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Why Cross-Chain Bridges Remain DeFi's Most Exploited Piece of Infrastructure
Cross-chain bridges have been the target of some of crypto's largest hacks to date. The reason comes down to a structural problem that's harder to fix than a typical smart contract bug.
Cross-chain bridges — the infrastructure that lets an asset move between separate blockchains — have accounted for a disproportionate share of the largest hacks in crypto history, a pattern that has persisted across multiple protocols and years rather than being isolated to any single project's mistake.
The structural reason is straightforward: a bridge has to hold or mint assets on one side of the connection based on trusting a claim about what happened on the other side, and that trust boundary — validating cross-chain messages, often through a smaller set of validators than either underlying blockchain itself uses — has repeatedly proven to be a narrower, more exploitable target than attacking either blockchain's own core consensus directly.
This is a meaningfully different risk category from a typical single-chain DeFi exploit: a bug in one protocol's smart contract usually only puts that protocol's own funds at risk, while a bridge compromise can affect every asset that was routed through it, sometimes well after the fact, since bridged tokens continue circulating on the destination chain even once the underlying collateral on the source chain has already been drained.
None of this is a reason to avoid cross-chain activity entirely, but it's a genuine, structural risk factor worth weighing specifically — separate from a token's own price risk — before moving meaningful value across a bridge, and it's exactly the kind of infrastructure-level thinking worth building on Trade2Spike's Historical Market Replay before it's a real decision with real funds in transit.