It's been two days, and the situation regarding the theft on Bybit is still unclear.

Let me share my thoughts, as I have encountered a multi-signature theft before and requested help (which was eventually resolved):

Right now, do not doubt the security of the safe, nor should you question the security of the Ethereum underlying layer or smart contracts, and do not investigate how the signature content was replaced.

In fact, this transaction was initially an upgrade of the contract, not a transfer. The issue lies with the person who created this transaction. The subsequent participants trusted the first person too much and did not check carefully, or the first person who created the transaction employed a "man-in-the-middle" attack. The UI presented to the other two participants for signing was correct, but what was on-chain was not.

So, either the first person did this intentionally, or their device was indeed compromised.

This is the only possibility for the theft on Bybit.

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