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authorPeter Todd <pete@petertodd.org>2022-11-02 10:33:51 -0400
committerbitcoindev <bitcoindev@gnusha.org>2022-11-02 14:34:00 +0000
commited0ece04d754ae34c89c0ef16e85b5590cc563cf (patch)
tree71fceced7ccfe96855f70db04b0341f7baa84d6e
parent928db78057825a88317e1d6311dc377ca423ad9f (diff)
downloadpi-bitcoindev-ed0ece04d754ae34c89c0ef16e85b5590cc563cf.tar.gz
pi-bitcoindev-ed0ece04d754ae34c89c0ef16e85b5590cc563cf.zip
Re: [bitcoin-dev] Solving Multi-Party Flows Pinning with Opt-in Full-RBF Spent-nVersion Signaling
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+Date: Wed, 2 Nov 2022 10:33:51 -0400
+From: Peter Todd <pete@petertodd.org>
+To: Greg Sanders <gsanders87@gmail.com>
+Message-ID: <Y2J/zyeTh/rwekqe@petertodd.org>
+References: <CALZpt+GZAd-vYMzUMicg0c9OyyWExtT5EH61Hms6NNOM19ddZA@mail.gmail.com>
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+Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
+Subject: Re: [bitcoin-dev] Solving Multi-Party Flows Pinning with Opt-in
+ Full-RBF Spent-nVersion Signaling
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+On Wed, Nov 02, 2022 at 10:19:00AM -0400, Greg Sanders wrote:
+> Sorry, I forgot one point which is pertinent to this conversation.
+>=20
+> *Even with* fullrbf-everywhere and V3, pinning via rule#3 and rule#5 are
+> still an issue in coinjoin scenarios.
+>=20
+> Each coinjoin adversary can double-spend their coin to either full package
+> weight(101kvb),
+> or give 24 descendants, which means you quickly pay out the nose in rule#3
+
+=2E..and the attacker also pays out the nose if they're exploiting rule #3.
+
+> or are excluded
+> from RBFing it if you have 4+ greifers in your coinjoin violating rule#5.
+>=20
+> If we instead narrowed this policy to marking a transaction output as
+> opt-in to V3, it gets a bit more interesting. *Unfortunately,
+> double-spending counterparties can still cause rule#3 pain, one 100kvb
+> package of junk per peer,* but rule#5 violations is at least contained to
+> coinjoins with ~50 peers(assuming two transactions booted per input
+> double-spent, which would be the V3 max bumped per input).
+
+There's no hard technical reason for rule #5 to even exist. It's simply a
+conservative DoS limit to avoid having to do "too much" computation when
+processing a replacement in some replacement implementations. We shouldn't
+assume it will always exist. And like rule #3 pinning, exploiting it costs
+money.
+
+--=20
+https://petertodd.org 'peter'[:-1]@petertodd.org
+
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