Historical retrospective · Layer 2
Cross-chain bridges became a central security concern
Bridges coordinate representations or messages across networks, often using validators, multisignatures, light clients or canonical rollup contracts.
Their design determines where custody and verification trust sit, making a bridge more than a simple transport link.
Major incidents pushed security review toward bridge signers, upgrade keys and message-verification logic.
A token shown on another chain may rely on a bridge claim; users should identify the exact representation and exit route.
Primary source
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