Cross-Chain Bridge
A protocol that moves cryptocurrency between different blockchains. Bridges have been among the most heavily exploited targets in DeFi history.
Also known as: blockchain bridge, token bridge, wrapped token bridge
Last reviewed: 10 June 2026
A cross-chain bridge works by locking tokens on the source chain and minting equivalent wrapped tokens on the destination chain, or by maintaining reserves on both sides. This unlocks interoperability but concentrates enormous value in a single smart contract, making bridges prime targets for hackers.
Scam and fraud dimensions of bridges include: fake bridge websites that mimic legitimate protocols and steal funds at the point of connection; bridge exploits that empty user deposits through smart-contract vulnerabilities; and romance/pig-butchering scams that direct victims to a fraudulent bridge to "move funds" as a precursor to draining them.
Users should only interact with bridges through verified official URLs, bookmark them directly rather than searching, and be wary of any bridge discovered via social media or messaging apps. For large transfers, testing with a small amount first is prudent.
Examples
- A romance scammer instructs their target to use a "partner bridge" to consolidate funds, which is a fraudulent site that sends tokens directly to the attacker's wallet.