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From: Greg Tonoski <gregtonoski@gmail.com>
Date: Fri, 31 Jan 2025 14:43:05 +0100
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Subject: Re: [bitcoindev] Call for reconfiguration of nodes to relay
transactions with fee-rates below 1 sat/vbyte
To: Sjors Provoost <sjors@sprovoost.nl>
Cc: Bitcoin Development Mailing List <bitcoindev@googlegroups.com>
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I agree that -incrementalrelayfee=3D0 (or whatever suits a node runner)
would logically supplement the minrelaytxfee=3D0.00000001.
I suppose that miners already use -blockmintxfee=3D0 or anything lower
than the default value because there are transactions with fees as low
as 0 (zero) in the blocks.
I can't see how minrelaytxfee=3D0.00000001 could increase risk of DoS
attack or make it significantly cheaper or more effective. There are
the default 300MB size limit for mempool and 336 hours timeout for
unconfirmed txs. They limit impact of a low fee-rate txs DoS attack
making it ineffective.
On Fri, Jan 31, 2025 at 1:59=E2=80=AFPM Sjors Provoost <sjors@sprovoost.nl>=
wrote:
>
> If you want to go this route, you may also want to set -incrementalrelayf=
ee. That way you can bump 0.001 =E1=B9=A9/vB to 0.002 =E1=B9=A9/vB, otherwi=
se you'll have to go straight to 1.001 =E1=B9=A9/vB.
>
> In addition, you would need to convince at least one miner to configure a=
matching -blockmintxfee, otherwise these low fee transactions remain stuck=
in your mempool until expiration (or CPFP).
>
> Some background: https://bitcoin.stackexchange.com/a/120782/4948
>
> A downside to consider is that it makes any potential mempool DoS attack =
1000x cheaper*, but I don't know if there are any to worry about.
>
> Comparison with historical minimum fee rates can be tricky, especially be=
cause the lightning network wasn't around yet. There's now an increased inc=
entive to knock out a full node if it's connected to a lightning node. So e=
ven if there's no vulnerability to attack today, it's probably good to keep=
fees somewhat high to ensure new attacks are expensive.
>
> - Sjors
>
> * =3D assuming the attack scales linear with the amount of transaction da=
ta, and not e.g. quadratic or exponential
>
> > Op 31 jan 2025, om 09:49 heeft Greg Tonoski <gregtonoski@gmail.com> het=
volgende geschreven:
> >
> > The minrelaytxfee default value of 1000/kvB (1 sat/vbyte) has been set
> > in Bitcoin nodes since 2013 or earlier. In 2013, 1000 sats were priced
> > at $0.01, today it is about 100 times more. Wouldn't you like to
> > consider adjusting your node configuration and lower the hurdle,
> > perhaps? I would suggest setting minrelaytxfee=3D0.00000001 (which
> > translates to 0.001 sat/vbyte) as a rule of thumb. The value could be
> > set in a bitcoin.conf file. There is negligible number of such
> > reconfigured nodes relaying transactions with fee-rates below 1
> > sat/vbyte currently.
> >
> > There is the intention to unblock transactions with fee-rate below 1
> > sat/vbyte in Bitcoin. Probably consolidation and multisig types of
> > transactions would benefit the most.
>
> --
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