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# System prepended metadata

title: Ethereum Protocol Fellowship 15th week update

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# Ethereum Protocol Fellowship 15th week update


After the discussion with mentor Marius, we agree that the modified version is working well on the ED1,2,4, but may cause the txpool to be flooded with underpriced transactions as they can not be replaced if a future transaction exists.
So the new version contains the defense of two attacks:
- future transaction evicting a pending transaction
- a transaction overspending the funds of a sender

Here is the merge request on go-ethereum mempool we just pushed.
https://github.com/ethereum/go-ethereum/pull/26648

