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Bridge hack
A bridge hack is the theft of funds from a cross-chain bridge, the system that moves tokens between blockchains by locking them on one chain and issuing a stand-in on another. Bridges pool large deposits in one place, so a single stolen key or contract bug can empty them.
What it means for you. If you hold a bridged or wrapped token, its value depends on the bridge still holding the original coins. If those are stolen, your stand-in token can lose its backing even though it never left your wallet. You can check which bridge issued a token, how many signers control it, whether its contracts were audited and whether upgrades pass through a timelock.
Sources: ethereum.org: Introduction to blockchain bridges, ethereum.org developer docs: Bridges, SoK: Cross-Chain Bridging Architectural Design Flaws and Mitigations (arXiv) · checked 4 October 2026
Bridge
A bridge is a service that moves tokens or information from one blockchain to another. Usually it locks your tokens on the first chain and issues a matching wrapped token on the second, which can be redeemed back through the bridge.
What it means for you. The wrapped token you receive is only worth what the bridge can redeem, so a bridge hack or bug can leave it unbacked; very large sums have been stolen this way. Some bridges are run by a small group of operators who could block or take funds. Check that the destination chain and token address are correct before sending.
Sources: ethereum.org: Blockchain bridges, ECB Macroprudential Bulletin: Decentralised finance, ethereum.org: Bridges (developer docs) · checked 4 October 2026