normally reserve for exchanges.

The checks that are worth the minute they cost

Reach the bridge through the destination chain's own documentation rather than a search result or a message, because bridge front-ends are a favourite target for lookalike domains. Prefer the canonical bridge operated by the chain itself where one exists; it is usually slower and usually the one with the most eyes on it. Send a small test amount first and complete the whole round trip, including whatever claim step the destination requires — many bridges need a second transaction on the far side, and a transfer that appears stuck is often just waiting for it. Make sure you hold the destination chain's gas token before you start, because arriving with an asset and no way to pay for a transaction is the most common self-inflicted version of a stuck bridge. And if the route is a swap rather than a mint, set a sensible slippage limit and check the quote against a second source.

The route that avoids the question

For assets listed on both chains, a centralised exchange is often the plainer path: deposit on one network, withdraw on the other, and the venue absorbs the bridging internally. You are trading one counterparty for another rather than eliminating counterparty risk, and it only works while the exchange has that network enabled for deposits and withdrawals, which changes without much notice. But for a large transfer it replaces an unaudited contract with an institution whose custody and incident history is at least documented — our graded reviews cover exactly that. It is a different risk, not no risk, and choosing between them deliberately is the point.