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Subject: [bitcoin-dev] Denial of Service using Package Relay
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Hi Bitcoin Developers,
I think its possible to use [package relay][0] for DoS attack in coinjoin. =
A few other projects could also be affected by packages. Since its a propos=
al that adds new P2P messages, transaction relay etc. its as important as a=
ny soft fork. Let me know if I am missing something.
Consider there are 2 coinjoin implementations: A and B
1) Register input in A
2) Double spend same input with zero fee to your own address
3) Register unconfirmed UTXO from 2 in B
4) B relays a package in which coinjoin transaction (child) pays for 2 (par=
ent)
Users and coinjoin implementation B, both are incentivized to attack in thi=
s case.
Attacker could also use a different approach and register same input in A, =
B although there are some tradeoffs:
- If input gets included in a coinjoin transaction broadcasted by A, there =
is nothing much B can do about it. RBF with multiple users isn't easy and c=
ostly.
- Implementation with less users participating in a round would have an adv=
antage.
[0]: https://gist.github.com/sdaftuar/8756699bfcad4d3806ba9f3396d4e66a
/dev/fd0
floppy disk guy
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