From: "David A. Harding" <dave@dtrt•org>
To: Bitcoin Protocol Discussion <bitcoin-dev@lists•linuxfoundation.org>
Cc: lightning-dev <lightning-dev@lists•linuxfoundation.org>
Subject: Re: [bitcoin-dev] [Lightning-dev] RBF Pinning with Counterparties and Competing Interest
Date: Fri, 19 Jun 2020 16:52:20 -0400 [thread overview]
Message-ID: <20200619205220.fshbr7pbijaerbf2@ganymede> (raw)
In-Reply-To: <20200619195846.fclw4ilngvbbf2kk@ganymede>
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On Fri, Jun 19, 2020 at 03:58:46PM -0400, David A. Harding via bitcoin-dev wrote:
> I think you're assuming here that the attacker broadcast a particular
> state.
Whoops, I managed to confuse myself despite looking at Bastien's
excellent explainer. The attacker would be broadcasting the latest
state, so the honest counterparty would only need to send one blind
child. However, the blind child will only be relayed by a Bitcoin peer
if the peer also has the parent transaction (the latest state) and, if
it has the parent transaction, you should be able to just getdata('tx',
$txid) that transaction from the peer without CPFPing anything. That
will give you the preimage and so you can immediately resolve the HTLC
with the upstream channel.
Revising my conclusion from the previous post:
I think the strongman argument for the attack would be that the attacker
will be able to perform a targeted relay of the low-feerate
preimage-containing transaction to just miners---everyone else on the
network will receive the honest user's higher-feerate expired-timelock
transaction. Unless the honest user happens to have a connection to a
miner's node, the user will neither be able to CPFP fee bump nor use
getdata to retrieve the preimage.
Sorry for the confusion.
-Dave
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next prev parent reply other threads:[~2020-06-19 20:53 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-21 2:43 [bitcoin-dev] " Matt Corallo
2020-04-22 4:12 ` [bitcoin-dev] [Lightning-dev] " ZmnSCPxj
2020-04-22 4:18 ` Olaoluwa Osuntokun
2020-04-22 6:08 ` ZmnSCPxj
2020-04-22 8:01 ` Antoine Riard
2020-04-22 8:55 ` Bastien TEINTURIER
2020-04-22 23:05 ` Olaoluwa Osuntokun
2020-04-22 23:11 ` Olaoluwa Osuntokun
2020-04-22 16:56 ` Matt Corallo
2020-04-22 4:13 ` [bitcoin-dev] " Olaoluwa Osuntokun
2020-04-22 11:51 ` David A. Harding
2020-04-27 21:26 ` Rusty Russell
2020-04-22 16:50 ` Matt Corallo
2020-04-22 23:13 ` Olaoluwa Osuntokun
2020-04-22 23:20 ` Matt Corallo
2020-04-22 23:27 ` Olaoluwa Osuntokun
2020-04-23 1:10 ` Matt Corallo
2020-04-23 4:50 ` [bitcoin-dev] [Lightning-dev] " ZmnSCPxj
2020-04-23 6:21 ` Matt Corallo
2020-04-23 12:46 ` ZmnSCPxj
2020-04-23 22:47 ` Matt Corallo
2020-06-19 7:44 ` Bastien TEINTURIER
2020-06-19 19:58 ` David A. Harding
2020-06-19 20:52 ` David A. Harding [this message]
2020-06-20 8:54 ` Bastien TEINTURIER
2020-06-20 10:36 ` David A. Harding
2020-06-20 16:01 ` ZmnSCPxj
2020-06-21 2:10 ` ZmnSCPxj
2020-06-22 7:35 ` Bastien TEINTURIER
2020-06-22 8:15 ` ZmnSCPxj
2020-06-22 8:25 ` Bastien TEINTURIER
2020-06-24 8:32 ` Matt Corallo
2020-04-23 1:18 ` [bitcoin-dev] " Jeremy
2020-04-22 18:24 ` David A. Harding
2020-04-22 19:03 ` Antoine Riard
2020-04-22 20:28 ` David A. Harding
2020-04-22 22:53 Matt Corallo
2020-04-23 9:59 ` David A. Harding
2020-04-23 12:52 ` [bitcoin-dev] [Lightning-dev] " ZmnSCPxj
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