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sircalvin

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could it be, that the actual hack is the following:

A sends money to B

fee goes to C

you can aim the fee going to C by only sharing the transaction with C and just wait till C gets the block

So far just creative way to send money from A to C - but what if B says the cover the fee (or just implemented it that way) - then B would provide a service/money to A thinking it got the amount from the fee.

I'm however not aware of a B that is sensitive to this kind of attack - but there might be a smart contract out there...