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Date: Wed, 22 Apr 2020 16:28:13 -0400
From: "David A. Harding" <dave@dtrt.org>
To: Antoine Riard <antoine.riard@gmail.com>
Message-ID: <20200422202813.oadvvn4j3oe7geq6@ganymede>
References: <a09f5291-e7c0-0aca-6971-03ace0c38dff@mattcorallo.com>
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Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>,
lightning-dev <lightning-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] RBF Pinning with Counterparties and Competing
Interest
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On Wed, Apr 22, 2020 at 03:03:29PM -0400, Antoine Riard wrote:
> > In that case, would it be worth re-implementing something like a BIP61
> reject message but with an extension that returns the txids of any
> conflicts?
>=20
> That's an interesting idea, but an attacker can create a local conflict in
> your mempool
You don't need a mempool to send a transaction. You can just open
connections to random Bitcoin nodes directly and try sending your
transaction. That's what a lite client is going to do anyway. If the
pinned transaction is in the mempools of a significant number of Bitcoin
nodes, then it should take just a few random connections to find one of
those nodes, learn about the conflict, and download the pinned
transaction.
If that's not acceptable, you could find some other way to poll a
significant number of people with mempools, e.g. BIP35 mempool messages
or reusing the payment hash in a bunch of 1 msat probes to LN nodes who
opt-in to scanning their bitcoind's mempools for a corresponding
preimage.
-Dave
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