Historical retrospective · Security
The Poly Network exploit exposed cross-chain message risks
In August 2021 Poly Network reported an exploit affecting assets across multiple chains, with the incident centered on how cross-chain messages and privileged keys were validated.
The case drew attention to bridges as complex systems that connect distinct consensus environments.
It demonstrated that multi-chain functionality creates security boundaries that users may not see from a simple transfer screen.
A bridge’s security depends on verification logic, key control and the economics of its validator set—not just the connected chains.
Primary source
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