What is a cross-chain bridge?
A cross-chain bridge (also called a crypto bridge or blockchain bridge) is a protocol that lets you send an asset from a source chain and receive an asset of equal value on a destination chain. Sometimes you receive the same asset (USDC on Ethereum → USDC on Solana); sometimes a different one (BTC → ETH), in which case the bridge is also a cross-chain swap.
What you receive is either the destination chain’s native asset or a wrapped token that represents the original. Native is simpler: nothing depends on a wrapper staying solvent.
The four main bridge designs
Lock-and-mint: the bridge locks your coins in a contract or vault on the source chain and mints a wrapped version on the destination. Simple, but every wrapped token is only as safe as the locked vault — the pattern behind most large bridge hacks.
Burn-and-mint: an issuer burns the token on one chain and mints it on another, as Circle does for USDC with its Cross-Chain Transfer Protocol. Only possible for tokens whose issuer supports it.
Liquidity networks and intents: market makers or “solvers” hold inventory on many chains. You deposit on the source chain and a solver pays you from its own balance on the destination, then settles later. Across, deBridge’s DLN and NEAR Intents work this way. Fast, and you receive native assets.
Native cross-chain AMMs: a validator network holds pooled native assets on each chain and swaps between them, e.g. Chainflip and THORChain. They can move native BTC without any wrapped token.
Bridge hacks and what they teach
Bridges hold large pools of assets, which makes them targets. The best-known incidents include Ronin (March 2022, about $625 million, compromised validator keys), Wormhole (February 2022, about $325 million, a signature-verification bug), Nomad (August 2022, about $190 million, a faulty contract upgrade) and Harmony’s Horizon bridge (June 2022, about $100 million, compromised multisig keys).
The lessons: prefer designs where funds sit in custody for as short a time as possible, avoid holding wrapped assets longer than you need to, and be wary of bridges secured by a handful of keys. No bridge is risk-free; you are choosing which risk to take.
Well-known cross-chain bridges compared
Across — intent-based bridge focused on Ethereum and its layer 2s (Arbitrum, Base, Optimism and others). Relayers front your funds on the destination and are repaid after verification; transfers usually take seconds to a minute.
Stargate — liquidity-pool bridge built on LayerZero messaging, used mainly for stablecoins and ETH across EVM chains.
Wormhole (Portal) — a messaging network with a guardian set that verifies transfers; widely used between Solana and EVM chains. Tokens often arrive as wrapped versions.
deBridge — cross-chain trading via its DLN order book, where takers fill orders on the destination chain; covers EVM chains and Solana.
Chainflip — a validator-run cross-chain AMM for native BTC, ETH, SOL, Arbitrum assets and stablecoins; no wrapped tokens.
NEAR Intents — solvers compete to fill your swap across 20+ chains, including Bitcoin, Ethereum, Solana, Tron, Dogecoin and Zcash.
THORChain — the original native cross-chain AMM, secured by RUNE-bonded nodes; strong for native BTC and large swaps.
- Moving between Ethereum L2s: intent bridges such as Across are usually fastest
- Moving native BTC: Chainflip, THORChain or NEAR Intents, which avoid wrapped BTC
- Moving USDC: issuer-native burn-and-mint (CCTP) or an aggregator that compares routes
- Moving between very different chains (e.g. Tron → Solana): an aggregator that checks several protocols at once
How to choose a bridge for a transfer
Compare the amount you receive after all fees, not the advertised rate. Check how long funds are held in custody and by whom, whether you receive a native or wrapped asset, what happens if the transfer fails, and whether the bridge needs a wallet connection or accepts a plain deposit.
A bridge aggregator does this comparison for you: it requests quotes from several protocols at once and ranks them. TorrentSwap is one — it names the protocol behind every route (Chainflip, NEAR Intents, Flashnet), includes all fees in each amount and requires no account. For a live snapshot of what each protocol pays out on popular routes, see the bridge fee comparison at torrentswap.com/bridge-fees.
How to bridge crypto, step by step
1. Decide what you are sending and what you want to receive, including both networks (for example USDT on Tron → USDC on Solana).
2. Get quotes and compare the amount received, time and custody model.
3. Enter the receiving address on the destination network and a refund address on the source network, checking both carefully.
4. Send the exact amount shown, once, and keep the tracking page open until the funds arrive.