From: ZmnSCPxj <ZmnSCPxj@protonmail•com>
To: Anthony Towns <aj@erisian•com.au>
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: Thu, 21 Mar 2019 10:05:09 +0000 [thread overview]
Message-ID: <5v4CPrMXyoMw0i1WtYYuIa_rMgkpq5NpnDhTNqTTZtfKKnFtwrbEGJnTD8ul71EM-MNpuo1R4znv4tPpwwm3Ys3m2Dbm3xsOGi96NYE9qfU=@protonmail.com> (raw)
In-Reply-To: <20190321090614.7ir64g2ehn3pz2cb@erisian.com.au>
Good morning aj,
> > Then each update transaction pays out to:
> > OP_IF
> > <csv_delta> OP_CSV OP_DROP
> > <muSig(A_si,B_si)> OP_CHECKSIGVERIFY <Q> OP_CHECKSIG
> > OP_ELSE
> > <i> OP_CHECKLOCKTIMEVERIFY OP_DROP
> > <muSig(A_u,B_u)> OP_CHECKSIGVERIFY <Q> OP_CHECKSIG
> > OP_ENDIF
>
> Yeah.
>
> I think we could potentially make that shorter still:
>
> IF OP_CODESEPARATOR <i> OP_CHECKLOCKTIMEVERIFY OP_DROP ENDIF
> <muSig(A_u,B_u)> OP_CHECKDLSVERIFY <Q> OP_CHECKDLS
>
> Signing with NOINPUT,NOSCRIPT and codeseparatorpos=1 enforces CLTV
> and allows binding to any prior update tx -- so works for an update tx
> spending previous update txs; while signing with codeseparatorpos=-1
> and NOINPUT but committing to the script code and nSequence (for the
> CSV delay) allows binding to only that update tx -- so works for the
> settlement tx. That's two pubkeys, two sigs, and the taproot point
> reveal.
Actually, the shared keys are different in the two branches above.
The "update" branch (which has no `OP_CSV`) uses the same constant `A_u` and `B_u` points.
The "state commit" branch (which has `OP_CSV`) uses different `A_si` and `B_si` points depending on `i` (state/sequence number).
Also, I cannot understand `OP_CODESEPARATOR`, please no.
Regards,
ZmnSCPxj
next prev parent reply other threads:[~2019-03-21 10:05 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 [this message]
2019-03-21 11:55 ` Anthony Towns
2019-03-22 1:59 ` ZmnSCPxj
2019-03-22 2:58 ` Anthony Towns
2019-03-22 7:46 ` ZmnSCPxj
2019-03-22 4:23 ` Johnson Lau
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