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Subject: Re: [bitcoindev] Call for reconfiguration of nodes to relay
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Hi Greg,
On 2025-01-31 08:43, Greg Tonoski wrote:
> I agree that -incrementalrelayfee=0 (or whatever suits a node runner)
> would logically supplement the minrelaytxfee=0.00000001.
Setting `incrementalrelayfee` to zero would mean that you allow the
replacement of an original transaction without increasing the total fees
in the mempool. A malicious actor could trivially exploit this setting
by cycling two conflicting transactions A and A' with the same weight
and same fee to waste bandwidth and CPU cycles across the nodes that
follow your advice.
On 2025-01-31 08:43, Greg Tonoski wrote:
> I suppose that miners already use -blockmintxfee=0 or anything lower
> than the default value because there are transactions with fees as low
> as 0 (zero) in the blocks.
Do you have any evidence for this claim? The prior times that I
investigated this claim, transactions with feerates lower than
`minTxRelayFee` exclusively appeared at the front of the block,
indicating that they were explicitly prioritized by the miner, probably
due to out-of-band payment. You may now also find some TRUC transactions
where a low-feerate parent is carried by a higher feerate child. Neither
of these two indicates that a miner has configured a lower `-blockmintxfee`.
You could convince me that a miner has configured a lower
`-blockmintxfee` by showing us a block that includes transactions with
feerates below `minTxRelayFee` appearing in the organic descending
feerate order.
On 2025-01-31 08:43, Greg Tonoski wrote:
> I can't see how minrelaytxfee=0.00000001 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.
Unfortunately, not knowing about an exploit falls short of proving
something secure.
Murch
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