From: Anthony Towns <aj@erisian•com.au>
To: ZmnSCPxj <ZmnSCPxj@protonmail•com>
Cc: "bitcoin-dev@lists•linuxfoundation.org"
<bitcoin-dev@lists•linuxfoundation.org>,
"lightning-dev@lists•linuxfoundation.org"
<lightning-dev@lists•linuxfoundation.org>
Subject: Re: [bitcoin-dev] [Lightning-dev] More thoughts on NOINPUT safety
Date: Fri, 22 Mar 2019 12:58:46 +1000 [thread overview]
Message-ID: <20190322025846.ltsqgknp4s7um6lg@erisian.com.au> (raw)
In-Reply-To: <ITq8Tl8XaPXWzqs0F7yY3POHtysci93evnyLteDL9bYRxjjgJbTV_d-xCn_j5AZApGqCIBQ0p6UH8S-bD_n8hm1IMYS98ukpJkO4PGDXsuQ=@protonmail.com>
On Fri, Mar 22, 2019 at 01:59:14AM +0000, ZmnSCPxj wrote:
> > If codeseparator is too scary, you could probably also just always
> > require the locktime (ie for settlmenet txs as well as update txs), ie:
> > OP_CHECKLOCKTIMEVERIFY OP_DROP
> > <muSig(A_u,B_u)> OP_CHECKDLSVERIFY <Q> OP_CHECKDLS
> > and have update txs set their timelock; and settlement txs set a absolute
> > timelock, relative timelock via sequence, and commit to the script code.
>
> I think the issue I have here is the lack of `OP_CSV` in the settlement branch.
You can enforce the relative timelock in the settlement branch simply
by refusing to sign a settlement tx that doesn't have the timelock set;
the OP_CSV is redundant.
> Consider a channel with offchain transactions update-1, settlement-1, update-2, and settlement-2.
> If update-1 is placed onchain, update-1 is also immediately spendable by settlement-1.
settlement-1 was signed by you, and when you signed it you ensured that
nsequence was set as per BIP-68, and NOINPUT sigs commit to nsequence,
so if anyone changed that after the fact the sig isn't valid. Because
BIP-68 is enforced by consensus, update-1 isn't immediately spendable
by settlement-1.
Cheers,
aj
next prev parent reply other threads:[~2019-03-22 2:58 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-13 1:41 [bitcoin-dev] " Anthony Towns
2019-03-13 6:41 ` [bitcoin-dev] [Lightning-dev] " ZmnSCPxj
2019-03-13 11:10 ` Anthony Towns
2019-03-14 5:22 ` ZmnSCPxj
2019-03-14 7:24 ` Anthony Towns
2019-03-14 7:55 ` ZmnSCPxj
2019-03-14 12:00 ` Christian Decker
2019-03-20 0:22 ` Rusty Russell
2019-03-20 3:33 ` Rusty Russell
2019-03-20 7:38 ` ZmnSCPxj
2019-03-20 8:07 ` ZmnSCPxj
2019-03-21 8:37 ` Johnson Lau
2019-03-21 9:06 ` Anthony Towns
2019-03-21 10:05 ` ZmnSCPxj
2019-03-21 11:55 ` Anthony Towns
2019-03-22 1:59 ` ZmnSCPxj
2019-03-22 2:58 ` Anthony Towns [this message]
2019-03-22 7:46 ` ZmnSCPxj
2019-03-22 4:23 ` Johnson Lau
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