Re: [bitcoin-dev] Announcement: Full-RBF Miner Bounty

From: El_Hoy <eloyesp@gmail•com>
To: Bitcoin Protocol Discussion <bitcoin-dev@lists•linuxfoundation.org>
Cc: Daniel Lipshitz <daniel@gap600•com>
Subject: Re: [bitcoin-dev] Announcement: Full-RBF Miner Bounty
Date: Mon, 5 Dec 2022 09:20:58 -0300	[thread overview]
Message-ID: <CAPapNH3NEBP2-GVZZ_75K-QU0psGdAHyjdAus-vfq-0jffTstg@mail.gmail.com> (raw)
In-Reply-To: <Y3OljVGQbZ/Wj8T6@petertodd.org>

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The only option I see against the attack Peter Todd is doing to opt-in RBF
and 0Conf bitcoin usage is working on a bitcoin core implementation that
stops propagation of full-rbf replaced blocks. Running multiple of such
nodes on the network will add a risk to miners that enable full-rbf that
would work as an incentive against that.

Obviously that would require adding an option on bitcoin core (that is not
technically but politically difficult to implement as Petter Todd already
have commit access to the main repository).

That said, a sufficiently incentivized actor (like Daniel Lipshitz or Muun
wallet developers) could work on a fork and run several nodes with such
functionality. As far as I understand the percolation model, with 10 to 20
nodes running such a rule would create a significant risk for full-rbf
miners.

Regards.

---  Eloy

On Tue, Nov 15, 2022 at 11:43 AM Peter Todd via bitcoin-dev <
bitcoin-dev@lists•linuxfoundation.org> wrote:

> On Tue, Nov 15, 2022 at 03:36:08PM +1000, Anthony Towns via bitcoin-dev
> wrote:
> > On Tue, Nov 08, 2022 at 01:16:13PM -0500, Peter Todd via bitcoin-dev
> wrote:
> > > FYI I've gotten a few hundred dollars worth of donations to this
> effort, and
> > > have raised the reward to about 0.02 BTC, or $400 USD at current
> prices.
> >
> > Seems like this has been mostly claimed (0.014btc / $235, 9238sat/vb):
>
> I'm turning it back on when (if) the mempool settles down. I've got more
> than
> enough donations to give another run at it (the majority was donated
> privately
> FWIW). There's a risk of the mempool filling up again of course; hard to
> avoid
> that.
>
> Right now of course it's really easy to double spend with the obvious
> low-fee/high-fee method as the min relay fee keeps shifting.
>
> >
> https://mempool.space/tx/397dcbe4e95ec40616e3dfc4ff8ffa158d2e72020b7d11fc2be29d934d69138c
> >
> > The block it was claimed in seems to have been about an hour after the
> > default mempool filled up:
> >
> > https://twitter.com/murchandamus/status/1592274621977477120
> >
> > That block actually seems to have included two
> > alice.btc.calendar.opentimestamps.org txs, the other paying $7.88
> > (309sat/vb):
> >
> >
> https://mempool.space/tx/ba9670109a6551458d5e1e23600c7bf2dc094894abdf59fe7aa020ccfead07cf
>
> The second is because I turned down the full-rbf reward to more normal fee
> levels. There's also another full-rbf double-spend from the Bob calendar,
> along
> the same lines:
> 7e76b351009326a574f3120164dbbe6d85e07e04a7bbdc40f0277fcb008d2cd2
>
> I double-spent the txin of the high fee tx that got mined. But I
> mistakenly had
> RBF enabled in that double-spend, so while it propagated initially, I
> believe
> it was replaced when something (someone?) rebroadcast the high-fee 397dcb
> tx.
>
> > Timeline (utc) to me looks like:
> >
> >  - 13:12 - block 763148 is mined: last one that had a min fee < 1.5sat/vb
> >  - 13:33 -
> f503868c64d454c472859b793f3ee7cdc8f519c64f8b1748d8040cd8ce6dc6e1
> >            is announced and propogates widely (1.2sat/vb)
> >  - 18:42 -
> 746daab9bcc331be313818658b4a502bb4f3370a691fd90015fabcd7759e0944
> >            is announced and propogates widely (1.2sat/vb)
> >  - 21:52 - ba967010 tx is announced and propogates widely, since
> >            conflicting tx 746daab9 has been removed from default
> >          mempools
> >  - 21:53 - murch tweets about default mempool filling up
> >  - 22:03 - 397dcbe4 tx is announced and propogates widely, since
> >            conflicting tx f503868 has already been removed from default
> >          mempools
>
> Is that 22:03 time for 397 from your node's logs? It was originally
> announced
> hours earlier. From one of my full-rbf nodes:
>
>     2022-11-14T14:08:37Z [mempool] replacing tx
> 764867062b67fea61810c3858d587da83a28290545e882935a32285028084317 with
> 397dcbe4e95ec40616e3dfc4ff8ffa158d2e72020b7d11fc2be29d934d69138c for
> 0.00468 additional fees, -1 delta bytes
>
> >  - 22:35 - block 763189 is mined
> >  - 22:39 - block 763190 is mined
> >  - 23:11 - block 763191 is mined
> >  - 23:17 - block 763192 is mined including 397dcbe4
> >
> > miningpool.observer reports both 397dcbe4 and ba967010 as missing in the
> > first three blocks, and gives similar mempool ages for those txs to what
> > my logs report:
> >
> >
> https://miningpool.observer/template-and-block/0000000000000000000436aba59d8430061e0e50592215f7f263bfb1073ccac7
> >
> https://miningpool.observer/template-and-block/00000000000000000005600404792bacfd8a164d2fe9843766afb2bfbd937309
> >
> https://miningpool.observer/template-and-block/00000000000000000004a3073f58c9eae40f251ea7aeaeac870daeac4b238fd1
> >
> > That presumably means those pools (AntPool twice and "unknown") are
> > running with large mempools that didn't kept the earlier 1.2sat/vb txs.
>
> To be clear, you think that AntPool and that other exchange is running
> with a
> larger than normal max mempool size limit? You mean those miners *did*
> keep the
> earlier 1.2sat/vb tx?
>
> > The txs were mined by Foundry:
> >
> >
> https://miningpool.observer/template-and-block/00000000000000000001382a226aedac822de80309cca2bf1253b35d4f8144f5
> >
> > This seems to be pretty good evidence that we currently don't have any
> > significant hashrate mining with fullrbf policies (<0.5% if there was a
> > high fee replacement available prior to every block having been mined),
> > despite the bounty having been collected.
>
> Oh, we can put much lower bounds on that. I've been running OTS calendars
> with
> full-rbf replacements for a few months without clear evidence of a full-rbf
> replacement.  While there was good reason to think some miners were mining
> full-rbf before a few years back, they probably didn't bother to reapply
> their
> patches each upgrade. `mempoolfullrbf=1` is much simpler to use.
>
> --
> https://petertodd.org 'peter'[:-1]@petertodd.org
> _______________________________________________
> bitcoin-dev mailing list
> bitcoin-dev@lists•linuxfoundation.org
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>

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