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ETH 桥接加密资产：并非简单的代币转移
所谓的“桥接”（Bridging）在字面上并不意味着将相同的代币从一个区块链直接移动到另一个区块链。在许多桥接架构中，原始资产会在源链上被锁定，同时在目标链上铸造出相应的包装代币或桥接代币。只有当支撑该代币的底层资产保持安全时，这个新代币才能维持 1:1 的价值锚定。
Ethereum 的官方桥接文档明确指出，这种结构引入了智能合约风险、交易对手风险以及系统性风险。那么，如果桥接协议遭到黑客攻击，会发生什么呢？
桥接代币可能失去价值支撑
想象一下，某个桥接协议在以太坊上锁定了 10,000 ETH，并在另一条区块链上发行了 10,000 个包装后的 ETH 代币。正常情况下：
10,000 个包装 ETH = 桥接准备金中的 10,000 ETH
然而，如果攻击者从桥接合约中盗取了 6,000 ETH，此时市场上仍然存在 10,000 个包装代币，但可用于赎回的 ETH 仅剩 4,000 个。这意味着该包装资产现在处于抵押不足的状态。
Market participants may immediately start selling the token at a price lower than native ETH because they are no longer confident that each token can be redeemed on a 1:1 ratio. This is similar to the case of depeg for stablecoins, except that the missing collateral lies within cross-chain infrastructure rather than in stablecoins 'reserves.
Hackers can also create tokens out of thin air
The bridging protocol does not necessarily require a direct loss of its locked reserves. Some attacks specifically utilize casting mechanisms. If an attacker can convince contracts on the target chain that the assets have been deposited (even though they have not actually been deposited), the bridging protocol may mince unsupported wrapping tokens . Chainlink describes such issues as "infinite mint" vulnerabilities: the supply of tokens increases, but reserves do not increase accordingly.
Attackers could then sell the tokens on a decentralized exchange or use them as collateral elsewhere. This makes the bridging vulnerability particularly dangerous because the damage it causes can spread to users who are not directly using the bridging service.
DeFi protocol may be next victim
Bridge assets are often deposited in lending agreements, liquidity pools, and decentralized exchanges. Suppose an unsupported wrapped token is accepted as collateral for a $1 million loan. If the price of the token suddenly collapses to near zero, the agreement will leave worthless collateral and the borrower will retain the lent assets.
This provides a path for the bridging vulnerability to spread to a DeFi system crash. This is one reason to understand the importance of DeFi's clearing mechanism: When the market loses confidence in an asset, the agreement may freeze the market, reduce the value of collateral, or quickly force liquidation.
Can bridge tokens be restored?
Sometimes. Bridging operators may replace stolen collateral, suspend casting functions, recover funds, or re-capitalize the system. If full mortgage support is restored, the wrapped tokens may gradually return to their original price anchors.
Some other bridging protocols use the Reserve Proof System (Proof-of-Reserve) to monitor whether outstanding packaging tokens are fully collateralized. These systems can be connected to circuit breakers that stop new mints or freeze affected trading markets when reserves fall below required levels.
