[sircalvin]

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...

[okl]

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

If that's technically possible then that seems to be an easy way to launder money. You should probably split up your transaction and send your coins in a circle to obfuscate it.

[sircalvin]

the money launder does not make sense to me - everybody knows who mined the block and everybody knows where the fee goes... So it is perhaps not tracked by current systems but it can be tracked.

[geoah]

I guess a miner can just create a tx locally with the fees, not broadcast it to others, and then keep trying to mine a block with that tx included.