From: Peter Todd <pete@petertodd•org>
To: email@yancy•lol,
Bitcoin Protocol Discussion
<bitcoin-dev@lists•linuxfoundation.org>,
yancy via bitcoin-dev <bitcoin-dev@lists•linuxfoundation.org>,
Anthony Towns <aj@erisian•com.au>
Subject: Re: [bitcoin-dev] On mempool policy consistency
Date: Mon, 07 Nov 2022 10:32:17 -0400 [thread overview]
Message-ID: <0A6B5781-EBC6-4D98-8AE8-43436B5F73EA@petertodd.org> (raw)
In-Reply-To: <16eb6a50691ccc661310051de6b8e2c0@yancy.lol>
On November 3, 2022 5:06:52 PM AST, yancy via bitcoin-dev <bitcoin-dev@lists•linuxfoundation.org> wrote:
>
>AJ/Antoine et al
>
>> What should folks wanting to do coinjoins/dualfunding/dlcs/etc do to
>> solve that problem if they have only opt-in RBF available?
>
>Assuming Alice is a well funded advisory, with enough resources to spam the network so that enough nodes see her malicious transaction first, how does full-rbf solve this vs. opt-in rbf?
First of all, to make things clear, remember that the attacks were talking about are aimed at _preventing_ a transaction from getting mined. Alice wants to cheaply broadcast something with low fees that won't get mined soon (if ever), that prevents a protocol from making forward progress.
With full-rbf, who saw what transaction first doesn't matter: the higher fee paying transaction will always(*) replace the lower fee one. With opt-in RBF, spamming the network can beat out the alternative.
*) So what's the catch? Well, due to limitations in today's mempool implementation, sometimes we can't fully evaluate which tx pays the higher fee. For example, if Alice spams the network with very _large_ numbers transactions spending that input, the current mempool code doesn't even try to figure out if a replacement is better.
But those limitations are likely to be fixable. And even right now, without fixing them, Alice still has to use a lot more money to pull off these attacks with full-rbf. So full-rbf definitely improves the situation even if it doesn't solve the problem completely.
next prev parent reply other threads:[~2022-11-07 14:32 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-03 21:06 email
2022-11-07 14:32 ` Peter Todd [this message]
2022-11-07 14:47 ` Erik Aronesty
2022-11-08 14:54 ` email
2022-11-09 12:05 ` email
[not found] <mailman.38435.1666828344.956.bitcoin-dev@lists.linuxfoundation.org>
2022-10-27 9:56 ` John Carvalho
2022-10-27 17:21 ` Anthony Towns
2022-10-27 17:35 ` Suhas Daftuar
2022-10-27 17:44 ` Greg Sanders
2022-10-27 19:00 ` Greg Sanders
2022-11-08 9:28 ` AdamISZ
2022-11-10 14:38 ` email
-- strict thread matches above, loose matches on Subject: below --
2022-10-26 23:52 Anthony Towns
2022-10-27 12:36 ` Gloria Zhao
2022-10-27 15:37 ` Anthony Towns
2022-10-27 18:17 ` Luke Dashjr
2022-10-27 13:49 ` Greg Sanders
2022-10-27 15:00 ` Peter Todd
2022-10-27 20:29 ` Antoine Riard
2022-10-30 2:24 ` Anthony Towns
2022-10-29 7:45 ` David A. Harding
2022-10-30 1:02 ` Anthony Towns
2022-10-30 2:40 ` Anthony Towns
2022-10-30 11:06 ` email
2022-10-31 13:02 ` Suhas Daftuar
2022-10-31 16:25 ` Greg Sanders
2022-10-31 17:21 ` email
2022-10-31 17:51 ` Peter Todd
2022-11-04 10:28 ` email
2022-11-02 3:07 ` Anthony Towns
2022-11-02 13:32 ` Greg Sanders
2022-11-02 19:50 ` Antoine Riard
2022-11-05 2:35 ` Peter Todd
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