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From: ZmnSCPxj <ZmnSCPxj@protonmail.com>
To: Antoine Riard <antoine.riard@gmail.com>
Cc: Bitcoin Protocol Discussion
	<bitcoin-dev@lists.linuxfoundation.org>,
	"lightning-dev\\\\\\\\@lists.linuxfoundation.org"
	<lightning-dev@lists.linuxfoundation.org>,
	security@ariard.me
Subject: Re: [bitcoin-dev] [Lightning-dev] OP_Expire and Coinbase-Like Behavior: Making HTLCs Safer by Letting Transactions Expire Safely
Date: Tue, 07 Nov 2023 11:11:59 +0000	[thread overview]
Message-ID: <iBopsZOx5TRDjjfxSLo9GLa00c7Jk0uMSae6_EPsPjnd10Aa87-lxVIZnL37GwEM3ppemBAxCwkv7r4w5AfDjLkKo0OhIpdB0jK0_OTRqf4=@protonmail.com> (raw)
In-Reply-To: <CALZpt+GXGBbo0JjOyMr3B-3dVY2Q_DuzF6Sn3xE5W24x77PRYg@mail.gmail.com>

Good morning Antoine,


> Once the HTLC is committed on the Bob-Caroll link, Caroll releases the preimage off-chain to Bob with an `update_fulfill_htlc` message, though Bob does _not_ send back his signature for the updated channel state.
> 
> Some blocks before 100, Caroll goes on-chain to claim the inbound HTLC output with the preimage. Her commitment transaction propagation in network mempools is systematically "replaced cycled out" by Bob.

I think this is impossible?

In this scenario, there is an HTLC offered by Bob to Carol.

Prior to block 100, only Carol can actually create an HTLC-success transaction.
Bob cannot propagate an HTLC-timeout transaction because the HTLC timelock says "wait till block 100".

Neither can Bob replace-recycle out the commitment transaction itself, because the commitment transaction is a single-input transaction, whose sole input requires a signature from Bob and a signature from Carol --- obviously Carol will not cooperate on an attack on herself.

So as long as Carol is able to get the HTLC-success transaction confirmed before block 100, Bob cannot attack.
Of course, once block 100 is reached, `OP_EXPIRE` will then mean that Carol cannot claim the fund anymore.

Regards,
ZmnSCPxj


  reply	other threads:[~2023-11-07 11:12 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-10-16 16:57 [bitcoin-dev] Full Disclosure: CVE-2023-40231 / CVE-2023-40232 / CVE-2023-40233 / CVE-2023-40234 "All your mempool are belong to us" Antoine Riard
2023-10-16 19:13 ` Peter Todd
2023-10-16 22:10   ` Matt Morehouse
2023-10-17  1:11   ` Antoine Riard
2023-10-20 10:47     ` Peter Todd
2023-10-20 11:18       ` Jochen Hoenicke
2023-10-16 22:51 ` Olaoluwa Osuntokun
2023-10-17  7:21 ` [bitcoin-dev] [Lightning-dev] " ziggie1984
2023-10-17 10:34   ` ZmnSCPxj
2023-10-17 18:34     ` Antoine Riard
2023-10-20 10:31     ` Peter Todd
2023-10-20 11:03       ` Peter Todd
2023-10-20 18:35         ` Matt Morehouse
2023-10-20 21:05           ` Matt Corallo
2023-10-21  0:15             ` Peter Todd
2023-10-21  1:03               ` Matt Corallo
2023-10-21  1:25                 ` Peter Todd
2023-10-21  1:55                   ` Matt Corallo
2023-10-21  2:43                     ` Peter Todd
2023-10-23 16:09                       ` Matt Corallo
2023-10-17 17:47   ` Antoine Riard
2023-10-17 18:47     ` Antoine Riard
2023-10-18  0:17 ` Matt Corallo
2023-10-18  2:57   ` Antoine Riard
2023-10-19  8:12     ` Bastien TEINTURIER
2023-10-19 16:23   ` Matt Morehouse
2023-10-19 17:22     ` Antoine Riard
2023-10-19 17:53       ` Matt Morehouse
2023-10-19 19:33         ` Antoine Riard
2023-10-21  0:18           ` Olaoluwa Osuntokun
2023-11-17 22:36             ` Antoine Riard
2023-10-19 18:02     ` Matt Corallo
2023-10-20  6:56 ` [bitcoin-dev] " Antoine Riard
2023-10-21 20:05   ` Antoine Riard
2023-10-27  0:43     ` Peter Todd
2023-11-02  4:46     ` Antoine Riard
2023-10-21  0:09 ` [bitcoin-dev] OP_Expire and Coinbase-Like Behavior: Making HTLCs Safer by Letting Transactions Expire Safely Peter Todd
2023-10-21  8:58   ` David A. Harding
2023-10-21 10:31     ` Peter Todd
2023-10-22  8:30   ` vjudeu
2023-10-23 11:10   ` [bitcoin-dev] [Lightning-dev] " ZmnSCPxj
2023-10-23 15:45     ` Peter Todd
2023-11-02  5:24   ` [bitcoin-dev] " Antoine Riard
2023-11-02  6:26     ` Peter Todd
2023-11-02 17:07       ` Matt Morehouse
2023-11-03  5:27         ` Antoine Riard
2023-11-03  5:25       ` Antoine Riard
2023-11-04  7:26         ` Peter Todd
2023-11-06 18:45           ` Antoine Riard
2023-11-07 11:11             ` ZmnSCPxj [this message]
2023-11-07 15:44               ` [bitcoin-dev] [Lightning-dev] " Antoine Riard
2023-11-08  0:51             ` [bitcoin-dev] " Peter Todd
2023-11-08  2:06               ` Peter Todd
2023-11-13  2:18                 ` Antoine Riard
2023-11-14 19:50                   ` Peter Todd
     [not found]                     ` <CALZpt+H38cU9L8kq0mSYCDirzL39fxhdoz4pAPiS8dGJP8akKg@mail.gmail.com>
2023-11-15 17:53                       ` [bitcoin-dev] Fwd: " Antoine Riard
2023-10-22  4:49 ` [bitcoin-dev] Full Disclosure: CVE-2023-40231 / CVE-2023-40232 / CVE-2023-40233 / CVE-2023-40234 "All your mempool are belong to us" Nadav Ivgi
2023-10-23  8:49   ` David A. Harding

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