Re: [bitcoin-dev] New BIP: Dealing with OP_IF and OP_NOTIF malleability in P2WSH

["Russell O'Connor" <roconnor@blockstream.io>]

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On Tue, Aug 16, 2016 at 6:30 PM, Pieter Wuille <pieter.wuille@gmail.com>
wrote:

> On Aug 17, 2016 00:23, "Russell O'Connor via bitcoin-dev" <
> bitcoin-dev@lists.linuxfoundation.org> wrote:
>
> > If one's goal is to mess with an transaction to prevent it from being
> mined, it is more effective to just not relay the transaction rather than
> to mess with the witness.  Given two transactions with the same txid and
> different witness data, miners and good nodes ought to mine/relay the
> version with the lower cost (smaller?) witness data.
>
> That implies that everyone will see both versions and be able to make that
> choice. Unfortunately, those two versions will be definition be in conflict
> with each other, and thus only one will end up paying a fee. We're can't
> relay two transactions for the price of one, or we'd expose the p2p network
> to a very cheap DDoS attack: just send increasingly small versions of the
> same transaction.
>
Can I already do something similar with replace by fee, or are there limits
on that?

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